FAST-FLUX MEASUREMENTS IN THE ORR CORE
The necessity for measuring the fast-neutron flux in beryllium irradiation studies led to mapping the fast flux in two positions of the ORR. The axial neutron flux distributions for thermal, 0.70 Mev, and 2.9 Mev, were measured using Co/sup 59/, Np/sup 237/, and S/sup 32/, respectively. The method s used in the manufacture of the flux monitors and the techniques used in making the measurements are described. Axialflux peaking in the ORR core occurs at about 3 in. below the reactor midplane. In the B-2 core position, the thermalflux peak is 9.5 x 10/sup 13/ neutrons/cm/sup 2/ - sec when the reactor is at 20 Mw. The maximum fast-flux values in B-2 are 8 x 10/sup 13/ neutrons/cm/ sup 2/ - sec (greater than 0.7 Mev) and 1.8 x 10/sup 13/ s neutrons/cm/sup 2/ - sec (greater than 2.9 Mev). In the B-8 position, maximum flux values were not measured. Observed fluxes were 1.4 x 10/sup 14/ neutrons/cm/sup 2/ - sec (greater than 0.7 Mev) and 2 x l0/sup 13/ neutrons/cm/sup 2/ - sec (greater than 2.9 Mev). (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-15-010578
- OSTI ID:
- 4085095
- Report Number(s):
- ORNL-3028
- Country of Publication:
- United States
- Language:
- English
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