Fire design fundamental requirements

P(l) The fundamental requirements of fire design shall be as specified ... 

The Nuclear Safety Design Criteria for Fire Protection require the effective implementation of a fundamental fire protection philosophy known as "defense-in-depth". As applied to fire safety, this principle requires each faci I ity to achieve an adequate balance of each of the following elements ... 

Thus the reactor core must be designed in such a way that if it melts it cannot agglomerate into a closely packed lump. This is a fundamental design requirement, but it still leaves the possibility of an accident involving the melting of fuel, with probably a sodium fire at the same time. Since this could mean the release of the... 

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