SSINS No.: 6830 Accession No.: 8002280665 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 April 29, 1980 IE Circular No. 80-10 FAILURE TO MAINTAIN ENVIRONMENTAL QUALIFICATION OF EQUIPMENT Description of Circumstances: Carolina Power and Light recently reported that the wrong class of insulating material had been used at their H. B. Robinson Nuclear Plant when the motor leads of a containment fan cooler were reconnected. The motor leads had been disconnected during the refueling outage to supply power to welding equipment. When the motor leads were reconnected, the wrong class of insulating material degraded the environmental qualification of the containment fan cooler motor. A similar event, reported by Duquesne Light Company, occurred when a containment fan cooler motor was not installed with the proper cable insulation. The NRC has previously issued IE Circular 78-08 and IE Bulletins 79-01 and 79-01B concerning environmental qualification of Class 1E equipment. These Bulletins primarily address the environmental qualification of equipment as purchased and installed; however, the above events emphasize the importance of properly installing and maintaining environmentally qualified equipment. Recommended Action for Licensee Considerations: All holders of operating licenses or construction permits should recognize the potential for degradation of environmentally qualified equipment due to improper maintenance or improper use. It is recommended that licensees review current maintenance procedures and administrative policies to ensure the following: 1. Adequate administrative controls exist to ensure that equipment which is environmentally qualified is identified prior to maintenance. 2. Maintenance procedures provide necessary instructions and precautions to ensure that the environmental qualification of equipment is not degraded when maintenance is completed. 3. Maintenance personnel are adequately trained on environmental qualification requirements and the potential for equipment degradation from improper maintenance. No written response to this Circular is required. If you require additional information regarding this matter, contact the Director of the appropriate NRC Regional Office.
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