Information Notice No. 79- 28, Overloading of Structural Elements Due to Pipe Support Loads
IN79028
November 16, 1979
MEMORANDUM FOR: B. H. Grier, Director, Region I
J. P. O'Reilly, Director, Region II
J. G. Keppler, Director, Region III
K. V. Seyfrit, Director, Region IV
R. H. Engelken, Director, Region V
FROM: Norman C. Moseley, Director, Division of Reactor
Operations Inspection, Office of Inspection and
Enforcement
SUBJECT: Information Notice No. 79- 28, OVERLOADING OF
STRUCTURAL ELEMENTS DUE TO PIPE SUPPORT LOADS
The subject Information Notice No. should be dispatched on November 16,
1979 to all power reactor facilities with an operating license or
construction permit. Enclosed is a draft copy of the transmittal letter for
this purpose.
Norman C. Moseley, Director
Division of Reactor Operations
Inspection
Office of Inspection and Enforcement
Enclosures:
1. Draft Transmittal Letter
2. Information Notice No. 79-28
CONTACT: H. J. Wong, IE
49-28180
.
(Draft letter to all power reactor facilities with an operating license or
construction permit)
Information Notice No. 79-28
Addressee:
The enclosed Information Notice No. 79-28 provides information on the
overloading of structural elements due to pipe support loads.
Sincerely,
Signature
(Regional Director)
Enclosures:
1. Information Notice No. 79-28
2. Recently Issued IE
Information Notices
.
Attachment 1
SSINS No.: 6870
Accession No.:
7910250475
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF INSPECTION AND ENFORCEMENT
WASHINGTON, D.C. 20555
November 16, 1979
Information Notice No. 79-28
OVERLOADING OF STRUCTURAL ELEMENTS DUE TO PIPE SUPPORT LOADS
Description of Circumstances:
Recently, the NRC was informed that, in the course of the inspections
pursuant to IE Bulletin No. 79-02 and 79-14 by the Portland General Electric
Co. (PGE) at the Trojan Nuclear Plant, some walls were found which did not
have adequate structural strength to sustain the required support reactions.
Bechtel Corporation was the Architect Engineer for the plant. These
structural inadequacies were reported to be attributable to two
deficiencies:
1) Apparent lack of a final check of certain pipe support locations and
reactions to ensure that the supporting structural elements possessed
adequate structural integrity to sustain the required loads.
2) Inadequate design criteria for the reactions from supports anchored
into the face of concrete block walls; e.g., relying on the combined
strength of double concrete block walls without positive connection
between the two walls by means other than the bond provided by layer of
grout between them.
The NRC is currently pursuing these issues in detail for the Trojan Nuclear
Plant to determine the extnet of these deficiencies and the generic
implications for other Bechtel facilities.
This Information Notice is provided as an early notification of a possible
significant matter. It is expected that recipients will review the
information for possible applicability to their facilities and the actins
being performed under IE Bulletin No. 79-02. Specific action is being
requested relating to the adequacy of attachments to concrete block walls
under IE Bulletin No. 79-02, Revision 2, item 5.c. No specific actions are
requested in response to this Information Notice. If NRC evaluations so
indicate, further licensee actions may be requested or required. If you have
any questions regarding this matter, please contact the Director of the
appropriate NRC Regional Office.
No written response to this Information Notice No. is required.
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