IE Circular No. 80-10, Failure to Maintain Environmental Qualification of Equipment
SSINS No.: 6830
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
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.
Page Last Reviewed/Updated Tuesday, September 01, 2015