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The transient thermal behaviour of a number of components, installed in the vessel of the world's largest fusion tokamak (JET) has been examined with a theoretical model, which simulated normal operational conditions and abnormal scenarios namely: loss of coolant flow; loss of torus vacuum; and combinations. A number of theoretical results related to water and cryogenically cooled devices have been validated by a comprehensive experimental campaign conducted both inside the JET plasma chamber and in a test rig. The performance of water cooled components which may be subjected to boiling or freeze-up risks in case of a loss of water flow event has also been analysed. A completely automatic safety protection system has been designed on the basis of these analyses and implemented in the routine JET operation.

Additional information

Authors: AGELADARAKIS P, JET Joint Undertaking, Abingdon, Oxon (GB);PAPASTERGIOU S, JET Joint Undertaking, Abingdon, Oxon (GB);O'DOWD N P, Imperial College, London (GB);WEBSTER G A, Imperial College, London (GB)
Bibliographic Reference: Report: JET-P(98)13 EN (1998) 21pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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