Research On Core Physics Of IP200

Compared with the large-scale nuclear reactors, the integral pressurized water reactorshave the advantage on low cost and high safety. Plate-shaped fuel elements are mostly appliedin research reactors and marine nuclear system. Compared with rod-shaped fuel elements,plate-shaped fuel elements have advantage on economy and safety. IP200is an integralpressurized water reactor which plate-shaped fuel elements are employed. The work on corephysical design of IP200is not proposed. So, the work on the core physical design of IP200isnecessary.Firstly, the IAEA10MWth MTR benchmark calculation has been done by HELIOS-1.11,which is a two dimensional neutron and gamma transport code for lattice burn-up calculationdeveloped by Studvisk. And the influence of the spatial discretization and current couplingorder conditions is investigated. Secondly, this thesis finished the core physical design ofIP200, which are based on the conceptual design and the steady-state thermal and hydraulicdesign. And the core steady-state physical calculation of IP200design plan is conducted byHELIOS-1.11.Additionally, the influence of different burnable materials and differentarrangements chosen in design plan on assembly and core physical behavior is discussed inthis thesis. Lastly, the calculation of the control rod system and the critical boron has beendone.Compared with the IAEA10MW MTR benchmark, the result provide a reasonablespatial discretization and current coupling order conditions regarding the burn-up calculationof plate-shaped fuel elements by HELIOS-1.11. In addition, the effect of different burnablepoison plans on assembly and core is discussed in the paper. The results showed that Gd2O3have great negative influences on power peak factors. When using the Er2O3instead of Gd2O3,the power peak factors can be improved but it will impose negative influences on the end ofcycle. Finally, the mix burnable poison arrangement plan, which adopts Gd2O3incombination of Er2O3burnable material is proposed. The physical design plan can satisfiedthe racial peaking factor criterion, temperature coefficient, core shut down margin and othercriterions. And after thermal calculation, the fuel meat maximum temperature and the fuelclad maximum temperature are remained blow the limit temperature. The full power operating time of the core physical design is more than500days, which can fits the design demands.This thesis provides an important theoretical and reference basis on integral pressurized waterreactor which based on plate-shaped fuel elements.