Nuclear and thermal analysis of the transition core to MK-III (III)

not registered; not registered; not registered

Nuclear analyses are performed for the transition core to MK-III core. The contents of this calculation are as follows. (1)Excess reactivity or the transition core is 5.4 % k/kk' at the beginning of 35 cycle, which is below the nuclear limit, 5.5 % k/kk'. (2)Maximum linear heat rate is 355 W/cm, maximum fuel temperature is 2,298C and maximum cladding temperature is 647C. These temperatures are below the thermal limits. (3) Minimum control rod worth of one rod stuck is 7.4% k/kk' at 32 cycle and 7.3% k/kk' at 35 cycle. The core or 100C is subcritical at one rod stuck. (4) The reactivity coefficients at 32 cycle and 35 cycle are near ones or MK-II core and MK-III core.