Assessment and Sensitivity Analysis Of the temperature feedback effect in both 70C and 60C library on the Tehran Research Reactor kinetic parameters using the Monte Carlo method

The Purpose of this study was to calculate kinetic parameters Tehran Research Reactor sensitivity analysis taking into account the effect of temperatures feedback using the code MCNPX. Kinetic parameters including effective delayed neutron fraction (βeff) and the mean generatin time (Λ). The exact calculation of these parameters is very important for immune function and Reactors control. And to play an important role in the analysis of the system dynamic. In this study by changing the temperature, and other materials used in the core of Tehran Research Reactor from 20 O C to 100 O C The effects of temperature change on the reactor kinetic parameters for both 70C and 60C library which are at 20 O C or 293 O K and for fuel enrichment 20% and 80% have been investigated. Results show that The effective multiplication factor (Keff) by changing temperature is reduced for both cross section and for both enrichment. And its value by increasing temperature in 70C library is more than 60C library in both Enrichment. The prompt life time (ℓ) and effective delayed nutron fraction(βeff) values rising temperature increases in both library and both enrichment. And the amount of them by increasing temperature in 70C library are more than 60C library in both enrichment. The amount of mean generation time (Λ) considering changes in temperature rise in 60C library is more than 70C library But generally such as prompt life time (ℓ) parameter by incrasing temprature shows an increasing trend in both 20% and 80% enrichment.