Comparison of Calculations and Measurements of Fission Product Decay Heat for Uranium-235 and Plutonium-239 for Cooling Times >5 × 10⁴ s

Calculations of fission product decay heat from ²³⁵U and from ²³⁹Pu based on the nominal values prepared for use in the ANS 5.1 Draft Standard (1978) are in very good agreement with measurements for cooling times from 5.0 × 10⁴ to 1.8 × 10⁷ s. This good agreement for ²³⁹Pu tends to support the ²³⁹Pu experimental values of Dickens et al. rather than those of Yarnell and Bendt for cooling times <10⁵ s.