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Skyshine Shielding Experiments

#0517


Experimental Studies of Reactor Radiation Scattering in the Atmosphere.

Tech Area / Field

  • FIR-EXP/Experiments/Fission Reactors

Status
8 Project completed

Registration date
28.12.1995

Completion date
02.06.1999

Senior Project Manager
Tocheny L V

Leading Institute
Federal State Unitary Enterprise Research and Development Institute of Power Engineering named after N.A.Dollezhal, Russia, Moscow

Supporting institutes

  • National Nuclear Center of the Republic of Kazakstan / Institute of Atomic Energy (2), Kazakstan, Kurchatov

Collaborators

  • JAERI / Tokai Research Establishment, Japan, Tokai Mura

Project summary

Experimental studies of the levels of neutron and gamma radiation scattered by the atmosphere (air) are carried out using a specialized research reactor (RR) sited in Kazakhstan on a proving ground near Semipalatinsk.

At nuclear facilities (nuclear district heating plants, nuclear cogeneration plants, etc.) located in close vicinity to residential areas the emergencies can occur in the course of repair or refuelling work, as a result, the considerable fluxes of neutron and gamma radiation can go upward and beyond the buiding to the atmosphere and become a source of radiation exposure for people on adjacent territory owing to the fluxes scattering in the air. Meanwhile, biological shield and building structures decrease sideward radiation levels to the background opes. Therefore, for purposes of experimental simulation RR was chosen, its tank being almost entirely deepened in the ground, where the possibility to increase sky shining for reliable detection of scattered radiation at a distance of up to 1 km from the source is available.

In the process of experimental studies of scattered radiation component the differential energy spectra of neutrons and gamma radiation in a wide range of energies, spatial distributions of fast, intermediate and thermal neutrons fluxes, neutron and gamma radiation dose rates will be measured. State-of-the-art experimental and calculation methods will be employed, their validity being validated and reported at international seminars and conferences. Studies of air scattered radiation will be conducted under perse weather conditions. Goudiness, pressure, humidity and temperature of the air, soil moisture content will be recorded. Quantitative ratios correlating the functionals of released and scattered radiation for different weather conditions and at sufficiently long distances from the source are to be obtained for the first time for operating reactor radiation sky shining in the air. The results achieved will permit prompt assessments of radiation situation as a a result of scattered radiation, reduction of costs of analytical and experimental substantiation of radiation and environmental safety of nuclear facilities

The project suggested will permit alternative employment of researchers and engineers engaged in the development of nuclear reactors for space and military programmes, reactors of special-purpose marine nuclear power plants for about two years.

Participation of researchers from Japan in the works dealing with analytical substantiation of experimental results is anticipated. Cooperation with researchers from Japan will help scientists and engineers from CIS countries to choose new fundamental or applied trends in civil use together with international scientific community.


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