05000316/LER-1979-053-03, /03L-0:on 791226,while Performing Type B & C Leak Tests Several Valves Exhibited Leakage Exceeding Tech Spec Limit.Caused by Sand Deposits on Valve Seating Surfaces & Pitted Valve Seats on Check Valves

/03L-0:on 791226,while Performing Type B & C Leak Tests Several Valves Exhibited Leakage Exceeding Tech Spec Limit.Caused by Sand Deposits on Valve Seating Surfaces & Pitted Valve Seats on Check Valves

ML17326A468
Person / Time
Site:	Cook
Issue date:	01/17/1980
From:	Rischling J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A467	List: 05000316/LER-1979-053, Forwards LER 79-053/03L-0 05000316/LER-1979-053-03, /03L-0:on 791226,while Performing Type B & C Leak Tests Several Valves Exhibited Leakage Exceeding Tech Spec Limit.Caused by Sand Deposits on Valve Seating Surfaces & Pitted Valve Seats on Check Valves
References
LER-79-053-03L, LER-79-53-3L, NUDOCS 8001250468
Download: ML17326A468 (3)

LER-1979-053, /03L-0:on 791226,while Performing Type B & C Leak Tests Several Valves Exhibited Leakage Exceeding Tech Spec Limit.Caused by Sand Deposits on Valve Seating Surfaces & Pitted Valve Seats on Check Valves

Event date:
Report date:
3161979053R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION I7.i',i P

[CENSEE EVENT REPORT e/*

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{PLEASE PRINT OR TYPE ALLREQUIRED INFORMATIONI I

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LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES &10 WHILE PERFORMING THE T>PE B AND C L&K TEST SEVERAL VALVES EXHIBITED EXCESSIVE LEAKAGE CAUSING THE TOTAL AS FOUND LEAK RATE TO EXCEED THE LIMIT SPECIFIED IN T. S, 3.6.1.2.b.

SIMILAR OCCURRENCES INCLUDE: 050-0315/76-23,77-11, 78-37 AND

~pg 73-34 060-0316/79-20.

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SYSTEM

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CODE TYPE NO.

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CAUSE

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THE MAJOR SOURCE OF EXCESSIVE LEAKAGE WAS FOUND TO BE THE NESW CHECK VALVES.

TWELVE OF FOURTEEN NESW CHECK VALVES WERE FOUND TO HAVE'EXCESSIVE LEAKAGE RATES.

THIS IS DUE TO SAND DEPOSITS ON VALVE SEATING SURFACES AND PITTED VALVE SEATS

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3 OTHER VALVES WHICH INDICATED EXCESSIVE LEAKAGE RATES WERE RANDOM IN NATURE AND NO DISCERNABLE PATTERNS ARE EVIDENT.

SEE ATTACHED SUPPLEMENT.

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29 NA 44 cD Q ~Q KQ ACTIVITY CONTENT RELEASED OF RElEASE AMOUNTOF ACTIVITYQ35 6

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10 11 45 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39

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11 12 13 PERSONNEL INJURIES DISCOVERY DESCRIPTION Q32 SURVEILLANCE TEST lOCATIONOF RELEASE Q 80 80 80 80 7

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L. Rischling NAME OF PREPARER 80 80 NRC USE ONLY 80 ER 0

61 6-465-5901 PHONE:

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SUPPLEMENT TO LER ¹79-053 03L-0 SUPPLEMENT TO CAUSE DESCRIPTION AFTER INITIAL TESTING, THE VALVES EXHIBITING AN EXCESSIVE LEAKAGE RATE WERE EITHER REPAIRED OR REPLACED.

UPON THE COMPLETION OF VALVE

REPAIRS, THE FINAL COMBINED TYPE B AND C LEAKAGE WAS.223 L, WHICH IS WELL BELOW THE.6 L

T.S. LIMIT.

PRESENTLY, THERE IS AN ENGINEERING STUDY IN PROGRESS TO EVALUATE THE NESW SYSTEM:

ANALYZE THIS SITUATION AND DEVELOP APPROPRIATE ALTERNATIVES.

NO FURTHER ACTIONS ARE CURRENTLY PLANNED.

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