ML19253C338

LER 79-103/03L-0:on 791024,makeup Pump MUP-1B Discharge Line Vent Valve MUV-291 Found Leaking.Caused by Cyclic Vibration Fatigue.Makeup Pump Returned to Svc.Engineering Evaluation Underway

ML19253C338
Person / Time
Site:	Crystal River
Issue date:	11/16/1979
From:	Lancaster K FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19253C335	List: ML19253C334 ML19253C338
References
LER-79-103-03L, LER-79-103-3L, NUDOCS 7911300577
Download: ML19253C338 (2)

Text

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• Iceneral nublic as rodundant makeun pumos MUP-1A and MUP-lC were operable. This I o es I is the fourth occurrence of this type reported for MUP-1B. Peference LER's 79- I I 63, 82 and 93. I ai I

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SUPPLEMENTARY INFORMATION REPORT NO: 50-302/79-103/03L-0 FACILITY: Crystal River Unit 3 REPORT DATE: 16 November 1979 OCCURRENCE DATE: 24 October 1979 IDENTIFICATION OF OCCURRENCE: Degradation of the makeup system (makeup pump 1B discharge line vent valve MUV-291) reportable under Technical Spec-ification 6.9.1.9.d. CONDITIONS PRIOR TO OCCURRENCE: Mode 1 power operation (100%). LESCRIPTION OF OCCURRENCE: At 1735 during routine power operation, a leak was discovered on makeup pump 1B discharge line vent valve MUV-291. Further investigation revealed that the leak originated from a failure in the weld area near the root of the weld. The crack was repaired through modification 79-10-84. Maheup pump 1B was returned to service at 1340 on 30 October 1979 following sat-isfactory completion of SP-340. DESIGNATION OF APPARENT CAUSE: The cause of this event is attributed to cyclic vibration fatigue. ANALYSIS OF OCCURRENCE: No effect upon the plant or general public as redundant makeup pumps MUP-1A and MUP-1C were operable. CORRECTIVE ACTION: Request for ent.ineering information 79-7-7 has been submitted to evaluate this event. Corrective action will be taken upon completion of this evaluation and submitted as a supplement to this report. FAILURE DATA: This is the fourth occurrence of this type reported for MUP-1B. Reference LER 79-63, 82 and 93.

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