ML20085C867

Telecopy Ao:On 741216,rod Worth Minimizer Computer Failed & Did Not Annunciate W/Startup Below 10% Power,Allowing Operator to Withdraw out-of-sequence Rod W/O Block or Alarm. Error Corrected within 2 H

ML20085C867
Person / Time
Site:	Quad Cities
Issue date:	12/16/1974
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085C865	List: ML20085C862 ML20085C867
References
NJK-74-417, NUDOCS 8307130175
Download: ML20085C867 (1)

Text

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- - Commepw'ealth Edison i

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-# Telephone 309/ 654-2241

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(Q N t Telecopy: Region III, Attention: Mr. C. Feierabend D) s December 16, 1974  ;

J. Keppler, Regional Director Directorate of Regulatory Operations Region III '

U. S. Atomic Energy Commission j 799 Roosevelt Road ,

Glen Ellyn, Illinois 60137

Reference:

Quad-Cities !iuclear Power Station, . Unit 1  !

Docket !!o. 50-254, DPR-29  :

Appendix A, Sections 1.0.A.2, 3 3.B.3.b., 6.6.B.l.a

Dear l's . Keppler:

The purpose of this letter is to provide you with notificaticn of an Abnormal Occurrence as required by Technical Specification 6.6.B.l.a within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the occurrence.

While pulling rods for startup of Unit 1 on December 16, 1974 r the RWH computer failed and did not annunciate. This failure l of the RWM occurred during startup below 10% power and allowed the operator to withdraw an out-of-sequence rod without a rod block or alarm. This move occurred 5 rods after the RWM failure.

~

The rod sequence error was recoEnized by visual observation of the rod position display panel. The out-of-sequence rod i was returned to its in-sequence position and the RWM was re-turned to operation. This error was corrected within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

L I

This occurrence was discussed by telephone with Mr. Knopp of your. office on December 16, 1974. Further information will be i provided by Abnormal Occurrence Report A0 50-254/74-39 which will  !

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Of be submitted within 10 days of the date of this occurrence.

E.

O .Very truly yours, '

$n COICIOHWEALTH EDISO:! COMPAi!Y ,

0 QUAD-CITIES ,N' CLEAR POWER STATION c

r '/I i ,;th% ( -

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• < N. J. Kalivianakis >

Station Superintendent -

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ma.m NJK/BBP/1k cc: Directorate of Licensing

'J. .S. cAbel g .

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// O [tfQu:d Citi car Powot Station N Post Othec 216 d' i/ 7 Cordova, Illinois 61242 l Telephone 309/654-2241 y V l

NJKL 74-417 '

g Telecopy: Regi~on III, Attention: Mr; C. Feierabend-I >

i December 16, 1974 i

J .. Keppler, Regional Director-f Directorate of ' Regulatory- Operations

[

g Re gion:. III

U'. S.. Atomic

Energy Commi'asion-799 Roosevelt Road I Glen *.Ellyn, 1111noi's 60137'

Reference:

Quad-Cities Huolear- Power: Station, .Uhit 1 i 0 Docket No. 50-25% DPR-29

( Appendix A . Sections.1.0. A.2,. 3 3.B. 3.b . ,s 6 . 6. B:..l . a t

1

Dear-MP..Keppler:

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!s.

i The purpose. of thib- letter is. to provide you with . notification.

! of an Abnor.tal Occurrence at. required- by. Technical Specification._

l 6.6.D.1.a. withint 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of' the occurteence.

}

[ While: pulling rods for startup. of Unit.1 on December-16,.1974~

l the RUM computer failed: andEdidinot. armunciate. This: failure;

[  ! of the 11EM ocEurred during startup; below 10% power- andi allowed' l the cperator* to withdraw. annout-of-sequence rod without a rod l g block or a-larm This move occurred 5. Pods after the RWM failure.

I

[ Ther rod sequence

• error was recogni' zed Er vibual observati'orn of' the rod position display panel. The out-of--sequence rod-was returned to. its in-sequence positidn. and the. RWM' was re-j turned.to operation. This error- was corrected. within; 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />sw  :

) 7 hic occurrence was discussed by- telephone- with_Mr. Knopp of' i your office on. December 1

163 . 1974.. Further information~ will be i l provided by Abnormal Occurrence Report AO: 50-254/74-39; which. Will be submitted' within 10 days. of the date of this. occurrence.

j .Vbry truly yours, COMMONWEALTH EDISOM COMPAlW [,,

QUAD . CITIES ~. N CLEAR POWER STATION 1 .

E H.

f k -

J.. Kalivianakis - --- "-

k'c - Statierr Superintandent r4 ,

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NJK/BBP/1k g

4 cc: Directorate: of Li' censing

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J. S. Abel j if ,, - s u tv t- 00-