THE FUEL BUILDING RADIATION ENVIRONMENT OF 1000MW PWR DURING SEVERE ACCIDENT

When spent fuel pool (SFP) loss of cooling the spent fuel assemblies in there will eventually melt and release a number of radioactive nuclides. In this article, we build a model of the 1000MW pressurized water reactor fuel building through MAAP5 program to simulate the situation of spent fuel pool in situation of loss of cooling, in order to consider radiation environment. Results including water level change in pent fuel pool, fission products release time during severe accident, fraction of fission products in different state and dose rate in the different positon including the place installed monitoring instrument. The dose rate also is one entry condition for the severe accident management guideline (SAMG).