ML19220A618

Util-proposed Resolution of Original end-cap Cracking Problem in Circuit Breaker Devices Is Not Acceptable. Outlines Procedure to Be Implemented Before OL Is Issued

ML19220A618
Person / Time
Site:	Crane
Issue date:	09/24/1973
From:	Deyoung R US ATOMIC ENERGY COMMISSION (AEC)
To:	John Miller METROPOLITAN EDISON CO.
References
NUDOCS 7904240015
Download: ML19220A618 (1)

Text

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chet files (2)

AEC PDR Local PDR PWR-4 Rdg File RCDeYoung ASchwencer g p g 4 gj3 JHendrie Docket No. 50-239 AKenneke and 50-32r RWKlecker OGC 20 (3)

P'13ernero Metropolitan FAf en Company EGoulbourne ATT'.i : Mr. John G Miller ACRS (16)

Vice Presioent TR 3Cs P. O. Bo:c 542 JPan::arella Reading, Pennsylvanfa Centlemen:

On April 10, 1973, you wrote to Mr. James P. O'Reilly, Director Regian I, of our Directorate of Regulatory Operations in response to Bulletin No. 73-1 entitled, " Faulty Overcurrent Trip Delay Devico in Circuit Eran'ars for Engineered Safety Systems". Your letter indicated that you would rely on your initial inspection and a follow-up spac4al testing and inspection procedure to affirm that the original e=c cap cracking proble:s in the subject devices la resolved. We have evaluated pa proposed resolution of this problem and do not censider it acceptable. We feel that no compromises should be c:sde on breaker time dalay mach mic a, whose proper operation is essential to ensure the availability of engineered safety-related components during accident condit"' mis.

We do not consider periodie inspection and increased surveillance on installed, and in-service equipment, acceptable to detect manufacturing defects and cn-nl ative material fatigue.

An acceptable resolution of this matter would be to replace all the time delay dashpot end caps which were i=volved in the defective canufacturing process with new caps, whose time delay fu ction is factory tested to the requirements of A3SI C37.17, " Trip Devices for AC and DC Lov Voltage Power Cirenit 3raakars".

An acceptable resolution of this natter must be i= ole-cented before issuance of the operating license for the plant.

Please notify us within thirty (30) days of your intended course of action.

Sincerel-/,.

Orf ;inal signed by r

R. C. DeYoung R. C. DeToung, Assiatant Director for Pressuru ed Water Reactors Directorsta of Licensing cc:

Mr. Gerald Charnoff Shaw, Pitt=an, Potta b

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