05000346/LER-1980-046-03, /03L-0:on 800606,during Performance of ST 5095.01, Spent Fuel Pool Level Fell Below Tech Spec Requirement. Caused by Improper Alarm Setpoint.Alarm Setpoint Adjusted to Prevent Recurrence

/03L-0:on 800606,during Performance of ST 5095.01, Spent Fuel Pool Level Fell Below Tech Spec Requirement. Caused by Improper Alarm Setpoint.Alarm Setpoint Adjusted to Prevent Recurrence

ML19329F972
Person / Time
Site:	Davis Besse
Issue date:	07/03/1980
From:	Cech L TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329F969	List: 05000346/LER-1980-046, Forwards LER 80-046/03L-0 05000346/LER-1980-046-03, /03L-0:on 800606,during Performance of ST 5095.01, Spent Fuel Pool Level Fell Below Tech Spec Requirement. Caused by Improper Alarm Setpoint.Alarm Setpoint Adjusted to Prevent Recurrence
References
LER-80-046-03L, LER-80-46-3L, NUDOCS 8007110423
Download: ML19329F972 (2)

LER-1980-046, /03L-0:on 800606,during Performance of ST 5095.01, Spent Fuel Pool Level Fell Below Tech Spec Requirement. Caused by Improper Alarm Setpoint.Alarm Setpoint Adjusted to Prevent Recurrence

Event date:
Report date:
3461980046R03 - NRC Website

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.61 DOCKET NUM8ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 5095.01, the spent l l (NP-33-80-55) ~ 0n 6/6/80 at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br /> during the performance of ST o 2 l fuel pool level was found to be 6h;" below the Technical Specification 3.9.11 require-l o 3 The action state-l

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42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h The high/ low level alarm was set to actuatel 1

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1 lat 600 feet plant elevation (above sea level) which is 7-3/16 inches below the tech-i i 1nical specification level. The low alarm setpoint has been changed to actuate at l

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORQ\\ TION FOR LER NP-33-80-55 DATE OF EVENT:. Tune 6, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Spent Fuel Pool Level Low by 6-1/4 Inches Conditions Prior to Occurrence: The unit was in Mode 6, with Power (MWT) =, and Load (Gross MWE) = 0.

Description of Occurrence: On June 6, 1980, at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br />, during the performance cf Sur-eillance Test ST 5095.01, Water Level - Spent Fuel Fool, the equipment opera-tor found the spent fuel pool level to be at an elevation of 600 feet 4 inches plant olevation (above sea level) (22 f eet 5-3/4 ir.ches above the fuel assembly).

This is 6-1/4 inches below the requirement of Technical Specification 3.9.11, which re-quires 23 feet of water to be caintained over the top of irradiated fuel assemblies ceated in the storage racks.

The action statement requires the level to be restored within four hours. Level was restored by 1235 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.699175e-4 months <br />.

Designation of Apparent Cause of Occurrence: The cause of the occurrence was an improper alarm setpoint. The high/ low level alarm actuates for a high level at 602 feet, but does not actuate for a low level until 600 feet (22 feet 1-3/4 inches above the fuel assemblies) which is 10-1/4 inches below the' Technical Specification required level of 23 feet. The alarm also has a tolerance of plus or minus 1.5 inches. There-fore, the low level alarm would not actuate until after the Technical Specification had been violated.

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

There was 22 feet 5-3/4 inches of water covering the fuel assemblies which means the level was low by 6-1/4 inches.

The Technical Specification level was restored within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 15 minutes.

The event had no significant effect on pool radiation levels.

Corrective Action

By 1235 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.699175e-4 months <br /> on June 6, 1980, the level was restored which removed the station from the action statement of Technical Specification 3.9.11.

j The low level alarm setpoint has been changed to actuate at a higher level to pre-J vent recurrence.

Failure Data: There have been no previous similar reportable occurrences, 1

LER #80-046