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Workreport 2017-30



FMEA for Barrier Production and Disposal Processes -Quality Non-Conformance Identification


Karvonen, T.



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Posiva Oy is preparing the application for the operating licence for the spent nuclear fuel geologic disposal facility in Olkiluoto. The disposal facility design, construction, operation, and closure as well as the quality control system aim at implementing the facility according to the planned design and corresponding design requirements. It is recognised, however, as implied also by STUK's YVL Guide D.5, A04, that it is possible that undetected quality non-conformances remain in the disposal facility after closure. For the safety case for the operating licence application (SC-OLA), these potential undetected quality non-conformances (i.e. deviations) that could detrimentally affect the initial state of disposal facility were identified using the Failure Mode and Effects Analysis (FMEA) method. The method and results are presented in this report.

The FMEA method was applied to fuel transport and encapsulation, canister manufacture and operations to disposal, buffer manufacture and installation, backfill manufacture and installation, closure manufacture and installation, and repository underground openings construction phases. In the FMEA process, the detailed production steps of all the components were reviewed systematically and their potential failure modes and effects on the planned design were identified. The process was implemented as a series of expert elicitation workshops, to which the experts were selected according to their experience in various phases of production, transport or installation of the different components. The aim of the work was to identify potential failure modes that could result in deviations to the planned initial state of the components. Occupational hazards and cost effects were excluded from FMEA.

The identified potential failure modes and their effects are summarized at a general and qualitative level in the body in this report and the full FMEA results are included in the Appendixes (2-13, restricted distribution). More elaborate descriptions of undetected deviations to the initial state will be added to Initial State report of the SC-OLA. These failure modes are screened according to the method presented in this report and grouped according to the components' long-term performance targets described in the TURVA-2012 Design Basis report.


Failure mode and effects analysis, FMEA, deviation, non-conformity, quality, initial state, safety case


WR 2017-30_web (pdf) (1.5 MB)


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