Ex-core nuclear instrumentation system

摘要

The ex-core nuclear instrumentation system includes a key hole, and it is configured such that in the state where a key lock switch is inserted into the key hole, writing to a electrically rewritable nonvolatile memory is made valid by a general-purpose logic, and when writing to a electrically rewritable nonvolatile memory is in valid and the operation panel and the FPGA perform a serial communication and in a case where the data order of the serial communication is the predetermined data order, the CPU controls the electrically rewritable nonvolatile memory, and rewriting data, which is outputted from the operation panel, to the electrically rewritable nonvolatile memory is transmitted from the FPGA to the electrically rewritable nonvolatile memory so as to rewrite the data in the electrically rewritable nonvolatile memory.

主权项

1. An ex-core nuclear instrumentation system, comprising:
neutron detectors which measure neutron flux leaked from a reactor vessel and convert the neutron flux into a current value, a detector signal processing circuit which converts the converted current value into a voltage value, a signal processing card which performs arithmetic processing using a voltage value which is converted in the detector signal processing circuit so as to input the state of neutron flux during the operation of the reactor, and an operation panel having a man machine interface, wherein the signal processing card includes a CPU, a FPGA, an electrically rewritable nonvolatile memory and a key switch, wherein the signal processing card has general-purpose logic, which is connected directly to the key switch and controls a write signal of the electrically rewritable nonvolatile memory, that is configured to prevent the writing to electrically nonvolatile memory when a key is removed from the key switch, and when the key is engaged with the key switch the CPU retrieves rewrite data from the operation panel through the FPGA to the electrically rewritable nonvolatile memory to rewrite the data in the electrically rewritable nonvolatile memory.