Technical Data

1. REACTOR CORE

fuel-moderator material	8 wt% uranium 91 wt% zirconium 1 wt% hydrogen
uranium enrichment	19.8% Uran-235
fuel element dimensions	3.75 cm in diameter 72.24 cm in length
cladding	0.51 mm steel
active core volume	max. 49.5 cm diameter, 35.56 cm high
core loading	3 kg of uranium-235

2. REFLECTOR

material	graphite with aluminum cladding
radial thickness	30.5 cm
top and bottom thickness	10.2 cm

3. CONSTRUCTION

reactor shielding construction	heavy and standard concrete 6.55 m high, 6.19 m wide, 8.76 m long
reactor tank	1.98 m in diameter 6.40 m in depth

4. SHIELDING

radial:	30.5 cm of graphite; 45.7 cm of water 206 cm of heavy concrete
vertical:	above the core 4.90 m of water and 10.2 cm graphite; underneath the core 61.0 cm water, 10.2 cm graphite and at least 91 cm standard concrete

5. IRRADIATION DEVICES

(1) four beam holes 15.2 cm in diameter
(2) one central irradiation tube (center of core)
(3) five reflector irradiation tubes
(4) one pneumatic transfer system (near core edge)
(5) one thermal column with cross section 1.22x1.22 m and length 1.68 m
(6) experimental tank with surface area 2.44x2.74 m and depth 3.66 m;
connected to the reactor by means of a neutron radiography collimator
0.61x0.61 m in cross section and 1.22 m long.

6. CONTROL SYSTEM

Two boron carbide control rods with electric motor and rack and pinion drive.
One boron carbide pulse rod with compressed air drive (5 bar).
Maximum reactivity insertion rate - time rate of change (excluding pulse operation ): 0.04% δk/k per second
Total rod worth about 4.8% δk/k.

7. CHARACTERISTICS IN CONTINUOUS OPERATION

Thermal power output:	250 kW
Fuel element cooling:	natural convection of the tank water below 100 kW, pump circulation cooling above 100 kW
tank water cooling:	heat exchanger
thermal flux:	central irradiation tube: 1x10¹³cm^-2s^-1 in the irradiation tubes: 1.7x10¹² cm^-2s^-1
prompt temperature coefficient:	-1.2x10^-4 δk/k°C
mean prompt neutron lifetime:	6.0x10^-5 s.

8. EIGENSCHAFTEN BEIM IMPULSBETRIEB

peak power	250 MW
prompt pulse energy yield	10 MW s
prompt pulse lifetime	40 ms
total energy yield	12 MW s
minimal period	10 ms
maximum reactivity insertion	1.6% δk/k = 2$
maximum repetition frequency	12/h
number of fissions during a pulse	3x10¹⁷
maximum fuel temperature:	during the pulse 240 °C 9 seconds after the pulse 360 °C

9. BRIEF STATISTICAL DATA

average during last 5 years
power produced (MWh)	300
irradiation experiments	200
beam hole experiments	15
number of reactor pulses	10
number of visitors	2500