High temperature pebble bed reactor and process for shut-down

Details High temperature pebble bed reactor and process for shut-down High temperature pebble bed reactor and process for shut-down

1984-09-28

1987-12-15

Kyle, Deborah L.

Induced nuclear reactions: processes, systems, and elements

With control of reactor

By movement of control element or by release of neutron...

376244, 376299, G21C 708

Patent

active

047132116

ABSTRACT:
A high temperature pebble bed nuclear reactor having a medium power capacity of 300 to 500 MW.sup.e is equipped with two different shut-down arrangements comprising reflector rods used exclusively for scram. The total shut-down reactivity of the reflector rods is proportioned in order to prevent the excessive cooling of the reactor core folowing scram. In this manner, the reactor core is rendered subcritical (in the event of accidents, for example, or at the beginning of any operating state) yet capable of returning to criticality at a reduced level of temperature and power output following the removal of heat. The use of all of the reflector rods for scram is effected only in the event of reactivity accidents. For all other scram incidents, only a portion of the reflector rods are used.

REFERENCES:
patent: 2812303 (1957-11-01), Daniels
patent: 4148685 (1979-04-01), Brandes
patent: 4382908 (1983-05-01), Petersen
patent: 4486380 (1984-12-01), Schweiger et al.

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