05000272/LER-1982-059-03, /03L-0:on 820809,source Range Neutron Flux Channel 1N31 Indication Failed Low.Channel Declared Inoperable Since Reactor Trip Breakers Open.Caused by Failure of High Voltage Power Supply.Power Supply Replaced

/03L-0:on 820809,source Range Neutron Flux Channel 1N31 Indication Failed Low.Channel Declared Inoperable Since Reactor Trip Breakers Open.Caused by Failure of High Voltage Power Supply.Power Supply Replaced

ML20027B178
Person / Time
Site:	Salem
Issue date:	08/25/1982
From:	Frahm R Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027B164	List: 05000272/LER-1982-059, Forwards LER 82-059/03L-0.Detailed Event Analysis Encl 05000272/LER-1982-059-03, /03L-0:on 820809,source Range Neutron Flux Channel 1N31 Indication Failed Low.Channel Declared Inoperable Since Reactor Trip Breakers Open.Caused by Failure of High Voltage Power Supply.Power Supply Replaced
References
LER-82-059-03L-01, LER-82-59-3L-1, NUDOCS 8209160506
Download: ML20027B178 (1)

LER-1982-059, /03L-0:on 820809,source Range Neutron Flux Channel 1N31 Indication Failed Low.Channel Declared Inoperable Since Reactor Trip Breakers Open.Caused by Failure of High Voltage Power Supply.Power Supply Replaced

Event date:
Report date:
2721982059R03 - NRC Website

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N3C FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

• LICENSEE EVENT REPORT

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CONTROL BLOCK: l l

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8 60 si cOCKET NUMBER 68 69 EVENT oATE 74 75 REPORT QATE 80 EVENT DESCRIPTION AND PRO 8 A8LE CONSEQUENCES h Io l2l lOn August 9, 1982, during routine operation, the Control Operator discovered that

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g o ; 3, l Source Range Neutron Flux Channel IN31 indication had failed low.

The channel was l 1 o l a l'l declared inoperable; since the reactor trip breakers were open, however, operabilitii loIsIiwas not required by the Technical Specifications. The breakers were subsequently l

l 016 l l closed, and Limiting Condition for Operation 3.3.1.1 Action 4a was entered.

The l O 17 l l occurrence constituted operation in a degraded mode in accordance with Technical I

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I o i s I I Specification 6.9.1.9.b.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l l The source range channel failed due to the failure of the high voltage power supply.l lThe power supply was replaced, and the new supply adjusted to the required voltage. I i i i,,2i l Channel 1N31 was declared operable and the limiting condition for operation l

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