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{{#Wiki_filter:.0REGULATORYliVFORMATIONDISTHIOUTION SYSTEM(RIPS)ACCESSION IVBRo7904120263 DOC~DAI'Eo79/04/06NOTARIZED
{{#Wiki_filter:.0 REGULA TORY liVFORMA TION D I STHIOUTION SYSTEM (R IPS)ACCESSION IVBRo 7904120263 DOC~DA I'E o 79/04/06 NOTARIZED<NO DOCKET FAG IL:50 387 SUSQUEHANNA STEAM ELECTRIC S TATION UiVIT 1 PEtVNSYLVA 050003 50-388 SUSQUE<AiutuA STEAM ELECTRIC STATION UNIT 2 PENNSYLVA 0500 8 AUTH~NAtlF AUTHOR AFF IL I A SION C U R T I S F N~'TBT'PFNiNS YL V AN I A POWER tt L IGH T CO~HECIP,iVAME HECIP IENT AFFILIATION GRIEH FB~H~REGION 1 PHILADELPHIA OFFICE OF THE DIRECTOR
<NODOCKETFAGIL:50387SUSQUEHANNA STEAMELECTRICSTATIONUiVIT1PEtVNSYLVA 05000350-388SUSQUE<AiutuA STEAMELECTRICSTATIONUNIT2PENNSYLVA 05008AUTH~NAtlFAUTHORAFFILIASIONCURTISFN~'TBT'PFNiNSYLVANIAPOWERttLIGHTCO~HECIP,iVAME HECIPIENTAFFILIATION GRIEHFB~H~REGION1PHILADELPHIA OFFICEOFTHEDIRECTOR


==SUBJECT:==
==SUBJECT:==
FORWARDSFlNALHEPTUf:UNDERSIZED
FORWARDS FlNAL HEPT Uf: UNDERSIZED
'r'ELDSONSAFETYRELATEDPIPEHANGFHS~8,g0-s8'7DISTRIBUTION COOK:BDINSCOPIESREEIVES:LfENCLJSIZE:5+~~TITLE:CONSTRUCTION DEFICIENCY REPORT(IOCFN50~555)~NOTES:+~D5+~>~CgF5'Rlt'&TOTS~RECIPIENT IOCODE/NAME ACTION:14PtlH<p46fZ.20LACEE)gINTERNAL:
'r'ELDS ON SAFETY RELATED PIPE HANGFHS~8, g 0-s8'7 DISTRIBUTION COOK: BDINS COPIES RE E IVES:L f ENCL J SIZE: 5+~~TITLE: CONSTRUCTION DEFICIENCY REPORT (IOCFN50~555)~NOTES:+~D 5+~>~Cg F5'Rlt'&TOTS~RECIPIENT IO CODE/NAME AC T ION: 14 Ptl H<p46fZ.20 LA C EE)g INTERNAL: 0 05 IHE 08 tlP A 10 QAB 12 JDROANt E/IE 16 AO FOR ENGR 17 AO REAC SFTY 22 DIR DPM EXTERNAL: 03 LPOR 24 ACRS COPIES LTTH ENCL 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 16 lb REC IP IENr ID CODE/NAME 15 BC tF@le g AD<MMc.c O 02 NHC PDR 07 EOO 8 STAFF 09 OEPY OIR DPM 11 STANORDS OFV 13F IELD COOR/IE 17 AO PLANT SYS 19 AD SYS/PROJ 23 OELD 04 NSIC COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1<PR 18 1ggg TOTAL IVUMt3ER OF COP IES REQUIRED: LTTR 39 ENCL 39
005IHE08tlPA10QAB12JDROANtE/IE16AOFORENGR17AOREACSFTY22DIRDPMEXTERNAL:
03LPOR24ACRSCOPIESLTTHENCL11122111111111111116lbRECIPIENrIDCODE/NAME 15BCtF@legAD<MMc.cO02NHCPDR07EOO8STAFF09OEPYOIRDPM11STANORDSOFV13FIELDCOOR/IE17AOPLANTSYS19ADSYS/PROJ23OELD04NSICCOPIESLTTRENCL11111111111111111<PR181gggTOTALIVUMt3EROFCOPIESREQUIRED:
LTTR39ENCL39


TWONORTHNINTHSTREET,ALLENTOWN, PA.18101PHONE:(215)8215151NORMANW.CURTISVicePresident Engineerin8 ILCcnstrtrcticn 821-5381April6,1979RECULATQi<'(
TWO NORTH NINTH STREET, ALLENTOWN, PA.18101 PHONE: (215)821 5151 NORMAN W.CURTIS Vice President Engineerin8 IL Ccnstrtrcticn 821-5381 April 6, 1979 RECULATQi<'(Dxitg FiLE gopy.Mr.Boyce H.Grier Director, Region I U.S.Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 17406 SUSQUEiQuQlA STEAM ELECTRIC STATION FINAL REPORT OF UNDERSIZED WELDS ON SAFETY RELATED PIPE HANGERS DOCKET NOS: 50-387/50>>388 LICENSE NOS: CPPR-101/CPPR-102 ERs 100450/100508 FILE 840-4 PLA-343  
DxitgFiLEgopy.Mr.BoyceH.GrierDirector, RegionIU.S.NuclearRegulatory Commission 631ParkAvenueKingofPrussia,Pennsylvania 17406SUSQUEiQuQlA STEAMELECTRICSTATIONFINALREPORTOFUNDERSIZED WELDSONSAFETYRELATEDPIPEHANGERSDOCKETNOS:50-387/50>>388 LICENSENOS:CPPR-101/CPPR-102 ERs100450/100508 FILE840-4PLA-343


==DearMr.Grier:==
==Dear Mr.Grier:==
Thissupplements ourlettersPLA-202datedDecember1,1977,PLA-239datedApril6,1978,andPLA-316datedFebruary2,1979andrepresents thefinalreportrelativetothesubjectdeficiency whichwasreportedundertheprovisions of10CFR50.55(e).
This supplements our letters PLA-202 dated December 1, 1977, PLA-239 dated April 6, 1978, and PLA-316 dated February 2, 1979 and represents the final report relative to the subject deficiency which was reported under the provisions of 10CFR50.55(e).
Thedeficiency involveddimensionally undersized weldsonsafetyrelatedpipehangersfabricated fortheSusquehanna SteamElectricStationbyITTGrinnell, Warren,Ohioundex'echtel PurchaseOrder8856-P-3.
The deficiency involved dimensionally undersized welds on safety related pipe hangers fabricated for the Susquehanna Steam Electric Station by ITT Grinnell, Warren, Ohio undex'echtel Purchase Order 8856-P-3.The nonconforming conditions represented a deviation from hanger detailed design drawings and required an extensive evaluation of the"as-fabricated" undersized welds.Investigation of the problem revealed that the problem resulted, in part, from the fact that the specification for shop fabrication of hangers (8856-M-209) lacked specific criteria for the acceptance/refection of welds.This situation was corrected when, on October 18, 1977, Revision 11 of P.O.8856-P-3 was transmitted to the supplier and pxovided a revised Specification 8856-M-.209 which included appropx'iate inspection acceptance criteria.Having established the necessary inspection criteria for future production of pipe hangers, an extensive reinspection program for all hangers produced by ITT Grinnell prior to October 18, 1977 was instituted by Bechtel OC at the SSES construction site on December 1, 1977 and was devised to prevent the'b's g PENNSYLVANIA POWER 8 LIGHT COMPANY<90~%gN~g Mr.Boyce H.Grier April 6, 1979 installation of nonconforming hangers;to verify the supplier's compliance to the new fabrication and inspection requirements; and to provide orderly controls for continuing construction installation activities.
Thenonconforming conditions represented adeviation fromhangerdetaileddesigndrawingsandrequiredanextensive evaluation ofthe"as-fabricated" undersized welds.Investigation oftheproblemrevealedthattheproblemresulted, inpart,fromthefactthatthespecification forshopfabrication ofhangers(8856-M-209) lackedspecificcriteriafortheacceptance/refection ofwelds.Thissituation wascorrected when,onOctober18,1977,Revision11ofP.O.8856-P-3wastransmitted tothesupplierandpxovidedarevisedSpecification 8856-M-.209 whichincludedappropx'iate inspection acceptance criteria.
Visual inspections by Bechtel QC confirmed the acceptability of all Q-listed hangers shipped by ITT Grinnell after 10/18/77.On December 12, 1977, the Bechtel inspection effort was directed towards all hangers at SSES which had been fabricated prior to the October 18, 1977 date.All welds on pipe supports and hanger components were examined by Bechtel in accordance with Article 9 of ASME B&PV Code Section V-1971 and the following ANSI Standard B31.1 visual acceptance criteria:~Unacceptable indications (1)Cracks-external surface.(2)Undercut on surface which is greater than 1/32 inch deep.(3)Weld reinforcement greater than that specified in a table in Para.127.4.2 of the ANSI B31.1 Standard.(4)Lack of fusion on surface.(5)Incomplete penetration (applies only when inside surface is readily accessible).
Havingestablished thenecessary inspection criteriaforfutureproduction ofpipehangers,anextensive reinspection programforallhangersproducedbyITTGrinnellpriortoOctober18,1977wasinstituted byBechtelOCattheSSESconstruction siteonDecember1,1977andwasdevisedtopreventthe'b'sgPENNSYLVANIA POWER8LIGHTCOMPANY<90~%gN~g Mr.BoyceH.GrierApril6,1979installation ofnonconforming hangers;toverifythesupplier's compliance tothenewfabrication andinspection requirements; andtoprovideorderlycontrolsforcontinuing construction installation activities.
~Fillet weld minimum dimensions as specified in ANSI B31.1-1973.
Visualinspections byBechtelQCconfirmed theacceptability ofallQ-listedhangersshippedbyITTGrinnellafter10/18/77.
As necessary, during the Bechtel inspection effort, which was undertaken on 12/12/77 and concluded on 3/15/78, welds which did not meet specification requirements were reworked.On March 15, 1978 Bechtel QC concluded the primary inspection function and ITT-Grinnell quality'ontrol personnel assumed the inspection function on-site employing the same (Bechtel)visual inspection acceptance criteria.Prior to initiating the inspections, Grinnell's QC Program was submitted to and approved by Bechtel Engineering.
OnDecember12,1977,theBechtelinspection effortwasdirectedtowardsallhangersatSSESwhichhadbeenfabricated priortotheOctober18,1977date.Allweldsonpipesupportsandhangercomponents wereexaminedbyBechtelinaccordance withArticle9ofASMEB&PVCodeSectionV-1971andthefollowing ANSIStandardB31.1visualacceptance criteria:
At the outset of ITT-Grinnell's inspection effort, Bechtel QC held a preparatory meeting with ITT-Grinnell and established Bechtel QC surveillances, reviews and witness and hold points.(Bechtel QC documents its activities on Field Inspection Reports which are prepared weekly.)There is a computer listing of pipe hangers which has been modified to provide a record of all the safety-related pipe hangers affected.The listing provides columns designating the hangers which, as determined by the Bechtel survey, have been judged acceptable or have been designated as requiring rework.These records have been updated to reflect where rework'as accomplished and the status of the acceptability of the welds affected.These records reflect the interim (12/1/77 to 3/15/78)Bechtel inspection and rework effort.
~Unacceptable indications (1)Cracks-externalsurface.(2)Undercutonsurfacewhichisgreaterthan1/32inchdeep.(3)Weldreinforcement greaterthanthatspecified inatableinPara.127.4.2oftheANSIB31.1Standard.
Mr.Boyce H.Grier April 6, 1979 Records of ITT-Grinnell's activities are maintained in accordance with its QC Program.The records of Bechtel and ITT-Grinnell inspections are being kept as separate documents.
(4)Lackoffusiononsurface.(5)Incomplete penetration (appliesonlywheninsidesurfaceisreadilyaccessible).
Both sets of records contain similar pertinent information.
~Filletweldminimumdimensions asspecified inANSIB31.1-1973.
In conjunction with its inspection effort, ITT-Grinnell prepared the attached report of the results.and an analysis to verify the adequacy of the Susquehanna Project's hangers which were fabricated by ITT Grinnell in the fulfillment of Bechtel Purchase Order i/8856-P-3-AC Rev.12.This report has been reviewed and accepted by Bechtel Engineering who have stated: "In summary the conclusions of the report substantiate the adequacy of the Q-Listed hangers in question because: (a)All Q-Listed hangers shipped prior to 10/18/77 were inspected for undersized welds as well as for compliance with the revised specification requirements for visual weld acceptance criteria.(b)All Q-Listed hangers with undersized welds were analyzed in the"as-fabricated" condition to determine stress levels of the undersized welds.(c)None of the Q-Listed hangers with undersized welds were found to have weld stresses that exceeded the agreed upon allowables.(d)The ITTWrinnell analysis of the undersized welds in the Q-Listed hangers has demonstrated that this condition does not present a safety hazard because none of the welds were over-stressed." Presently, hangers in fabrication at the supplier's plant~being produced in accordance with Bechtel Specification 8856-M-209, Rev.7, are of acceptable quality.We therefore conclude that additional corrective measures to preclude recurrence are not necessary.
Asnecessary, duringtheBechtelinspection effort,whichwasundertaken on12/12/77andconcluded on3/15/78,weldswhichdidnotmeetspecification requirements werereworked.
Very truly yours, N.W.Curtis Vice President-Engineering
OnMarch15,1978BechtelQCconcluded theprimaryinspection functionandITT-Grinnell quality'ontrol personnel assumedtheinspection functionon-siteemploying thesame(Bechtel) visualinspection acceptance criteria.
&Construction ARS:mcb cc: Mr.J.G.Davis (15)Acting Director-Office of Inspection
Priortoinitiating theinspections, Grinnell's QCProgramwassubmitted toandapprovedbyBechtelEngineering.
&Enforcement U.S.Nuclear Regulatory Commission Washington, D.C.20555 Mr.G.McDonald, Director (1)Office of Management Information
AttheoutsetofITT-Grinnell's inspection effort,BechtelQCheldapreparatory meetingwithITT-Grinnell andestablished BechtelQCsurveillances, reviewsandwitnessandholdpoints.(BechtelQCdocuments itsactivities onFieldInspection Reportswhicharepreparedweekly.)Thereisacomputerlistingofpipehangerswhichhasbeenmodifiedtoprovidearecordofallthesafety-related pipehangersaffected.
&Program Control U.S.Nuclear Regulatory Commission Washington, D.C.20555 Mr.Robert M.Gallo U.S.Nuclear Regulatory Commission P.O.Box 52 Shickshinny; PA 18655}}
Thelistingprovidescolumnsdesignating thehangerswhich,asdetermined bytheBechtelsurvey,havebeenjudgedacceptable orhavebeendesignated asrequiring rework.Theserecordshavebeenupdatedtoreflectwhererework'as accomplished andthestatusoftheacceptability oftheweldsaffected.
Theserecordsreflecttheinterim(12/1/77to3/15/78)Bechtelinspection andreworkeffort.
Mr.BoyceH.GrierApril6,1979RecordsofITT-Grinnell's activities aremaintained inaccordance withitsQCProgram.TherecordsofBechtelandITT-Grinnell inspections arebeingkeptasseparatedocuments.
Bothsetsofrecordscontainsimilarpertinent information.
Inconjunction withitsinspection effort,ITT-Grinnell preparedtheattachedreportoftheresults.andananalysistoverifytheadequacyoftheSusquehanna Project's hangerswhichwerefabricated byITTGrinnellinthefulfillment ofBechtelPurchaseOrderi/8856-P-3-AC Rev.12.ThisreporthasbeenreviewedandacceptedbyBechtelEngineering whohavestated:"Insummarytheconclusions ofthereportsubstantiate theadequacyoftheQ-Listedhangersinquestionbecause:(a)AllQ-Listedhangersshippedpriorto10/18/77wereinspected forundersized weldsaswellasforcompliance withtherevisedspecification requirements forvisualweldacceptance criteria.
(b)AllQ-Listedhangerswithundersized weldswereanalyzedinthe"as-fabricated" condition todetermine stresslevelsoftheundersized welds.(c)NoneoftheQ-Listedhangerswithundersized weldswerefoundtohaveweldstressesthatexceededtheagreeduponallowables.
(d)TheITTWrinnell analysisoftheundersized weldsintheQ-Listedhangershasdemonstrated thatthiscondition doesnotpresentasafetyhazardbecausenoneoftheweldswereover-stressed."
Presently, hangersinfabrication atthesupplier's plant~beingproducedinaccordance withBechtelSpecification 8856-M-209, Rev.7,areofacceptable quality.Wetherefore concludethatadditional corrective measurestoprecluderecurrence arenotnecessary.
Verytrulyyours,N.W.CurtisVicePresident-Engineering
&Construction ARS:mcbcc:Mr.J.G.Davis(15)ActingDirector-Office ofInspection
&Enforcement U.S.NuclearRegulatory Commission Washington, D.C.20555Mr.G.McDonald, Director(1)OfficeofManagement Information
&ProgramControlU.S.NuclearRegulatory Commission Washington, D.C.20555Mr.RobertM.GalloU.S.NuclearRegulatory Commission P.O.Box52Shickshinny; PA18655}}

Revision as of 03:10, 6 July 2018

Forwards Final Rept of Undersized Welds on safety-related Pipe Hangers
ML18031A162
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 04/06/1979
From: CURTIS N W
PENNSYLVANIA POWER & LIGHT CO.
To: GRIER B H
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17138A569 List:
References
NUDOCS 7904120263
Download: ML18031A162 (5)


Text

.0 REGULA TORY liVFORMA TION D I STHIOUTION SYSTEM (R IPS)ACCESSION IVBRo 7904120263 DOC~DA I'E o 79/04/06 NOTARIZED<NO DOCKET FAG IL:50 387 SUSQUEHANNA STEAM ELECTRIC S TATION UiVIT 1 PEtVNSYLVA 050003 50-388 SUSQUE<AiutuA STEAM ELECTRIC STATION UNIT 2 PENNSYLVA 0500 8 AUTH~NAtlF AUTHOR AFF IL I A SION C U R T I S F N~'TBT'PFNiNS YL V AN I A POWER tt L IGH T CO~HECIP,iVAME HECIP IENT AFFILIATION GRIEH FB~H~REGION 1 PHILADELPHIA OFFICE OF THE DIRECTOR

SUBJECT:

FORWARDS FlNAL HEPT Uf: UNDERSIZED

'r'ELDS ON SAFETY RELATED PIPE HANGFHS~8, g 0-s8'7 DISTRIBUTION COOK: BDINS COPIES RE E IVES:L f ENCL J SIZE: 5+~~TITLE: CONSTRUCTION DEFICIENCY REPORT (IOCFN50~555)~NOTES:+~D 5+~>~Cg F5'Rlt'&TOTS~RECIPIENT IO CODE/NAME AC T ION: 14 Ptl H<p46fZ.20 LA C EE)g INTERNAL: 0 05 IHE 08 tlP A 10 QAB 12 JDROANt E/IE 16 AO FOR ENGR 17 AO REAC SFTY 22 DIR DPM EXTERNAL: 03 LPOR 24 ACRS COPIES LTTH ENCL 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 16 lb REC IP IENr ID CODE/NAME 15 BC tF@le g AD<MMc.c O 02 NHC PDR 07 EOO 8 STAFF 09 OEPY OIR DPM 11 STANORDS OFV 13F IELD COOR/IE 17 AO PLANT SYS 19 AD SYS/PROJ 23 OELD 04 NSIC COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1<PR 18 1ggg TOTAL IVUMt3ER OF COP IES REQUIRED: LTTR 39 ENCL 39

TWO NORTH NINTH STREET, ALLENTOWN, PA.18101 PHONE: (215)821 5151 NORMAN W.CURTIS Vice President Engineerin8 IL Ccnstrtrcticn 821-5381 April 6, 1979 RECULATQi<'(Dxitg FiLE gopy.Mr.Boyce H.Grier Director, Region I U.S.Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 17406 SUSQUEiQuQlA STEAM ELECTRIC STATION FINAL REPORT OF UNDERSIZED WELDS ON SAFETY RELATED PIPE HANGERS DOCKET NOS: 50-387/50>>388 LICENSE NOS: CPPR-101/CPPR-102 ERs 100450/100508 FILE 840-4 PLA-343

Dear Mr.Grier:

This supplements our letters PLA-202 dated December 1, 1977, PLA-239 dated April 6, 1978, and PLA-316 dated February 2, 1979 and represents the final report relative to the subject deficiency which was reported under the provisions of 10CFR50.55(e).

The deficiency involved dimensionally undersized welds on safety related pipe hangers fabricated for the Susquehanna Steam Electric Station by ITT Grinnell, Warren, Ohio undex'echtel Purchase Order 8856-P-3.The nonconforming conditions represented a deviation from hanger detailed design drawings and required an extensive evaluation of the"as-fabricated" undersized welds.Investigation of the problem revealed that the problem resulted, in part, from the fact that the specification for shop fabrication of hangers (8856-M-209) lacked specific criteria for the acceptance/refection of welds.This situation was corrected when, on October 18, 1977, Revision 11 of P.O.8856-P-3 was transmitted to the supplier and pxovided a revised Specification 8856-M-.209 which included appropx'iate inspection acceptance criteria.Having established the necessary inspection criteria for future production of pipe hangers, an extensive reinspection program for all hangers produced by ITT Grinnell prior to October 18, 1977 was instituted by Bechtel OC at the SSES construction site on December 1, 1977 and was devised to prevent the'b's g PENNSYLVANIA POWER 8 LIGHT COMPANY<90~%gN~g Mr.Boyce H.Grier April 6, 1979 installation of nonconforming hangers;to verify the supplier's compliance to the new fabrication and inspection requirements; and to provide orderly controls for continuing construction installation activities.

Visual inspections by Bechtel QC confirmed the acceptability of all Q-listed hangers shipped by ITT Grinnell after 10/18/77.On December 12, 1977, the Bechtel inspection effort was directed towards all hangers at SSES which had been fabricated prior to the October 18, 1977 date.All welds on pipe supports and hanger components were examined by Bechtel in accordance with Article 9 of ASME B&PV Code Section V-1971 and the following ANSI Standard B31.1 visual acceptance criteria:~Unacceptable indications (1)Cracks-external surface.(2)Undercut on surface which is greater than 1/32 inch deep.(3)Weld reinforcement greater than that specified in a table in Para.127.4.2 of the ANSI B31.1 Standard.(4)Lack of fusion on surface.(5)Incomplete penetration (applies only when inside surface is readily accessible).

~Fillet weld minimum dimensions as specified in ANSI B31.1-1973.

As necessary, during the Bechtel inspection effort, which was undertaken on 12/12/77 and concluded on 3/15/78, welds which did not meet specification requirements were reworked.On March 15, 1978 Bechtel QC concluded the primary inspection function and ITT-Grinnell quality'ontrol personnel assumed the inspection function on-site employing the same (Bechtel)visual inspection acceptance criteria.Prior to initiating the inspections, Grinnell's QC Program was submitted to and approved by Bechtel Engineering.

At the outset of ITT-Grinnell's inspection effort, Bechtel QC held a preparatory meeting with ITT-Grinnell and established Bechtel QC surveillances, reviews and witness and hold points.(Bechtel QC documents its activities on Field Inspection Reports which are prepared weekly.)There is a computer listing of pipe hangers which has been modified to provide a record of all the safety-related pipe hangers affected.The listing provides columns designating the hangers which, as determined by the Bechtel survey, have been judged acceptable or have been designated as requiring rework.These records have been updated to reflect where rework'as accomplished and the status of the acceptability of the welds affected.These records reflect the interim (12/1/77 to 3/15/78)Bechtel inspection and rework effort.

Mr.Boyce H.Grier April 6, 1979 Records of ITT-Grinnell's activities are maintained in accordance with its QC Program.The records of Bechtel and ITT-Grinnell inspections are being kept as separate documents.

Both sets of records contain similar pertinent information.

In conjunction with its inspection effort, ITT-Grinnell prepared the attached report of the results.and an analysis to verify the adequacy of the Susquehanna Project's hangers which were fabricated by ITT Grinnell in the fulfillment of Bechtel Purchase Order i/8856-P-3-AC Rev.12.This report has been reviewed and accepted by Bechtel Engineering who have stated: "In summary the conclusions of the report substantiate the adequacy of the Q-Listed hangers in question because: (a)All Q-Listed hangers shipped prior to 10/18/77 were inspected for undersized welds as well as for compliance with the revised specification requirements for visual weld acceptance criteria.(b)All Q-Listed hangers with undersized welds were analyzed in the"as-fabricated" condition to determine stress levels of the undersized welds.(c)None of the Q-Listed hangers with undersized welds were found to have weld stresses that exceeded the agreed upon allowables.(d)The ITTWrinnell analysis of the undersized welds in the Q-Listed hangers has demonstrated that this condition does not present a safety hazard because none of the welds were over-stressed." Presently, hangers in fabrication at the supplier's plant~being produced in accordance with Bechtel Specification 8856-M-209, Rev.7, are of acceptable quality.We therefore conclude that additional corrective measures to preclude recurrence are not necessary.

Very truly yours, N.W.Curtis Vice President-Engineering

&Construction ARS:mcb cc: Mr.J.G.Davis (15)Acting Director-Office of Inspection

&Enforcement U.S.Nuclear Regulatory Commission Washington, D.C.20555 Mr.G.McDonald, Director (1)Office of Management Information

&Program Control U.S.Nuclear Regulatory Commission Washington, D.C.20555 Mr.Robert M.Gallo U.S.Nuclear Regulatory Commission P.O.Box 52 Shickshinny; PA 18655