Abstract
This paper presents an upgrade to the built-in response matrix based solver implemented in Serpent 2 Monte Carlo code aiming to improve the fission source convergence when obtaining the forward solution to the k-eigenvalue criticality source problems. The functional expansion tallies are introduced in an attempt to improve the accuracy of the cell-wise form factors that feed the response matrix solver, replacing the current mesh-based approach. The functional expansion tallies reconstruct the binning surface and collision tallies, by using high-order series expansion to represent the original and continuous spatial distributions. This new feature is implemented to Serpent 2 and tested by single-assembly and full-core PWR calculations (BEAVRS benchmark). The results show enhanced performance of the convergence acceleration methodology based on an improved initial guess of the fission source.
Original language | English |
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Title of host publication | Proceedings of the International Conference on Physics of Reactors, PHYSOR 2020 |
Subtitle of host publication | Transition to Scalable Nuclear Energy |
Publisher | American Nuclear Society (ANS) |
Number of pages | 12 |
ISBN (Print) | 978-1-5272-6447-2 |
Publication status | Published - 2020 |
MoE publication type | A4 Article in a conference publication |
Event | International Conference on Physics of Reactors, PHYSOR 2020: Cancelled - Cambridge, United Kingdom Duration: 29 Mar 2020 → 2 Apr 2020 https://www.physor2020.com/ |
Conference
Conference | International Conference on Physics of Reactors, PHYSOR 2020 |
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Country | United Kingdom |
City | Cambridge |
Period | 29/03/20 → 2/04/20 |
Other | Cancelled |
Internet address |
Keywords
- Kraken
- SMR
- shutdown margin
- reactivity coefficient
- reactivity worth