CN113704962B - Design method for optimizing loading load of emergency diesel generator set of pressurized water reactor nuclear power plant - Google Patents
Design method for optimizing loading load of emergency diesel generator set of pressurized water reactor nuclear power plant Download PDFInfo
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Abstract
The invention relates to a design method for optimizing the capacity of an emergency diesel generator of a pressurized water reactor nuclear power plant, which comprises the following steps: (1) analyzing and determining the function of the emergency diesel generator; (2) Splitting the function of the emergency diesel generator, and determining the capacity optimization principle of the emergency diesel generator according to the load type; (3) The method comprises the steps that the maximum allowable loading time of load equipment of the emergency diesel generator is analyzed, and the load loading time of the emergency diesel generator is optimally configured; (4) Based on the optimization principle, the loading capacity and the process step optimization of the emergency diesel generator are completed. The invention ensures the readiness of load calculation of the emergency diesel generator, reduces the capacity of the safety emergency diesel generator, reduces the purchase cost, and ensures that the loading time sequence of the loading equipment of the active pressurized water reactor nuclear power plant meets the loading requirement of the emergency diesel generator, so that the load of the emergency diesel engine can be loaded orderly.
Description
Technical Field
The invention belongs to the nuclear power station design technology, and particularly relates to a design method for optimizing the capacity of an emergency diesel generator of an active pressurized water reactor nuclear power plant.
Background
The emergency diesel generator set is used as an important in-plant power supply of the nuclear power plant, and is used for providing reliable power supply for safety-related equipment and other emergency loads required by the nuclear power plant when the active nuclear power plant loses the normal power supply outside the plant and the standby power supply outside the plant or other design reference accidents happen at the same time, ensuring the safe shutdown of the reactor and preventing the damage of important equipment caused by the power loss of a normal external power supply system.
At present, with the improvement of the power of a generator set of a third-generation nuclear power unit, the improvement of the design safety requirement of a nuclear power plant and the further improvement of serious accident prevention and relief measures of the nuclear power plant, the equipment and the loading time of the equipment which need to be powered by an emergency diesel generator set are greatly changed, so that the capacity of the emergency diesel generator is improved. The emergency diesel generator of the emergency diesel generator set of the active nuclear power plant is safety equipment, the purchase cost is high, and the increase of the capacity leads to the increase of the purchase cost. Based on the limitation of the capacity and load characteristics of the diesel generator set, the load loading of the emergency diesel generator needs to be optimized, including optimizing the capacity calculation, ensuring the capacity setting and calculation accuracy of the emergency diesel generator, ensuring the safety of the nuclear power plant and improving the economy of the set.
Disclosure of Invention
The invention aims to provide a design method for optimizing the capacity of an emergency diesel generator of a pressurized water reactor nuclear power plant, which ensures the safety function of an emergency diesel generator set, controls the capacity of the emergency diesel generator and reduces the cost.
The technical scheme of the invention is as follows: a design method for optimizing the capacity of an emergency diesel generator of a pressurized water reactor nuclear power plant comprises the following steps:
(1) Analyzing and determining the function of an emergency diesel generator;
(2) Splitting the function of the emergency diesel generator, and determining the capacity optimization principle of the emergency diesel generator according to the load type;
(3) The method comprises the steps that the maximum allowable loading time of load equipment of the emergency diesel generator is analyzed, and the load loading time of the emergency diesel generator is optimally configured;
(4) And (3) based on the optimization principle of the step (2) and the step (3), the loading capacity and the working step optimization of the emergency diesel generator are completed.
Further, according to the design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant, the functions of the emergency diesel generator in the step (1) include: under the condition of losing an off-site power supply, the off-site power supply comprises normal, fault and accident working conditions, each diesel generator set meets the power supply requirement of bringing a nuclear power unit to a safe shutdown state, guaranteeing the safety level function, and providing power supply capacity for the load supporting the safety level and the load of the non-safety level deep defense function related to the nuclear safety equipment; for the design expansion working condition (DEC-A working condition) caused by the loss of the external power supply, the emergency diesel generator should provide power for corresponding relieving measures; and also provides auxiliary functions for security load related functions that ensure personnel safety and equipment safety.
Further, according to the design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant, the load types in the step (2) comprise:
A nuclear security related device;
the nuclear safety equipment supports the system related load;
a device that is non-security level deep defensive (including nuclear auxiliary system) functions;
industrial security equipment.
Furthermore, in the design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant, in the step (2), for the nuclear safety related equipment, the capacity optimization principle of the emergency diesel generator comprises the following steps:
1.1 Based on accident analysis of three working conditions of off-site loss, triggering safety injection, off-site loss and triggering safety injection, the load required to be loaded on the emergency diesel generator is considered;
1.2 Equipment which does not operate simultaneously under the working condition of no operation of the power plant, and only the maximum load of different operation periods is required to be calculated when the capacity of the emergency diesel generator is calculated.
For the nuclear safety equipment supporting system related load, the capacity optimization principle of the emergency diesel generator comprises the following steps:
2.1 Analyzing the actual load demands of the equipment cooling water under different working conditions, wherein partial systems and equipment are not operated under the power failure, and isolating unnecessary loads under the power failure working conditions, so that the actual operating power of the equipment cooling pump is effectively reduced, and the calculated power of the equipment cooling pump in the emergency diesel generator is reduced;
2.2 For a ventilation system maintaining ambient temperature, the ventilation system cooling fan and the electric heater device are not used simultaneously, and only the maximum load of the two is calculated when the capacity of the emergency diesel generator is calculated; in a power plant with larger summer ventilation load, summer load (comprising ventilation/cold trap and boron heat tracing system load) can be calculated;
2.3 The load of the instrument control system is supplied by two distribution boards powered by the emergency diesel generator, the two power supplies are in redundant configuration, and when the total capacity of the emergency diesel generator is calculated, the load capacity of one distribution board can be calculated;
2.4 For supporting cold traps, the standby load may not account for the total capacity;
2.5 The heat dissipation capacity of the equipment after power failure is calculated in detail, the heat dissipation capacity of the actually operated load after power failure is used as the basis for calculating the capacity of the ventilation equipment, and the heat dissipation capacity of the equipment during normal operation is prevented from being calculated;
2.6 For a large number of intermittently operating loads, such as boron heat tracing systems, the power calculation of the plant is optimally calculated based on the time ratio of plant operation/shutdown under adverse conditions.
For loads of non-safety level deep defense (including nuclear auxiliary systems) functions, the emergency diesel generator capacity optimization principle includes:
3.1 For loads that are only used for design expansion conditions (design expansion conditions that are not due to loss of off-site), the load may be calculated as 0 regardless of the application under off-site conditions, although also powered by the emergency diesel generator.
For industrial security equipment, the capacity optimization principle of the emergency diesel generator comprises the following steps:
4.1 For the working condition of losing the external power of the factory and the safety injection or the working condition of losing the external power of the factory and the safety injection, the loading load is ensured to be the safety of the nucleus and the personnel, the minimum configuration of the safety of important equipment is ensured, and the redundant configuration for equipment protection is not loaded on the emergency diesel generator.
Furthermore, the design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant comprises the following steps of:
5.1 For the safety equipment or auxiliary support equipment required by the safety equipment, the loading time of the auxiliary support equipment meets the starting time requirement of the equipment in accident analysis, and meets the minimum time requirement of an accident development sequence;
5.2 For the equipment necessary for starting the diesel engine, the loading time of the equipment is required to ensure the normal starting of the diesel engine, and the equipment is loaded in the loading program 0 s;
5.3 Supporting the loading step delay of a system such as ventilation and cold source to meet the thermal inertia and emergency requirements of the environment or the system, and determining the time for loading to be delayed according to the requirements of the environment;
5.4 For security loads (loads for guaranteeing the safety of power plant equipment and personnel), loading time needs to be set based on the use requirement of the equipment, and the requirements of important equipment safety or personnel safety and the like need to be guaranteed;
5.5 The direct current and uninterrupted power supply system is provided with a storage battery, and the storage battery can be loaded in a delayed manner due to the arrangement;
5.6 For a partial load that does not require a control logic function and has a small capacity, loading at 0s can be considered in order to avoid adding a large amount of control logic.
The beneficial effects of the invention are as follows: in order to reduce the capacity of the safety emergency diesel generator and expensive purchase cost, the invention provides an analysis method for determining the loading capacity optimization of the emergency diesel generator, comprising calculation optimization, for a newly built active pressurized water reactor nuclear power plant, and ensures the readiness of the load calculation of the emergency diesel generator. In order to ensure that the loading time sequence of the loading equipment of the active pressurized water reactor nuclear power plant meets the loading requirement of the emergency diesel generator and enable the load of the emergency diesel engine to be loaded orderly, the invention provides an analysis method of the maximum running time of the loading time sequence of the loading equipment. The invention can be used for guiding the design of capacity calculation optimization of the emergency diesel generator set.
Drawings
FIG. 1 is a flow chart of a design method for calculating loading capacity of an emergency diesel generator of an active pressurized water reactor nuclear power plant.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a design method for optimizing the capacity of an emergency diesel generator of an active pressurized water reactor nuclear power plant, which aims to ensure the safety function of an emergency diesel generator set and control the capacity of the emergency diesel generator, reduce the cost and solve the following problems in the design of a loading program of the emergency diesel generator of the active nuclear power plant:
1) The purchase cost of the safety-grade emergency diesel generator is high, and the capacity of the safety-grade emergency diesel generator is reduced in order to effectively reduce the purchase cost;
2) In order to optimize the capacity of the emergency diesel generator in a calculation mode, loading and capacity optimization principles of different types of loads need to be determined;
3) In the loading procedure, the loading time of the equipment is often an important factor for limiting the capacity of the diesel generator, so that the maximum allowable loading time of the loaded equipment of the emergency diesel generator needs to be analyzed, and the loading time of the load is optimized to prevent the excessive loading capacity of certain steps from limiting the total capacity of the emergency diesel generator.
As shown in FIG. 1, the design method for calculating the loading capacity of the emergency diesel generator of the active pressurized water reactor nuclear power plant provided by the invention comprises the following steps:
(1) And analyzing and determining the function of the emergency diesel generator.
The emergency diesel generator of the active pressurized water reactor nuclear power plant has the following functions after carding:
Under the condition of losing the off-site power supply, normal, fault and accident working conditions (design reference accidents) are included, each diesel generator set meets the power supply requirement of bringing the nuclear power unit to a safe shutdown state, guaranteeing the safety level function, and providing power supply capacity for the related supporting load (such as electricity, water, gas, ventilation and the like) of the nuclear safety equipment and the load of the non-safety level deep defense function. For the design expansion working condition (DEC-A working condition) caused by the loss of the external power supply, the emergency diesel generator should provide power for corresponding relieving measures.
In addition, the emergency diesel generator is also capable of providing auxiliary functions for security load related functions that ensure personnel safety and equipment safety.
(2) And determining the capacity optimization principle of the emergency diesel generator according to the load type.
The emergency diesel generator is split in function, and the load of the emergency diesel generator can be divided into the following four types:
A nuclear security related device;
the nuclear safety equipment supports the system related load;
a device that is non-security level deep defensive (including nuclear auxiliary system) functions;
industrial security equipment.
Based on the functional classification of the emergency diesel generator, determining an optimization principle of capacity calculation of the emergency diesel generator:
1) Nuclear security related devices:
Principle 1.1): based on accident analysis of three working conditions of off-site loss, triggering safety injection and off-site loss, the load required to be loaded on the emergency diesel generator is considered;
Principle 1.2): the power plant is not operated under the working condition and is not operated simultaneously, and the maximum load of different operation periods is only required to be calculated when the capacity of the emergency diesel generator is calculated.
Principle 1.2 is a general rule which is also applicable to other types of functional loads.
2) The nuclear security device supports system-related loads:
principle 2.1): the actual load demands of cold water under different working conditions are analyzed, partial systems and equipment are not operated under the power failure, and unnecessary loads are isolated under the power failure working conditions, so that the actual operating power of the cold pump can be effectively reduced, and the calculated power of the cold pump in the emergency diesel generator can be reduced;
Principle 2.2): for a ventilation system maintaining the ambient temperature, the cooling fan and the electric heater device of the ventilation system are not used at the same time, and only the maximum load of the cooling fan and the electric heater device is calculated when the capacity of the emergency diesel generator is calculated; in a power plant with larger summer ventilation load, summer load (comprising ventilation/cold trap and boron heat tracing system load) can be calculated;
Principle 2.3): the load of the instrument control system is supplied by two distribution boards powered by the emergency diesel generator, the two power supplies are in redundant configuration, and when the total capacity of the emergency diesel generator is calculated, the load capacity of one distribution board can be calculated;
Principle 2.4): for supporting cold traps, the standby load may not account for the total capacity;
principle 2.5): the heat dissipation capacity of the equipment after power failure is calculated in detail, the heat dissipation capacity of the actually operated load after power failure is used as the basis for calculating the capacity of the ventilation equipment, and the heat dissipation capacity of the equipment during normal operation is prevented from being calculated;
Principle 2.6): for a large number of intermittently operated loads, such as boron heat tracing systems, the power calculation of the equipment is optimally calculated according to the time ratio of operation/shutdown of the equipment under adverse conditions.
3) Load of non-security level deep defense (including nuclear auxiliary system) functions:
Principle 3.1): for loads that are only used for design expansion conditions (design expansion conditions that are not due to loss of off-site), the load may be calculated as 0 regardless of the application under off-site conditions, although also powered by the emergency diesel generator.
4) Industrial security equipment:
Principle 4.1): for the working condition of losing the external power of the factory and the safety injection or the working condition of losing the external power of the factory and the safety injection, the loading load is ensured to be the safety of the core and the personnel, the minimum configuration of the safety of important equipment is ensured, and the redundant configuration for equipment protection is not loaded on the emergency diesel generator.
The power plant capacity calculation is optimized based on the above principles to determine the total capacity of the emergency diesel generator.
(3) And carrying out optimal configuration on the load loading time of the emergency diesel generator by analyzing the maximum allowable loading time of the load loading equipment of the emergency diesel generator. The specific principle is as follows:
Principle 5.1): for the safety equipment or auxiliary support equipment required by the safety equipment, the loading time of the auxiliary support equipment meets the starting time requirement of the equipment in accident analysis, and meets the minimum time requirement of an accident development sequence;
principle 5.2): for equipment necessary for starting the diesel engine, the loading time of the equipment is required to ensure the normal starting of the diesel engine, and the equipment is loaded in a loading program 0 s;
Principle 5.3): the loading step delay of the support system such as ventilation and cold source needs to meet the thermal inertia and emergency requirements of the environment or the system, and the time for delaying loading can be determined according to the requirements of the environment;
Principle 5.4): for security loads (loads for guaranteeing the safety of power plant equipment and personnel), loading time needs to be set based on the use requirement of the equipment, and the requirements of important equipment safety or personnel safety and the like need to be guaranteed;
Principle 5.5): the direct current and uninterrupted power supply system is provided with the storage battery, and the storage battery can be loaded in a delayed manner due to the arrangement;
Principle 5.6): for a partial load that does not require a control logic function and has a small capacity, loading at 0s can be considered in order to avoid adding a large amount of control logic.
And optimizing the loading process step of the emergency diesel generator equipment according to the principle.
(4) And (3) the optimization result is applied to complete the optimization of the loading capacity and the working steps of the emergency diesel generator.
Examples
(1) Analysis and determination of the function of an emergency diesel generator
Taking an emergency diesel generator of a certain power plant as an example, the emergency diesel generator of the power plant has the following functions:
Under the condition of losing the off-site power supply, normal, fault and accident working conditions (design reference accidents) are included, each diesel generator set meets the power supply requirement of bringing the nuclear power unit to a safe shutdown state, guaranteeing the safety level function, and providing power supply capacity for the related supporting load (such as electricity, water, gas, ventilation and the like) of the nuclear safety equipment and the load of the non-safety level deep defense function. For the design expansion working condition (DEC-A working condition) caused by the loss of the external power supply, the emergency diesel generator should provide power for corresponding relieving measures.
In addition, the emergency diesel generator is also capable of providing auxiliary functions for security load related functions that ensure personnel safety and equipment safety.
(2) And determining the capacity optimization principle of the emergency diesel generator according to the load type.
Based on the functional classification of emergency diesel generators, the load of a certain active nuclear power plant is divided into the following four types:
A nuclear security related device;
the nuclear safety equipment supports the system related load;
a device that is non-security level deep defensive (including nuclear auxiliary system) functions;
industrial security equipment.
The following optimization is carried out according to the emergency diesel generator capacity calculation optimization method:
1) Nuclear security related devices:
Principle 1.1): the actual power is calculated by the circulating fan of the control rod cooling system under the conditions of external power loss and safety injection, but under the conditions of external power loss, safety injection and safety injection, the equipment is not applied any more due to containment isolation, and the calculated power is 0;
principle 1.2): the auxiliary water supply pump and the normal waste heat discharge pump are applied to different modes of the nuclear power plant, and only the maximum capacity of the auxiliary water supply pump and the normal waste heat discharge pump is counted when the capacity of the diesel generator is calculated.
2) The nuclear security device supports system-related loads:
principle 2.1): the three-waste system and the equipment such as a refrigerating water system of an operating factory building are not operated under the power-off working condition, and after relevant loads are isolated, the actual operating power of the cold pump can be effectively reduced, and the calculation capacity of the cold pump in the emergency diesel generator is reduced;
Principle 2.2): when the ventilation system between the instrument control cabinets calculates the capacity of the emergency diesel generator, only the capacity of the cooling fan is calculated, and the capacity of the electric heater is not calculated any more;
Principle 2.3): the non-safety-level cabinet, the safety-level cabinet and the computer information control system cabinet of the nuclear power plant adopt two power supply paths of distribution boards powered by the emergency diesel generator, the two power supply paths are in redundant configuration, and when the total capacity of the emergency diesel generator is calculated, the calculation capacity of one path of distribution board is optimized;
principle 2.4): the annular space exhaust fan is used for one standby when running, and the standby fan does not count the total capacity of the emergency diesel generator;
principle 2.5): the heat dissipation capacity of the ventilation system of the safety factory building mechanical equipment area, the ventilation system among the electrical cabinets, the ventilation system among the control cabinets and the ventilation system of the cable layer is reduced, the requirement on ventilation air quantity is reduced, and the calculation power of the fan and the cold source equipment can be correspondingly reduced;
Principle 2.6): the boron heat tracing system can optimize power calculation according to a time ratio curve of operation/shutdown of the boron heat tracing electric heater equipment, and the power calculation is optimized to be 0.5 times of actual power under the conservative condition.
3) Non-security level deep defenses (including nuclear auxiliary systems) devices:
Principle 3.1): for equipment applied in severe accidents, such as a reactor core injection pump, which is hung on an emergency diesel generator, the operation of the reactor core injection pump is not considered under the design reference working condition of losing the outside of the factory in consideration of the severe accident working condition, so that the calculation capacity of the reactor core injection pump can be 0 when the capacity of the emergency diesel generator is calculated.
4) Industrial security equipment:
Principle 4.1): after the external power of the turbine is lost, a main oil pump (without a power supply) driven by a main shaft of the turbine is used for triggering the turbine to jump, lubricating oil is provided for an oil turbine, and after the rotating speed of the turbine reaches 1000r/min, the oil pressure provided by the main oil pump is insufficient, and a turning oil pump is required to be started; in addition, a direct current accident oil pump is provided as a backup of the jigger oil pump. The direct current accident oil pump is only used as a backup of the jigger oil pump. And under the working conditions of off-site electricity and safety injection or off-site electricity and safety injection, the UPS main cabinet power supply for supplying power to the direct current accident oil pump can be canceled, and the capacity of the emergency diesel generator is optimized.
(3) And analyzing the maximum allowable loading time of the load equipment of the emergency diesel generator, and optimally configuring the load loading time of the emergency diesel generator.
Principle 5.1): for example, an injection pump, for a loss of superimposed injection triggering condition to an off-site normal power supply and an off-site backup power supply, accident analysis requires that the injection pump establish full flow 28 seconds after an injection signal is triggered. Considering the loading time of the emergency diesel generator to be 15s, the time from starting to establishing the full flow of the safety injection pump to be 5s, and considering the loading program and the time of the instrument control time delay, the safety injection pump should be loaded within 3s, so that the loading time of the safety injection pump needs to be set to be 0s;
Principle 5.2): for example, an emergency diesel generator fuel booster pump belongs to diesel engine loading auxiliary equipment and needs to be loaded for 0 s;
principle 5.3): for example, the chilled water system of the electric plant has certain thermal inertia, and the chilled water circulating pump can be loaded at 40 seconds;
Principle 5.4): for example, in order to protect the main pump, the loading time of the top shaft oil pump is within 5s according to the requirements of a main pump supplier;
Principle 5.5): the direct current and uninterrupted power supply system is provided with a storage battery, and the storage battery can provide power when in power failure, so that the loading can be delayed;
Principle 5.6): for less loaded valves and electric heaters, loading at 0s may be considered to avoid adding a significant amount of control logic.
(4) And (3) applying the optimization result to guide the completion of the loading capacity and the step optimization of the emergency diesel generator.
It will be apparent to those skilled in the art that the structure of the present invention is not limited to the details of the above-described exemplary embodiments, but the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (3)
1. A design method for optimizing the capacity of an emergency diesel generator of a pressurized water reactor nuclear power plant comprises the following steps:
(1) Analyzing and determining the function of an emergency diesel generator;
(2) Splitting the function of the emergency diesel generator, and determining the capacity optimization principle of the emergency diesel generator according to the load type; the load types include: a nuclear safety-related device, a device for supporting system-related load by the nuclear safety device, a device for non-safety-level deep defense function including a nuclear auxiliary system, and an industrial security device;
for nuclear safety related devices, the emergency diesel generator capacity optimization principles include:
1.1 Based on accident analysis of three working conditions of off-site loss, triggering safety injection and off-site loss, triggering safety injection, the load required to be loaded on the emergency diesel generator is considered;
1.2 Equipment which does not operate simultaneously under different operating conditions of the power plant, and only the maximum load of different operating periods is required to be calculated when the capacity of the emergency diesel generator is calculated;
For the nuclear safety equipment supporting system related load, the capacity optimization principle of the emergency diesel generator comprises the following steps:
2.1 Analyzing the actual load demands of the equipment cooling water under different working conditions, wherein partial systems and equipment are not operated under the power failure, and isolating unnecessary loads under the power failure working conditions, so that the actual operating power of the equipment cooling pump is effectively reduced, and the calculated power of the equipment cooling pump in the emergency diesel generator is reduced;
2.2 For a ventilation system maintaining ambient temperature, the ventilation system cooling fan and the electric heater device are not used simultaneously, and only the maximum load of the two is calculated when the capacity of the emergency diesel generator is calculated; calculating summer load in a power plant with larger summer ventilation load proved by the power plant;
2.3 The load of the instrument control system is supplied by two distribution boards powered by the emergency diesel generator, the two power supplies are in redundant configuration, and when the total capacity of the emergency diesel generator is calculated, the load capacity of one distribution board is calculated;
2.4 For supporting cold traps, the standby load does not account for the total capacity;
2.5 The heat dissipation capacity of the equipment after power failure is calculated in detail, the heat dissipation capacity of the actually operated load after power failure is used as the basis for calculating the capacity of the ventilation equipment, and the heat dissipation capacity of the equipment during normal operation is prevented from being calculated;
2.6 For a large number of loads of intermittent operation, optimizing the power calculation of the equipment according to the time ratio of the operation/the shutdown of the equipment under unfavorable conditions;
For loads that include unsafe deep defensive functions of the nuclear assistance system, the emergency diesel generator capacity optimization principles include:
3.1 For loads only used for design expansion conditions caused by non-loss off-site electricity, although also powered by the emergency diesel generator, the load is calculated to be 0 regardless of the application under the off-site electricity loss condition;
for industrial security equipment, the capacity optimization principle of the emergency diesel generator comprises the following steps:
4.1 For the working condition of losing the external power of the factory and the safety injection or the working condition of losing the external power of the factory and the safety injection, the loading load is ensured to be the safety of the core and the personnel, the minimum configuration of the safety of important equipment is ensured, and the redundant configuration for equipment protection is not loaded on the emergency diesel generator;
(3) The method comprises the steps that the maximum allowable loading time of load equipment of the emergency diesel generator is analyzed, and the load loading time of the emergency diesel generator is optimally configured;
(4) And (3) based on the optimization principle of the step (2) and the step (3), the loading capacity and the working step optimization of the emergency diesel generator are completed.
2. The method for optimizing the capacity of an emergency diesel generator in a pressurized water reactor nuclear power plant according to claim 1, wherein the functions of the emergency diesel generator in step (1) include: under the condition of losing an off-site power supply, the off-site power supply comprises normal, fault and accident working conditions, each diesel generator set meets the power supply requirement of bringing a nuclear power unit to a safe shutdown state, guaranteeing the safety level function, and providing power supply capacity for the load supporting the safety level and the load of the non-safety level deep defense function related to the nuclear safety equipment; for the design expansion working condition caused by the loss of the external power supply, the emergency diesel generator should provide power for corresponding relieving measures; and also provides auxiliary functions for security load related functions that ensure personnel safety and equipment safety.
3. The method for optimizing the capacity of an emergency diesel generator in a pressurized water reactor nuclear power plant according to claim 1 or 2, wherein the principle of optimizing the load loading time of the emergency diesel generator in the step (3) comprises the following steps:
5.1 For the safety equipment or auxiliary support equipment required by the safety equipment, the loading time of the auxiliary support equipment meets the starting time requirement of the equipment in accident analysis, and meets the minimum time requirement of an accident development sequence;
5.2 For the equipment necessary for starting the diesel engine, the loading time of the equipment is required to ensure the normal starting of the diesel engine, and the equipment is loaded in the loading program 0 s;
5.3 Supporting the loading step delay of the system to meet the thermal inertia and emergency requirements of the environment or the system, and determining the time for delaying loading according to the requirements of the environment;
5.4 For security loads, loading time is required to be set based on the use requirement of equipment, and time requirements of important equipment safety or personnel safety are required to be ensured;
5.5 The direct current and uninterrupted power supply system is provided with a storage battery, and the storage battery can be loaded in a delayed manner due to the arrangement;
5.6 For a partial load that does not require a control logic function and has a small capacity, the load is 0s in order to avoid adding a large amount of control logic.
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