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PROCEEDINGS OF A SYMPO - IAEA Nuclear Data Services

PROCEEDINGS OF A SYMPO - IAEA Nuclear Data Services

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IA E A -S M -170/5 3 33<br />

Temperature, °K<br />

F IG . 1 2 . C o m p o s itio n o f h y d r o g e n -u r a n iu m p la sm a at pressure o f 5 00 a tm o s p h e r e s. M ix in g r a tio = 1 :1 [ 3 2 ] .<br />

In contrast to conditions in solid-core reactors, the fuel in plasma<br />

core reactors has such a short residence time in the core that a portion of<br />

the delayed neutrons do not contribute to criticality. According to [28]<br />

there are more delayed neutrons in the low-energy region than previously<br />

assumed. These are competing effects whose relative contributions to<br />

criticality computations require more attention. Special analysis of the<br />

delayed neutron spectrum appears to be in order.

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