ML17174A117

LER 79-027/03L-0:on 791003,half of Trip Sys Inoperable Due to Lifting of Flooding Magnetrol Switch Leads to Condenser Pit.Switch Leads Reattached.No Precise Cause Found

ML17174A117
Person / Time
Site:	Dresden
Issue date:	10/30/1979
From:	Korchynsky M COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17174A118	List: ML17174A117 ML19256E506
References
LER-79-027-03L-03, LER-79-27-3L-3, NUDOCS 7911070547
Download: ML17174A117 (2)

Text

..,1 Commonw9h Edison \ DSB Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 f.

October 29, 1979 BBS LTR: 79-868 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear R~gulatory Commission 799\ Roosevelt Road Glen Ellyn, Illinois 60137 Reportable Occurrence Report #79-27/03L-0, Docket #050,249, is hereby submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2. (b), conditions l,eading to operation in a degraded mode permitted by-a limiting condition for

• operation or plant* sh1:1tdown required by a limiting condition for

• operation.

~te ens on Station Superintendent Dresden Nuclear Power Station BBS:mt Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 7c; 110 7o~4-7

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• Ll°CENSEE EVENT REPORT

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• 61 . DOCKET NUMBER 68 . 69 EVENT DATE 74 75 REPORT DATE 80 t§IIJ. I EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

During normal operation while searching for 50 vdc ground, leads to condenser pit. --

J]lTI I flooding magnetrol *switches 3-4441-25A and 25B were lifted making half of_ trip. systeIIJ f o 14 I I inop. for 7 hrs. Safety significance minimized by stationing man with radio at I*

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~ I condenser pit. First occurrence of this event.

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\!:.) REPORT NUMBER I7 I9 I I I Io 12 I1 I 1/1 10 J3 I L!J I I LQJ 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN r:;:::.. ATTACHMENT NPRD-4 PRIME C.OMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM :>UB. SUPPLIER MANUFACTURER W@~

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44 47 CAUS.E DESCRIPTION AND CORRECTIVE ACTIONS.@

[J]I] .I After reattaching leads to level switches the ground cleared. No precise cause was I 'I ITIIJ found. *There may have been minimal corrosion on switch terminals which was removed ITJil .1 to clear ground when leads were reattached *. DIS 4400""."l was .performed and switches rrm I operated satisfactorily. No further action now. planned

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. PERSONNEL INJURIES ~

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• L.OSS OF OR DAMAGE TO FACILITY '4J\

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. NRC USE ONLY ..

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