Measurement of the Infinite Multiplication Constant of Natural Uranium--Graphite Lattices in the RB-1 Critical Assembly by Means of the Zero Reactivity Method. MISURA DELLA COSTANTE DI MOLTIPLICAZIONE INFINITA DI RETICOLI A URANIO NATURALE E GRAFITE NELL'INSIEME CRITICO RB-1 CON IL METODO DELLA REATTIVITA' NULLA

Technical Report · Fri Jul 01 04:00:00 EDT 1966

OSTI ID:4422265

Ghillardotti, G

To reduce uncertainties to the minimum, measurements in the RB-1 were conducted on the same materials and with the same instrumentation as those used previously in MARIUS. The values measured in the RB-1, compared with the already known substitution data, are as follows: (a) the difference between the multiplication and the absorption intensity; (b) the fine structure of the flux in the cell; (c) the Pu/U index. The infinite mutiplication factor K{sub infinity} is obtained by combining measurements (a) and (b). The results of this research can be summed up as follows: 1. A consistent and complete experimental procedure has been devised for measuring the K{sub infinity} of natural uranium/graphite lattices by means of the zero reactivity method. The same applies to the procedure for analysis of the experimental data. 2. The error in (K{sub infinity} -- 1) inherent in the measurement can in our opinion be reduced to 2%. This limit was reached in the last experiment on lattices consisting of tubular elements. 3. Agreement proved to be good with the results obtained by the CEA in the critical assembly MARIUS. (auth)

• Research Organization: Societa Nazionale Metanodotti, Milan (Italy). Laboratori Reuniti Studi e Ricerche
• NSA Number: NSA-21-023715
• OSTI ID: 4422265
• Report Number(s): EUR--3126.i
• Country of Publication: Italy
• Language: Italian

Related Subjects

CRITICAL ASSEMBLIES
GRAPHITE
LATTICES
MARIUS
MEASUREMENT
N38510* --Research & Test Reactors & Critical Assemblies-- Kinetics & Dynamics
RB-1
REACTIVITY
RESEARCH REACTORS
URANIUM