logo
* 搜尋
* 核能資訊中心
* 中心簡介
* 相關資訊
* 瀏覽人數
今天: 36
昨天: 251
本月: 3903
總計: 551822
國際核能現況 : Decommissioning milestone for space fuel plant
發表人 nicenter 於 2018/11/5 9:30:50 (11 人讀取)

Decommissioning milestone for space fuel plant


Equipment contaminated with plutonium from the manufacturing of fuel for deep space missions has been removed from the 235-F building at the US Department of Energy's Savannah River Site, marking a milestone in reducing risk at the South Carolina facility.




Operators prepare for training in the 235-F mock-up (Image: DOE Office of Environmental Management)

The Plutonium Fuel Form (PuFF) Facility, located in 235-F, was used to make fuel spheres and pellets out of plutonium-238 (Pu-238). These were used to power deep space missions, such as the Galileo space probe to Jupiter launched from the Space Shuttle Atlantis in October 1989.


The PuFF Facility contains nine cells of thick concrete walls with shielded windows. An estimated 1500 grams of Pu-238 remain in its shielded cells. Its removal is extremely challenging because of the amount of material involved, the very tight spaces with limited accessibility, and the way in which the spheres and pellets were made, which means the Pu-238 was left in some cells as a very fine particulate dust that is easily disturbed. Material entered the facility in Cell 1 and travelled through the other cells to be made into spheres and pellets, handled with remote manipulators.


The Savannah River National Laboratory is using existing technology and developing new tools to locate and remove the Pu-238 or to fix it to ensure it will not become mobile during decontamination activities. Any Pu-238 and tools containing it will be safely stored for eventual packaging and shipment to the Waste Isolation Pilot Plant in New Mexico for disposal. The material to be removed includes wires and manipulator handles. Operators will work remotely as they pass the items through the cells for removal, after which the cells will be vacuumed and otherwise cleaned to remove the leftover plutonium. DOE Office of Environmental Management workers have practiced cleanup work in a mock-up of 235-F.


"This material removal marks a huge milestone in the multi-year process to reduce the risk and clean up the PuFF Facility cells," 235-F Project Manager Jeff Hasty said. "We started planning for removal in 2012 and have been preparing the cells since then. Work completed so far in the facility includes removing fixed combustibles, upgrading the fire detection system, de-energizing unneeded electrical circuits, draining and cleaning shield windows after their partial disassembly, and installing light sources."


Deep space missions require reliable, long-lasting power sources both for propulsion once they are in space and to power experiments and equipment. Radioisotope thermoelectric generators (RTGs), usually powered by Pu-238, have been widely used as power sources in satellites and other space but production of the isotope ceased at Savannah River in 1988 and supplies are now scarce. The USA's The National Aeronautics and Space Administration currently testing the Kilopower reactor, a uranium-fuelled Stirling engine for use in possible future missions to Mars.


Researched and written by World Nuclear News



source: http://www.world-nuclear-news.org/Articles/Decommissioning-milestone-for-space-fuel-plant



其他新聞
2018/11/21 9:26:55 - South Africa to resume radioisotope production
2018/11/21 9:25:09 - Renewables experience could benefit US SMR deployment
2018/11/21 9:22:08 - 原能會持續審查及現場視察核二廠1號機第26次大修再起動申請案
2018/11/21 9:19:20 - 回應空污遊行訴求 台電火力電廠積極投入改善 致力減少空污排放
2018/11/19 9:34:29 - PRISM selected for US test reactor programme
2018/11/19 9:27:09 - UK HPR1000 moves to next design assessment stage
2018/11/19 9:25:07 - Orano prepares Fugen ATR fuel for reprocessing
2018/11/14 9:20:55 - 行政院107年11月8日通過核研所改行政院法人「原子能科技研究院」
2018/11/14 9:14:47 - 原能會於今(13)日接獲台電公司核二廠1號機第26次大修後再起動臨界申請
2018/11/9 9:44:29 - Toshiba decides to scrap Moorside project
2018/11/7 9:30:04 - Hurricane-hit Puerto Rico to consider nuclear power
2018/11/7 9:28:12 - Saudi Arabia lays research reactor foundation stone
2018/11/7 9:25:41 - First reactor on Russia's floating plant starts up
2018/11/7 9:21:42 - Cameco notes market improvements
2018/11/5 9:36:36 - UK, Canada sign Nuclear Cooperation Agreement
2018/11/5 9:34:12 - Idaho proposed for HALEU fuel fabrication
2018/11/5 9:32:35 - IAEA reviews long-term safety of Argentinean plant
2018/11/5 9:30:50 - Decommissioning milestone for space fuel plant
2018/11/5 9:26:17 - 除役首部曲 核一乾貯核定計畫遭新北市府認定失效 台電今再提訴願
2018/11/2 9:51:26 - Climate goal demands huge boost in Chinese nuclear

 線上期刊目錄

 友善連結

單位類

行政院原子能委員會
放射性物料管理局
核能研究所
國立清華大學工程與系統科學系
國立清華大學生醫工程與環境科學系
中華民國核能學會
財團法人核能科技協進會

新聞類


30013 新竹市光復路二段101號 創新育成中心三樓309室 電話:(03)571-1808 傳真:(03)572-5461 Email: nicenter@nicenter.org.tw