ML24215A060

LLC, Response to SDAA Audit Question Number A-3.9.2-21

ML24215A060
Person / Time
Site:	05200050
Issue date:	08/02/2024
From:	NuScale
To:	Office of Nuclear Reactor Regulation
Shared Package
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Download: ML24215A060 (1)

Text

Response to SDAA Audit Question Question Number: A-3.9.2-21 Receipt Date: 10/09/2023 Question:

"Since preliminary stress evaluations of the NuScale power module (NPM)-20 reactor vessel internals (RVI) and steam generator (SG) under seismic and transient loading conditions are not available for evaluation (current estimated availability date for the first set of calculations is

(( 2(a),(d),ECI the staff is evaluating the relative strengths of the dynamic loads on the RVI and SG of the NPM-160 for design certification and NPM-20 for standard design approval based on: (( }} 2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

(( }} 2(a),(c),ECI "

Response

Item 1: Details of the in-structure response spectra (ISRS) calculations for the NPM-160 are addressed in the approved US600 Design Certification Application (DCA). NuScale is not providing such details as part of this audit question response as the US460 Standard Design Approval Application (SDAA) is a stand alone application. The requested ISRS information for the NPM-20 is provided below. ((

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

TR-121515, Revision 0, US460 NuScale Power Module Seismic Analysis Figure ((

}}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Figure 1: (( }}2(a),(c),ECI NuScale Nonproprietary NuScale Nonproprietary

Figure 2: (( }}2(a),(c),ECI TR-121517, Revision 0, NuScale Power Module Short-Term Transient Analysis has been updated under Audit Question A-3.9.2-23 with updated RVI maximum forces and moments from EC-113758, Revision 1 NPM-20 Depressurization Calculation. EC-113758, Revision 1 is provided in the eRR. Item 2: Hanger plate braces were part of the design at the time of issuance of TR-121515, Revision 0. Hence, the NPM-20 transient loading analysis included hanger braces, Figure 3 ((

}}2(a),(c),ECI The resulting transient loading should be comparable.

NuScale Nonproprietary NuScale Nonproprietary

Figure 3: (( }}2(a),(c),ECI EC-107251, Revision 1, NPM-20 Seismic Simulation is provided in the eRR. NuScale Nonproprietary NuScale Nonproprietary}}