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- W113457034 abstract "An innovative concept of PFPWR50 has been studied, which is a small PWR using carbon-coated particle fuels with cladding. The thermal power of PFPWR50 is 50 MW and it provides district-heating service as long period as possible. The particle fuel has been used in a HTGR that uses graphite as moderator, but PFPWR50 uses both pressurized light water and graphite as moderator. This concept takes advantage of fuel integrity against fission products release and reliability of PWR technology. From the viewpoint of confinement of radioactivity, the fuel can enhance the safety of the reactor. In the previous study, ThO{sub 2} and PuO{sub 2} have been used as the kernel of coated particle fuel with zircaloy cladding. The excess reactivity was able to be suppressed and the swing of the reactivity was also able to be mostly eliminated during a cycle by appropriately loading the fuel with burnable poison. The burnable poison used in this study being gadolinia, burn-up characteristics have been studied for a variety of concentrations of gadolinia. We have investigated burn-up characteristics of fuel rods, assemblies, and reactor cores by the calculation code SRAC95. The results show that it is possible to suppress and flatten the excess reactivitymore » during a cycle by combining at least 6 types of assemblies in which the quantity of gadolinia is different. The core life of a cycle is about 8.9 equivalent full power years (EFPY). As another investigation, we have studied the utilization of ceramics cladding comparing with zircaloy cladding in PFPWR50. The ceramics to be compared is SiC, which could deal with the problem of hydrogen embrittlement of zircaloy by long term operation. That allows PFPWR50 to reach to the higher burn-up keeping high fuel integrity. From calculation results, it is found out that the burn-up characteristics do not change significantly and the suppression of excess reactivity by gadolinia remains effective. Therefore, it can be said that SiC could be used as the material of cladding in PFPWR50. Also, the core life is slightly extended because the excess reactivity increases throughout a cycle. (authors)« less" @default.
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- W113457034 date "2006-07-01" @default.
- W113457034 modified "2023-09-24" @default.
- W113457034 title "Small PWR Using Coated Particle Fuel with Ceramics Cladding" @default.
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