05000338/LER-1979-099-09, /09L-0:on 790809,containment hi-hi Pressure Channel II Annunciator Became Energized on 790801.Channels I,Iii & IV Remained in Operation.Caused by Failure of Heat Sensitive W-39-1-J Card Component

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/09L-0:on 790809,containment hi-hi Pressure Channel II Annunciator Became Energized on 790801.Channels I,Iii & IV Remained in Operation.Caused by Failure of Heat Sensitive W-39-1-J Card Component
ML19208A023
Person / Time
Site: North Anna 
Issue date: 09/07/1979
From: Cartwright W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19208A016 List:
References
LER-79-099-09L, LER-79-99-9L, NUDOCS 7909120433
Download: ML19208A023 (2)
v • d • e


LER-1979-099, /09L-0:on 790809,containment hi-hi Pressure Channel II Annunciator Became Energized on 790801.Channels I,Iii & IV Remained in Operation.Caused by Failure of Heat Sensitive W-39-1-J Card Component
Event date:
Report date:
3381979099R09 - NRC Website
v • d • e

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N AYE OF PHEPARER PHONE:

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

Attachment:

Page 1 of 1 Docket No. 50-338 Repor t No. LER 79-099 /03L-0

Description of Event

On August 9, 1979, during steady state operation, the Containment Hi Hi Pressure Channel II annunciator energized.

Af ter determining that an actual accident condition did tot exist, the affected channel was placed in the blocked condition and declared inoperable.

Probable Consequences Of Occurrence The consequences of this event were limited because three out of the four containment Hi Hi pressure channels remained operable to initiate a Con-tainment Depressurization Actuation if required.

Therefore, the health and safety of the general public were not affected.

This event has no generic implications affecting Unit 1 and Unit 2 instrumentation.

Cause

A bistable for Containment Hi Hi Pressure Channel II f ailed because card component W-31-J was heat sensitive.

Immediate Corrective Action

Af ter ensuring that a Hi Hi pressure in the containment did not exist, a maintenance report was submitted to the instrument department to determine the reason for the annunciator becoming energized.

The work performed was to place the channel in the blocked condition, replace the htstable, re-calibrate the card, functionally check the loop and return the channel to normal.

Scheduled Corrective Action No further corrective actions required.

Actions Taken to Prevent Recurrence No further actions required.

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