ML24215A114

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LLC, Response to SDAA Audit Question Number A-5.4-3
ML24215A114
Person / Time
Site: 05200050
Issue date: 08/02/2024
From:
NuScale
To:
Office of Nuclear Reactor Regulation
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LO-169995
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Response to SDAA Audit Question Question Number: A-5.4-3 Receipt Date: 09/15/2023 Question:

There appears to be some inconsistency in how the RCPB components and Class 1 and 2 components are identified in the SDAA. For example:

Section 5.2 states that the RCPB includes the SG tubes, integral main steam baffle plate in the main steam tube sheet region, and integral steam plenum caps.

Table 5.2-3 includes the SG tubes, steam plenum caps, integral steam plenum bore sleeves, and covers for steam and feed plenum access ports.

Table 5.4-3 refers to Table 5.2-3 for the SG tubes, steam and feed plenum access ports, steam and feed plenum access port covers, and steam plenum caps.

Section 5.4.1.5 states that the SG tubes, integral steam plenum, integral steam plenum caps, feed plenum access ports, and feed plenum access port covers are Class 1 components.

Section 5.4.1.5 states that the FW and main steam piping from the containment system to the plenum nozzles, including the thermal relief valves; steam plenum access ports; and steam plenum access port covers are Class 2 components.

Please clearly define the SG system components that are part of the RCPB and clearly identify the SG system components that are Class 1 and Class 2.

Response

Standard Design Approval Application (SDAA) Section 5.2, Integrity of Reactor Coolant Boundary, includes a list of the reactor coolant pressure boundary (RCPB) components.

NuScale Nonproprietary NuScale Nonproprietary

Table 5.2-3, Reactor Coolant Pressure Boundary Component and Support Materials Including Reactor Vessel, Attachments, and Appurtenances, in the SDAA contains a comprehensive list of acceptable materials for use in the RCPB component and support materials, including the vessel, attachments, and appurtenances. There are items in Table 5.2-3 that are not in the list of RCPB components in Section 5.2, but all of the items in Section 5.2 are included in Table 5.2-3 with one exception and two nomenclature changes. The markups attached to this audit response note nomenclature changes in Section 5.2 (pressurizer (PZR) heater bundle covers changed to PZR heater assembly and in-core instrumentation covers changed to instrument seal assemblies). The materials for the instrument seal assemblies are not in SDAA; this is an unintentional omission tracked in condition report (CR) 152875. The materials for the instrument seal assemblies will be provided in a markup to SDAA when CR 152875 is resolved.

Table 5.4-3, Steam Generator System Component Materials, in the SDAA contains a comprehensive list of acceptable materials for use in the SGS components. Table 5.4-3 points to SDAA Table 5.2-3 for the steam generator tubes, steam plenum access port, steam plenum access port covers, steam plenum caps, feed plenum access port, and feed plenum access port covers. Table 5.2-3 includes all of these items; the steam plenum access port and the feed plenum access port are listed under Upper Vessel in Table 5.2-3.

Section 5.4.1.5 of the SDAA lists Class 1 and Class 2 components. There are no inconsistencies in the lists; the RCPB components are Class 1, and other components are Class 2 as noted. The steam plenum access ports and covers are Class 2 in accordance with Regulatory Guide 1.26 and are not part of the RCPB. Table 5.2-6, Classification of Structures, Systems, and Components, and Table 5.4-9, Classification of Structures, Systems and Components, are in SDAA, Revision 1; the markups attached to this audit response add the tables to SDAA Section 5.2 and Section 5.4.

Addendum There is an additional markup to SDAA attached to this response, which adds the materials for the ISAs and the electrical penetration assemblies (EPAs) to Chapter 5 and Chapter 6. The additional markup is the final four pages of this response package. This closes CR 152875 by notifying the NRC of the additional materials in SDAA.

Markups of the affected changes, as described in the response, are provided below:

NuScale Nonproprietary NuScale Nonproprietary

NuScale Final Safety Analysis Report Integrity of Reactor Coolant Boundary NuScale US460 SDAA 5.2-31 Draft Revision 1 Table 5.2-3: Reactor Coolant Pressure Boundary Component and Support Materials Including Reactor Vessel, Attachments, and Appurtenances Component Specification Grade, Class, or Type Reactor Pressure Vessel Lower Vessel (Lower Head, Shell and Flange)

SA-965 FXM-191 Upper Vessel (Flange, Shells including Integral Steam Plenum Baffle Plate, Upper Head, Steam Plenum and Feed Plenum Access Ports)

SA-508 Grade 3 Class 2 SG Tubes SB-163 UNS N06690 Nozzles (Thermowells, Level Sensors, Pressure Taps); Steam Plenum Caps SB-166 UNS N06690 CNV-RPV Lateral Support Lugs; RPV-CNV Support Ledges SB-168 UNS N06690 Safe-Ends SA-182 F3042 Integral Steam Plenum Bore Sleeves SA-240 Type 3042 Covers for Steam Plenum Access Ports Covers for Feed Plenum Access Ports SA-182 F3042 FXM-19 SA-240 Type 3042 FXM-191 Leak Test Ports SA-312 TP316 SMLS2 PZR Heater Bundle Flange SB-168 UNS N06690 PZR Heater Element End Plug SA-479 Type 3042 PZR Heater Element Sheath SA-213 TP3162 Threaded Inserts; Pipe Reducers; PZR Spray Nozzles SA-479 Type 3042 SA-193 Grade 8 Class 1 Grade B8M Class 1 Grade B8R Grade B8S Carbide Solution Treated RPV Bolting Main Flange Closure SB-637 UNS N077183 Other Than Main Flange Closure SA-193 Grade B8 Class 1, Grade B8R, Grade B8M Class 1 SA-194 Grade 8 SB-637 UNS N077183 SA-564 Type 630, H1100 CRDM Support Structure Supports SA-240 Type 3042 SA-479 Type 3042 Bolting SA-564 Type 630, H1100 CRDM Pressure Retaining Components CRDM Pressure Housing SA-182 F304 or F304LN2 SA-965 F304LN2 Top Plug Components SA-479 Type 3042 Type 410 Austenitic Stainless Steel Weld Filler Metals SFA-5.4 E3084, E308L, E309L, E316, E316L SFA-5.9 ER3084, ER308L, ER309L, ER316, ER316L4

NuScale Final Safety Analysis Report Integrity of Reactor Coolant Boundary NuScale US460 SDAA 5.2-36 Draft Revision 1 Table 5.2-6: Classification of Structures, Systems, and Components SSC (Note 1)

Location SSC Classification (A1, A2, B1, B2)

Augmented Design Requirements (Note 2)

Quality Group/Safety Classification (Ref RG 1.26 or RG 1.143)

(Note 3)

Seismic Classification (Ref. RG 1.29 or RG 1.143)

(Note 4)

RCS, Reactor Coolant System All components (except as listed below)-

RXB A2 None A

I

  • Wide range RCS pressure element
  • RCS cold temperature element
  • RCS hot temperature element
  • Narrow range PZR pressure element RXB A1 None A

I

  • RVI - lower riser assembly
  • RVI - core support assembly
  • RVI - upper riser assembly
  • RCS flow element
  • PZR level
  • RPV level RXB A1 None N/A I
  • RVI - NPM guide tube assemblies
  • RVI - core support mounting brackets RXB A2 None N/A I

RVI - RCS Injection line (internal to RPV)

RXB B2 None D

I

  • RVI - flow diverter
  • Reactor safety valve position indicator RXB B2 None N/A I
  • PZR control cabinet
  • PZR heater power cabling from MPS breaker to PZR heater
  • PZR spray nozzles (internal to RPV)

RXB B2 None N/A II PZR heater power cabling from ELV breaker to MPS breaker RXB B2 None N/A III Note 1: Acronyms used in this table are listed in Table 1.1-1 Note 2: Additional augmented design requirements, such as the application of a Quality Group, Radwaste safety, or seismic classification, to nonsafety-related SSC are reflected in the columns Quality Group / Safety Classification and Seismic Classification, where applicable. Environmental Qualification for SSC are identified in Table 3.11-1.

Note 3: See Section 3.2.2.1 through Section 3.2.2.4 for the applicable codes and standards for each RG 1.26 Quality Group designation (A, B, C, and D). A Quality Group classification per RG 1.26 is not applicable to supports or instrumentation that do not serve a pressure boundary function. See Section 3.2.1.4 for a description of RG 1.143 classification for RW-IIa, RW-IIb, and RW-IIc.

Note 4: Where SSC (or portions thereof) as determined in the as-built plant that are identified as Seismic Category III in this table could, as the result of a seismic event, adversely affect Seismic Category I SSC or result in incapacitating injury to occupants of the control room, they are categorized as Seismic Category II consistent with Section 3.2.1.2 and analyzed as described in Section 3.7.3.8.

NuScale Final Safety Analysis Report Reactor Coolant System Component and Subsystem Design NuScale US460 SDAA 5.4-38 Draft Revision 1 Table 5.4-3: Steam Generator System Component Materials Component Specification Alloy Designation (Grade, Class, or Type)

SGS Piping

  • SGS Main Steam Piping Assembly Pipe SA-312 TP304 SMLS, TP316 SMLS1 Pipe Fittings SA-182 F304, F316 1 SA-403 WP304 SMLS, WP316 SMLS 1 Pressure-Retaining Bolting SB-637 UNS N077182 Piping Supports Supports SA-240 Type 304, Type 3161 Type 405, Type 410S SA-479 Type 304, Type 3161 Type 405, Type 410 Annealed or Class 1 SA-312 TP304, TP304L, TP316, TP316L1 Bolting SA-193 Grade B8, Grade B8M SA-194 Grade 8, Grade 8M SA-564 Type 630 H1100 SG Supports SG Supports, SG Tube Supports SG Backing Strips SA-240 Type 304 Weld Filler Metals for Piping, Piping Supports, and SG Supports 3XX Austenitic Stainless Steel Weld Filler Metals SFA-5.4 E308, E308L, E316, E316L3 SFA-5.9 ER308, ER308L, ER316, ER316L3 SFA-5.22 E308, E308L, E309, E309L, E316, E316L 3,4 SFA-5.30 IN308, IN308L, IN316, IN316L3 Nickel-Base Alloy Weld Filler Metals SFA-5.11 ENiCrFe-7 SFA-5.14 ERNiCrFe-7, ERNiCrFe-7A, EQNiCrFe-7, EQNiCrFe-7A Inlet Flow Restrictor Components Flow Restrictor Flanged Sleeve SA-479 Type 304 Flow restrictor Hardware SA-479 Type 316 Flow Restrictor Collet SA-479 Type 304 Flow restrictor locking plate SA-240 Type 304 Other SG Components SG Tubes Steam Plenum Access Port Steam Plenum Access Port Covers Steam Plenum Caps Feed Plenum Access Port Feed Plenum Access Port Covers Table 5.2-3 Notes:

(1) 0.03% maximum carbon if unstabilized Type 3XX base metals are welded or exposed to temperature range of 800°F to 1500°F subsequent to final solution anneal.

(2) SB-637 UNS N07718 solution treatment temperature range before precipitation hardening treatment restricted to 1800°F to 1850°F.

(3) 0.03% maximum carbon for unstabilized AISI Type 3XX weld filler metals; ferrite number in the range of 5FN to 20FN, except 5FN to 16FN for Type 316 and Type 316L.

(4) Applicable to reactor vessel internalsSG support components only.

NuScale Final Safety Analysis Report Reactor Coolant System Component and Subsystem Design NuScale US460 SDAA 5.4-48 Draft Revision 1 Table 5.4-9: Classification of Structures, Systems, and Components SSC (Note 1)

Location SSC Classification (A1, A2, B1, B2)

Augmented Design Requirements (Note 2)

Quality Group/Safety Classification (Ref RG 1.26 or RG 1.143)

(Note 3)

Seismic Classification (Ref. RG 1.29 or RG 1.143)

(Note 4)

SGS, Steam Generator System All components (except as listed below)-

RXB A2 None B

I

  • Integral steam plenum and caps
  • Feed plenum access ports and covers

I

  • SG tube supports
  • Upper and lower SG supports
  • Flow restrictors RXB A2 None N/A I

DHRS, Decay Heat Removal System All components (except those listed below)-

RXB A2 None B

I SG steam pressure transmitter RXB A1 None B

I DHRS Valve stored energy device pressure transmitter (Note 6)

RXB A2 None N/A I

Actuation valve position indication RXB B2 IEEE 497-2016 (Note 5)

N/A I

Note 1: Acronyms used in this table are listed in Table 1.1-1 Note 2: Additional augmented design requirements, such as the application of a Quality Group, Radwaste safety, or seismic classification, to nonsafety-related SSC are reflected in the columns Quality Group / Safety Classification and Seismic Classification, where applicable. Environmental Qualifications for SSC are identified in Table 3.11-1.

Note 3: See Section 3.2.2.1 through Section 3.2.2.4 for the applicable codes and standards for each RG 1.26 Quality Group designation (A, B, C, and D). A Quality Group classification per RG 1.26 is not applicable to supports or instrumentation that do not serve a pressure boundary function. See Section 3.2.1.4 for a description of RG 1.143 classification for RW-IIa, RW-IIb, and RW-IIc.

Note 4: Where SSC (or portions thereof) as determined in the as-built plant that are identified as Seismic Category III in this table could, as the result of a seismic event, adversely affect Seismic Category I SSC or result in incapacitating injury to occupants of the control room, they are categorized as Seismic Category II consistent with Section 3.2.1.2 and analyzed as described in Section 3.7.3.8.

Note 5: IEEE Std 497-2016 as endorsed by RG 1.97 and implemented as described in Table 1.9-2 Note 6: Pressure transmitters not applicable to stored energy devices that do not use pressurized accumulators

NuScale Final Safety Analysis Report Integrity of Reactor Coolant Boundary NuScale US460 SDAA 5.2-1 Draft Revision 2 5.2 Integrity of Reactor Coolant Boundary The design features of each NuScale Power Module (NPM) maintain the integrity of the reactor coolant pressure boundary (RCPB) for the design life of the plant. The RCPB for the NPM meets the RCPB definition provided in 10 CFR 50.2 and includes the pressure retaining components that are part of the reactor coolant system (RCS) up to and including the outermost containment isolation valve (CIV) in system piping that penetrates the containment vessel (CNV).

the reactor safety valves (RSVs).

the emergency core cooling system (ECCS) reactor vent valves (RVVs) and reactor recirculation valves (RRVs).

The piping that is part of the NPM reactor coolant pressure boundary (RCPB) penetrates both the reactor pressure vessel (RPV) and the containment vessel (CNV) up to the outermost containment isolation valve (CIV). This piping does not terminate inside the CNV. The piping included in the RCPB is:

RCS discharge line piping and CNTS nozzle and safe end (interior and exterior)

RCS injection line piping and CNTS nozzle and safe end (interior and exterior)

Pressurizer (PZR) spray line piping and CNTS nozzle and safe end (interior and exterior)

RPV high point degasification line piping and CNTS nozzle and safe end (interior and exterior)

In addition to the RCPB piping, other portions of the RCPB include:

RPV heads and shells Sensors (UT sensor, thermowells, and pressure sensors)

Reactor Recirculation Valves SG tubes RCS discharge safe end RCS injection safe end (exterior)

Audit Question A-5.4-1 PZRIntegral main steam baffle plate in the main steam tube sheet region Integral steam plenum caps Audit Question A-5.4-3 PZR heater assemblybundle covers PZR spray safe ends RPV high point degasification safe end Audit Question A-5.4-3 Instrument seal assembliesIn-core instrumentation covers CRDM pressure housings

NuScale Final Safety Analysis Report Integrity of Reactor Coolant Boundary NuScale US460 SDAA 5.2-31 Draft Revision 2 Audit Question A-5.4-1, Audit Question A-5.4-3 Table 5.2-3: Reactor Coolant Pressure Boundary Component and Support Materials Including Reactor Vessel, Attachments, and Appurtenances Component Specification Grade, Class, or Type Reactor Pressure Vessel Lower Vessel (Lower Head, Shell and Flange)

SA-965 FXM-191 Upper Vessel (Flange, Shells including PZRIntegral Steam Plenum Baffle Plate, Upper Head, Steam Plenum and Feed Plenum Access Ports)

SA-508 Grade 3 Class 2 SG Tubes SB-163 UNS N06690 Nozzles (Thermowells, Level Sensors, Pressure Taps); Steam Plenum Caps SB-166 UNS N06690 CNV-RPV Lateral Support Lugs; RPV-CNV Support Ledges SB-168 UNS N06690 Safe-Ends SA-182 F3042 Integral Steam Plenum Bore Sleeves SA-240 Type 3042 Covers for Steam Plenum Access Ports Covers for Feed Plenum Access Ports SA-182 F3042 FXM-19 SA-240 Type 3042 FXM-191 Leak Test Ports SA-312 TP316 SMLS2 PZR Heater Bundle Flange SB-168 UNS N06690 PZR Heater Element End Plug SA-479 Type 3042 PZR Heater Element Sheath SA-213 TP3162 Threaded Inserts; Pipe Reducers; PZR Spray Nozzles SA-479 Type 3042 SA-193 Grade 8 Class 1 Grade B8M Class 1 Grade B8R Grade B8S Carbide Solution Treated Instrument Seal Assembly (ISA) Flange SA-240 Type 304, 304L, 316, 316L (Note 2)

ISA Fittings SA-479 Type 316, 316L (Note 2)

ISA Studs and Nuts SB-637 UNS N07718 (Note 3)

RPV Bolting Main Flange Closure SB-637 UNS N077183 Other Than Main Flange Closure SA-193 Grade B8 Class 1, Grade B8R, Grade B8M Class 1 SA-194 Grade 8 SB-637 UNS N077183 SA-564 Type 630, H1100 CRDM Support Structure Supports SA-240 Type 3042 SA-479 Type 3042 Bolting SA-564 Type 630, H1100 CRDM Pressure Retaining Components CRDM Pressure Housing SA-182 F304 or F304LN2 SA-965 F304LN2

NuScale Final Safety Analysis Report Integrity of Reactor Coolant Boundary NuScale US460 SDAA 5.2-33 Draft Revision 2 SGs Piping Table 5.4-3 Piping Supports Bolting SG Supports SG Tube Supports Backing Strips RCPB Valves RSVs Table 6.1-3 RVVs RRVs RCS Injection and Discharge line Isolation Valves RCS PZR Spray Line Isolation Valves RPV High Point Degasification Line Isolation Valves Notes:

(1) 0.04 percent maximum carbon for FXM-19 and Type 2XX weld filler metals. Ferrite number in the range of 5 FN to 16 FN.

(2) 0.03 percent maximum carbon for unstabilized AISI Type 3XX base metals if welded or exposed to temperature range of 800 degrees F to 1500 degrees F subsequent to final solution anneal.

(3) SB-637 UNS N07718 solution treatment temperature range before precipitation hardening treatment restricted to 1800 degrees F to 1850 degrees F. In addition, nuts are case-hardened to reduce galling.

(4) 0.03 percent maximum carbon for unstabilized AISI Type 3XX weld filler metals; ferrite number in the range of 5 FN to 20 FN, except 5 FN to 16 FN for Type 316 and Type 316L.

Table 5.2-3: Reactor Coolant Pressure Boundary Component and Support Materials Including Reactor Vessel, Attachments, and Appurtenances (Continued)

Component Specification Grade, Class, or Type

NuScale Final Safety Analysis Report Engineered Safety Feature Materials NuScale US460 SDAA 6.1-7 Draft Revision 2 Audit Question A-5.4-3 Table 6.1-1: Material Specifications for ESF Components Component Specification Grade/Type/Class Containment Vessel (CNV)

Lower Vessel Support Skirt SA-182 F304 (Note 1)

Lower Vessel (Lower Head, Core Region Shell, Transition Shell)

SA-965 FXM-19 (Note 2)

Lower Vessel (Flange, Lower Shell);

Upper Vessel (Flange, Shells, Upper Head, and Manway Nozzles)

Code Case N-774 (SA-336)

F6NM CNV Top Head Cover; Covers for CNV Manways and Access Ports SA-182 F6NM CNV Safe-Ends and Fittings SA-182 F304 and F316 (Note 1)

CNV Thermowells SA-479 Type 304 (Note 1)

CNV Seismic Support Lugs; CNV-RPV Supports (Gussets, Plates, and Lugs)

SB-168 UNS N06690 Leak Detection Ports SA-312 TP316L SMLS (Note 1)

CRDM Support Frame SA-240 Type 304 (Note 1)

SA-479 Type 304 (Note 1)

Electrical Penetration Assembly (EPA) Flange /

Instrument Seal Assembly (ISA) Flange SA-240 Type 304, 304L 316, 316L (Note 1)

SA-182 F6NM EPA Housing SA-312 TP304, TP 304L TP 316, TP 316L (Note 1)

SA-479 Type 304, 304L, 316, 316L (Note 1)

ISA Fittings SA-479 Type 316, 316L (Note 1)

EPA / ISA Studs and Nuts SB-637 UNS N07718 (Note 3)

CNV Bolting Main Flange Closure SB-637 UNS N07718 (Note 3)

Other Than Main Flange Closure SA-193 Grade B8 Class 1 SA-194 Grade 8 SA-564 Type 630, H1100 SB-637 UNS N07718 (Note 3)

CNV Top Support Structure Support SA-182 F6NM SA-240 Type 304 (Note 1)

SA-312 TP 304 (Note 1)

SA-479 Type 304 (Note 1)

Bolting SA-193 Grade B8 Class 1 SA-194 Grade 8 SA-564 Type 630, H1100 SB-637 UNS N07718 (Note 3)

Weld Filer Metals for CNV and CNV Top Support Structure 2XX Austenitic Stainless Steel Weld Filler Metals SFA-5.4 E209, E240 (Note 2)

SFA-5.9 ER209, ER240 (Note 2) 3XX Austenitic Stainless Steel Weld Filler Metals SFA-5.4 E308, E308L, E309, E309L, E316, E316L (Note 4)

SFA-5.9 ER308, ER308L, ER309, ER309L, ER316, ER316L (Note 4)

SFA-5.22 E308, E308L, E309, E309L, E316, E316L (Note 4) 4XX Materialistic Stainless Steel Weld Filler Metals SFA-5.4 E410NiMo SFA-5.9 ER410NiMo

NuScale Final Safety Analysis Report Engineered Safety Feature Materials NuScale US460 SDAA 6.1-8 Draft Revision 2 Nickel-Base Alloy Weld Filler Metals SFA-5.11 ENiCrFe-7 SFA-5.14 ERNiCrFe-7, ERNiCRFE-7A, EQNiCrFe-7, EQNiCrFe-7A Containment System (CNTS) Piping CNTS Chemical and Volume Control Injection Piping Assembly CNTS Chemical and Volume Control Discharge Piping Assembly CNTS Pressurizer Spray Piping Assembly CNTS Reactor Pressure Vessel High Point Degasification Piping Assembly Pipe SA-312 TP316 SMLS, TP304 SMLS (Note 1)

Pipe Fitting SA-182 F304, F316 (Note 1)

SA-403 WP304 SMLS, WP316 SMLS (Note 1)

Emergency Core Cooling System (ECCS) Piping Assembly Tube SA-213 TP316 (Note 1)

Tube Fitting SA-182 F316 (Note 1)

SA-479 Type 316, Type 316L (Note 1)

Note:

1) 0.03 percent maximum carbon if unstablized Type 3XX base metals are welded or exposed to temperature range of 800 °F to 1500 °F subsequent to final solution anneal.

2) 0.04 percent maximum carbon for FXM-19 and Type 2XX weld filler metals.

3)

SB-637 UNS N07718 solution treatment temperature of range before precipitation hardening treatment restricted to 1800 °F to 1850 °F. In addition nuts are case-hardened to reduce galling.

4) 0.03 percent maximum carbon for unstablized AISI Type 3XX weld filler metals; ferrite number in the range of 5FN to 20FN, except 5FN to 16FN for Type 316 and Type 316L.

Table 6.1-1: Material Specifications for ESF Components (Continued)

Component Specification Grade/Type/Class

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