ML20040G737

LER 82-002/03L-0:on 820107,core Spray Pump 11 Start Time Delay Relay Failed to Operate.Caused by Loose Terminal Connection & Microswitch Contact Burned Open.New GE CR 2820 Relay Installed

ML20040G737
Person / Time
Site:	Monticello
Issue date:	02/06/1982
From:	Carpenter G NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20040G731	List: ML20040G730 ML20040G737
References
LER-82-002-03L, LER-82-2-3L, NUDOCS 8202160418
Download: ML20040G737 (1)

Text

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Hs C 51982 NRC FORMMg

. (7 77) U. L. NUCLEAR REGUL ATORY COMMISSION 9

LICENSEE EVENT REPORT / .

l -lh CONTROL OLOCK: l l l l l (PL' EASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 l0 l 18 9l l MlN 7 lM lN LICENSEE CODEl P l 1 l@l I4 lb 0 l 0 l -l 0l 0l 0l Li;ENsE 0l 0l - l 0 l 025l@l26 4 l LICENSE NuMsEM 1l 1l 1l 1 l@lb e L'lA n bel g -

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7 8 OOCKET NUMBE h 68 69 74 LVENT DATE 7S REPORT DAT E 83 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES to lol2l l During cold shutdown testing, the #11 Core Spray Pump start time delay relay failed io13Jl to operate. Time delay relay failure would have resulted in failure of #11 Core l 10141 1 Spray Pump to automatically sequence on during loss of power event. Pump could j ,

I IOIsl I have been manually started by operator. The #12 Core Spray Pump start time delay l .

I O 16 I l reiny uns opernble. No nrevious similar event. No effect on public health or i 10171 L;dety. l l 0 la I l l 7 8 a 80 DE CODE SUBC E COMPONENT CODE SUBCOdE 5 E l0l91 7 8 l S l F l@ l El@ W@ l IJRl El Ll Al Yl X l@ W@ l 20Zl @

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_ SE QUE NTI AL OCCURRENCE REPORT REVislON EVENTYEAR REPORT NO.

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,CAUSE DESCRIPTION AND CORRECTIVE ACTIONS j i ; o ; l G.E. CR 2820 time delay relay failed. Two events caused failure. Loose terminal ,

[i li l l connection caused relay not to pick up signal; microswitch contact on relay was  ;

iii7i l burned open. New CR 2820 relay was installed and tested with satisfactory resultsq I i 13] [ Similar relays tested and demonstrated to operate properly. All CR 2820 relays in; tiI4i ; Emergency Core Cooling System to be replaced with Agastat relays. l

's t'A' S'  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION I1 15 l (Gjh l0 l 0l 0l@l NA l l C l@l Special Test l

1. ' ' I U AC Tivt TY CO$ TENT 80 RELE ASED OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELE ASE l1' l6" l"{ Z,j h l1.j@l NA l l NA l

PERsov2t ExeOsV5Es NUVDfM TYPE DESCRIPTION l i j 7 l l 0 l 0 l 0 l@[Zj@l NA l

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NAME OF PREPARER - C. L. Carpenter PHONE-(612) 295-5151 o