Proposed Generic Communication; ``Voltage-Based Repair Criteria For The Repair Of Westinghouse Steam Generator Tubes Affected By Outside Diameter Stress Corrosion Cracking''

摘要

The Nuclear Regulatory Commission (NRC) is proposing to issue a generic letter. A generic letter is an NRC document that: (1) Requests licensees to submit analyses or descriptions of proposed corrective actions, or both, regarding matters of safety, safeguards, or environmental significance, or (2) requests licensees to submit information to the NRC on other technical or administrative matters, or (3) transmits information to licensees regarding approved changes to rules or regulations, the issuance of reports or evaluations of interest to the industry, or changes to NRC administrative procedures. When issued, this generic letter will provide guidance for licensees who may wish to request a license amendment to the plant technical specifications to implement an alternate steam generator tube repair limit applicable specifically to outside diameter stress corrosion cracking at the tube-to-tube support plate intersections in Westinghouse designed steam generators having drilled-hole tube support plates. This generic letter is intended to provide relief while maintaining an acceptable level of safety for licensees having steam generators experiencing this particular degradation mechan