05000336/LER-1980-004-03, /03L-0:on 800204,during Routine Surveillance, Reactor Protection Sys Channel B Trip Signal for RCP Underspeed Found Out of Specs.Caused by frequency-to-voltage Converter Being High & Unstable.Unit Replaced & Calibr

/03L-0:on 800204,during Routine Surveillance, Reactor Protection Sys Channel B Trip Signal for RCP Underspeed Found Out of Specs.Caused by frequency-to-voltage Converter Being High & Unstable.Unit Replaced & Calibr

ML19294C227
Person / Time
Site:	Millstone
Issue date:	03/03/1980
From:	Bates R NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19294C220	List: 05000336/LER-1980-004, Forwards LER 80-004/03L-0 05000336/LER-1980-004-03, /03L-0:on 800204,during Routine Surveillance, Reactor Protection Sys Channel B Trip Signal for RCP Underspeed Found Out of Specs.Caused by frequency-to-voltage Converter Being High & Unstable.Unit Replaced & Calibr
References
LER-80-004-03L-01, LER-80-4-3L-1, NUDOCS 8003070338
Download: ML19294C227 (1)

LER-1980-004, /03L-0:on 800204,during Routine Surveillance, Reactor Protection Sys Channel B Trip Signal for RCP Underspeed Found Out of Specs.Caused by frequency-to-voltage Converter Being High & Unstable.Unit Replaced & Calibr

Event date:
Report date:
3361980004R03 - NRC Website

text

(7 77)

LICENSEE EVENT REPORT coNTnot otocki l l

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l lh (PLEASE PRINT on TYPE ALL REQUIRED INFORMATION) 1 0

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8 00 61 DOCKET NU'ME H 03 63 CVENT DATE 74 75 ItEPORT DAlt 80 EVENT DESCnIPTION AND PRODABLE CONSEQUE NCES h I..o 121 10uring routine surveillance the Reactor Protection System (RPS) channel B trip signal I

[ for Reactor Coolant Pump (RCP) underspeed was found to be out of specifications, high. I o 3 f6 Fl IThe trip unit was bypassed and operation continued in accordance with Technical 1

loisj Specifications section 3.3.1.1, Table 3.3-1, action 2b.

Afaultyfrequency-to-voltSce i f6 Fl lconverter was replaced with a spare unit and the RPS channel B trip on RCP underspeed l

l 0 l 7 l lwas restored to operable status.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CONNECTIVE ACTIONS h li 10 l l The frequency-to-voltage converter (DEVAR, Inc. series18-116) output was found tc be I l

l high and unstable. The failed unit was replaced with a snare unit arid calibratod.

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,,,,, ; returning the RCP speed sensing system for the RPS channel B to operable status.

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8 9 11 12 LOSS OF OH DAYAGE TO FACILITY l

TYPE DESCHIPTION IY IoI 111@l t1A e

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11. Bates 203-447-1791, Ext. 573 2,