Method for automatically adjusting RPN3[fai] threshold value of nuclear instrument system based on FirmSys platform

Abstract

The invention discloses a method for automatically adjusting an RPN3[fai] threshold value of a nuclear instrument system based on a FirmSys platform. The method comprises the steps that when a unit descends, an internal control logic completes automatic adjustment of the 3[fai] threshold value, and when the unit ascends, an operator is added to manually intervene and complete the adjustment of the3[fai] threshold value, wherein when the unit descends and the product of 2.8 and a current RPN source range counting rate is smaller than 3[fai] threshold value, the 3[fai] threshold value is automatically triggered for adjustment, and the automatically modified 3[fai] threshold value is equal to the product of 2.5 and the current RPN source range counting rate. Therefore, according to the method for automatically adjusting the RPN3[fai] threshold value of the nuclear instrument system based on the FirmSys platform, the manual adjustment frequency is greatly reduced, the working efficiency of 3[fai] threshold value adjustment is improved, and the risk of human errors is reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a method for automatically adjusting the RPN3Φ threshold of a nuclear instrumentation system based on the FirmSys platform. Background technique [0002] In the RPN (Nuclear Instrumentation) nuclear instrumentation system, 3Φ (Φ is the normal neutron count rate during shutdown) refers to the high neutron flux alarm during the shutdown of the source range, which is the dilution of the insertion depth of the control rod and the concentration of boron. A control method is an important means to control the reactivity during the start-up and shutdown of the reactor, and is used to prompt the operating personnel to intervene in the reactor situation in time. According to the requirements of nuclear safety, the threshold should be adjusted. Such as figure 1 As shown, for the 3Φ fixed value adjustment, the fixed value is set to 2Φ when going down, and adjusted when it reaches 3Φ;...

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Problems solved by technology

[0004] 1. If the 3Φ threshold is adjusted too high or too low, it will violate the requirements of the operating technical specifications (affecting the monitoring of the subcritical state of the unit and causing false triggering of the alarm);

[0005] 2. Mistakes in frequent adjustments will affect the refueling work and delay the overhaul period;

[0006] 3. Frequently log in to the security-level DCS platform to modify the internal configuration parameters. If the modification is wrong, the device will malfunction, and in serious cases, it will cause the machine to jump to the stack;

[0007] 4. The work is carried out with the cooperation of instrumentation and control, and there are risks of human error and communication failure;

[0008] 5. The working hours are highly uncertain, about 30 times per overhaul, and the frequency of daily temporary shutdown is also very high, and most of the start-up and shutdown are arranged at night, so the adjustment also needs to be carried out at night, which greatly increases the risk of human error. And the labor cost is too high

[0009] The RPN nuclear instrumentation system realizes the continuous measurement and monitoring of the nuclear power of the reactor. The 3Φ threshold adjustment is currently implemented by the instrumentation and control personnel of the power plant in cooperation with the operating personnel. The adjustment depends entirely on human judgment and operation, and requires the instrumentation and control personnel to frequently enter the safety level. Modification of parameters in DCS configuration requires a strict time window and high labor cost, which seriously affects the safe and stable operation of the unit and reduces the economic benefits of the unit

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