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New Nuclear Build - Economic Regulation

Reactors in the UK ? Experience to date. Generation I Magnox: 10 stations ? 9 different designs (plus another two exported!)Generation 2a AGR: 7 stations ? 4 designs, 3 design and construction consortiaGeneration 2b PWR: 1 station, derived from US design but extensively modified ? ends as very

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New Nuclear Build - Economic Regulation

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    1. New Nuclear Build - Economic Regulation?

    2. Reactors in the UK – Experience to date Generation I Magnox: 10 stations – 9 different designs (plus another two exported!) Generation 2a AGR: 7 stations – 4 designs, 3 design and construction consortia Generation 2b PWR: 1 station, derived from US design but extensively modified – ends as very much a ‘one of a kind’ Comment: 18 reactors, 14 designs only the near-identical Heysham 2 and Torness stations were built in parallel, and this proved very beneficial in minimising delays and improving construction efficiency

    3. Licensing Regime Safety licensing regime therefore developed to ‘cope with anything’ Permissioning regime based on Safety Assessment Principles (SAPs) Risk levels governed by Tolerability of Risk Safety improvement driven by So Far As is Reasonably Practicable (SFAIRP) within the framework of Tolerability of Risk

    5. ToR – Gross Disproportionality – Where to Stop? If Gross Disproportionality is to be bounded then the ‘Tolerable’ and ‘Broadly Acceptable’ regions need to be stabilised All the current signs point to erosion Nuclear site delicensing now relies on meeting 10-6 as a limit In the environmental field, guidance on BPM explicitly removes any thought of ‘valuing’ Gross Disproportionality

    6. ToR – Gross Disproportionality – Where to Stop?

    7. Licensing Regime and PWRs The UK licensing regime has only had one try at licensing an international design Sizewell B was an operating US design, and was examined ‘from the ground up’ Time pressures were not on the project team’s side – they gave in a lot! Sizewell ended up much more complex and expensive than its mother station – with many developments during the late stages of design and even during the build

    8. Licensing and Regulation – Sizewell B Took 14 Years to Plan and Build

    9. Any risk of a repetition = ‘no chance’ for new build!

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