SEDL / STP / STP850-EB / STP32684S

Equalization of Axial Neutron Flux Density for the Transmutation Doping of Silicon in a Heavy Water Reactor

Andresen, K
manager of NTD silicon productionhead of Isotope Divisionstaff member of Reactor Physics Division, Risø National Laboratory, Roskilde,

Heydorn, K
manager of NTD silicon productionhead of Isotope Divisionstaff member of Reactor Physics Division, Risø National Laboratory, Roskilde,

Nonbøl, E
manager of NTD silicon productionhead of Isotope Divisionstaff member of Reactor Physics Division, Risø National Laboratory, Roskilde,

Pages: 10    Published: Jan 1984

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Abstract

New irradiation facilities for the neutron transmutation doping of silicon crystals with a diameter of up to 110 mm have been installed in the Danish heavy-water reactor DR 3. Cross-sectional uniformity is easily achieved by rotation, but axial variation is affected by different reactor operating conditions. A computer program has been developed as an aid in designing a stainless steel absorber that limits the maximum deviation with a minimum reduction of the average neutron fluence. Comprehensive experimental verification has been carried out to ascertain the quality of the NTD silicon within close specifications.