CN113704962A - Design method for optimizing load of emergency diesel generator set of pressurized water reactor nuclear power plant - Google Patents
Design method for optimizing 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 capacity optimization 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) optimizing and configuring the load loading time of the emergency diesel generator by analyzing the maximum allowable load loading time of the emergency diesel generator load-carrying equipment; (4) based on the optimization principle, the loading capacity and the working step optimization of the emergency diesel generator are completed. The method ensures the readiness of the emergency diesel generator load calculation, reduces the capacity of the safety-level emergency diesel generator, reduces the purchase cost, 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, and ensures that the load of the emergency diesel engine can be loaded in order.
Description
Technical Field
The invention belongs to the nuclear power plant design technology, and particularly relates to a capacity optimization design method for an emergency diesel generator of an active pressurized water reactor nuclear power plant.
Background
The emergency diesel generator set is used as an important on-site 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 an off-site normal power supply and an off-site standby power supply or other design basis accidents happen simultaneously, so that the safe shutdown of a reactor is ensured, and the damage of important equipment caused by the power loss of a normal external power supply system is prevented.
At present, with the improvement of the power of a generator set of a third generation nuclear power generating set, the improvement of the design safety requirement of a nuclear power plant and the further improvement of serious accident prevention and mitigation measures of the nuclear power plant, equipment needing power supply of an emergency diesel generator set and equipment loading time are greatly changed, so that the capacity of the emergency diesel generator is improved. The emergency diesel generator of the active nuclear power plant emergency diesel generator set is a safety-level device, the purchase cost is high, and the increase of the capacity leads to the increase of the purchase cost. Based on the limitations of the capacity and the load characteristics of the diesel generator set, the load of the emergency diesel generator needs to be optimized, capacity calculation is optimized, the accuracy of capacity setting and calculation of the emergency diesel generator is guaranteed, the safety of a nuclear power plant is guaranteed, and the economy of the set is improved.
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 the 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 capacity optimization of an emergency diesel generator of a pressurized water reactor nuclear power plant 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) optimizing and configuring the load loading time of the emergency diesel generator by analyzing the maximum allowable load loading time of the emergency diesel generator load-carrying equipment;
(4) and (4) finishing the loading capacity and the working step optimization of the emergency diesel generator based on the optimization principle of the step (2) and the step (3).
Further, according to the design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant, in the step (1), the functions of the emergency diesel generator include: under the condition of loss of power outside a plant, including normal, fault and accident conditions, each diesel generating set meets the requirements of bringing the nuclear generating set to a safe shutdown state, ensuring the power supply requirement of a safety level function and providing power supply capacity for supporting loads related to nuclear safety equipment and loads with a non-safety level depth defense function; for a design expansion working condition (DEC-A working condition) caused by the loss of an external power supply, the emergency diesel generator supplies power for corresponding relieving measures; and also provides an auxiliary function of a security load related function for ensuring personnel safety and equipment safety.
Further, according to the above design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant, the load types in step (2) include:
a nuclear security-related device;
the nuclear safety equipment supports system related loads;
devices for non-security level defense in depth (including nuclear-assisted systems) functions;
industrial security equipment.
Further, according to 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 emergency diesel generator capacity optimization principle includes:
1.1) considering the load needing to be loaded on the emergency diesel generator based on accident analysis of three working conditions of loss of off-plant electricity, loss of off-plant electricity + triggering safety injection and loss of off-plant electricity + triggering safety injection;
1.2) equipment which does not run simultaneously under the condition that the power plant does not run, and the maximum load of different running periods is only required to be calculated when the capacity of the emergency diesel generator is calculated.
For the nuclear safety equipment to support the system-related loads, the emergency diesel generator capacity optimization principle comprises the following steps:
2.1) analyzing the actual load demand of the equipment cooling water under different working conditions, wherein the system and the equipment under the power-off condition do not run any more, and isolating the unnecessary load under the power-off working condition, thereby effectively reducing the actual running power of the equipment cooling pump and reducing the calculated power of the equipment cooling pump in the emergency diesel generator;
2.2) for the ventilation system keeping the ambient temperature, the cooling fan and the electric heater device of the ventilation system are not used simultaneously, and only the maximum load of the cooling fan and the electric heater device is calculated during the calculation of the capacity of the emergency diesel generator; in a power plant which proves that the ventilation load of the power plant is larger in summer, the summer load (comprising ventilation/cold trap and boron heat tracing system load) can be calculated;
2.3) the loads of the instrument control system are supplied with power by two paths of distribution boards supplied with power by emergency diesel generators, the two paths of power supplies are in redundant configuration, and when the total capacity of the emergency diesel generators is calculated, the load capacity of one path of distribution board can be calculated;
2.4) for supporting cold traps, the spare load can not account for the total capacity;
2.5) calculating the heat dissipation capacity of the equipment after power loss in detail, and taking the heat dissipation capacity of the actual operation load after power loss as the basis of the capacity calculation of the ventilation equipment to avoid calculating the heat dissipation capacity of the equipment in normal operation;
2.6) for a large number of intermittently operating loads, such as boron tracing systems, the power calculation of the plant is optimally calculated according to the run/shut down time ratio of the plant under adverse conditions.
For loads of non-safety level defense in depth (including nuclear auxiliary system) functions, the emergency diesel generator capacity optimization principle comprises the following steps:
3.1) for loads only used for design expansion (not the design expansion caused by the loss of off-plant electricity), although also powered by the emergency diesel generator, the load can be calculated as 0 regardless of the application in the loss of off-plant electricity.
For industrial security equipment, the capacity optimization principle of the emergency diesel generator comprises the following steps:
4.1) to losing the external power of factory + safety injection operating mode or losing the external power of factory + safety injection + safety and spouting the operating mode, belong to II class I or IV class operating mode, the loading load should guarantee nuclear safety, personnel's safety to guarantee the minimum configuration of major equipment safety, no longer load at emergent diesel generator to the redundant configuration of equipment protection.
Further, in the above design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant, the principle of optimally configuring the load loading time of the emergency diesel generator in the step (3) includes:
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 requirement on the starting time of the equipment in accident analysis and meets the minimum time requirement of an accident development sequence;
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 required to be loaded in a loading program of 0 s;
5.3) the loading step delay of the support system such as ventilation and cold sources needs to meet the thermal inertia and urgency requirements of the environment or the system, and the time for delaying loading can be determined according to the environment requirements;
5.4) for security loads (loads for ensuring the safety of power plant equipment and personnel), the loading time needs to be set based on the use requirement of the equipment, and the time requirements such as important equipment safety or personnel safety need to be ensured;
5.5) the direct current and uninterrupted power system is provided with a storage battery, and the delayed loading can be realized due to the arrangement of the storage battery;
5.6) for a partial load with a small capacity, in which a control logic function is not necessarily provided, it is considered to load at 0s in order to avoid an increase in a large amount of control logic.
The invention has the following beneficial effects: in order to reduce the capacity of a safety-level emergency diesel generator and reduce expensive procurement cost, the invention provides an analysis method for determining the optimization of the loading capacity of the emergency diesel generator and including calculation optimization for a newly-built active pressurized water reactor nuclear power plant, and the preparation of the load calculation of the emergency diesel generator is ensured. 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 an emergency diesel generator and enable the load of an emergency diesel engine to be loaded orderly, the invention provides an analysis method for the maximum running time of the loading time sequence of the loading equipment. The method can be used for guiding the design of the capacity calculation optimization of the emergency diesel generating set.
Drawings
FIG. 1 is a flow chart of a design method for calculating the loading capacity of an emergency diesel generator of an active pressurized water reactor nuclear power plant according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit 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 the emergency diesel generator set, control the capacity of the emergency diesel generator and reduce the cost, and the following problems are required to be solved when a loading program of the emergency diesel generator of the active pressurized water reactor nuclear power plant is designed:
1) the purchase cost of the safety-level emergency diesel generator is high, and in order to effectively reduce the purchase cost, the capacity of the safety-level emergency diesel generator is reduced;
2) in order to optimize the capacity of the emergency diesel generator in a calculation mode, the 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 emergency diesel generator loaded equipment needs to be analyzed, and the loading time of the load needs to be optimized so as to prevent the total capacity of the emergency diesel generator from being limited by the overlarge loading capacity of certain steps.
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.
Through carding, the active pressurized water reactor nuclear power plant emergency diesel generator has the following functions:
under the condition of loss of the power supply outside the plant, including normal, fault and accident conditions (design basis accident), each diesel generator set meets the requirements of bringing the nuclear power generator set to a safe shutdown state, ensuring the power supply requirement of a safety level function, and providing power supply capacity for supporting loads (such as electricity, water, gas, ventilation and the like) related to nuclear safety equipment and loads with a non-safety level deep defense function. For the design expansion working condition (DEC-A working condition) caused by the loss of the power supply outside the plant, the emergency diesel generator supplies power for corresponding relieving measures.
In addition, the emergency diesel generator is also required to provide auxiliary functions of security load related functions for ensuring personnel safety and equipment safety.
(2) And determining the capacity optimization principle of the emergency diesel generator according to the load type.
The function of the emergency diesel generator is split, 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 system related loads;
devices for non-security level defense in depth (including nuclear-assisted systems) functions;
industrial security equipment.
Determining an optimization principle of emergency diesel generator capacity calculation based on the functional classification of the emergency diesel generator:
1) nuclear security related devices:
principle 1.1): the load required to be loaded on the emergency diesel generator is considered based on accident analysis of three working conditions of loss of off-plant electricity, loss of off-plant electricity + triggering safety injection and loss of off-plant electricity + triggering safety injection;
principle 1.2): when the capacity of the emergency diesel generator is calculated, only the maximum load of different operation periods needs to be calculated.
Principle 1.2 is a general criterion, which is also applicable to other types of functional loads.
2) The nuclear safety equipment supports system related loads:
principle 2.1): analyzing the actual load demand of the cooling water under different working conditions, avoiding the operation of the power-loss lower part system and equipment, and isolating the unnecessary load under the power-loss working condition, thereby effectively reducing the actual operation power of the cooling pump and reducing the calculation power of the cooling pump in the emergency diesel generator;
principle 2.2): for a ventilation system keeping the ambient temperature, a cooling fan and an electric heater device of the ventilation system are not used simultaneously, and only the maximum load of the cooling fan and the electric heater device is calculated during the calculation of the capacity of the emergency diesel generator; in a power plant which proves that the ventilation load of the power plant is larger in summer, the summer load (comprising ventilation/cold trap and boron heat tracing system load) can be calculated;
principle 2.3): the instrument control system loads are supplied with power by two paths of distribution boards supplied with power by emergency diesel generators, the two paths of power supplies are in redundant configuration, and when the total capacity of the emergency diesel generators is calculated, the load capacity of one path of distribution board can be calculated;
principle 2.4): for supporting cold traps, the backup load may not account for total capacity;
principle 2.5): the method comprises the steps of calculating the heat dissipation capacity of equipment after power failure in detail, and avoiding calculating the heat dissipation capacity of the equipment in normal operation by taking the heat dissipation capacity of an actual operation load after power failure as the basis of the capacity calculation of the ventilation equipment;
principle 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 operation/shutdown of the plant under adverse conditions.
3) Load of non-security level defense in depth (including nuclear-assisted system) functions:
principle 3.1): for a load only for a design expansion condition (a design expansion condition caused by non-loss of off-plant electricity), although power is supplied by an emergency diesel generator, the load does not consider the application under the loss of off-plant electricity condition, and the calculation load can be calculated to be 0.
4) Industrial security equipment:
principle 4.1): for the working conditions of loss of external power and safety injection or the working conditions of loss of external power, safety injection and safety injection, the working conditions belong to the III or IV working conditions, the loading load should ensure the nuclear safety and the personnel safety and the minimum configuration of the safety of major equipment, and the redundant configuration for equipment protection is not loaded on the emergency diesel generator any more.
And optimizing the capacity calculation of the power plant based on the principle to determine the total capacity of the emergency diesel generator.
(3) And optimally configuring the load loading time of the emergency diesel generator by analyzing the maximum allowable loading time of the on-load 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 requirement on the starting time 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 required to be loaded in a loading program of 0 s;
principle 5.3): the loading process delay of a support system such as ventilation and a cold source needs to meet the requirements of thermal inertia and urgency 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 ensuring the safety of power plant equipment and personnel), the loading time needs to be set based on the use requirements of the equipment, and the time requirements such as important equipment safety or personnel safety need to be ensured;
principle 5.5): the direct current and uninterrupted power system is provided with a storage battery, and the delayed loading can be realized due to the arrangement of the storage battery;
principle 5.6): for a part load with a small capacity, in which a control logic function is not necessarily provided, it is considered to load at 0s in order to avoid an increase in a large amount of control logic.
And optimizing the loading step of the emergency diesel generator equipment according to the principle.
(4) And (4) applying the optimization results to complete the loading capacity and the process step optimization of the emergency diesel generator.
Examples
(1) Analyzing and determining 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 after being combed:
under the condition of loss of the power supply outside the plant, including normal, fault and accident conditions (design basis accident), each diesel generator set meets the requirements of bringing the nuclear power generator set to a safe shutdown state, ensuring the power supply requirement of a safety level function, and providing power supply capacity for supporting loads (such as electricity, water, gas, ventilation and the like) related to nuclear safety equipment and loads with a non-safety level deep defense function. For the design expansion working condition (DEC-A working condition) caused by the loss of the power supply outside the plant, the emergency diesel generator supplies power for corresponding relieving measures.
In addition, the emergency diesel generator is also required to provide auxiliary functions of security load related functions for ensuring 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, loads of an active nuclear power plant are divided into the following four types:
a nuclear security-related device;
the nuclear safety equipment supports system related loads;
devices for non-security level defense in depth (including nuclear-assisted systems) 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 control rod cooling system circulating fan counts the actual power under the working conditions of power loss outside the plant and power loss + safety injection, but under the working conditions of power loss + safety injection outside the plant, the equipment is not applied any more due to the isolation of the containment vessel, and the counted power is 0;
principle 1.2): the auxiliary water feeding pump and the normal waste heat discharging pump are applied to different modes of a nuclear power plant, and only the maximum capacity of the auxiliary water feeding pump and the normal waste heat discharging pump is counted when the capacity of the diesel generator is calculated.
2) The nuclear safety equipment supports system related loads:
principle 2.1): under the power-off working condition, equipment such as a three-waste system, a chilled water system of an operating factory building and the like do not run any more, and after relevant loads are isolated, the actual running power of a cooling pump can be effectively reduced, and the calculated capacity of the cooling pump in an 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;
principle 2.3): the nuclear power plant non-safety cabinet, the safety cabinet and the computer information control system cabinet adopt two paths of distribution boards supplied with power by an emergency diesel generator, the two paths of power supplies are in redundant configuration, and when the total capacity of the emergency diesel generator is calculated, the calculated capacity of one path of distribution board is optimized;
principle 2.4): the annular space exhaust fan is one-used one-standby when in operation, and the standby fan does not account for the total capacity of the emergency diesel generator;
principle 2.5): the heat dissipation capacity of a ventilation system of a mechanical equipment area of a safe workshop after power failure, a ventilation system between electrical cabinets, a ventilation system between control cabinets and a ventilation system of a cable layer is reduced, the requirement on ventilation air volume is reduced, and the calculation power of a fan and cold source equipment can be correspondingly reduced;
principle 2.6): the boron heat tracing system can optimize the power calculation according to the operation/shutdown time ratio curve of the boron heat tracing electric heater equipment, and the power calculation is optimized to be 0.5 times of the actual power under conservative conditions.
3) Non-security level defense in depth (including nuclear-assisted systems) devices:
principle 3.1): for equipment applied in a severe accident, such as a core injection pump, which is hung on an emergency diesel generator, the calculated capacity of the core injection pump may be counted as 0 when calculating the capacity of the emergency diesel generator, considering that the equipment should be operated in a severe accident condition and not considering that the equipment is put into operation in a design reference condition of losing power outside the plant.
4) Industrial security equipment:
principle 4.1): after the power outside the plant is lost, a turbine trip is triggered, a main oil pump (without a power supply) driven by a main shaft of the turbine supplies lubricating oil to an oil turbine, and after the rotating speed of the turbine reaches 1000r/min, the oil pressure supplied by the main oil pump is insufficient, and a turning oil pump needs to be started; in addition, a direct current emergency oil pump is provided as a backup for the barring oil pump. The oil pump only serves as a backup of the barring oil pump due to the direct current accident. The UPS main machine cabinet power supply for supplying power to the direct-current accident oil pump can be cancelled under the working condition of loss of external power and safety injection or the working condition of loss of external power, safety injection and safety injection, and the capacity of the emergency diesel generator is optimized.
(3) And analyzing the maximum allowable loading time of the emergency diesel generator loading equipment, and optimally configuring the emergency diesel generator load loading time.
Principle 5.1): for example, for a safety injection pump, for a normal power supply outside a plant and a standby power supply outside the plant, which lose superposition of safety injection triggering conditions, accident analysis requires that the safety injection pump establish full flow 28s before a safety injection signal is triggered. Considering the loading time of an emergency diesel generator to be 15s, the time from starting to establishing full flow of the safety injection pump is 5s, and considering the time of loading programs and instrument control delay, the safety injection pump is loaded within 3s, so the loading time of the safety injection pump is required to be set to be 0 s;
principle 5.2): for example, a fuel booster pump of an emergency diesel generator belongs to diesel engine loading auxiliary equipment and needs to be loaded within 0 s;
principle 5.3): for example, the chilled water system of the electric plant has certain thermal inertia, so that the chilled water circulating pump can be loaded within 40 s;
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 requirement of a main pump supplier;
principle 5.5): the direct current and uninterrupted power system is provided with a storage battery, and the storage battery can provide power when the system is out of power, so that delayed loading can be realized;
principle 5.6): for less loaded valves and electric heaters, to avoid adding a large amount of control logic, loading at 0s may be considered.
(4) And (4) applying the optimization results to guide and complete the loading capacity and the process step optimization of the emergency diesel generator.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A design method for capacity optimization of an emergency diesel generator of a pressurized water reactor nuclear power plant 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) optimizing and configuring the load loading time of the emergency diesel generator by analyzing the maximum allowable load loading time of the emergency diesel generator load-carrying equipment;
(4) and (4) finishing the loading capacity and the working step optimization of the emergency diesel generator based on the optimization principle of the step (2) and the step (3).
2. The design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant according to claim 1, wherein the functions of the emergency diesel generator in the step (1) comprise: under the condition of loss of power outside a plant, including normal, fault and accident conditions, each diesel generating set meets the requirements of bringing the nuclear generating set to a safe shutdown state, ensuring the power supply requirement of a safety level function and providing power supply capacity for supporting loads related to nuclear safety equipment and loads with a non-safety level depth defense function; for the design expansion working condition caused by the loss of the power supply outside the plant, the emergency diesel generator provides power supply for corresponding relieving measures; and also provides an auxiliary function of a security load related function for ensuring personnel safety and equipment safety.
3. The design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant according to claim 1 or 2, wherein the load type in the step (2) comprises:
a nuclear security-related device;
the nuclear safety equipment supports system related loads;
equipment with a non-security level defense-in-depth function comprising a nuclear auxiliary system;
industrial security equipment.
4. The design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant according to claim 3, wherein in the step (2), for the nuclear safety-related equipment, the emergency diesel generator capacity optimization principle comprises the following steps:
1.1) considering the load needing to be loaded on the emergency diesel generator based on accident analysis of three working conditions of loss of off-plant electricity, loss of off-plant electricity + triggering safety injection and loss of off-plant electricity + triggering safety injection;
1.2) equipment which does not run simultaneously under the condition that the power plant does not run, and the maximum load of different running periods is only required to be calculated when the capacity of the emergency diesel generator is calculated.
5. The design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant according to claim 3, wherein in the step (2), for the nuclear safety equipment to support the system-related loads, the emergency diesel generator capacity optimization principle comprises the following steps:
2.1) analyzing the actual load demand of the equipment cooling water under different working conditions, wherein the system and the equipment under the power-off condition do not run any more, and isolating the unnecessary load under the power-off working condition, thereby effectively reducing the actual running power of the equipment cooling pump and reducing the calculated power of the equipment cooling pump in the emergency diesel generator;
2.2) for the ventilation system keeping the ambient temperature, the cooling fan and the electric heater device of the ventilation system are not used simultaneously, and only the maximum load of the cooling fan and the electric heater device is calculated during the calculation of the capacity of the emergency diesel generator; the summer load can be calculated when the power plant with larger ventilation load in summer is proved;
2.3) the loads of the instrument control system are supplied with power by two paths of distribution boards supplied with power by emergency diesel generators, the two paths of power supplies are in redundant configuration, and when the total capacity of the emergency diesel generators is calculated, the load capacity of one path of distribution board can be calculated;
2.4) for supporting cold traps, the spare load can not account for the total capacity;
2.5) calculating the heat dissipation capacity of the equipment after power loss in detail, and taking the heat dissipation capacity of the actual operation load after power loss as the basis of the capacity calculation of the ventilation equipment to avoid calculating the heat dissipation capacity of the equipment in normal operation;
2.6) for a large number of intermittently operating loads, such as boron tracing systems, the power calculation of the plant is optimally calculated according to the run/shut down time ratio of the plant under adverse conditions.
6. The design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant according to claim 3, wherein in the step (2), for the loads including the non-safety level defense function of the nuclear auxiliary system, the emergency diesel generator capacity optimization principle comprises the following steps:
3.1) for loads only used for design expansion conditions due to non-loss of off-plant electricity, although also powered by emergency diesel generators, the load can be calculated as 0 regardless of the application under the loss of off-plant electricity.
7. The design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant according to claim 3, wherein in the step (2), for the industrial security equipment, the emergency diesel generator capacity optimization principle comprises the following steps:
4.1) for the out-of-plant electricity + safety injection working condition or the out-of-plant electricity + safety injection working condition, the loading load should guarantee nuclear safety and personnel safety, and guarantee the minimum configuration of major equipment safety, and the redundant configuration for equipment protection is not loaded on the emergency diesel generator any more.
8. The design method for optimizing the capacity of the emergency diesel generator of the water reactor nuclear power plant according to claim 1 or 2, wherein the principle of optimally configuring 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 requirement on the starting time of the equipment in accident analysis and meets the minimum time requirement of an accident development sequence;
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 required to be loaded in a loading program of 0 s;
5.3) the loading step delay of the support system such as ventilation and cold sources needs to meet the thermal inertia and urgency requirements of the environment or the system, and the time for delaying loading can be determined according to the environment requirements;
5.4) for security loads, the loading time needs to be set based on the use requirement of the equipment, and the time requirement for ensuring the safety of important equipment or personnel safety needs to be met;
5.5) the direct current and uninterrupted power system is provided with a storage battery, and the delayed loading can be realized due to the arrangement of the storage battery;
5.6) for a partial load with a small capacity, in which a control logic function is not necessarily provided, it is considered to load at 0s in order to avoid an increase in a large amount of control logic.
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