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Latest News
Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
P.R. Thomas, V.P. Bhatnagar
Fusion Science and Technology | Volume 33 | Number 2 | March 1998 | Pages 407-424
Special Lectures | doi.org/10.13182/FST98-A11947033
Articles are hosted by Taylor and Francis Online.
JET experimental results directly relevant to ITER design are presented. From recent experiments in DT mixtures varying from 100:0 to 10:90, it is inferred that an inverse mass dependence should be included in the H-mode power threshold scaling. Using ITER similarity experiments, the global energy confinement time in JET discharges with type I ELMs is found to be consistent with the gyro-Bohm physics form which has no dependence on plasma β. This form has a weak negative mass dependence but a stronger density dependence than the ITERH93-P scaling. Using the JET MkIIa pumped divertor with N2 seeding, ITER-relevant highly radiative regimes (PR up to 75%) accompanied by type III ELMs have been studied. It is found that the confinement degrades progressively with increasing radiative power fraction. Power loading of divertor tiles with type I ELMs appears to be excessive with NBI whereas it is less of a concern with ICRH. Preliminary assessement of the ITER reference second harmonic (2ɷCT) ICRH scenario with and without the addition of a small amount of He3 is also presented. High performance optimised shear discharges with potentially ‘well aligned’ bootstrap current scenarios consistent with ITER-relevant steady-state operation have also been studied. Internal transport barriers featuring peaked plasma profiles have been demonstrated in DT plasmas in JET. Preliminary results of α-particle driven toroidal Alfven eigenmodes (TAEs) in the ‘after-glow’ of NBI heated 50:50 DT plasmas are also presented.