ML20154M343

Monthly Operating Rept for Jul 1998 for Univ of Missouri Research Reactor

ML20154M343
Person / Time
Site:	University of Missouri-Columbia
Issue date:	07/31/1998
From:	MISSOURI, UNIV. OF, COLUMBIA, MO
To:
Shared Package
ML20154M334	List: ML20154M330 ML20154M340 ML20154M343
References
NUDOCS 9810200242
Download: ML20154M343 (2)

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UNIVERSITY OF MISSOURI RESEARCH REACTOR

OPERATIONS MONTHLY

SUMMARY

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T JULY 1998 4

Prepared by:

Operations Staff 1

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9810200242 980930 PDR ADOCK 05000186 R PDR SEP 01 M

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July 1998

'Ihe reactor operated continuously in' July with the following exceptions: four shutdowns for scheduled maintenance and refueling. There were no unscheduled shutdowns this month. I a

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During the July 6th maintenance day shutdown, operators discovered a sample loading height i discrepancy in the flux trap sample holder. One of the three tubes of the flux trap sample holder

[ had one inch of unoccupied volume. This was considered to be a violation of Technical Specification

. _3.6.e concerning the operation of the reactor with a subpart of an experiment not rigidly held in place. This error was discovered to have occurred during the loading of the flux trap on the previous maintenance day (June 30) and was due to a loading sheet error which listed a sample as being l

! 3 inches long when in fact it was 2 inches long. The circumstances and remediation of this event are

described in a license event report submitted to the U.S. Nuclear Regulatory Commission on August 6,1998.

l Other activities: A series of suberiticality measurements were done using fresh and spent MURR fuel elements. These measurements were conducted by personnel from Westinghouse I (Savannah River Site) and Oak Ridge National Laboratory. Fresh fuel measurements were done in

a water tank outside the reactor pool and spent fuel measurements were done in the weir area of the pool. Westinghouse experimenters are trying to benchmark reactivity predictions from code  !

calculations with these measurements.

a OPERATIONS

SUMMARY

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HOURS OPERATED THIS PERIOD 669 TOTAL HOURS OPERATED 213,274 HOURS AT FULL POWERTHIS PERIOD 667 TOTAL HOURS AT FULL POWER 210,170 INTEGRATED POWER THIS PERIOD 278 MWD  ;

TOTAL INTEGRATED POWER 81,723 MWD MAINTENANCE ACTIVITIES 07/06/98 Refueled - removed core 98-33, loaded core 98-34.

07/13/98 Refueled - removed core 98-34 loaded core 98-35.

07/20/98 Refueled - removed core 98-35, loaded core 98 36.

07/27/98 Refueled - removed core 98-36, loaded core 98-37.