ML20003B130

LER 81-003/03L-0:on 810106,during Test,One Channel of 1D Helium Circulator Drain Malfunction Found Inoperable.Caused by Blown Switch Module Fuse.Fuse Replaced & Switch Returned to Svc

ML20003B130
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/03/1981
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20003B122	List: ML20003B121 ML20003B130
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8102100391
Download: ML20003B130 (1)

Text

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NRC FOQM 0,66 U. S. NUCLEAR REGULATORY COMMISSION f7 771 LICENSEE EVENT REPORT CcNTRot eLcCK: l l l l l 1 l@ (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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COCx ET Nyvgga na tG EVENT 0 ATE 14 'S REPORT O ATE dJ 7 4 60 61 EVENT DESCRIPTION AND PRC8ABLE CONSEQUENCES h lo!;jl During test, it was f ound that one channel of 1D helium circulator drain nalfunction l

[oj n l was inoperable. This event constitutes operation in a degraded mode of ICO 4.4.1, l l o 1.1 i Table 4.4-3 and is reportable per Fort St. Vrain Technical soecification AC 7.5.2(b)2.1 10isl i No effect uoon public health or safety. No accocoanving occurrence. Redundant chan-l lo is l l nels were available and operable. No similar reoorts. I l a i 71 I I I

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J 34 39 ad 3 40 el 42 e 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l3 i o ; l The cause of the channel inoperability was a blown fuse in switch module, Model SW-2D.l g ;No cause for the fuse blowing could be found. The fuse was replaced and the channel 1 returned to service. The fuse is a 0.5 amp miniature and has operated with no prob- ;

, j3j ] lems since replacement. Public Service Company Nuclear Proj ects Department requested; g, , , g to evaluate circuit design to determine if blown fuse indication is feasible.  ;

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NAME OF PREPARER '

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