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Conference Papers Year : 2018

Exploratory risk analysis of ITER Cask et Plug Remote Handling System

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Abstract

An exploratory risk analysis of ITER Cask et Plug Remote Handling System (CPRHS) has been performed while using an approach integrating all dimensions to be considered when the CPRHS is in various operational states with the associated possible loads.A Functional Breakdown Structure was developed from the 4 main functions to be fulfilled by the CPRHS to dock, to handle, to transport and to confine. During maintenance operations, various operating states and locations were defined. In regard to the safety function, to confine, specific configurations were considered to capture all relevant loading cases.A Failure Mode Effects et Criticality Analysis could then be made by identifying potential failures of all basic functions to be fulfilled by CPRHS during the maintenance of a Diagnostic Port Plug (PP) and quantifying them in terms of Criticality (C) defined as the product of the failure Occurrence (O) and Severity (S). The Severity rating scale was related to unavailability of the function due to both technical and safety issues.Specific analyses of docking operations in the different cells and traveling in different rooms while taking into account the safety constraints were made leading to recommend actions for mitigating the failures having the highest criticality levels. CPRHS availability and operations time were estimated while considering the impact of the failure modes and the benefit of mitigation actions.In order to statistically estimate the duration of repairing, the failure modes of CPRHS basic functions were introduced in the schedule Primavera Risk Analysis software which uses a probabilistic Monte Carlo approach. The failure modes were considered as task dependent activities with a duration equal to Mean Time To repair (MTTR) and an existence likelihood equal to the product et61548; x DC where et61548; is the failure rate and DC is the Duty Cycle of the failed basic function.
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Dates and versions

cea-02339286 , version 1 (30-10-2019)

Identifiers

  • HAL Id : cea-02339286 , version 1

Cite

D. van Houtte, A. Claisse, D. Elbeze, Jp. Friconneau, C. Lacroix, et al.. Exploratory risk analysis of ITER Cask et Plug Remote Handling System. SOFT2018 (Symposum On Fusion Technology), Sep 2018, Giardini, Italy. ⟨cea-02339286⟩

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