Regional Basic Professional Training Course in Korea

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4. DESIGN OF NUCLEAR REACTORS
A third generating set is used to power the safety systems (ventilation, the control system
and the radiation monitoring system) should the two above‐mentioned generating sets
fail.
In the event of a total loss of power supply (EDF network and generating sets), the
reactor will automatically be shutdown by the safety rods dropping and the decay heat of
the core will be removed without difficulty by natural convection of water in the pool.
4.2.3.8. Safety considerations relating to experiments
The experimental devices in the OSIRIS reactor are generally intended for technological
irradiation of nuclear fuel or structural materials that are placed in or around the reactor
core.
The main types of experimental devices are:
Simple non‐instrumented devices, mainly used for the production of radioelements
or the doping of silicon.
Instrumented devices which generally have double‐wall containment; the coolant
fluid may be water, gas or NaK.
Fuel irradiation loops for different nuclear reactor types.
The fundamental principle to be applied to the above irradiation devices must include:
Taking every possible constructional measure to ensure that the total rupture of the
experimental device (rupture of its own barriers) does not jeopardise the safety
functions, particularly reactor shutdown and decay heat removal from the core.
Not separating the safety analysis of a specific configuration of the core relating to