05000237/LER-1978-063, Forwards LER 78-063/03L-0

Forwards LER 78-063/03L-0

ML17173A442
Person / Time
Site:	Dresden
Issue date:	12/19/1978
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A443	List: 05000237/LER-1978-063, Forwards LER 78-063/03L-0 05000237/LER-1978-063-03, /03L-0 on 781123:MSIV 2-203-1A Closed in 5.6 Seconds & MSIV 2-203-1C in 2 Seconds After Initiation Signal,Caused by MSIV 2-203-1A & MSIV 2-203-1C Valve Timing Out of Adjustment
References
NUDOCS 7812270261
Download: ML17173A442 (2)

LER-1978-063, Forwards LER 78-063/03L-0

Event date:
Report date:
2371978063R00 - NRC Website

text

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Commonv9th Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 REGULATORY DOCl\\ET FILE COPY December 19, 1978 BBS Ltr. #78-1582 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report /,178-063/03L-0, Docket f/050._237 is hereby submitted to your office in. accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

Dresden BBS/deb Enclosure cc:

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

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(P.LEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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.DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

!During normal surveillance testing of MSIV closure time; MSIV 2-203-lA closed in C2::IIJ I 5.6 seconds and MSIV 2-203-lC closed in 2.8 seconds after the initiation signal, which I

[§]~]I did not meet T.S. Table 3. 7.D.2 limits of 3 </c T </=5 sec. Event was of minimal ITIIJ 1safety significance because other MSIV closure times were within T.S. limits and

[]JI] 1valves did close.

This event has occurred several times before at Dresden, most

((DJ I recently referenced under R.. O :. ti 50-249 I 7 8-54.

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.. w 43 MSIV 2-203~1A and 2-203-lC valve timing was out of ~~d~j~u~s~t~m~e~.n~t~*~~A~f~t=e~r_m.:.:=inor adjust-ment to speed control ~alves, MSIV 2-203-lA closed pr6perly in 4.2 sec.

Reyiew of historical closing times for MSIV's indicates that minimal time variations occur D:IIJ / infrequently because of wear and heat* of drywell environment.

Valves will be in-r;-r:4l I spected during next refueling outage per DMP 233,

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