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
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
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
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