CRITICAL EXPERIMENTS WITH 2.09% U$sup 235$-ENRICHED URANIUM METAL PLATES IN WATER

doi:10.2172/4312099

Abstract

Experiments were performed with 2.09% U/sup 235/-enriched uranium metal plates in a light-water-moderated and -reflected assembly. Each plate was 30 in. long, 31/8 in. wide, and 1/4 in. thick and contained 7.09 kg of uranium. In the first assemblies the plates were arranged in rows with edges adjacent, and the spacing between rows was varied from 5/8 to 1 1/8in. The optimum spacing was about 7/8 in. With the spacing between rows maintained at 7/8 in., the spacing between the edges of the plates was varied from 0 to 5/8 in. The optimum spacing between edges was 5/16 in. The minimum critical mass in these assemblies was 6.74 kg of U/sup 235/. (auth)

Critical experiments with 4. 31 wt % /sup 235/U-enriched UO/sub 2/ rods in highly borated water lattices

Durst, B.M. ; Bierman, S.R. ; Clayton, E.D. August 1982

A series of critical experiments were performed with 4.31 wt % /sup 235/U enriched UO/sub 2/ fuel rods immersed in water containing various concentrations of boron ranging up to 2.55 g/l. The boron was added in the form of boric acid (H/sub 3/BO/sub 3/). Critical experimental data were obtained for two different lattice pitches wherein the water-to-uranium oxide volume ratios were 1.59 and 1.09. The experiments provide benchmarks on heavily borated systems for use in validating calculational techniques employed in analyzing fuel shipping casks and spent fuel storage systems that may utilize boron for criticality control.
DOI: 10.2172/5040217

Full Text Available
AN ANALYTICAL STUDY OF THE MINIMUM CRITICAL MASS OF HIGHLY ENRICHED $sup 235$U WHEN REFLECTED BY NATURAL URANIUM AND WATER MIXTURES IN OPTIMIZED LATTICES.

Gray, A.W. ; Jones, L.L. Jr. January 1970
Criticality experiments with subcritical clusters of 2. 35 wt % and 4. 29 wt % /sup 235/U enriched UO/sub 2/ rods in water with uranium or lead reflecting walls

Bierman, S.R. ; Durst, B.M. ; Clayton, E.D. March 1979

A series of criticality experiments with 2.35 wt % and 4.29 wt % /sup 235/U enriched UO/sub 2/ rods in water have provided well defined benchmark type data showing that both depleted uranium and lead reflecting walls submerged in the water reflector, are better neutron reflectors than water alone. For each fuel enrichment the critical separation between three subcritical, near optimally moderated fuel clusters was observed to increase as either 77 mm thick depleted uranium or 102 mm thick lead reflecting walls were moved toward the fuel. The maximum reactivity effect was observed for the depleted uranium with about 20more »« less
Physical Aspects in the Design of a Research Reactor with Slightly Enriched Uranium (1.5% U$sup 235$) as Fuel Element and Heavy Water as Moderator and Coolant. Report No. 11; PHYSIKALISCHE GESICHTSPUNKTE BEIM ENTWURF EINES FORSCHUNGS- REAKTORS MIT LEICHT ANGEREICHERTEM URAN (1,5% U*SUP 235/) ALS BRENNSTOFF UND SCHWEREM WASSER ALS MODERATOR UND KUHLMITTEL. Bericht Nr. 11

Werner, H. ; Rief, H. September 1957

Continuation of Report No. 9 (NP-6445). The physical parameters are tabulated. (J.S.R.)
EXPERIMENTS ON SUB-CRITICAL ASSEMBLIES OF ENRICHED URANIUM PLATES IN NATURAL WATER. PART I. THE LAPLACIANS OF 1/8" PLATE ASSEMBLIES

Barden, S.E. ; McCracken, A.K. May 1958

A series of exponential and approach to critical experiments were conducted using laplacians of uranium1.3 cobalt plntes 1/8 in. thick in natural water. A description of the approach technique and method of analyzing results is presented. The theory on which this analysis is bassd is described. (J.R.D.)

Title: CRITICAL EXPERIMENTS WITH 2.09% U$sup 235$-ENRICHED URANIUM METAL PLATES IN WATER

Abstract

Citation Formats

Critical experiments with 4. 31 wt % /sup 235/U-enriched UO/sub 2/ rods in highly borated water lattices

AN ANALYTICAL STUDY OF THE MINIMUM CRITICAL MASS OF HIGHLY ENRICHED $sup 235$U WHEN REFLECTED BY NATURAL URANIUM AND WATER MIXTURES IN OPTIMIZED LATTICES.

Criticality experiments with subcritical clusters of 2. 35 wt % and 4. 29 wt % /sup 235/U enriched UO/sub 2/ rods in water with uranium or lead reflecting walls

EXPERIMENTS ON SUB-CRITICAL ASSEMBLIES OF ENRICHED URANIUM PLATES IN NATURAL WATER. PART I. THE LAPLACIANS OF 1/8" PLATE ASSEMBLIES