Reactivity from power spectral density measurements with /sup 252/Cf. [LMFBR]

Mihalczo, J.T.; Paré, V.K.; Ragan, G.L.; Mathis, M.V.; Tillet, G.C.

doi:10.2172/7096009

1977

DOI: 10.2172/7096009

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Reactivity from power spectral density measurements with /sup 252/Cf. [LMFBR]

J.T. Mihalczo¹,

V.K. Paré²,

G.L. Ragan³

et al.

Abstract: NOTICE This document contains information of preliminary nature. It is subject to revision or cor.re.c.tion and therefore does not represent a final report.On loan from ERDA. Now associated with the CRBR Project Office in Oak Ridge, Tennessee.

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1985

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“…(30) the doubly indexed array of ordinary differential equations satis fied by the joint probability mass function that describes the random point [N(t), M(t)]. Now, turn the L-counter back on and write down the triply indexed array that describes the random point [N(t), L(t), M(t)].…”

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Experimental study of neutron noise with criticality safety applications in mind

Barnett¹

1985

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I studied the statistics of detected neutrons that leaked from four subcritical re flected, enriched-uranium assemblies, to explore the feasibility of developing a crit icality warning system based on neutron noise analysis. The calculated multiplica tion factors of the assemblies are 0.59, 0.74, 0.82, and 0.92.1 studied three possible discriminators, i.e., three signatures that might be used to discriminate among as semblies of various multiplications. They are (1) variance-to-mean ratio of the counts in a time bin (VIM), (2) covariance-to-mean ratio of the counts in a common time bin from two different detectors (C/M), (3) covariance-to-mean ratio of the counts from a single detector in two adjacent time bins of equal length, which I call the serial-covariance-to-mean ratio (SC/M). The performances of the three discrimi nators were not greatly different, but a hierarchy did emerge: SC/M ^ V/M ^ C/M. An example of some results: in the neighborhood of k = 0.6 the Afc required for satisfactory discrimination varies from about 3% to 7% as detector solid angle varies from 19% to 5%. In the neighborhood oik = 0.8 the corresponding Ms are 1% and 2%. The noise analysis techniques studied performed well enough in deeply subcritical situations to deserve testing in an applications environment. They have a good chance of detecting changes in reactivity that are potentially dangerous. One can expect sharpest results when doing comparisons, i.e., when comparing two records, one taken in the past under circumstances known to be normal and one taken now to search for change.

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Experimental study of neutron noise with criticality safety applications in mind

Barnett¹

1985

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Reactivity from power spectral density measurements with /sup 252/Cf. [LMFBR]

Abstract: NOTICE This document contains information of preliminary nature. It is subject to revision or cor.re.c.tion and therefore does not represent a final report.On loan from ERDA. Now associated with the CRBR Project Office in Oak Ridge, Tennessee.

Cited by 1 publication

References 9 publications

Experimental study of neutron noise with criticality safety applications in mind

Experimental study of neutron noise with criticality safety applications in mind

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