PSAM 16 Conference Paper Overview
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Lead Author: Francesco Di Dedda Co-author(s): Anders Olsson, anders.olsson@vysusgroup.com
Thomas Augustsson, thomas.augustsson@okg.uniper.energy
| PSA implementation of the Independent Core Cooling and new EOPs/SAMGs at Oskarshamn 3 |
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| An independent core cooling function (OBH) has been installed in unit 3 at the Oskarshamn NPP as one of the post-Fukushima actions. In conjunction with the OBH project an update of the Emergency Operating Procedures (EOPs) has been made and a set of the Severe Accident Management Guidelines (SAMGs) has been developed. A complete review and validation of both level 1 and level 2 PSA sequences for all operating modes was performed to achieve the goal of implementing the new system functions and new procedures in the full scope analysis. Given the new system configuration, requirements on some systems affected the requirements on dependent systems functions. This interaction between different systems was challenging to assess in specific cases. Dedicated workshop activities with operating personnel were crucial to determine accident progression, especially when considering the new system functions and the manual actions according to the new EOPs/SAMGs. Changes in the electrical systems as well as the adoption of a new version the integral code MAAP and a new version of RiskSpectrum PSA software were also undertaken in the implementation. The modelling detail and realism has generally been increased in the "base-line PSA" (full power level 1 and 2, internal events) while other assumptions and simplifications are still present for other operating modes. The presentation will focus on the encountered challenges, how those were solved and on giving an overview on the updated results. |
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Author and Presentation Info
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