ML20117L095

Univ of Missouri Research Reactor Operations Monthly Summary for Feb 1996

ML20117L095
Person / Time
Site:	University of Missouri-Columbia
Issue date:	03/13/1996
From:	MISSOURI, UNIV. OF, COLUMBIA, MO
To:
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References
FOIA-96-249 NUDOCS 9609120315
Download: ML20117L095 (3)

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e 1 UNIVERSITY OF MISSOURI RESEARCH REACTOR  ;

OPERATIONS MONTHLY

SUMMARY

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February 1996 Prepared by:

Operations Staff 9609120315 96082G PDR FOIA WALSH96-249 PDR flhg31N' [/3 k

February 1996 The reactor operated continuously in February with t.he following exceptions: four shutdowns for scheduled maintenance and refueling.

On February 5,1996, after shutting down the reactor for a regularly scheduled maintenance day, the control room operator found that anti-siphon valve V543A failed to open as expected while securing the primary system. The redundant anti-siphon valve V543B opened as expected.

The air operator for V543A had not cycled, which indicated a failure ofits three-way solenoid valve to operate normally to vent the air operator and allow spring force to open V543A.

Compliance testing of the anti-siphon system was performed to verify that V543B was operable. This test verified that the siphon break system was operable as required in Technical Specification 3.9.a.

The failure of the three way solenoid valve for V543A was investigated by the Reactor Manager to determine if the previous week's maintenance on this solenoid had bean performed correctly. A new seal kit had been installed and was verified to be installed correctly. Subsequent rebnikling of ne s the solenoid valve on February 5 resulted in the valve failing to vent after several successful cycles of operat. ion. The entire three-way solenoid for V543A was replaced. Valve 543A was cj' eled successfully over twenty times. Compliance testing was completed to verify that both anti-siphon valves were operable prior to resuming reactor operation. Subsequent testing of the three-way i solenoid valve indicated an 0-ring seal problem associated with the operating piston in the valve.

This operating piston will be discarded.

Details of the failure and corrective actions were reviewed by the Reactor Action Subcommittee on February 12,1996. The details will be reviewed by the full Safety Subcommittee at the next meeting.

Major maintenance for the month included: re-installing old G and H graphite wedges; replacing the shear pins on the personnel airlock doors; replacing the leading trolley hanger bolt and tensioning spring on the inner personnel airlock door, a

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OPERATION SUMMAR t

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MOURS OPERATED THIS PERIOD 645

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"OTAL HOURS OPERATED 194,214

60URS AT FULL POWER TIIIS PERIOD 643 TOTAL HOURS AT FCLL POWER 191,212 i INTEGRATED POWER THIS PERIOD. 268 MWD i i

TOTAL INTEGRATED POWER 73,820 MWD '

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j MAINTENANCE ACTIVITIES 2/5/96 Refueled - removed core 96-6, loaded core 96-7. Reinstalled old G and H graphite

Wedges; replaced ^T<e 543A solenoid valve.

• 2/12/96 Refueled - removed core 96-7, loaded core 96-8.

4 2/19/96 Refueled - removed core 96-8, loaded core 96-9. Replaced.the shear pins on the personnel l l ' airlock doors. i i

2/26/96 Refueled - removed core 96-9, loaded core 9610. Replaced the leading trolley hanger bolt i 4

and tensioning spring on the inner personnel airlock door.

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