ML19309F460

LER 80-003/01T-0:on 800408,while Testing Pressurizer Logic Channels,Pressurizer Level Channel 427 Was Momentarily Failed Low by Instrumentation & Control Technicians.Caused by Personnel Error.Event Discussed W/Personnel

ML19309F460
Person / Time
Site:	Point Beach
Issue date:	04/17/1980
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19309F446	List: ML19309F445 ML19309F460
References
LER-80-003-01T, LER-80-3-1T, NUDOCS 8004290479
Download: ML19309F460 (2)

Text

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ately recognized and corrected. Plant parameters were evaluated and g g ,, , found to be normal. Redundant pressurizer level channels available were, capable of performing their safety functions. The minimum degree of ,

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ATTACHMENT TO LICENSEE EVENT REPORT 80-003/01T-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 2 Docket No. 50-301 Unit 2 was operating at 88% power (455 MWe) wi th I &C testing in the pressurizer white logic channel. The technician was reading the test procedure for pressurizer pressure Channel 4 30. The repairman (trainee) inadvertently opened the test jack for pressurizer level Channel 427. The technician, immediately recognizing the error, placed Channel 427 back into operation and informed shif t personnel.

Opening the test jack for Channel 427 caused a zero current signal which simulates a low pressurizer level. The pressurizer haaters deenergized and letdown isolation valve LCV-427 closed. When the channel was restored, all systems were returned to normal by the unit operator. Plant operating parameters were all verified to be within normal operating limi ts .

Limiting conditions of operation were not maintained.

Technical Specification 15. 3.5-2 requires a minimum degree of redundancy of one for pressurizer hi water level. During the momentary interruption of Channel 427, redundancy was reduced to zero.

1 While Channel 427 was failed low, it would not have sensed a hi pressurizer level. Redundant level Channels 426 and 4 28 were operable and would have operated properly, initiating designated safety functions, thereby protecting the public health and safety.

No past similar events have been identified.

The personnel involved with the event along with other I & C personnel were reminded to perform all testing with care and assure themselves of proper implementation of the procedure being performed.

.