Long-Term Operation of BWR RPV and Its Internals: Article PVP2018-84541

Otso Cronvall

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    This study concerns the long-term operation (LTO) of a boiling water reactor (BWR) reactor pressure vessel (RPV) and its internals. The main parts of this study are: survey on susceptibility to degradation mechanisms, and computational time limited ageing analyses (TLAAs). The ageing of nuclear power plants (NPPs) emphasises the need to anticipate the possible degradation mechanisms. The BWR survey on susceptibility to these uses the OL1/OL2 RPVs and significant internals as a pilot project. It is not necessary to carry out the TLAAs for all components. Some components were excluded from the TLAAs with a screening process. To do this, it was necessary to determine the component specific load induced stresses, strains and temperature distributions as well as cumulative usage factor (CUF) values. For the screened-in components, the TLAAs covered all significant time dependent degradation mechanisms. These include (but are not limited to): • irradiation embrittlement, • fatigue, • stress corrosion cracking (SCC), and • irradiation accelerated SCC (IASCC). For the components that were screened-in, the potential to brittle, ductile or other degradation was determined. Only some of the most significant cases and results are presented. According to the analysis results, the operational lifetime of the OL1/OL2 RPVs and internals can safely be extended from 40 to 60 years.

    Original languageEnglish
    Title of host publicationASME 2018 Pressure Vessels and Piping Conference
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Number of pages12
    ISBN (Electronic)978-0-7918-5170-8
    Publication statusPublished - 20 Jul 2018
    MoE publication typeNot Eligible
    EventASME 2018 Pressure Vessels and Piping Conference, PVP2018 - Hotel Hilton, Prague, Czech Republic
    Duration: 15 Jul 201820 Jul 2018
    Conference number: 52


    ConferenceASME 2018 Pressure Vessels and Piping Conference, PVP2018
    Abbreviated titlePVP2018
    Country/TerritoryCzech Republic


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