CN110033874B - Nuclear instrument system RPN3 phi threshold automatic adjustment method based on FirmSys platform - Google Patents
Nuclear instrument system RPN3 phi threshold automatic adjustment method based on FirmSys platform Download PDFInfo
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- CN110033874B CN110033874B CN201910299640.XA CN201910299640A CN110033874B CN 110033874 B CN110033874 B CN 110033874B CN 201910299640 A CN201910299640 A CN 201910299640A CN 110033874 B CN110033874 B CN 110033874B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
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- G21D3/00—Control of nuclear power plant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method for automatically adjusting a nuclear instrument system RPN3 phi threshold based on a FirmSys platform, which comprises the following steps: when the unit goes down, the automatic adjustment of the 3 phi threshold value is completed by the internal control logic; when the unit goes upward, adding manual intervention of an operator to complete the adjustment of the 3 phi threshold; when the machine set is down and the 2.8 × current RPN source range count rate is less than the 3 Φ threshold, the 3 Φ threshold is automatically triggered to be adjusted, and the automatically modified 3 Φ threshold is 2.5 × current RPN source range count rate. Therefore, the method for automatically adjusting the RPN3 phi threshold of the nuclear instrument system based on the FirmSys platform greatly reduces the frequency of manual adjustment, improves the working efficiency of 3 phi threshold adjustment and reduces the risk of human errors.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a method for automatically adjusting a nuclear instrument system RPN3 phi threshold value based on a FirmSys platform.
Background
The 3 phi (phi is the normal neutron counting rate during shutdown) in an RPN (nuclear instrumentation) nuclear instrument system refers to a high neutron flux alarm during source range shutdown, is a control means for controlling the insertion depth and boron concentration dilution of a control rod, is an important means for controlling the reactivity during the reactor startup and shutdown process, and is used for prompting operators to intervene in the reactor condition in time. The threshold is adjusted according to the requirements of the core security. As shown in fig. 1, for the 3 Φ fixed value adjustment, the downlink fixed value is set to 2 Φ, and the adjustment is performed when 3 Φ is reached; and setting the uplink timing value to be 3 phi, and adjusting when the uplink timing value reaches 2 phi. For example, when the nuclear power plant unit moves downwards, Φ is 1500c/s, the fixed value should be 3000c/s, when the nuclear power plant unit continues to move downwards, Φ is 1000c/s, the fixed value of 3 Φ needs to be adjusted to 2000c/s again, and so on, and similarly when the nuclear power plant unit moves upwards.
At present, the specific implementation process of the 3 phi threshold adjustment is manually controlled, the state of a unit is judged by an operator, according to the counting rate of an RPN nuclear instrument system, an instrument control worker is informed to enter a site to be matched with the instrument control worker to adjust the 3 phi threshold, the 3 phi threshold adjustment is manually completed by the instrument control worker, the instrument control worker needs to enter a safety-level DCS engineering configuration to modify parameters, the adjustment frequency is about 30 times/each overhaul, and the implementation process has the following risks:
1. if the 3 phi threshold is adjusted too high or too low, the requirements of the operation technical specifications are violated (monitoring of the subcritical state of the unit is influenced and alarm is triggered by mistake);
2. if the adjustment is frequently carried out, the loading and material changing work is influenced, and the overhaul period is delayed;
3. frequently logging in a security level DCS platform, modifying internal configuration parameters, and if the modification is wrong, causing equipment misoperation, and if the modification is serious, causing the trip and pile jump;
4. the work is executed by instrument control and cooperation, and the risks of human error and communication failure exist;
5. the working time has high uncertainty, about 30 times per overhaul, the daily temporary stop frequency is very high, most of the starting and stopping are arranged at night, so the adjustment is also carried out at night, the human error risk is greatly increased, and the input labor cost is too high.
The RPN nuclear instrument system realizes the function of continuously measuring and monitoring the nuclear power of the reactor, the adjustment of the 3 phi threshold value is realized by the cooperation of instrument control personnel of a power plant and operating personnel at present, the adjustment completely depends on manual judgment and operation, the instrument control personnel are required to frequently enter a safety-level DCS configuration for parameter modification, the required time window is strict, the input labor cost is too high, the safe and stable operation of a unit is seriously influenced, and the economic benefit of the unit is reduced.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a method for automatically adjusting a nuclear instrument system RPN3 phi threshold based on a FirmSys platform, which can greatly reduce the frequency of manual adjustment and reduce the risk of human errors.
In order to achieve the aim, the invention provides a method for automatically adjusting a nuclear instrumentation system RPN3 phi threshold based on a FirmSys platform, which comprises the following steps: when the unit goes down, the automatic adjustment of the 3 phi threshold value is completed by the internal control logic; when the unit goes upward, adding manual intervention of an operator to complete the adjustment of the 3 phi threshold; when the machine set is down and the 2.8 × current RPN source range count rate is less than the 3 Φ threshold, the 3 Φ threshold is automatically triggered to be adjusted, and the automatically modified 3 Φ threshold is 2.5 × current RPN source range count rate.
In a preferred embodiment, when the unit is running upwards, the operator judges the RPN count rate state and adjusts the RPN count rate state by manually triggering the 3 Φ threshold.
In a preferred embodiment, when the current RPN source range count rate does not satisfy the condition of 2 × current RPN source range count rate ≦ 3 Φ threshold ≦ 3 × current RPN source range count rate, the operator manually triggers the 3 Φ threshold to adjust.
In a preferred embodiment, the internal control logic automatically modifies the current RPN source range count rate to 2.5 x 3 Φ threshold upon operator command.
In a preferred embodiment, the method for automatically adjusting the nuclear instrumentation system RPN3 phi threshold based on the FirmSys platform further comprises introducing a 3 phi threshold adjustment control interface into a main control operation page of the nuclear instrumentation system.
Compared with the prior art, the method for automatically adjusting the RPN3 phi threshold of the nuclear instrument system based on the FirmSys platform can greatly reduce the frequency of manual adjustment, improve the working efficiency of 3 phi threshold adjustment, reduce the risk of human errors, cannot influence the loading and changing work, cannot delay the overhaul period, reduces the investment of labor cost, saves the resources of a power plant, and is beneficial to improving the economic benefit of the power plant.
Drawings
FIG. 1 is a logic flow diagram of the steps of a conventional manual 3 φ threshold adjustment.
FIG. 2 is a logic flow diagram of the steps of a method for automated adjustment of a FirmSys platform based nuclear instrumentation RPN3 Φ threshold in accordance with an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 2, according to a method for automatically adjusting the threshold value of the nuclear instrumentation system RPN3 Φ based on the FirmSys (nuclear safety level instrumentation and control system) platform according to a preferred embodiment of the present invention, the frequency of manual adjustment can be greatly reduced, the risk of human error is reduced, the loading and material change work is not affected, and the overhaul period is not delayed.
In order to achieve the aim, the invention provides a method for automatically adjusting a nuclear instrumentation system RPN3 phi threshold based on a FirmSys platform, which comprises the following steps: when the unit goes down, the automatic adjustment of the 3 phi threshold value is completed by the internal control logic; when the unit goes upward, adding manual intervention of an operator to complete the adjustment of the 3 phi threshold; when the machine set is down and the 2.8 × current RPN source range count rate is less than the 3 Φ threshold, the 3 Φ threshold is automatically triggered to be adjusted, and the automatically modified 3 Φ threshold is 2.5 × current RPN source range count rate.
In a preferred embodiment, when the unit goes up, an operator judges the RPN counting rate state and adjusts the RPN counting rate state by manually triggering a 3 phi threshold; and when the current RPN source range counting rate does not satisfy the condition that the current RPN source range counting rate is not more than 2 and the current RPN source range counting rate is not more than 3 phi and the threshold value is not more than 3 and the current RPN source range counting rate is not more than 3 phi, the operator manually triggers the 3 phi threshold value to adjust.
In a preferred embodiment, the internal control logic automatically modifies the current RPN source range count rate to 2.5 x 3 Φ threshold according to the operator's command; the method for automatically adjusting the RPN3 phi threshold of the nuclear instrument system based on the FirmSys platform further comprises the step of introducing an adjusting control interface of the 3 phi threshold into a main control operation page of the nuclear instrument system.
In practical application, the method for automatically adjusting the RPN3 phi threshold of the nuclear instrument system based on the FirmSys platform introduces the 3 phi adjustment control interface into a main control operation interface by modifying the implementation logic of the 3 phi threshold adjustment in the RPN control logic, is completed by internal logic in the down-line of a unit, and adds certain manual intervention of an operator for ensuring that the source range does not exceed the limit value in the up-line of the unit. The method realizes the automatic adjustment of the RPN3 phi threshold, and the specific realization method and the principle are as follows:
1. the automatic adjustment function: according to the RPN source range counting rate, when the current counting rate is 2.8 times less than the threshold value of 3 phi, the threshold value of 3 phi is automatically triggered to modify, and the alarm constant value is automatically modified to be 2.5 times of the current counting rate;
2. manual modify fixed value function: the alarm constant value can be manually updated by the main control room. And the operator judges the RPN counting rate condition according to the unit state, when the current counting rate does not satisfy the condition that the current counting rate is not more than 2 and the current counting rate is not more than 3 and the threshold value is not more than 3, the operator manually triggers the modification of the 3 phi threshold value, and the control logic automatically modifies the 3 phi threshold value to be 2.5 of the current counting rate according to the command of the operator.
The detailed technical detail scheme is as follows:
if K1 × K2 × QNSF < HQNS1, HQNS1 ═ MAX (K2 × QNSF, VALMIN), that is, the alarm value is changed to K2 times the current count rate, and the minimum alarm value is not lower than VALMIN;
HQNS1 (MAX (K2 × QNSF, VALMIN), the alarm set value can be manually modified to K2 times the current count rate. And the minimum alarm value is not lower than VALMIN.
Wherein, QNSF is the counting rate after the source range filtering, and the default initial value K1 is 1.12, and K2 is 2.5, which is an adjustable coefficient; VALMIN is the lowest alarm fixed value, the default initial value is 30cps (neutron counting rate), and the parameters are adjustable; the 3 Φ threshold is HQNS 1.
Meanwhile, the display function of the 3 phi threshold fixed value HQNS1 is realized on a power station computer information and control system, and the display function is used for monitoring the real-time condition of the 3 phi threshold by an operator in a main control room.
In conclusion, the method for automatically adjusting the RPN3 phi threshold of the nuclear instrument system based on the FirmSys platform has the following beneficial effects:
1. frequent communication between operating personnel and instrument control personnel is not needed, and the risk of communication failure does not exist;
2. the risk that the 3 phi adjustment is too high or too low does not exist, the monitoring of the subcritical state of the unit is not influenced, and the false triggering of the alarm is caused;
3. the working efficiency of 3 phi threshold adjustment is improved, the frequency of manual adjustment is greatly reduced, the risk of human errors is reduced, the loading and material changing work is not influenced, and the overhaul period is not delayed;
4. the safety level DCS platform does not need to be logged in, the internal configuration parameters do not need to be modified, and the state safety of other equipment cannot be influenced, so that the risk of tripping the machine and the pile is caused;
5. the investment of labor cost is reduced, the resources of the power plant are saved, and the economic benefit of the power plant is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (5)
1. A method for automatically adjusting a nuclear instrumentation system RPN3 phi threshold based on a FirmSys platform is characterized by comprising the following steps:
when the unit goes down, the automatic adjustment of the 3 phi threshold value is completed by the internal control logic;
adding manual intervention of an operator to complete adjustment of the 3 phi threshold when the unit ascends;
when the unit descends and the 2.8 times current RPN source range counting rate is less than a 3 phi threshold value, the 3 phi threshold value is automatically triggered to be adjusted, and the automatically modified 3 phi threshold value is 2.5 times current RPN source range counting rate.
2. The method for automatically adjusting the RPN3 phi threshold of the nuclear instrumentation system based on the FirmSys platform as claimed in claim 1, wherein when the unit is moving upwards, the operator judges the state of the RPN counting rate and manually triggers the 3 phi threshold to adjust.
3. The method for automated nuclear instrumentation system RPN3 Φ threshold adjustment based on the FirmSys platform of claim 2, wherein the operator manually triggers the 3 Φ threshold for adjustment when the current RPN source range count rate does not satisfy the condition of 2 x current RPN source range count rate ≦ 3 Φ threshold ≦ 3 x current RPN source range count rate.
4. The method for automated tuning of a FirmSys platform based nuclear instrumentation system RPN3 Φ threshold as recited in claim 3, wherein said internal control logic automatically modifies the 3 Φ threshold to 2.5 x current RPN source range count rate upon command by said operator.
5. The method for automated tuning of a FirmSys platform-based nuclear instrumentation system RPN3 Φ threshold value of claim 1, further comprising importing the 3 Φ threshold tuning control interface into a master operations page of a nuclear instrumentation system.
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