ML23304A464

LLC Response to NRCs Request for Docketing of Resolved Audit Responses, Chapter 11, Response to Sdaa Question 11.1-2, Re Information Related to Source Terms

ML23304A464
Person / Time
Site:	05200050
Issue date:	10/31/2023
From:	NuScale
To:	Office of Nuclear Reactor Regulation
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Download: ML23304A464 (1)

Text

NuScaleNonproprietary

ResponsetoSDAAAuditQuestion

QuestionNumber:A-11.1-2

ReceiptDate:04/10/2023

Question:

InreviewofSDAASection11.1theNRCstaffseekstounderstandthedifferencesbetweenthe NuScaleSDAAandDCAsourceterminformationthatisprovidedintheSDAASection11.1 tablesandtechnicalreport.WhatmodifiedparametersarecausingtheSDAAsourceterm valuestobedifferentfromthepreviousDCAsourcetermvalues?

InreviewofSDAATable11.1-1,thestaffobservesthatsomeofthesourceterminformation wasscaledforpowerlevel,whileotherswerenot.Forexample,pleasedescribethedifferences fordeterminingKr-85,Kr-87,Xe-131m,Xe-135,Xe-138,I-129,Cs-134Cs-135m,Cs-136,Cs-137,Sr-90,Y-90,Tc-99,Rh-105,Sb-125,Te-125m,Ba-137m,C-14,andH-3sincethese radionuclidesappeartoscalefrommorethanjustpowerleveldifferences.

Response

TheChapter11sourcetermvaluesreflectseveralparametersthatchangedandareshownin Table11.1-2and11.1-3.ForTable11.1-1specifically,themaincontributorsarethechangein cyclelength,increaseinburnup,andthechangeinthermalpower.TheUS600designhasa 160MWthdesignwithatwoyearcyclelength,whereastheNuScaleStandardUS460Plant Designhasa250MWthdesignwitha1.5yearcyclelength.TheUS600designalsoevaluates amaximumof60GWd/MTU,whereastheNuScaleStandardUS460PlantDesignevaluatesup to62GWd/MTU.Additionally,theuraniummassperfuelassemblychanged.Therefore,the changesarenotnecessarilyscalablebythermalpower.

AsrequestedduringtheclarificationcallonApril18,2023,NuScalehasprovidedEC-101293, Revision1,FuelAssemblyActivityCalculation,forstaffreviewintheeRRlocation"SDAA Chapter11AuditResponseA-11.1-2."NuScaleletternumberLO-140095providesthe supportingfilesforstaffreview.

NuScaleNonproprietary NuScaleNonproprietary

NochangestotheSDAAarenecessary.

NuScaleNonproprietary