CN110415849A - A kind of reply heat extraction increases the protection system of superposition SWCCF accident - Google Patents
A kind of reply heat extraction increases the protection system of superposition SWCCF accident Download PDFInfo
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- CN110415849A CN110415849A CN201910717175.7A CN201910717175A CN110415849A CN 110415849 A CN110415849 A CN 110415849A CN 201910717175 A CN201910717175 A CN 201910717175A CN 110415849 A CN110415849 A CN 110415849A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
- G21D3/06—Safety arrangements responsive to faults within the 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
- 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
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- Business, Economics & Management (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses the protection systems that a kind of reply heat extraction increases superposition SWCCF accident; the protection system is used to occur under the operating condition of SWCCF in the safety level platform of nuclear power plant; and reactor main protection system loses defencive function; nuclear power plant is protected; the protection system includes: measuring unit, and the measuring unit is used to measure the associated safety data of nuclear power plant；Processing transmission channel, the processing transmission channel is used to handle the associated safety data that measurement obtains, and data pass to control unit by treated；Control unit, described control unit are used to transmission channel treated data carrying out logic judgment, carry out protection operation to nuclear power plant based on the result of judgement；This system improves the safety of nuclear power plant.
Description
Technical field
The present invention relates to PWR nuclear power plant field of safety protection, and in particular, to a kind of reply heat extraction increase superposition
The protection system of SWCCF accident.
Background technique
The nuclear power plant that Digitizing And Control Unit (DCS) is used for reactor protection system, occurs water supply under normal circumstances
The system failure causes the primary Ioops heat extractions such as feedwater flow increase, the release of main steam system accident or main steam system pipeline breaking to increase
When adding accident, the reactor protection system (RPS) of safety level platform will realize triggering emergency shut-down system and drive ad hoc safety
The function of facility.It is total to since the failure of certain unpredictable software errors or system level causes DCS system that software occurs
When mould failure (SWCCF), RPS system function is lost, and the security function of automatic trigger all fails substantially, specifically includes that and promptly stop
Heap protection, safety injection function, container spray function etc., it is possible to jeopardize the safety of reactor core and containment.
Summary of the invention
Reactor protection system generation software common mode failure when primary Ioops heat extraction increases accident occurs in order to cope with nuclear power plant
The case where normal defencive function cannot be provided, devises independently of the diversified protection system except safety level platform, to nuclear power
Factory provides diversification protection, so that it is guaranteed that npp safety.
The present invention is a kind of protection system of PWR nuclear power plant (station), and the present invention proposes to be arranged independently of safety level platform
Except diversified protection system alleviate primary Ioops heat extraction increase superposition safety level platform SWCCF accident consequence, by reactor
And nuclear power plant maintains certain safe condition.
For achieving the above object, this application provides the protection systems that a kind of reply heat extraction increases superposition SWCCF accident
System, the protection system are used in the case where the operating condition of SWCCF occurs for the safety level platform of nuclear power plant, and reactor main protection system is lost
When defencive function, nuclear power plant is protected, the protection system includes:
Measuring unit, the measuring unit are used to measure the associated safety data of nuclear power plant；
Transmission channel is handled, the processing transmission channel is used to handle the associated safety data that measurement obtains, and
By treated, data pass to control unit；
Control unit, described control unit is used to transmission channel treated data carrying out logic judgment, based on judgement
Result protection operation is carried out to nuclear power plant.
Further, the safety level platform of the protection system and nuclear power plant is independent mutually.
Further, processing transmission channel is used to handle the associated safety data that measurement obtains, and specifically includes: connecing
The neutron fluence rate signal for receiving Nuclear Instrument, is acquired received signal, operation and definite value are compared, and generates and decides by vote for logic
Signal, meet as defined in logical combination require when issue shutdown signal；Voltage-stablizer pressure signal is received, to received signal
Be acquired, operation and definite value are compared, generate for logic voting signal, meet as defined in logical combination require when issue
Shutdown or starting peace note signal；Steam generator secondary side steam pressure signal and steam flow signal are received, to received letter
Number be acquired, operation and definite value are compared, and the signal for logic voting is generated, the logical combination as defined in meeting is sent out when requiring
Main steam pipe isolation signals out.
Further, measuring unit is specifically used for steaming reactor nucleus power, voltage-stablizer pressure, steam generator secondary side
Steam pressure, steam generator secondary side steam flow carry out lasting measurement.
Further, control unit is specifically used for triggering emergency shut-down when neutron fluence rate is higher than threshold value；Work as voltage-stablizer
Pressure triggers emergency shut-down when being lower than threshold value；The triggering peace note starting when voltage-stablizer pressure is lower than threshold value；When steam flow is higher than
Threshold value and when compensation steam pressure is lower than threshold value triggers the isolation of automatic main steam pipe.
Further, carry out protection operation to nuclear power plant, specifically include: emergency shut-down operation pacifies note start-up operation, is automatic
Main steam pipe operation is isolated.
Further, the measuring unit specifically includes: neutron detector is arranged in dedicated outside reactor pressure vessel
In instrument well, the neutron fluence rate from reactor core is measured, and the signal measured is sent by dedicated signal-transmitting cable to letter
Number processing transmission channel；Voltage-stablizer pressure measurement transmitter, pressure tappings are located at voltage-stablizer top air space, with gauge pipe by pressure stabilizing
Device pressure introduces the pressure transmitter measurement voltage-stablizer pressure being installed in containment；Steam generator secondary side steam pressure is surveyed
Transmitter, pressure tappings are located on the main steam pipe of main steam safety valve upstream, introduce steam pressure with gauge pipe and install
In the pressure transmitter measurement steam pressure outside containment；Steam generator secondary side flow measurement of steam differential pressure transmitter is used
Steam generator outlet flow restrictor measures its front and back pressure difference as throttling element to obtain steam flow, and pressure tappings are located at
On steam generator air space and steam generator outlet steam pipe line, with gauge pipe by steam generator outlet flow restriction
Pressure before and after device introduces the differential pressure transmitter being installed in containment.
One or more technical solution provided by the present application, has at least the following technical effects or advantages:
The present invention can increase superposition peace in primary Ioops heat extraction by diversified protection system except setting safety level platform
Emergency shut-down is triggered under full grade platform SWCCF accident, starts the safety for pacifying note and isolation main steam pipe to guarantee nuclear power plant,
Improve the safety of nuclear power plant.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 is the composition schematic diagram that the protection system that heat extraction increases superposition SWCCF accident is coped in the application.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
Basic principle of the invention are as follows:
After primary Ioops heat extraction increase superposition safety level platform SWCCF accident occurs, the protection thrashing of safety level platform,
It loses functions, the nuclear power plants such as triggering reactor emergency shut-down, the starting of peace note, container spray and loses safeguard protection.
Diversified protection system is set except safety level platform, which is arranged the measurement independently of safety level platform
Unit, processing transmission channel and control unit, are not influenced by safety level platform SWCCF accident, can be lost in safety level platform
Nuclear power plant is protected when effect.By analyzing under the premise of meeting npp safety, it is arranged in diversified protection system
Least defencive function minimizes diversified protection system；It rationally designs diversification protection signal setting valve and RPS signal is whole
Deviation between definite value avoids conflicting with the generation of main protection system.Increase accident for primary Ioops heat extraction, is provided with following necessity
Protection signal: 1) neutron fluence rate height and voltage-stablizer pressure low signal trigger emergency shut-down；2) the low low signal of voltage-stablizer pressure
Triggering peace note starting；3) steam flow high RST and compensation steam pressure low signal meet automatism isolation main steam pipe.It can
Guarantee that triggering emergency shut-down reduces reactor capability when primary Ioops heat extraction occurs and increases superposition safety level platform SWCCF accident,
Starting safety injection system introduces negative reactivity to reactor core and maintains the loading amount of primary Ioops coolant, and isolation main steam pipe terminates intact
Steam generator is discharged to the high-temperature steam of containment, guarantees the safety of reactor core and the integrality of containment.
(2) structure of system:
Referring to FIG. 1, Major Systems/equipment that diversified protection setting is related to includes measuring unit, handles to transmit and lead to
Road and control unit.
Measuring unit is to reactor nucleus power, voltage-stablizer pressure, steam generator secondary side steam pressure, steam generator
Secondary side steam flow carries out lasting measurement.
Processing transmission channel handles measurement parameter, and passes to control unit.
Control unit is " neutron fluence rate height triggers emergency shut-down ", " the low triggering emergency shut-down of voltage-stablizer pressure ", " pressure stabilizing
Device pressure low triggering peace note starting " and " steam flow height with compensate steam pressure is low to meet automatism isolation main steam pipe ".
Diversified measuring unit, processing transmission channel and control unit can increase superposition peace primary Ioops heat extraction occurs
Emergency shut-down, starting peace note or isolation main steam pipe are triggered after full grade platform SWCCF accident, thus guarantee reactor core safety and
The integrality of containment.
This system is designed as " diversification protection, automatic trigger, auto-action ", and related system and equipment is not by main protection system
The influence of system software common mode failure, triggers automatic protection signal after reactor parameter reaches setting valve, executes corresponding automatic
Movement.It is specific as follows:
After the accident, primary Ioops coolant temperature reduces, and temperature, which reduces introducing positive reactivity, causes reactor capability to increase
Add, primary Ioops pressure reduction；Under the operating condition that SWCCF occurs for safety level platform, reactor main protection system loses defencive function；
The diversification protection system trigger when reactor capability increases to shutdown setting valve or voltage-stablizer pressure reduction to shutdown setting valve
Emergency shut-down, control rod, which falls, reduces reactor capability.When triggering definite value is infused in voltage-stablizer pressure reduction to peace, diversification protection
System starts safety injection system and injects high concentration boron water to primary Ioops, introduces negative reactivity to reactor core and primary Ioops coolant is maintained to fill
Amount.
Accident, the high setting valve of steam flow are increased for the primary Ioops heat extraction that steam generator secondary side in containment ruptures
Diversification protection system trigger steam flow height symbol low with compensation steam pressure when setting valve low with compensation steam pressure all reaches
Signal automatism isolation main steam pipe is closed, terminating intact steam generator high-temperature steam and being discharged into containment leads to its pressure liter
It is high.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. the protection system that a kind of reply heat extraction increases superposition SWCCF accident, which is characterized in that the protection system is used in core
Power plant occurs primary Ioops heat extraction and increases accident, and under the operating condition of the safety level platform generation SWCCF of nuclear power plant, and the main guarantor of reactor
Protecting system loses defencive function, protects to nuclear power plant, the protection system includes:
Measuring unit, the measuring unit are used to measure the associated safety data of nuclear power plant；
Transmission channel is handled, the processing transmission channel is used to handle the associated safety data that measurement obtains, and will place
Data after reason pass to control unit；
Control unit, described control unit are used to transmission channel treated data carrying out logic judgment, the knot based on judgement
Fruit carries out protection operation to nuclear power plant.
2. the protection system that reply heat extraction according to claim 1 increases superposition SWCCF accident, which is characterized in that described
The safety level platform of protection system and nuclear power plant is independent mutually.
3. the protection system that reply heat extraction according to claim 1 increases superposition SWCCF accident, which is characterized in that processing
Transmission channel is used to handle the associated safety data that measurement obtains, and specifically includes: receiving the neutron fluence rate of Nuclear Instrument
Signal is acquired received signal, operation and definite value are compared, signal of the generation for logic voting, as defined in satisfaction
Logical combination issues shutdown signal when requiring；Voltage-stablizer pressure signal is received, received signal is acquired, operation and definite value
Compare, generate the signal for logic voting, shutdown or starting peace note signal are issued when the logical combination as defined in meeting requires；
Steam generator secondary side steam pressure signal and steam flow signal are received, received signal is acquired, operation and fixed
Value compares, and generates the signal for logic voting, and main steam pipe isolation letter is issued when the logical combination as defined in meeting requires
Number.
4. the protection system that reply heat extraction according to claim 1 increases superposition SWCCF accident, which is characterized in that measurement
Unit is specifically used for secondary to reactor nucleus power, voltage-stablizer pressure, steam generator secondary side steam pressure, steam generator
Side steam flow carries out lasting measurement.
5. the protection system that reply heat extraction according to claim 4 increases superposition SWCCF accident, which is characterized in that control
Unit is specifically used for triggering emergency shut-down when neutron fluence rate is higher than threshold value；When voltage-stablizer pressure is lower than threshold value, triggering is urgent
Shutdown；The triggering peace note starting when voltage-stablizer pressure is lower than threshold value；It is lower than when steam flow is higher than threshold value and compensates steam pressure
Automatic main steam pipe isolation is triggered when threshold value.
6. reply heat extraction according to claim 1 increases the protection system of superposition SWCCF accident, which is characterized in that core
Power plant carries out protection operation, specifically includes: emergency shut-down operation, the start-up operation of peace note, the operation of automatism isolation main steam pipe.
7. the protection system that reply heat extraction according to claim 1 increases superposition SWCCF accident, which is characterized in that described
Measuring unit specifically includes: neutron detector is arranged in the meter specially well outside reactor pressure vessel, and measurement comes from reactor core
Neutron fluence rate, and the signal measured is sent by dedicated signal-transmitting cable to signal processing transmission channel；Voltage-stablizer
Pressure measurement transmitter, pressure tappings are located at voltage-stablizer top air space, and the introducing of voltage-stablizer pressure is installed on safety with gauge pipe
Pressure transmitter measurement voltage-stablizer pressure in shell；Steam generator secondary side steam pressure measuring transducer, pressure tappings are located at
On the main steam pipe of main steam safety valve upstream, steam pressure is introduced to the pressure inverting being installed on outside containment with gauge pipe
Device measures steam pressure；Steam generator secondary side flow measurement of steam differential pressure transmitter, with steam generator outlet Flow Limit
Device processed measures its front and back pressure difference as throttling element to obtain steam flow, pressure tappings be located at steam generator air space and
On steam generator outlet steam pipe line, the pressure before and after steam generator outlet flow restrictor is introduced into installation with gauge pipe
In the differential pressure transmitter in containment.
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| CN201910717175.7A CN110415849B (en) | 2019-08-05 | 2019-08-05 | Protection system for coping with heat extraction increase superposition SWCCF accident |
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| CN201910717175.7A CN110415849B (en) | 2019-08-05 | 2019-08-05 | Protection system for coping with heat extraction increase superposition SWCCF accident |
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| CN113593739A (en) * | 2021-07-22 | 2021-11-02 | 中国核动力研究设计院 | Control method for dealing with water supply flow loss accident of nuclear power plant |
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| CN113593739A (en) * | 2021-07-22 | 2021-11-02 | 中国核动力研究设计院 | Control method for dealing with water supply flow loss accident of nuclear power plant |
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| CN110415849B (en) | 2020-11-24 |
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