ML19256G193

LER 79-158/01T-0:on 791211,during Mode 5,S&W Notified Util That Nonseismically Qualified Pressure Differential Switch (PDS-HV1228A & B) Had Been Used in Condenser Water Controls in Control Room Air Conditioners

ML19256G193
Person / Time
Site:	North Anna
Issue date:	12/21/1979
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256G191	List: ML19256G190 ML19256G193
References
LER-79-158-01T, LER-79-158-1T, NUDOCS 7912270588
Download: ML19256G193 (2)

Text

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NRC FORM M6 U.S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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10l1I s$g*CE X @l 0 l 5 lDOCK 0 lET0NUMBER l0 l 3 ] 368l 8@l1 69 l2 l1DATE EVENT l1 l7 l9 @l1 74 75 l2REPORT l2 l1DATE 8C 7 8 60 61 EVENT DESCRIPTION AND PROBASLE CONSEQUENCES h O 2 l On December 11, 1979, with the unit in Mode 5, Stone & Webster informed Vepco that a_I O a l non-seismically qualified pressure differential switch (PDS-HV1228 A and B) had been 1 0 4 l used in the condenser water controls for the control and relay room air conditicners. I e 's I a seismic category I system. This discrepancy was discovered during the review re- ]

s l quired by IEC 78-08. The health and safety of the general public were not affected I O

l 0 l 7 l l by this event. Reportable pursuant to T.S. 6.9.1. 8.1. I l

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[i li l seismic category I system. The pressure differential switch is presentiv being re- l l1 12 I levaluated tnJtermine if replacement is necessary. I I

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

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-158/01T-0 Description of Event On December 11, 1979, with the unit in a cold shutdown, Stone & Webster informed Vepco that during the review required by IEC 79-08 it had discovered that a non-seismically qualified switch had been used in a seismic category I system. The switch concerned is PDS-HV1228A and B which is used in the con-denser water controls for the control and relay room air conditioning system.

Probable Consequences of Occurrence A probable consequence of this event is that the switch could fail during an earthquake and jeopardize the proper operation of the control and relay room air condicioners. The health and safety of the general public have not been endangered by this occurrence. Identical pressure dif ferential switches are used in Unit 2's air conditioning system and is therefore simi-larly affected.

Cause of Occurrence The reason for the non-seismically qualified switch being used in a seismic category I system is not known at this time.

Immediate Corrective Action The pressure dif ferential switch is prest itly being re-evaluated to determine if replacement is necessary.

Scheduled Corrective Action If replacement is required, an equivalent switch with seismic qualifica-tions will be installed in place of PDS-HV1728 A and B.

Actions Taken to Prevent Recurrence No further actions are required.

164;2 036