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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 47741 | 14 March 2012 04:00:00 | 10 CFR 21.21 | Part 21 - Potential Defect on Arvan Electrical Terminal Blocks | The following information was provided by facsimile: COMPONENT DESCRIPTION: Arvan electrical terminal blocks, part number MS27212-x-xx, Revision P, sizes -3-xx and -5-xx. any length; Ametek Solidstate Controls part number 03-120608-00. Only lots purchased from 2010 to present are of concern. PROBLEM YOU COULD SEE: A mottled or marbled appearance, vertical cracks and/or a slim void/flow line on a cut section of the terminal block, CAUSE: The manufacturer's investigation revealed that an improper application of acetone agent, which ensures proper bonding/blending of materials, was not properly monitored and resulted in intermittent inadequate blending. Not every lot or complete batch run is affected. EFFECT ON SYSTEM PERFORMANCE: Cracks and/or voids in the material could be exploited should a seismic event occur. ACTION REQUIRED: We have no known failures of these terminal block products in our systems. We believe the failure rate has been extremely low and the risk is minimal. Each operating facility will need to evaluate the potential risk to their operation. AMETEK SOLIDSTATE CONTROLS CORRECTIVE ACTION: If you wish to replace the terminal blocks in your systems, Ametek Solidstate Controls will work with you to arrange replacements. Please contact our Client Services group at 1-800-222-9079 or 614-846-7500 ext. 6260. The nuclear sites identified by the licensee to have these potentially defective parts are: Beaver Valley, Ginna, Harris, Hatch, VC Summer, Watts Bar, Braidwood, Byron, Cook, Davis Besse, Prairie Island, Arkansas Nuclear One, San Onofre Nuclear Generating Station, and South Texas Project. |