CN102324258B - Method and system for preventing error drive of ATWT (Anticipated Transients without Trip) equipment cabinet - Google Patents
Method and system for preventing error drive of ATWT (Anticipated Transients without Trip) equipment cabinet Download PDFInfo
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- CN102324258B CN102324258B CN201110164273.6A CN201110164273A CN102324258B CN 102324258 B CN102324258 B CN 102324258B CN 201110164273 A CN201110164273 A CN 201110164273A CN 102324258 B CN102324258 B CN 102324258B
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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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Abstract
The invention discloses a method and system for preventing error drive of an ATWT (Anticipated Transients without Trip) equipment cabinet, wherein the method comprises the following steps of: collecting a main feedwater flow signal and a nuclear instrument signal; collecting a power loss signal of a reactor protection equipment cabinet; outputting a first signal after the power loss signal and the main feedwater flow signal are subjected to a first logic AND treatment; and outputting a second signal after the first signal and the nuclear instrument signal are subjected to a second logic AND treatment, wherein the second signal is used for determining whether ATMT happens or not. Through the collection of the power loss signal of the reactor protection equipment cabinet and the corresponding logic treatment of the signals, the error protection of the ATWT is effectively inhibited.
Description
Technical field
The present invention relates to nuclear power technology field, relate in particular to a kind of method and system that prevents that nuclear power station ATWT rack mistake from driving.
Background technology
Reactor protection system is mainly emergency shut-down to the salvo of accident conditions, starts ATWT (tripping of Anticipated Transients without Trip trip protection system) rack in the time that emergency shut-down protection is broken down.As nuclear power station parameter reaches emergency shut-down protection threshold value but does not produce emergency shut-down guard signal, although or produced scram signal scram breaker and do not disconnected, and there is ATWT in directly emergency shut-down.
ATWT rack has adopted protection logic as shown in Figure 1; when in the middle of nuclear power station, range core power is greater than 30%Pn; if main feedwater flow is lower than 6%NF; start ATWT protection, take the actions such as shutdown, shutdown, startup auxiliary feedwater and the 3rd group of bleed valve of locking GCT (Steam Turbine Bypass System).
ATWT protects as one of diversified important means of reactor protection; in order to prevent digitizing common mode failure; adopt mimic channel to realize ATWT function, this function realizes in DAC (variation drives rack), generally also DAC variation rack can be called to ATWT rack.
Prior art scheme is as Fig. 2; main feedwater flow signal is delivered to ATWT rack after being gathered, distribute, isolated by RPC (reactor protection rack); signal type is 0-10V, and the signal of RPN (core instrument) directly gathers from RPN rack (comprising test and fault-signal).Main feedwater flow signal does three and gets two logics, does "AND" logic with RPN signal, finally produces ATWT signal, triggers corresponding protection action.That shown in Fig. 2, anticipates in fact all adopts the hard logic module that analog component is barricaded as to realize with door or door.
Because main feedwater flow sensor is powered by RPC rack; in the time there is RPC rack dead electricity; the flow signal that is sent to ATWT rack becomes 0V; and at power plant's normal operation period; core power must be greater than 30%FP, and this will cause driving ATWT protection by mistake, produces the serious consequences such as spurious shutdown, mistakenly stop machine; reduce the available rate of power plant, caused tremendous economic loss to power plant simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is, for prior art, the defect that ATWT protection mistake drives easily occurs, and a kind of method and system that prevents that nuclear power station trip protection system tripping ATWT rack mistake from driving is provided.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of method that prevents that nuclear power station ATWT rack mistake from driving is provided, comprises step: gather main feedwater flow signal and core instrument signal, also comprise step:
Gather the power supply dead electricity signal of reactor protection rack;
By described power supply dead electricity signal and described main feedwater flow signal through with logical process after export first signal;
By described first signal and described core instrument signal through with logical process after export secondary signal, and characterize according to described secondary signal whether ATWT occurs, and trigger ATWT protection.
In the method that prevents the driving of nuclear power station ATWT rack mistake of the present invention, described power supply dead electricity signal is 0 o'clock, represents that the power supply of reactor protection rack is normal; Described main feedwater flow signal is 1 o'clock, represents that the middle range core of nuclear power station power is greater than 30%Pn; Described main feedwater flow signal is 1 o'clock, represents that main feedwater flow is lower than 6%NF; Be 1 o'clock at described power supply dead electricity signal, and described main feedwater flow signal and described core instrument signal be at 1 o'clock, now described first signal and described secondary signal are 1, and described logic judgement produces ATWT signal, and ATWT protection occurs ATWT rack simultaneously.
Of the present inventionly prevent that power supply dead electricity signal described in method that nuclear power station ATWT rack mistake drives from being the dead electricity signal of primary power or standby power supply in described reactor protection rack.
Main feedwater flow signal described in the method that nuclear power station ATWT rack of the present invention drives is that three steam generator flow low signals are got the signal of two logic outputs by three.
Described in the method that nuclear power station ATWT rack of the present invention drives, gathering core instrument signal is specially: range, test pattern and fault-signal in core instrument system one passage are exported to a channel signal by OR circuit; Meanwhile, range, test pattern and fault-signal in core instrument system two passages are also exported to two channel signals by OR circuit; A described channel signal and two channel signals are exported to described core instrument signal by AND circuit again.
Another technical scheme that technical solution problem of the present invention adopts is:
A kind of method that prevents that nuclear power station ATWT rack mistake from driving is provided, comprise reactor protection rack, main feedwater flow signal acquisition module, core instrument signal acquisition module and ATWT rack, described reactor protection rack comprises primary power and standby power supply, this system also comprises: power supply dead electricity signal acquisition module, for gathering the power supply dead electricity signal of described reactor protection rack; Described ATWT rack comprises the first logical and circuit, the second logical and circuit and ATWT driver module;
Described the first logical and circuit is exported first signal for the main feedwater flow signal that described power supply dead electricity signal and described main feedwater flow signal acquisition module are gathered after AND circuit is processed;
Described the second logical and circuit, after AND circuit processing, export secondary signal for the core instrument signal that described first signal and described core instrument signal acquisition module are gathered, described secondary signal is used for controlling described ATWT driver module whether ATWT occurs.
In the system that nuclear power station ATWT rack of the present invention drives, described power supply dead electricity signal acquisition module comprises the first relay being connected with described primary power and the second relay being connected with described standby power supply, two contact parallel connections of described the first relay and described the second relay;
Described ATWT rack comprises the 3rd relay, and the coiler part of described the 3rd relay is connected with parallel connection place of described the first relay and described the second relay, and the contact of described the 3rd relay is connected with described the first logical and circuit.
In the method that prevents the driving of nuclear power station ATWT rack mistake of the present invention; main feedwater flow signal acquisition module comprises three flow sensors; for detection of the flow of three steam generators in reactor protection cabinet four-way rack; described three flow sensors are by three steam generator flow low signals that detect between two by obtaining three signals after AND circuit, and these three signals are again by obtaining described main feedwater flow signal after OR circuit.
In the method that prevents the driving of nuclear power station ATWT rack mistake of the present invention, core instrument signal acquisition module comprises a channel signal processing unit, two passage signal processing units and the 3rd logical and circuit, wherein:
A described channel signal processing unit, for exporting a channel signal by range signal, test mode signal and the fault-signal of core instrument system one passage after by OR circuit;
Described two passage signal processing units, for exporting two channel signals by range signal, test mode signal and the fault-signal of core instrument system two passages after by OR circuit;
Described the 3rd logical and circuit, for exporting described core instrument signal by a described channel signal and described two channel signals after by AND circuit.
The beneficial effect that the present invention produces is: the power supply dead electricity signal that gathers reactor protection rack by power supply dead electricity signal acquisition module; gathered main feedwater flow signal, core instrument signal and power supply dead electricity signal are passed through to the first logical and circuit and the second logical and processing of circuit; utilize the signal controlling of the second logical and circuit output whether ATWT occurs, thereby the misoperation of ATWT is effectively suppressed.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is ATWT protection logic realization schematic diagram;
Fig. 2 is the logic realization schematic diagram of ATWT in prior art;
Fig. 3 is the system architecture schematic diagram that preferred embodiment nuclear power station ATWT rack of the present invention drives;
Fig. 4 is the system power supply dead electricity signal acquisition module of preferred embodiment nuclear power station ATWT rack driving of the present invention and the part-structure schematic diagram of ATWT driver module;
Fig. 5 is that the system logic that preferred embodiment nuclear power station ATWT rack of the present invention drives realizes schematic diagram;
Fig. 6 is the method flow diagram that nuclear power station ATWT rack of the present invention drives.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 3, the system that preferred embodiment nuclear power station ATWT rack of the present invention drives comprises main feedwater flow signal acquisition module 10, power supply dead electricity signal acquisition module 20, core instrument signal acquisition module 30 and ATWT rack 40, power supply dead electricity signal acquisition module 20 is for gathering the power supply dead electricity signal of reactor protection rack (being RPC rack), and power supply dead electricity signal can be the dead electricity signal of primary power or standby power supply in RPC rack; Power supply dead electricity signal is 1 o'clock, represents that the power supply of RPC rack is normal, and power supply dead electricity signal is to represent that the power supply of RPC rack is undesired at 0 o'clock; ATWT rack 40 comprises the first logical and circuit 41, the second logical circuit 42 and ATWT driver module 43; The first logical and circuit 41, after AND circuit processing, export first signal for the main feedwater flow signal that power supply dead electricity signal and main feedwater flow signal acquisition module 10 are gathered, in preferred embodiment of the present invention, main feedwater flow signal is 1 o'clock, represents that main feedwater flow is lower than 6%NF; The second logical and circuit 42, after AND circuit processing, export secondary signal for the core instrument signal that first signal and core instrument signal acquisition module 30 are gathered, preferred embodiment center instrument signal of the present invention is 1 o'clock, in the middle of representing nuclear power station, range core power is greater than 30%Pn, and whether secondary signal control ATWT driver module 43 ATWT occurs.Be 1 o'clock at power supply dead electricity signal, and main feedwater flow signal and core instrument signal be at 1 o'clock, now first signal and secondary signal are also 1, produce ATWT signal, and ATWT protection occurs ATWT rack simultaneously.
Further, as shown in Figure 4, power supply dead electricity signal acquisition module 20 is arranged in RPC (reactor protection cabinet is generally reactor protection cabinet four-way rack), and RPC is powered by primary power 21 or standby power supply 22.Power supply dead electricity signal acquisition module 20 comprises the first relay 23 being connected with primary power 21 and the second relay 23 being connected with standby power supply 22, primary power 21 and standby power supply 22 are respectively the coil power supply in the first relay 23 and the second relay 24, two contact parallel connections of the first relay 23 and the second relay 24, output dry contact signal.
ATWT rack 40 comprises that the coiler part of the 3rd relay 44, the three relays 44 is connected with parallel connection place of the first relay 23 and the second relay 24, and the contact of the 3rd relay 44 is connected with the first logical circuit 41.The i.e. current switching of contact signal control the 3rd relay 44 coils at the first relay 23 and the second relay 24 places in parallel, the 3rd relay 44 coils are by the DC power supply of 48V, and the 3rd relay 44 coil contact switchs are by the DC-voltage supply of 24V.The contact out-put supply dead electricity signal of the 3rd relay 44, power supply dead electricity signal is controlled ATWT driver module 43 whether ATWT is occurred after the logical process of the first logical and circuit 42.
The concrete internal logic that preferred embodiment of the present invention prevents the system that nuclear power station ATWT rack mistake drives as shown in Figure 5, the signal that main feedwater flow control signal acquisition module 10 gathers is mainly from RPC (reactor protection cabinet four-way rack), feedwater flow control system in RPC comprises feedwater flow sensor 049, 050 and 051, carry out the flow of three steam generators in detection reaction heap protection cabinet four-way rack by feedwater flow sensor, three steam generator flow low signals are between two by obtaining three signals after AND circuit, these three signals obtain final main feedwater flow signal by OR circuit again, main feedwater flow signal is 1 o'clock, represent that main feedwater flow is lower than 6%NF.The power supply dead electricity signal gathering from RPC and final main feedwater flow signal obtain RPC output signal, i.e. first signal through an AND circuit again.
Core instrument signal acquisition module 30 comprises a channel signal processing unit, two passage signal processing units and the 3rd logical and circuit, wherein, one channel signal processing unit, for exporting a channel signal by the range of core instrument system one passage, test pattern and fault-signal after by OR circuit; Two passage signal processing units, for exporting two channel signals by the range of core instrument system two passages, test pattern and fault-signal after by OR circuit; The 3rd logical and circuit, for a channel signal and two channel signals are exported to core instrument signal (RPN signal) after by AND circuit, RPN signal is 1 o'clock, represent nuclear power station in the middle of range core power be greater than 30%FP.RPN signal and RPC output signal (being first signal) are again through an AND circuit, and utilizing the signal of this AND circuit output is secondary signal, controls ATWT driver module.
All logical devices in logical diagram as shown in Figure 5 all adopt the hard logic module that analog component is barricaded as to realize.ATWT is energized action, and in the time that RPC power supply is normal, power supply dead electricity signal is high level 1; In the time of RPC rack dead electricity, power supply dead electricity signal is low level 0, and RPC output signal must be low level 0, thereby the misoperation of ATWT is effectively suppressed.
The present invention gathers the power supply dead electricity signal of RPC rack by power supply dead electricity signal acquisition module 20, gathered main feedwater flow signal, core instrument signal and power supply dead electricity signal are processed by the first logical circuit 41 and the second logical circuit 42, the signal driver ATWT driver module 43 that utilizes the second logical circuit 42 to export, thus the misoperation of ATWT is effectively suppressed.
The present invention also provides the method that prevents that nuclear power station ATWT rack mistake from driving, and as shown in Figure 6, comprises step:
S1, gather main feedwater flow signal and core instrument signal.Main feedwater flow signal is that three steam generator flow low signals are got the signal of two logic outputs by three; the feedwater flow control system being specially in RPC IVP comprises feedwater flow sensor 049,050 and 051; carry out the flow of three steam generators in detection reaction heap protection cabinet RPC by feedwater flow sensor; three steam generator flow low signal two two-phases with after obtain three signals, these three signals again by or door obtain final main feedwater flow signal.From RPN IP and RPN IIP, gather core instrument signal, by range signal, test mode signal and fault-signal in RPN IP (core instrument system one passage) by one or door output RPN IP signal, similarly, by range signal, test mode signal and fault-signal in RPN IIP (core instrument system two passages) also by one or door output RPN IIP signal, finally RPN IP signal and RPN IIP signal are exported to RPN signal, i.e. core instrument signal by one with door again.
S2, from RPC, gather the power supply dead electricity signal of RPC rack, power supply dead electricity signal is the dead electricity signal of primary power or standby power supply in RPC rack, when power supply dead electricity signal is high level 1, shows that the power supply of RPC rack is normal, when power supply dead electricity signal is low level 0, show that the power supply of RPC rack is undesired.ATWT is energized action, and in the time that RPC rack power supply is normal, power supply dead electricity signal is high level 1; In the time of RPC rack dead electricity, power supply dead electricity signal is low level 0, and RPC rack output signal must be low level 0, thereby the misoperation of ATWT is effectively suppressed.
S3, power supply dead electricity signal and main feedwater flow signal after processing, the first logical and are exported to first signal;
S4, in ATWT rack, first signal and core instrument signal are exported to secondary signal after the second logical and is processed, secondary signal is used for controlling ATWT rack whether ATWT occurs.In the time that power supply is normal; be that power supply dead electricity signal is 1; and main feedwater flow signal and core instrument signal are at 1 o'clock; now first signal and secondary signal are 1; there is ATWT; there is ATWT protection action, comprise shutdown, shutdown, startup auxiliary feedwater and the 3rd group of GCT bleed valve of locking etc.
Further, preferred embodiment of the present invention prevents that, in the method for nuclear power station ATWT rack mistake driving, the concrete steps that gather power supply dead electricity signal are:
The first relay in RPC rack is connected with primary power, the second relay in RPC rack is connected with standby power supply, two contact parallel connections of the first relay and the second relay, primary power and standby power supply are respectively the coil power supply in the first relay and the second relay, two contact parallel connections of the first relay and the second relay, output dry contact signal.The contact signal at place in parallel is the current switching that dry contact signal is used for controlling the 3rd relay coil in diversified rack, and the signal of the output of the 3rd relay contact is power supply dead electricity signal.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (7)
1. prevent the method that nuclear power station trip protection system ATWT rack mistake drives, comprise step: gather main feedwater flow signal and core instrument signal, it is characterized in that, also comprise step:
Gather the power supply dead electricity signal of reactor protection rack;
By described power supply dead electricity signal and described main feedwater flow signal through with logical process after export first signal;
By described first signal and described core instrument signal through with logical process after export secondary signal, and be confirmed whether to occur ATWT according to described secondary signal;
Described main feedwater flow signal is that three steam generator flow low signals are got the signal of two logic outputs by three;
Described steam generator flow low signal is detected and is obtained by feedwater flow sensor;
Described feedwater flow sensor is powered by described reactor protection rack;
Described power supply dead electricity signal is the dead electricity signal of primary power or standby power supply in described reactor protection rack.
2. the method that prevents that nuclear power station trip protection system ATWT rack mistake from driving according to claim 1, is characterized in that, described power supply dead electricity signal is 1 o'clock, represents that the power supply of RPC rack is normal; Described core instrument signal is 1 o'clock, represents that the middle range core of nuclear power station power is greater than 30%Pn; Described main feedwater flow signal is 1 o'clock, represents that main feedwater flow is lower than 6%NF; Be 1 o'clock at described power supply dead electricity signal, and described main feedwater flow signal and described core instrument signal be at 1 o'clock, now described first signal and described secondary signal are 1, produce ATWT signal, and ATWT protection occurs ATWT rack.
3. the method that prevents the driving of nuclear power station trip protection system ATWT rack mistake of stating according to claim 2, it is characterized in that, described collection core instrument signal is specially: range, test pattern and fault-signal in core instrument system one passage are exported to a channel signal by OR circuit; Meanwhile, range, test pattern and fault-signal in core instrument system two passages are also exported to two channel signals by OR circuit; A described channel signal and two channel signals are exported to described core instrument signal by AND circuit again.
4. a system that prevents that nuclear power station trip protection system ATWT rack mistake from driving, comprise reactor protection rack, main feedwater flow signal acquisition module (10), core instrument signal acquisition module (30) and ATWT rack (40), described reactor protection rack comprises primary power (21) and standby power supply (22), it is characterized in that, this system also comprises: power supply dead electricity signal acquisition module (20), for gathering the power supply dead electricity signal of described reactor protection rack; Described ATWT rack (40) comprises the first logical and circuit (41), the second logical and circuit (42) and ATWT driver module (43);
Described the first logical and circuit (41) is exported first signal for the main feedwater flow signal that described power supply dead electricity signal and described main feedwater flow signal acquisition module (10) are gathered after AND circuit is processed;
Described the second logical and circuit (42), after AND circuit processing, export secondary signal for the core instrument signal that described first signal and described core instrument signal acquisition module (30) are gathered, described secondary signal is used for controlling described ATWT driver module whether ATWT(43 occurs);
Main feedwater flow signal acquisition module (10) comprises three flow sensors (049,050 and 051), for detection of the flow of three steam generators in reactor protection cabinet four-way rack, described three flow sensors (049,050 and 051) are by three steam generator flow low signals that detect between two by obtaining three signals after AND circuit, and these three signals are again by obtaining described main feedwater flow signal after OR circuit;
Described flow sensor is powered by described reactor protection rack;
Described power supply dead electricity signal is the dead electricity signal of primary power or standby power supply in described reactor protection rack.
5. the system that prevents that nuclear power station trip protection system ATWT rack mistake from driving according to claim 4; it is characterized in that; it is 1 o'clock at described power supply dead electricity signal; and described main feedwater flow signal and described core instrument signal are at 1 o'clock; described first signal and described secondary signal are 1; producing ATWT signal,, there is ATWT in the emergency shut-down of described ATWT rack.
6. the system that prevents that nuclear power station trip protection system ATWT rack mistake from driving according to claim 5, it is characterized in that, described power supply dead electricity signal acquisition module (20) comprises the first relay (23) being connected with described primary power (21) and the second relay (24) being connected with described standby power supply (22), two contact parallel connections of described the first relay (23) and described the second relay (24);
Described ATWT rack (40) comprises the 3rd relay (44), the coiler part of described the 3rd relay (44) is connected with parallel connection place of described the first relay (23) and described the second relay (24), and the contact of described the 3rd relay (44) is connected with described the first logical and circuit (41).
7. the system that prevents that nuclear power station trip protection system ATWT rack mistake from driving according to claim 6, is characterized in that, core instrument signal acquisition module comprises a channel signal processing unit, two passage signal processing units and the 3rd logical and circuit,
Wherein:
A described channel signal processing unit, for exporting a channel signal by range signal, test mode signal and the fault-signal of core instrument system one passage after by OR circuit;
Described two passage signal processing units, for exporting two channel signals by range signal, test mode signal and the fault-signal of core instrument system two passages after by OR circuit;
Described the 3rd logical and circuit, for exporting described core instrument signal by a described channel signal and described two channel signals after by AND circuit.
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| CN104332188A (en) * | 2013-07-22 | 2015-02-04 | 中国核动力研究设计院 | Method for alleviating primary loop overpressure during normal feedwater fail-ATWS (Anticipated Transients Without Scram) accident |
| CN103400623A (en) * | 2013-07-30 | 2013-11-20 | 中广核工程有限公司 | Protection method and system for digitalized instrument control diversity of nuclear power station |
| CN104348132B (en) * | 2013-08-09 | 2017-07-18 | 中核核电运行管理有限公司 | Reactor protection system external power source interlocking controller |
| CN104348133B (en) * | 2013-08-09 | 2017-07-18 | 中核核电运行管理有限公司 | Reactor protection system internal electric source interlocking controller |
| CN103499958A (en) * | 2013-09-30 | 2014-01-08 | 中国神华能源股份有限公司 | Method and device for controlling MFT (Main Fuel Trip) |
| CN103700414B (en) * | 2013-12-10 | 2017-02-22 | 中广核工程有限公司 | Diversity driving system and method for nuclear power plant |
| CN103985421B (en) * | 2014-05-06 | 2016-09-28 | 中广核研究院有限公司 | The method that reactor fails to improve nuclear power generating sets safety during emergency shut-down |
| CN108022662B (en) * | 2016-11-03 | 2021-06-29 | 斗山重工业株式会社 | Digital protection system of nuclear power station |
| CN108242271A (en) * | 2016-12-27 | 2018-07-03 | 中广核研究院有限公司 | A kind of reactor virtual protection control device and its corresponding protection system |
| CN111292862B (en) * | 2020-03-27 | 2021-12-17 | 江苏核电有限公司 | Emergency reactor shutdown method based on signal state of safety important instrument of nuclear power plant |
| CN111681792B (en) * | 2020-05-14 | 2022-10-14 | 岭东核电有限公司 | ATWT control device and nuclear power equipment |
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Address after: 518023 No. 69 Shennan Middle Road, Shenzhen, Guangdong, Futian District Co-patentee after: CHINA GENERAL NUCLEAR POWER Corp. Patentee after: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Address before: 518023 No. 69 Shennan Middle Road, Shenzhen, Guangdong, Futian District Co-patentee before: CHINA GUANGDONG NUCLEAR POWER GROUP Co.,Ltd. Patentee before: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. |