ML19323G079

LER 80-016/03L-0:on 800513,while Performing Surveillance Test,Core Spray Pump P215B Failed to Start & Core Spray Valve 14000-24B Failed to Automatically Open.Caused by trip-free Operation & Dirty Contact in Logic Circuit

ML19323G079
Person / Time
Site:	Pilgrim
Issue date:	05/23/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19323G074	List: ML19323G073 ML19323G079
References
LER-80-016-03L, LER-80-16-3L, NUDOCS 8005300348
Download: ML19323G079 (2)

Text

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REPORT DATE 7 8 4 61 DOCKET NUMBER 68 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l On May 13, 1980 while performing surveillance test number 8.M.3-1 entitled " Simulated l

[777]l Auto Inf tiation of Diesel Generators" Core Spray Pump P215B failed to start and l 1014 l l core spray valve 1400-24B failed to automatically open. (Refer to Attachment) l 10151 1 I 10161l I f0TIl l l 10181I l 7 8 9 80 DE CODE S SC E COMPON ENT CODE SUSCOdE S E 10191 l S l F l@ y@ l A l@ l Zl Zl Zl Zl Zl Zl@ l Zl@ W @ 18 19 20 7 8 9 to 11 12 13 SEQUENTIAL OCCURRENCE REPORT REVISION

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42 43 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li l0 l l Core Spray Pump P-215B did not start because of its breaker number 152-607 exoerienced gl a trip free operation. A Plant Design Change Request No.77-115 is addressine this 1 11 12 I l operation which was previously reported in LER 77-40. I gl Valve 1400-24B did not automatically open because of a dirty contact in its logic l gl circuit. l 7 8 9 80 Si  % POWER OTHER STATUS DIS RY DISCOVERY DESCRIPTION ITTs* l W@ l 01 01 01 @ l N.A. l l B l@l Routine Surveillance Test l AETiviTY CO0 TENT RELEASED OF RELEASE AMOUNTOF ACTIVITY LOCATION OF RELEASE W l,,Z_j 7 8 9

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NAME OF PREPARER PHON E:

BOSTON EDISON COMPANY PILGRIM NUCLEAR POWER STATION DOCKET NO. 50-293 Attachment to LER 80-016/03L'O Description On May 13, 1980 while performing surveillance test number 8.M.3-1 entitled

" Simulated Auto Initiation of Diesel Generators", Core Spray Pump P-215B failed to start and Core Spray valve 1400-24B failed to automatically open. On the same day, following a procedure change, the test was repeated with the Core Spray Pump automatically starting. On the following day valve 1400-24B opening -

circuit was adjusted by Station I&C personnel, tested and returned to service.

At the time of the test neither the core spray nor the LPCI systems were required to be operable.

Cause and Corrective Action Core Spray Pump P215B did not start because its breaker number 152-607 ex-perienced a trip free operation. The trip free operation resulted from a timing sequence in which the test initiating signals play a vital part. A procedure change was made to procedure number 8.M.3-1 prior to the test being repeated.

The procedure change, which instructed that an existing test switch in the logic circuit be utilized, altered the logic circuits timing and eliminated the trip free operation during the test. A plant design change request number 77-115 is addressing a permanent resolution to this problem. A detailed report on this trip free operation was previously issued on December 12, 1977 in LER 77-40.

During the performance of the test valve 1400-24B did not open. The auto-matic opening of this core spray discharge valve was prevented by a dirty contact in its final actuating relay, 14A-K13B. The relay is a G.E. Model No.

12HEA51A42F. The contact was cleaned, the relay and valve operationally tested and the valve returned to service. As a result of this event, a review of all similar ECCS circuits is being performed to ensure that the final actuating contacts in valve logic circuits are periodically tested and capable of performing their intended function.

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