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词条 Transient Reactor Test Facility
释义

  1. Fuel and core

  2. Experimental capabilities

     Hodoscope   Neutron radiography facility  

  3. Systems

      Control rod drive  

  4. Restart

  5. Completion of First Fueled Experiment

  6. General reference

  7. Specific references

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The Transient Reactor Test Facility (TREAT) is an air-cooled, graphite moderated, thermal spectrum test nuclear reactor designed to test reactor fuels and structural materials.[1] Constructed in 1958, and operated from 1959 until 1994, TREAT was built to conduct transient reactor tests where the test material is subjected to neutron pulses that can simulate conditions ranging from mild transients to reactor accidents. TREAT was designed by Argonne National Laboratory,[2] and is located at the Idaho National Laboratory. Since original construction, the facility had additions or systems upgrades in 1963, 1972, 1982, and 1988. The 1988 addition was extensive, and included upgrades of most of the instrumentation and control systems.[3]

The U.S. Department of Energy (DOE) has decided to resume a program of transient testing,[4][5][6][7][8] and plans to invest about $75 million to restart the TREAT facility by 2018. The renewed interest in TREAT was sparked by the 2011 Fukushima Daiichi nuclear disaster, which prompted the shutdown of Japan's and Germany's nuclear plants. One use for TREAT is planned to be testing of new accident-tolerant fuel for nuclear reactors.[9][10][11] TREAT was successfully restarted in November 2017.

Fuel and core

The TREAT fuel assemblies are approximately 9 feet long, and 4 inches square in cross section. The fuel is a graphite uranium mixture, with 1 part uranium to 10,000 parts graphite. The active portion of the fuel assembly is about 48 inches, with a graphite reflector of about 24 inches above and below the active portion. The active portion of the fuel assemblies are encased with Zircaloy. There is also a graphite axial reflector, composed of two parts. The first part of the axial reflector consists of movable assemblies similar to the fuel assemblies, but containing only graphite and no fuel. The second part of the axial reflector consists of permanent blocks of graphite, approximately 24 inches thick, stacked outside the core cavity. This permanent reflector was reclaimed from Chicago Pile-1, the world's first nuclear reactor. The core may be loaded to a size of 5 feet by 5 feet (nominal) up to 6 feet by 6 feet (maximum), depending on the needs of the experiment.[12][13]

As described above, the fuel is composed of a mixture of graphite and uranium. The uranium is in the form of uranium oxide particles that are approximately 20 microns in size, and are in direct contact with the graphite moderator. The graphite, in addition to being the neutron moderator, also acts as a large thermal heat sink. The time lag of the heat transfer is on the order of 1 millisecond, much faster than the heat transfer to a liquid coolant flowing past fuel assemblies. Also, when the graphite is heated it creates a sizable negative moderator temperature coefficient. These characteristics allow TREAT to produce large ‘self-limited’ transients, which are limited by the fuel negative moderator coefficient without control rod movement.[13]

Experimental capabilities

TREAT is capable of a wide range of operations and test conditions. TREAT can operate at a steady state power of 100 kW, produce short transients of up to 19 GW, or produce shaped transients controlled by the TREAT automatic reactor control system and the Control Rods. A test assembly can be inserted in the center of the core. The test assembly is a self-contained vehicle, that can contain fuel or materials for a variety of reactor types.[14] These test assemblies, also referred to as test vehicles or test loops, can simulate the conditions of a light water reactor, heavy water reactor, liquid metal fast breeder reactor, or a gas cooled reactor.[15]

In some experiments, provisions were made to make high speed film recordings of the experiment, [https://www.youtube.com/watch?v=h0o4P_F4s9s such as these videos].

Hodoscope

TREAT has a fast-neutron hodoscope that collimates and detects fast fission neutrons emitted by the experiment fuel sample.

The TREAT hodoscope consists of a front collimator, a rear collimator, a bank of detectors, electronics to interface to the detectors, and a data acquisition system. The collimator has 10 columns with 36 rows, which are aligned to an array (or arrays) of 360 detectors. The hodoscope provides time and spatial resolution of fuel motion during transients and in-place measurement of fuel distribution before, during, and after an experiment.[15][16] One array of detectors consists of Hornyak Button detectors.[17] The Hornyak Button is a fast neutron detector that consists of a film of ZnS applied to lucite, which together form the 'button'. The button is attached to a photomultiplier tube. This detector shows good efficiency at detecting fast neutrons in a background of thermal neutrons and gamma radiation.[18]

Neutron radiography facility

TREAT has a neutron radiography facility on the west face of the reactor. This allows non-destructive examination of experiment test assembly (or other materials) up to 15 feet in length. TREAT can operate at steady state power levels of up to 100 kW to product neutrons for the radiography facility.[2][14]

Systems

Control rod drive

TREAT has three banks of control rod drive mechanisms, the control/shutdown rods, the compensation/shutdown rods, and the transient rods. There are 4 drive mechanisms in each group. The drive mechanisms are below the reactor, and raise the control rods out of the reactor to increase reactivity. [19] These banks of control rods are arranged in two rings. The inner ring contains four drive mechanisms, the compensation/shutdown rods, with one control rod for each drive mechanism. The outer ring has four control/shutdown drive mechanisms and four transient rod drive mechanisms. The control/shutdown and transient rod drive mechanisms have two control rods for each drive mechanism. All the control rods contain B4C poison sections. The compensation/shutdown and control/shutdown drive mechanisms are mechanical lead screw driven, and have use pneumatic pressure to assist the scram function. The four transient rod drives are hydraulically actuated, and are controlled by the ARCS to control transients. These transient rods move up to 170 in/sec over a total travel of 40 inches (i.e. full 40 inch stroke in about 0.24 seconds).[20]

Restart

On November 14, 2017, the TREAT reactor achieved criticality for the first time since 1994. This was accomplished 12 months ahead of schedule, and about $20 million under budget. This is an important milestone toward the testing of new nuclear fuel, which is expected to begin in 2018.[21][22][23][24][25][26]

Completion of First Fueled Experiment

On September 18, 2018 TREAT completed the first experiment with a small sample of light water reactor fuel.[27][28] [29][30][31]This was a very significant milestone for the TREAT reactor, and is a major step toward one mission of TREAT - validating new accident tolerant nuclear fuel for commercial power plants. The senior Senator from Idaho, Senator Mike Crapo, read the statement below into the Congressional Record.

{{Quote|RECOGNIZING THE TRANSIENT REACTOR TEST FACILITY RESTART

Mr. CRAPO. Mr. President, along with my colleagues Senator James Risch and Representative Mike Simpson, today I wish to call attention to an important event taking place today at the U.S. Department of Energy's, DOE, 890-square-mile site in Idaho. Today, Idaho National Laboratory, INL, personnel ran the first experiments in the Transient Reactor Test, TREAT, facility in nearly a quarter century. 

General reference

Stacy, Susan M. (2000) Proving the Principle: A History of the Idaho National Engineering and Environmental Laboratory, 1949-1999. United States Government Printing. pp. 136, 268. {{ISBN|0160591856}}.

Specific references

1. ^{{Cite journal|title = Global Nuclear Energy Partnership Fuels Transient Testing at the Sandia National Laboratories Nuclear Facilities: Planning and Facility Infrastructure Options.|url = http://www.osti.gov/scitech/servlets/purl/934862|date = 2007-10-01|first = John E.|last = Kelly|first2 = Steven Alan|last2 = Wright|first3 = Veena|last3 = Tikare|first4 = Heather J. (Idaho National Laboratory|last4 = MacLean|first5 = Edward J.|last5 = Parma|first6 = Curtis D.|last6 = Peters|first7 = Milton E.|last7 = Vernon|first8 = Paul S.|last8 = Pickard}}
2. ^1 {{Cite web|title = Fast Reactor Technology - Reactors designed/built by Argonne National Laboratory|url = http://www.ne.anl.gov/About/reactors/frt.shtml|website = www.ne.anl.gov|accessdate = 2015-08-21}}
3. ^{{cite web|title=INL Fact Sheet - Transient Reactor Test Facility|url=http://www4vip.inl.gov/research/transient-reactor-test-facility/|accessdate=2015-07-25}}
4. ^{{cite news|title=Idaho brings nuclear test reactor back to life|url=http://www.washingtontimes.com/news/2014/oct/5/idaho-brings-test-reactor-back-to-life/?page=all|accessdate=7 August 2015|agency=Associated Press|publisher=Associated Press|date=5 October 2014}}
5. ^{{cite news|last1=RAMSETH|first1=LUKE|title=Bringing a nuclear test reactor back to life at INL|publisher=Post Register (Idaho Falls, ID)|date=3 October 2014}}
6. ^{{cite web|title=DOE issues Finding of No Significant Impact for the Environmental Assessment on Resumption of Transient Testing of Nuclear Fuels and Materials at Idaho National Laboratory|url=https://www.energy.gov/em/articles/doe-issues-finding-no-significant-impact-environmental-assessment-resumption-transient|website=US Department of Energy, Office of Nuclear Energy, Initiatives, Nuclear Facility Operations|accessdate=26 July 2015}}
7. ^{{cite web|title=Resumption of Transient Testing|url=https://www.energy.gov/ne/articles/resumption-transient-testing|website=US Department of Energy, Office of Nuclear Energy, Initiatives, Nuclear Facility Operations|accessdate=26 July 2015}}
8. ^{{cite web|url = http://snakeriveralliance.org/treat-restart/|website = Snake River Alliance|accessdate = 7 August 2015|title = TREAT Reactor Restart}}
9. ^{{cite web|title=TREAT nuclear reactor to reopen after 20 years of inactivity|last1=Ballard|first1=Dorothy|url=http://www.pennenergy.com/articles/pennenergy/2014/10/treat-nuclear-reactor-to-reopen-after-20-years-of-inactivity.html|accessdate=25 July 2015|work=PennEnergy|publisher=PennWell|date=2014-10-07|ref=http://www.pennenergy.com/articles/pennenergy/2014/10/treat-nuclear-reactor-to-reopen-after-20-years-of-inactivity.html}}
10. ^{{cite web|title=Development of Light Water Reactor Fuels with Enhanced Accident Tolerance – Report to Congress|url=https://www.energy.gov/ne/downloads/development-light-water-reactor-fuels-enhanced-accident-tolerance-report-congress|website=US DOE|accessdate=10 October 2015}}
11. ^{{cite journal|last1=Gregoire|first1=Tim|title=Topical Meeting Nuclear Fuels and Structural Materials 2016|journal=Nuclear News|date=August 2016|volume=59|issue=9|page=123|publisher=American Nuclear Society, Incorporated|language=English|issn=0029-5574}}
12. ^{{cite web|last1=Heath|first1=Bradley K.|title=Parametric Thermal Models of the Transient Reactor Test Facility (TREAT)|url=http://www.osti.gov/scitech/servlets/purl/1164846|publisher=US Department of Energy|accessdate=8 August 2015}}
13. ^1 {{Cite journal|title = The Reactor Kinetics of the Transient Reactor Test Facility (TREAT)|url = http://www.osti.gov/scitech/servlets/purl/4117807|date = 1960-09-01|first = D.|last = Okrent|first2 = C. E.|last2 = Dickerman|first3 = J.|last3 = Gasidlo|first4 = D. M.|last4 = O'Shea|first5 = D. F.|last5 = Schoeberle|osti = 4117807|id = ANL-6174}}
14. ^1 {{cite web|last1=Carmack|first1=Jon|title=Future Transient Testing of Advanced Fuels|url=http://www.osti.gov/scitech/servlets/purl/978352|publisher=US Department of Energy|accessdate=8 August 2015}}
15. ^1 {{cite web|last1=CRAWFORD|first1=D.C.|last2=SWANSON|first2=R.W.|last3=WRIGHT|first3=A.E.|last4=HOLTZ|first4=R.E.|title=RIA TESTING CAPABILITY OF THE TRANSIENT REACTOR TEST FACILITY|url=http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/30/057/30057719.pdf|website=International Atomic Energy Agency (IAEA)|accessdate=2 September 2015}}
16. ^{{cite web|last1=Rhodes|first1=E.|last2=DeVolpi|first2=A.|last3=Fink|first3=C.|last4=Stanford|first4=G.|last5=Pecina|first5=R.|last6=Travis|first6=D.|last7=Kash|first7=R.|title=TREAT FAST-NEUTRON HODOSCOPE: IMPROVEMENTS IN TIME AND MASS RESOLUTION OF FUEL MOTION|url=http://www.osti.gov/scitech/biblio/6786663-treat-fast-neutron-hodoscope-improvements-time-mass-resolution-fuel-motion|website=OSTI|publisher=US DOE|accessdate=9 October 2015}}
17. ^{{cite book|last1=DeVolpi|first1=A.|last2=Fink|first2=C.L.|last3=Marsh|first3=G.E.|last4=Rhodes|first4=E.A.|last5=Stanford|first5=G.S.|title=FAST-NEUTRON HODOSCOPE AT TREAT: METHODS FOR QUANTITATIVE DETERMINATION OF FUEL DISPERSAL|date=1980|publisher=Argonne National Lab|url=http://www.osti.gov/scitech/servlets/purl/1130757|osti=1130757|accessdate=18 October 2015}}
18. ^{{Cite journal|title = A Fast Neutron Detector|url = http://www.osti.gov/scitech/servlets/purl/4396836|date = 1951-10-17|first = W. F.|last = Hornyak|osti = 4396836|access-date = 2015-10-18}}
19. ^{{Cite journal|last=Bess|first=John Darrell|last2=DeHart|first2=Mark David|date=2015-10-01|title=Baseline Assessment of Treat for Modeling and Analysis Needs|url=http://www.osti.gov/scitech/servlets/purl/1240047|language=English|publisher=Idaho National Laboratory (INL), Idaho Falls, ID (United States)}}
20. ^{{Cite journal|last=Wade|first=D. C.|last2=Bhattacharyya|first2=S. K.|last3=Lipinski|first3=W. C.|last4=Stone|first4=C. C.|date=1982-01-01|title=Core Design of the Upgraded Treat Reactor|url=http://www.osti.gov/scitech/servlets/purl/6345682|language=English|publisher=Argonne National Lab., IL (USA)}}
21. ^{{Cite web|url=https://www.energy.gov/articles/doe-national-laboratory-resumes-operation-us-transient-test-reactor|title=DOE National Laboratory Resumes Operation of U.S. Transient Test Reactor|website=Energy.gov|access-date=2017-12-01}}
22. ^{{Cite web|url=https://www.environmentguru.com/pages/elements/element.aspx?id=5742354|title=Test Reactor Restarts at Idaho National Laboratory|last=Energy|first=Department of|access-date=2017-12-01}}
23. ^{{Cite news|url=http://www.krmg.com/news/restarts-nuclear-testing-facility-idaho-after-years/BQvTVNE5ZJpemsitJxqaOI/|title=US restarts nuclear testing facility in Idaho after 23 years {{!}} Tulsa's 24-Hour News, Weather and Traffic|work=KRMG Radio|access-date=2017-12-01|language=en}}
24. ^{{Cite web|url=http://www.elp.com/articles/2017/11/us-restarts-treat-nuclear-testing-facility-in-idaho-after-23-years.html|title=US restarts TREAT nuclear testing facility in Idaho after 23 years|website=www.elp.com|access-date=2017-12-01}}
25. ^{{Cite web|url=http://www.neimagazine.com/news/newsus-restarts-unique-test-reactor-5981625|title=US restarts unique test reactor - Nuclear Engineering International|website=www.neimagazine.com|access-date=2017-12-01}}
26. ^{{Cite web|url=http://www.world-nuclear-news.org/RS-US-test-reactor-resumes-operations-1611177.html|title=US test reactor resumes operations|website=www.world-nuclear-news.org|access-date=2017-12-01}}
27. ^{{Cite web|url=https://www.inl.gov/article/inls-treat-reactor-successfully-completes-first-fueled-experiment/|title=INL’s TREAT reactor successfully completes first fueled experiment {{!}} INL|website=www.inl.gov|language=en-US|access-date=2018-10-28}}
28. ^{{Cite web|url=https://www.energy.gov/ne/articles/idaho-national-laboratory-completes-first-fueled-experiment-us-transient-test-reactor|title=Idaho National Laboratory Completes First Fueled Experiment in U.S. Transient Test Reactor|website=Energy.gov|language=en|access-date=2018-10-28}}
29. ^{{Cite news|url=https://www.idahostatejournal.com/news/local/inl-test-reactor-revived-with-first-experiment-in-decades/article_12e37243-e9d2-5d2e-8bdc-195057a50978.html|title=INL test reactor revived with first experiment in decades|last=nbrown@postregister.com|first=By NATHAN BROWN|work=Idaho State Journal|access-date=2018-10-28|language=en}}
30. ^{{Cite web|url=http://www.world-nuclear-news.org/Articles/Restarted-US-reactor-completes-first-fuel-test|title=Restarted US reactor completes first fuel test - World Nuclear News|website=www.world-nuclear-news.org|access-date=2018-10-28}}
31. ^{{Cite news|url=https://www.localnews8.com/news/treat-reactor-conducts-first-fueled-experiment/797239706|title=TREAT reactor conducts first fueled experiment|last=Writer|first=Staff|date=2018-09-19|work=KIFI|access-date=2018-10-28|language=en-US}}
32. ^{{Cite web|url=https://www.congress.gov/congressional-record/2018/09/18/senate-section/article/S6219-2|title=Congressional Record|website=www.congress.gov|language=en|access-date=2018-10-28}}

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