ML19261F269

Abnormal Occurrence 74-03:on 740520,during Normal Surveillance Testing,Diesel Engine Tripped on Low Lube Oil Pressure.Caused by Disconnection of Switches from Sensing Lines.Engine Repaired & Restored to Svc.Personnel Briefed

ML19261F269
Person / Time
Site:	Three Mile Island
Issue date:	05/30/1974
From:	Arnold R METROPOLITAN EDISON CO.
To:
References
NUDOCS 7910250710
Download: ML19261F269 (4)

Text

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T UTION FC1 PART 50 DOCKET W. ,

(TEMPORARY FCD ) CONTROL NO: 4896

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FRCM: DATE CF ECC DATE REC'D LTR 11D10 RPT OT:C R Metropolitan Edison Company Reading, Pa. 19603 5-30-74 6-3-74 X R. C. Arnold TO: ORIG CC OTHER SENT AEC PDR X D. L. I signed SENT LOCAL PDRX CLASS UNCLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:

XXX 1 50-289 DESCRIPTION: ENC. OSURES :

Ler reporting abnormal occurrence A0-74-3 on 5-20-74, regarding inadequate administrative Control of Emergency Diesel Generator IB Maintenance........

ACKNOWLEDGED DO NOT REMOVE PLANT NAME: Three Mile Island Unit #1 FOR ACTION / INFO?l'_ATION 0-4-74 GC E'JTLER(L) /CIMENCER(L) ZIDi*NN(L) REGAN(E)

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Gentlemen: -

Operating License DPR-50 .

Docket No. 50-289 In acecrdance with Technical Specificaticus for the Wee Mile Island Nuclear Staticn Unit 1, we are reporting the follevin6 abnor=al cccurrence:

(1) Report Number: AC-Th-3 (2a) Report Date: May 30, 197h (2b) Occurrence Date: May 20, 19Th (3) Facility: Three Mile Island Nuclear Generating Station, Unit 1 (h) Identification of Occurrence:

Title:

Inadequate Administrative Centrc] of E=ergency Diesel Generater 13 Maintenance Type: Violatien of Technical Specificaticns, paragraph 6.2 3, which constitutes an abncr=al occurrence as defined by the Technical Specificaticus , paragraph 1.8g, in that the inadequate Administrative Centrol of E=ergency Diesel Generator 13 Maintenance =ay have threatened to cause an unsafe condition in the cperaticn of the plant.

(5) Conditions Prior to Occurrence: Ect shutdevn, with major plant parameters as follows:

Fover: Cere: C Elec: 0 , .. -

RC Flev: 10h x 1C #/hr. (3 R.C. Pu=ps) )48j }@}

RC Fressure: 2150 RC Temp.: 525 489d

[ Directorate of Licensing May 30, 197h PEZR Level: 120" PRZR Temp.: 6h6 F (6) Description of Occurrence: At 1900 cn May 19, 197h, during ner=al surveillance testing of the 13 Energency Dicsel Generator, it was discovered that the diesel engine would start as required but would not continue to run because of a 1cv lube oil pressure signal.

The diesel engine tripped en low lube oil pressure because three diesel engine lube oil pressure switches were disconnected frc=

their sensing lines. Investigation by the Plant Operations Review Cc==ittee (PCRC) revealed that the pressure switches had been mistakenly left disecnnected by =aintenance persennel on May 18, 197h, and that the maintenance Laing perfer=ed en the diesel engine at that time was not being dcne in accordance with an approved =aintenance procedure as required by the Technical Speci-ficaticcs and Station Ad=inistrative Precedures.

(7) Designation of Apparent Cause of Occurrence: Persennel (8) Analysis of Occurrence: The Energency Diesel Generatcr 13 was incapable of perfor=ing its design function for a period of approxi-

=ately h8 hcurs. This did not result in a threat to public health or safety because under the plant ecnditions that existed at the ti=e of thu occurrence, the diesels were not required to be operable in accordance with Section 3 7 of Technical Specifications. Further-

=cre, had a condition existed that required the diesel generators to be operable, Technical Specificatiens per=1t one diesel generater to be inoperable for seven days.

(9) Corrective Action: The Plant Operations Review Cc==ittee (PCRC)

=et prc=ptly after the incident and reccc= ended to the Plant Superintendent

a. a precedure to repair, test , and restere to service the Ener-gency Diesel Generater 13, and

b. that maintenance persennel involved in the incident be briefed en the i=portance of using approved procedures.

The Plant Superintendent concurred with PORC's recc==endations; the approved maintenance procedure was used to repair, test, 2nd restere to service Energency Diesel Generator 13; and =aintenance perscnnel were briefed on the i=pertance of using approved proce-dures.

In addition to the above acticas, the Statien Superintendent has instructed Statica F%nage=ent and Superviscry perscnnel to emphasize to these reporting to the= the i=pertance of perfer=ing vork in accordance with approved procedures. *

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- . Directorate of Licensing May 30, 197L (10) Failure Data: Not Applicable.

Sincerely, ROBER'2 C. AP5CLD Vice President-Generatien RCA:DNG:sh cc: Directorate of Regulatory Operations, Region 1 U. S. Atemic Energy Cen=ission 631 Park Avenue Kirc of Prussia, Pennsylvania 19h06

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