ML24289A239

Errata Pages for WCAP-18830-NP

ML24289A239
Person / Time
Site:	Turkey Point, Westinghouse
Issue date:	10/15/2024
From:	Westinghouse
To:	Office of Nuclear Reactor Regulation
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ML24289A236	List: ML24289A237 ML24289A239
References
LTR-NRC-24-39 WCAP-18830-NP
Download: ML24289A239 (1)

Text

Westinghouse Non-Proprietary Class 3 LTR-NRC-24-39 Enclosure 2

Enclosure 2

Errata Pages for WCAP-18830-NP

(Non-Proprietary)

October 2024

(4 pages including this cover page)

Errata pages 4-30, 5-29, and B-6, Revision 1

Westinghouse Electric Company 1000 Westinghouse Drive Cranberry Township, PA 16066

© 2024 Westinghouse Electric Company LLC All Rights Reserved

• • • This record was final approved on 10/15/2024 16:22:10. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 4-30

4.2.5.1.13 Fission Gas Bias

A bias was generated by determining the reactivity impact of the importan t isotopes which may not be present in the active assembly region. This impact used Equation 4-4 (the tolerance case is the perturbed case) except the effect is treated as a bias. [

]a,c

4.2.5.1.14 Eccentric Fuel Assembly Positioning Bias

The fuel assemblies are assumed to be nominally located in the center of the storage rack cell; however, it is recognized that an assembly could in fact be located eccentrically within its storage cell. Reference 8 indicates that assembly eccentric positioning should be considered in racks without absorber panels on all four sides. Only the Cask Area Rack is crediting absorbers on all four sides therefore, in this analysis, an eccentric positioning bias is determined for Region I and II storage arrays.

To quantify the reactivity effects of eccentrically located fuel within a fuel storage cell, [

]a,c

4.2.5.1.16 Borated and Unborated Biases and Uncertainties

Reference 3 requires each SFP to have keff to be < 0.95 under borated conditions accounting for all applicable biases and uncertainties. [

]a,c WCAP-18830-NP September 2023 Revision 0

• • • This record was final approved on 10/15/2024 16:32:10. (This statement was added by the PRIME system upon its validation)

Westinghouse 1RQ Proprietary Class 5-29

5.7.2 Soluble Boron for Accident Conditions

In addition to maintaining keff not to exceed 0.95 during normal operations, soluble boron is used to offset the potential reactivity insertion events in the SFPs. A multiple assembly misload is a postulated accident where assemblies are misloaded in series due to a common cause. [

]a,c

Table 5-33 [ ]a,c a,c

The multiple misload accidents bounds all other accidents listed in Section 4.2.9.

5.7.3 Soluble Boron Requirements Summary

Table 5-34 data indicates that 2350 ppm of soluble boron is needed during the most limiting accident analyzed to ensure the Turkey Point Units 3 & 4 SFPs will be less than a k eff of 0.95 at a 95 percent probability with 95 percent confidence.

Table 5-34 [ ]a,c Condition Description Required Soluble Boron (ppm)

Normal Operations 550

[ ]a,c 2350

WCAP-18830-1 P September 2023 Revision 0

• • • This record was final approved on 10/15/2024 10:32:11. *** This record was final approved on 10/15/2024 16:22:10. ((This statement was added bThis statement was added byy the PRIME s the PRIME syystem upon its validationstem upon its validation))

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Uniform/Distributed YES

Nodalization YES SeealsoSection4.1.1

Section4.1.4describesannularfuelincriticality

Blanketsmodeled YES Yes.modelsismodeledassolid.

Tolerances/Uncertainties YES Section4.2.5

Fuelgeometry YES

Fuelrodpinpitch YES

FuelpelletOD YES

CladdingOD YES

Axialfuelposition NO Fuelconservativelyassumedatallsameaxialheight.

Fuelcontent YES

Enrichment YES

Density NO Uppertoleranceappliedexplicitly.

Assemblyinsertdimensionsandmaterials YES SeealsoSections3.4.3and4.2.3

Rackgeometry YES

Fluxtrapsize(width) NO Tolerancesgivenonrackpitchchangefluxtrapsize.

Rackcellpitch YES

Rackwallthickness YES

NeutronAbsorberDimensions YES SeealsoSections3.4.3and4.2.3

Rackinsertdimensionsandmaterials YES SeealsoSections3.4.3and4.2.3

Codevalidationuncertainty YES AppendixA

Usedindevelopingeachuncertaintyimpactasdescribed

YES inSection4.2.5(alsoverysmall,individualuncertainties

Criticalitycaseuncertainty notconsequentialasseparaterackupitem.)

DepletionUncertainty YES

BurnupUncertainty YES

Biases YES Section4.2.5

specificadditionalbiasbutdesignbasisfuelisa

DesignBasisFueldesign NO Noconservativemodel.

Codebias YES

Temperature YES

Eccentricfuelplacement YES

Incorethimbledepletioneffect NO Effectissmallandanalysisisoverallconservative.

NRCadministrativemargin YES 0.005asindicatedinrackupsandthroughout*.

Modelingsimplifications YES Section4.2.3

Identifiedanddescribed YES

10.0InterfaceAnalysis

Interfaceconfigurationsanalyzed YES Section4.2.8

• Except for the [ ]a,c. See section 5.7.2.

WCAP-18830-1 P September 2023 Revision 0

• • • This record was final approved on 10/15/2024 10:32:11. *** This record was final approved on 10/15/2024 16:22:10. ((This statement was added bThis statement was added byy the PRIME s the PRIME syystem upon its validationstem upon its validation))