ML19254E302

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Forwards LER 79-135/03L-0
ML19254E302
Person / Time
Site: North Anna Dominion icon.png
Issue date: 10/29/1979
From: Stallings C
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19254E303 List:
References
887, NUDOCS 7910310432
Download: ML19254E302 (2)


Text

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Vino 1xrA Er.ncrnte ann Pownn Co>1rAxy R ucn> TON D,VIHOINIA 202 61 October 29, 1979 Mr. James P. O'Reilly, Director Serial No. 887 Of fice of Inspection and Enforcement P0/RMT:baw U. S. Nuclear Regulatory Commission Docket No. 50-338 Region II 101 Marietta Street, Suite 3100 License No. NPF-4 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

Pursuant to North Anna Power Station Technical Specifications, the Virginia Electric and Power Company hereby su.bmits the following Licensee Event Report for North Anna Unit No. 1.

Report No. Applicable Technical Specifimations LER 79-135/03L-0 T. S. 6.9 .1.9 .b .

This report i,as been reviewed by the Station Nuclear SVety and Operating Committee and will be placed on the agenda for the new meeting of the System Nuclear Safety and Operating Committee.

Very truly yours, b lf). O Ec'b s <

C. M. Stallings Vice President-Power Supply and Production Operations Enclosures (3 copies) cc: Mr. Victor Stello, Director (30 copies)

Office of Inspection and Enforcement Mr. Norman M. Haller, Director (3 copies)

Office of Management and Program Analysis 4 27,5 7910310

Virginia Electric and Power Company North Ann- Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. J0-338 Report No. LER 79-135/03L-0 Description of Event On September 28, 1979, with the unit in cold shutdown, the time delays for recirculation spray pump 1-RS-P-1A, chemical addition tank discharge valve MOV-QS102A, and casing cooling pump discharge valve MOV-RS101A were found to be outside the acceptable limits during the perforn.suco of the 18 month CDA Functional test.

Probable Consequences of Occurrence The health and safety of the general public were not affected because redund-ant equipment was availr%1e whose timers were verified to be wit' . '. specifica-tions. There are no generic implications associated with this event.

Cause of Occurrence The cause for the timers being out of specification for 1-RS-P-1A and MOV-QS-102A was apparently due to the original setting being too close to the upper limit. Other checks of the timers were within the tech. spec. tolerance at their appropriate setpoints. The cause for the specification tolerance deviation of the MOV-RS-101 A timer was a failure of the timer.

Immediate Corrective Action Timers for 1-RS-P-1A and MOV-QS-102A were reset. Timers for MOV-RS-101A were replaced and reset.

Scheduled Corrective Action A review of the procedure used to set timers will be conducted and modified to insure that timers are set closer to the required setpoint.

Actions Taken to Prevent Recurrence Implement scheduled actions by retesting the load sequence timers of T.S. 4.8.1.

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