Standards & Documentation

摘要

The following standards have been published: ANSI/ANS-5.1-2014, Decay Heat Power in Light Water Reactors (revision of ANSI/ ANS-5.1-2005). This standard sets forth values for the decay heat power from fission products and actinides following the shutdown of light-water reactors using nuclear fuel initially containing U-235 and U-238. The decay heat power from fission products is presented in tables and equivalent analytical representations. Contributions from the decay of U-239 and Np-239, and the contributions from all other actinides, are represented separately. Methods are described that account for the reactor operating history, for the effect of neutron capture in fission products, and for assessing the uncertainty in the resultant decay heat power. The standard applies to decay times up to 10~(10) s after shutdown.