Reactor Operator Practice Exam

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Which statement describes xenon-135 behavior after reactor shutdown?

After shutdown, xenon increases as iodine decays.

Xenon-135 buildup after shutdown comes from the decay of iodine-135 into xenon-135. During operation, iodine-135 is produced and accumulates; when the reactor is shut down, production stops, but the existing iodine-135 continues to decay, feeding xenon-135. Xenon-135 itself decays with its own half-life, so its concentration rises for a time as iodine-135 decays, and then falls as Xe-135 decays away. This makes the description that xenon-135 increases after shutdown as iodine-135 decays the best fit. It isn’t zero right after shutdown, and it isn’t removed all at once; the buildup is driven by the ongoing decay of iodine-135 before Xe-135 declines.

Xenon-135 decays immediately after shutdown.

Xenon-135 remains at zero after shutdown.

Xenon-135 is completely removed during shutdown.

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