Information Notice 1979-28, Overloading of Structural Elements Due to Pipe Support Loads: Difference between revisions

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{{#Wiki_filter:SSINS NO: 6870 t Accession
{{#Wiki_filter:SSINS NO: 6870         t


No.: 791025O4X5 UNITED STATES NUCLEAR REGULATORY
Accession No.: 791025O4X5 UNITED STATES


COMMISSION
NUCLEAR REGULATORY COMMISSION


OFFICE OF INSPECTION
OFFICE OF INSPECTION AND ENFORCEMENT


===AND ENFORCEMENT===
WASHINGTON, D.C. 20555 November 16, 1979 IE Information Notice No. 79-28 OVERLOADING OF STRUCTURAL ELEMENTS DUE TO PIPE SUPPORT LOADS
WASHINGTON, D.C. 20555 November 16, 1979 IE Information


Notice No. 79-28 OVERLOADING
==Description of Circumstances==
:
Recently, the NRC was informed that, in the course of the inspections pursuant


OF STRUCTURAL
to IE Bulletin No. 79-02 and 79-14 by the Portland General Electric Co. (PGE) at


ELEMENTS DUE TO PIPE SUPPORT LOADS Description
the Trojan Nuclear Plant, some walls were found which did not have adequate


of Circumstances:
structural strength to sustain the required support reactions. Bechtel Corporation
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
was the Architect Enaineer for the plant. These structural inadequacies were


strength to sustain the required support reactions.
reported to be attributable to two deficiencies:
1) Apparent lack of a final check of certain pipe support locations and reactions


===Bechtel Corporation===
to ensure that the supporting structural elements possessed adequate
was the Architect


Enaineer for the plant. These structural
structural integrity to sustain the required loads.


inadequacies
2) Inadeouate design criteria for the reactions from supports anchored into


were reported to be attributable
the face of concrete block walls; e.g., relying on the combined strength


to two deficiencies:
of double concrete block walls without positive connection between the
1) Apparent lack of a final check of certain pipe support locations


and reactions to ensure that the supporting
two walls by means other than the bond provided by a layer of grout between


structural
them.


elements possessed
The NRC is currently pursuing these issues in detail for the Trojan Nuclear Plant


adequate structural
to determine the extent of these deficiencies and the generic implications for


integrity
other Bechtel facilities.


to sustain the required loads.2) Inadeouate
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


design criteria for the reactions
possible applicability to their facilities and the actions being performed under


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
IE Bulletin No. 79-02. Specific action is being requested relating to the adequacy


between the two walls by means other than the bond provided by a layer of grout between them.The NRC is currently
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.


pursuing these issues in detail for the Trojan Nuclear Plant to determine
If NRC evaluations so indicate, further licensee actions may be requested or


the extent of these deficiencies
required. If you have any questions regarding this matter, please contact the


and the generic implications
Director of the appropriate NRC Regional Office.


for other Bechtel facilities.
No written response to this IE Information Notice is required.


This Information
IE Information Notice No. 79-28                                    Enclosure


Notice is provided as an early notification
===November 16, 1979===
                                RECENTLY ISSUED


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


will review the information
Information    Subject                        Date        Issued To


for possible applicability
Notice No.                                    Issued


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


and the actions being performed
Ruptures At Two PWR                      holding OLs and CPs


under IE Bulletin No. 79-02. Specific action is being requested
Facilities


relating to the adequacy of attachments
79-12A        Attempted Damage To New        11/9/7'  All Fuel Facilities, Fuel Assemblies                          research reactors, and


to concrete block walls under IE Bulletin No. 79-02, Revision 2, item 5.c. No specific actions are requested
Dower reactors with an


in response to this Information
OL or CP


Notice.If NRC evaluations
79-26        Breach of Containment          11/5/79    All power reactor facilities


so indicate, further licensee actions may be requested
Integrity                                  holding OLs and CPs


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


If you have any questions
Point Units 3 And 4                        an OL or a CP


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


this matter, please contact the Director of the appropriate
Containment Of A PWR Plant                with a CP


NRC Regional Office.No written response to this IE Information
After A Main Steam Line


Notice is required.
Break


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


Notice No. 79-28 November 16, 1979 RECENTLY ISSUED IE INFORMATION
Lube Oil Coolers                          facilities holding OLs


===NOTICES Enclosure Information===
and CPs
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
79-22          Qualification of Control      9/14/7i9  All Dower reactor


Attempted
Systems                                  facilities with


Damage To New 11/9/7'Fuel Assemblies
operating licenses


Breach of Containment
and construction permits.


11/5/79 Integrity Reactor Trips At Turkey 10/1/79 Point Units 3 And 4 Overoressurization
79-21          Transportation and Commercial 9/7/79     All power and research


Of 10/1/79 Containment
Burial of Radioactive Material            reactors with OL's


Of A PWR Plant After A Main Steam Line Break Emergency
79-20        NRC Enforcement Policy        c9/7/79      All Holders of Reactor


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


9/26/79 Lube Oil Coolers Qualification
Licensees with Licensed


of Control 9/14/7i Systems Transportation
nperators


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


9/7/79 Burial of Radioactive
NRC Licensed Individuals                  OLs and CPs and Production


===Material 79 All Power reactor facilities===
Licensees with Licensed
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
Onerators}}
 
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}}


{{Information notice-Nav}}
{{Information notice-Nav}}

Latest revision as of 03:40, 24 November 2019

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)
v • d • e


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


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