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I have not heard that one. For any design the water capacity is fixed by the size of the vessel and the external circuit. I suppose it may mean that when designing the plant it is best to have more volume available for the primary circuit than the minimum possible, so that there is more thermal capacity to absorb heat in some accident conditions. You are unlikely to want to build more volume into the pressure vessel itself as it would be expensive to do so. The above saying would also tie in with providing more primary/secondary loops, ie four instead of three, to provide better redundancy........ Or maybe it is a phrase from an old Saturday Night Live skit about some unqualified people left in charge of a nuclear reactor after being given the advice "Just remember, You can't put too much water in a nuclear reactor". (The joke is that they debate the two opposite meanings of the phrase).

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15y ago

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