The decay heat is about 5% of full reactor power at shutdown, but decreases exponentially thereafter, to about 1% at 4 hours, etc. Daiichi units 1 & 3 are abou

The decay heat is about 5% of full reactor power at shutdown, but decreases exponentially thereafter, to about 1% at 4 hours, etc. Daiichi units 1 & 3 are about 1.4 and 2.4 MW(th) respectively.