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


==Description of Circumstances==
No.: 791025O4X5 UNITED STATES NUCLEAR REGULATORY
: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 required.


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
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}}


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

Revision as of 13:22, 31 August 2018

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 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


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