05000338/LER-1980-054-03, /03L-0:on 800603,containment Internal Air Partial Pressure Exceeded Tech Spec Limit.Caused by Air Leakage Past Containment Purge Supply Valve.Valve Subsequently Verified Closed & Leak Tested

/03L-0:on 800603,containment Internal Air Partial Pressure Exceeded Tech Spec Limit.Caused by Air Leakage Past Containment Purge Supply Valve.Valve Subsequently Verified Closed & Leak Tested

ML19318D128
Person / Time
Site:	North Anna
Issue date:	07/03/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318D119	List: 05000338/LER-1980-054, Forwards LER 80-054/03L-0 05000338/LER-1980-054-03, /03L-0:on 800603,containment Internal Air Partial Pressure Exceeded Tech Spec Limit.Caused by Air Leakage Past Containment Purge Supply Valve.Valve Subsequently Verified Closed & Leak Tested
References
LER-80-054-03L, LER-80-54-3L, NUDOCS 8007070381
Download: ML19318D128 (2)

LER-1980-054, /03L-0:on 800603,containment Internal Air Partial Pressure Exceeded Tech Spec Limit.Caused by Air Leakage Past Containment Purge Supply Valve.Valve Subsequently Verified Closed & Leak Tested

Event date:
Report date:
3381980054R03 - NRC Website

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DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On June 3, 1980, the containment internal air partial pressure exceeded the

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allowable Technical Specification limit for the existing service water and

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RWST temperatures by 0.3 psia. Because the unit was in Mode 3 and the air

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partial pressure was returned to acceptable limits within I hour, the health

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pursuant to T.S. 6.9.1.9.b.

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SYSTEM

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

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The air partial pressure limit was exceeded because of air leakage past a

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containment purge supply valve. Initial action was to restore the partial

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pressure by starting the containment air recire fans and securing the outside /

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instrument air. The purge supply valve was subsequently verified closed by

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manual operation and satisfactorily type "C" tested.

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NRC USE ONLY

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b 00707 0 WNAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151

Virginia Electric and Power Company North Anna Power Station, Unit #1 Attachment: Page 1 of I Docket No. 50-338 Report No. LER 80-054/03L-0

Description of Event

On June 3, 1980, with the unit in a hot standby condition, the containment internal air partial pressure exceeded the corresponding Technical Specification limit for the existing service water and RWST temperatures by 0.3 psia. This event is contrary to T.S. 3.6.1.4 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequence of Occurrence The containment air partial pressure and temperature are varied as a function of service water temperature and Refueling Water Storage Tank (RWST) water temperature according to the Technical Specification, Figure 3.6-1.

This is required to assure the containment will depressurize in less than 60 minutes and subatmospheric pressure is maintained thereafter.

Because the air partial pcessure was returned to acceptable limits within I hour and the unit was in Mode 3 when the event occurred, the health and safety of the general public were not affected.

Cause of Event

The air partial pressure limit was exceeded due to air leakage past containment purge supply valve MOV-HV1000.

Immediate Corrective Action

The containment air partial pressure was restored to within specs by starting the containment air recirculation fans and securing the outside instrument air.

The leaking purge supply valve was later manually operated and verified closed. The valve was then Type "C" tested with satisfactory results.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required.

Generic Implications There are no generic implications associated with ruis occurrence.

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