ML24289A239
| ML24289A239 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point, Westinghouse  |
| Issue date: | 10/15/2024 |
| From: | Westinghouse |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML24289A236 | List: |
| References | |
| LTR-NRC-24-39 WCAP-18830-NP | |
| Download: ML24289A239 (1) | |
Text
Westinghouse Non-Proprietary Class 3 LTR-NRC-24-39 Westinghouse Electric Company 1000 Westinghouse Drive Cranberry Township, PA 16066
© 2024 Westinghouse Electric Company LLC All Rights Reserved 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
- 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 important 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 1RQProprietary Class
5-29 WCAP-18830-1P September 2023 Revision 0 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 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 keff 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 a,c
- This record was final approved on 10/15/2024 10:32:11. (This statement was added by the PRIME system upon its validation)
- This record was final approved on 10/15/2024 16:22:10. (This statement was added by the PRIME system upon its validation)
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B-6 WCAP-18830-1P September 2023 Revision 0
Uniform/Distributed
YES
Nodalization
YES
SeealsoSection4.1.1
Blanketsmodeled
YES
Yes.Section4.1.4describesannularfuelincriticality
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
Criticalitycaseuncertainty
YES
Usedindevelopingeachuncertaintyimpactasdescribed
inSection4.2.5(alsoverysmall,individualuncertainties
notconsequentialasseparaterackupitem.)
DepletionUncertainty
YES
BurnupUncertainty
YES
Biases
YES
Section4.2.5
DesignBasisFueldesign
NO
Nospecificadditionalbiasbutdesignbasisfuelisa
conservativemodel.
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.
- This record was final approved on 10/15/2024 10:32:11. (This statement was added by the PRIME system upon its validation)
- This record was final approved on 10/15/2024 16:22:10. (This statement was added by the PRIME system upon its validation)