05000338/LER-1981-031-03, /03L-0:on 810414,fire Damper Between Unit 1 & 2 Cable Tunnels Failed to Shut.Caused by Binding of Trip Cable & Misalignment of Door within Track.Damper Mod Request Initiated

/03L-0:on 810414,fire Damper Between Unit 1 & 2 Cable Tunnels Failed to Shut.Caused by Binding of Trip Cable & Misalignment of Door within Track.Damper Mod Request Initiated

ML19345H440
Person / Time
Site:	North Anna
Issue date:	05/15/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345H439	List: 05000338/LER-1981-031, Forwards LER 81-031/03L-0 05000338/LER-1981-031-03, /03L-0:on 810414,fire Damper Between Unit 1 & 2 Cable Tunnels Failed to Shut.Caused by Binding of Trip Cable & Misalignment of Door within Track.Damper Mod Request Initiated
References
LER-81-031-03L-01, LER-81-31-3L-1, NUDOCS 8105200294
Download: ML19345H440 (2)

LER-1981-031, /03L-0:on 810414,fire Damper Between Unit 1 & 2 Cable Tunnels Failed to Shut.Caused by Binding of Trip Cable & Misalignment of Door within Track.Damper Mod Request Initiated

Event date:
Report date:
3381981031R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION m

LICENSEE EVENT REPORT V

CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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

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/ On April 14, 1981, with the Unit in Mode 1, the fire damper between Unit 1 and 2 /

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/ cable tunnels failed to shut during an operational inspection. Within one hour, /

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/ the fire detectors were verified operational and a fire watch was posted. Hence,/

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/ the health and safety of the general public were not affected. This Special

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/ Report is being submitted pursuant to T.S. 3.9.2 as called for by T.S. 3.7.15

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/ (Unit 2) since the fire damper was not made operational within seven days.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/A/B/ (11) /B/ (12) /A/ (13) /V/A/L/V/E/X/ (14) [X/ (15) g/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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/ The fire damper failed to shut due to binding of the trip cable and misalignment /

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/ of the door within its track. An Engineering Work Request was initiated to pro- /

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/ pose a solution to improve operability of the damper. The modification has not /

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/ been incorporated at this time.

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FACILITY METHOD OF STATUS

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NA

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/_A/ (31) / Fire Marshal Observation /

A ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36) l l

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PERSONNEL EXPOSURES r

NUMBER TYPE DESCRIPTION (39)

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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LOSS OF OR DAMAGE TO FACILITY (43)

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DESCRIPTION

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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l NAME OF PREPARER W. R. CARTVRIGHT

_ PHONE (703) 894-5151 38105200 N

Virginia Electric and Power Company North Anna Power Station, Unit 1 Attachment: Page 1 of I Docket No. 50-338 Report No. LER 81-031/03L-0

Description of Event

On April 14, 1981, with the unit in Mode 1, the fire damper between Unit 1 and 2 cable tunnels failed to shut during an operational inspection.

Since the fire damper was not made operational within seven days, this Special Report is being submitted pursuant to T.S. 6.9.2 as called for by T.S. 3.7.15 (Unit 2).

Probable Consequences of Occurrence The fire detectors within the cable vaults were verified operational within one hour and a fire watch was posted. Thus, the health and safety of the general public were not affected.

Cause of Event

The fire damper failed to shut due to binding of the trip cable and misalignment of the door within its track.

Immediate Corrective Action

As required by the action statement, the fire detectors in the area were verified operational and a fire watch was posted. A Maintenance Request was initiated which required an Engineering Work Request since Mechanical Maintenance could not assure that the damper would shut consistantly.

Scheduled Corrective Action The Engineering Work Request specifies that the trip wire connecting the damper to the CO2 blow off for actuation should te flexible enough to pass through two pulleys without binding the damper. Further, the pulleys are rearranged and sized to pass the cable freely. Also, the gravity operated damper is to be weighted to provide core force for closing.

Actions Taken to Prevent Recurrence No further actions are required at this time.

Generic Implications l

There are no generic implications.

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