ML20010B631

LER 81-025/03L-0:on 810714,during Leak Rate Testing,Several Valves Found Leaking.Caused by Sand Deposits on Seating Surfaces & Erosion of Valve Seats.Valves Repaired

ML20010B631
Person / Time
Site:	Cook
Issue date:	08/05/1981
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010B626	List: ML20010B625 ML20010B631
References
LER-81-025-03L-01, LER-81-25-3L-1, NUDOCS 8108170356
Download: ML20010B631 (2)

Text

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$0 d 60 61 COCK ET NUMSER sd 69 LV ENT D ATE REPORT C ATE EVENT DESCAIPTION AND PROBA8LE CONSEQUENCES ho io l 2 I l WHILE PERFORMING THE B & C LEAK RATE TECT,jEVERAL VALVES EXHIBITEb EXCESSIV I CAUSING THE TOTAL LEAK RATE TO EXCEED THE LIMIT IMPOSED BY TECHNICAL SPECIFICATIONS l l

,o ,,i l 3.6.1.2.b. SIMILAR OCCURRENCES INCLUDE: 50-315/81-11, 79-34, 78-37, 77-11, 76-23; I o;3, l 50-316/81-18, 79-53,20. l 1

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35 36 37 40 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i i ; o l l LEAK RATE TESTING INDICATED THAT VALVES IN THE NESW SYSTEM WERE THE f tAJOR CONTRIBUTOR TO I i,,,ilTHEEXCESSIVELEAKAGERATES. THESE EXCESSIVE LEAK RATES WERE ATTRIBUTED TO A C0llBINATION I

,,,, ; 0F SAND DEPOSITS ON THE SEATING SURFACES AND EROSION OF THE VALVE SEATS. THE VALVES l

,,,i l WERE REPAIRED BY CLEANING AND LAPPING THE SEATING SURFACES, OR GASKETS OR VALVE REPLACE- l

[,,,,; MENT. ALL OTHER VALVES EXPERIENCING EXCESSIVE LEAKAGE WERE (SEE ATTACHED SUPPLEMENT) l

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R. A. PALMER 616-465-5901  ?

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ATTACHMENT TO LER # 81-025/03L-0 SUPPLEMENT T0 CAUSE DESCRIPTION REPAIRED AND RETESTED WITH ACCEPTABLE LEAK RATES. AS THIRTEEN OF THE FOURTEEN NESW CHECK VALVES EXCEEDED GUIDELINE LEAKAGE DURING INITIAL TESTING, THESE VALVES WILL BE REPLACED WITH A DIAPHRAGil TYPE' VALVE. AN ENGINEERING REVIEW IS IN PROGRESS FOR THE REMAINDER OF THESE VALVES.

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