ML19289F549

Forwards LER 79-025/01T-0

ML19289F549
Person / Time
Site:	Peach Bottom
Issue date:	06/04/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19289F550	List: ML19289F549 ML19289F552
References
NUDOCS 7906110172
Download: ML19289F549 (2)

Text

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PHILAD ELPHI A ELECTRIC COM PANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 (215)041 4000 June 4, 1979

'l r . Boyce 11 . Grier, Director Office of Inspection and Enforcement Realon I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

SUBJECT:

Licensee Event Report Narrative Description The following occurrence was reported to ?f r . Greenman, Region I, Office of Inspection and Enforcement on May 18, 1979

Reference:

Docket Number 50-277 50-278 Report No: LER 2-79-25/1T-0 Report Date: June 4, 1979 Occurrence Date: May 18, 1979 Facility: Peach Bottom Atomic Power Station Units 2 and 3 R.D. 1, Delta, PA 17314 T<chnical Specification

Reference:

Technical Specification 3.9.B.4 states that "From and after the date that one of the diesel generators or associated e me r y,e n c y busses and eLther the emergency or startup power source are made or found to be inoperable for any reason, continued reactor operation is permissible in accordance with Specification 3.S.F provided the other off-site source, startup transformer and emergency transformer are available and capable of automatically supplying power to the 4 KV emergency busses and the AEC is notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the occurrence and plans for restoration of the inoperable components".

2231 045 7906110 \1QP-

Mr. Boyce 11 . Grier Page M

.Inne 4, 1979 LER 2-79-25/IT-0

';e s c r i,p t i o n of the Event:

Prior to the occurrence, Unit 2 was shutdown for a maintenance outage and linit 3 was operating at approximately 903 power. Unit 3 start up source was out of service and a safety block was beIng applied to permit routine preventive maintenance on the t rari smis s ion system. During this period, the E-2 diesel was running and supplying load on the E-23 emergency bus as a redundant source to ensure plant reliability. At 5:58 AM, a hydraulic fitting on the diesel control oil system developed a leak causing loss of control oil and a diesel trip.

Consequences of Event:

The E-2 diesel trip resulted in reactor operation with one itactop source and one diesel generator out of service. The trLp also caused a half scram and half isolation on I! n i t 3. The E-23 bus van immediately raenergized from the remaining off-site power source. The startup source that was out of service was restored by 6: 45 A rt . Safety significance is minimal due to the short period of time involved and because it is a permitted degraded condit ion.

t. .one of I.v e n t :

Cracks in a hydraulic fitting on the diesel governor booster out19 port cuased a loss of governor control oil which resulted in the trip)ing of the E-2 diesel.

Corrective Action:

The leaking governor fLtting was replaced. The diesel waa succe ,4rully tested and restored to service by 5:00 PM. The ren.iiuiun diesels were inspected for similar leaks, none were

[ o u n ti .

Yours truly, 2231 046

/ M . Coone Superintendent Generation Division-Nuclear A t L.1 c h tie n t er airector, NRC - Office of Inspection and Enforcement

r. Norman 11 . It a l le r , NRC - Office of !!a n ag e me n t 6 Program AnalysLs