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This report is issued irregularly. Inquiries about availability of the reports should be addressed to Research Information Division, Department of Intellectual Resources, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken T319—1195, Japan.
©Japan Atomic Energy Research Institute, 2003 JAERI-Tech 2003-028
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Measurements of Power Profile in TRACY Supercritical Experiment by Detecting Epithermal Neutrons
Ken NAKAJIMA, Hiroshi YANAGISAWA+ and Yoshinori MIYOSHI
Department of Fuel Cycle Safety Research Nuclear Safety Research Center Tokai Research Establishment Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken
(Received January 31,2003)
We have tried to measure the power profile in the TRACY supercritical experiment with high accuracy by detecting epithermal neutrons. In order to measure the epithermal neutrons, a cadmium covered 235U fission chamber was used, and a neutron moderator of polyethylene, was set inside the cadmium to enhance the neutron detection efficiency. In addition, a lead shield was used to reduce the noise current due to gamma-rays. The measured results were compared with the ones using a thermal neutron detector, and it was found that the time delay effect in the thermal neutron detection, which was caused by the flight time of neutrons to reach the detector, distorted the power profile and reduced its peak value. The reduction ratio of peak power was about 4% for the relatively slow power change with the inserted reactivity of 1.5$, but it became more than 40% for the rapid power change with the reactivity of about 3$.
Keywords: TRACY, Power Profile Measurements, Epithermal Neutron Detection, 235U Fission Chamber, Gamma-ray Shield, Time Delay Effect, Peak Power Reduction
+ Department of Safety Research Technical Support
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Contents
1 . Introduction 1 2 . Effect of Neutron Filters 3 2.1 Outline 3 2.2 Measurements of Filter Effect 3 2.3 On the Power Oscillation 5 2.4 Summary 6 3 . Results of Power Profile Measurement by Detecting Epithermal Neutrons 15 3.1 Outline 15 3.2 Results of Measurement 15 3.3 Summary 16 4 . Summary 24 References 24 Appendix 1: Outline of TRACY 26 Appendix 2: List of Experiments 28 Appendix 3: Measurement Conditions of Epithermal Neutron Detection System 29
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P. McLaughlin et al., A Review of Criticality Accidents, 2000 Revision, LA-13638, Los Alamos National Laboratory (2000). 2) H. Yanagisawa, K. Nakajima, K. Ogawa et al., "Experiments on Transient Behavior of a Low-Enriched Uranyl Nitrate Solution System with TRACY to Study Hypothetical Criticality Accidents in Reprocessing Plants," Proc. Sixth Int. Conf. on Nuclear Criticality Safety, September, Versailles, France, p.900 (1999). 3) ##£#, /WU», ffiSUt- m, TTRACY ©aifeia^J , JAERI-Tech 2002-031, 0# MJ-JjQtftW (2002). - 24 - JAERI-Tech 2003-028 4) K. Nakajima, Y Yamane, K. Ogawa et al., TRACY Transient Experiment Databook, 1) Pulse Withdrawal Experiment, JAERI-Data/Code 2002-005, Japan Atomic Energy Research Institute (2002). 5) K. Nakajima, Y Yamane, K. Ogawa et al., TRACY Transient Experiment Databook, 2) Ramp Withdrawal Experiment, JAERI-Data/Code 2002-006, Japan Atomic Energy Research Institute (2002). 6) K. Nakajima, Y Yamane, K. Ogawa et al., TRACY Transient Experiment Databook, 3) Ramp Feed Experiment, JAERI-Data/Code 2002-007, Japan Atomic Energy Research Institute (2002). 7) H. Yanagisawa, A. Ohno, K. Ogawa et al., "Time Delay of thermal Neutron Detection during Power Burst in TRACY,"/. Nucl. Sci. Technol., 38[8], 591 (2001). 8) H. Yanagisawa and A. Ohno, "Evaluation of Power History during Power Burst Experiments in TRACY by Combination of Gamma-Ray and Thermal Neutron Detectors," J. Nucl. Sci. Technol., 39[6], 597 (2002). 9) mmfcm, mmmn&%(DRfom®xftfirt-7>hmmz&tt%ititimmRzsft7m M&mmvwmizM'rmni, &^m±¥±¥&j:¥wmm±wz% 2002 ¥ 1 n (2002). 10) H. Yanagisawa, A. Ohno and E. Aizawa, "Determination of Gamma-Ray Exposure Rate from Short-Lived Fission Products under Criticality Accident Conditions," J. Nucl. Sci. Technol, 39[5], 499 (2002). 11) T. Nakagawa, K. Shibata, S. Chiba et al., "Japanese Evaluated Nuclear Data Library Version 3 Revision-2: JENDL-3.2,"/. Nucl. Sci. Technol, 32[12], 1259 (1995). 12) H. Yanagisawa, K. Nakajima, A. Ohno et al., "Evaluation of Photon Shielding Capability for Epithermal Neutron Detection during Reactivity-Initiated Power Burst Experiments," J. Nucl. Sci. Technol, 39[7], 800 (2002). - 25 - JAERI-Tech 2003-028 TO 1 : TRACY v*<„ && TRACY ©^kte, #M>^ > Mfjfcfan- BOM m«>m £i Tvi5. *P^>^MT£I$ ttSSjffl^tt^JH (Am-Be) # A-l TRACY ZEj^iM - 26 - JAERI-Tech 2003-028 0\ZlZ-oX^Z>. lara^^^^, «*f$cm^7)u«, ^^cstsnT^s. ^©a ^>^TSI5JS®f'l»«^*l^iKiSfi$nTV^a^, ^^^iLTlO^^©^^^ •HTsy-tyRWfP'bzyv^z. '<>vfi7sV>7'v>>fWLmttwtM-£nx^z>. mmm NOx #X*££©fi!££fT"5. - 27 - JAERI-Tech 2003-028 TO 2 :££-* *WSrSl;*viT^JfiLfcj@BS^^gftO*fr-KSg A-l i&tf A-2 JC^-T. ^©fit^Kte, A-l ^ifc£#-f£ (Sg2*: 7 4)l#-$bm A-2 mm-w. 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