ML19257A170

LER 79-155/03L-0:on 791203,during 18-month Test to Verify Setpoints,Safety Valves SV-1551A & SV-1551C Relieved at Pressure Below Acceptable Tolerance Band.Caused by Setpoint Drift.Setpoints Reset & Verified

ML19257A170
Person / Time
Site:	North Anna
Issue date:	01/02/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257A168	List: ML19257A167 ML19257A170
References
LER-79-155-03L, LER-79-155-3L, NUDOCS 8001020392
Download: ML19257A170 (2)

Text

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EVENT DESCRIPTION AND PROBABLE CONSECUENCES h o 2 l During the performance of the 18 month periodic test to verify the se tpoints of the _

I g 3 g pressurizer safety valves, SV-1551A and SV-1551C both relieved at a pressure below the I g 4 l acceptable tolerance hand of 2485 psig 25 psi. The health and safe ty of the peneral l o 5 l public were not af fected by this event. Reportable pursuant to T.S. 6.9.1.9.b l o o 1 l

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, g Toe cause for the setpoint below allowable is setpoint drif t. SV-1551A and C l

, , gwere rese t and their setpoints were verified acceptable by retest.

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Attachment:

Page 1 of 1 Docket No. 50-338 Repor t No. LER 79-155/03L-0 Description of Event During periodic testing of the pressurizer safety valves, SV-1551A and SV-1551C were both found to have a relief setpoint which was below the acceptable value of 2485 psig 25 psig.

Probable Consequences of Occurrence The purpose of the pressurizer code safe ty valves is to prevent reactor coolant system pressure from exceeding 110 percent of system design pressure.

Because the valve s we re se t to relieve at a pressure lower than desired ,

which is actually more conservative, the health and safety of the general public were not af fected. No generic implications exist for this event.

Cause of Occurrence The setpoints of the safety valves drif ted low. .

Immediate Corrective Action The relief se tpoints for safety valves SV-1551A and C were readjusted and verified acceptabic by retest.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required, i663 125