Method for automatic adjustment of rpn3φ threshold value of nuclear instrumentation system based on firmsys platform

Abstract

The invention discloses a method for automatic adjustment of the RPN 3Φ threshold of a nuclear instrumentation system based on the FirmSys platform, which includes: when the unit goes down, the internal control logic completes the automatic adjustment of the 3Φ threshold; when the unit goes up, manual intervention is added to complete the 3Φ threshold Adjustment; among them, when the unit goes down and 2.8*current RPN source range count rate<3Φ threshold, the 3Φ threshold is automatically triggered for adjustment, and the automatically modified 3Φ threshold=2.5*current RPN source range count rate. Thus, the method for automatic adjustment of the RPN3Φ threshold of the nuclear instrumentation system based on the FirmSys platform of the present invention greatly reduces the frequency of manual adjustment, improves the work efficiency of 3Φ threshold adjustment, and reduces the risk of human error.

Description

Technical field [0001] The present invention relates to the field of nuclear technology, particularly, to a nuclear instrument based on the system platform FirmSys RPN3Φ automatic threshold adjustment method. Background technique [0002] RPN (Nuclear Instrumentation) Nuclear Instrumentation System 3 [phi (Φ during normal shutdown of neutron count rate) refers to a neutron flux source range high alarm during shutdown, a control rod insertion depth of the boron concentration and dilution a means of control, is an important means of reactor start-stop pile during the course of reactivity control and operating personnel for prompt timely intervention of a reactor. The nuclear safety requirements, to adjust its threshold. like figure 1 As shown in, for 3 [phi adjustment value, set the value to 2 [phi] downlink, when adjusted to achieve 3Φ; 3Φ, adjustment 2 [phi] reaches the predetermined value is set to row. For example, a nuclear power plant unit downlink Φ = 1500c / s, the set valu...

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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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