Xenon oscillations are a phenomenon at higher levels of power where xenon-135 loss due to neutron capture is dominant. For example, in a typical large thermal environment, if Xe-135 burnup is 10 times more than its decay rate, it tends to exhibit

xenon oscillations. Find out threshold thermal flux levels in these reactors beyond which core exhibit diverging spatial xenon oscillations. Data: \(\lambda_{\mathrm{xe}}=2.12 \times 10^{-5}, \sigma_{\mathrm{a}}^{\mathrm{x}^{\mathrm{e}}}=2.7 \times 10^{-6}\) barn). Answer: Flux level \(=7.851 \times 10^{13} \mathrm{n} / \mathrm{cm}^{2} / \mathrm{s}\).

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TABLE 7.8 Reactor 7 (cm) a (cm) , (cm) A 29 0.065 0.106 B 160 5.44 10-03 x 5.58 x 10-03 C 250 0.03522 0.05579