ML20010E123

LER 81-049/01T-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

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: ML20010E119 ML20010E123
References
LER-81-049-01T, LER-81-49-1T, NUDOCS 8109030120
Download: ML20010E123 (2)

Text

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NRC FORM M4 - - - - - - - - - -- -

_ U.S.MUCLEAR HEGULATURY COMMISSION j LICENSEE EVENT REPORT 1

CONTROL BLOCK: l 1

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(Pt. EASE PRINT OR TYPE ALL REQUIRED INFORMATION) 10 l1d 9l l I l LICENSEE 7

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d 60 61 OoCKET NUM8ER 68 69 EVENT DATE 74 75 RE*CRT QATE 80 EVENT DESCRIPTION AND PROBABLE CCNSEQUENCES h

' 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 loj3l l limits of between 3 and 5 seconds. Minimal effect upon public health and safety be- g I o !s I i cause remaining MSIV closure times were within Tech. Spec. limits and all valves were  ;

lo17l l operable. There have been similar occurrences, the last being reported by #81-11/03L-0.;

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7 8 9 80

. SYSTEM CAUSE CAUSE COMP. VA LVE i

CODE COCE SUSCODE CCMPCNENTCODE SUSCOCE SUSCOCE io t al' I c l D i@ lE l@ lB l@ lV l A lL lV lE lX [h l F lg lD [@

7 8 9 10 11 12 13 18 19 20

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40 43 CAUSE DESCRIPTION AND CCRRECTIVE ACTICNS l i ( o l l The timing mechanisms on MSIVs 2-203-1A and 2-203-1D became misadjusted during normal l tijii l plant operation. MSIVs 2-203-1A and 2-203-lD were adjusted and timed at 3.4 and 3.7 I

,,i7l l seconds, respectively. The quarterly timing surveillance will continue to be performed [

j i1 ;3l l to ensure proper closure times are maintained. l I (1 t4Il l

!7 8 3 So

'STAN  % PCWER OTHER STATUS DIS RY DISCCVERY DESCRIPTICN f l1 i s l lD l@ l 0 l 4 l 6 l@l N/A l lB[gl Operator observation l ACTIVITY CC TENT 2ELEASED OF AELEASE AMCUNT OF ACTIVITY LOCATION OF RELEASE N/A l l N/A l j lt 168 l3IZ l h l toZ l@l 7 17 44 45 30 -

PERSCNNEL ExPCSURES NUVSEA TYPE O ESCRIPTICN N/A li l 711010 l0 l@l' Zi@l 30 l

PERSCNN E L INJU AIES i NU 9ER OESCRIPTICN N/A 11 la l 10 l 10 l@l12 l 7 3 3 11 80 LOSS CF CA DAMAGE To FACILITY WPE OESCRIPTioN N/A l_

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8109030120 810924 Randy D. Speroff 815-942-2920 o l PDR ADOCK 05000237  ?"oN G. h g PDR'

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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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