ML25069A659
| ML25069A659 | |
| Person / Time | |
|---|---|
| Site: | 05200050 |
| Issue date: | 03/10/2025 |
| From: | NuScale |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML25069A609 | List: |
| References | |
| LO-180139 | |
| Download: ML25069A659 (1) | |
Text
Response to NuScale Topical Report Audit Question Question Number: A-FSR.LTR-53 Receipt Date: 10/14/2024 Question:
Section 6.6.5, Neutron Source Assembly states, The same KENO V.a cases also conservatively assume that the NSA is not present in the fuel while in the FSRs. Thus, there is no limitation on the use of neutron source assemblies. This is presumbably tied to Section 6.2 Assumptions which states, [
] Since these are neutron sources and not inert items, it is not intuitively obvious that modeling the NSAs in the SFP is conservative. Justify not modeling the NSAs in the SFP.
Response
Section 8.6.4.4, Effect of Neutron Source Assemblies on Spent Fuel Pool Reactivity, in EC-139299, Revision 1, contains an analysis of the reactivity effect of storing a neutron source assembly in the spent fuel pool. [
] It is judged that any impact of keff would be small compared to the analysis provided in Section 8.6.4.4.
NuScale Nonproprietary NuScale Nonproprietary
An analysis performed with in-core detectors in the instrument tube of the fuel assembly is performed in Section 3 of Electric Power Research Institute Report 3002008197, Sensitivity Analyses for Spent Fuel Pool Criticality, Revision 1, The analysis demonstrates that the reactivity effect due to a single in-core detector in an instrument tube is less than 0.0010 k.
No changes to the LTR are necessary NuScale Nonproprietary NuScale Nonproprietary