Verification of DeCART/CAPP Code System for VHTR Core with PMR-200 Benchmark

Abstract

In this paper, the DeCART/CAPP Code System is verified for VHTR (Very High Temperature Reactor) analysis with PMR-200 Benchmark problem. The DeCART/CAPP deterministic code system is composed of transport code DeCART and diffusion code CAPP. The DeCART/CAPP code system can be used in a two-step method to analyze the neutronics behavior of VHTR (Very High Temperature Reactor) full cores. In this paper, the DeCART/CAPP code system is verified against VHTR PMR-200 (Very High Temperature Reactor Prismatic Modular Reactor 200) benchmark problems. The Monte Carlo code McCARD is used to produce the reference solutions to compare with the deterministic solutions from DeCART/CAPP. In this verification process, the effective neutron multiplication factor k-eff and the fuel temperature coefficient (FTC) are systematically compared between codes. The VHTR simulation capability and accuracy of DeCART, CAPP and DeCART/CAPP are verified on 2D and 3D PMR-200 benchmark problems. It is expected that the DeCART/CAPP code system can be used for nuclear design and nuclear core simulation of VHTR PMR-200.