Before revision: where is the decay power , is the reactor power before shutdown, is the time since reactor startup and is the time of reactor shutdown measured from the time of startup (in seconds) .
After revision: where is the time since reactor startup, is the power at time , is the reactor power before shutdown, and is the time of reactor shutdown measured from the time of startup (in seconds) An approximation for the decay heat curve valid from 10 seconds to 100 days after shutdown is