ML20027A562

LER#78-063/03L-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

ML20027A562
Person / Time
Site:	Dresden
Issue date:	12/19/1978
From:	Achterberg J COMMONWEALTH EDISON CO.
To:
Shared Package
ML17173A443	List: ML17173A442 ML20027A562
References
LER-78-063-03L, LER-78-63-3L, NUDOCS 7812270271
Download: ML20027A562 (2)

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a J O COCKET NL*/dm M CJ EMNT GATE 74 M PE*0.U QATE 43 EvEr.T ::Esca: PT:ON AND PRCSASLE CONSECUENCES h i o i i l During normal surveillance testing of MSIV closure time, MSIV 2-203-1A closed in i 90 ,3; l5.6 seconds and MSIV 2-203-1C closed in 2.8 seconds after the initiation signal, which;

g , .; j did not meet T.S. Table 3.7.D.2 limits of 3 </= T </=5 sec. Event was of minimal l 1,e3l l safety significance because other MSIV closure times were within T.S. limits and l .

ij a;tvalves did close. This event has occurred several times before at Dresden, most I

( .: i: l l recently referenced under R.O. #50-249/78-!4 l

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]i historical closing times for MSIV's indicates that minimal time variations occur I

! i; j infrequently because of wear and heat of drvwell environment. Valves will be in- I  ;

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