100% Brand New Module Fuji NP1AX08-MR

Description

MSR-FUJI is based on the ORNL’s results, and has been optimized as a small sized plant and further simplified by removing the online reprocessing facility. Based on the operating experience at three experimental MSRs in ORNL, it has been verified that MSR-FUJI is feasible. The steam generator (SG) is however a major unverified component but it can be developed based on Fast Breeder Reactor (FBR) experience and the recent supercritical power station technology. MSR-FUJI adopts a passive safety system to improve the safety, reliability as well as the economics. Molten fuel salt can be drained to a sub-critical drain tank through a freeze valve. Since gaseous fission products (FP) are always removed from molten fuel salt, the risk at accidents is minimized. MSR-FUJI is operated at very low pressure (0.5 MPa), and a thick reactor vessel and pipes are not required. There are no fuel assemblies or complex core internal structure with the only component within a reactor vessel being the graphite moderator. Based on these design principles in-factory fabrication would be simple.

The nuclear steam supply system (NSSS) consists of a reactor core, pipes, pumps, a heat exchanger (HX), and a steam generator (SG), which supplies steam to a turbine/generator (T/G), as is shown in Figure 1. This figure shows only one loop, but a loop can be redundant depending on a plant size or a need for flexibility. MSR-FUJI is designed to produce an exit temperature of 704°C in molten fuel salt, and its heat is transferred to the secondary salt through a HX. Then, its heat produces 538°C supercritical steam at a SG, and generates electricity by a supercritical T/G. Owing to its high temperature, MSR-FUJI can achieve 44% thermal efficiency. Since molten salt is used as fuel and coolant, loss of coolant accident (LOCA) may need a new definition for MSR. In case of pipe break, leaked molten salt is drained to an emergency drain tank without passing through a freeze valve. Even in this case, a molten salt loop returns to atmospheric pressure when a pump stops, and a pressurization accident is incredible, owing to its low vapor pressure. Therefore, an emergency core cooling system (ECCS), containment cooling system (CCS), makeup water pools, and automatic depressurization system (ADS) are not required.

Fuji Module

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