Fuji NP1X3206-A Module

100% Brand New Module Fuji NP1X3206-A

Description

MSR-FUJI is based on the ORNL’s results, and has been optimized as a small sized plant andfurther simplified by removing the online reprocessing facility. Based on the operatingexperience at three experimental MSRs in ORNL, it has been verified that MSR-FUJI isfeasible. The steam generator (SG) is however a major unverified component but it can bedeveloped based on Fast Breeder Reactor (FBR) experience and the recent supercriticalpower station technology.MSR-FUJI adopts a passive safety system to improve the safety, reliability as well as theeconomics. 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 ataccidents is minimized. MSR-FUJI is operated at very low pressure (0.5 MPa), and a thickreactor vessel and pipes are not required. There are no fuel assemblies or complex coreinternal structure with the only component within a reactor vessel being the graphitemoderator. 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 heatexchanger (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 redundantdepending 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 itsheat is transferred to the secondary salt through a HX. Then, its heat produces 538°Csupercritical steam at a SG, and generates electricity by a supercritical T/G. Owing to its hightemperature, MSR-FUJI can achieve 44% thermal efficiency.Since molten salt is used as fuel and coolant, loss of coolant accident (LOCA) may need anew definition for MSR. In case of pipe break, leaked molten salt is drained to an emergencydrain tank without passing through a freeze valve. Even in this case, a molten salt loopreturns to atmospheric pressure when a pump stops, and a pressurization accident isincredible, owing to its low vapor pressure. Therefore, an emergency core cooling system(ECCS), containment cooling system (CCS), makeup water pools, and automaticdepressurization system (ADS) are not required. 

Fuji Module

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