05000339/LER-1981-026-03, /03L-0:on 810226,containment Quench Spray Subsys Train a Taken Out of Svc to Repair Leak on Flow Indicator.On Following Day,Train B Removed from Svc to Perform Maint & Repair Leaks in Fittings & Hoses

/03L-0:on 810226,containment Quench Spray Subsys Train a Taken Out of Svc to Repair Leak on Flow Indicator.On Following Day,Train B Removed from Svc to Perform Maint & Repair Leaks in Fittings & Hoses

ML20003D775
Person / Time
Site:	North Anna
Issue date:	03/26/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003D761	List: 05000339/LER-1981-026, Forwards LER 81-026/03L-0 05000339/LER-1981-026-03, /03L-0:on 810226,containment Quench Spray Subsys Train a Taken Out of Svc to Repair Leak on Flow Indicator.On Following Day,Train B Removed from Svc to Perform Maint & Repair Leaks in Fittings & Hoses
References
LER-81-026-03L, LER-81-26-3L, NUDOCS 8103310578
Download: ML20003D775 (2)

LER-1981-026, /03L-0:on 810226,containment Quench Spray Subsys Train a Taken Out of Svc to Repair Leak on Flow Indicator.On Following Day,Train B Removed from Svc to Perform Maint & Repair Leaks in Fittings & Hoses

Event date:
Report date:
3391981026R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT g

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

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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

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/4/1/1/1/1/ (4)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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RE [L/ (6)

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

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On February 26, 1981. train "A" of the Containment Quench Spray Subsystem was /

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taken out of service and declared inoperable to repair a leak on flow indicator /

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FI-QS-203.

The following day, after train A was returned to service, train B /

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was removed from service to perform maintenance and repair leaks in mechanical /

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fittings and hoses. Since only one train was removed from service at a time and/

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each train was restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, the health and

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safety of the general public were not affected.

SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/S/B/ (11) [X/ (12) [Z/ (13) /P/I/P/E/X/X/ (14) [A/ (15)

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SEQUENTIAL OCCURRENCE RE.TRT 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 [Z/ (18) /Z/ (19) /Z/ (20) LZ/ (21) /0/0/0/0/ (22) [Y/ (23) [N/ (24) [N/ (25) /S/2/8/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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Each train of the Quench Spray Subsystem was removed from service to perform

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maintenance which improved the reliability of the system.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS

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[E/ (28)

/1/0/0/ (29) /

NA [B/ (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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NA

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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NA

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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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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 0337023I]fjJ

Virginia Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of 1 Docket No. 50-339 Report No. LER 81-026/03L-0

Description of Event

On February 26, 1981, train A of the Containment Quench Spray Subsystem was taken out of service and declared inoperable to repair a leak on an isolation valve (2-QS-27) to indicator FI-QS-203. The following day, after train A was restored to operable status, train B was removed from service to perform maintenance and repair leaks in mechanical fittings and hoses. This is contrary to T.S. 3.6.2.1 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence Since only one train was removed from service at a time, and each train was restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, the health and safety of the general public were not affected.

Cause of Event

Each train of the Quench Spray Subsystem was removed from service to perform maintenance which improved the reliability of the system.

Immediate Corrective Action

Mechanical fittings were taken apart, cleaned and refitted. Flexible hoses which were leaking were also replaced.

Scheduled Corrective Action 2-QS-27 will be replaced during the next refueling outage.

Actions Taken to Prevent Recurrence

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No additional action is required to prevent recurrence.

Generic Implications There are no generic implications.