05000338/LER-1979-071-03, /03L-0 on 790511:during Periodic Test at Steady State Operation,Low Head Safety Injection Pump 1A Discharge Valve Failed to Open within 40-s.Cause Unknown.Valve Manually Opened,Reseated & Returned to Operation

/03L-0 on 790511:during Periodic Test at Steady State Operation,Low Head Safety Injection Pump 1A Discharge Valve Failed to Open within 40-s.Cause Unknown.Valve Manually Opened,Reseated & Returned to Operation

ML19269D668
Person / Time
Site:	North Anna
Issue date:	06/06/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19269D662	List: 05000338/LER-1979-068-03, /03L-0 on 790508:radiation Monitoring Channels RM-RMS-159 & RM-RMS 160 Were Declared Inoperable Due to Failure of Sample Pumps 1-RM-RMS 159A & 159B.Caused by Solenoid Valve Coil Shoring Out.Coil Replaced 05000338/LER-1979-069-03, /03L-0 on 790508:during Load Transient,Axial Flux Difference Deviated Greater than 5% from Target for Four Minutes.Caused by Rapid Load Reduction of 100 MW Due to Loss of Drain Pump A.Control Rods Withdrawn 05000338/LER-1979-071-03, /03L-0 on 790511:during Periodic Test at Steady State Operation,Low Head Safety Injection Pump 1A Discharge Valve Failed to Open within 40-s.Cause Unknown.Valve Manually Opened,Reseated & Returned to Operation ML19269D661
References
LER-79-071-03L, LER-79-71-3L, NUDOCS 7906110204
Download: ML19269D668 (2)

LER-1979-071, /03L-0 on 790511:during Periodic Test at Steady State Operation,Low Head Safety Injection Pump 1A Discharge Valve Failed to Open within 40-s.Cause Unknown.Valve Manually Opened,Reseated & Returned to Operation

Event date:
Report date:
3381979071R03 - NRC Website

text

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60 61 DOCKET NUMBER 68 63 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 On 5-11-79, during a periodic test at steady state operation. It was found that the 1

o 3 l low Head Safety Injection Pump 1A discharge valve (MOV-1863A) failed to open within I

lo l41 l 40 seconds. This is contrary to T.S. 3.5.2.

Action statement 3.5.2.a was entered I

10 l s i l and the valve was restored to operability within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> requirement. This eventi lo is l l is reportable as per T.S. 6.9.1.9.b.

Since a fully redundant ST train was operable. I 10171 l this event did not affect the health and safety of the general public.

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8 9 10 68 69 80 E NAME OF PREPARER ", " On ; t,;r ! p,h t PHONE:- - '703 00'-5] 9

Virginia Elcctric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No: 50-338 Report No:

LER 79-071/03L-0

Description of Event

On 5-11-79, during the performance of the periodic test at steady state operation, it was found that the Low Head Safety Injection Pump 1A discharge valve (MOV-1863A) failed to open within 40 seconds.

This is contrary to T.S. 3.5.2.

Action statement 3.5.2.a. was entered and the valve was restored to operability within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> requirement. ~ This event is reportabic as per T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The operability of the two ECCS subsystems ensures that sufficient emergency core cooling capability will be available in the event of a LOCA assuming the loss of one subsystem through any single failure consideration.

Either subsystem operating in conjunction with the accumulators is capable of supplying sufficient core cooling to limit the peak cladding temperatures within acceptable limits for all postulated break sizes ranging from the double ended break of the largest RCS cold leg pipe and smaller.

Since the other Low Head SI train was operable and capabic of supplying emergency cooling, at no time was the safe operation of the plant affected or the public health and safety endangered.

A similar component is present in Unit 2 and any preventive actions will be impicmented in Unit 2 as well.

Cause of Event

The exact cause of the failure of the valve to open is unknown at this time.

It appears to be a result of drying out of the valve packing.

Immediate Corrective Action

The valve was manually opened and rescated and then the valve operated correctly.

Scheduled Corrective Action Any further actions will be determined from an investigation of this problem.

Actions Taken To Prevent Recurrences An investigation is currently being undertaken to determine the exact cause and propose a possible resolution.

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