Study on the critical rod position prediction on CARR after shutdown and restarting

The iodine pit configuration from 5 MW to 60 MW at 3 core loading states has been calculated by MVP-BURN program. Based on the iodine pit depth and rod lattice worth calculated, the Visual C++ 6.0 platform was used to develop a quick search program. Experiments have shown that the prediction has good coincidence between the calculated rod position and the real operation value. It will provide an important reference for the safe start-up of the reactor in iodine pit later. (authors)