Training reactor VR-1

Basic reactor paramerters and instrumentation

Nominal power
1 kW thermal, 5 kW thermal for a short period
type IRT-4M, enrichment 19.7 % U-235
Reactor vessels
made from stainless steel
   - diameter
2300 mm
   - height
4720 mm
   - wall thickness
15 mm
   - bottom thickness
20 mm
Reactor shielding
light water and heavy concrete
   - vertical
approx. 3000 mm of water
   - horizontal
approx. 850 mm of water + 950 mm heavy concrete
Temperature in reactor
approx. 20 °C (i.e. ambient temperature)
Reactor cooling
natural convection only
Neutron source
Am-Be, 185 GBq
Control system
5-7 absorbing (control) rods UR-70 with cadmium
Power measurement
four wide-range fission chambers RJ 1300 for neutron detection
Power protection
four pulse boron chambers SNM-12 for neutron detection
Neutron flux
depends on fuel configuration and type of experiment (average values)
   - thermal neutrons
approx. 2.10*9 n/cm2.s-1 in centre of the core
   - fast neutrons
approx. 1.10*9 n/cm2.s-1 in centre of the core
Experimental equipment
most important reactor experimental instrumentation:
- radial horizontal channel of diameter 200 mm
- tangential horizontal channel of diameter 100 mm
- vertical channels of various diameters (56, 32, 25 and 12 mm)
- beryllium and graphite blocks
- pneumatic dispatch (rabbit) for irradiation of small samples
- delayed neutron detection device
- device for study of void reactivity coefficient
- device for study of reactor dynamics
- device for measuring of activity of wire-shaped samples
- TLD device for study of gamma fields

© DNR FNSPE CTU in Prague, 2017