Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Transient monitor for nuclear reactor










Image Number 5 for United States Patent #4678622.

A monitored nuclear reactor parameter, such as a startup range neutron monitoring signal, is filtered at a filter having a preselected time constant and amplified with the output being passed to one channel of a two channel comparator. The level of the amplification and the filter time constant are chosen to discriminate between normally increasing startup neutron density including the prompt-jump effect and exponentially increasing neutron density due to the occurrence of reactor casualty in view of the design parameters of the reactor. This same startup range neutron monitoring signal is passed unprocessed to the other channel of the two channel comparator. Comparison of the two signals is made with the binary output of the comparator flagging excess of the unprocessed signal over the filtered and amplified signal. Presence of the appropriate reactor flag is typically used to cause rod withdrawal blockage and/or SCRAM. The time constant of the filter causes the monitored neutron density signal to be delayed in its tracking of reactor startup. The level of amplification of the monitored neutron density signal establishes the reference level in the comparator which when exceeded sets the comparator flag. Consequently, comparator response time varies inversely with the severity of increase in neutron density. Preferably a first amplification level is used for determining rod withdrawal block and a second and higher level of amplification is used for plant SCRAM comparators. A dynamic display to the operator of comparison between monitored neutron density and the dynamically tailored trip levels is provided.








 
 
  Recently Added Patents
Mobility management in a communications system
Method and device for managing a turning setpoint applied to at least one turning actuator for the rear wheels of an automobile
Output queued switch with a parallel shared memory, and method of operating same
Method and apparatus of communication using soft decision
Organic semiconductor compound, semiconductor device, solar cell and producing method of organic semiconductor compound
Lens barrel and imaging device
Signal generator
  Randomly Featured Patents
Thermosettable prepolymers prepared from heterocyclic materials having alkyl substituents, mono- or dianhydrides, ethylenically unsaturated materials and a hydroxide, carbonate or bicarbonate
Expandable chamber having combined occupant support and heating
Wireless communication game system
Digital frequency comparator circuit
Detection of ischemia
Brushless exciter protection circuit
Blood processing apparatus with cell separation chamber with baffles
Spark-prevention coating for oxygen compressor shroud
Bicycle chain lubrication
Microcapsule composition for electrophoretic displays