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Takai, Shizuka; Takayama, Hideki*; Takeda, Seiji
JAEA-Data/Code 2016-020, 40 Pages, 2017/03
JAEA-Data-Code-2016-020.pdf:2.42MB
In this report, another group of scenarios for occurrence of earthquake at construction stage, operation stage and closure stage of disposal facility was presented. At first, we compiled information about damage cases of tunnel by earthquake and analyzed conditions for occurrence of damage. Base on this result and the previous report, information of influence of the accidents and human factors on safety functions and information of FEP about THMC variation, we specified events to be considered, which occur by earthquake and influence engineering barriers, natural barriers and long-term safety after closure stage of disposal facility. We compiled influence of the events on safety functions after closure stage of disposal and showed the chains of the influence on long-term safety as scenarios. These results were integrated as a database that could support development of scenarios caused by application of engineering technologies to geological disposal.
Takai, Shizuka; Takayama, Hideki*; Takeda, Seiji
JAEA-Data/Code 2015-018, 96 Pages, 2015/11
JAEA-Data-Code-2015-018.pdf:4.24MB
In the safety assessment for the high-level radioactive waste geological disposal, scenarios need to be developed in consideration of influence on barrier features by accidents and human factors caused by application of engineering technologies at each stage of site characterization, construction, operation and closure of disposal facility. To develop scenarios on application of engineering technologies from the point of view of safety regulation, deviation events which are deviated states of engineered and natural barriers from intended states were specified and possible evolution of features of barriers or loss/reduction of safety functions of barriers was shown as a scenario in JAEA-Data/Code 2014-026. In this study, we compiled information of existence of engineering measures against the accidents and human factors and deviation events, application performance and development status of the measures. From this information, we identified deviation events which need developing of engineering measures as remarkable deviation events. These results were integrated as a database that could support development of scenarios caused by application of engineering technologies to geological disposal.
Takayama, Hideki*; Takai, Shizuka; Takeda, Seiji
JAEA-Data/Code 2014-026, 189 Pages, 2015/02
JAEA-Data-Code-2014-026.pdf:8.03MB
In the safety assessment for the high-level radioactive waste geological disposal, scenarios need to be developed in consideration of influence on barrier features by applying engineering technologies at each stage of site selection, construction, operation and closure of disposal facility. To develop scenarios on application of engineering technologies from the point of view of safety regulation, it is important to grasp information of the engineering technologies which are possibly applied to geological disposal and to organize relationships between accidents and human factors caused by application of engineering technologies and influence by the factors on safety functions of engineered and natural barriers after closure stage. In this study, the engineering technologies are listed for site selection, construction, operation and closure activities at disposal site. From this information, "deviation events" which are deviated states of engineered and natural barriers from intended design were identified. We assumed influence on geological disposal facility due to the occurrence of the deviation events and identified the accidents and human factors which can progress the deviation events. Finally, we showed the sequence of influence by the accidents and human factors on long-term safety after closure of the disposal facility as scenarios. We provided a database with these results for development of scenario on engineering technology of geological disposal.
Takayama, Hideki; Takeda, Seiji; Kimura, Hideo
no journal, ,
no abstracts in English