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Scoping calculations considering potentially severe accident initiators have been performed for a fast subcritical and accelerator-driven reactor with sodium or lead cooling. These have shown that massive coolant disturbances such as loss-of-flow or loss-of-heat-sink events can lead to whole-core damage if the accelerator beam is not switched off in time. Strong reactivity or beam power increases could at most lead to limited core damage if the proton beam continues to generate neutrons in the core. Thus, the switching off or interruption of the accelerator beam is similar to the insertion of control rods in a critical reactor. Active and more or less complex passive approaches are considered to switch off the accelerator or interrupt the proton beam. Loss-of-coolant accidents pose no significant safety problem and decay heat removal by natural circulation is easier with a metal coolant.

Additional information

Authors: WIDER H U, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Annual Meeting on Nuclear Technology, München (DE), 26-28 May 1998
Availability: Available from (1) as Paper EN 41441 ORA
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