ML19290E974

LER 80-017/03L-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

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: ML19290E970 ML19290E974
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8003170406
Download: ML19290E974 (2)

Text

LICENSEE EVENT REPORT g CONTROL etccic l l l \ 'i l 1@ (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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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 o 3 l Safety Features Actuation System (SFAS) Channel 3 Borated Water Storage Tank (BWST) g

] o .; l level indication was reading six feet higher than the other three indications. The l

} o s [ channel was declared inoperable at 2103 hours0.0243 days <br />0.584 hours <br />0.00348 weeks <br />8.001915e-4 months <br /> and placed in the tripped condition in  ;

i lo [s l l accordance with the action statement of T.S. 3.3.2.1. There was no danger to the  ;

_ l o l 7 l l health and safety of the public or station personnel. The remaining three BWST level j

_ l o l a l [ instrument strings were operable. (NP-33-80-23) 7 8 9 l SYSTEM CAUSE C A US E CODE CODE COYP. VALVE

~ SusCODE COMPONENT CODE SUSCOOE SUSCODE

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-EVENT YEAR REFORT RE VISION REPORT NO. CoOE TYPE O" ;LERy.o;rRO18 10 I l-l 10 11 17 I NO.

_2L 22 23 24 26 I/ 10131 IL I l---J 101 27 28 29 30 31 32 ACTION FU1URE FFFECT SHUTCOVJN TAKEN AC rlO*; ONPLANT ATT ACH'.t E NT P.P R O-4 PPl9E COYP. COMPoNE JT P?C TH OD HOURS 22 SV8Y)T110 FORM SUS- SvPPLIER ATANUFACTUREP lxiglxl@ Izig Izl@ 10 to lo l I l vig IN Ig lA lg 33 34 A so J/ 40 41 42 43 lJl0l7l3lg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ii o lThe cause was extremely cold weather ..nd high winds which caused the sensing line of l

[l i l i i l the level transmitter (LT1525C) to begin freezing up. A temporary windbreak was con- I

]!i(2) lstructed around the transmitter and with the aid of a portable heater Channel 3 was l

~tiea l made operable at 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> on February 17, 1980. An FCR was written to investigate l li ,j l building a permanent structure to provide protection.

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DVR 80-035 NAME OF PHEPARER Daniel Trautman 419-259-5000, Ext. 235 o PHONE: S 80031'7o 3

, 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

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FACILITY: Davis-Besse Unit 1 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