Abstract
Critical experiments were performed on an annular assembly of 9(3.2) wt% /sup 235/U enriched U-Al alloy fuel elements in light water to provide data for the design and operation of a subcritical neutron multiplier of a /sup 252/Cf neutron source. The various factors affecting criticality were determined. In addition to measurement of the critical fuel rod loading under various conditions, values of k/sub eff/ were determined as a function of fuel rod loading by means of pulsed neutron source experiments. The data provide the design basis for operation of the neutron multiplier, yielding a maximum flux value in the internal irradiation column consistent with maintaining a degree of subcriticality in operation.
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