Thermal limit analysis with hot-channel model for boiling water reactors

摘要

An analytical method for the initial flux and transient hot water flow parameters for a boiling water reactor with single fuel bundle. Firstly, the method is to calculate intial flux and transient hot water flow parameter based on single fuel bundle. Then, it uses supplier provided CPR (Critical Power Ratio) correlation to calculate transient CPR and calculate the whole reactor core for hot water parameters as boundary condition. Iteration is used to figure out DCPR (Delta Critical Power Ratio). The obtained limit transient is selected as the maximum from DCPR. The maximum transient DCPR combines Safety Limit Minimum Critical Power Ratio (SLMCPR) and safety margin to figure out the OLMCPR (Operating Limit Minimum Critical Power Ratio). Both the plant layout and operational thermal limit are based on OLMCPR to assure the safety of reactor core.