SOURCE TERM ANALYSIS OF LONG-LIFE 620 MWt BWR DURING LOSS OF COOLANT ACCIDENT (LOCA)

• Main Author: AMAR (NIM : 24908005); Tim Pembimbing : Dr. Zaki Su’ud Dr. Ir. Ari Darmawan Pasek, HIDAYATI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/15941
• Institution: Institut Teknologi Bandung

Source term analysis on a long-live 620 MWt BWR has been performed. The study includes fuel cell calculations, multigroup diffusion equation calculation with 8 groups of energy, source term calculations and dose calculations. The <br /> <br /> <br /> <br /> <br /> <br /> scope of the source term analysis includes fission product inventories calculation in core, their activity and their toxicity during the Loss of Coolant Accident (LOCA). <br /> <br /> <br /> <br /> <br /> <br /> The fuel cell calculation results have been used in multigroup difussion calculation to obtain neutron flux and power distributions. The neutron flux distribution for fast neutron increases in higher enrichment region and decreases <br /> <br /> <br /> <br /> <br /> <br /> in the thermal neutron region because of the absorption of the fissile material. The power distribution shows that power increase in higher enrichment region. <br /> <br /> <br /> <br /> <br /> <br /> The analysis assumed that the reactor accident occurs after has been operated for 10950 days or 30 years with full power of 620 MWth. The total activity of the core is 1,12x109 Ci, and the higher inventory of the core is dominated by the transuranium elements. The release of fission product activity to the atmosphere is 1,11x107 Ci. And the toxicity analysis shows that there 150 nuclides released to the atmosphere categorized as dangerous (category 5 up to category 1). <br /> <br /> <br /> <br /> <br /> <br /> Whole body dose calculation result in exclusion zone is 7.17x10-04 rem and the thyroid dose calculation result in this zone is 7.21x10-02 rem. And for the whole body dose calculation result in low population zone is 2.69x10-05 rem and the thyroid dose calculation result in this zone resulted 1.80x10-03 rem. The values are still below the requirements of maximum limitation value which are 1.25 rem and 1 rem.