Assuring Adequacy Of Motor Repairs For Nuclear Power Plants

Repaired Motors for Nuclear Power Plants require that: (1) adequate controls and traceability exist for motor repair, (2) operability is not degraded by the repair, (3) special nuclear capable materials are used when required, (4) appropriate consideration be given to the driven load requirements, and (5) s ecial adequacy and performance testin is compreted demonstrating suitability, especiah y for Nuclear Safety Related service subsequent to repair. An evolving consensus of “good practice” is developing based on industr experience feedback, guidance from IEEE standards development, EPRI research, and the Electric Apparatus Service Association practices. Adequacy re uires careful attention to Commercial %rade Item Dedication, Qualification, and Quality Processes. This paper presents various considerations for motor inspection, assessment, material procurement, documentation, repair, determination of critical characteristics, and testin to allow retention or enhancement of original fesign qualification and demonstrated capability for the motor being repaired.