05000316/LER-1979-020-03, /03L-0 on 790615:several Valves Exhibited Excessive Leakage,Causing as-found Leak Rate to Exceed Limit.Major Source of Leak Attributed to Check Valves.Caused by Sand Deposits on Seating Surfaces & Pitted Seats

/03L-0 on 790615:several Valves Exhibited Excessive Leakage,Causing as-found Leak Rate to Exceed Limit.Major Source of Leak Attributed to Check Valves.Caused by Sand Deposits on Seating Surfaces & Pitted Seats

ML17317B330
Person / Time
Site:	Cook
Issue date:	07/13/1979
From:	Bellman T INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B329	List: 05000316/LER-1979-020, Forwards LER 79-020/03L-0 05000316/LER-1979-020-03, /03L-0 on 790615:several Valves Exhibited Excessive Leakage,Causing as-found Leak Rate to Exceed Limit.Major Source of Leak Attributed to Check Valves.Caused by Sand Deposits on Seating Surfaces & Pitted Seats
References
LER-79-020-03L-01, LER-79-20-3L-1, NUDOCS 7907190537
Download: ML17317B330 (4)

LER-1979-020, /03L-0 on 790615:several Valves Exhibited Excessive Leakage,Causing as-found Leak Rate to Exceed Limit.Major Source of Leak Attributed to Check Valves.Caused by Sand Deposits on Seating Surfaces & Pitted Seats

Event date:
Report date:
3161979020R03 - NRC Website

text

U. S.

LEAR REGULATORY COMMISSION tCFNSEF. fVENT REPORT Q1 (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6 0

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Qs 25 26 LICENSE TYPE 30 57 CAT 58 NRC FORM 366 37.77) 4 A CONTROL BLOCK:

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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 PERFORMXNG THE TYPE B ANl5 C LEAK RATE TEST SEVERAL VALVES

~O3 EXHIBITED EXCESSIVE LEAKAGE CAUSXNG THE TOTAL AS FOUND LEAK RATE TO EXCEED THE LIMIT IMPOSED BY T. S.

3. 6. 1.2 b.,

SIMILAR OCCURRENCES

~O6 INCLUDE: 050-0315/76-23,77-11 AND 78-37.

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8 80 9

t SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~SD Q11 E

Q12

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Q74 pJ Qs ~ Qs 9

10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LFRIRP EVENTYEAR REPORT NO.

CODE TYPE NO.

Q17 887997 ~

+

~02 0

21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDP PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER Q18 ~Z Q19

~ZQ29

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0 0

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~Y Q23

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9 Q 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 THE MAJOR SOURCE OF LEAKAGE WAS ATTRIBUTED TO THE NESW CHECK VALVES (LUNKENHEIMER MODEL N1573C-61/65-994)

AND SEVERAL FISHER VALVES (MODEL 5 76-10).

THE NESW CHECK VALVES WERE REPLACED WITH MARLIN 80 METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q32

~BQ31 SURVEILLANCE TEST 45 46 80 45 80 80 80 80 NRC USE ONLY 80 o

0 68-69 616-465-5901 T. P. Beilman NAME OF PREPARER COMPANY VALVES WHXCH.ARE FELT TO CONTAIN SUPERIOR MATERIALS.

THE FXSHER VALVES SEATS WERE CLEANED

(

SEE SUPPLEMENT) 77 8

9 FACILITY STATUS Ts POWER OTHER STATUS Q

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Q29 7

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10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ LOCATIONOF RELEASE Q Pgg

'339

'Q34 NA NA 7

8 9

'10 44 PERSONNEL. EXPOSURES NUMBER TYPE

DESCRIPTION

7 ~00 0

Q37 Z

Q3s EA 7

8 9

11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION Q41 8

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Qs NA 7

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11 12 LOSS OF OR DAMAGETO FACILITY 43 7

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10 PUBLICITY ISSUED DESCRIPTIONQ mZ WNQ44 NA 7

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SUPPLEMENT TO LER 879-020/03L-0 SUPPLEMENT TO CAUSE DESCRIPTION AND THE VALVES WERE RESTROKED.

THE "AS LEFT" DATA FOR BOTH TYPES WAS WITHIN LIMITS.

THE

CAUSE

OF THE NESW CHECK VALVE LEAKAGE WAS ATTRIBUTED TO A COMBINATION OF SAND DEPOSITS ON THE SEATING SURFACES AND PITTED SEATS AND/OR FLAPPERS.

REPLACEMENT OF THE VALVES SHOULD PRECLUDE RECURRENCE.

IN ADDITION TO THE REPAIR/RESTROKING OF THE FISHER VALVES A PRE-CAUTIONARY MEASURE OF INSTALLING SERRATED EDGED WASHERS ON THE ACTUATOR MOUNTING BOLTS OF THE VALVE ACTUATORS IS BEING PERFORMED.

THIS REDUCES OR ELIMINATES ACTUATOR BODY MOVEMENT DUE TO VALVE TRAVEL AND WAS PREVIOUSLY PERFORMED ON UNIT ONE WITH SUCCESSFUL RESULTS.

THE REMAINING VALVES FAILURES WERE RANDOM IN NATURE AND DID NOT SIGNIFICANTLY CONTRIBUTE TO THE OVERALL LEAKAGE VALUE.

NO FURTHER ACTION IS CURRENTLY PLANNED IN ADDITION TO THAT ALREADY PERFORMED.

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