The original emphasis in the design and operation of EBR-II was to demonstrate a complete breeder-reactor power plant with on-site reprocessing of metallic fuel.
42.
Changing ( increasing or decreasing ) the flow of water through the core is the normal and convenient method for controlling power from approximately 30 % to 100 % reactor power.
43.
When reactor power is decreased or shut down by inserting neutron absorbing control rods, the reactor neutron flux is reduced and the equilibrium shifts initially towards higher 135 Xe concentration.
44.
For a while 135 Xe builds up, governed by the amount of available 135 I, then its concentration decreases again to an equilibrium for the given reactor power level.
45.
Since water weakly absorbs neutrons ( and the higher density of liquid water makes it a better absorber than steam ), turning on additional pumps decreased the reactor power further still.
46.
During synchronization with the new protection equipment, one of the two turbo groups inadvertently increased the load, and this caused a rise in reactor power to 12.6 %.
47.
The burn rate is proportional to the neutron flux, which is proportional to the reactor power; a reactor running on twice the power will have twice the xenon burn rate.
48.
The normal coolant flow is 8000 m?/ h per pump; this is throttled down by control valves to 6000 7000 m?/ h when the reactor power is below 500 MWt.
49.
The PPDDCS is designed to maintain reactor power density distribution between 10 and 120 % of nominal levels and to control the total reactor power between 5 and 120 % of nominal levels.
50.
The PPDDCS is designed to maintain reactor power density distribution between 10 and 120 % of nominal levels and to control the total reactor power between 5 and 120 % of nominal levels.
