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Category:Letter
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U.S. Nuclear Regulatory Commission Routine Inspection Report No. 05000027/2022201 ML22242A3062022-08-30030 August 2022 Washington State University Modified Triga Reactor - 2022 Annual Report for the Wsu Nuclear Science Center ML22137A1022022-06-0606 June 2022 Examination Confirmation Letter No. 50-27/OL-22-01, Washington State University IR 05000027/20212012021-08-27027 August 2021 Washington State University - U.S. Nuclear Regulatory Commission Routine Safety Inspection Report No. 05000027/2021201 ML21228A1322021-08-16016 August 2021 2021 Annual Report for the Wsu Nuclear Science Center ML20295A4242020-11-16016 November 2020 Notification of Mailing Address Change Regarding Submittal of Fingerprint Cards ML20258A0312020-09-14014 September 2020 Examination Confirmation Letter No. 50-027/OL-21-01, Washington State University IR 05000027/20202012020-08-24024 August 2020 Washington State University - U.S. Nuclear Regulatory Commission Routine Inspection Report No. 05000027/2020201 ML20045D7822020-02-14014 February 2020 Washington State University Modified Triga Reactor: Nuclear Science Center Emergency Plan Updates - Summary of Changes (Revision 1/2020) ML20027C5532020-01-27027 January 2020 Washington State Univ., License Amendment Request (Supplemental) - Nuclear Radiation/Science Center Name Change and Removal of Primary Coolant Ph Specification ML19273A9412019-09-30030 September 2019 Washington State University, License Amendment Request - Nuclear Radiation/Science Center Name Change and Removal of Primary Coolant Ph Specification ML19246C1622019-09-0303 September 2019 Washington State University Modified Triga Reactor - Change to Level 2 Management in the Facility Organization IR 05000027/20192012019-08-30030 August 2019 Washington State University - U.S. Nuclear Regulatory Commission Routine Inspection Report No. 50-027/2019-201 ML19235A0592019-08-20020 August 2019 Submittal of the 2019 Annual Report for the Wsu Nuclear Science Center ML19210D9652019-07-30030 July 2019 Examination Report No. 50-027/OL-19-01, Washington State University ML19204A2042019-07-29029 July 2019 Washington State University - 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Response to Part 71 Quality Assurance Program Approval Biennial Change Report ML17237A0522017-08-22022 August 2017 Washington State University Submittal of Annual Operating Report for the Period July 1, 2016 Through June 30, 2017 IR 05000027/20172012017-08-17017 August 2017 Washington State University - U.S. Nuclear Regulatory Commission Routine Inspection Report 05000027/2017201 ML17181A2032017-07-0606 July 2017 Examination Report No. 50-027/OL-17-01, Washington State University ML17067A4042017-04-17017 April 2017 Washington State University GL 2016-01 Closeout Form Letter for Rtrs with No Credited NAM ML17073A0072017-03-16016 March 2017 Examination Confirmation Letter, 50-027/OL-17-01, Washington State University ML16321A4042016-11-0707 November 2016 Washington State University Response to Generic Letter 2016-01: Monitoring of Neutron-Absorbing Materials in Spent Fuel Pools ML16266A2142016-10-25025 October 2016 Request for Withholding Information from Public Disclosure for the Virgil C. 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Summer LAR 15-17, Addition of Two New Turbine Building Sump Pumps to ITAAC ML15223A4382015-08-0707 August 2015 Washington State University - Annual Report for Operating Period July 1, 2014 Through June 30, 2015 ML15217A4932015-07-28028 July 2015 Letter from Donald Wall Reportable Occurrence Involving Release of Fission Products Into Environment ML15182A2612015-07-21021 July 2015 Examinantion Report 50-027/OL-15-02 Washington State University 2024-01-03
[Table view] Category:Startup Test Report
MONTHYEARML1010406992010-04-0808 April 2010 Washington State University, Submittal of Start Up Report Close-Out 2010-04-08
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WASHINGTON STATE r3UNIVERSITY Nuclear Radiation Center April 8, 2010 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
Reference:
Washington State University Docket No. 50-27, License No. R-76
Subject:
Start Up Report Close-out Included with this cover letter is a description of the reactivity loss as a function of temperature measurements made at WSU, along with discussion of reactor physics measurements.
The information that is included with this letter is intended to finalize any outstanding issues connected with the start up report of April 17, 2009.I declare under penalty of perjury that the foregoing is true to the best of my knowledge.
Executed on " O44 , .2 0 10 Respectfully Submitted,' D' 01aU wagQ Donald Wall, Ph.D.Director Cc: Region IV Office Linh Tran Frank DiMeglio Ao~D AI~2 Y~P.O. Box641300, Pullman, WA 991 64-1 300 509-335-8641
- www.wsu.edu/nrc Start up Report Closeout Washington State University converted its TRIGA research reactor from HEU to LEU fuel in 2008. The reactor returned to steady-state operation during October 2008. The reactor was operated on a regular basis between October 2008 and April 2009 to allow the buildup of 1 4 9 Sm in the new fuel to reach a steady-state concentration, which was deemed necessary to fully carry out pulse testing of the reactor. Pulsing limits were determined, and the reactor was returned to normal operation as of April 13, 2009. A Startup Report for the Washington State University Nuclear Radiation Center TRIGA Reactor was submitted to the U.S. NRC on April 17, 2009. The U.S. NRC provided an"OUTLINE OF REACTOR STARTUP REPORT' as Attachment 2 of the "ISSUANCE OF ORDER MODIFYING LICENSE NO. R-76 TO CONVERT FROM HIGH- TO LOW-ENRICHED URANIUM FUEL (AMENDMENT NO. 20) -WASHING TON STATE UNIVERSITY TRIGA REACTOR (TAC NO. MD6570) which was issued on September 4, 2008 (EA-08-250).
The Outline of Reactor Startup Report contained requirements for contents of the startup report. The Startup Report that was submitted on April 17, 2009 followed the outline, as stipulated by the U.S. NRC, but also included the statement that further information regarding thermal neutron flux distributions and reactor physics measurements would be provided in the WSU annual report. The two pertinent items in the Outline of Reactor Startup Report are Items 6 and 7: 6. Thermal neutron flux distributions Measurements of the core and measured experimental facilities (to the extent available) with HEU and LEU and. comparisons with calculations for LEU and if available,,, H.EUi 7. Reactor physics measurements Results of determination of LEU effective delayed neutron fraction, temperature coefficient, and void coefficient to the extent that measurements are possible and comparison with calculations and available HEU core measurements.
Closeout of items 6 and 7 was not carried out in the annual report due to unexpected difficulties that were encountered during the course of attempting to gather the relevant data.Thermal neutron flux distributions There are no data available for experimental measurement of thermal neutron flux distributions for the HEU core. Thermal flux values for the irradiation position D8 for the LEU core were measured and provided in the startup report. The WSU reactor was originally an MTR fueled reactor, which was converted to TRIGA fuel by use of lower grid plate adapters to accommodate TRIGA fuel elements.
Due to the geometry imposed-by the arrangements of the fuel assemblies in the WSU reactor, WSU has 1 of 3 attempted td, but not been able to develop or fabricate a means to measure in-core neutron fluxes.Reactor physics measurements WSU has attempted to measure the effective delayed neutron fraction within the LEU fueled reactor, but has been unable to generate data of sufficient quality. WSU does not have the means to measure the void coefficient within the reactor. WSU has measured the reactivity loss as a function of temperature to determine the magnitude of the negative temperature coefficient.
Results are presented in Figure 1.1.40E-04 1.20E-04""' 1.00E-04 8.OOE-0o _-*Calculated PNTC 6.OOE-05 " Measured reactivity loss 4.00E' 0)2.OOE-05 0.OOE+00 ....0 200 400 600 800 1000 Average fuel temperature (degrees C)Figure 1. Reactivity loss as a function of core average fuel temperature.
The calculated values presented in Figure 1 are taken from the Conversion Safety Analysis report of August 2008. The values are for Core 35A at Beginning of Life.Since Figure 1 presents the data as Reactivity Loss, the y-axis values are positive.
In other words, the y-axis values indicate a decrease in core reactivity as a function of temperature.
The measured values were determined by operating the reactor at different power levels, corresponding to different fuel temperatures, and determining both average fuel temperatures and reactivity losses by consulting reactor control blade calibration data tables. The scatter in the data (particularly the data point at 30 0C) can be explained by uncertainty in correlation of measured fuel temperatures with core average temperatures.
Nevertheless, it is clear that the WSU TRIGA Core 35A exhibits a pronounced reactivity loss as the fuel temperature rises. The experimentally measured data points terminate at core average temperature of 285 0C because the reactor had reached full power (1.0 megawatt), and so it is not possible to measure reactivity loss at higher core average temperatures.
2 of 3 Summary Items 6 and 7 in Attachement 2 of ISSUANCE OF ORDER MODIFYING LICENSE NO.R-76 TO CONVERT FROM HIGH- TO LOW-ENRICHED URANIUM FUEL (AMENDMENT NO. 20) -WASHING TON STATE UNIVERSITY TRIGA REACTOR (TAC NO. MD6570) request data to the extent that either the data are available, or to the extent that measurements are possible.
WSU has provided irradiation position thermal neutron flux measurements, and herein also provides temperature coefficient data. However, WSU has not been able to measure either the delayed neutron fraction or void coefficient.
Accordingly, WSU submits this letter with the intent to finalize the issues from the start up report, and requests that the NRC consider the issues closed.3. of 3