Total fission power in highly thermalized reactor core in equilibrium condition mainly comes from fissions in U-235 and Pu-239. If such a thermal reactor attains a stable reactor period of 1 minute for a net core reactivity of \(0.8 \mathrm{mk}\), estimate percentage contribution of Pu-239 fissions. Data: \(\beta_{\mathrm{U}-235}=0.0065, \beta_{\mathrm{Pu}-239}=0.0021, \lambda\left(\mathrm{s}^{-1}ight)=0.095\). Ignore fast fissions in U-238. Take importance factor equal to unity.

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