[2H10-13] Transient Analysis

[2H12] Supercritical transient analysis in light water moderated coupled small fuel debris regions using integral kinetic model and point kinetic model

*Delgersaikhan Tuya¹, Jun Nishiyama², Toru Obara² (1.Department of Nuclear Engineering, Tokyo Institute of Technology, 2.Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology)

Keywords:criticality accident, Fukushima Daiichi, coupled fuel debris, integral kinetic model, point kinetic model

Supercritical transient analysis were performed in symmetric and asymmetric systems of light water moderated coupled small fuel debris region using the integral kinetic model (IKM) and point kinetic model (PKM). The obtained quantities include fission rate profile, released energy, and temperature in whole system by the PKM. The same quantities were obtained for each region by the IKM. Results shows the PKM gives more conservative results than the IKM in asymmetric systems.