05000237/LER-1981-049-01, /01T-0:on 810814,valves 2-203-1A & 2-203-1D Had Closure Time Limits of 2.1-s & 1.7-s,respectively.Caused by Misadjusted Timing Mechanisms on Valves.Valves Adjusted

/01T-0:on 810814,valves 2-203-1A & 2-203-1D Had Closure Time Limits of 2.1-s & 1.7-s,respectively.Caused by Misadjusted Timing Mechanisms on Valves.Valves Adjusted

ML20010E123
Person / Time
Site:	Dresden
Issue date:	08/24/1981
From:	Speroff R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010E120	List: 05000237/LER-1981-049, Forwards LER 81-049/01T-0.Detailed Event Analysis Encl 05000237/LER-1981-049-01, /01T-0:on 810814,valves 2-203-1A & 2-203-1D Had Closure Time Limits of 2.1-s & 1.7-s,respectively.Caused by Misadjusted Timing Mechanisms on Valves.Valves Adjusted
References
LER-81-049-01T, LER-81-49-1T, NUDOCS 8109030120
Download: ML20010E123 (2)

LER-1981-049, /01T-0:on 810814,valves 2-203-1A & 2-203-1D Had Closure Time Limits of 2.1-s & 1.7-s,respectively.Caused by Misadjusted Timing Mechanisms on Valves.Valves Adjusted

Event date:
Report date:
2371981049R01 - NRC Website

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NRC FORM M4

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LICENSEE EVENT REPORT 1

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' I o i 2 I l Durine an order 1v unit <hutdown while nerforMnc the quarterly timing surveillance of l

f l a 13 l l the main steam isolation valves, valves 2-203-1A and 2-203-lD had closure time limits l j l o 14 l lof 2.1 and 1.7 seconds respectively. Tech. Spec. Table 3.7.1 requires closure time l

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tijii l plant operation. MSIVs 2-203-1A and 2-203-lD were adjusted and timed at 3.4 and 3.7 I

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ATTACHMENT TO LICENSEE EVENT REPORT 81-49/0lT-0 COM'!Oh"JEALTH EDISON COMPANY (CWE)

DRESDEN UNIT ILDRS-2 DOCKET #050-237 During a normal shutdown of Dresden Station Unit 2 Reactor, the quarterly timing surveillance of the main steam isolation valves was performed. The surveillance testing revealed that MSIVs 2-203-1A and 2-203-1D had closure times of 2.1 and 1.7 seconds, respectively.

Technical Specification Table 3.7.1 requires closure time limits of between 3 and 5 seconds. Minimal effect upon public health and safety because remaining MSIV closure times were within Tech. Spec. limits and all valves were operable.

There have been similar occurrences at Dresden with last being R. O. #81-ll/03L-0.

I The timing mechanisms on MSIVs 2-203-1A and 2-203-lD became misadjusted during normal plant operation. The MSIVs were adjusted and retimed resulting in times of 3.4 seconds for 2-203-1A and 3.7 seconds for 2-203-lD.

The quarterly timing surveillance of the main steam isolation valves will continue i

to be performed to ensure proper closure times are maintained.

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