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Nuclear power plant over-temperature and over-power protection temperature difference signal processing method
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A signal processing and nuclear power technology, applied in nuclear power generation, power plant safety devices, nuclear engineering, etc., to achieve the effects of improving safety and economy, ensuring accuracy, and ensuring effectiveness
Active Publication Date: 2014-06-18
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology
[0013] For nuclear power plants using digital technology, since the transmission signals in the measurement channel are actual values, not electricity, the temperature difference signal calibration algorithm suitable for analog technology nuclear power plant commissioning tests is no longer suitable for digital nuclear power plants
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Embodiment 1
[0038] 1) When the nuclear power is increased to 75% FP, the temperature difference signal of the main circuit is the average temperature difference measured by n times.
[0039]
[0040] Among them, (ΔT 75 ) i When the nuclear power rises to 75% FP, the temperature difference signal of the main circuit has been measured n times, and the temperature difference value of each measurement;
[0041] 2) Determine the average power (P 75 ) 平均
[0042]
[0043] Among them, (P 75 ) i When the nuclear power rises to 75% FP, the temperature difference signal of the main circuit has been measured n times, and the nuclear power value of each measurement;
[0044] 3) Use the following formula to determine the temperature difference signal at full power (ΔT 100 ) e
[0045]
[0046] Among them, K' is the nonlinear change coefficient of enthalpy.
[0047] 4) Use the following formula to determine the temperature difference calibration gain coefficient A when the nuclear po...
Embodiment 2
[0053] 1) Confirm that the nuclear power rises to 100% FP, and the temperature difference signal of the main circuit is the average temperature difference measured by n times.
[0054]
[0055] Among them, (ΔT 100 ) i When the nuclear power rises to 100% FP, the temperature difference signal of the main circuit has been measured n times, and the temperature difference value of each measurement;
[0056] 2) Determine the average power (P 100 ) 平均
[0057]
[0058] Among them, (P 100 ) i When the nuclear power rises to 100% FP, the temperature difference signal of the main circuit has been measured n times, and the nuclear power value at each measurement;
[0059] 3) Use the following formula to determine the average value (ΔT 100 ) e
[0060]
[0061] At this time, K' is 1;
[0062] 4) Determine the temperature difference calibration gain coefficient A when the nuclear power rises to 100% FP
[0063] A = 100 ...
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Abstract
The invention belongs to a nuclear powerplant reactor coolantsystemprocess measurement technology, and specifically discloses a nuclear powerplant over-temperature and over-power protection temperature differencesignalprocessing method. According to the present invention, a main circuit temperature differencesignal requiring calibration is collected, the average value and the power average value are utilized to obtain a temperature difference calibration gain coefficient so as to calibrate the measured main circuit temperature difference signal; and during debugging, when a heat power is increased to 75%F-100%FP, a temperature difference signal calibration channel sets a calibration factor, such that operators can easily and visually compare the temperature difference signal values before and after calibration, accuracy of channel calibration is ensured, effectiveness of the over-temperature and over-power reactor trip protection function is ensured, and safety and economy of the nuclear powerplant are increased.
Description
technical field [0001] The invention belongs to the process measurement technology of a power plant reactor coolantsystem, and in particular relates to a temperature difference signal processing method. Background technique [0002] In nuclear power plants, the reactor protection system sets over-temperature ΔT and over-power ΔT protection channels to protect the safety of the core and prevent fuel damage under category I conditions (normal operation and operating transient conditions are not expected to occur) and category II Under operating conditions (the reactor can be transferred to a safe state after the accident, only a small part of the fuel elements are damaged, and the radioactivity released in the accident should not pose a threat to the public), the core deviates from nucleate boiling (DNB) and the center of the fuel rod melts . The over-temperature ΔT protection is used to protect the core to prevent DNB; the over-power ΔT protection is used to protect the cor...
Claims
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