| 摘要 |
A beam pipe (46) for guiding in an accelerator-driven nuclear system an accelerated particle beam (44) through a coolant in a primary vessel (12) on to a spallation target (30) comprises, preferably near its tip end (48), a temperature triggered flooding device, including for example a melt-rupture disc. In case of an abnormal temperature increase in the system, the temperature triggered flooding device establishes, below the normal coolant level (16), a flooding communication between the vessel (12) and the interio r of the beam pipe (46), thereby flooding the interior of the beam pipe (46) with the coolant (14) contained in the vessel (12).
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