05000338/LER-1980-086-03, /03L-0:on 801023,while Running Steam Driven Auxiliary Feedwater Pump,Relief Valve 1-FW-RV-100 Failed to Reseat Properly.Affected Feedwater Pump Declared Inoperable. Cause by Damaged Seating Surface.Valve Repaired

/03L-0:on 801023,while Running Steam Driven Auxiliary Feedwater Pump,Relief Valve 1-FW-RV-100 Failed to Reseat Properly.Affected Feedwater Pump Declared Inoperable. Cause by Damaged Seating Surface.Valve Repaired

ML19339B625
Person / Time
Site:	North Anna
Issue date:	11/03/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19339B623	List: 05000338/LER-1980-086, Forwards LER 80-086/03L-0 05000338/LER-1980-086-03, /03L-0:on 801023,while Running Steam Driven Auxiliary Feedwater Pump,Relief Valve 1-FW-RV-100 Failed to Reseat Properly.Affected Feedwater Pump Declared Inoperable. Cause by Damaged Seating Surface.Valve Repaired
References
LER-80-086-03L, LER-80-86-3L, NUDOCS 8011070342
Download: ML19339B625 (3)

LER-1980-086, /03L-0:on 801023,while Running Steam Driven Auxiliary Feedwater Pump,Relief Valve 1-FW-RV-100 Failed to Reseat Properly.Affected Feedwater Pump Declared Inoperable. Cause by Damaged Seating Surface.Valve Repaired

Event date:
Report date:
3381980086R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/

/V/A/N/A/S/1/ (2)

/0/0/-/0/0/0/0/0/-/0/0/ (3)

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

/ / / (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

/0/1/

RE [L[ (6)

/0/5/0/0/0/3/3/8/ (7)

/1/0/1/3/8/0/ (8) /i/i/o /3 /8 /0 / (9)

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

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On October 13, 1980, while running 1-FW-P-2 (Steam Driven Aux. Feedwater Pump) /

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on recire for 1-PT-71.1 excessive valve chatter occured on relief valve 1-FW- /

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RV-100.

With the failure of 1-FW-RV-100 to reseat properly after lifting the /

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affected Aux. Feedwater Pump 1-FW-P-2 was declared inoperable; thus contrary

/

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to T.S. 3.7.1.2.

Since the two full size electric driven Aux. Feedwater Pumps /

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(1-FW-P-3A, 1-FW-P-3B) were available, the health and safety of the public

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were not affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/

/H/H/ (11) /E/ (12) /B/ (13) /V/A/L/V/E/X/ (14) /P/ (15)

/B/ (16)

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

CODE TYPE NO.

(17) REPORT NUMBER

/8/0/

/-/ /0/8/6/

/\\/

/0/3/

/L/

/-/

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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

/B/ (18) [Z[ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) /Y/ (23)

/N/ (24) /A/ (25) /F/0/3/5/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The relief valve was a 3" (ID) Farris Co. (26JA14-121) relief valve. The valve /

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was removed, disassembled and examined and the seating surface was found to be /

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cut possibly by excessive valve chattering. The valve was removed, disassembl-/

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ed and the seating surface lapped. Subsequent to repair the lifting setpoint /

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was verified and the valve replaced and tested satisfactorily.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

/1/5/

/E/ (28)

/1/0/0/ (29) /

NA

/ (30) /B/ (31) /During Surveillance Testing /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

/1/6/

/Z/ (33)

/Z/ (34) /

NA

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/

NA

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) LZ[ (38) /

NA

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

/1/8/ /0/0/0/ (40) /

NA

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LOSS OF OR DAMAGE TO FACILITY (43)

TYPE

DESCRIPTION

/1/9/

[Z[ ('.2)

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NA

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

/2/0/

[N[ (44) /

NA

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8 0110'r 0 C3 /J' d

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Virginia Electric and Power Company North Anna Power Station, Unit 1

Attachment:

Page 1 of 2 Docket No. 50-338 Report No. LER 80-086/03L-0

Description of Event

On October 15, 1980, with Unit 1 in mode 1 at 100% power a periodic surveillance test was performed to demonstrate the operability of the Steam Driven Aux. Feedwater Pump (1-FW-P-2).

Upon starting the pump (on recirc.) the relief valve off the main discharge header down stream of the recire. Line begin to lif t as discharge pressure rose above 1400 PSI - the lifting setpoint.

Instead of reseating immediately upon reducing discharge pressure, the valve began to chatter open and closed.

With the failure of 1-FW-RV-100 (the affected relief valve) the affected Aux. Feedwater Pump was declared inoperable. This event is reportable pursuant to T.S. 6.9.1.9.b.

I Probable Consequences of Occurrence The consequences of the event were limited in that two redundant

]

full size electric Aux. Feedwater Pumps (1-FW-P-3A,1-FW-P-3B) were available to provide full flow to the steam generators on a loss of main i

feed. Consequently, the health and safety of the public were not affected.

Cause of Event

The concerned valve was a 3' (ID) Farris Company relief valve.

Upon receiving authorization the valve was removed, disassembled and examined. The inspection revealed that the seating surface of the valve had been cut and damaged due to excessive valve chattering while starting the pump on recire. This chattering in 'he "alve was apparently occuring because the relief setpoint for the reliet valve was set too close to the discharge pressure of the aux, feed pump resulting in damage to the valve seat.

Immediate Corrective Action

The immediate corrective action was to place 1-FW-P-2 in an inoper-able status thus requiring the relief valve to be repaired and the pump successfully tested within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in hot shutdown -ithin the next six hours. An emergency maintenance report was issued and the relief valve was removed, disassembled and examined. All gasket surfaces were cleaned, new gaskets installed and the valve seat lapped. The

- valve was then reassembled and the relief setpoint for the valve set, verified and the valve reinstalled.

1-PT-71.1 (Aux. Feedwater Pump 1-FW-P-2) was then successfully completed and the pump declared operable.

Scheduled Corrective Action The LC0 was met, the system repaired and no further corrective action is needed.

Attachment:

Page 2 of 2 Actions Taken to Prevent Reccurrence The lifting setpoint has been increased to the upper band of its tolerance (1430 pounds) in order to avoid having the relief lift on future pump starts on recire.

Generic Implications There are no generic implications based on maintanence history.