Y. Ishii et al., Verification of a three-dimensional multi-energy group kinetic analysis model by using BWR critical operation data, J NUC SCI T, 36(9), 1999, pp. 755-760
A time-dependent diffusion model of a three-dimensional, multi-energy group
kinetic analysis program STAND has been verified by using neutron detector
responses in the subcritical condition. The responses were obtained from a
BWR start-up examination. STAND is based on a polynomial nodal expansion m
ethod and an improved quasi-static model. It can simulate transients and re
activity accidents of boiling water reactors in critical and subcritical co
nditions, and works efficiently on a vector computer.
This paper describes the core neutronic model including treatment of extern
al neutron sources and verification results tracing about a 10-min control
rod operation during the BWR start-up examination. Calculated transient det
ector responses had good agreement with experimental ones. The CPU time nec
essary to calculate is of behavior for a full core (460 radial meshes x 30
axial meshes) with three energy groups was about 13 s on the HITACHI S-3800
vector computer when the shape function time step was set to 0.1-0.2 s.