NASA’s radioisotope-powered science will persevere on MarsNuclear NewsResearch & ApplicationsFebruary 19, 2021, 3:00PM|Nuclear News StaffMembers of the Perseverance rover team in Mission Control at NASA’s Jet Propulsion Laboratory react after receiving confirmation of a successful landing. Photo: NASA/Bill IngallsNASA mission control and space science fans around the world celebrated the safe landing of the Mars 2020 Perseverance rover on February 18 after a journey of 203 days and 293 million miles. Landing on Mars is difficult—only about 50 percent of all previous Mars landing attempts have succeeded—and a successful landing for Perseverance, the fifth rover that NASA has sent to Mars, was not assured. Confirmation of the successful touchdown was announced at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., at 3:55 p.m. EST.“This landing is one of those pivotal moments for NASA, the United States, and space exploration globally—when we know we are on the cusp of discovery and sharpening our pencils, so to speak, to rewrite the textbooks,” said acting NASA administrator Steve Jurczyk. “The Mars 2020 Perseverance mission embodies our nation’s spirit of persevering even in the most challenging of situations, inspiring, and advancing science and exploration. The mission itself personifies the human ideal of persevering toward the future and will help us prepare for human exploration of the Red Planet.”Only radioisotope thermoelectric generators (RTG) can provide the long-lasting, compact power source that Perseverance needs to carry out its long-term exploratory mission. Perseverance carries an RTG powered by the radioactive decay of plutonium-238 that was supplied by the Department of Energy. ANS president Mary Lou Dunzik-Gougar and CEO and executive director Craig Piercy congratulated NASA after the successful landing, acknowledging the critical contributions of the DOE’s Idaho National Laboratory, Oak Ridge National Laboratory, and Los Alamos National Laboratory.In this illustration, Perseverance guides itself toward the target landing site in the Jezero Crater. Credits: NASA/JPL-Caltech.NASA’s Perseverance rover sent this image to Earth after touching down on Mars. Credit: NASA/JPL-CaltechA long, strange trip: Perseverance’s journey to Mars began on July 30. Before the "EDL" (entry, descent, and landing) began less than seven months later, on February 18, the aeroshell containing the rover was traveling at nearly 12,500 miles per hour. Rapid deceleration as the rover descended through the relatively thin atmosphere of Mars was aided by supersonic parachute and by thrusters to bring the rover to a walking speed of about 1.7 miles per hour just before touchdown. The dramatic series of critical EDL maneuvers is captured in a NASA video released prior to the successful landing.Perseverance landed within its target, the 28-mile-wide Jezero Crater. Scientists had determined that Jezero once had its own river delta and was filled with water, and that the environment was likely to have preserved signs of any life from billions of years ago. The steep cliffs, sand dunes, and boulder fields of Jezero made the landing the most challenging ever attempted.The mission: The 2,263-pound Perseverance, which is about the size of a car, will undergo several weeks of testing and receive new software before it begins a two-year science investigation within Jezero. During the same period, the Ingenuity Mars Helicopter team will prepare the small drone, which is currently attached to the rover’s undercarriage, for the first attempt at a controlled, powered aerodynamic flight on another planet.A key objective for Perseverance’s mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will characterize the planet’s geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith, according to NASA. Subsequent NASA missions, in cooperation with the European Space Agency, will send spacecraft to Mars to collect sealed samples from the surface and return them to Earth for in-depth analysis.Two other scientific missions successfully entered Mars orbit earlier this month. China expects to land its Tianwen-1 rover within months to look for signs of life in a different part of the planet. The United Arab Emirates has sent a probe it calls Hope to study the weather and atmosphere on Mars and to possibly provide clues to changes that made the planet inhospitable to life.Power specs: According to NASA, Perseverance’s power system is identical to the one used on the Mars Science Laboratory's Curiosity rover, which has been used successfully since its launch in 2011. The RTG uses the heat from the radioactive decay of plutonium-238 to generate a steady flow of about 110 watts of electricity at the start of the mission, which will decline by a few percent each year.The RTG weighs about 99 pounds and contains 10.6 pounds of plutonium dioxide. While the system has a design life of 17 years, it can be expected to produce power for much longer.The RTG does not just power the rover; heat transported through a fluid loop will keep the rover’s electronics warm on a planet that has an average temperature of -64 °F.Two lithium-ion batteries, charged by the RTG, are available to meet peak demands of rover activities when the demand temporarily exceeds the RTG’s electrical output levels.Tags:curiositydoeinllanlmarsnasaornlperseverancertgspaceShare:LinkedInTwitterFacebook
DOE steps up plutonium production for future space explorationThis high-resolution still image is from a video taken by several cameras as NASA’s Perseverance rover touched down on Mars on February 18. Credits: NASA/JPL-CaltechNASA’s Perseverance rover, which successfully landed on Mars on February 18, is powered in part by the first plutonium produced at Department of Energy laboratories in more than 30 years. The radioactive decay of Pu-238 provides heat to radioisotope thermoelectric generators (RTGs) like the one onboard Perseverance and would also be used by the Dynamic Radioisotope Power System, currently under development, which is expected to provide three times the power of RTGs.Idaho National Laboratory is scaling up the production of Pu-238 to help meet NASA’s production goal of 1.5 kg per year by 2026, the DOE announced on February 17.Go to Article
INL seeks efficiency boost for radioisotope-powered spacecraftThe RTG used to power the Mars Perseverance rover is shown here being placed in a thermal vacuum chamber for testing in a simulated near-space environment. Source: INLThe Department of Energy’s Idaho National Laboratory is celebrating the scheduled landing of the Perseverance rover on the surface of Mars in just two days’ time with a live Q&A today, February 16, from 3 p.m. to 4:30 p.m. EST).INL and Battelle Energy Alliance, its management and operating contractor, are already looking ahead to the next generation of plutonium-powered spacecraft: the Dynamic Radioisotope Power System (Dynamic RPS). INL announced on February 15 that it is partnering with NASA and the DOE to seek industry engagement to further the design of this new power system.Go to Article
Statement on the successful landing of NASA's Perseverance rover on MarsANS congratulates NASA for the successful landing of Perseverance on Mars. We look forward to watching from afar its exploration of the Red Planet and search for past microbial life. This is a proud moment as well for nuclear science and technology as a multi-mission radioisotope thermoelectric generator will be powering the rover to mission success.Go to Article
Demolition of former radioisotope lab underway at ORNLA view of the demolition of a hot cell inside a protective cover at the former radioisotope development lab at ORNL. Photo: DOEThe Department of Energy’s Oak Ridge Office of Environmental Management and contractor UCOR have begun removing the two remaining structures at the former radioisotope development laboratory at Oak Ridge National Laboratory, in Tennessee.“This project launches our next phase of major demolition and cleanup at ORNL,” said Nathan Felosi, ORNL’s portfolio federal project director for OREM. “Our work is eliminating contaminated structures, like this one, that are on DOE’s list of high-risk facilities and clearing space for future research missions.”The project is scheduled to be completed this spring, OREM reported on February 23.Go to Article
Researchers report fastest purification of astatine-211 needed for targeted cancer therapyAstatine-211 recovery from bismuth metal using a chromatography system. Unlike bismuth, astatine-211 forms chemical bonds with ketones.In a recent study, Texas A&M University researchers have described a new process to purify astatine-211, a promising radioactive isotope for targeted cancer treatment. Unlike other elaborate purification methods, their technique can extract astatine-211 from bismuth in minutes rather than hours, which can greatly reduce the time between production and delivery to the patient.“Astatine-211 is currently under evaluation as a cancer therapeutic in clinical trials. But the problem is that the supply chain for this element is very limited because only a few places worldwide can make it,” said Jonathan Burns, research scientist in the Texas A&M Engineering Experiment Station’s Nuclear Engineering and Science Center. “Texas A&M University is one of a handful of places in the world that can make astatine-211, and we have delineated a rapid astatine-211 separation process that increases the usable quantity of this isotope for research and therapeutic purposes.”The researchers added that this separation method will bring Texas A&M one step closer to being able to provide astatine-211 for distribution through the Department of Energy’s Isotope Program’s National Isotope Development Center as part of the University Isotope Network.Details on the chemical reaction to purify astatine-211 are in the journal Separation and Purification Technology.Go to Article
ANS Fellows elected to National Academy of EngineeringMagwoodPetersANS Fellows William D. Magwood IV and Mark T. Peters have been elected to the National Academy of Engineering (NAE).Magwood, an ANS member since 1983, is the secretary general for the OECD Nuclear Energy Agency. He was elected for “leadership and contributions to research programs that drive innovation in global nuclear energy enterprises.”Peters, an ANS member since 2007 and the executive vice president for Laboratory Operations at Battelle, was elected “for leadership and contributions in advancing U.S. nuclear energy capabilities and infrastructure.”Go to Article
DOE extends comment period on VTR environmental reviewThe Department of Energy has extended the public review and comment period for the Draft Versatile Test Reactor Environmental Impact Statement (DOE/EIS-0542) through March 2, 2021.The DOE issued the draft EIS for the Versatile Test Reactor (VTR) for comment on December 21, 2020. The draft document identifies Idaho National Laboratory as the DOE’s preferred location for the VTR, a proposed sodium-cooled fast-neutron-spectrum test reactor that, according to the DOE, will enhance and accelerate research, development, and demonstration of innovative nuclear energy technologies.In August 2020, Battelle Energy Alliance, which operates INL for the DOE, began contract negotiations with a Bechtel National–led team that includes TerraPower and GE Hitachi Nuclear Energy to support the design and construction of the VTR.Go to Article
Savannah River crews remove cesium columns from tank closure unitWork crews remove the first column filled with cesium from the Tank Closure Cesium Removal unit by crane in H tank farm at the Savannah River Site. Photo: DOEColumns filled with cesium have been removed at the Savannah River Site in a demonstration project designed to accelerate removal of radioactive salt waste from underground tanks.“On the surface, it appeared to be like any other crane lift and equipment transport, which are routinely performed in the tank farms. However, this equipment contained cesium-rich, high-level waste, which was transported aboveground via roadway to an on-site interim safe storage pad,” said Savannah River Remediation (SRR) president and project manager Phil Breidenbach. “It was all handled safely and executed with outstanding teamwork by our highly skilled workforce.”Operated by liquid waste contractor SRR, a system known as the Tank Closure Cesium Removal (TCCR) unit removes cesium from the salt waste in Tank 10 in the site's H Tank Farm. The TCCR is a pilot demonstration that helps accelerate tank closure at the site, according to a report by the Department of Energy on February 9.Go to Article
DOE gets go-ahead to build spent fuel/high-level waste railcarsGraphical rendering of Fortis railcar design with spent nuclear fuel cask. Image: DOEThe Association of American Railroads (AAR) recently gave the Department of Energy approval to begin building and testing Fortis, a high-tech railcar designed specifically to transport the nation’s spent nuclear fuel and high-level radioactive waste. Fortis is one of two specialized railcars under development by the DOE that could be operational within the next five years.Fortis is an eight-axle, flat-deck railcar that will be able to transport large containers of spent fuel and HLW. It is equipped with high-tech sensors and monitoring systems that report 11 different performance features back to the operators in real time. The railcar design was completed earlier this year, with technical support from Pacific Northwest National Laboratory.According to the DOE, AAR signed off on the design in January, allowing the department to begin fabricating and testing the prototype in compliance with the rail industry’s highest design standard for railcars transporting spent fuel and HLW.Go to Article
NNSA extends comment period on scope of “dilute and dispose” EISThe Department of Energy’s National Nuclear Security Administration has extended to February 18 the public comment period for the scoping of its planned environmental impact statement (EIS) for the Surplus Plutonium Disposition Program, which would dilute and dispose of 34 metric tons of surplus military grade plutonium.The NNSA on December 16 announced its intent to prepare the EIS, which will examine the agency’s preferred alternative, “dilute and dispose,” also known as “plutonium downblending,” and other alternatives for disposing of the material. The NNSA has been pursuing the dilute-and-dispose approach to managing the surplus plutonium following the cancellation of the MOX Fuel Fabrication Facility at the DOE’s Savannah River Site.Go to Article