ML20117L084

Univ of Missouri Research Reactor Operations Monthly Summary for Jan 1996

ML20117L084
Person / Time
Site:	University of Missouri-Columbia
Issue date:	03/06/1996
From:	MISSOURI, UNIV. OF, COLUMBIA, MO
To:
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ML20117K785	List: ML20117K791 ML20117K795 ML20117K799 ML20117K820 ML20117K826 ML20117K829 ML20117K832 ML20117L031 ML20117L045 ML20117L047 ML20117L056 ML20117L073 ML20117L081 ML20117L084 ML20117L086 ML20117L090 ML20117L095 ML20117L100 ML20117L109 ML20117L116
References
FOIA-96-249 NUDOCS 9609120312
Download: ML20117L084 (3)

Text

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UNIVERSITY OF MISSOURI RESEARCH REACTOR '

OPERATIONS MONTHLY SUMMAP.Y i

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l January 1996 Prepared by:

Operations Staff 960912o312 960828 PDR FOIA PDR MQ g

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January 1996 The reactor operated continuously in January with the following exceptions: five shutdowns for scheduled maintenance and refueling; one unscheduled shutdown.

On January 23, a manual scram was initiated by the console reactor operator upon discovering that the regulating blade was not operating properly. Electronics technicians discovered, and replaced, a bad bearing in the gearbox input shaft coupling. The regulating blade was tested satisfactorily, and returned to normal operation. A Licensee Event Report was written regarding this failure which involved non-compliance with Technical Specification 3.2.a, which states, "All control blades, including the regulating blade, shall be operable during reactor operation."

On January 29, during scheduled maintenance with the reactor shutdown, one of two redundant anti-siphon valves (V543A) was found to be inoperable. Compliance testing of the anti-siphon system was performed to verify the redundant valve (V543B) was operable. This test verified that the siphon break system was operable as required by Technical Specification 3.9.a.

Operability of the siphon brc cestem is also verified at uch reactor startup as part of the startup procedure for the primary system.

Special Maintenance Procedure, SMP-10 was performed to investigate the V543A failure. The cause of failure was a missing pin connecting the valve stem to the actuating linkage. The valve was removed, rebuilt and tested, and returned to the system. A new pin with a keeper assembly was installed to ensure the pin could not work its way out of the adaptor. This pin had previously been staked into place. The adaptor pin for the redundant valve, V543B was inspected to ensure a similar problem with it was not occurring.

Details of the valve failure and corrective actions were reviewed by the Action Subcommittee (a subset of the Safety Subcommittee) on February 12,1996. These details will be reviewed by the full Safety Subcommittee at the next meeting.

Other major maintenance items for the month included: replacing the bearingin the input shaft coupt ing gearbox of the regulating blade; installing a south pneumatic tube terminal in graphite wedge #3; installing new 'G' and 'H' graphite wedges.

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UNSCIIEDULED SHUTDOWNS l Dain Number Tyne Cause 1/23/96 1046 Manual Scram Regulating blade drive gearbox bearing failure. ,

OPERATION

SUMMARY

HOURS OPERATED THIS PERIOD 650 TOTAL HOURS OPERATED 193,569 f

HOURS AT FULL POWERTHIS PERIOD 648 f TOTAL HOURS AT FULL POWER 190,569 INTEGRATED POWER THIS PC.RIOD 270 MWD

) TOTAL INTEGRATED POWER 73,551 MWD ,_,., .

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MAINTENANCE ACTIVITIES 1/2/96 Refueled - removed core 95-58, loaded core 96-1. Replaced the open indication microswitch on valve 543A (anti-siphon); replaced the roll pin in the gearbox input drive shaR coupling.

1/8/96 Refueled - removed core 96-1, loaded core 96-2.

j 1/16/96 Refueled - removed core 96-2, loaded core 96 3.

i 1/22/96 Refueled - removed core 96-3, loaded core 96-4.

4 1/23/96 Refueled - removed core 96-4, loaded core 96-5 Replaced bearing in input shaft coupling

! gearbox of the regulating blade.

l 1/29/96 Refueled - rea.oved core 96-5, loaded core 96-6. Installed south p-tube terminal in graphite l wedge #3;in-talled new 'G' and 'H' graphite wedges. Performed SMP-10, Valve 543 A/B maintenance, t. investigate problem with V543A and repair.

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