RBMK REACTIVITY COEFFICIENTS AT MINIMUM CONTROLLABLE POWER

摘要

When started up according to the regular procedure, a RBMK reactor is first put into a critical state and then into the minimum controllable thermal power level 160 MW by extracting a manual control rod from the fully inserted state to the top over-hoist prevent ends. The power release nonuniformity is considerable in the process. The radial power release nonuniformity coefficient K_r can reach 3-3.5 and the axial coefficient K_z = 2-3. In the past, no action was taken to equalize the power release at the minimal controllable level. Smoothing began at higher power, when in-reactor sensors monitoring power release and the PRIZMA program begin to function reliably.