05000346/LER-1980-017-03, /03L-0:on 800217,operations Personnel Noted That Safety Features Actuation Sys Channel 3 Borated Water Storage Tank Level Indication Was Six Feet Higher than Other Meters.Caused by Freezing of Transmitter Sensing Line

/03L-0:on 800217,operations Personnel Noted That Safety Features Actuation Sys Channel 3 Borated Water Storage Tank Level Indication Was Six Feet Higher than Other Meters.Caused by Freezing of Transmitter Sensing Line

ML19290E974
Person / Time
Site:	Davis Besse
Issue date:	03/13/1980
From:	Trautman D TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19290E971	List: 05000346/LER-1980-017, Forwards LER 80-017/03L-0 05000346/LER-1980-017-03, /03L-0:on 800217,operations Personnel Noted That Safety Features Actuation Sys Channel 3 Borated Water Storage Tank Level Indication Was Six Feet Higher than Other Meters.Caused by Freezing of Transmitter Sensing Line
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8003170406
Download: ML19290E974 (2)

LER-1980-017, /03L-0:on 800217,operations Personnel Noted That Safety Features Actuation Sys Channel 3 Borated Water Storage Tank Level Indication Was Six Feet Higher than Other Meters.Caused by Freezing of Transmitter Sensing Line

Event date:
Report date:
3461980017R03 - NRC Website

text

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~ loJ21 lOn February 17,1980 at 2048 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.79264e-4 months <br />, it was noted by operations personnel that the l Safety Features Actuation System (SFAS) Channel 3 Borated Water Storage Tank (BWST) o 3

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ii lThe cause was extremely cold weather..nd high winds which caused the sensing line of o

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Daniel Trautman 419-259-5000, Ext. 235 DVR 80-035 NAME OF PHEPARER o

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLE > ENTAL INFORMATION FOR LER NP-33-80-23 DATE OF EVENT:

February 17, 1980 FACILITY: Davis-Besse Unit 1

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IDENTIFICATION OF OCCURRENCE:

Borated Water Storage Tank (BWST) Level Indication in Safety Features Actuation System (SFAS) Channel 3 was out of tolerance Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2753, and Load (Gross FME) = 915.

Description of Occurrence:

On February 17, 1980 at 2048 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.79264e-4 months <br />, it was noted by operations personnel that the SFAS Channel 3 BWST level indication was reading approximately six feet higher than the other three BWST level indications. The channel was declared inoperable by operations personnel and at 2103 hours0.0243 days <br />0.584 hours <br />0.00348 weeks <br />8.001915e-4 months <br />, the channel was placed in the tripped condition. This occurrence placed the unit in Action Statement 9 of Technical Specification 3.3.2.1.

This technical specifica-tion states that BWST level instrument strings shall be operabic in Modes 1, 2, and 3.

Action Statement 9 states that with one channel inoperable, operation may proceed provided (a) the inoperable unit is placed in the tripped condition within one hour, and (b) the remaining three channels are operable.

Designation of Apparent Cause of Occurrence: The apparent cause of the occurrence was the extremely cold weather conditions which caused the sensing line of the level transmitter (LT 1525C) to begin freezing up.

Facility Change Request 79-123 (impic-mented December 13, 1979) which installed new enclosures around the level transmitters and relocated heat trace temperature sensors to worst case locations, was insufficient to protect against freezing during high wind conditions.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The remaining three BWST level instrument strings were operable during the period which Channel 3 BWST level instrument string was inopera-ble.

Corrective Action

On February 17, 1980 at 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br />, a temporary windbreak was constructed around the BWST level transmitter and a portable propane heater placed inside the windbreak.

Within a short period of time af ter application of additional heating, the Channel 3 BUST 1cvel indication returned to normal.

Surveillance Test ST 5099.01 was performed and on February 17, 1980, the Channel 3 BWST level instrument was declared operable. This removed the unit from the action statement. Toledo Edison is investigating further means of improving freeze protec-tion.

Failure Data: Previous similar incidents occurring concerning BWST level indication failures due to freezing were reported under Licensee Event Reports NP-33-77-107, NP-33-78-01 (78-001), NP-33-79-32 (79-028) and NP-33-78-142 (78-121).

LER #80-017