Beam Shut-Off in ADS Accidents- An Essential Requirement (Invited Paper)
It is shown theoretically and with accident calculations that the only way to shut off an Accelerator-Driven System is to turn off the accelerator or block the proton beam. In Loss-of-Heat Sink accidents or in Loss-Of-Flow accidents in a system with low natural circulation capacity, or in a depressurisation accident in a gas-cooled system, shutting down the accelerator is of key importance in order to avoid a whole-core accident. Pb/Bi-cooled systems have the longest grace times (a few tens of minutes) for these potential whole-core accidents. For proton beam power increase or reactivity accidents there is the possibility of some pin failures already a few tens of seconds into the accident. However, if some fuel sweep-out from the core occurs, which is likely in the case of metallic coolants, the power will return to nominal but a tedious clean-up of the core will be needed. There is a need for fast acting passive devices to shut off the accelerator or block the proton beam.
Bibliographic Reference: An oral report given at: Global 2001. Organised by: Societe Francaise d'Energy Nucleaire and American Nuclear Society. Held in: Paris (FR), 9-13 September 2001
Record Number: 200013627 / Last updated on: 2001-07-30
Original language: en
Available languages: en