Idaho National Laboratory

Idaho National Laboratory (INL) is an 890 sqmi complex located in the high desert of eastern Idaho, between the town of Arco to the west and the cities of Idaho Falls and Blackfoot to the east. It lies within Butte, Bingham, Bonneville, and Jefferson counties. The lab currently employs more than 4,000 people.

History
The federal research facility was established in 1949 as the "National Reactor Testing Station" (NRTS). In 1975, the Atomic Energy Commission (AEC) was divided into the Energy Research and Development Administration (ERDA) and the Nuclear Regulatory Commission (NRC). The Idaho site was for a short time named ERDA and then subsequently renamed to the "Idaho National Engineering Laboratory" (INEL) in 1977 with the creation of the Department of Energy (DOE) under President Carter. After two decades as INEL, the name was changed again to the "Idaho National Engineering and Environmental Laboratory" (INEEL) in 1997. Throughout its lifetime, there have been more than 50 one-of-a-kind nuclear reactors built by various organizations at the facility for testing; all but three are out of service.

On Feb. 1, 2005, Battelle Energy Alliance took over operation of the lab from Bechtel, merged with Argonne National Laboratory-West, and the facility name was changed to "Idaho National Laboratory" (INL). At this time the site's clean-up activities were moved to a separate contract, the Idaho Cleanup Project, which is managed by CH2M-WG Idaho. Research activities were consolidated in the newly named Idaho National Laboratory.

Access
Most of INL is desert with scrub vegetation and a number of facilities scattered throughout the area; the average elevation of the complex is 5000 ft above sea level. A few publicly accessible highways go through the vast INL, but most of the area (except EBR-I) is restricted to authorized personnel and requires appropriate security clearance. The tiny town of Atomic City is on the INL's southern border, and the Craters of the Moon National Monument is to the southwest.

Next Generation Nuclear Plant (NGNP)
One part of this program to develop improved nuclear power plants is the “Next Generation Nuclear Plant” or NGNP, which would be the demonstration of a new way to use nuclear energy for more than electricity. The heat generated from nuclear fission in the plant could provide process heat for hydrogen production and other industrial purposes, while also generating electricity. And the NGNP would use a high-temperature gas reactor, which would have redundant safety systems that rely on natural physical processes more than human or mechanical intervention.

INL is working with private industry to design, plan and eventually build the NGNP. It was commissioned to lead this effort by the U.S. Department of Energy as a result of the Energy Policy Act of 2005.

Fuel Cycle Research & Development (FCRD)
The Fuel Cycle Research & Development program aims to help expand nuclear energy’s benefits by addressing some of the issues inherent to the current life cycle of nuclear reactor fuel in the United States. These efforts strive to make nuclear energy's expansion safe, secure, economic and sustainable.

Currently, the United States, like many other countries, employs an “open-ended" nuclear fuel cycle, whereby nuclear power plant fuel is used only once and then placed in a repository for indefinite storage. One of the primary FCRD goals is to research, develop and demonstrate ways to “close” the fuel cycle so fuel is reused or recycled rather than being shelved before all of its energy has been used. INL coordinates many of the FCRD's national research efforts, including:
 * Continuing critical fuel cycle research and development (R&D) activities
 * Pursuing development of policy and regulatory framework to support fuel cycle closure
 * Developing deployable technologies
 * Establishing advanced modeling and simulation program elements
 * Implementing a science-based R&D program

Light Water Reactor Sustainability (LWRS) program
The Light Water Reactor Sustainability Program supports national efforts to do the research and gather the information necessary to demonstrate whether it is safe and prudent to apply for extensions beyond 60 years of operating life.

The Program aims to safely and economically extend the service lives of the more than 100 electricity-generating nuclear power plants in the United States. The program brings together technical information, performs important research and organizes data to be used in license-extension applications.

Advanced Test Reactor National Scientific User Facility (ATR NSUF)
INL’s Advanced Test Reactor is a unique research reactor located approximately 50 mi from Idaho Falls, Idaho.

The Department of Energy named Advanced Test Reactor (ATR) a National Scientific User Facility in April 2007. This designation opened the facility to use by university-led scientific research groups and gives them free access to the ATR and other unique resources at INL and partner facilities. In addition to a rolling proposal solicitation with two closing dates each year, INL holds an annual "Users Week" and summer session to familiarize researchers with the user facility capabilities available to them.

Nuclear Energy University Programs (NEUP)
DOE's Nuclear Energy University Programs provides funding for university research grants, fellowships, scholarships and infrastructure upgrades.

For example, in May 2010, the program awarded $38 million for 42 university-led R&D projects at 23 U.S. universities in 17 states. In FY 2009, the program awarded about $44 million to 71 R&D projects and more than $6 million in infrastructure grants to 30 U.S. universities and colleges in 23 states. INL's Center for Advanced Energy Studies administers the program for DOE. CAES is a collaboration between INL and Idaho's three public research universities: Idaho State University, Boise State University and University of Idaho.

Multiphysics Methods Group (MMG)
The Multiphysics Methods Group (MMG) is a program at Idaho National Laboratory (under the U.S. Department of Energy) begun in 2004. It uses multiphysics and modeling software to simulate complex physical and chemical reactions inside nuclear reactors. The ultimate goal of the program is to use these simulation tools to enable more efficient use of nuclear fuel, resulting in lower electricity costs and less waste products. The MMG is made up of 11 members, and is led by Glen Hansen. It coordinates efforts with other specialists in academia and industry.

The MMG focuses on problems within nuclear reactors related to its fuel and how heat is transferred inside the reactor. "Fuel degradation" refers to how uranium pellets and the rods they are encased in (several rods bundled together is what makes a "fuel assembly") eventually wear out over time due to high heat and irradiation inside a reactor. The group states three main objectives: "The mission of the MMG is to support the INL goal to advance the U.S. nuclear energy endeavor by:
 * Furthering the state of computational nuclear engineering
 * Developing a robust technical basis in multidimensional multiphysics analysis methods
 * Developing the next generation of reactor simulation codes and tools"

The work done by the group directly supports programs such as the Light Water Reactor Sustainability Program's research into advanced nuclear fuels.

National and Homeland Security Projects
INL's National and Homeland Security division focuses on two main areas: protecting critical infrastructure such as electricity transmission lines, utilities and wireless communications networks, and preventing the proliferation of weapons of mass destruction.

Control Systems Cybersecurity
For nearly a decade, INL has been conducting vulnerability assessments and developing innovative technology to increase infrastructure resiliency. With a strong emphasis on industry collaboration and partnership, INL is enhancing electric grid reliability, control systems cybersecurity and physical security systems.

INL  conducts advanced cyber training and oversees simulated competitive exercises for national and international customers. The lab supports cyber security and control systems programs for the departments of Homeland Security, Energy and Defense. INL staff members are frequently asked to provide guidance and leadership to standards organizations, regulatory agencies and national policy committees.

In January 2011, it was reported by the New York Times that the INL was allegedly responsible for some of the initial research behind the Stuxnet virus which allegedly crippled Iran's nuclear centrifuges. The INL, which teamed up with Siemens, conducted research on the P.C.S.-7 control system to identify its vulnerabilities. According to the Times, that information would later be used by the American and Israeli governments to create the Stuxnet virus.

The Times article was later disputed by other journalists—including Forbes blogger Jeffrey Carr—as being both sensational and lacking verifiable facts. In March 2011, Vanity Fair Magazine's cover story on Stuxnet carried INL's official response stating, "Idaho National Laboratory was not involved in the creation of the stuxnet worm. In fact, our focus is to protect and defend control systems and critical infrastructures from cyber threats like stuxnet and we are all well recognized for these efforts. We value the relationships that we have formed within the control systems industry and in no way would risk these partnerships by divulging confidential information."

Nuclear nonproliferation
Building on INL's nuclear mission and legacy in reactor design and operations, the lab's engineers are developing technology, shaping policy and leading initiatives to secure the nuclear fuel cycle and prevent the proliferation of weapons of mass destruction.

Under the direction of the National Nuclear Security Administration, INL and other national laboratory scientists are leading a global initiative to secure foreign stockpiles of fresh and spent highly enriched uranium and return it to secure storage for processing . Other engineers are working to convert U.S. research reactors and build new reactor fuels that replace highly enriched uranium with a safer, low-enriched uranium fuel. To protect against threats from the dispersal of nuclear and radiological devices, INL researchers also examine radiological materials to understand their origin and potential uses. Others have applied their knowledge to the development of detection technologies that scan and monitor containers for nuclear materials.

The laboratory's expansive desert location, nuclear facilities and wide range of source materials provide an ideal training location for military responders, law enforcement and other civilian first responders. INL routinely supports these organizations by leading classroom training, conducting field exercises and assisting in technology assessments.

Advanced Vehicle Testing Activity
INL’s Advanced Vehicle Testing Activity gathers information from more than 4000 plug-in-hybrid vehicles. These vehicles, operated by a wide swath of companies, local and state governments, advocacy groups, and others are located all across the United States, Canada and even Finland. Together, they’ve logged a combined 1.5 million miles worth of data that is analyzed by specialists at INL.

Dozens of other types of vehicles, like hydrogen-fueled and pure electric cars, are also tested at INL. This data will help evaluate the performance and other factors that will be critical to widespread adoption of plug-in or other alternative vehicles. See also, The EV Project.

Bioenergy
INL researchers are partnering with farmers, agricultural equipment manufacturers and universities to optimize the logistics of an industrial-scale biofuel economy. Agricultural waste products — such as wheat straw; corncobs, stalks or leaves; or bioenergy crops such as switchgrass or miscanthus — could be used to create cellulosic biofuels. INL researchers are working to determine the most economic and sustainable ways to get biofuel raw materials from fields to biorefineries.

Robotics
INL’s robotics program researches, builds, tests and refines robots that, among other things, clean up dangerous wastes, measure radiation, scout drug-smuggling tunnels, aid search-and-rescue operations, and help protect the environment.

These robots roll, crawl, fly, and go under water, even in swarms that communicate with each other on the go to do their jobs.

Biological Systems
The Biological Systems department is housed in 15 laboratories with a total of 12000 sqft at the INL Research Center in Idaho Falls. The department engages in a wide variety of biological studies, including studying bacteria and other microbes that live in extreme conditions such as the extremely high temperature pools of Yellowstone National Park. These types of organisms could boost the efficiency of biofuels production. Other studies related to uncommon microbes have potential in areas such as carbon dioxide sequestration and groundwater cleanup.

Hybrid Energy Systems
INL is pioneering the research and testing associated with hybrid energy systems that combine multiple energy sources for optimum carbon management and energy production. For example, a nuclear reactor could provide electricity when certain renewable resources aren't available, while also providing a carbon-free source of heat and hydrogen that could be used, for example, to make liquid transportation fuels from coal.

Nuclear Waste Processing
The Integrated Waste Treatment Unit (IWTU)

Construction of a new liquid waste processing facility is nearly completed at INTEC on the INL Site. It will process approximately 900,000 gallons of liquid nucear waste using a steam reforming process to produce a granular product suitable for disposal. The facility is the first of its kind an based on a scaled prototype. The project is a part of the Department of Energy's Idaho Cleanup Project aimed at removing waste and demolishing old nuclear facilities at the INL site.

Interdisciplinary projects
The Instrumentation, Control and Intelligent Systems (ICIS) Distinctive Signature supports mission-related research and development in key capability areas: safeguards and control system security, sensor technologies, intelligent automation, human systems integration, and robotics and intelligent systems. These five key areas support the INL mission to “ensure the nation’s energy security with safe, competitive, and sustainable energy systems and unique national and homeland security.” Through its grand challenge in resilient control systems, ICIS research is providing a holistic approach to aspects of design that have often been bolt-on, including human systems, security and modeling of complex interdependencies.

Scholarships and Grants
INL supports science, technology, engineering and math (STEM) education in classrooms across the state. Each year, the lab invests nearly $500,000 in Idaho teachers and students. Funding goes toward scholarship programs for high school graduates, technical college students and teachers who want to integrate more hands-on science activities into their lessons. INL also provides thousands of dollars worth of classroom grants to teachers seeking to upgrade their science equipment or lab infrastructure.

Internships
The lab hires more than 200 interns each summer to work alongside laboratory employees. INL is listed by Vault, the online job resource site, as one of the best places in the U.S. to get an internship Internships are offered to high school, undergraduate, graduate and post-graduate students in applicable fields including science, engineering, math, chemistry, business, communication and other fields.

Small Business Outreach
In addition to subcontracting more than $100 million worth of work from Idaho's small businesses, INL technologies are often licensed to new or existing companies for commercialization. In the past 10 years, INL has negotiated roughly 500 technology licenses. And INL technology has spawned more than 40 start-up companies since 1995.

Small businesses that contract with the lab can participate in a Department of Energy program designed to enhance their capabilities. INL has worked with a variety of small businesses in this mentoring capacity, including International Management Solutions and Portage Environmental.

Advanced Test Reactor (ATR)m Complex
INL’s Advanced Test Reactor is much smaller than the more common electricity-producing reactors — the reactor vessel measures 12 ft across and 36 ft high, with the core a mere 4 ft tall and 50 inches across, and it does not generate electricity. As a special feature, it allows scientists to simultaneously test materials in multiple unique experimental environments. Research scientists can place experiments in one of the more than 70 test positions in the reactor. Each can generate unique experimental conditions.

Some have called the reactor a “virtual time machine,” for its ability to demonstrate the effects of several years of radiation on materials in a fraction of the time.

The ATR allows scientists to place a great variety of materials in an environment with specified intensities of radiation, temperature and pressure. Specimens are then removed to examine how the time in the reactor affected the materials. The U.S. Navy is the facility's primary user, but the ATR also produces medical isotopes that can help treat cancer patients and industrial isotopes that can be used for radiography to x-ray welds on items such as skyscrapers, bridges and ship holds.

Many ATR experiments focus on materials that could make the next generation of nuclear reactors even safer and longer lasting.

Hot Fuel Examination Facility
The Hot Fuel Examination Facility gives INL researchers and other scientists the ability to examine and test highly radioactive irradiated reactor fuel and other materials.

HFEF provides 15 state-of-the-art workstations known as hot cells. For windows, each cell has leaded glass panes layered 4 ft thick and separated by thin layers of oil. Remote manipulators allow users to maneuver items inside the hot cell using robotic arms. And special filtered exhaust systems keep indoor and outdoor air safe. At these stations, scientists and technicians can better determine the performance of irradiated fuels and materials. Scientists can also characterize materials destined for long-term storage at the Waste Isolation Pilot Plant in New Mexico.

Space and Security Power Systems Facility
The New Horizons mission to Pluto, which launched in 2006, is powered by a device assembled at this INL facility. The Radioisotope Thermoelectric Generator (RTG) uses nonweapons-grade plutonium to produce heat and electricity for deep space missions such as this one.

Using the RTG on the New Horizons mission is a more practical power source for the satellite than solar panels because the satellite will travel to such a great distance that energy from the sun would provide insufficient power for the craft. Work on the project started in late 2004 and ended with the January 2006 successful rocket launch. The team implemented the fueling, testing and delivery of the RTG for the Pluto New Horizons mission and for the next Mars rover.

Fuel Conditioning Facility
INL's Fuel Conditioning Facility uses electrolysis to separate certain components from used nuclear fuel rods. Unlike traditional aqueous reprocessing techniques, which dissolve the fuel rods in acid, "pyroprocessing" melts the rods and uses electricity to separate components such as uranium and sodium out of the mix. INL is using this technique to remove the sodium metal from EBR-II fuel rods so they can be safely stored in a national repository.

Critical Infrastructure Test Range Complex (CITRC)
The Critical Infrastructure Test Range at INL's 890 sqmi Site allows researchers to conduct resiliency exercises and experiments from conceptual design to full-scale demonstration. INL also has access to a utility-scale power grid, substations, unique real-time modeling and simulation systems, and vendor-supplied Supervisory Control and Data Acquisition (SCADA) systems for demonstration and deployment exercises. In addition, INL owns and operates a communications network designed to research and test cellular, mobile and emerging Internet communication protocols and technology, with both fixed and mobile 3-G platforms that allow testing and demonstration within a range of experimental frequencies in a low-background environment.

Center for Advanced Energy Studies (CAES)
This unique partnership between INL and Idaho's three public research universities — Idaho State University, University of Idaho and Boise State University — boasts a wealth of research expertise. Its researchers, who have access to each partner institution’s equipment and infrastructure, have competed for and won millions of dollars in national funding for their projects. CAES possesses capabilities and infrastructure unique to the region and nation. The center’s laboratories are equipped with state-of-the-art research instruments and tools, including a Local Electrode Atom Probe (LEAP) and a Computer Assisted Virtual Environment (CAVE).

Matched Index of Refraction (MIR) facility
The Matched Index of Refraction facility is the largest such facility in the world. Using light mineral oil, the facility allows researchers to use fused quartz models built to scale to study the flow of liquids inside and around objects with complicated geometries, such as the core of a nuclear reactor. The facility is basically a giant loop through which the mostly transparent oil is pumped at variable speeds. Special lasers perform “Doppler velocimetry,” that produces a 3-D image allowing inspection of an object’s flow properties. Observers can also watch the flow themselves through the polycarbonate viewing panes near the laser equipment. YouTube video

Geocentrifuge
INL’s geocentrifuge helps researchers, among other efforts, improve models of how liquids and contaminants move through engineered caps and barriers used in underground waste disposal facilities.

The INL centrifuge is one of fewer than 25 geocentrifuges larger than two meters (about 6 feet) in the United States. The centrifuge, located next to the INL Research Center in Idaho Falls, can be operated remotely by computer and is capable of applying 130 times the force of earth’s gravity on a sample.

Many of the experiments that use the geocentrifuge require it to run for hundreds of hours in order to correctly simulate several years’ worth of gravitational effects. The payload is monitored by an onboard computer and can be relayed to a remote monitoring station outside the centrifuge’s chamber where technicians can observe developments.

Earlier projects
Much of current knowledge about how nuclear reactors behave and misbehave was discovered at what is now Idaho National Laboratory. John Grossenbacher, current INL director, said, "The history of nuclear energy for peaceful application has principally been written in Idaho." More than 50 reactors have been built by various organizations at what is commonly called “the Site,” including the ones that gave the world its first usable amount of electricity produced from nuclear power and the power plant for the world’s first nuclear submarine. Although many are now decommissioned, these facilities represent the largest concentration of reactors in the world.

Naval Proving Ground
What is now Idaho National Laboratory in southeastern Idaho began its life as a U.S. government artillery test range in the 1940s. Shortly after the Japanese attacked Pearl Harbor, the U.S. military needed a safe location for performing maintenance on the Navy’s most powerful turreted guns (16-inch diameter). The guns were brought in via rail to near Pocatello, Idaho, to be re-sleeved, rifled and tested.

In 1949, the U.S. Atomic Energy Commission established the National Reactor Testing Station or NRTS at the site.

As the Navy began to focus on post-World War II threats, the types of projects worked on in the Idaho desert changed, too. Perhaps the most well-known was the building of the prototype reactor for the world’s first nuclear-powered submarine, the USS Nautilus

Experimental Breeder Reactor-I (EBR-I)
In the early afternoon of Dec. 20, 1951, Argonne National Laboratory scientist Walter Zinn and a small crew of assistants witnessed a row of four light bulbs light up in a nondescript brick building in the eastern Idaho desert. Electricity from a generator connected to Experimental Breeder Reactor-I (EBR-I) flowed through them. This was the first time that a usable amount of electrical power had ever been generated from nuclear fission.

Only days afterward, the reactor produced all the electricity needed for the entire EBR complex. One ton of natural uranium can produce more than 40 million kilowatt-hours of electricity — this is equivalent to burning 16,000 tons of coal or 80,000 barrels of oil.

More central to EBR-I’s purpose than just generating electricity, however, was its role in proving that a reactor could create more nuclear fuel as a byproduct than it consumed during operation. In 1953, tests verified that this was the case. The site of this event is memorialized as a Registered National Historic Landmark, open to the public every day Memorial Day through Labor Day.

Fatal incident
On January 3, 1961, the only fatal nuclear reactor incident in the U.S. occurred at the NRTS. An experimental reactor called SL-1 (Stationary Low-Power Plant Number 1) was destroyed when a control rod was pulled too far out of the reactor, leading to core meltdown and a steam explosion. The reactor vessel jumped up 9 ft. The concussion and blast killed all three military enlisted personnel working on the reactor. Due to the extensive radioactive isotope contamination, all three were buried in lead coffins. The events are the subject of two books, one published in 2003, Idaho Falls: The untold story of America's first nuclear accident, and another, Atomic America: How a Deadly Explosion and a Feared Admiral Changed the Course of Nuclear History, published in 2009.

Incidents: container leaks "plutonium-related-materials"
On November 8, 2011 in the Zero Physics Power Reactor (ZPPR) in the afternoon a container leaked "plutonium-related" materials, when it was opened by one of the workers. All 17 workers at the incident were immediately taken to have testing done by the Idaho Cleanup Project in the form of Whole Body Counts (scans the body for any internal radiation exposure) and were required to submit urine and fecal samples to further test for internal radioisotopes. Six of them proved to be exposed to "low-level-radiation", two of them fairly extensively. All workers were kept under close observation afterwards with repeated Whole Body Counts and urine and fecal sampling. The Idaho National Laboratory insisted that no radioactivity leaked outside the facility. Investigations were done to determine how and why the container could open itself.

Experimental Breeder Reactor-II (EBR-II)
From 1969 to 1994, Argonne National Laboratory’s EBR-II produced nearly half of the electricity needed for test site operations.

In 1964, Experimental Breeder Reactor II and the nearby Fuel Conditioning Facility proved the concept of fuel recycling and passive safety characteristics. So-called “passive” safety includes systems that rely on natural physics laws such as gravity rather than systems that require mechanical or human intervention.

In a landmark test on April 3, 1986, such systems in EBR-II demonstrated that nuclear power plants could be designed to be inherently safe from severe accidents

Loss of Fluid Test (LOFT) facility
The world’s first Loss-of-Fluid-Test reactor started up at INL on March 12, 1976. It repeatedly simulated loss-of-coolant accidents that could potentially occur in commercial nuclear power plants. Many safety designs for reactors around the world are based on these tests. LOFT experiments helped accident recovery efforts after the Three Mile Island accident in 1979.

Test Area North
In 1949, an area of the fringe of the NRTS property named "Test Area North", or TAN, was developed by the U.S. Air Force and the Atomic Energy Commission to support the Aircraft Nuclear Propulsion program's attempt to develop a nuclear-powered aircraft. The programs' Heat Transfer Reactor Experiments (HTRE) were conducted here in 1955 by contractor General Electric, and were a series of tests to develop a system of transferring reactor-heated air to a modified General Electric J47 jet engine. The planned aircraft, the Convair X-6, was to be test flown at TAN, and a large hangar with radiation shielding was built on the site. The program was cancelled, however, before the accompanying 15000 ft runway was built.

Naval Reactors Facility (NRF)
In the early 1950s, the very first full-scale prototype nuclear plant for shipboard use, called S1W Prototype, was constructed to test the feasibility of using nuclear power aboard submarines. It was the predecessor to a similar nuclear plant of S2W design installed in the first nuclear-powered ship, the submarine USS Nautilus (SSN-571). Later, two more prototype plant facilities, A1W and S5G, were built at this location called the Naval Reactors Facility (NRF for short). There is also an Expended Core Facility (ECF for short) also at NRF as well as administrative buildings/facilities. NRF's chemistry lab was located at the S1W prototype. By now, the prototype plants for shipboard use development have been shut down. Only the Expended Core Facility / Dry Storage Area is in use.

Materials Test Reactor (MTR)
When the nuclear industry was just getting started in the early 1950s, it was difficult to predict exactly how different kinds of metals and other materials would be affected by being used in a reactor for prolonged periods of time. MTR was a research reactor jointly designed by Argonne and Oak Ridge National Laboratories that operated until 1970 and provided important data, helping researchers make nuclear power reactors safer and longer lasting.

BORAX Experiments
The Boiling Water Reactors (BORAX) experiments were five reactors built between 1953 and 1964 by Argonne National Laboratory. They proved that the boiling water concept was a feasible design for an electricity-producing nuclear reactor. One of the BORAX reactors (III) was also the first in the world to power a city (Arco, Idaho) on July 17, 1955. Video from 1950s of Arco's lighting

Other sites
The Idaho Chemical Processing Plant chemically processed material from used reactor cores to recover reusable nuclear material. It is now called the Idaho Nuclear Technology and Engineering Center.

The Materials Test Area tested materials' exposure to reactor conditions. The Materials Test Area is part of the Advanced Test Reactor Complex.

Central Facilities Area where whole body counts for radioactivity are done for INL employees.

Idaho National Laboratory’s Advanced Vehicle Testing Activity (AVTA) about plug-in hybrids (PHEVs).

In the news
The New York Times reported in 2005 that a reactor at INL would be used to manufacture plutonium-238, most of it for classified national security purposes. This isotope is known for its intense alpha decay, which is useful in making extremely long-lived power sources such as radioisotope thermoelectric generators (RTG)s for deep space probes and heart pacemaker batteries. INL has 52 reactors, three of which are reportedly still operating (see list of nuclear reactors). The Idaho State Journal reported that the batteries would be used for a voyage to Jupiter's moons and the New Horizons trip to Pluto.