ML20038C728

LER 81-025/03L-0:on 811102,emergency Diesel Generator B Failed to Start Manually.Caused by Loss of Prime in Fuel Oil Sys,Possibly Due to Debris in Ball Check Valve.Generator Returned to Svc

ML20038C728
Person / Time
Site:	Robinson
Issue date:	12/02/1981
From:	Cox H CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20038C721	List: ML20038C720 ML20038C728
References
LER-81-025-03L, LER-81-25-3L, NUDOCS 8112140078
Download: ML20038C728 (2)

Text

MRC FORM 366 U, S. NUCLE AR REGUL ATORY COMMISSION (7-77) "

- LICENSEE EVENT F EPORT CONTROL BLOCK: l 1

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7 8 60 61 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 2 l [ On November 2, 1981, a t 1906 hours0.0221 days <br />0.529 hours <br />0.00315 weeks <br />7.25233e-4 months <br />, with the unit at 50% power, "B" emergency diesel l 90 ,3; l genera tor was declared inoperable when it failed to manually start during Periodic l 1 o l 4 l l Test PT-23.1. '1his resulted in a degraded mode of operation permitted by Technical l

o ; ,, ; l Specifica tion (T.S.) 3.7.2.d and is reported pursuant to T. S . 6. 9. 2. b . 2. The l l o Ic i Iredundant emergency diesel genera tor was demonstrated operable just prior to this l 10171 l event, therefore there was no threat to the public health and safety. l Io18l l l 7 8 9 80 SYSTE"1 CAUSE C AUS E COVP. VAL %E CODE CODE SU9 CODE COYPONENT CCDE SUBCODE SUBCODE yg i El El@ l Xl@ l X l@ lE lN lG lI lN lE l@ l zl@ W @

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44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS g g lThe cause of failure was loss of prime in the fuel oil system. This may have been due l

[i ;; j to debris in the ball check valve which allowed fuel oil to drain back to the day tank.1

, , , , [There was no actual debris found in the ball check valve or the piping. 'h e "B" g

, ;3; diesel generator was successfully tested and declared operable on November 2, 1981, l

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SUPPLEMENTAL INFORMATION FOR LICENSEE EVENT REPORT 81-025

1. Cause Description and Analysis:

On November 2, 1981, a t 1906 hours0.0221 days <br />0.529 hours <br />0.00315 weeks <br />7.25233e-4 months <br />, "B" diesel genera tor '(DG) fa iled to manually start during the weekly Periodic Test of both DG's. "A" DG was demonstrated operable just prior to "B" DG's failure to start.

Two additional unsuccessful starts were attempted. "B" DG fuel oil lines were then primed with the hand pump, which resulted in successfully starting the DG, The failure of "B" DG to start is believed to be the result of debris in the ball check valve which allowed fuel to drain back to the day tank.

It should be noted that during a manual DG start (used during the Periodic Test) the air start solenoids will open for only 10 seconds which may not have provided adequate time to prime the fuel oil lines.

However, during an automa tic start of a DG (safeguards actuation), the time the air start solenoids are open is not limited, and therefore the diesel would probably have started on an automatic signal.

"B" DG's failure to sta rt, a degraded mode of operation as described in Technical Specification 3.7.2.d, is repot ted pursuant to 6.9.2.b.2.

2. Corrective Action:

The fuel oil lines and ball check valve were disassembled, inspected, reassembled and "B" DG returned to an operable condition at 2208 hours0.0256 days <br />0.613 hours <br />0.00365 weeks <br />8.40144e-4 months <br /> on November 2, 1981.

3. Co rrec t ive Ac t io n to Prevent Recurrence:

No further action is considered necessary.