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 Enclosure

November 16, 1979

RECENTLY ISSUED

IE INFORMATION NOTICES

Information Subject Date Issued To

Notice No. Issued

79-27 Steam Generator Tube 11/16!:79 All Power reactor facilities

Ruptures At Two PWR holding OLs and CPs

Facilities79-12A Attempted Damage To New 11/9/7' All Fuel Facilities, Fuel Assemblies research reactors, and

Dower reactors with an

OL or CP

79-26 Breach of Containment 11/5/79 All power reactor facilities

Integrity holding OLs and CPs

79-25 Reactor Trips At Turkey 10/1/79 All nower facilities with

Point Units 3 And 4 an OL or a CP

79-24 Overoressurization Of 10/1/79 All power reactor facilities

Containment Of A PWR Plant with a CP

After A Main Steam Line

Break

79-23 Emergency Diesel Generator 9/26/79 All power reactor

Lube Oil Coolers facilities holding OLs

and CPs

79-22 Qualification of Control 9/14/7i9 All Dower reactor

Systems facilities with

operating licenses

and construction permits.

79-21 Transportation and Commercial 9/7/79 All power and research

Burial of Radioactive Material reactors with OL's

79-20 NRC Enforcement Policy c9/7/79 All Holders of Reactor

(Rev. 1) NRC Licensed Individuals nLs and CPs and Production

Licensees with Licensed

nperators

79-20 NRC Enforcement Policy 8/14/79 All Holders of Reactor

NRC Licensed Individuals OLs and CPs and Production

Licensees with Licensed

Onerators