58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
import pytest
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from reactor_sim.neutronics import NeutronDynamics
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from reactor_sim.state import CoreState
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def _core_state(
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temperature: float = 950.0,
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flux: float = 2e7,
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burnup: float = 0.01,
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power: float = 500.0,
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) -> CoreState:
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return CoreState(
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fuel_temperature=temperature,
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neutron_flux=flux,
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reactivity_margin=0.0,
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power_output_mw=power,
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burnup=burnup,
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)
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def test_reactivity_increases_with_rod_withdrawal():
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dynamics = NeutronDynamics()
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state = _core_state()
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rho_full_out = dynamics.reactivity(state, control_fraction=0.0)
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rho_half = dynamics.reactivity(state, control_fraction=0.5)
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assert rho_full_out > rho_half
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def test_poisons_accumulate_under_power():
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dynamics = NeutronDynamics()
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state = _core_state(power=800.0, flux=1e6)
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dynamics.update_poisons(state, dt=100.0)
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dynamics.update_poisons(state, dt=100.0)
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assert state.iodine_inventory > 0.0
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assert state.xenon_inventory > 0.0
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def test_xenon_penalty_caps():
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dynamics = NeutronDynamics()
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state = _core_state()
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state.xenon_inventory = 50.0
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assert dynamics.xenon_penalty(state) == 0.05
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state.xenon_inventory = 0.2
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assert dynamics.xenon_penalty(state) == pytest.approx(0.01)
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def test_delayed_precursors_follow_rod_banks():
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dynamics = NeutronDynamics()
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state = _core_state(power=600.0, flux=5e6)
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dynamics.step(state, control_fraction=0.2, dt=1.0, rod_banks=[0.2, 0.2, 0.2])
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initial_sum = sum(state.delayed_precursors)
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assert len(state.delayed_precursors) == 3
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assert initial_sum > 0.0
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dynamics.step(state, control_fraction=0.95, dt=2.0, rod_banks=[0.95, 0.95, 0.95])
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assert sum(state.delayed_precursors) < initial_sum
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