05000339/LER-1981-064-03, /03L-0:on 810813,steam Turbine Driven Auxiliary Feedpump Failed to Operate Properly During Periodic Surveillance Test.Caused by Failed Speed Control Governor. Governor Replaced & Pump Retested Satisfactorily

/03L-0:on 810813,steam Turbine Driven Auxiliary Feedpump Failed to Operate Properly During Periodic Surveillance Test.Caused by Failed Speed Control Governor. Governor Replaced & Pump Retested Satisfactorily

ML20010F736
Person / Time
Site:	North Anna
Issue date:	09/04/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F734	List: 05000339/LER-1981-064, Forwards LER 81-064/03L-0 05000339/LER-1981-064-03, /03L-0:on 810813,steam Turbine Driven Auxiliary Feedpump Failed to Operate Properly During Periodic Surveillance Test.Caused by Failed Speed Control Governor. Governor Replaced & Pump Retested Satisfactorily
References
LER-81-064-03L-01, LER-81-64-3L-1, NUDOCS 8109110259
Download: ML20010F736 (2)

LER-1981-064, /03L-0:on 810813,steam Turbine Driven Auxiliary Feedpump Failed to Operate Properly During Periodic Surveillance Test.Caused by Failed Speed Control Governor. Governor Replaced & Pump Retested Satisfactorily

Event date:
Report date:
3391981064R03 - NRC Website

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f3 U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT 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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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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LL/ (6)

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(7)

/0/8/1/3/8/1/ (8) /n/9/o/4/s/1/ (9)

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

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/ On August 13, 1981, with Unit 2 at 42 percent power, the steam turbine driven

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/ auxiliary feedpump failed to operate properly during a periodic surveillance

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/ test.

Since two 50 percent capacity electric driven auxiliary feedpumps remained /

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/ available if required, the public health and safety were not affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/H/H/ (11) g/ (12) LB/ (13) /M/E/C/F/U/N/ (14) LZ/ (15) g/ (16)

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

CODE TYPE NO.

(17) REPORT NUMBER

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LL/

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPED-4 PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER f

/C/ (18) /Z/ (19) /Z/ (20) LZ/ (21) /0/0/0/0/ (22) g/ (23) LN/ (24) LA/ (25) /W/2/9/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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/ The reason for removing the steam turbine driven auxiliary feedpump from service /

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/ was a failed speed control governor. The governor was replaced and the pump was /

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/ retested satisfactorily.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

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LF/ (28)

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NA

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/B/ (31)

/During Surveillance Testing /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF PELEASE (36)

/1/6/

LZ/ (33)

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NA

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NA

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z/ (38) /

NA

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PERSONNEL INJURIES NUMBEh DESCRIPTION (41)

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NA

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LOSS OF OR DAMAGE TO FACILI'IY (43)

TYPE

DESCRIPTION

/1/9/

/Z/ (42) /

NA

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PUBLICITY 8109110259 810904 ISSUED DESCRIPTION (45)

PDR ADOCK 05000339 NRC USE ONLY

/2/0/

/N/ (44) /

NA S

PDR

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151

!4%.

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Virginia. Electric and Power Company j

North Anna Power Station, Unit f?

Attachment:

Page 1 of I Dock't No. 50-339 Report No. LER 81-064/03L-0 1

Description of Event

4 On August 13, 1981, uith Unit 2 in Mode 1, the steam turbine driven auxiliary feedpump failed to' function properly during a monthly periodic surveillance test and was subsequently removed from service. This event

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is contrary to T.S. 3.7.1.2,'and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence Since two 50% capacity electric driven auxiliary feedpumps were available to supply feedwater to steam generators if required, the public health and safety were not affected.

Cause of Event

The cause of this event was a failed speed control governor on the steam turbine driven auxiliary feedpump. After verifying the speed c ntrol governor was properly adjusted, the feedpump was started for a monthly surveillance test. The pump discharge pressure pegged high and I

the pump discharge relief valve lifted. The governor speed setting was adjusted downwards by the operator but with no effect, and the pump was subsequently removed from service for repairs of the governor.

Inmediate Corrective Action The affected pump was removed from service. The defective governor was removed and replaced with a spare.

i Scheduled Corrective Action The defective governor has been sent to the manufacturer for repair.

After its repair, it will~be maintained as a spare.

Actions Taken to Prevent Recurrence No further action is required.

Generic Implications Similar failures as described above have not occurred in the past; therefore, there are no generic implications to this event.

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