Core simulator

Instruments

Thermal power

3200MW

Reactivity

0.00$

Period

∞

Reactivity margin

30.0rods

Core void

57%

Hottest fuel

1162K

Xenon-135

1.00× eq.

Coolant flow

100%

ORM < 15

AR limit

Low flow

AZ-5

Prompt crit.

Fuel > 2200 K

Rupture

Core lost

Power recorder log scale, last 30 s of playback

AZ-5 · Emergency shutdownDrives every control rod into the core at 0.4 m/s. Rods start from the top with graphite displacers below the absorber, so the first seconds of travel add reactivity at the bottom of the core.

Operator controls

Automatic regulator 3200 MW

12 automatic rods hold power at this setpoint within their limited range.

Manual control rods40% in

185 rods. 0% means fully withdrawn above the core.

Shortened absorbers (from below)30% in

Main circulation pumps 6

Inlet subcooling14 °C

Below saturation at the channel inlet. Near zero, a little extra heat makes a lot of steam.

Time & view

Colour channels by

Slow orbit

Event log

About the model

Column height follows local thermal power. The physics is point kinetics with one delayed-neutron group (β = 0.5%, prompt generation time 0.8 ms) driven by per-channel steam void, fuel temperature (Doppler) and iodine-135 → xenon-135 poisoning. Steam void adds reactivity, as it did in the RBMK, and the effect is strongest at low power with coolant near boiling.

Coefficients are tuned so the 1986 sequence plays out qualitatively as described in IAEA INSAG-7. Numbers are illustrative, not a reconstruction of the plant.