This work is related to the application of the ECART code on the analysis of the tritium and dusts external releases for an in-vessel break in the helium cooling loop of the first wall / blanket in the Power Plant Conceptual Study (PPCS), taken as reference for accident scenarios in future fusion plants. In particular, the influence on the releases of a Detritiation System (DS) and of a dust scrubber with constant decontamination factor, not implemented in the original PPCS design, are analysed and proposed as mitigative design solutions. Furthermore, some parametrical analysis on the influence, on the external releases, of the mass fraction of the dust resuspended inside the VV at the beginning of the sequence have been also performed, highlighting the relevance of this phenomenology on the external releases. These analyses are the follow-up of previous studies about the phenomenological behaviour of the PPCS containment (vacuum vessel walls and expansion volume walls), giving the first indications on the amount of the external radioactive releases. The activities have been carried out in the general framework of the validation phase of the ECART code, initially developed for integrated analysis of severe accidents in LWRs, for its application on incidental sequences related to future fusion plants.
Analysis of the External Radioactive Releases for An In-Vessel Break in a Fusion Plant using the ECART Code
S. Paci
Primo
;
2019-01-01
Abstract
This work is related to the application of the ECART code on the analysis of the tritium and dusts external releases for an in-vessel break in the helium cooling loop of the first wall / blanket in the Power Plant Conceptual Study (PPCS), taken as reference for accident scenarios in future fusion plants. In particular, the influence on the releases of a Detritiation System (DS) and of a dust scrubber with constant decontamination factor, not implemented in the original PPCS design, are analysed and proposed as mitigative design solutions. Furthermore, some parametrical analysis on the influence, on the external releases, of the mass fraction of the dust resuspended inside the VV at the beginning of the sequence have been also performed, highlighting the relevance of this phenomenology on the external releases. These analyses are the follow-up of previous studies about the phenomenological behaviour of the PPCS containment (vacuum vessel walls and expansion volume walls), giving the first indications on the amount of the external radioactive releases. The activities have been carried out in the general framework of the validation phase of the ECART code, initially developed for integrated analysis of severe accidents in LWRs, for its application on incidental sequences related to future fusion plants.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
