Bulletin 77-05A: Electrical Connector Assemblies
NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C. 20555 November 14, 1977 IE Bulletin 77-05A ELECTRICAL CONNECTOR ASSEMBLIES Description of Circumstances: This Bulletin is a supplement to IE Bulletin 77-05, issued November 8, 1977, and the two documents should be considered together. Bulletin 77-05 described the failure, under test conditions, of a general type of electrical connector. The tests were intended to simulate post-LOCA conditions, therefore the action requested in the Bulletin focused on the qualification of electrical connectors for use inside containment. Since issuance of Bulletin 77-05, our attention has been called to circumstances which indicate that the scope of the action requested should be expanded and therefore the response to Bulletin 77-05 should reflect the expanded scope. Electrical connectors should be qualified to perform their intended function after having been subjected to accident conditions if they are contained in a system whose function is to mitigate that accident. The location of the connectors that must be qualified is not limited to those inside containment. Action To Be Taken By Licensees and Permit Holders: 1. Actions requested by Bulletin 77-05 should be expanded to include all connectors in safety systems which are required to function to mitigate an accident where the accident itself could adversely affect the ability of the system to perform its safety function. The examination is not to be limited to only LOCA's nor to areas only within containment. 2. Responses should be provided within 30 or 60 days, as appropriate, of the date of this supplement. Approved by GAO, B180225 (R0072); clearance expires 7-31-80. Approval was given under a blanket clearance specifically for identified generic problems.
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