One out of two reactor protection system meets maintenance bypass device
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A technology for reactor protection and maintenance bypass, which is applied to the control of reactors and nuclear reactions, and the reduction of greenhouse gases. benefit effect
Active Publication Date: 2017-10-13
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology
[0006] During the operation of the reactor, the unplanned shutdown caused by the failure of the safety monitoring device reduces the operability of the reactor. The behavior and measures of canceling one or more equipment functions in the protection system, that is, maintenance bypass. In the prior art, no relevant information has been found
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Embodiment 1
[0030] Such as Figure 1 to Figure 4 shown.
[0031] One out of two of the reactor protection system complies with the maintenance bypass device,
[0032] Including the reactor protection system, the reactor protection system includes a safety monitoring device A located in channel A, a safety monitoring device B located in channel B, a safety logic device A located in channel A, and a safety logic device B located in channel B , safety monitoring device A outputs protection signal A1, protection signal A2, safety monitoring device B outputs protection signal B1, protection signal B2, safety logic device A receives protection signal A1, protection signal B1, safety logic device B receives protection signal A2 , protection signal B2;
[0033] Including 1 / 2 logical bypass unit, 1 / 2 logical bypass unit includes rotary switch S with three gear contacts, rotary switch S has 0 gear contacts, 1 gear contacts, 2 gear contacts, The action knife contact of the rotary switch S is conn...
Embodiment 2
[0040] On the basis of Embodiment 1, preferably, since the selection of the bypass signal contact in the above system is randomly selected, there are two signal contacts on the output circuit of the same relay selected in the implementation After gathering, the bypass signal contact is formed. Therefore, if the relay fails, the output circuit of the relay cannot be closed, so the bypass process cannot be performed. At this time, the bypass system is unreliable. Therefore, in order to avoid the occurrence of the above-mentioned situation, the present invention adopts the following circuit setting scheme, that is, select a signal contact in the output circuit of any relay, and then select a contact in the output circuit of another relay, and connect the two signals The contacts are collected to form a bypass signal contact. After this setting, the purpose of increasing the stability of the bypass signal can be achieved. Even if one relay fails, the bypass signal contact composed ...
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Abstract
The invention discloses a reactor protection system with one out of two conforming maintenance bypass devices, including a reactor protection system including a 2/3 logical bypass unit, and a 2/3 logical bypass unit including a rotary switch S with four gear contacts , 2/3 logic bypass unit also includes 12 relays, 12 relays are normally open relays, every 4 of the 12 relays is a group, the input terminals of the input circuit of the first group of 4 relays are connected To the 1st gear contact, the input ends of the input circuits of the 4 relays in the second group are all connected to the 2nd gear contact, and the input ends of the input circuits of the 4 relays in the third group are all connected to the 3rd gear contact. By setting the bypass device between the safety monitoring device and the safety logic device, the maintenance bypass function of the protection system is increased. Realize online maintenance and testing of equipment, reduce the probability of unplanned shutdown due to equipment failure, improve the operability of the reactor, and ensure production efficiency.
Description
technical field [0001] The invention relates to a safety control technology of a reactor protection system, and in particular relates to a two-out-one coincident maintenance bypass device for the reactor protection system. Background technique [0002] The overall upper 2 / 3 (two out of three) channel combination of the emergency shutdown unit of the reactor protection system, each safety logic channel combination adopts a partial 2 / 3 conforming structure, composed of a three-channel safety logic device and an emergency shutdown circuit breaker The multi-channel overall 2 / 3 conforms to the structure. [0003] The signals monitored by the safety monitoring device are composed of 24 protection input signals of four signal types: nuclear measurement parameters, process measurement parameters, protection system equipment status and system power supply status. The 24 kinds of protection signals sent to the safety logic device are composed of two partial coincidence modes of "2 / 3 ...
Claims
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