Astute Class Submarines

Defence written question – answered on 17th October 2012.

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Photo of Martin Horwood Martin Horwood Liberal Democrat, Cheltenham

To ask the Secretary of State for Defence

(1) whether design work has been carried out to modify the design of later submarines in the Astute class in order for them to be powered by PWR3 reactors;

(2) whether the seventh submarine in the Astute class will use a PWR2 or PWR3 reactor.

Photo of Philip Dunne Philip Dunne The Parliamentary Under-Secretary of State for Defence

The seventh Astute class submarine will be powered by Pressurised Water Reactor 2 (PWR2). No design work has been carried out to modify Astute class submarines in order for them to be powered by Pressurised Water Reactor 3 (PWR3), rather than PWR2. PWR3 is a new design that exploits technology that was not available when the Astute design was finalised.

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