Purpose of the development: Receiving of a neutron spectrum with average energy of 1.1 MW.

Recommended application field: An unit allows to carry out research, radiation tests of electronic engineering elements; neutron-activation elemental analysis of samples in agriculture, geology, ecology, agricultural chemistry and biology; trace, macroelements, ultra-microelements, and toxic analysis of soils; determine oxygen concentration in monocrystals, films, and radiobiology with accuracy of up to 0.001 %; develop a guarantee system in the sphere of non-proliferation; detect explosives and drugs. The unit can be employed for training scientific manpower of highest qualification in the fields of nuclear physics and nuclear power engineering.

Technical characteristic: Neutron generating target " Material: Pb Booster (zone 1) " Number of fuel elements: 132 " U235 fuel enrichment, %: 90 " Average neutron energy, MeV: ~ 1.1 Booster (zone 2) " Number of fuel elements: 576 " Average neutron energy, MeV: 0.7-0.8 " Average neutron flux density, neutron / (cm2*s): ~ 109 " Neutron multiplication constant in booster zone: 0.6 Thermal zone " Moderator: polyethylene " Number of fuel elements: ~ 1080-1100 " Average neutron flux density, neutron / (cm2*s): ~ 109 Radial reflector " Thickness, mm: graphite: 250, borated polyethylene: 50 Face reflector " Thickness of the borated polyethylene, mm: 100

Advantages over analogues: Optimization calculations for the booster subcritical assembly controlled by a high-intensity neutron generator resulted in achievement of: " most optimal parameters for the core zone, including geometrical dimension of the zones " material composition of the fuel " uranium content (enrichment) of different zones " lattice spacing for fuel elements with 90.36 and 10 % enrichment uranium the experimental measurements confirmed existence of an unilateral neutron coupling between the booster and thermal zones of the subcritical assembly. The theoretical values of effective multiplication factors for the booster (kbef ~ 0.6) and thermal zones (ktef ~ 0.945), as well as for the entire assembly (kef < 0.98), have been obtained.

The development stage readiness: The working documentation is developed

Description of the development:
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Fields of neutrons of last and thermal spectra with flux densities of 109 neutron / (cm2*s) are formed in the unit. The evaluation of primary reactivity effects of the unit demonstrated its high safety degree. The unit is capable of operating in a strongly subcritical mode (k2 %). Though a number of conceptual developments of booster subcritical systems exist at present, pilot units of this type have not yet been created.

Possibility of transfer abroad:
Licence's sale
Technological document's sale
Combinated reduction to industrial level

Photo

Country Belarus

For additional information turn to:
E-mail: gal@uintei.kiev.ua