05000237/LER-1978-053, Forwards LER 78-053/03L-0

Forwards LER 78-053/03L-0

ML17173A314
Person / Time
Site:	Dresden
Issue date:	10/17/1978
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A315	List: 05000237/LER-1978-053, Forwards LER 78-053/03L-0 05000237/LER-1978-053-03, /03L-0 on 780926:Equip Attendent Noted Main Steam Line Flow Switch 261-2D Was Valved Out Due to Unknown Cause. Event Had Minimal Safety Significance & Switch Returned to Svc.Surveillance Sheets Wo Require Daily Check of Swit
References
BBS-78-1386, NUDOCS 7810270234
Download: ML17173A314 (2)

LER-1978-053, Forwards LER 78-053/03L-0

Event date:
Report date:
2371978053R00 - NRC Website

text

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i Commdnweilib Edison Dresden ~uclea9wer Stati~n R.R. #1 l

Morris, Illinois 60450 Telephone 815/942-2920

~BS Ltr. #78-1386 James G. Keppler, Regional Director October 17, 1978 Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report //78-053/03L-0, Docket 11050-237 is hereby submitted to your office in accordance.with Dresden Nuclear Power Station Technical Specification 6.6.B~2.(c), observed inadequacies in the implementation of administrative or procedural controls which threaten to. cause reduction of degree of.redundancy provid.ed in. reactor protection systems.or engineered safety feature systems, e,

n Sup rintendent Dresden Nuclear Power Station BBS/deb Enclosure cc:

Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC

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.::~;.::*:*:~".'.'E~T DESCRIPTION AND PROBABLE CONSEQUENCES@

C2J1J I* Dilring steady state operation an Equipment Attendent noted Main Steam Line (A) Flow

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(:2:JTI I s¥itch 261-:2D (1 of 16) was. valved out.

Event had minimal safety significance since I o\\*~*I *,. ~~l other flow switches were operable as required by Tech. Specs.

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I dause for switch isolation unknown.

Switch returned to service.

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Switch *operation* also not recorded as required by Equipment Attendant.

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[TIIJ I *~ Control. room surveillance sheets will be revise.cl to include.::i. cfai.1.v ~heck* of these I.

LifilJ switcP,es and requj.rea supervisory review.

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