Probabilities of inherent shutdown of unprotected events in innovative liquid metal reactors Page: 12 of 13
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Accordingly, the real risk associated with design phase uncertainties in
inherent shutdown is financial.
Finally, the work reported herein suggests that the probability of core
disruption in the innovative designs from the traditional unprotected LCF and
TOP may be so low that other reactor scenarios now become more risk-
significant. These include local faults, i.e. local failures or blockages,
being propagated into a core disruption accident; and sodium fires causing
sufficient loss of the heat removal and/or control system capability to
initiate an unprotected (or protected) event that eventually leads to core
disruption. Evaluations of these scenarios rendered them risk-insignificant
for CRBR and subsequent oxide designs and fuel and plant characteristics would
appear to make them even less of a problem for the innovative designs - e.g.
metal fuel-sodium compatibility should reduce the risk contribution of local
faults relative to that in the oxide case. Nevertheless, these scenarios must
be more carefully studied to determine their potential initiation frequencies
and consequences. To date no serious effort has been expended along these
lines.11
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Mueller, C.J. & Wade, D.C. Probabilities of inherent shutdown of unprotected events in innovative liquid metal reactors, article, January 1, 1988; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1061430/m1/12/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.