ML17252A270

Transmittal of Reportable Occurrence Report No. 50-249/1976-34

ML17252A270
Person / Time
Site:	Dresden
Issue date:	12/02/1976
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
50-249/1976-34
Download: ML17252A270 (3)

Text

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Common~ec9 Edison Dresden Nuclear Power Station R.R. #1

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. Morris, Illinois 60450 Telephone 815/942-2920

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BBS Ltr. #76-~44 December 2, 1976 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U. S. Nuciear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois . 60137 Enclosed please find Reportabie Occurrence report number 50-249/1976-34.

This report is being submitted to your office in accordance with the Dresden NucJear Po"wer Station Technical Specifications, Section 6.6.B.

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Dresden Nuclear Power S~ation BBS :jo Enclosure cc: Director of Inspection & Enforcement

-Director of Management Information & Program Control File/NRG 12503

" REPORT.

_ ,. -LICENSEE EVENT

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CC?NTROL BLOCK: I I I I I I I (PLEASE PRl;ilT AU REQUIRED INFORMATION)

- . ..:::..J-1 6 LICENSEE

• LICENSE EVENT NAME LICENSE* NUMBER TYPE TYPE

@El IIILIDIRISl31 IOIOl-10101010101-10101 l.Lf I I 11 1111 I 1011 I 7 8 9 *'* 14 . 15 25 26 . . 30 .31 32 REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NUMBER EVENT DATE REPORT DATE

@ill CON'T ,. 1: I lIJ lbJ IOl5IOl~IOl:tl41'll ll l1 IJ l'll71(,I It l.2IOl.ll71(;1 7 8 57 58 59 60 61 . 68 *. 69 74 75 * ... BO 0

EVENT DE SCRIPTION

• fol2l I AS A 'R.£SULT OF THE .l301-<6 HPCI. INIEC..TION VALVE STEM FAILURE! .

7 8 9 . ' ' 80

@El I i-rHAT WAS. "R.EC.E.NTJ. .y Dtscov~ RED oti.J uN 1T-:&. CR. o. "REPORT No. so- I Jo14! 2~:r/r9?-C-b'-) 7 . A HPc1 . t..o<Ytc..

• DEs1r;,AJ WtRrN<r 'PRoBLE m w~ rDc:tJ-:J 10151* li1'FtED WHfCH WAS:. B£/..J£YED TI2 BE commoN Th BoTH UNIT-J... AND I 7 8-9 ** . . BO lol6l lvNrt-3', IH£ WIRING £RROR J WH'ICl.:i DID IN P°"AC.T 'FX_lST oAJ VNlt-3 7 I 7 8 9 . . . PRIME (SEE ATTPiC.tiED ~kEJ21} BO SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT COOE SUPPUER MANUFACTURt:R VDLATION 7

@0 JSIFI 8 9 10 .

lru 11 . 12

!VIA ILIVl*EIXI 17 l!{J 43

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. CAUSE DESCRIPTION lalBI* I VA.LV6 WlO 3-.1301-S<. WAS R!3'CKE.D OUT aF SERVICE IN T/'f-£ OPEN f>OSI ~I 7 B 9 .

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. .[~I~ltnoAJ AND VAJ-,Vi:; ~30f~q. WAS'(.,L..OSEb TO !SOt..,ATE:; THE HPCI 'PUm'P DISCHARc;tJ 7 8 9 ' 80

~ i UR1JJ6- THE E'x £ STE: OF VALVE.

7 8 9 (StSE:. l\TTAatE.D SHEET BO FACILllY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION

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/I/If 80 FORM OF E@l *l&J ACTIVITY RELEASED CONTENT OF RELEASE 01 AMOUNT *OF ACTIVITY Nit I )./If

. LOCATION OF RELEASE 7 8 9 10 11 44 45 BO.

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

[!@} l,O 1.0 ID11I*

7 . 8: 9 LZJ 12 I Nil 1-3--~~-~,..,.-----------------------,~80 PERS'ONNEL INJURIES

. NUMBER DESCRIPTION BE IO 1010 I ___M_'.4_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ,.----1 7.* 9,9 11 12 . ea OFFSITE CONSEQUENCES

.[ill] .M 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION E@.. !ZJ .______;,M_Yl-_ _ _ _ _ _ _ __,,___,,_______________ -..J 7 8 9 10 80 PUBLICITY *~*

[ill] .Al.4 7 8 9 80 ADDITIONAL FACTORS

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I EVENT DESCRIPTION (Continued)

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may have caused the 23*01-8 valve to oscillate open/ closed during refueling surveillance testing of the HPCI turbine ttip circuitry. -It had been determined prior to the Unit-2 failure that the motor operators for valve 2301-8 and sev-eral other saf~ty-related valves were oversized for the valve applications. It is conceivable that the oversized operator might subject the valve stem to higher stresses under conditions such as excessive cycling. To preclude a failure of the 2301-8 valve in the closed position, the valve was opened and racked out of servic~. This is- not a repetitive occurrence. (50~249/1976~34)

CAUSE DESCRIPTION (Continued) 3~2301-8 will be inspected and, if necessary, replaced.

A modification request has been submitted to alter the 2301-8 valve control circuitry so as to eliminate excessive cycling during rqutine surveillance testing.

Furthermore, a modification request has been initiated to replace the motor operators on several safety-related valves with reduced-capacity units. Completion of this modification will preclude valve stem overstressing which might result from over-sized motor operators. Valve MO 3-2301-8 is a Crane 14-inch gate valve, equipped with a Liinitorque SMB-4 motor operator rated at 200 ft-.-lb. *