Power Monitoring System

Abstract

The power monitoring system has: a local power range monitor (LPRM) unit that has a plurality of local power channels to obtain local neutron distribution in a nuclear reactor core; an averaged power range monitor (APRM) unit that receives power output signals from the LPRM unit and obtains average output power signal of the reactor core as a whole; and an oscillation power range monitor (OPRM) unit that receives the power output signals from the LPRM unit and monitors power oscillations of the reactor core. The output signals from the LPRM unit to the APRM unit and the output signals from the LPRM unit to the OPRM unit are independent.

1 . A power monitoring system comprising:
 a local power range monitoring device that has a plurality of local power channels to obtain local neutron distribution in a nuclear reactor core;   an averaged power range monitoring device that receives power output signals from the local power range monitoring device and obtains average output power signal of the reactor core as a whole; and   an oscillation power range monitoring device including an oscillation power range monitoring mechanism that receives the power output signals from the local power range monitoring device and monitors power oscillations of the reactor core, wherein   output signals from the local power range monitoring device to the averaged power range monitoring device and output signals from the local power range monitoring device to the oscillation power range monitoring device are independent.   
     
     
         2 . The power monitoring system according to  claim 1 , wherein,
 in the oscillation power range monitoring mechanism, variables that are changed according to type of fuel of the reactor core are formed by a combination of electrical contacts that are so positioned as not to be operated without stopping the oscillation power range monitoring mechanism.   
     
     
         3 . The power monitoring system according to  claim 1 , wherein,
 in the oscillation power range monitoring mechanism, variables that are changed according to type of fuel of the reactor core cannot be changed without stopping the oscillation power range monitoring mechanism, and are stored in an element whose internal state cannot be changed by operation of the oscillation power range monitoring mechanism.   
     
     
         4 . The power monitoring system according to  claim 1 , wherein
 when at least one of a plurality of the local power channels of the local power range monitoring device breaks down, corresponding local power channel is excluded.   
     
     
         5 . The power monitoring system according to  claim 1 , wherein
 the oscillation power range monitoring mechanism has a transmission section that transmits output signals not having input signals in a one-way direction, and the transmission section transmits the output signals to a state display section that displays state of power oscillations.   
     
     
         6 . The power monitoring system according to  claim 1 , wherein
 the oscillation power range monitoring mechanism has a transmission section that transmits output signals not having input signals in a one-way direction, and the transmission section transmits the output signals to a history recording device that records a predetermined period of time of the past history.   
     
     
         7 . The power monitoring system according to  claim 6 , wherein
 the history recording device includes: a determination means that makes a determination as to whether data is normally received; and a determination result transmission means that transmits the determination result of the determination means to the transmission section, wherein the transmission of data from another oscillation power range monitoring mechanism to the transmission section is limited to one-way transmission.   
     
     
         8 . The power monitoring system according to  claim 6 , wherein
 the transmission section and the history recording device are electrically isolated.   
     
     
         9 . A power monitoring system comprising:
 a local power range monitoring device that has a plurality of local power channels to obtain local neutron distribution in a nuclear reactor core;   an averaged power range monitoring device that receives power output signals from the local power range monitoring device and obtains average output power of the reactor core as a whole; and   an oscillation power range monitoring device including an oscillation power range monitoring mechanism that receives the power output signals from the local power range monitoring device and monitors power oscillations of the reactor core, wherein   the averaged power range monitoring device transmits output signals from the local power range monitoring device to the oscillation power range monitoring device with the output not passing through an averaged power range monitor processing function in the averaged power range monitoring device.   
     
     
         10 . The power monitoring system according to  claim 9 , wherein,
 in the oscillation power range monitoring mechanism, variables that are changed according to type of fuel of the reactor core are formed by a combination of electrical contacts that are so positioned as not to be operated without stopping the oscillation power range monitoring mechanism.   
     
     
         11 . The power monitoring system according to  claim 9 , wherein,
 in the oscillation power range monitoring mechanism, variables that are changed according to type of fuel of the reactor core cannot be changed without stopping the oscillation power range monitoring mechanism, and are stored in an element whose internal state cannot be changed by operation of the oscillation power range monitoring mechanism.   
     
     
         12 . The power monitoring system according to  claim 9 , wherein
 when at least one of a plurality of the local power channels of the local power range monitoring device breaks down, corresponding local power channel is excluded.   
     
     
         13 . The power monitoring system according to  claim 9 , wherein
 the oscillation power range monitoring mechanism has a transmission section that transmits output signals not having input signals in a one-way direction, and the transmission section transmits the output signals to a state display section that displays state of power oscillations.   
     
     
         14 . The power monitoring system according to  claim 9 , wherein
 the oscillation power range monitoring mechanism has a transmission section that transmits output signals not having input signals in a one-way direction, and the transmission section transmits the output signals to a history recording device that records a predetermined period of time of the past history.   
     
     
         15 . The power monitoring system according to  claim 14 , wherein
 the history recording device includes: a determination means that makes a determination as to whether data is normally received; and a determination result transmission means that transmits the determination result of the determination means to the transmission section, wherein the transmission of data from another oscillation power range monitoring mechanism to the transmission section is limited to one-way transmission.   
     
     
         16 . The power monitoring system according to  claim 14 , wherein
 the transmission section and the history recording device are electrically isolated.   
     
     
         17 . A power monitoring system comprising:
 a local power range monitoring device that has a plurality of local power channels to obtain local neutron distribution in a nuclear reactor core; and   an averaged power range monitoring device that receives power output signals from the local power range monitoring device and obtains average output power of the reactor core as a whole, wherein   the averaged power range monitoring device includes an averaged power range monitor processing mechanism and an oscillation power range monitoring mechanism, and an input from the local power range monitoring device to the averaged power range monitor processing mechanism is independent of an input from the local power range monitoring device to the oscillation power range monitoring mechanism.   
     
     
         18 . The power monitoring system according to  claim 17 , wherein,
 in the oscillation power range monitoring mechanism, variables that are changed according to type of fuel of the reactor core are formed by a combination of electrical contacts that are so positioned as not to be operated without stopping the oscillation power range monitoring mechanism.   
     
     
         19 . The power monitoring system according to  claim 17 , wherein,
 in the oscillation power range monitoring mechanism, variables that are changed according to type of fuel of the reactor core cannot be changed without stopping the oscillation power range monitoring mechanism, and are stored in an element whose internal state cannot be changed by operation of the oscillation power range monitoring mechanism.   
     
     
         20 . The power monitoring system according to  claim 17 , wherein
 when at least one of a plurality of the local power channels of the local power range monitoring device breaks down, corresponding local power channel is excluded.