ML17252B188

LER 80-030/03L-0 for Dresden Unit 3 Regarding While Reducing Power for Manual Scram Required by I.E.Bulletin 80-17, Routine Surveillance of MSIV Closure Times Showed That MSIVs 3-203-2B and 2D Closed in Less than 3 Seconds

ML17252B188
Person / Time
Site:	Dresden
Issue date:	08/04/1980
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR #80-645 LER 80-030/03L-0
Download: ML17252B188 (2)

Text

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Edison '

Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 .

Telephone 815/942-2920 August 4, 198.b BBS LTR {/80-645 James G. Keppler, Regional Director Directorate of Regulat~ry Operations - Region III U.S. Nuclear Regulatory* Commission 799 Roosevel~ Road Glen Ellyn, IL 60137 Reportable Occurrence Report #80~30/03L-0, Docket #050~249 is

• being 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.

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B. B. ~~ei[~:son Station Superintendent Dresden Nuclear Power Station BBS:crf Enclosure cc: Director of Inspection* & Enforcement Director of Maµagement Information & Program Control U.S. NRC Document Management Branch File/NRC *Aoo'a.

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((IIJ I While reducing power for the manual scram required by I.E.Bulletin 80-17, routine surveillance of MSIV closure times showed that .MSIVs 3-203-2B and 2D closed in less

[QJI] than 3 SP.conds, exceed.i.ng T.S. Table -3. 7 .. 1 limits of 3</'=T,<1=5, secs. Safety sig*

CIT§] I nificanc:e minimized because* the inboard MSIV closure times were within limits.

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OJ:[] I MSIV 3-203-2B timing mechanism became misadjusted from normal plant operation. Timing OJI] r*mechanism was loose on MSIV 3-203-2D. MSIV 3-203-2B was adjusted and timed at 3. 2 secs. MSIV 3-203-2D was tightened, adjusted and timed at 3 secs. The quarterly timing surveillance will continue to be performed to ensure proper closure times OJ)) 'L-~~~~~~~~~~~~----~~~~~~-=-~~~~~~---'-~~~~~~---'

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