A simple method for reactivity determination based on integral version of pulsed neutron area-ratio method

A simple method for reactivity determination is formulated, which is based on the integral version of the pulsed neutron area-ratio method. The simple method determines the static reactivity from one-point measurement by using a correction factor. The present method was examined in the measurements of subcriticality ranging from -3 to -40 dollars at Very High Temperature Reactor Critical Assembly, VHTRC. It is shown that the simple method gives almost constant value of reactivity at any measuring point and also gives essentially the same results as the integral version. (author)