05000339/LER-1981-033-03, /03L-0:on 810414,during Mode 1 Operation at 100% Power,B Train Quench Spray Subsys Removed from Svc to Repair Leaking Drain Valve on Pump Discharge Line.Valve Repaired & Disc Replaced.Pump Returned to Svc

/03L-0:on 810414,during Mode 1 Operation at 100% Power,B Train Quench Spray Subsys Removed from Svc to Repair Leaking Drain Valve on Pump Discharge Line.Valve Repaired & Disc Replaced.Pump Returned to Svc

ML20008F950
Person / Time
Site:	North Anna
Issue date:	05/06/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20008F946	List: 05000339/LER-1981-033, Forwards LER 81-033/03L-0 05000339/LER-1981-033-03, /03L-0:on 810414,during Mode 1 Operation at 100% Power,B Train Quench Spray Subsys Removed from Svc to Repair Leaking Drain Valve on Pump Discharge Line.Valve Repaired & Disc Replaced.Pump Returned to Svc
References
LER-81-033-03L, LER-81-33-3L, NUDOCS 8105120386
Download: ML20008F950 (2)

LER-1981-033, /03L-0:on 810414,during Mode 1 Operation at 100% Power,B Train Quench Spray Subsys Removed from Svc to Repair Leaking Drain Valve on Pump Discharge Line.Valve Repaired & Disc Replaced.Pump Returned to Svc

Event date:
Report date:
3391981033R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED IhTORMATION)

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/V/A/N/A/S/2/ (2)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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L/ (6)

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

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On April 14, 1981, during Mode 1 operation at 100% power, the B Train quench

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spray subsystem was removed from service for maintenance purposes. The pump

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was returned to operable status within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time allowance of T.S.

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3.6.2.1 and the A Train quench spray subsystem remained operable. The

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public health and safety were not affected. This is reportable pursuant to

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T.S. 6.9.1.9.b.

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SYSIEM

CAUSE

CAUSE COMP.

VALVE CCDE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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

CODE TYPE NO.

(77) REPORT NUMBER

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

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CAUSE DE.SCRIPTION AND CORRECTIVE ACTIONS (27)

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The quench spray pump was removed from service to repair a leaking drain valve /

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on the pump discharge line. The drain valve was repaired and the leakage

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stopped by replacing the valve disc and then the Train B pump was returned to /

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service.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCO ERY E SCR M ION (32)

/ (30)DISCOERY

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/E/ (28)

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NA [A/ (31)

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OPERATOR OBSERVATION

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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NA

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PERSONNEL EXPOSURES NL?iBER TYPE DESCRIPTION (39)

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NA

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PERSONNEL INJURIES NL?iBER DESCRIPTION (41)

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NA

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LOSS OF OR DAMAGE TO FACILITY (43)

TYPE

DESCRIPTION

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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810512 0 % F PREPARER W. R. CARWRIGHT PHONE (703) 894-5151

Virginia Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of 1 Docket No. 50-339 Report No. LER 81-033/03L-0

Description of Event

On April 14, 1981, during steady state operation at 100% power, quench spray pump 2-QS-P-1B was removed from service for maintenance purposes rendering the Train B containment quench spray subsystem inoperable.

This event is contrary to T.S. 3.6.2.1 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The quench spray subsystems in conjunction with recirculation spray subsystems are designed to provide necessary cooling and depressurization of the containment building following any loss of coolant accident. Two full-size, redundant quench spray subsystems are provided. Train B subsystem was restored to operable status well within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time limitation allowed by T.S. 3.6.2.1.

The Train A quench spray subsystem was operable during this period to depressurize the containment if required. The public health and safety were not affected.

Cause of Event

The Train B quench spray pump was removed from service to allow repair of a leaking drain valve on the pump discharge line.

Immediate Corrective Action

The leakage past the seat of the drain valve was corrected by i

replacing the valve disc. After the work on the valve was completed, the Train B quench spray pump was returned to service.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required.

Generic Implications I

There are no generic implications associated with this occurrence.

(