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Measurement of effective delayed neutron fraction for NASA Zero Power Reactor I

Donald L. Alger, W. T. Mayo, Richard A. Mueller

Abstract

The effective delayed neutron fraction Peff has been experimentally determined for each of three uranyl fluoridewater solution reactors in the NASA Zero Power Reactor I facility.The hydrogen to uranium 235 atom ratios R for the solutions in these measure ments a r e 190, 473, and 565.The value of peff has been measured by the boron substi tution method.Values for Peff obtained a r e 0.0090~0.0006,0.0086*0.0005,and 0.0082*0.0004for the respective atom ratios.Calculated values of peff a r e in reason able agreement with the experimental results.

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Key concepts: Nuclear engineering, Fraction (chemistry), Neutron, Zero (linguistics), Delayed neutron, Physics, Nuclear physics, Environmental science