MHI's Responses To US-APWR DCD RAI 250-2143 Revision 1.

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nchFlanqesValves (Globe, Gate, Check)FlanqesValves (Globe, Gate, Check)10.3.6-2B60

Feedwater PipingSegmentMaterial specificationFeedwater pump outlet to feedwaterpump discharge equalization pipingFeedwater pump dischargeequalization pipingFeedwater pump dischargeequalization piping tofeedwater heaters 6/7Feedwater heaters 6/7 outlet tofeedwater heater 7 dischargeequalization pipingFeedwater heater 7 dischargeequalization pipingFittingsFlangesValves (Globe, Gate, Check)ASTM A-672 Grade. B60NominalOD22 inchASTM A-672 Grade-. B6036 inchASTM A-672 Grade-. B6026 inchASTM A-672 Grade-. B6026 inchASTM A-672 Grade, B6036 inchASTM A-105ASTM A-105ASTM A-1 81 Grade 70, orASTM A-216 Grade WCB.Class 90022 inch, 26inch & 36inchSA-335T Grade P2218 inchA-182 Grade F22, A-336Grade F22 or A-335 GradeP22A-182 Grade F22SA-1 82 or SA-217, GradeWC918 inchSA-335 Grade P22(Seamless)SA-335 Grade P22(Seamless)SA-182 Grade F22 orSA-336 Grade F22 orSA-335 Grade P22SA-182 Grade F22SA-182 or SA-217 GradeWC918 inchSection Ill, Class 316 inchSection III, Class 216 inch &18 inchNote: MaterialSpec. for fittings,flanges and valvesis same betweenASME Section IllClass 2 and 3.Feedwater heater 7 dischargeE equalization piping toMFIVmain/steam feedwater pipinqarea wallFittingsFlangesValves (Globe, Gate, Check)Main/steam feedwater piping area wallto MFIVMFIV to SGFittingsFlanesValves (Globe, Gate, Check)10.3.6-3ASME ClassB31.1B31.118 inch

Table 10.3.2-4 Main Steam Branch Piping Design Data (2.5-INCH AND LARGER)SegmentNominalOD6 inchASME Class6 inch &12 inchSection III, Class 3SA-333 Grade. 6 (Seamless)ASTM SA-106 Grade- A(Welded)SA4-06333 Grade- 86(Seamless)6 inch12 inch16 inch6 inchSection III Class 2Section III, Class 3SA-333. Grade 6 (Seamless)6 inchSection III, Class 3SA-1 05 or SA-333 Grade 6SA-1 05SA-216 Grade WCB, Class900 or SA-181 Grade 706 inch12 inch16 inchNote: MaterialSpec. for fittinqs,flanges and valvesis same betweenASME Section IIIClass 2 and 3.A-106 Grade A12 inchB31.1A-106 Grade A16 inchASTM A-1 05 or A 106 GradeAASTM A-105 (or equal),Class 150ASTM A-1 05, ASTM A-216,Grade WCB (or equal), Class15012 inch16 inchReheating steam to moistureseparator reheaterFittingsFlanqesValves (Globe, Gate, Check)ASTM A-387 Grade 2246 inchB31.1Moisture separator reheater steam toLP turbineFittingsFlangesASTM A-672 Grade- C6046 inchB31.1Main steam piping to MSRV/MSDVMSRV/MSDV discharge piping tomain steam/feedwater pipinq areawallMain steam piping to MSSVMSSV discharge piping to mainsteam/feedwater pipina area wallMain steam piping to turbine-drivenEFW pump turbine steam isolationvalveEFW pump turbine steam isolationvalve to turbine-driven EFW pumpsteam turbineFittinqsFlangesValves (Globe, Gate, Check)MSRV/MSDV discharge pipinaoutside main steam/feedwater pipingareaMSSV discharge piping outside mainsteam/ feedwater piping areaFittingsFlangesValves (Globe, Gate, Check)specificationSeMaterialnSA-406333- Grade- B6(Seamless)ASTM SA-106 Grade-. A -elded)ASTMASTMASTMA-217A-387A-1 82A-1 82GradeSection I11, Class 2Grade 22F22F22 or ASTMWC9, Class 900ASTM A-1 05ASTM A-1 81 Grade 70 orA-216 Grade WCB, Class900Valves (Globe, Gate, Check)Section III, Class 2ASTM A-216 Grade WCB,Class 900,10.3.6-4

Table 10.3.2-5 ASME Material Specifications with Filler Metal Specifications andClassificationASME MaterialSpecificationMat'lP #Mat'lGroup )A-333 Grade 6SA-672 Grade B60SA-335 Grade P22SA-182 F22SA-217 Grade WC9SA-508 Grade 1SA-352 Grade LCBSA-1 06 Grade BSA-106 Grade ASA-387 Grade 22SA-672 Grade C60SA-181 Grade 70SA-105606060Note 47070656048Note 5607070Filler Metal Note 1. 6. 7 8)GTAW 'Note 2)SMAW Note 3)Specification Classification Specification ClassificationAWS A5.18ER70S-XAWS A5.1E701XAWS A5.18ER70S-XAWS A5.1E701XAWS A5.28ER90S-B3AWS A5.5E901 X-B3AWS A5.28ER90S-B3AWS A5.5E901X-B3AWS A5.28ER90S-B3AWS A5.5E901 X-B3AWS A5.18ER7OS-XAWS A5.1E701XAWS A5.18ER70S-XAWS A5.1E701XAWS A5.18ER70S-XAWS A5.1E701 XAWS A5.18ER70S-XAWS A5.1E701XAWS A5.28ER90S-B3AWS A5.5E901 X-B3AWS A5.18ER70S-XAWS A5.1E701 XAWS A5.18ER70S-XAWS A5.1E701XAWS A5.18ER70S-XAWS A5.1E701XNotes:fnr C TAW nd MAW nnlv (th 1.Filler metal specifications and classifications wArp nivpn(th.S . Aan.rlv . e . fowermost likely welding processes). Filler metal information can be provided for other weldingprocesses if required.GTAW - Gas Tungsten Arc Welding process (Tiq)2.SMAW - Shielded Metal Arc Welding process (Stick)3.Class 1 has a tensile strenath of 60 ksi and Class 3 has a tensile strenath of 75 ksi.4.Class 1 has a tensile strength of 60 ksi and Class 2 has a tensile strength of 75 ksi.5.In some cases filler metal classifications contain an "X" in the classification number. The6.welding procedure specification would need to be consulted to determine the completeclassification number before ordering filler metal.ASTM and ASME material specifications both recognize the AWS filler metal specifications.7.However, ASME has adopted SFA as their own prefix for the AWS specification (i.e. AWSA5.18 becomes SFA-5.18).8.The filler metal specifications and classifications shown assume that the base metal isbeing joined to itself.Impact on COLAThere is no impact on the COLA.Impact on PRAThere is no impact on the PRA.10.3.6-5

RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION4/1/2009US-APWR Design CertificationMitsubishi Heavy IndustriesDocket No. 52-021RAI NO.:NO. 250-2143 REVISION 1SRP SECTION:APPUCATION SECTION:10.03.06 STEAM AND FEEDWATER SYSTEM MATERIALS10.3.6DATE OF RAI ISSUE: 3/2/2009QUESTION NO.: 10.03.06-2FSAR Tier 2, Section 10.3.6.2 states that the welding of low-alloy steel is implemented at preheattemperatures specified in Regulatory Guide 1.50, "Control of Preheat Temperature for Welding ofLow-Alloy Steel." The applicant further states that the preheat temperatures for carbon steelmaterials conform with Section III, Appendix D, Article D-1000, of the ASME Code. FSAR Table1.9.1-1 does not reference FSAR Section 10.3.6.2 in the line item for RG 1.50.The staff notes that RG 1.50 does not provide specified minimum preheat temperatures butprovides guidance on preheat control. In order to provide clarity, the staff requests that theapplicant modify FSAR Section 10.3.6.2 and Table 1.9.1-1 to clarify that welding of low-alloymaterials will conform to the guidance provided in RG 1.50 for the MSS and CFS. If the applicantdoes not intend to conform to the guidance in RG 1.50 for the MSS and CFS in its entirety, theapplicant should provide its alternative including a basis for its alternative. In addition, theapplicant should state, in Section 10.3.6.2, that the minimum preheat temperatures forcarbon-steel and low-alloy-steel materials conforms to the recommendations in ASME Code,Section III, Appendix D, Article D-1000.ANSWER:The descriptions and information in DCD 10.3.6.2 and Table 1.9.1-1 will be revised to incorporatethe staff requests and comments.Impact on DCDDCD 10.3.6.2 Material Selection and Fabrication, a new bullet will be added and new languagewill added in the fourth bullet as shown below, note the bullets presented in response to thisquestion also show changes that will come from another question later 10.03.06-4 and10.03.06-5:The material selection and fabrication methods used for Class 2 and 3 components conform tothe following:*In designing US-APWR, the material used for the piping and components of the CFS andthe MSS conform with Appendix I to Section III (Reference 10.3-12), Parts A (Reference10.3.6-6

10.3-13), Parts B (Reference 10.3-14), and Parts C (Reference 10.3-15) of Section II ofthe ASME Code Regulatory Guide 1.84 (Reference 10.3-16).SAusten e sta

sa-335 grade p22 5a 1 60 aws a5.28 er90s-b3 aws a5.5 e901 x-b3 sa-182 f22 5a 1 note 4 aws a5.28 er90s-b3 aws a5.5 e901x-b3 sa-217 grade wc9 5a 1 70 aws a5.28 er90s-b3 aws a5.5 e901 x-b3 sa-508 grade 1 1 2 70 aws a5.18 er7

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