Abstract
In order to minimise the mass of a 1MWe LEU space fission power system design, a rapid method of carrying out neutronic and thermal hydraulic analysis for the reactor is required. A two-stage deterministic analysis routine has been constructed using a core-plane method of characteristics calculation followed by a full-core SP3 calculation, within the ANSWERS© code WIMS11. This is compared to a faster route that skips the core-plane calculation and also the Monte Carlo code Serpent. Results suggest sufficiently-good agreement for the WIMS-based methods to be useful in a full system mass-minimising optimisation routine. The neutronics scheme is coupled with a simple sub-channel thermal hydraulics code with a finite-element heat conduction model for the fuel block.
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