ML17252B190

LER 80-023/03L-0 for Dresden Unit 3 Regarding During Normal Operation with Reactor Level Instrument Surveillance in Progress, Level Switch LIS 3-263-58A Tripped at Less than Tech. Spec. Limit of 144 Inches

ML17252B190
Person / Time
Site:	Dresden
Issue date:	06/13/1980
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR. #80-508 LER 80-023/03L-0
Download: ML17252B190 (2)

Text

Commonwe. Edison Dresden Nuclear Power Station R.R. #1

• ~ WN *1 8 19BO Morris, Illinois 60450 Telephone 815/942-2920 June 13, 1,980

".. '!BBS LTR,. /180-508 James G. Kepp],er, Regional Di.rect;oi; Directorate of* Regulatory :. Operatt.ons - R,eg:;i.on I.U:

U.S. Nuclear Regulatory Commissi01;1 799 Roos*evelt Road Glen Ellyn, IL 6'0137 Reportabl,e Occurrence R,e.po:rt ii* 8Q.,:.23/03L-0 ,Dock.et I! 050-249 , is being submitted to your office i:n. acGord;:tn.ce w:tt;h D.resden N:uclear Power Station Technical Specificat;ion *6~6.B.2. (a), react.or protect;ion system or engineered safety feature instrument settings* whi.ch. aTe found to be less conservative than those established by the technica.l specifications but which do not pre-vent the fulfillment of the func!'ional requi.rement;s 0f affected systems.

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l3 ,B .. Ste.pheAso:n St;;at.t.on Superintendent

• Dresden Nuclear Power Station BBS:

Enclosure.

cc: Director of. In.spei::.t:;i.on.. & En.f<?rGemen.t Di.rector of Management. I:n.fonnat:;i.~on & Progi;~ Control File/N*RC Aoo~

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• 69 EVENT DATE 74. 75 REPORT DA TC:

10 80 I© EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES {iQ) . . .

I During nomal operation with reactor ~vel instrument surveillance in progress, level

[]JI)' I switch LIS 3-263-58A tripped at less than the Tech. Spec. limit (Table. 3.2.1) of 144 CQ:ill inches. The safety significance of this event was minimal since channel "B" and the C2:IrJ I redundant channel "A"* ins-truments were operable. There was no effect on public health

[)))) or safety. Previous occurrences: R. 0. 76-5 7 /031-0, Do.cket 50-237 and 77-51/031-0, I

((ill' Docket 50-249.

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CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS {27)

I The cause of this event* was a mis~igned Yarway switch assembly, model number 4418C, serial number 44180. The switch was adjusted and satisfactorily tested. DIS 500-2 will continue to be* performed monthly.

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