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Additional info for Nuclear Power - Operation, Safety and Environment
6 The multidisciplinary problem associated with the FC-BLOCKAGE scenario The background for addressing the multidisciplinary problem arising from the FCBLOCKAGE and the MPTR include the presentation of following aspects: 44 Nuclear Power – Operation, Safety and Environment Table 3. Realized nodalizations study of the components and zones of the RBMK core region to make clear the concerned accident scenario, the characterization of the steady state operation of the reference RBMK boiling channel, the experience from the pressure tube (PT) rupture events in RBMK NPP, the phenomenological evolution of the transient.
Adopted numerical codes Cocosys and Relap5 Contain and Relap5 Korsar-Bars Relap53D©/Nestle Relap5-Ansys Katran-UStack Contain & Relap5 FluentAnsys Korsar-Rapta Cocosys Melcor Relap5 Reasons for the selection Challenging core cooling and the neutron kinetics model of the thermal-hydraulic system codes Check of the capability of the 'ECCS bypass' to cool the core Challenging the venting capability of the reactor cavity (part of the confinement) Challenging the ALS (part of the confinement) structural resistance (same as A1) Challenging the reactor building (part of the confinement) venting capability (same as A2) Challenging the calculation of the local fission power generation (same as D1) To assess and to understand the local core response (same as A4) Challenging RIA (Reactivity Initiating Event) Driving accident for the study.
The technological areas (for deterministic safety analysis) include the system thermalhydraulics, the computational fluid-dynamics, the structural mechanics, the neutron kinetics with the cross section generation and the fission product release and transport. Integrated Approach for Actual Safety Analysis 43 Fig. 5. 4 The nodalizations Nodalizations were developed for both Western and Russian codes by modelling the materials and components, by making reference to the technological areas and by considering the features of codes with the target of demonstrating codes capability and suitability, but also to assess the integrity of the fission product barriers.