05000366/LER-1980-026-03, /03L-0:on 800314 During Local Leak Rate Testing, Hydrogen Recombiner Return Isolation Valve 2T49-F005B Had Unacceptable Test Results.Caused by Scratch on Seat Apparently Due to Valve Closing on Piece of Debris

/03L-0:on 800314 During Local Leak Rate Testing, Hydrogen Recombiner Return Isolation Valve 2T49-F005B Had Unacceptable Test Results.Caused by Scratch on Seat Apparently Due to Valve Closing on Piece of Debris

ML19305C952
Person / Time
Site:	Hatch
Issue date:	04/02/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19305C951	List: 05000366/LER-1980-026, Forwards LER 80-026/03L-0 05000366/LER-1980-026-03, /03L-0:on 800314 During Local Leak Rate Testing, Hydrogen Recombiner Return Isolation Valve 2T49-F005B Had Unacceptable Test Results.Caused by Scratch on Seat Apparently Due to Valve Closing on Piece of Debris
References
LER-80-026-03L-01, LER-80-26-3L-1, NUDOCS 8004110476
Download: ML19305C952 (2)

LER-1980-026, /03L-0:on 800314 During Local Leak Rate Testing, Hydrogen Recombiner Return Isolation Valve 2T49-F005B Had Unacceptable Test Results.Caused by Scratch on Seat Apparently Due to Valve Closing on Piece of Debris

Event date:
Report date:
3661980026R03 - NRC Website

text

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT -

CONTROL BLOCK: l l

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60 61 OOCKET NUMBER 66 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEoVENCES h 10 I21 puring the performance of LLRTs while shutdown for a surveillance / vent i

10 : 3 l header deflector installation outage, hydrogen recombiner return isola-l [O l4 l $ ion valve 2T49-F005B did not have acceptable results ~ during its initial l lOls] gest.

There were no effects upon public health or safety due to this l

0 s pvent.

This is a repetitive event - see LER #50-366/1980-021.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lThe cause of the unacceptable leakage rate for this valve was a scratch 1 i O 11 111 I on the seat (apperently due to valve closing on piece of debris.)

Cor-1 i rective valve maintenance- (valv seat was lapped) was performed such I

i 2 til3i lthat the overall leakage rate for all Type B and C LLRTs will meet the l

FFTTlI.60La limit of Tech Specs section 3.6.1.2.b.1.

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% POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION li15I [G_j @ l 0l 01 0l @l NA l

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2 o 68 69 80 5 I 7 8 9 to C. L. Coquin. Suot. Plt. Eng. Serv. psons: 912-367-7781 I,

NAME OF PREPARER

LER F:

90 ~466/1080-026 Licensee:

Georgia Powe" Compan y Facility Nane:

Edwin I.

Hatch Docket A:

50 166

Narrative

Report for LER 50-366/1080-026,

On 3-13-80, with the unit in cold shutdown for a

surveillance / vent header deflector installation outage, local leak rate testing being performed per H ?!P-2-? Q 9 2, PRI'4 A R Y CONT AI'IMENT PERIODIC TYPE B AND TYPE C LEAKAGE TESTS, showed that hydrogen recombiner "eturn isolation valve 2Tho-F0n9B was leaking in excess of specified criteria

("As Found" leakage was greater than 2200 actual cubic centimeters oer minutel.

Valve 2T4o-F004B is actually the isolation valve being tested;

however, 2Tho-F0053 is the " blocking valve" used as part of the boundary in order to test the F004B valve.

Thus, the Icakage must be attributed to both valves.

i The Icakage of valves 2T4Q-F004B and F005B is included as part of the.60La limit of Tech Specs section 3.6.1.2.b.1 This is a repetitive occurrence - see LER #go-966/1080-021 There was no effect upon public health or safety as a result of this event.

The cause of the unaccentable leakage rate for the valve was a scratch on the seat (apoarently due to valve closing on piece of debris).

Corrective maintenance consisted of lapping the valve seat.

The after-maintenance leakage was 20 actual cubic centimeters per minute.

This is not gen e r i,c a l t h ois::,h valve leakage during LLRTs is common to both units.

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