The prediction of the property changes of structural materials, after service in a fusion reactor, is a key point for the technological development of this power source. The interaction of the fusion neutrons with the first wall, in particular, is a central problem. A comparison of neutron damage in different fusion fuel cycles is carried out. A comparison of some neutron damage phenomena at the first wall (transmutation rates, gas production, displacements) is performed, for a consistent set of three fusion reactor designs, based on different fuel cycles (DT, DD and DHe). Results for gas production (He and H) show that the rates are reduced of about five-seven times, passing from DT to DD conditions, and likewise passing from DD to DHe. Martensitic steels usually show a lower gas production rate than austenitic Results for steels and for some pure alloying elements are also reported. Nickel can be identified as the main responsible of the higher gas production in austenitic steels. Displacement rates are also calculated for steels. A comparison with fission is carried out: the fusion heavy operating conditions are put in evidence: even for DHe reactors, neutron damage phenomena remain higher than for fission. Results of neutron damage calculations performed by the author for different fusion DT devices are reported and discussed. In particular, results for an experimental low-fluence device (lgnitor), for ITER-EDA, and for the SEAFP plant model are compared.

Transmutation and gas production in first wall materials for fusion / Zucchetti, Massimo; Maizza, Giovanni. - STAMPA. - 1:(1996), pp. 629-637. (Intervento presentato al convegno INT. SYMPOSIUM ON MATERIAL CHEMISTRY IN NUCLEAR ENVIRONMENT tenutosi a Tsukuba nel March 14-15, 1996).

Transmutation and gas production in first wall materials for fusion

ZUCCHETTI, MASSIMO;MAIZZA, Giovanni
1996

Abstract

The prediction of the property changes of structural materials, after service in a fusion reactor, is a key point for the technological development of this power source. The interaction of the fusion neutrons with the first wall, in particular, is a central problem. A comparison of neutron damage in different fusion fuel cycles is carried out. A comparison of some neutron damage phenomena at the first wall (transmutation rates, gas production, displacements) is performed, for a consistent set of three fusion reactor designs, based on different fuel cycles (DT, DD and DHe). Results for gas production (He and H) show that the rates are reduced of about five-seven times, passing from DT to DD conditions, and likewise passing from DD to DHe. Martensitic steels usually show a lower gas production rate than austenitic Results for steels and for some pure alloying elements are also reported. Nickel can be identified as the main responsible of the higher gas production in austenitic steels. Displacement rates are also calculated for steels. A comparison with fission is carried out: the fusion heavy operating conditions are put in evidence: even for DHe reactors, neutron damage phenomena remain higher than for fission. Results of neutron damage calculations performed by the author for different fusion DT devices are reported and discussed. In particular, results for an experimental low-fluence device (lgnitor), for ITER-EDA, and for the SEAFP plant model are compared.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1654467
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