AnsaldoEnergia

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Divisione Nucleare Progetto Project PDS-XADS <strong>AnsaldoEnergia</strong> Identificativo Document no. XADS 20 TRIX 009 Rev. Rev. 1 Cl. ris. class Pagina Page 5 6.2.17 Low energy radioactive fluid system failure inside reactor containment ........122 6.3 SUMMARY OF REPRESENTATIVE EVENTS...........................................................122 7. SUMMARY AND CONCLUSIONS.........................................................................130 8. REFERENCES.......................................................................................................132 APPENDIX A – LIST OF INCIDENTAL AND ACCIDENTAL SITUATIONS FOR THE MYRRHA DESIGN.......................................................................................................133 DNU 020/1
Divisione Nucleare Progetto Project PDS-XADS <strong>AnsaldoEnergia</strong> Identificativo Document no. XADS 20 TRIX 009 Rev. Rev. 1 Cl. ris. class Pagina Page 6 1. SCOPE Primary goal of this document is to identify and categorize, by means of a systematic approach, all the "internal" initiating events (i.e. events that originate inside the facility) that lead to abnormal or accident conditions in the eXperimental Accelerator Driven System (XADS) and, subsequently, permit a selection of the representative events. The initiating events are identified and categorized basing on the Ansaldo XADS Reference Configuration [1]. It is underlined that, at the present time, limited technical information (or even almost no information) is available for some Ansaldo XADS systems; the detail of the analysis presented in the document is thus necessarily commensurate to the amount of available information. The representative events are defined as those that, for each category, have the most potential to challenge the integrity of the physical barriers between the radioactive isotopes and the external environment and hence to originate significant radioactivity releases to the external atmosphere. They will have to be analyzed in order to assess their consequences. The document does not address "external" events (i.e. events that originate outside the facility). The document includes, as Appendix A, also the MYRRHA initiating events. The initiating event list contains the DBC, DEC and the Residual Risk Situations for the MYRRHA concept. DNU 020/1
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