IR 05000249/2019076
| 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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Edison Dresden Nuclear Power Station R.R. #1 . Morris, Illinois 60450 Telephone 815/942-2920
\. \ BBS Lt December 2, 1976 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations-Region U. S. Nuciear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois . 60137 III Enclosed please find Reportabie Occurrence report number 50-249/1976-3 This report is being submitted to your office in accordance with the Dresden NucJear Po"wer Station Technical Specifications, Section 6.6.B. t 7. / Dresden Nuclear Power BBS :jo Enclosure cc: Director of Inspection
& Enforcement -Director of Management Information
& Program Control File/NRG .:. 12503
... " REPORT. _ ,. -LICENSEE EVENT CC?NTROL BLOCK: I I I I I I I (PLEASE PRl;ilT AU REQUIRED INFORMATION) -. ..:::..J-1 6 LICENSEE * LICENSE NAME LICENSE* NUMBER TYPE @El IIILIDIRISl31 IOIOl-10101010101-10101 l.Lf I I 11 1111 I 7 8 9 *'* 14 . 15 25 26 . . 30 CATEGORY REPORT TYPE. REPORT SOURCE DOCKET NUMBER EVENT DATE EVENT TYPE 1011 I .31 32 REPORT DATE @ill CON'T ,. 1: I lIJ lbJ ll l1 IJ l'll71(,I It l.2IOl.ll71(;1 7 8 57 58 59 60 61 . 68 *. 69 74 75 * ... BO EVENT DE 0 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 RED oti.J uN 1T-:&. CR. o. "REPORT No. so-I Jo14! ! A HPc1 . t..o<Yt * DEs1r;,AJ WtRrN<r 'PRoBLE m 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 BO SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT COOE SUPPUER MANUFACTURt:R VDLATION @0 JSIFI lru !VIA ILIVl*EIXI l!{J Ci 151 Ltll 7 8 9 10 .. 11 . 12 17 43 44 .47 48 . CAUSE DESCRIPTION lalBI* I VA.LV6 WlO 3-.1301-S<.
WAS R!3'CK OUT aF SERVICE IN T/'f-£ OPEN f>OSI 7 B 9 . * BO .
AND VAJ-,Vi:;
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\TTAat SHEET BO FACILllY METHOD OF STATUS % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION EEJ [g_J IOl'JIJ.fl Jvlt. I /I/If 7 8 9 10 12 13. 45 46 80 FORM OF ACTIVITY CONTENT E@l RELEASED OF RELEASE AMOUNT *OF ACTIVITY I * l&J 01 Nit . LOCATION OF RELEASE , .. , )./If 7 8 9 10 11 44 45 BO. PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION
[!@} l,O 1.0 ID I* LZJ I Nil 7 . 8: 9 11 12 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 7 8 9 80 7 89 80. NAME: /£RJ2.ilN £, LANG-.. ,.. , .......
-...
' I \ _, ... __:;.,,..:
EVENT DESCRIPTION (Continued)
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 eral other valves were oversized for the valve application 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 This is-not a repetitive occurrenc CAUSE DESCRIPTION (Continued)
will be inspected and, if necessary, replace 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 sized motor operator 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. *