05000255/LER-1979-008-03, /03L-0 on 790126: Tank Vent Valve (CV-3051) Opened Simultaneously w/N2 Fill Valve;Tank Pressure Dropped Below Tech Specs Limit. Caused by Electrical Short Between Wires for Fill & Vent Valves

/03L-0 on 790126: Tank Vent Valve (CV-3051) Opened Simultaneously w/N2 Fill Valve;Tank Pressure Dropped Below Tech Specs Limit. Caused by Electrical Short Between Wires for Fill & Vent Valves

ML18043A496
Person / Time
Site:	Palisades
Issue date:	02/21/1979
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML18043A495	List: 05000255/LER-1979-008, Forwards LER 79-008/03L-0 05000255/LER-1979-008-03, /03L-0 on 790126: Tank Vent Valve (CV-3051) Opened Simultaneously w/N2 Fill Valve;Tank Pressure Dropped Below Tech Specs Limit. Caused by Electrical Short Between Wires for Fill & Vent Valves
References
LER-79-008-03L, LER-79-8-3L, NUDOCS 7902260467
Download: ML18043A496 (2)

LER-1979-008, /03L-0 on 790126: Tank Vent Valve (CV-3051) Opened Simultaneously w/N2 Fill Valve;Tank Pressure Dropped Below Tech Specs Limit. Caused by Electrical Short Between Wires for Fill & Vent Valves

Event date:
Report date:
2551979008R03 - NRC Website

text

Palisades NRC FORM366 17:111 U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: I I G)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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I MII Ip I AIL 111010 I 010 I 0 I 010 I 010 I 0 1° I 0 1014 11 11 11 1 1 101 I 10 7

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LICENSEE CODE 14

~5 LICENSE NUMBER

~5 26 LICENSE TYPE 30 57 CAT 58 CON'T WI]

7 8

~~~~lkJ©IOl5 IOl.01 921 5151G)!O!l!2161719l@!Ol2121ll719JG) 50 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

l]J]J I During an attempt ~o raise the pressure in safety injection tank T-82D,

[]JI} 1 the tank vent valve (CV-3051) opened simultaneously with the N2 fill valve 1

((IIJ causing the tank pres sure to drop be low the limit of TS 3. 3. lb.

The vent

!)))) valve has been disabled to the closed position in* order to perm.it use of the N2 fill valve.

The low pressure condition lasted for 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.

l:IIZJ I No threat to public health or safety existed.

CIT[]

7 8 9 [ill]

SYSTEM

CAUSE

CAUSE CODE CODE SUBCOCE COMPONENT CODE 1s1F1@ L!J@ w 1v1A.111v1E1x1e COMP.

VALVE SUBCODE SUB CODE l!J@) ~@

7 8

9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REPORT NA.

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~ 1°151

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23 24 26 27 28 29 30 LER/RO LVENTYEAR REPORT (7 19 I NUMBER 21 22 L=J 31 ACTION FUTURE EFFECT SHUTDOWN r.;:::-,

ATTACHMENT NPRD-4 PRIME COMP.

SUPPLIER REVISION*

.COMPONENT MANUF-"'CTlJRER 80 TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM ~UB.

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43 44 47 CAUSE DESCRIPTION AND CORREC"rlVE ACTIONS @

I Valve malf'unction appears to have been caused by an electrical short betwe;n [I]J] I the wires for the fill and vent valves for T-82D.

Both valves are on the same electrical scheme, and their wires share a common connector at the IIIIJ '--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~--'

containment electrical penetration.

When plant conditions permit, the o::ID ~'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~--'

ITilJ I fault will be located and corrected.

1 a 9 FACILITY IJQ\\

STATUS

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10 12 13 44 ACTIVITY CONTENT Q.,

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AMOUNT OF ACTIVITY~

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46 80 N/A LOCATIOlll OF RELEASE @

44 45 80 PERSONNEL EXPOSURES

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80 NUMBER DESCRIPTION~

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11 12 LOSS. OF OR DAMAGE TO FACILITY (,jJ\\

TYPE

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I I I I I I I I I I I I I NRC USE ONLY a s 10 68 69 80

consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201

• Area Code 517 788-0550 February 21, 1979

~..r James G Keppler Office of Inspection and Enforcement Region III US*Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - LER 79-008 On the reverse side is Licensee Event Report 79-0o8 which is reportable under Technical Specification 6.9.2.b.(2).

~lJ, p

~-.;;;;;D'avid P Hoff:man tJ

• Assistant Nuclear Licensing Administrator CC:

Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement

~g 2 3 1979

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