This standard sets forth values for the decay heat power from fission products and239U and 239Np following shutdown of light water reactors (LWRs) containing 235U@238U@ and plutonium. The decay heat power from fission products is presented in tables and equivalent analytical representations. Methods are described which 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. Decay heat power from other actinides and activation products in structural materials@ and fission power from delayed neutron-induced fission@ are not included in this standard.