ML20084S551

RO 50-254/76-26:on 760803,rod Worth Minimizer Multiple Output Distributor Error Detected.Caused by Burned Out Wire Runs on Relay Board.Board Repaired & Hardware & Software Mods & Procedural Changes Being Considered

ML20084S551
Person / Time
Site:	Quad Cities
Issue date:	08/16/1976
From:	Kalivianakis N, Spedl G COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S535	List: ML20084S542 ML20084S551
References
NJK-76-303, RO-50-254-76-26, NUDOCS 8306170104
Download: ML20084S551 (2)

Text

p-~n Com :lth Edis:n (a

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, Guad-Ci Nuclear Power Stat +on O

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Post Office Box 216 C -

Cordova, Ilhnois 61242 i Telephone 309/654-2241 SEFILL NJK-76-303 ,,s , '

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August 16, 1976 ((1 ,fi /J. +

0 Auc n ,_[. %lL)

J. Keppler, Regional Director 9, JM OD;%,

Office of Inspection and Enforcement f, y Region lil ' >/ cf U. S. Nuclear Regulatory Commission O.1 V 799 Roosevelt Road Glen Ellyn, Illinois 60137

Reference:

Quad-Cities Nuclear Power Station Docket No. 50-254, DPR-29, Unit 1 Appendix A Sections 3.3.B.3.b, 6.6.B.I.b Enclosed please find Reportable Occurrence Report No. 50-254/76-26 for Quad-Cities Nuclear Power Station. This occurrence was previously reported to Region 111, Office of Inspection and Enforcement by telephone on August 4, 1976 and by telecopy on August 4, 1976.

This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.1.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION f b W!

N. J. Kallvianakis V Station Superintendent [f COPY SENT REGIO _ 'JJ .,

NJK/GS/lk cc: G. A. Abrell 8306170104 770318 l DR ADOCK 05000 gQ3 l

l AUG 181976

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- Oticensee even1 negonr O CONTROL 8 LOCK:l l l l l l l (PLEASE PRINT ALL REGUIRED INFORMATION) 1 8 AME LCENSE NUMBER PE TY

'O ll lLlQlAlDl1l l 0l 0l-l0 l 0 l 0 l 0 l 0l-l 0l 0] l4 l1 l0 l0 l0 l lQl1l 7 89 14 15 25 26 30 31 32 ..

CATEGORY T Pf S COCKET NUMBER EVENT DATE REPORT OATE O CON'Tl 7 8 57 l

58 l W 59 lLl 60 l0 l5 l0 l-l0 l2 l 5 l 41 l 0l 8l 0l 3l7 l6 l l 0 l 8l 1l 6l 7l 6l 61 68 69 74 75 80 EVENT OESCRIPTION DE l A rod worth minimizer multiple output distributor error was detected by the rod l 7 89 80 M l worth minimizer during withdrawal of the first twelve control rods during a unit l 7 89 80 BE l startup. Control rod blocks were not. received, and the rod worth minimizer display l 7 89 80

@ l of the sixth rod did not change for subsequent rod withdrawals. The rod worth 7 0 80 l

@9l minimizer was rendered inoperable. (R0 50-254/76-26) l 7 89 Pseus 80 OCE COMPONENT CODE MANurACTufER VIOLATON SE l Rl Bl W 7 89 10 11 lZlZlZl Zl Zl Zl 12 17 W 43 lGl0l8l0l 44 47

{48 CAUSE DESCRIPTION 3G l (Proximate Cause-Equipment Failure) A drifting power supply resulted in burned out l 7 89 80 32 l wire runs on a relay board responsible for supplying rod blocks in the event of a l 7 89 80 D2 l multiple output distributor error. The power supply was replaced and the relay l 5  % POWER QTHER STATUS DISCOVERY OtSCOVERY OESCRIPTON 09 d l0 l0l0l l NA l lA_j 45 l NA 80 l

7 8 9 10 12 13 44 46 REL 0 OF SE AMOUNT OF ACTMTV lot.;ATON OF RELEASE B5 tz_J LZJ l NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMSER TYPE DESCRIPTON DE l 0l 0l 0l 7 89 11 Wl 13 12 NA 80 l

PERSONNEL INJURIES NUM8ER DESCRIPTCN K l 0l 0l 0l l NA l 7 89 11 12 80 OFFSITE CONSEQUENCES gg l Z l 7 89 80 LOSS OR OAMAGE TO FACILITY TYPE DESCRIPTON

@ d -l 7 89 10 NA 80 l

PU8UCITY 1 35 l- NA l 7 89 80 ADOITIONAL FACTORS 18 l (CAUSE DESCRIPTION cont) board repaired. Hardware and software modifications as l well as procedural changes are being considered such that the above described DE -l fRilure does not render the rod worth minimizer inoperable. l.

-7 89 80 Gary Spedi 309-654-2241 EXT. 242 ePo ees. o.T

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