Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – By particular instrumentation circuitry
Patent
1985-08-20
1987-07-07
Cangialosi, Salvatore
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
By particular instrumentation circuitry
376216, 376217, 376254, 376255, G21C 1700
Patent
active
046786228
ABSTRACT:
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.
REFERENCES:
patent: 3330954 (1967-07-01), Cox et al.
patent: 3931522 (1976-01-01), Rusch
patent: 4133039 (1979-01-01), Eichenlaub
patent: 4292129 (1981-09-01), Barry
patent: 4434132 (1984-02-01), Cook
patent: 4493811 (1985-01-01), Seki et al.
Chao Fred C.
Rowe William S.
Cangialosi Salvatore
General Electric Company
James, Jr. Ivor J.
Simkins Raymond G.
LandOfFree
Transient monitor for nuclear reactor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transient monitor for nuclear reactor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transient monitor for nuclear reactor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1661767