ML20028E303

LER 82-027/03L-0:on 821211,operator Noted That Steam Generator Pressure Transmitter 1PT-469 Indicated Higher than Other Channels.Caused by Frozen Sensing Line Due to Inadequate Interim Piping Insulation

ML20028E303
Person / Time
Site:	Point Beach
Issue date:	01/11/1983
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028E300	List: ML20028E299 ML20028E303
References
LER-82-027-03L, LER-82-27-3L, NUDOCS 8301210195
Download: ML20028E303 (2)

Text

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7 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 lDuring normal surveillance of operating parameters at 2240, the operatorg O 3 Inoted that steam generator pressure transmitter 1PT-469 was indicating ;

o 4 ghigher than other channels. A frozen sensing line was suspected and con g io;3; ; firmed. Other pressure instrument channels were operating normally. Thip o o l event is reported under Technical Specification 15.6.9.2.B.2, as the re ,

go;,;[dundancy requirement was not met until the channel was tripped. Similar; o g g events were reported as LER's 76-13, 77-13 and 81-20. g

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34 35 l36Z l@ l 0l 0l 0l 0l 31 W@ [N lg ]g lC l 2 l6 l8 lg 40 41 42 _ 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li lo g [The event was caused by inadequate interim piping insulation during in- g i i lstallation of a modification to the heat tracing system. The instrument;

, 7 gwas placed in the tripped position and the sensing line was thawed with ;

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ATTACHMENT TO LICENSEE EVENT REPORT NO. 82-027/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 1 Docket No. 50-266 During normal operation, at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br /> on December 11,'1982 during normal surveillance of indicating parameters, the operator noted that steam generator pressure transmitter 1PT-469 was indicating higher than other channels. This indication is charac-teristic of freezing in a sensing line which was immediately suspected, since a modification of the heat tracing freeze pro-tection system was incomplete at the time of the event. The instrument channel inputs were placed in the tripped status in accordance with procedure and the required redundancy restored with the remaining two instruments. Attempts to blow down the sensing line were unsuccessful. The sensing line was success-fully thawed using a welding machine, and the line was periodically blown down thereafter to prevent freezing. The instrument was returned to service at 0140 hours0.00162 days <br />0.0389 hours <br />2.314815e-4 weeks <br />5.327e-5 months <br /> on December 12, 1982. Similar events were reported as Licensee Event Report Nos. 76-13, 77-13, and 81-20.

The cause of the freeze-up was due to inadequate interim insulation installed during modifications of the heat-tracing freeze protection system. The installation was originally expected to be completed during the refueling outage prior to startup. However, due to delays in engineering and the delivery of materials, installation could not begin until December 10, 1982. The new heat tracing equipment was energized on December 16 and the installation of the final wrap of in-sulation is expected to be complete by January 14, 1983.