ML20064F253

LER#78-113/03l-0 on 780927:after maint,TV-BD100A,B,D & F Were Tested But Not Timed Prior to Return to Svc,Due to Personnel Error.Personnel Have Reviewed the Requirements

ML20064F253
Person / Time
Site:	North Anna
Issue date:	11/17/1978
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20064F229	List: ML20064F225 ML20064F235 ML20064F241 ML20064F253
References
LER-78-113-03L, LER-78-113-3L, NUDOCS 7811280330
Download: ML20064F253 (2)

Text

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CON'T IOlil go",T c l L l@l0 l 5 l0 l0 l0 l3 l3 l8 l@l 0l 91217171 B l@l il REPORT 74 73 il il 71 DATE 71 al@ 80 8 60 61 DOCKET NUMBER 68 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 21 l Following maintenance TV-BD100A, B, D and F were functionally tested. but nOt timed i O i 3, j prior to return to service. Probable consequences are minimal since redundant valves !

O#4i lwere available and retest showed that each valve met closina time reauirementt Thic l Oisi lis a violation of T.S. 4.6.3.1.1.b and reportable under T.S. 6.9.1.9.c. I O1011 017 ] l I O l H. I l 80

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,ig, g Af ter completion of maintenance, personnel involved returned TV-BD1004, B, D and F to l i, i, , [ service without measuring stroke time. Personnel involved have reviewed the event and I g ;been instructed in requirements. Maintenance procedures will be changed to include i q ,g valves for which cycling and/or timing is reouired. l 11141 I l

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Virginia Electric and Power Company North Anna Power Station, Unit No.1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 78-It3/03L-0

. Event Description After completing repairs on TV-BD100 A, B, D and F, stroke times were not measured prior to return to service as required by T.S. 4.6.3.1.1.b. Quality Control review of the completed Maintenance Report determined that the valve had been functionally tested, but not timed.

Probable Ccnsequences of Occurrence Each valve had redundant valves to perform the intended function. As a -

result, the consequences were minimal and the health and safety of the public was not endangered.

Cause of Occurrence Personnel involved did not measure stroke time while performing functional tests after maintenance.

Immediate Corrective Action TV-BD-100 A, B, D and F were tested. All stroke times were found to be within specification.

Scheduled Corrective Action A listing of all valves requiring stroke time measurement following maintenance will be added to valve maintenance procedures.

Action Taken to Prevent Recurrence Involved personnel were reinstructed in the requirements of T.S. 4.6.3.1.1.b in regards to the stroke time measuring following maintenance.