ML19261F189

LER 78-019/03L-0:on 780605,while Performing Procedure Sp 1303-5,control Fuse Opened & Valve RB-V-7 Did Not Operate.Caused by Failure of Voltage Spike Suppressor Across Coil of Auxiliary Relay,Causing Short Circuit

ML19261F189
Person / Time
Site:	Three Mile Island
Issue date:	06/22/1978
From:	METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19261F187	List: ML19261F186 ML19261F189
References
LER-78-019-03L, LER-78-19-3L, NUDOCS 7910250609
Download: ML19261F189 (1)

Text

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EVENT REPORT -

CO t:T C. 3 L OC K: l l l l l l l (PLE ASE PRINT OR TYPE ALL REDVIRED INFORMATIONI I t

]lPlA[TlMj!l1 @]Ol0l-l0l0 0 0 l0 - l0 l 0 l@lh 1 l1 l1 l1 l@l l l@

14 !b LICENSE NWSEM 23 2E LICENSE TYPE JJ 57 GAT 56 E 9 Lit NSEE CODE T

{8 3 gay lLlgl0l5l0l0l0l2l6l9l@l0l6l0 5[7l8l@l0l6l2l2l7lSj@

a 60 61 68 69 EV ENT D ATE 74 75 REPCRT CATE 80 OCCKET NUVBER EVENT DESCRIPTION A NO PRCB ABLE CONSECUENCES h D lWhile performing S? 1303-3.1 "Eeactor Building Coolan', and Isolaticn System Icgic j The j g l Channel & Cc=penent Test", the control fuse opened and F3-V-7 did not operate.

g Peactcr Eldg. Cooling System is a closed syste= inside the Eeactor 31dg. thus no 1 g l threat to the health and safety of the puolic existed for the short period of time [

.:is eve t is reportable.per T.S. 6.9 2.3.(2) and i s] l the valve was out of service.

g l represents a degraded mode under T.S. 3.6.6. LER 77-14 reported a similar event. [

I OI8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE COCE CODE SUBCODE COMPONENT CCDE SUSCODE SUSCCDE

{ 9 A A [g {@ l Alg lE lE l L l A j Y 10 11 12 13 X

18

@ l Xl@ { g 19 20 8

SE QUE NTI A L OCCURAENCE REPORT R EV f SiON EVENT YE AR REPORT NO. CODE TYPE N O.

LE A RO

@ ,aga; IvIal 1-1 nI, o d in I,j Lg_j I-1 La_]

32

_.21 22 23 24 26 47 23 29 JO 31 ACTION . FUTURE EFFECT SHuTcOwN ATT ACHV ENT NPRO 4 PP'ME COYP. COYPONENT TAKEN ACTION ON PLANT METHCD HOURS 22 SUBMITTED FORMbuB. SUPPLIER MANUFACTURER lA 33 l@l34Zl@ [1)@

35 l Z lh 36 l,0 l 0 l 0 3<

0 40 l41?T @ l !I lh I X h 4; 43 44 X l9 Io o'h 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h B I"'he valve failed due to a blev - fusa i- + % ner+ rn' r4 r, u d + . a va' + qa 4 '.r a l

] Isur ressien (thv ectcr). acrcss the m47 oc- a v4'4o-v -a7e r hoA #e 4 7 aA -o + g I I

] la short circuit. The thvrector was rerlaced and the valve fu-etic-ed as desi --ad .

B 13e valve was retun.ed to full crerability within 2h heu s. l I

5e 9

• 80 F ACILITY , METHOO CF DISCOVERY OESCRiPitCN .a STATUS  % POWER OTHER STATUS

• DISCOVE RY C Wh l0 lo l8 lhl Ti/A 8 'l 10 12 11 44 l3lhl Surveillance 45 46 80 l

A C Tiv t TY CCNTENT mELEASE3 CF RE LE ASE AMOUNT CF ACTIVITY LOCATION OF RELE ASE tr /A I I tt / A I D8 12 9 l @ L11@l 10 11 44 45 80 PERSCNNEL EXPOSURES '

NUv9E R Tv P ". O E SC RIPTION * 'n0I 1

! O l 0 lhdhl ?I/A rh lli hGh l {Qt! !i'L U!!!! 9'.i!ld l 80 PERSCNNE L N tu iES NuvSER CESCR;PTION D8 i- 1010 l@l ruA 3 11 '2 L As CF OR Da.v AGE TO FACILITY = l *

• vPE CE SCRIPTICN B: I@I 8 9 10 80 i

PUB L ICITY 45 NRC USE ONLY r:S;.,E D DE SC RIPTION l Weekly ?IeVS 3elease l llllllllll ll l , .

7910250[O7