Decay heat calculation for minor actinides in the hybrid method

For evaluation of decay heat from the fission of minor actinides (MAs) we are currently forced to rely only on summation calculations since there has been no direct measurement for these nuclides. In this paper, we use an alternative approach (named 'hybrid' method) to evaluate the MA decay heat power using the measured decay heat powers for major actinides at YAYOI. Results for the fast fissions of 237Np, 241Am, 243Am, 242Cm and 244Cm are in support of the summation calculations for β decay heat, but suggest notable uncertainties in γ decay-heat summation calculations. (author)