Actions for Experimental Study of the Nordheim Relationship. Report No. 20; ESTUDIO EXPERIMENTAL DE LA RELACION DE NORDHEIM. Informe No. 20.

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Experimental Study of the Nordheim Relationship. Report No. 20; ESTUDIO EXPERIMENTAL DE LA RELACION DE NORDHEIM. Informe No. 20.

Author
Chamero, J. A.
Published
[Place of publication not identified] : [publisher not identified], 1959.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1959.
Physical Description
microopaque : positive ; 8 x 13 cm

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Language Note
In Portuguese
Summary
A usual method for the nneasurement of the reactivity variation on poison removal from a critical reactor consists in the measurement of the stable period of the neutron flux increase and utilization of the Nordheim relation. It is possible in a subcritical reactor to compare one reactivity with another by measuring the neutron flux levels after the introductlon of reactivity. The results obtained by both methods are compared in the present work. Using a standardized poison at a given point of the core a value delta k measured for the stable period is obtained. In the subcritical reactor equal poisons are added to the standard in positions symmetrical with respect to the center of charge of the core and the reactivities are compared; thus it is proved that within certain limits there is additivity of the reactivities, or an associated reactivity n delta k corresponds to n standard poisons. In a second experiment such poisons were extracted in a critical regime and the stable periods resulting from the extractions were measured. These experiment periods were compared with those predicted by the Nordheim relation. As the parameters differ according to source, comparisons were made with different sets of values. In all cases the agreement between the measured period and the calculated period was shown to be within the errors of the method. (tr-auth)
Report Numbers
NP-8249
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
NSA number: NSA-14-006773
OSTI Identifier 4201313
Research organization: Argentina. Comision Nacional de Energia Atomica, Buenos Aires.
View MARC record | catkey: 41356069