ML20024F377

LER 83-044/03L-0:on 830808,diesel Generator 12 Tripped on Low Jacket Cooling Water Pressure While Verifying Operability.Cause Not Stated.Coolant Jacket Vented & Large Amount of Air Found.No Evidence of leakage.W/830825 Ltr

ML20024F377
Person / Time
Site:	Calvert Cliffs
Issue date:	08/25/1983
From:	Porter R, Quimby C, Russell L BALTIMORE GAS & ELECTRIC CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-83-044-03L, LER-83-44-3L, NUDOCS 8309090325
Download: ML20024F377 (2)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 0 2 l At 0604, during normal operation, #12 Diesel Generator tripped on low l l 0 la l l _iacket cooling water pressure while ensuring its operability in prepara- l l 014 I l tion to remove #11 Diesel Generator for PMs. The redundant AC nower l 1015 l l sources were verified per T.S. 3.8.11.12. Diesel Generator was repaired, I l 0 l6 l l tested and returned to service at 1120. Unit 2 was at 100 per cent power. l l o l 7 l l Similar events: 50-317/76-36. l FOT8-;I I

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33 34 3 SS 3, 4. 41 42 43 44 4, CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l110ll Mechanics manually vented the coolant iacket and found a 1arce amount I l 111 l l of air. There was no evidence of coolant leakage. An FCR will provide l i 2 l constant venting to the exonnsion tnnk. l l11311 l lt14II I

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NAME oF PREPARER R. J. Porter /C. H. Quimby, Jr. PHONE: 301-269-4747/4816 I 8309090325 830825 l PDR ADDCK 05000317 S PDR

B ALTIMORE G AS AND ELECTRIC COMPANY P. O . B O X 1475 B A LTIM O R E, M A R Y L A N D 212o3 HUCLEAR power DEPARTMENT CALvERT CLIFFS NUCLEAR POWER PLANT LUSBY, M ARYL AND 20657 August 25, 1983 Dr. Thomas E. Murley Docket No. 50-317 Regional Administrator License No. DPR 53 U. S. Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406

Dear Dr. Murley:

Attached is LER 83-44/3L, as required per Technical specification 6.9.

Should you have any questions regarding this report, we would be pleased to discuss them with you.

Ve truly yours, A,- L. B. Russell Plant Superintendent

!' cc: Director, Office of Management Information and Program Control Messrs: A. E. Lundvall, Jr.

J. A. Tiernan l

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