ML24346A197
| ML24346A197 | |
| Person / Time | |
|---|---|
| Site: | 05200050 |
| Issue date: | 12/11/2024 |
| From: | NuScale |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML24346A130 | List:
|
| References | |
| LO-175762 | |
| Download: ML24346A197 (1) | |
Text
Response to NuScale Technical Report Audit Question Question Number: A-4.FuelCR.TeR-10 Receipt Date: 04/29/2024 Question:
[
] Explain the basis for using different definitions of margin for fuel rod and non-fuel rod components, and clarify or correct the definition of margin for fuel rod components below Table 4-8 of TR-117605-P.
Response
There are two separate equations for margin listed below Table 4-9 in TR-117605-P, Revision 0, NuFuel-HTP2'Fuel and Control Rod Assembly Designs. [
]
NuScale Nonproprietary NuScale Nonproprietary
[
]
Both equations identified in the notes below Table 4-9 of TR-117605-P are acceptable for reporting margin because context is provided to what the margins represent.
[
] This issue is being tracked within Framatomes and NuScales corrective action programs. A markup correcting Table 4-9 in TR-117605-P is included with this response.
Markups of the affected changes, as described in the response, are provided below:
NuScale Nonproprietary NuScale Nonproprietary
NuFuel-HTP2' Fuel and Control Rod Assembly Designs TR-117605-NP Draft Revision 1
© Copyright 2024 by NuScale Power, LLC 59 Audit Question A-4.FuelCR.TeR-10 4.4 Thermal Hydraulic Evaluation 4.4.1 Core Pressure Drop Evaluation An evaluation is performed of the fuel assembly pressure drop characteristics. The total pressure drop, including the recoverable and unrecoverable constituents, is determined for the limiting fuel assembly in the reactor core for rated core power and system flow conditions. Pressure loss coefficients based on testing are reported in Table 5-1 and are used in the evaluation.
The results of the pressure drop analysis indicate that the total pressure drop is dominated by the recoverable loss because of elevation change. For the full power case, the channel with the largest pressure drop has an elevation loss that is approximately ((2(a),(c),ECI percent of the total pressure drop. The overall core total pressure drop for rated power conditions is (( }}2(a),(c),ECI Figure 4-8 shows the total pressure drop axial profile for the limiting assembly in the core. As observed in the figure, the elevation pressure drop is gradual and linear between each grid or nozzle while the component pressure loss increases the Table 4-9 Component Evaluation Margins [ ]}}