05000338/LER-1980-087-03, During Repairs to Steam Driven Auxiliary Feedwater Pump 1-FW-P-2,turbine Trip Valve Tripped Upon Pump Startup.Cause Unstated.Valve Governor Reset & Retested Satisfactorily

During Repairs to Steam Driven Auxiliary Feedwater Pump 1-FW-P-2,turbine Trip Valve Tripped Upon Pump Startup.Cause Unstated.Valve Governor Reset & Retested Satisfactorily

ML19350B960
Person / Time
Site:	North Anna
Issue date:	03/18/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350B958	List: 05000338/LER-1980-087, Forwards Updated LER 80-087/03X-1 05000338/LER-1980-087-03, During Repairs to Steam Driven Auxiliary Feedwater Pump 1-FW-P-2,turbine Trip Valve Tripped Upon Pump Startup.Cause Unstated.Valve Governor Reset & Retested Satisfactorily
References
LER-80-087-03X, LER-80-87-3X, NUDOCS 8103240495
Download: ML19350B960 (2)

LER-1980-087, During Repairs to Steam Driven Auxiliary Feedwater Pump 1-FW-P-2,turbine Trip Valve Tripped Upon Pump Startup.Cause Unstated.Valve Governor Reset & Retested Satisfactorily

Event date:
Report date:
3381980087R03 - NRC Website

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UPDATED REPORT - PREVIOUS REPORT DATED NOV. 10, 1980 s_,

U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT 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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O DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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/ On October 15, 1980, while attempting to restore 1-FW-P-2 (Steam Driven Aux Feed-/

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/ water Pump) back to service utilizing periodic test (1-PT-71.1) the turbine trip /

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/ valve tripped upon starting the pump.

Since the affected pump was already within/

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/ an action statement due to a faulty relief valv;, and two fullsize electric

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/ driven aux feedwater pumps were available to deliver feed flow to the steam gen- /

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/___erators on loss of main feed, the health and safety of the public were not

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/ affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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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 LE[ (18) /Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) LZ/ (23) [N[ (24) /A/ (25) /W/2/9/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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/ The turbine trip valve is controlled by a speed limiting P. G. hydraulic Wood-

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/ ward Governor through a direct acting linkage. The governor was examined by

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/ maintenance persennel to determine the reason for the turbine trip valve tripp- /

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/ ing.

Consequently the governor was reset in accordance with Woodward Bulletin

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/ 3602 page 8, and tested satisfactorily by periodic surveillance test.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

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[E/ (28)

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NA

/ (30) [B[ (31) / During Surveillance Test /

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

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES.

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LOSS OF OR DAMAGE TO FACILITY (43)

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FJBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 91os24e495

Virginia Electric and Power Company North Anna Power Station, Unit 1 Attachment: Page 1 of 1 Docket No. 50-338 Report No. LER 80-087/03X-1

Description of Event

On October 15, 1979 while operating Unit I at 100*. power a periodic surveillance test (1-PT-71) was being performed in order to prove the Steam Driven Aux Feedwater operable after having been inoperable for 1 1/2 days for a faulty relief valve. Upon starting the pump the turbine trip valve tripped shut-thus shutting down the pump. With the failure of the governor to properly limit overspeed the Steam Drive Aux Feedwater Pump remained inoperable and is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The consequences of this event were minimal in that two fullsize Electric Driven Aux Feedwater pumps (IFW-P-3A,1-FW-P-3B) were available to provide flow to the steam generators on a loss of main feed. Consequently, the health and safety of the public were not affected.

Cause of Event

The cause for the failure of the Woodward Governor and the subsequent trip valve could not be determined by maintenance personnel.

It is thought-that the compensating needle valve was set too far open thus causing the governor to respond too quickly for proper operation.

Immediate Corrective Action

The trip valve was reset, the. governor examined, and the compensating needle valve adjusted in accordance with Woodward bulletin 3206, page 8.

. Subsequent to maintenance the affected aux feedwater pump was successfully tested in accordance with periodic surviellance test 1-PT-71.1 and declared operable, and available for service.

Scheduled Corrective Action

- None scheduled.

Actions Taken to Prevent Reccurrence-None required at this time.

If.further surveillance tests on 1-FW-P-2 indicate problems still exist with the Woodward Governor, then further' action may be explore 4.

Generic Implications

- Maintenance history to date does.not indicate any generic implications for the Terry Turbine' ( Steam Driven Aux Feedwater Pump) Woodward Governor failing in.this manner.'