ML20084L659

AO 50-237/1974-37:on 740801,during HPCI Testing,Valve 2-2301-35 Failed to Open.Caused by out-of-adjustment Breaker Contractors.Contractors Adjusted.Breaker Operated Satisfactorily

ML20084L659
Person / Time
Site:	Dresden
Issue date:	08/09/1974
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084L663	List: ML20084L659 ML20084L665 ML20084L668
References
573-74, NUDOCS 8305230600
Download: ML20084L659 (2)

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M,. Ac':ress ficply to: PoiTOTce' Box 7ts Chicago, !!hnois C0693 BBS Ltr.d573-74 Dresden Nuclear Power Station R. R. #1 4 Morris, Illinois 60450 .

August 9, 1974 o

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Mr. Ja:nes G. Keppler,- Regional Director 7 WI s '.! jgi.

Directorate of Regulatory Operations-Region III \

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U. S. Atomic Energy Cc:=rission , /0 799 Roosevcit Road {

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SUlMECT: PfPORT OF AEN0'U'AL 0CCffRRENCE PER SECTION 6.6.R OF 'INE TEO.!NICAL SPECIFICATIONS.

JIPCI VALVE 2-2301-35 UOULD N0_T OPEN.

Referencesi 1) Ete,ul s tory Guide 1.16 Rev.1 Appendix A

2) Notificaiion of Region III of AEC Regulatory Operations Telephone: !!r F. I' aura,1545 hours0.0179 days <br />0.429 hours <br />0.00255 weeks <br />5.878725e-4 months <br /> on 8/2/74.

Telegram: !!r. J. Kcppler, 1620 hours0.0188 days <br />0.45 hours <br />0.00268 weeks <br />6.1641e-4 months <br /> on 8/2/74.

3) Drawing Na:cber: P&ID M-51 neport remocr: 20-b//N-3/

Report Date: August 9, 1974 Occurrence Date: August 1,.1974 Facility: Dresden Nucicar Power Station, Morris, Illinois -

IDEITTIFICATION 07 OCC11RRENCE On August 1,1974. HPCI valve 2-2301-35 would not open. The breaker was not tripped.

_ CONDITIONS PRIOR TO OCCURRENCE On August 1, 1974, Unit 2 was in start-up with a power icvel of approxtrately 5001Mt.

i DESCRIPTION OF OCCURRENCE On Aup,ust 1,1974 ITCI testing van in progress. It was found that valva 2-2391-35~' m i' '.7.t cren. The cyctea w.c beic3 tested bec.use Cre:c d hen a mie wo emap en & yrtc: . j

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r Mr. J:mes C. Kappler August 9, 1974 lh )

DE'STCt!ATION OF APPARE!TT CAUSE OF FAIT.URE -

Component Failure Upon checking the breaker, it was found that the contactors were out of adjustment.

ANALYSIS OF OCCURRENCE There were no safety consequences to the public or plant personnel as a result of this occurrence becausa llPCI was never needed. Also, the backup system, auto blowdown, was always operable.

CORPICTIVE ACTION The contactors on the breaker were adjusted and the breaker cperated saticfactorily.

. There in a program to check these breakers on a periodic basia, but this breaker had not been inspected yet.

FAILURE DATA Tlila type vi ineoiet h.su iu d s lu il u failures in t.iie past. 'Ahnt is why the periodic inspaction progran was initiated. This inspection pro, gram should help to olhainate this type of failure.

EQUIPMENT IDE!TTIFICATION Cutler hammer 250V=DC breaker Sincerely,

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-[63IB.Stephenson Superintendent BBS:LJD:do 6

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