Author/Authors :
Taylor، نويسنده , , N.P and Ikeda، نويسنده , , Y and Bartels، نويسنده , , H.-W and Cambi، نويسنده , , G and Cepraga، نويسنده , , D.G. and Cheng، نويسنده , , E.T and Forrest، نويسنده , , R.A and Iida، نويسنده , , H and Khater، نويسنده , , H.Y and Maekawa، نويسنده , , F and Saji، نويسنده , , G and Santoro، نويسنده , , R.T and Sawan، نويسنده , , M.E and Sublet، نويسنده , , J.-Ch and Youssef، نويسنده , , M.Z، نويسنده ,
Abstract :
In a D-T fusion tokamak, neutron activation of structural material will result in a source of heat from radioactive decay after shutdown of the plasma. Although relatively small, in certain postulated loss-of-cooling accidents this decay heat could drive a temperature transient of modest proportions. In safety studies of the International Thermonuclear Experimental Reactor (ITER), such accident scenarios are analysed for their possible consequences, requiring an accurate knowledge of the level and time-dependence of the decay heat in components in which it is significant. This is calculated by activation modelling using computer codes with libraries of nuclear data. This paper describes an international benchmark activity to validate several of these codes and data, using the results of direct measurements of decay heat in ITER-relevant materials after exposure to a flux of 14 MeV neutrons. The results show consistency between the codes and, when using data from the recently-compiled FENDL/A-2 activation data library, good agreement with the experiments over the time-scales of interest in ITER safety studies.
