Pressurized Water Reactor Design Internal Cooling Concept And Research Physical Characteristics

Compared to ordinary PWR，the geometry of IPWR（Inverted Pressurized WaterReactor) modification consists of inverting the relative position of fuel and coolant,thus generating the so-called inverted geometry. Due to the particularity of invertedgeometry of IPWR, UTh0.5Zr2.25H5.625was selected for the IPWR. And it has asmaller core pressure、a lower fuel temperature、a more uniform circumferential flowand a smaller tremor phenomenon, these advantages have a important sense toincrease the core power. So a preliminary conceptual design was carried by used ofMCNP and CFD.In this paper, by using MCNP and CFD, a detail physical and thermal calculationhas been carried out for IPWR core, my work is mainly responsible for the physicalpart of the study, which including the undermoderated fuel cell analysis、assemblyenergy spectrum analysis、core power distribution analysis and the thermal-hydraulicanalysis of Average fuel cell and heat fuel fell. The results show that when the coolantchannel diameter of the reactor core fuel cell is11mm, the IPWR has the best physicsand thermal performance. At this time, The thermal power of the core is4000MW,core radial power peak factor is2.1, axial power peak factor of the hottest fuel cell is2.3. Through a further Power flattened, at last the core radial power peak factor is1.51,axial power peak factor of the hottest fuel cell is1.59, the fuel and claddingtemperature are both lower than its limit, and there has a negative temperaturecoefficient reactivity and negative void reactivity. Finally when compared the IPWRresults with the ordinary PWR, it find that IPWR has a larger advantage on thepressure drop, production safety and power output. Therefore, the design resultsconformed to the requirements of the IPWR design task, so it provide a reference andbasis for subsequent IPWR core design and further improvement.