Rise in Temperature; efficiency and heat flow?

Question

A nuclear power plant has a power output of 1000 MW and operates with an efficiency of 34%. If excess heat is carried away from the plant by a river with a flow rate of 1.0 x 10^6 kg/s, what is the rise in temperature of the flowing water?
Answer in °C.

Answer 1

E percent of the energy generated is sent out of the plant as electricity, at a rate of P MW. That means that (100-E) percent of the energy is dissipated as heat.

Thus, if H is the rate of heat dissipation in MW, we have:

(100-E)/E = H/P

One kilocalorie is the amount of energy required to raise the temperature of 1 kg of water 1 degree Centigrade.

http://en.wikipedia.org/wiki/Calorie

We can convert H from MW to C kilo-calories/second.

This heat is being taken up by a flow of F kg of water per second.

C kilo-calories added to F kg should increase the temperature by C/F degrees Centigrade.