Bulletin 78-12B: Atypical Weld Material in Reactor Pressure Vessel Welds
NUCLEAR REGULATORY COMMISSION
OFFICE OF INSPECTION AND ENFORCEMENT
WASHINGTON, D.C. 20555
March 19, 1979
IE Bulletin No. 78-12B
ATYPICAL WELD MATERIAL IN REACTOR PRESSURE VESSEL WELDS
Description of Circumstances:
This Bulletin is a supplement to IE Bulletins 78-12 and 12A and all three
documents must be collectively considered to provide an adequate response to
Following the issuance of IE Bulletin 78-12A, members of the Office of
Inspection and Enforcement staff met with representatives from the reactor
vessel manufacturers and suppliers to discuss the requirements of the
bulletins. During these meetings, detailed interpretation of the data
requirements was provided based on the manufacturer's respective methods of
fabrication and record systems.
Recognizing that the scope of the record review is extensive, additional
time to respond to the bulletins is provided by this supplement.
Action to be Taken by Licensees and Permit Holders:
This bulletin applies to all power reactor facilities with an operating
license or a construction permit, except those already identified as
possibly having atypical weld material.
Responses to the requirements in Bulletins 78-12 and 12A shall be submitted
in writing in accordance with the following schedule:
1. Generic reports from each reactor vessel manufacturer shall be
submitted to the NRC by May 1, 1979.
2. The licensee responses shall be submitted by May 29, 1979. The
licensee's response shall include all of the specific vessel
information required by the bulletins which is not covered by the
vessel manufacturers generic report and shall indicate that the
licensee is satisfied that the generic report adequately represents
data for the specific vessels covered by the licensee's report.
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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