عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this work, the effect of control rods on TRR safety parameters was studied in the both case of static and transient behavior. In this paper the effect of the control rods movements (70%) on the power peaking was used in the form of normalized function instead of COS function in the TERMIC cod. The results of new function, investigated on thermo-hydraulic parameters in the steady state and transient condition. . In the steady state with 5 MW thermal power, the results showed that the safety margin in new condition (70% insertion) decreased respect to the 0% insertion of control rods. Also in the transient section the axial function of the power distribution was applied in the input of the PARET cod. The direct influence of control rods on the power peaking, was production of nucleate boiling earlier than COS ship function. This effect reduced the power and temperatures due to the void coefficient feedback. In the last section, the effect of the control rods insertion on the reactivity feedback coefficient was considered in transient scenario. Increment of the reactivity feedback coefficient due to control rods insertion along with direct effect of control rods, caused a significant decrease in all thermo-hydraulic safety parameters.