CN106448759B - Effectiveness detection method for automatic control system of nuclear power station heater - Google Patents
Effectiveness detection method for automatic control system of nuclear power station heater Download PDFInfo
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- CN106448759B CN106448759B CN201610911428.0A CN201610911428A CN106448759B CN 106448759 B CN106448759 B CN 106448759B CN 201610911428 A CN201610911428 A CN 201610911428A CN 106448759 B CN106448759 B CN 106448759B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/003—Remote inspection of vessels, e.g. pressure vessels
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention belongs to the technical field of nuclear power station safety, and relates to an effectiveness detection method for an automatic control system of a nuclear power station heater. The method is characterized in that a test loop is additionally arranged outside a normal working loop of a conventional heating control system, and under the condition that the heating system has test conditions, the switching between the normal working loop and the test loop is realized through the manual switching of a selector switch, so that the validity is detected. The method for detecting the effectiveness of the conventional heating control system of the nuclear power station is simple and easy to implement, low in cost and high in efficiency, and improves the effectiveness of the heating control system and the safety level of the operation of the nuclear power station.
Description
Technical Field
The invention belongs to the technical field of nuclear power station safety, and relates to an effectiveness detection method for an automatic control system of a nuclear power station heater.
Background
Safety injection systems are important safety-specific systems in nuclear power plants. When a reactor has an accident, concentrated boric acid solution is rapidly injected into a reactor coolant system to compensate volume change and reactivity increase caused by overcooling of the reactor coolant, so that the reactor can be rapidly and safely shut down.
The safety injection system was equipped with a boric acid injection chamber containing 7000-, 9000ppm of high concentration boric acid. In order to prevent the crystallization of the boric acid, two thermometers of an A column and a B column are respectively arranged on the boric acid injection box, and the temperature change of the boric acid injection box is monitored in real time. The temperature signal is collected in a digital display for threshold processing. For the column A digital display instrument, the high and low threshold values are respectively set to 65 ℃ and 60 ℃; for the column B digital display instrument, the high and low thresholds are set to 60 ℃ and 55 ℃ respectively. The signal after threshold processing is used for controlling the start and stop of the heater. When the temperature threshold reaches a low set value, triggering a heater to start, and heating the boric acid injection box; when the temperature is higher than the low threshold and lower than the high threshold, the heater continues to heat under the holding action of the RS trigger. And when the temperature threshold reaches a high set value, triggering the heater to stop, and stopping heating the boric acid injection tank.
According to the setting of temperature thresholds of the A column and the B column, when the temperature reaches 60 ℃, the heater of the A column is started; the heater activation in column B is triggered only when the temperature reaches 55 c. When the power station is in actual operation, the temperature of the boric acid injection box is not continuously reduced to 55 ℃ generally after the heaters in the A row are started, so that the heaters in the B row are in a standby state for a long time. If the heating control system of the B row fails, the operator of the power station cannot easily perceive the failure, and when the working condition that the temperature of the boric acid injection box is too low (lower than 55 ℃) occurs, the heater of the B row cannot be started due to the failure, so that the boric acid injection box cannot be heated and the temperature is too low, and the crystallization of the boric acid is caused. If the safe injection system is put into operation at this moment, boric acid is precipitated and cannot be injected into a primary loop, so that the positive reaction of the reactor cannot be inhibited, and the operation safety of the power station is seriously influenced. Therefore, it is important to periodically test the effectiveness of the heating control system in column B.
Disclosure of Invention
The invention aims to provide an effectiveness detection method of an automatic control system of a heater of a nuclear power station aiming at the requirement of safety design of the nuclear power station, which is simple and easy to implement, low in cost and high in efficiency, and improves the effectiveness of the heating control system and the safety level of operation of the nuclear power station.
In order to achieve the purpose, the invention provides a method for detecting the effectiveness of an automatic control system of a heater of a nuclear power station, which is characterized in that a test loop is additionally arranged outside a normal working loop of a conventional heating control system, and the normal working loop and the test loop are switched through manual switching of a selector switch under the condition that the heating system has test conditions, so that the effectiveness is detected.
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power plant heater, further, the test loop simulates a temperature signal through a sliding resistor, configures different temperature signals by utilizing the adjustability of the sliding resistor, triggers the temperature threshold value,
when the temperature reaches a low threshold value, the control system triggers the heater to start;
when the temperature is higher than the low threshold and lower than the high threshold, the heater is kept heating under the action of the control system;
when the temperature reaches a high threshold value, the control system triggers the heater to stop working,
if the sequence control is not realized, the heating control system is proved to have obstacles and needs to be overhauled.
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power plant heater, and further the control system realizes the function of maintaining a control signal through an RS trigger. A
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power plant heater, and further, the control loop is connected in series with a digital display instrument which displays a temperature signal value converted after signal processing is carried out on the resistance value of the sliding resistor.
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power plant heater, further, the automatic control system of the heater is an automatic control system of a nuclear power plant safety injection system heater, and the conventional heating control system is a conventional heating control system of the nuclear power plant safety injection system.
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power station heater, further setting two sets of heating control systems with different thresholds which are respectively independent in a column A and a column B, when the heating control system in the column A fails or the temperature drops sharply, the heating control system in the column B is started up due to different thresholds, if the heating system in the column A is normal, the temperature rises back, and the control threshold of the heating system in the column B may not be reached and the heating control system in the column B is not started; the test loop performs the described testing of effectiveness on a B-train heating system that may not be in operation for a long period of time.
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power station heater, further, the automatic control system of the heater is an automatic control system of a boric acid injection tank heater of a nuclear power station safety injection system, and the conventional heating control system is a conventional heating control system (column B) of the boric acid injection tank of the nuclear power station safety injection system.
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power plant heater, and further, the temperature high threshold A is listed as 65 ℃, and the temperature high threshold B is listed as 60 ℃.
Preferably, the invention provides a method for detecting the effectiveness of an automatic control system of a nuclear power plant heater, and further the temperature low threshold is 60 ℃ in column A and 55 ℃ in column B.
In short, the invention can detect whether the heating control system is in a normal and effective working state according to the operation requirement of the nuclear power station. Through periodic detection, whether the heating control system has obstacles or not can be detected in time, and the heating control system is prevented from being incapable of heating due to the obstacles.
Drawings
Fig. 1 is a schematic control flow diagram of a loop for an effectiveness detection test of a heating control system according to the present invention.
Fig. 2 is a control logic diagram of the heater of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
During normal operation of the plant, both the a and B trains control systems are in standby. And a thermometer is respectively arranged on the column A and the column B, and the temperature change of the boric acid injection box is monitored in real time. The temperature signal is collected in a digital display for threshold processing. For the column A digital display instrument, the high and low threshold values are respectively set to 65 ℃ and 60 ℃; for the column B digital display instrument, the high and low thresholds are set to 60 ℃ and 55 ℃ respectively. According to the setting of temperature thresholds of the A column and the B column, when the temperature reaches 60 ℃, the heater of the A column is started; the heater activation in column B is triggered only when the temperature reaches 55 c. When the power station is actually operated, the temperature of the boric acid injection tank generally rises and does not continuously drop to 55 ℃ after the heaters in the row A are started, so that the heating system in the row B is in a standby state for a long time because the heating system does not reach the set low threshold value. If the heating control system of the B row fails, the operator of the power station cannot know the failure. If the temperature of the boric acid injection box is too low (lower than 55 ℃), the heaters in the B column cannot be started due to faults, so that the boric acid injection box cannot be heated and the temperature is too low, and the crystallization of the boric acid is caused. Therefore, it is important to periodically test the effectiveness of the heating control system in column B.
The normal heating loop and the test detection loop are switched through the selector switch, and when the selector switch is switched to the control loop on one side of the sliding resistor, the heating control system enters a detection mode. At this time, the sliding resistance is adjusted according to the temperature set values (low threshold value 55 ℃ and high threshold value 60 ℃) of the heating system in the column B, the resistance value of the sliding resistance is collected by a digital display instrument and is subjected to signal preprocessing, and the resistance value is converted into a temperature signal and is compared with the temperature set value. When the temperature signal corresponding to the resistance value is lower than 55 ℃, the heater is triggered to start, and the boric acid injection box is heated. According to the control logic diagram of the heater, the starting command of the heater is kept through the RS trigger, and when the temperature reaches 55 ℃ and is lower than 60 ℃, the heater continues to heat; when the temperature signal corresponding to the resistance value is higher than 60 ℃, the heater is triggered to stop, and meanwhile, the starting signal of the RS trigger is reset, and the heating of the boric acid injection box is stopped.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations. The foregoing examples or embodiments are merely illustrative of the present invention, which may be embodied in other specific forms or in other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.
Claims (7)
1. The method for detecting the effectiveness of the automatic control system of the nuclear power station heater is characterized by comprising the following steps: a test loop is additionally arranged outside a normal working loop of a conventional heating control system, and under the condition that the heating system has test conditions, the switching between the normal working loop and the test loop is realized through the manual switching of a selector switch to detect the effectiveness,
the test loop simulates temperature signals through the sliding resistor, different temperature signals are configured by utilizing the adjustability of the sliding resistor, the temperature high and low thresholds are triggered,
when the temperature reaches a low threshold value, the control system triggers the heater to start;
when the temperature is higher than the low threshold and lower than the high threshold, the heater is continuously heated under the action of the control system;
when the temperature reaches a high threshold value, the control system triggers the heater to stop working;
if the control is not realized, the heating control system is proved to have obstacles and needs to be overhauled,
two sets of heating control systems of the A column and the B column which are respectively independent and have different threshold values are arranged, and when the heating control system of the A column fails or the temperature drops sharply, the heating control system of the B column is started due to the different threshold values; the test loop performs the described tests of effectiveness on the B-column heating system which may not be activated for a long period of time.
2. The method of claim 1, wherein: the control system realizes the function of keeping the control signal through the RS trigger.
3. The method of claim 1, wherein: the test loop is connected with a digital display instrument which displays a temperature signal value converted by the resistance value of the sliding resistor after signal processing.
4. The detection method according to any one of claims 1 to 3, characterized in that: the automatic heater control system is an automatic heater control system of the nuclear power station safety injection system, and the conventional heating control system is a conventional heating control system of the nuclear power station safety injection system.
5. The detection method according to any one of claims 1 to 3, characterized in that: the automatic heater control system is an automatic control system for a boric acid injection tank heater of the nuclear power station safety injection system, and the conventional heating control system is a conventional heating control system for the boric acid injection tank of the nuclear power station safety injection system.
6. The method of claim 1, wherein: the temperature high threshold A is 65 ℃ and the temperature high threshold B is 60 ℃.
7. The method of claim 1, wherein: the temperature low threshold value A is 60 ℃ and the temperature low threshold value B is 55 ℃.
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| CN110597445B (en) * | 2018-11-21 | 2021-06-25 | 深圳中广核工程设计有限公司 | Nuclear power station multi-sequence safety level display and control touch screen system and control method |
| CN111638701B (en) * | 2020-04-24 | 2021-08-31 | 岭东核电有限公司 | Nuclear power station safety injection verification method and device, computer equipment and storage medium |
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| JP5829392B2 (en) * | 2010-09-30 | 2015-12-09 | 三菱重工業株式会社 | Control device and nuclear power plant control system |
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