L D 0.9cm = 16cm + (0.0565 +0.00029)/cm By use of Table 19.1 with d=0, the cubical reactor has a geometric buckling of B=3(/a)=3(/100cm)=0.0030/cm The average flux may be obtained from the thermal power P (200 103W) (3.29 10 fission/(Ws)) wV (8.3 10/cm) (582.6 1024 cm)(100cm) The total neutron absorption rate across the core is = 1.36 10n/(cms) Ra=a avg V = (0.0565 +0.00029/cm) (1.36 10n/(cms)) (100cm) = 7.7 1015 n/s Using Eq. (19.15), the neutron leakage rate is R =RL B = (7.7 105 n/s) (16cm) (0.0030/cm) = 3.7 10n/s