Morning Report for March 1, 2007

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Part 21 2007-0004 - Chiller Copper Sleeve Cracks Leading To Slow Refrigerant Discharge




License No:

MR Number: H-2007-0003
Date: 02/27/2007

Reviewer: John Thorp


On December 27, 2006, Public Service Electric & Gas Company (PSE&G) notified Carrier Corporation (the supplier) of four separate instances where a crack had occurred in the copper sleeve of the compressor and bearing discharge temperature sensor. The crack in the sensor's copper sleeve resulted in a leak of refrigerant from the chiller compressor. PSE&G noted that it had observed this condition on four occasions, three of which occurred on chillers with safety-related applications. The fourth sensor sleeve cracking problem affected a non-safety related chiller. If the refrigerant leak continues uncorrected, enough refrigerant can be lost to cause the chiller to be automatically shut down by a separate safety feature.

Since mid- 2001 Carrier has sold this temperature sensor to Limerick Generating Station, Hope Creek Generating Station, Salem Generating Station, Catawba Nuclear Station, McGuire Nuclear Station, Braidwood Station, Perry Nuclear Power Plant, San Onofre Nuclear Generating Station, and Waterford 3 Steam Electric Station.

For more information concerning this condition, please see NRC event notification (EN) 43190 available on NRC public Webpage, or in Agency-wide Document Access and Management System (ADAMS) with accession number ML070600121.


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