Bulletin 74-003A: Failure of Structural or Seismic Support Bolts on Class I Components
ATOMIC ENERGY COMMISSION
WASHINGTON. D.C. 20545
APR 29 1974
J. P. O'Reilly, Director of Region I
N. C. Moseley, Director of Region II
J. G. Keppler, Director of Region III
E. M. Howard, Director of Region IV
R. H. Engelken, Director of Region V
SUPPLEMENTAL INFORMATION - RO BULLETIN #74-3 "FAILURE OF STRUCTURAL OR
SEISMIC SUPPORT BOLTS ON CLASS I COMPONENTS"
The enclosed supplemental information to previously issued RO Bulletin #74-3
is forwarded for dispatch to all BWR and PWR licensees wit,il Operating
License and those licensees having an anticipated fuel load date prior to
January 31, 1975.
Harold D. Thornburg, Chief
Field Support & Enforcement Branch
Directorate of Regulatory Operations
DRO Bulletin #74-3A
cc: D. F. Knuth, RO
J. G. Davis, RO
A. Giambusso, L
J. Hendrie, L
K. R. Goller, L
To All BWR and PWR With Current
Operating License and Those Date: 4/26/74
Having An Anticipated Fuel DRO Bulletin #74-3A
Load Date Prior to January 31, 1975
The enclosed supplement to DRO Bulletin No. 3 "Failure of Structural or
Seismic Support Bolts on Class I Components" is being sent to provide you
with additional information relative to the omission of certain stiffeners
and gussets in addition to defective welding reported at other facilities.
This information may have applicability at your facility(ies). Action
requested on your part is identified in Section B of the enclosed
Supplement to DRO Bulletin #74-3
SUPPLEMENTAL INFORMATION RELATING TO RO BULLETIN NO. 74-3A
Information was recently received that defective welding had been identified
on steam generator support structures supplied to VEPCO, the North Anna,
project, by Sun Shipyard Corporation of Chester, Pennsylvania. The Sun
Shipyard Corporation also supplied similar items for the Public Service
Electric & Gas Company, Salem 1 & 2, as well as the Consolidated Edison
Company, Indian Point 3, projects.
A. Description of Circumstances
A special inspection of these items at the Salem site revealed not only
areas of defective welding, but also omission of certain stiffeners and
gussets shown on design drawings. The Consolidated Edison Company also
noted similar type problems.
The Sun Shipyard Corporation indicates that no similar components were
provided other nuclear facilities.
B. Action Requested
In view of these particular type problems with seismic category 1
components as defined in Regulatory Guide 1.29, it is requested that:
1. The inspection program requested by Regulatory Operations Bulletin
74-3-"Failure of Structural or Seismic Support Bolts on Class 1
Components" include provisions that could detect problems of the
type outlined above regardless of your supplier.
- 2 -
As stated in Regulatory Operations Bulletin 74-3, RO inspectors will review
your detailed written programs and procedures.
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