RAST-F

Download Intro_RAST-F (Sep. 2024)

The Recommended Publication for Citing

1. Tuan Quoc Tran, Alexey Cherezov, Xianan Du, Deokjung Lee*, "Verification of A Two-Step Code System MCS/RAST-F to Fast Reactor Core Analysis," Nucl. Eng. Tech., 54(5): 1789-1803,  https://doi.org/10.1016/j.net.2021.10.038 (2021)

2. Tung Dong Cao Nguyen, Hyunsuk Lee, Deokjung Lee*, "Use of Monte Carlo Code MCS for Multigroup Cross Section Generation for Fast Reactor Analysis," Nucl. Eng. Tech., 53(9): 2788-2802, https://doi.org/10.1016/j.net.2021.03.005 (2021)

3. Tuan Quoc Tran, Siarhei Dzianisau, Tung Dong Cao Nguyen, Deokjung Lee*, "Verification of a depletion solver in RAST-K for Fast Reactor Analysis," KNS Winter Meeting, Korea (online), Dec 16-18 (2020)

4. Jaerim Jang, Alexey Chezerov, Yunki Jo, Tuan Quoc Tran, Siarhei Dzianisau, Woonghee Lee, Jinsu Park, Deokjung Lee*, "Verification of RAST-K hexagonal transient solver with OCED/NEA benchmark problem of KALININ-3 NPP," KNS Winter Meeting, Korea (online), Dec 16-18 (2020)

5. Jaerim Jang, Tuan Quoc Tran, Siarhei Dzianisau, Woonghee Lee,  Deokjung Lee*, "Verification of RAST-K hexagonal analysis module with SNR and VVER-440 benchmarks," KNS Winter Meeting, Korea (online), Dec 16-18 (2020)

Introduction

The RAST-F code is under further development at the Ulsan National Institute of Science and Technology (UNIST) for the hexagonal-z geometry including the extension of two-group rectangular solver to multi-group hexagonal solver and the update of thermal-physical properties of fast reactor core materials in the internal thermal-hydraulic solver. The triangle-based polynomial expansion nodal (TPEN) method is implemented in the code to solve the multi-group neutron diffusion equation in the 3D hexagonal-z geometry. The change of nuclide concentrations during burnup steps are determined by solving Bateman equation. At present,  Chebyshev Rational Approximation Method (CRAM) is implemented in nodal diffusion code RAST-K and is adopted for fast reactor with hexagonal lattice (RAST-HEX). Acceleration of the RAST-F depletion solver by GPU is also under interrogation. The required 24 energy group cross section set for RAST-HEX can be generated using our in-house Monte Carlo code MCS.

Physics Model

Neutronics

– Triangle-based Polynomial Expansion Nodal method (TPEN)

– CMFD acceleration

XS model

– Multi-group group constants from STREAM2D

– Micro XS for micro depletion

TH feedback

– 1D radial heat conduction

Fuel cycle analysis

– Micro-depletion for 28 actinides and 193 fission products

– CRAM depletion solver

– Sparse Gauss-Seidel Solver

– Predictor/corrector

– Triangle depletion

Engineering Features

– Multi-cycle calculation (shuffling, rotation)

– Restart calculation

The RAST-F is verified by MCS with an in-house design of a SMLFR