ML24215A099

LLC, Response to SDAA Audit Question Number A-4.Fluence.TeR-6

ML24215A099
Person / Time
Site:	05200050
Issue date:	08/02/2024
From:	NuScale
To:	Office of Nuclear Reactor Regulation
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Download: ML24215A099 (1)

Text

Response to NuScale Technical Report Audit Question Question Number: A-4.Fluence.TeR-6 Receipt Date: 04/22/2024 Question:

(( 2(a),(c),ECI However, Table B-13 of TR-118976-P shows that the maximum fluence of RPV at the inner surface (( }} 2(a),(c),ECI. Revise the technical report TR-118976-P to reflect the maximum fluence (( }} 2(a),(c),ECI.

Response

The peak reactor pressure vessel beltline inner surface fluence of ((

}}2(a),(c),ECI (located in the electronic reading room as an attachment to the response to audit question A-4.3-5) is found in Table 5-1 of TR-118976-P, Revision 0.

Section B.1.14 and Table B-13 of TR-118976-P, Revision 0, provide a sensitivity case to estimate the uncertainty in the peak neutron fluence due to using a ((

}}2(a),(c),ECI tally subdivision size.

The maximum uncertainty in the peak neutron fluence values due to ((

}}2(a),(c),ECI in Table B-13 of TR-118976-P, Revision

0. Equation 4-5 of Section 4.3 of TR-118976-P, Revision 0, implements this uncertainty to quantify the overall uncertainty in the NuScale best-estimate fluence MCNP6 model.

Discussed in the response to A-4.Fluence.TeR-7, the sensitivity case to estimate the uncertainty for tally mesh size (angular tally subdivision size) ((

}}2(a),(c),ECI. The percent differences of Table B-13 are the relevant information in the table for the calculation of the overall uncertainty. The fluence and relative error values do not impact the fluence calculation methodology or results of TR-118976-P, Revision 0. NuScale has removed the fluence and relative error values from NuScale Nonproprietary NuScale Nonproprietary

Table B-13 to clarify the relevant information of the table. Changes to Table B-13 also include updates to the table title due to the response to audit question A-4.Fluence.TeR-7. NuScale also updated the text of Section B.1.14 to clarify the results of Table B-13 in response to audit question A-4.Fluence.TeR-7. Markups of the affected changes, as described in the response, are provided below: NuScale Nonproprietary NuScale Nonproprietary

Fluence Calculation Methodology and Results TR-118976-NP Draft Revision 1 © Copyright 2024 by NuScale Power, LLC B-24 B.1.14 Tally Mesh Size Audit Question A-4.Fluence.TeR-6, Audit Question A-4.Fluence.TeR-7 This section presents the results of the determination of the tally subdivision size uncertainty, Audit Question A-4.Fluence.TeR-6, Audit Question A-4.Fluence.TeR-7 (( Audit Question A-4.Fluence.TeR-6, Audit Question A-4.Fluence.TeR-7 Audit Question A-4.Fluence.TeR-6, Audit Question A-4.Fluence.TeR-7 }}2(a),(c) Audit Question A-4.Fluence.TeR-6, Audit Question A-4.Fluence.TeR-7 tally

Fluence Calculation Methodology and Results TR-118976-NP Draft Revision 1 © Copyright 2024 by NuScale Power, LLC B-25 Table B-13 Tally Subdivision Size UncertaintyPeak Fluence Results for Axially-Varied Coolant Density (( }}2(a),(c)}}