Speed-of-Control Considerations

The second safety control criterion is a restatement of the Hanford Speed-of-Control Criterion. Since the water-loss accident in N Reactor does not result in a rapid increase in reactivity as is the case in the present reactors, the accident 

Secondly, there is the case where the control rods are withdrawn at their maximum rate (or reactivity is added by some other means -- cold water accident, for exaoqpie) and the primary safely system (safety rods) fall to enter the reactor. Chis is a more Improbable accident (two failtires or accidents are required), and the requirement that the backup system i esponse must meet is set at no fuel melting. No fuel melting in this case meaxis no iranlum melting. 

In order to assess the degree to which the safety systems meet both these speed-of-control requirements, it is first necessary to consider the sources and mag nltudes of the reactor excursions Then, peurtlcular exciursions are examined to determine whether the criteria are indeed satisfied. 

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Inoperable Ball Column Limit 1 6 Total Control Considerations 1 7 Speed of Control Considerations... 

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