Abstract
It is physical to consider epithermal resonance up-scattering in light water reactor physics analysis. Although epithermal up-scattering improves the fuel temperature coefficient, it has a negative impact on reactivity. New ENDF/B-VII.1 and VIII.0 AMPX 61-group libraries for the Polaris lattice physics code within the SCALE-7.0 code system were developed to include 238U resonance data with and without accounting for epithermal resonance up-scattering. To assess the impact of epithermal resonance up-scattering, full core benchmark calculations were performed using the SCALE/Polaris–PARCS code procedure with the ENDF/B-VII.1 AMPX 61-group library for models of Watts Bar Unit 1 cycles 1–3 and Peach Bottom Unit 2 cycles 1–3. These models were previously developed for the validation of the SCALE-6.3/Polaris–PARCS code procedure for LWR physics analysis. The benchmark results, with and without considering epithermal up-scattering were compared with each other and with the plant-measured data.
| Original language | English |
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| Title of host publication | Proceedings of Advances in Nuclear Fuel Management, ANFM 2025 |
| Publisher | American Nuclear Society |
| Pages | 679-687 |
| Number of pages | 9 |
| ISBN (Electronic) | 9780894482267 |
| DOIs | |
| State | Published - 2025 |
| Event | 2025 Advances in Nuclear Fuel Management, ANFM 2025 - Clearwater Beach, United States Duration: Jul 20 2025 → Jul 23 2025 |
Publication series
| Name | Proceedings of Advances in Nuclear Fuel Management, ANFM 2025 |
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Conference
| Conference | 2025 Advances in Nuclear Fuel Management, ANFM 2025 |
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| Country/Territory | United States |
| City | Clearwater Beach |
| Period | 07/20/25 → 07/23/25 |
Funding
This research was supported by the US Nuclear Regulatory Commission Office of Research.
Keywords
- Epithermal resonance up-scattering
- LWR
- PARCS
- SCALE/Polaris