Information Notice 1979-28, Overloading of Structural Elements Due to Pipe Support Loads

Overloading of Structural Elements Due to Pipe Support Loads

ML031180186
Person / Time
Site:	05000000
Issue date:	11/16/1979
From:	NRC/IE
To:
References
IN-79-028, NUDOCS 7910250485
Download: ML031180186 (2)

SSINS NO: 6870 t Accession

No.: 791025O4X5 UNITED STATES NUCLEAR REGULATORY

COMMISSION

OFFICE OF INSPECTION

AND ENFORCEMENT

WASHINGTON, D.C. 20555 November 16, 1979 IE 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

Enaineer 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) Inadeouate

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 a layer of grout between them.The NRC is currently

pursuing these issues in detail for the Trojan Nuclear Plant to determine

the extent of these deficiencies

and the generic implications

for other Bechtel facilities.

This Information

Notice is provided as an early notification

of a possible signif-icant matter. It is expected that recipients

will review the information

for possible applicability

to their facilities

and the actions 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 IE Information

Notice is required.

IE Information

Notice No. 79-28 November 16, 1979 RECENTLY ISSUED IE INFORMATION

NOTICES Enclosure Information

Notice No.Subject Date Issued Issued To 79-27 79-12A 79-26 79-25 79-24 Steam Generator

Tube 11/16!: Ruptures At Two PWR Facilities

Attempted

Damage To New 11/9/7'Fuel Assemblies

Breach of Containment

11/5/79 Integrity Reactor Trips At Turkey 10/1/79 Point Units 3 And 4 Overoressurization

Of 10/1/79 Containment

Of A PWR Plant After A Main Steam Line Break Emergency

Diesel Generator

9/26/79 Lube Oil Coolers Qualification

of Control 9/14/7i Systems Transportation

and Commercial

9/7/79 Burial of Radioactive

Material 79 All Power reactor facilities

holding OLs and CPs All Fuel Facilities, research reactors, and Dower reactors with an OL or CP All power reactor facilities

holding OLs and CPs All nower facilities

with an OL or a CP All power reactor facilities

with a CP All power reactor facilities

holding OLs and CPs 79-23 79-22 79-21 9 All Dower reactor facilities

with operating

licenses and construction

permits.All power and research reactors with OL's All Holders of Reactor nLs and CPs and Production

Licensees

with Licensed nperators 79-20 (Rev. 1)NRC Enforcement

Policy NRC Licensed Individuals

NRC Enforcement

Policy NRC Licensed Individuals

c 9/7/79 79-20 8/14/79 All Holders of Reactor OLs and CPs and Production

Licensees

with Licensed Onerators