ML19339B932

LER 80-061/03X-1:on 800825,surveillance Testing,Initiated Because of HPCI Sys Failure,Determined That a Loop of Core Spray Sys Was Inoperable.Caused by Core Spray Valve Mo 1400-24A Being Partially Stuck Open

ML19339B932
Person / Time
Site:	Pilgrim
Issue date:	10/27/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339B931	List: ML19339B930 ML19339B932
References
LER-80-061-03X, LER-80-61-3X, NUDOCS 8011100455
Download: ML19339B932 (1)

Text

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? 8 60 61 DOCKET NUM8ER EVENT DESCRIPTION AND PROSABLE CCNSEQUENCES b lo l2l 10n August 25,1980 at approximate 1v 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> durine surveillance testing the Core SpravI g

System was determined to be inoperable. The HPCI system was out of service at the tirp.

,,,,,, Following the successful testing of Core Spray Valve MD 1400-25A, Core Spray Valve l

,,,,,, 10 1400-24A was determined to be inoperable. An orderly shutdown was initiated and l terminated at 1440 hours0.0167 days <br />0.4 hours <br />0.00238 weeks <br />5.4792e-4 months <br /> the same day after the Cure Spray Valve MO 1400-24A was i

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g,,, y manually placed in the open position. Valve MD 1400-24A was repaired, tested and l declared operabic at approximately 0955 hours0.0111 days <br />0.265 hours <br />0.00158 weeks <br />3.633775e-4 months <br /> on August 27, 1980. i 80 E o0E $ SC E COMPONENT CcOE SU8Cc0'E SU E loIsl 7 8

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BOSTON EDISON COMPANY PILGRIM UUCLEAR POWER STATION DOCKET No. 50-293 Attachment to LER 80-061/03X-1 Description On August 25, 1980 at approximately 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> surveillance testing, which was initiated because of failure of the HPCI system, determined that the ' A' loop of the Core Spray System was inoperable. During this surveillance testing, fol-lowing the successful testing of Core Spray Valve MO 1400-25A Core Spray Valve FD 1400-24A failed in a partially open position.

An orderly shutdown was immediately initiated as required by Technical Specifi-cation Section 3.5.C.3. The shutdown was terminated at approximately 1440 hours0.0167 days <br />0.4 hours <br />0.00238 weeks <br />5.4792e-4 months <br /> on August 25, 1980 after Core Spray Valve MD 1400-24A was opened and electri-cally disabled.

Corc Spray Valve MD 1400-24A was repaired, tested and declared operable at ap-proximately 0955 hours0.0111 days <br />0.265 hours <br />0.00158 weeks <br />3.633775e-4 months <br /> on August 27, 1980.

Cause & Corrective Action On August 25, 1980 maintenance and operations personnel inspected Core Spray Valve MD 1400-24A and found it stuck in a partially open position. Attempts to manually open it were difficult therefore it was decided to electrically close it in an effort to release its bound state. This closing action appeared to eliminate thg restriction to valve movement. The valve was opened and electri-cally disabled until maintenance could verify its operation On August 27, 1980 maintenance personnel after lubricating the valve's stem verified the electrical operation of the valve. Current readings taken before and after lubrication measured 17 and 9 amperes respectively. The valve operator's torque switch trips at a current of approximately 10-12 amperes. The valve was satisfactorily timed, functionally tested, and declared operable at approximately 0955 hours0.0111 days <br />0.265 hours <br />0.00158 weeks <br />3.633775e-4 months <br /> the same day.

Maintenance, additionally, has recommended that the valve be scheduled for in-spection during the next refueling outage.

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