Based on the Rossi- αtheory and measurement technique, experiments were carried on measuring the prompt neutron decay con- stant with Rossi-α measurement equipment under the sub-critical and delayed critical of CFBR-Ⅱ reactor and a series of prompt neutron decay constant acquired provides the benchmark data for other experiments.

In this paper, structure, operation mechanism, and inherence security of CFBR-Ⅱ reactor were introduced, possible accident/event type were enumerated too.

The reactivity temperature effect of CFBR-II reactor is analyzed with single-group perturbation theory, the calculation formulas of the reactivity temperature coefficients of CFBR-II reactor under steady-state and pulse-state are obtained, and the factors that have influence on reactivity-tempera-ture-coefficient of CFBR-II reactor are discussed.

Design of Fast Neutron Experiment Device at Pulsed Reactor;

Neutron fluence of pulsed condition in irradiation chamber of UZrH pulsed reactor is measured with multiple foil activation technique.

The residual heat removal safety in pulsed reactor was studied experimentally in the paper.

For the pulse reactor Godiva-Ⅱ.

The design of experimental device for the time of flight spectrum in the thermal column of the pulse reactor measurement was given, and the time spectrum measured result was shown at the same time.