ML19210B386

Clarifies Intended Action at TMI-1 Re Replacement of Time Delay Dashpot end-caps Contained on Engineered Safeguard Circuit Breakers.Will Replace Only end-caps on Westinghouse DB-50 Circuit Breakers

ML19210B386
Person / Time
Site:	Three Mile Island
Issue date:	02/12/1974
From:	Arnold R METROPOLITAN EDISON CO.
To:	Deyoung R US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 7911070708
Download: ML19210B386 (2)

Text

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.. AEC DIS" 3UTIC t FOR PART 50 DCCKET PATET }

(TDiPORARY FORM) CONTROL NO: 1245 FILE:

FROM: DATE CF DOC DATE PIC'D LTR M.W 0 RPT OniER Metropolitan Edison Conpany Readig . Pa. 19603 2-12-74 2-15-74 X R. C. Arnold TO: ORIG CC OTHER SENT AEC PDR X R. C. DeYoung 1 signed SENT LOCAL PDR X CLASS L3 CLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:

YJ.x 1 50-289 DESCR1? %uN: ENCLOSUPIS:

Ltr re their 10-24-73 itr, furnishing info .

regarding the replacceent of time delay dash-pot end caps contained on engineered safe-guard circuit breakers..............

DO EUi RE10VE NUTE: Same Dist as their 10-24-73 ltr A.CKNOWLEDGED PLANT NAME: Three Mile Island Unit #1 FOR ACTICN/INFOT24ATICN 2-15-74 GC BUTLER (L) ./SC154ENCER(L) ZIDIANN(L) REGAN(E)

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POST OF*lCE BOX 542 RE ADING, PENNSYLVANI A 19603 TELEPHONE 215 - 929-300r]'$ f, February 12, 197h f --- , y,

                                                                                                                                     # 7 b,, i /p L'r. R. C. DeYoung, Assistant Director                                                .Ly' ht Q %

k:.; j g lO [ p,f . c .l for Pressurized Water Reactor: gy ' Dircctorate of Licensing (C. , -a. f A5 Office of Regulations \p ', / United States Atomic Energy Commission 4 '% A [V/ Washington, D.C. 205L5 /gt Subj ect : 'J'hree Mile Island Nuclear Station Unit 1 Faulty Overcurrent Trip Delay Devices in Circuit Breakers - Docket No. 50-289

Dear Mr. DeYoung:

References : (a) AEC letter of September 24, 1973 R. C. DeYoung to Metropolitan Ediscn Company - Mr. J. G. Miller (b) Metropolitan Edison Cc=pany letter of October 2h ,1973 - Mr. J. G. Miller to Mr. R. C. DeYoung, U.S. AEC This letter la being sent to clarify our intended action at "'hree Mile Island Unit 1 regarding the replacement of time delay dashpot end caps centained on engineered safeguard circuit breakers. Reference (a) suggested that an acceptable resolution to the AEC would be to replace all time delay dashpot end caps which were involverf in the defective manufacturing prccess with new caps, whose time delay function is factory tested to the requirenents of ANSI C37.17. Our response to the AEC contained in reference (b) indicated that we would replace all time delay dashpot end caps on engineered safeguard circuit breakers. Subsequent discussicn with Westinghouse Switchgear Division indicated that only type DB-50 circuit breakers experienced the cracked end cap problem with which you are familiar. We are, therefore, only replacing time delay dashpot end caps on Westinghouse DB-50 circuit breakers contained on engineered safeguard circuit breakers. The replace-ment end caps vill, as we stated in reference (b), be factory tested to the require-ments of ANSI C37.17 Very truly '/ours, 1584 333 t I x.,.a ~ R. C.' hinold 3o.n RCA:nh Vice President ec: Messrs. J. ',. Miller W. A. Verrochi J. P. O'Reilly}}