Self-Limiting Power Excursion Characteristics of Light Water Reactor, (VI)

The theoretical analysis code named REACT, devised for covering pulsed operation of the HTR, is based on a two-point kinetic model, one point representing the average of the core, while the other is optional (e.g. hottest spot). The behavior of reactor power and other parameters are calculated by the average point, and the temperature of the hottest spot by the other point at same time.

Improvements were brought to the code based on experimental data, and good agreement was found between calculation and experimental results obtained for pulsed operation. The feedback reactivity due to the Doppler effect was comprehensively evaluated by recalculation of experimental data; the void behavior was also investigated.