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 tAccession No.: 791025O4X5UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF INSPECTION AND ENFORCEMENTWASHINGTON, D.C. 20555November 16, 1979IE Information Notice No. 79-28OVERLOADING OF STRUCTURAL ELEMENTS DUE TO PIPE SUPPORT LOADS
{{#Wiki_filter: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==
==Description of Circumstances==
:Recently, the NRC was informed that, in the course of the inspections pursuantto IE Bulletin No. 79-02 and 79-14 by the Portland General Electric Co. (PGE) atthe Trojan Nuclear Plant, some walls were found which did not have adequatestructural strength to sustain the required support reactions. Bechtel Corporationwas the Architect Enaineer for the plant. These structural inadequacies werereported to be attributable to two deficiencies:1) Apparent lack of a final check of certain pipe support locations and reactionsto ensure that the supporting structural elements possessed adequatestructural integrity to sustain the required loads.2) Inadeouate design criteria for the reactions from supports anchored intothe face of concrete block walls; e.g., relying on the combined strengthof double concrete block walls without positive connection between thetwo walls by means other than the bond provided by a layer of grout betweenthem.The NRC is currently pursuing these issues in detail for the Trojan Nuclear Plantto determine the extent of these deficiencies and the generic implications forother 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 forpossible applicability to their facilities and the actions being performed underIE Bulletin No. 79-02. Specific action is being requested relating to the adequacyof 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 orrequired. If you have any questions regarding this matter, please contact theDirector of the appropriate NRC Regional Office.No written response to this IE Information Notice is require IE Information Notice No. 79-28November 16, 1979RECENTLY ISSUEDIE INFORMATION NOTICESEnclosureInformationNotice No.SubjectDateIssuedIssued To79-2779-12A79-2679-2579-24Steam Generator Tube 11/16!:Ruptures At Two PWRFacilitiesAttempted Damage To New 11/9/7'Fuel AssembliesBreach of Containment 11/5/79IntegrityReactor Trips At Turkey 10/1/79Point Units 3 And 4Overoressurization Of 10/1/79Containment Of A PWR PlantAfter A Main Steam LineBreakEmergency Diesel Generator 9/26/79Lube Oil CoolersQualification of Control 9/14/7iSystemsTransportation and Commercial 9/7/79Burial of Radioactive Material79 All Power reactor facilitiesholding OLs and CPsAll Fuel Facilities,research reactors, andDower reactors with anOL or CPAll power reactor facilitiesholding OLs and CPsAll nower facilities withan OL or a CPAll power reactor facilitieswith a CPAll power reactorfacilities holding OLsand CPs79-2379-2279-219 All Dower reactorfacilities withoperating licensesand construction permits.All power and researchreactors with OL'sAll Holders of ReactornLs and CPs and ProductionLicensees with Licensednperators79-20(Rev. 1)NRC Enforcement PolicyNRC Licensed IndividualsNRC Enforcement PolicyNRC Licensed Individualsc9/7/7979-208/14/79 All Holders of ReactorOLs and CPs and ProductionLicensees with LicensedOnerators}}
:
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
 
Facilities
 
79-12A        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}}


{{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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