05000346/LER-1978-010-03, /03L-0:on 780115, Reactor Coolant Pump Monitor on Channel 1 Found Out of Tolerance & Reactor Protection Sys Declared Inoperable.Caused by Defective Module.New Module Calibr & Installed

/03L-0:on 780115, Reactor Coolant Pump Monitor on Channel 1 Found Out of Tolerance & Reactor Protection Sys Declared Inoperable.Caused by Defective Module.New Module Calibr & Installed

ML19326A146
Person / Time
Site:	Davis Besse
Issue date:	01/15/1978
From:	TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A144	List: 05000346/LER-1978-010, Forwards LER 78-010/O3L-0 05000346/LER-1978-010-03, /03L-0:on 780115, Reactor Coolant Pump Monitor on Channel 1 Found Out of Tolerance & Reactor Protection Sys Declared Inoperable.Caused by Defective Module.New Module Calibr & Installed
References
LER-78-010-03L, LER-78-10-3L, NUDOCS 8002030022
Download: ML19326A146 (2)

LER-1978-010, /03L-0:on 780115, Reactor Coolant Pump Monitor on Channel 1 Found Out of Tolerance & Reactor Protection Sys Declared Inoperable.Caused by Defective Module.New Module Calibr & Installed

Event date:
Report date:
3461978010R03 - NRC Website

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EVENT OESCRtPTION AND PROBA81.E CONSEQUENCES h " Reactor Protection Sys tem (

l During the performance of ST 5030.02, O'Ti] l tional Test".at 2050 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.80025e-4 months <br /> on January 15, 1978, the Reactor Coolant Pump monitor on I

o, f, l o,4 ; l Channel I was found to be out of tolerance.

RPS Channel I was declared inoperable.

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Since the unit was in Mode 3 at the time of the occurrence, it did not place the uniti o;3, ;

3 of Technical Specification 3.3.1.1, which is applicable oniv ini og,l in Action Statement There was no danger to the health and safety of the public or to unit l o;7ll Modes 1 and 2.

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(NP-33-78-12)

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A I l i l o ) ] The cause of this occurrence was a defective Reactor Coolant I

Iiiij l new module was calibrated and installed under Maintenanca Noek 0 + - tac l't

'a 16, 1978, ST 5030.02 was completed for RPS

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- TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR-POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-12 DATE OF EVENT: January 15, 1978 e

- FACILITY: Davis-Besse Unit 1

- IDENTIFICATION CF OCCURRENCE: Reactor Protection System (RPS) Channel 1 Ceactor Coolant Pump Monitor out or tolerance.

Conditions Prior to Occurrence:.The unit was.in Mode 3, with Power (MRT) = 0 and Load (MRE)

=-0.

Description of Occurrence: During t:ie performance of Surveillance Test ST 5030.02,

" Reactor-Protection System Monthly Functional Test" at 2050 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.80025e-4 months <br /> on January 15, 1978, the Reactor Coolant Pump monitor on Channel 1 was found to be out of toler-ance.

RPS Channel 1 was declared inoperable.

Since the unit was in Mode 3 at the time of the occurrence, it did not place the unit in Action Statement 3 of Technical Specification 3.3.1 which is applicable in Modes 1 and 2.

_ RPS Channel

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1 was placed in the tripped condition at 2120 hours0.0245 days <br />0.589 hours <br />0.00351 weeks <br />8.0666e-4 months <br /> on January 15.

The three

) other RPS Channels were operable, s%/

Designation of Apnarent Cause of Occurrence: The cause of this occurrence was a defective Reactor Coolant Pump monitor module.

Instrument and Control personnel attempted to recalibrate the module, but the instrument could not' be properly recalib'ra t ed.

On January 16, 1978 at 0215 hours0.00249 days <br />0.0597 hours <br />3.554894e-4 weeks <br />8.18075e-5 months <br />, Instrument and Control person-nel calibrated and installed a new Reac.cor Coolant Pump monitor module in RPS Channel 1.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel.

The unit was in Mode 3 at the time of the occur-rence. The remaining three RPS Channels were operable..

4

Corrective Action

A new module was calibrated'and installed under Maintenance Work Order ISC 124-78.

At approximately 0330 hours0.00382 days <br />0.0917 hours <br />5.456349e-4 weeks <br />1.25565e-4 months <br /> on January'16, 1978, Surveil-lance Test ST 5030.02 was completed for RPS Channel 1, and Channel I was declared operable.

i Failure Data: -There have beeen no previously reported occurrences of RPS trips caused by modules that were out of tolerance.

x-L '- LER #78-010

i N

'"ZOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION PACE 2_

t SUPPLEMENTAL INFORMATION FOR LER NP-33-78-10

Corrective Action

The two Containment Spray Pump circuit breakers were racked in at 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br /> on January 12, 1978, returning both Containment Spray Pumps This removed the unit from Limiting Condition for Opera-to operable status.

i tion 3.0.3 and from excess of Technical Specification 3.6.2.1.

This incident has been reviewed with the responsible persons and the incident will be reviewed with all operators during normal training sessions.

The plant Startup Procedure is being modified to include steps to rack in the breakers.

Failure Data: This is not a repetici.ve occurrence.

LER #78-003

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