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This means half of the 48 reactors that use a pressurised water system could operate without the features for up to five years.
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The first is that the European pressurised water reactor (EPR) planned for Hinkley has turned out to be an engineering disaster.
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Jim Adams, 65, died when he was struck by a pressurised water pipe while working on the tunnel's Wilson Road site at Pennant Hills.
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The nuclear propulsion plant for the Vanguard's successor will be the more advanced Pressurised Water Reactor 3 (PWR3) system, the government said last year.
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The nuclear propulsion plant for the Vanguard successor will be the more advanced Pressurised Water Reactor 3 (PWR3) system, the government said last year.