05000338/LER-1981-044-03, /03L-0:on 810522,one of Two Safeguards Area Ventilation Sys Declared Inoperable.Caused by Failure of Exhaust Fan Discharge Rubber Expansion Joint Retaining Sys. Joint Refastened & Declared Operable

/03L-0:on 810522,one of Two Safeguards Area Ventilation Sys Declared Inoperable.Caused by Failure of Exhaust Fan Discharge Rubber Expansion Joint Retaining Sys. Joint Refastened & Declared Operable

ML20004F159
Person / Time
Site:	North Anna
Issue date:	06/10/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004F152	List: 05000338/LER-1981-044, Forwards LER 81-044/03L-0 05000338/LER-1981-044-03, /03L-0:on 810522,one of Two Safeguards Area Ventilation Sys Declared Inoperable.Caused by Failure of Exhaust Fan Discharge Rubber Expansion Joint Retaining Sys. Joint Refastened & Declared Operable
References
LER-81-044-03L, LER-81-44-3L, NUDOCS 8106160568
Download: ML20004F159 (2)

LER-1981-044, /03L-0:on 810522,one of Two Safeguards Area Ventilation Sys Declared Inoperable.Caused by Failure of Exhaust Fan Discharge Rubber Expansion Joint Retaining Sys. Joint Refastened & Declared Operable

Event date:
Report date:
3381981044R03 - NRC Website

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/~l U.S. NUCLEAR REGULATORY COMMISSION kd LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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

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/ On May 22, 1981, while in Mode I, one of two safeguards area ventilation systems /

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/ (SAVS) was declared inoperable due to a failure of the exhaust fan (1-HV-F-40A) /

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/ discharge rubber expansion joint. This event is contrary to the requirements of /

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/ T.S. 3.7.8.1 and reportable pursuant to T.S. 6.9.1.9.b.

Since the redundant SAVS/

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/ remained operable and the expansion joint was repaired within 7 days as

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/ required by the action statement, the public health and safety were not affected /

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SYSTEM

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VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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/ This event was caused by the failure of the rubber expansion joint retaining

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/ system. The expansion joint was refastened and declared operable.

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8106160 j336thf

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Virginia Electric and Power Company North Anna Power Station, Unit 1 Attachment: Page 1 of I Docket No. 50-338 Report No. LER 81-044/03L-0

Description of Event

On May 22, 1981, while performing a routine walkdown, operations personnel noted that the expansion joint on the discharge of SAVS exhaust fan (1-HV-F-40A) had pulled loose from the ventilation ducting. Operation of the fan was terminated and maintenance personnel notified. Other expansion joints were examined with no discrepancies.

Probable Consequences of Occurrence In the event of a LOCA, the SAVS exhaust fan takes a suction in the safeguards area through charcoal and HEPA filters to ensure that radioactive materials leaking from ECCS equiprent within the pump room are filtered prior to entering the atmosphere. Since the redundant SAVS train remained operable and the joint was repaired within 7 days as required by T.S. 3.7.8.1, the health and safety of the public were not affected.

Cause of Event

The cause of this event was the failure of the rubber expansion joint retaining system on the discharge side of 1-HV-F-40A.

Immediate Corrective Action

The rubber expansion joint was reattached and properly fastened.

Scheduled Corrective Action No further action required.

' Actions Taken to Prevent Recurrence This is considered an isolated event with no further action required.

Generic Implications There are no generic implications as a result of this event.