**1. The problem statement, all variables and given/known data**

A PWR supplied with 100Tonnes of 2.5% U-235 is to be energised. With Φ=1.5×1013 (neutrons/[itex]cm^{2}[/itex].s) we can achieve up to 4years without refueling.

**2. Relevant equations**

Find the thermal power output of the reactor at the beginning of the operation.

**3. The attempt at a solution**

No reaction rate from formula paper allows to follow through the question as all of them require Volume of the reactor.

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