05000249/LER-1979-027-03, /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

/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: 05000249/LER-1979-027, Forwards LER 79-027/03L-0 05000249/LER-1979-027-03, /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
References
LER-79-027-03L-03, LER-79-27-3L-3, NUDOCS 7911070547
Download: ML17174A117 (2)

LER-1979-027, /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

Event date:
Report date:
2491979027R03 - NRC Website

text

Commonw9h Edison 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

..,1 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.

BBS:mt Enclosure

~te ens on Station Superintendent Dresden Nuclear Power Station cc:

Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 7c; 110 7o~4-7 DSB

iNRC FO~.

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Ll°CENSEE EVENT REPORT

.,, ; **.,.. CONT~OL BLOCK: !-I _..1.----1. _ _.___l.__""r_._--!.I 0

. *:.(PLEASE PRINT OR TYPE I REQUIRED INF_ORMATIONI 1

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I I I LI DI RI s I 3 l@I o I o I - I o I o I oJ o-1 o I - I a I a 101 4 I 1 I 1 I 1 I l l©I I. I© 9

LICENSEE CODE 14 15 LICEN~~ NUMBER 25 26 LICENSE TYPE JO 57 CAT 58

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DOCKET NUMBER 68.

69 EVENT DATE 91@11 j o I 3 I o I 1 I 9 10

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74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

t§IIJ. I 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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11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REPORT NO:

CODE TYPE I I Io 12 I 1 I 1/1 10 J3 I L!J I I 23 24 26 27 28 29 30 31 ACTION FUTURE EFFECT SHUTDOWN r:;:::..

ATTACHMENT NPRD-4 PRIME C.OMP.

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TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM :>UB.

SUPPLIER W@~ ~@ ~ 10101010' IN-I@

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CAUS.E DESCRIPTION AND CORRECTIVE ACTIONS.@

44 47 [J]I].I After reattaching leads to level switches the ground cleared.

No precise cause was 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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10 11 METHOD OF D_ISCOVERY DESCRIPTION DISCOVERY W@I Operator Observation 44

. 45 46 LOCATION OF RELEASE (§)

N/A 44

. 45 PERSONNEL EXPOSURES

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TYPE

DESCRIPTION

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9 11 12 80 L.OSS OF OR DAMAGE TO FACILITY '4J\\

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