05000245/LER-1981-008, Forwards LER 81-008/03L-0.Detailed Event Analysis Encl

Forwards LER 81-008/03L-0.Detailed Event Analysis Encl

ML20004B953
Person / Time
Site:	Millstone
Issue date:	05/26/1981
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20004B954	List: 05000245/LER-1981-008, Forwards LER 81-008/03L-0.Detailed Event Analysis Encl 05000245/LER-1981-008-03, /03L-0:on 810427,during Routine Surveillance, Engine Tripped on High Crankcase Pressure.Caused by Defective Crankcase Ejector Air Hoses.Hose Replaced.Diesel Generator Operational Demonstration Completed
References
MP-1-1786, NUDOCS 8106010349
Download: ML20004B953 (2)

LER-1981-008, Forwards LER 81-008/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2451981008R00 - NRC Website

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May 26, 1981 MP-1-1786 Mr. Boyce H. Grier Director, Region I Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Provisional License DPR-21 Docket No. 50-245 Reportable Occurrence R0-81-08/3L

/Dear Mr. Grier:

This letter forwards the Licensee Event Report for Reportable Occurrence R0-81-08/3L required to be submitted within 30 days pursuant to the requirements of the Millstone Unit 1 Technical Specifications, Section 6.9.1.9.b.

An additional three copies of the report are enclosed.

Yours truly, NORTHEAST NUCLEAR ENERGY COMPANY p.o J. Mroczka Station Superintendent EJM/MJB:mw

Attachment:

LER R0-81-08/3L Director, Office of Inspection and Enforcement, Washington, cc:

D.C. (30)

Director, Office of Management Information and Program Control, Washington, D.C.

(3)

U. S. Nuclear Regulatory Commission, c/o Document Management Branch, Washington, D.C.

20555 8106003 %I

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ATTACHMENT TO LER 81-08/3L NORTHEAST flVCLEAR EllERGY COMPANY MILLSTONE NUCLEAR POWER STATION - UNIT 1 PROVISIONAL LICEllSE flVMBER DPR-21 DOCKET flVMBER 50-245 IDENTIFICATION OF OCCURRENCE Operation in a degraded mode permitted by a limiting condition for operation occurred when the emergency diesel generator failed to start.

CONDITIONS PRIOR TO OCCURREllCE Prior to the occurrence, the unit was in cold shutdown for performance of main turbine repairs.

pESCRIPTION OF OCCURRENCE On April 27,1981, at.1230 hours0.0142 days <br />0.342 hours <br />0.00203 weeks <br />4.68015e-4 months <br />, while performing routine surveillance, Diesel Generator Operational Readiness Demonstration, the engine tripped on high crankcase pressure. Technical Specification 4.9.1.a requires that the diesel generator be started and loaded once a month to demonstrate operational readiness.

DESIGflATION OF APPARENT CAUSE OF OCCURRENCE The Diesel Generator engine tripped on high crankcase pressure due to defective hoses on the crankcase ejector, which allowed air leakage.

ANALYSIS OF OCCURRENCE The Diesel Generator is provided to insure adequate power for operation of emergency safeguards equipment.

Failure to successfully demonstrate operational readiness of the Diastl Generator did not result in a condition that had not been previously analyzed. The Gas Turbine Generator as well as off-site power sources were available and would have provided adequate power for operation of this equipment if the need had arisen.

CORRECTIVE ACTION

The defective ejector air hose was replaced and the Diesel Generator operational readiness demonstration was successfully completed. An improved air hose supplied by the vendor has been installed to reduce the potential for this type of failure.

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