CN110069824A - A kind of analysis method of interior of building water logging - Google Patents
A kind of analysis method of interior of building water logging Download PDFInfo
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Abstract
The present invention provides a kind of interior of building flooding analysis methods, this method mainly analyzes interior of building water logging by determining opinion, the stretch analysis method etc. in path of the analysis of safeguard inventory, the division of water logging subregion, the selection in water logging source, water logging source is provided and analyzed, ultimately form the hazard assessment of water logging inside nuclear island, necessary safeguard procedures are taken in conjunction with the hazard assessment, to guarantee that interior of building facility will not cause to endanger because of internal water logging.The present invention is using the water level analysis for determining opinion, the time is not intervened in strict accordance with 30 minutes personnel, the specific data on flows at water source, location information are all calculated analytically and are obtained, more meets actual water level information to obtain, the safety of protection and power station to equipment is of great significance.
Description
Technical field
The invention belongs to nuclear island building of nuclear power plant designing technique, specially a kind of building carried out for nuclear island factory building
Internal water logging analysis method.
Background technique
Regulation flies when strong in " protection of missile and its quadratic effect inside HAD102/04 Section 4 nuclear power station "
When the pipeline, sink and pond that are generally equipped with liquid may be hit by penetrating object, then it must evaluate water logging and cause the potentially possible of damage
Property.Because water logging internal caused by external water logging also results in the attention of State Bureau of Nuclear Safety and industry specialists in Fukushima event.
By taking China at present in-service M310 main force heap-type as an example, though internal water logging protection design from determine the angle of opinion into
It has gone analysis, but several key technologies in analysis method is not made with quantitative analysis and conclusion.It is internal to meet
Flood preventing design that higher requirement and above-mentioned nuclear safety office propose in the requirement building nuclear power plant and improving, need to comb
The link of interior of building flooding analysis is managed, and strictly regulates the analysis method of links in analytic process, is inside nuclear island
The analysis and research of water logging provide theoretical foundation and guarantee.
Chinese patent application 201611144681.4 discloses the water logging subregion dividing system and method for a kind of nuclear power plant, should
Method tentatively carries out the division of water logging subregion to the region according to water logging source in nuclear power plant region and important equipment distribution situation,
Then the water logging water level in each water logging subregion is calculated, the influence according to water logging water level to the important equipment in corresponding subregion,
Determine existing subregion or optimize and revise water logging subregion, be effectively isolated execute the different safety series of same security function equipment and
Component avoids the different series equipment for causing to execute some security function with a water logging from generating common mode failure.This method is to water
The division for flooding subregion is divided according to civil engineering structure, room layout, the system arrangement of nuclear island factory building, the calculating of water logging water level
Drain discharge only is subtracted according to water logging total flow, then divided by the method for net floor area, cannot achieve inside nuclear island factory building
The simulation and analysis of watering-out process, the calculating of water logging water level are also inaccurate, it is difficult to which nuclear island inside water logging is true after reflection accident
Truth condition.
Summary of the invention
It is an object of the invention in view of the drawbacks of the prior art, provide a kind of comprehensively complete interior of building water logging point
Analysis method, each step for internal water logging analytic process provide sturdy theoretical foundation, guarantee the reasonability of entire analysis method.
Technical scheme is as follows: a kind of interior of building flooding analysis method includes the following steps:
(S1) by analyzing each safety-related system and equipment, determination needs safeguard inventory；
(S2) each workshop of interior of building is combined with fire compartment, radiation subregion, divides reasonable water logging subregion, point
Independent flooding analysis is carried out in area；
(S3) rationally representational water logging source is chosen in each water logging subregion；
(S4) flow in representative water logging source is determined；
(S5) modeling of hydrodynamic force mathematical model is carried out based on SPH method, and by physical test model to hydrodynamic force number
It learns model and carries out calibration and verifying, obtain the real time data of hydrophobic process of stretching；
(S6) the analysis result of step (S1) and step (S5) is combined to obtain flooding analysis report, to the need for having water logging danger
Safeguard takes necessary safeguard procedures.
Further, interior of building flooding analysis method as described above is wanted according to the safety of nuclear power station in step (S1)
The screening for carrying out safeguard is asked, is decomposed by the final security target of research object, and analyzed one by one following, most
Determination needs safeguard inventory eventually.
A) according to the condition of the release that meet coolant in the function of system and main pump sealing injection, determine that protection is set
It is standby；
B) ensure the equipment comprising breakdown, boronation and the cold conditions of reactor and the Residual heat removal function in hot stage
Normal operation；
C) determine that the ventilating system under accident and the equipment under engineered safeguard system operate normally；
D) ensure that master control room room and its ambient enviroment keep forbidding water logging state in flooding analysis.
Further, interior of building flooding analysis method as described above, the specific division of water logging subregion in step (S2)
Method is as follows:
Communicating position between the workshop of nuclear island is provided with fire prevention or waterproof sealing door, and the water source between workshop will not
The workshop, is divided into preliminary water logging partition analysis range by circulation mutually；If without this setting between workshop, by interface channel
It is divided into preliminary water logging partition analysis range as a whole with workshop；
Secondly, be internally provided with fire compartment in workshop, the communicating position of hole, door within the scope of fire compartment and other
Fire compartment is provided with fireproof blocking, fire resistant doorsets, half gas-tight door, these fireproof blockings, fire resistant doorsets and half gas-tight door can hold
By certain atmospheric pressure, have the function of stopping water source, then each fire compartment is equivalent to a confined space, this is prevented
Fiery subregion is analyzed as independent water logging subregion；
If being related to radiating subregion in fire compartment, a compartment inside aperture, sleeve have biological protection to block, water source
It will not flow out, can be analyzed using a compartment or several boothes as independent water logging subregion within the flooding analysis time limit.
Further, interior of building flooding analysis method as described above, according to piping failure, fire water in step (S3)
Spray and water tank failure conditions choose rationally representational water logging source；Multiple water logging sources all exist in single water logging subregion
When, take most dangerous water logging source as analysis site, to ensure that the water level in water logging subregion is peak level.
Further, interior of building flooding analysis method as described above, water logging subregion interior conduit cut in step (S4)
The calculation formula of flow is flowed out are as follows:
In formula, qvFor cut flow,
CqFor discharge coefficient,
A is cut circulation area,
Δ P is pressure difference,
ρ is fluid density.
Water source discharge is handled by following situation in independent water logging subregion:
1) the hydrophobic facility in ground is handled according to blocking, discharge 0；
2) other door openings, ground hole etc., what is do not blocked is handled according to hole leakage flow；Blocked according to step
Suddenly the water logging partition method of (S2) is divided, and determines the discharge of water logging subregion.
Further, the physical simulation method of interior of building flooding analysis method as described above, step (S5) is as follows:
(S5-1) carry out physical test according to simulated conditions, the verifying foundation as mathematical modeling results；
(S5-2) according to building relevant information and water logging source information, hydrodynamic force mathematical model is carried out based on SPH method
Modeling；
(S5-3) according to the test result of physical test model, calibration and verifying are carried out to hydrodynamic force mathematical model；
(S5-4) carry out water logging event simulation according to calculating requirement using the hydrodynamic force mathematical model by verifying to calculate；
(S5-5) water level in watering-out process is provided according to simulation calculated result quantization to change with time process, and make three
Tie up dynamic demonstration.
Further, in the step of above-mentioned interior of building water logging analogy method (S5-1), the model of physical test be according to
According to fabric structure feature and internal water logging source flux and location information, it is designed by gravity similarity criterion, is tied in conjunction with test
Structure scale and equipment performance determine model length than ruler, and setting meets the flow of experimental condition, roughness carries out waterflooding test.
Further, soft using DualSPHysics in the step of above-mentioned interior of building water logging analogy method (S5-2)
The modeling of part progress hydrodynamic force mathematical model；
Using workshop and relevant pedestal, device structure as the boundary model Gu Bi, fluid particles in consideration workshop in calculating,
Particles Moving is controlled by continuity equation, the equation of momentum and state equation, and in cartesian coordinate system, governing equation is as follows:
Wherein: t is the time；V is fluid velocity；ρ is fluid density；ρOFor reference density；M is fluid mass；P is pressure
Power；Π is viscosity term；W is kernel function；G is acceleration of gravity；C0For the velocity of sound under reference density；γ is constant coefficient；Subscript i table
Show that i-th of particle, subscript j indicate j-th of particle within the scope of i particle scope；Subscript ij indicates that i-th of particle functions
Interaction relationship in range between j-th of particle；Subscript 0 is constant footmark.
Further, in the step of above-mentioned interior of building water logging analogy method (S5-3), to physical experiments result
It is arranged with hydrodynamic force mathematical model calculated result, the water body both compared is stretched state and height of water level data, is gone forward side by side
The adjustment of row mathematical model parameter is finally reached the almost the same situation of the two waterflooding effect.
Further, in the step of above-mentioned interior of building water logging analogy method (S5-4), the water logging event simulation meter
It is completed on the computer for being equipped with profession GPU scientific calculation acceleration equipment using concurrent technique at last.
Further, in the step of above-mentioned interior of building water logging analogy method (S5-5), pass through extraction
The calculated result file of DualSPHysics software quantifies water level in watering-out process and changes with time process, obtains room water
Flood height, the time-history curves of water logging height and water body are stretched path.
Further, interior of building flooding analysis method as described above by mathematical modeling results and needs in step (S6)
Safeguard inventory combines, and judges influence of the water logging height to safeguard in flooding analysis cell, for recognizing without situation is influenced
For the water logging working condition safety；If water logging height exceeds and needs safeguard allowed band, i.e., need to take safeguard procedures appropriate with
Guarantee that main security function is not lost.
Beneficial effects of the present invention are as follows: the present invention from the analysis of safeguard, the division of water logging subregion, water logging source sieve
The stretch analysis various aspects in path of choosing method, water logging source have carried out detailed analysis, it is ensured that flooding analysis inside nuclear island factory building
The integrality and reasonability of method.Wherein using the water level analysis for determining opinion, the time is not intervened in strict accordance with 30 minutes personnel, it is right
Specific flow, the location information at water source are all calculated analytically, and are more met actual water level information to obtain, are prevented equipment
Shield and the safety in power station are of great significance.The present invention ultimately forms the hazard assessment of water logging inside nuclear island, comments in conjunction with the harm
Valence takes necessary safeguard procedures, and then ensures that nuclear island safety-related system, equipment and relevant facility will not be because of inside
Water logging and the function of influencing safe shutdown reduce the harm of internal water logging event.
Detailed description of the invention
Fig. 1 is interior of building flooding analysis method flow diagram provided by the present invention；
Fig. 2 is the method flow diagram established hydrodynamic force mathematical model the present invention is based on SPH method and carry out water logging simulation；
Fig. 3 is that the water flow of water logging analog physical test model in the present invention controls the basic composition schematic diagram of equipment；
Fig. 4 is the comparison schematic diagram of the SEA LEVEL VARIATION course result of a certain characteristic point in water logging simulation test of the present invention.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
The present invention provides a kind of analysis methods of water logging inside complete nuclear island factory building.The analysis method is from safeguard
Analysis, the stretch analysis etc. in path of the division of water logging subregion, the screening technique in water logging source, water logging source analyzed, be
Each step of internal water logging analytic process provides sturdy theoretical foundation, ensure that the reasonability of entire analysis method.
As shown in Figure 1, a kind of interior of building flooding analysis method, includes the following steps:
(S1) by analyzing each safety-related system and equipment, determination needs safeguard inventory；
(S2) each workshop of interior of building is combined with fire compartment, radiation subregion, divides reasonable water logging subregion, point
Independent flooding analysis is carried out in area；
(S3) in each water logging subregion, according to piping failure, fire-fighting water spray and water tank failure conditions, choosing rationally has generation
The water logging source of table；
(S4) flow in representative water logging source is determined；
(S5) modeling of hydrodynamic force mathematical model is carried out based on SPH method, and by physical test model to hydrodynamic force number
It learns model and carries out calibration and verifying, obtain the real time data of hydrophobic process of stretching；
(S6) the analysis result of step (S1) and step (S5) is combined to obtain flooding analysis report, to the need for having water logging danger
Safeguard takes necessary safeguard procedures.
Various method steps are specifically described below.
1. the analysis of safeguard inventory
Firstly, flooding analysis must inside nuclear island to guarantee that main security function is not lost when water logging occurs for nuclear island factory building
It must include all equipment for needing to be implemented security function.In internal flooding analysis, if safety-related systems, structures and portion
Part does not have safe shutdown function or when their fail safe shutdown functions has been completed, their failure is acceptable.
The screening for carrying out safeguard according to the safety requirements of nuclear power station is first had in flooding analysis, is related to leading among these
The large number of equipment of the systems such as circuit system, each auxiliary system and electrical instrument control.
It is decomposed by the final security target of research object, is analyzed following one by one:
A) according to the condition of the release that meet coolant in the function of system and main pump sealing injection, determine that protection is set
It is standby.
B) ensure setting for the functions such as breakdown, boronation and cold conditions and the Residual heat removal in hot stage comprising reactor
Standby normal operation.
C) determine that the ventilating system under accident and the equipment under engineered safeguard system operate normally.
D) ensure that master control room room and its ambient enviroment keep forbidding water logging state in flooding analysis.
Final determination needs safeguard inventory.
2. the division of water logging subregion
The division rule of water logging subregion, the communicating position between each workshop of nuclear island are all provided with fire prevention or waterproof
Hermatic door, the water source between workshop will not circulate mutually, so analyst coverage is contracted in a certain workshop first, if workshop it
Between without this setting, then need as a whole to analyze interface channel and workshop；Secondly, being internally provided with fire prevention point in workshop
Area, the communicating positions such as hole, door within the scope of fire compartment and other fire compartments are provided with fireproof blocking, fire resistant doorsets, half gas
Mi Men etc., these fireproof blockings, fire resistant doorsets and half gas-tight door are able to bear certain atmospheric pressure, have the work for stopping water source
With therefore, each fire prevention cell is equivalent to a confined space, can be contracted to analyst coverage in a certain fire compartment；Portion
Divide and be related to radiation subregion variation in fire compartment, it is also necessary to there is radiation shield to block and require, biological protection shields closure pair
Gamma-ray shielding action is suitable with the concrete of condition of equivalent thickness, so compartment inside aperture, sleeve have biological protection to block, water
Source will not flow out within the flooding analysis time limit, analyst coverage further can be contracted to a certain compartment or several boothes accordingly
It is interior.
3. the screening in water logging source
The screening in further progress water logging source after analyst coverage determines.For in single anti-flooding subregion equipment, pipeline,
Fire-fighting, bellows etc. are potentially screened, and are carried out by the following method:
Equipment: generating leakage to active components such as pump, valves or water logging caused by leakage-preventing sealing device fails, can be to setting
Standby caused leakage is compared with the rupture of this water logging subregion interior conduit or cut water logging source, chooses maximum value.
Water tank: it assume that the antidetonation I class water tank with redundancy vacuum demolition set or atmosphere opening and overpressure protection
Failure.For the antidetonation I class water tank and all non-antidetonation I class water tanks without these facilities, should be evaluated with regard to swamping effect.
Bellows: bellows and expansion joint to circulation should carry out special evaluation and answer vacation when being evaluated
If each bellows and expansion joint are entirely ineffective, pipeline breaking mode where being equal to.
Fire-fighting spraying: being considered as the influence of all fire-fighting system movements in region to the water logging that fire-fighting system trigger generates,
The total flow of sprinkling is calculated according to RCC-I and 22158 design specification related request of GB/T: 10~15L/ (min* ㎡) * time
(30 minutes) * area (room), and it is superimposed the total volume of fire hydrant.Spraying intensity is determined according to equipment difference.
Container spray: container spray water and built-in material-changing water tank (IRWST) form circulating cooling, in plant designing not
Delay of the meeting to a large amount of water are caused in cell.It can not be made a concrete analysis of in water source.
High energy pipeline: high energy pipeline has two kinds of forms of cut and rupture, but the water for rupturing generation is far longer than leakage and splits
The water that seam or wall-through crack generate, to choose the principle at maximum water source, high energy pipeline only analyzes water caused by breaking point position
Flood source.Circumferential rupture and longitudinal break occur for all hypothesis of high energy pipeline, but the two does not occur simultaneously, therefore with worst case both-end
It is analyzed based on fracture.First using the water under high energy pipeline breaking as water logging source；Secondly it is obtained according to mechanical analysis
Several breakdown points, choose and maximum breakdown point endangered as water source point to safeguard in room.
Middle energy pipeline: middle energy piping failure position only assumes that wall-through crack, no circumferential or longitudinal break possibility occurs.Ginseng
The cut point that mechanical analysis obtains is examined, chooses and maximum cut point is endangered as water source analysis point to safeguard in room.In
Energy pipeline cut is a circular aperture for penetrating tube wall, and sectional flow area is equal to the half and pipe thickness of the internal diameter of pipeline
Half product, i.e. sectional flow area are as follows: 1/2t*1/2D, t indicate that pipeline wall thickness, D indicate internal diameter.
The non-antidetonation pipeline of non-core: to the pipeline without aseismic analysis, break location be likely to occur in each pipe fitting and
At welded attachment, worst position is as water source point in same selection room.
In single anti-flooding subregion, source item mentioned above all in the presence of, take most dangerous water source as analysis site, this
Sample ensures that the water level in cell is peak level.
4. determining the flow in representativeness water logging source
Cut, which goes out to flow flow to adopt, to be formulated as:
In formula, qvCut flow
CqDischarge coefficient
A- cut circulation area
Δ P- pressure difference
ρ-fluid density
Based on the above analysis, the water source influx in anti-flooding subregion is it has been determined that the analysis processing of discharge is as follows:
1) the hydrophobic facility in ground is handled according to blocking, discharge 0；
2) other door openings, ground hole etc., what is do not blocked is handled according to hole leakage flow.Blocked according to step
Suddenly the water logging partition method of (S2) is divided, and determines the discharge of water logging subregion.
5. water logging physical test and the simulation of hydrodynamic force mathematical model
According to above-mentioned input condition, further by establishing three-dimensional mathematical model, with the imaginary internal water of computer simulation
Event is flooded, the waterflooding height of water level after obtaining stable state, moreover it is possible to obtain the peak level of transient state and the highest reached on water logging path
The time of water level.Or it is directed to a certain simple analytical unit, the road of stretching for obtaining water logging can be also analyzed rapidly by manually calculating
Diameter and water level.
5.1) physical experiments:
For the reliability for determining mathematical model calculated result, carry out physical experiments, help adjusts model parameter, including
The data such as the size and time step of particle.Pass through analysis mill construction feature (including fabric structure, door type, threshold, hole
Hole, stair etc.) and internal water logging source flux and location information (including uninterrupted, water (flow) direction), it is set by gravity similarity criterion
Physical experiments are counted, equal proportion establishes the structural model of nuclear island factory building, in conjunction with factors such as test structure scale and equipment performances
Model length is determined than ruler, make model and carries out test, using Dynamic High-accuracy water level monitoring equipment in the water logging time not
It is measured with SEA LEVEL VARIATION at position.
Establishing physical experiments mainly includes: workshop modelling, water flow control equipment installation and debugging, water level are surveyed
Workshop inside water logging simulation test, test data finishing analysis under different operating conditions are simulated in amount instrument and data acquisition software installation.
Can select high transparency, high rigidity organic glass as modeling material, guarantee that model dimension and prototype are several
What is similar.Carrying out test to need the instrument and equipment used includes that water flow controls equipment and water level measure system by ultrasonic wave, can
With water level changing course curve in dynamic one-point measurement watering-out process.By determining test flow, according to traffic requirement, customization is high
Precision constant water flow-control equipment, water flow control the basic composition of equipment as shown in figure 3, including reservoir 1, water pump 2, electricity
Magnetic flowmeter 5, pressure gauge 3, regulating valve 4, rubber hose 6, expanding/undergauge short tube 7 pass through the number of ultrasonic water level probe acquisition
According to and the image of camera record extract, analyze the reasonability of test data.
In triplicate for every group of operating condition of test, specific test procedure is as follows:
1. debugging water system, reaches leakage point water outlet and require；
2. setting up pipeline according to leakage point position；
3. adjusting level measuring probe in the room of water logging predominating path；
4. water level measurement system Zero calibration；
5. setting up photographic device, content of shooting is determined；
6. starting to test, SEA LEVEL VARIATION in not chummery, maximum water logging height, water logging path are recorded；
7. emptying water body in model, cleaning, drying model repeat to test.
The image of off-test, data and camera record to ultrasonic water level probe acquisition extracts and analyzes examination
The water level course of changing with time is depicted as curve by the reasonability for testing data, the foundation as mathematical model verifying.
5.2) modeling of hydrodynamic force mathematical model:
(1) mathematical model is established:
According to the relevant informations such as the fabric structure of nuclear island factory building, door type, threshold, hole, stair and water logging source
Uninterrupted and water (flow) direction carry out hydrodynamic(al) force modeling using the DualSPHysics software based on SPH method,
DualSPHysics software is a open source software based on smoothed particle method (SPH) model.
Using workshop and relevant pedestal, device structure etc. as the boundary model Gu Bi, fluid grain in consideration workshop in calculating
Son, Particles Moving are controlled by continuity equation, the equation of momentum and state equation, in cartesian coordinate system, governing equation description
It is as follows:
Wherein: t is the time；V is fluid velocity；ρ is fluid density；ρ0For reference density；M is fluid mass；P is pressure
Power；Π is viscosity term；W is kernel function；G is acceleration of gravity；C0For the velocity of sound under reference density；γ is constant coefficient；Subscript i table
Show that i-th of particle, subscript j indicate j-th of particle within the scope of i particle scope；Subscript ij indicates that i-th of particle functions
Interaction relationship in range between j-th of particle；Subscript 0 is constant footmark.
(2) parameter setting:
Kernel form in Quintic is selected, corresponding smooth scale is selected as 0.866；Select Symplectic time integral lattice
Formula, in order to improve computational efficiency using variable time step method, corresponding maximum Krona number is set as 0.3；Sticky processing mode is adopted
With common pseudo-viscosity mode, viscosity is set as 0.01；Acceleration of gravity is set as 9.81m/s2；The setting of water body density
For 1000kg/s3；Constant coefficient γ is set as 7 in state equation；Increase diffusion term using Delta-SPH formula and reduces density wave
Dynamic, Delta-SPH coefficient is set as 0.1；Particle is arranged using the mode of interlocking in the boundary Gu Bi.
5.3) calibration and verifying are carried out to hydrodynamic force mathematical model
The selection of particle size, time step and model parameter is directly related to computational accuracy, effect in mathematical model calculating
The authenticity of rate and fluidised form.Time step and particle size setting are excessive, and number of particles is less, but computational solution precision is low,
It directly results in height of water level result and actual conditions is not inconsistent；Time step and particle size setting are too small, make to calculate required particle
Quantity is extremely huge, the ability of the far super active computer of calculated load.According to physical experiments result to above-mentioned mathematical model
Parameter be adjusted, it can be ensured that the later period carry out the workshop water logging time serial mathematical simulation when, can be at a reasonable time
The result for meeting required precision is obtained in range and under both economical calculating consuming.To physical experiments result and mathematical modulo
Type calculated result is arranged, and stretch state and the height of water level data of water body are compared, and carries out the tune of mathematical model parameter
It is whole, it is finally reached the almost the same situation of the two waterflooding effect.Fig. 4 is the SEA LEVEL VARIATION course result of a certain characteristic point in test
Compare.
5.4) it is required to carry out the calculating of water logging event simulation according to calculating:
After model is built up, completed on the computer for being equipped with profession GPU scientific calculation acceleration equipment (2880 cores).
DualSPHysics software solver uses advanced, mature SPH algorithm, supports central processing unit (CPU) or graphics processor
(GPU) parallel computation especially uses the concurrent technique based on GPU, realizes the efficient flow field simulation of up to ten million scale particles, full
To the requirement of computational accuracy and efficiency in sufficient Practical Project.
5.5) post-processing of calculated result:
(1) data processing
By existing technological means secondary development data extraction program, this is for those skilled in the art can
With what is voluntarily realized, the calculated result file of DualSPHysics is read with the data extraction program developed, quantifies water logging
The water level of journey changes with time process, obtains room water logging height, the time-history curves of water logging height and water body sprawling path.
(2) three-dimension animation
The calculated result of DualSPHysics can be directly read out with ParaView and be fabricated to three-dimensional demonstration animation.
, can be in directly monitoring water logging generating process by the three-dimensional demonstration animation being fabricated to, structures flood situation in building,
The analysis and research of nuclear island inside water logging are provided an important basis.
6. inside water logging hazard assessment
Mathematical modeling results and safeguard inventory are combined, judge that water logging height is to safeguard in flooding analysis cell
Influence, for without influence situation, it is believed that the water logging working condition safety；If water logging height, which exceeds, needs safeguard allowed band,
Safeguard procedures appropriate need to be taken to guarantee that main security function is not lost.
In conclusion the present invention is from the determination of safeguard, the division of water logging subregion, the screening technique in water logging source, water logging
Source path various aspects of stretching have carried out detailed analysis, above method collective effect, it is ensured that the analysis method of internal water logging
Integrality and reasonability.Wherein using the water level analysis for determining opinion, the time is not intervened in strict accordance with 30 minutes personnel, to water source
Specific data, location information are all calculated analytically, and more meet actual water level information to obtain, protection and electricity to equipment
The safety stood is of great significance.The present invention ultimately forms the hazard assessment of water logging inside nuclear island, takes in conjunction with the hazard assessment
Necessary safeguard procedures, so ensure safety-related system, equipment and the relevant facility of nuclear island will not because of internal water logging and
It influences the function of safe shutdown or reduces the harm of internal water logging event.
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.If in this way, belonging to the model of the claims in the present invention and its equivalent technology to these modifications and changes of the present invention
Within enclosing, then the present invention is also intended to include these modifications and variations.
Claims (14)
1. a kind of interior of building flooding analysis method, includes the following steps:
(S1) by analyzing each safety-related system and equipment, determination needs safeguard inventory；
(S2) each workshop of interior of building is combined with fire compartment, radiation subregion, reasonable water logging subregion is divided, in subregion
Carry out independent flooding analysis；
(S3) rationally representational water logging source is chosen in each water logging subregion；
(S4) flow in representative water logging source is determined；
(S5) modeling of hydrodynamic force mathematical model is carried out based on SPH method, and by physical test model to hydrodynamic force mathematical modulo
Type carries out calibration and verifying, obtains the real time data of hydrophobic process of stretching；
(S6) the analysis result of step (S1) and step (S5) is combined to obtain flooding analysis report, to there is water logging danger to need to protect
Equipment takes necessary safeguard procedures.
2. interior of building flooding analysis method as described in claim 1, it is characterised in that: according to nuclear power station in step (S1)
Safety requirements carry out safeguard screening, decomposed by the final security target of research object, and to it is following one by one into
Row analysis, final determination need safeguard inventory；
A) according to the condition of the release that meet coolant in the function of system and main pump sealing injection, safeguard is determined；
B) ensure the equipment operation of breakdown, boronation and cold conditions comprising reactor and the Residual heat removal function in hot stage
Normally；
C) determine that the ventilating system under accident and the equipment under engineered safeguard system operate normally；
D) ensure that master control room room and its ambient enviroment keep forbidding water logging state in flooding analysis.
3. interior of building flooding analysis method as described in claim 1, it is characterised in that: water logging subregion in step (S2)
Specific division methods are as follows:
Communicating position between the workshop of nuclear island is provided with fire prevention or waterproof sealing door, and the water source between workshop will not be mutual
The workshop, is divided into preliminary water logging partition analysis range by circulation；If without this setting between workshop, by interface channel and factory
Room is divided into preliminary water logging partition analysis range as a whole；
Secondly, it is internally provided with fire compartment in workshop, the communicating position of hole, door within the scope of fire compartment and other fire prevention
Subregion is provided with fireproof blocking, fire resistant doorsets, half gas-tight door, these fireproof blockings, fire resistant doorsets and half gas-tight door be able to bear one
Fixed atmospheric pressure has the function of blocking water source, then each fire compartment is equivalent to a confined space, by the fire prevention point
It is analyzed as independent water logging subregion in area；
If being related to radiating subregion in fire compartment, a compartment inside aperture, sleeve have biological protection to block, and water source is in water
Flooding in the analysis time limit will not flow out, and can analyze using a compartment or several boothes as independent water logging subregion.
4. interior of building flooding analysis method as described in claim 1, it is characterised in that: broken according to pipeline in step (S3)
Damage, fire-fighting water spray and water tank failure conditions choose rationally representational water logging source；Multiple water loggings in single water logging subregion
Source all in the presence of, take most dangerous water logging source as analysis site, to ensure that the water level in water logging subregion is peak level.
5. interior of building flooding analysis method as described in claim 1 or 4, it is characterised in that: building as described above
Internal water logging analysis method, water logging subregion interior conduit cut goes out to flow the calculation formula of flow in step (S4) are as follows:
In formula, qvFor cut flow,
CqFor discharge coefficient,
A is cut circulation area,
Δ P is pressure difference,
ρ is fluid density.
6. interior of building flooding analysis method as claimed in claim 5, it is characterised in that: independent water logging in step (S4)
Water source discharge is handled by following situation in subregion:
1) the hydrophobic facility in ground is handled according to blocking, discharge 0；
2) other such as door openings, ground hole, what is do not blocked is handled according to hole leakage flow；Blocked according to step (S2)
Water logging partition method divided, determine the discharge of water logging subregion.
7. interior of building flooding analysis method as described in claim 1, it is characterised in that: the physical simulation side of step (S5)
Method is as follows:
(S5-1) carry out physical test according to simulated conditions, the verifying foundation as mathematical modeling results；
(S5-2) according to building relevant information and water logging source information, building for hydrodynamic force mathematical model is carried out based on SPH method
Mould；
(S5-3) according to the test result of physical test model, calibration and verifying are carried out to hydrodynamic force mathematical model；
(S5-4) carry out water logging event simulation according to calculating requirement using the hydrodynamic force mathematical model by verifying to calculate；
(S5-5) water level in watering-out process is provided according to simulation calculated result quantization to change with time process, and make three-dimensional dynamic
State demonstration.
8. interior of building flooding analysis method as claimed in claim 7, it is characterised in that: physical test in step (S5-1)
Model be to be designed according to fabric structure feature and internal water logging source flux and location information by gravity similarity criterion,
Model length is determined than ruler in conjunction with test structure scale and equipment performance, and setting meets the flow of experimental condition, roughness carries out
Waterflooding test.
9. interior of building flooding analysis method as claimed in claim 7, it is characterised in that: used in step (S5-2)
The modeling of DualSPHysics software progress hydrodynamic force mathematical model.
10. the interior of building flooding analysis method as described in claim 7 or 9, it is characterised in that: with factory in step (S5-2)
Room and relevant pedestal, device structure are as the boundary model Gu Bi, and fluid particles in consideration workshop in calculating, Particles Moving is by even
Continuous property equation, the equation of momentum and state equation control, in cartesian coordinate system, governing equation is as follows:
Wherein: t is the time；V is fluid velocity；ρ is fluid density；ρ0For reference density；M is fluid mass；P is pressure；Π is
Viscosity term；W is kernel function；G is acceleration of gravity；C0For the velocity of sound under reference density；γ is constant coefficient；Subscript i is indicated i-th
Particle, subscript j indicate j-th of particle within the scope of i particle scope；Subscript ij indicates that i-th of particle functions in range
Interaction relationship between j-th of particle；Subscript O is constant footmark.
11. interior of building flooding analysis method as claimed in claim 7, it is characterised in that: to physics in step (S5-3)
Model test result and hydrodynamic force mathematical model calculated result are arranged, the water body both compared stretch state and water level it is high
Degree evidence, and the adjustment of mathematical model parameter is carried out, it is finally reached the almost the same situation of the two waterflooding effect.
12. interior of building flooding analysis method as claimed in claim 7, it is characterised in that: water described in step (S5-4)
Flooding event simulation and calculating is to be completed on the computer for being equipped with profession GPU scientific calculation acceleration equipment using concurrent technique.
13. interior of building flooding analysis method as claimed in claim 7, it is characterised in that: by mentioning in step (S5-5)
It takes the calculated result file of DualSPHysics software, quantifies water level in watering-out process and change with time process, obtain room
Water logging height, the time-history curves of water logging height and water body are stretched path.
14. interior of building flooding analysis method as described in claim 1, it is characterised in that: by mathematical modulo in step (S6)
Intend result and safeguard inventory is needed to combine, influence of the water logging height to safeguard in flooding analysis cell is judged, for nothing
Influence situation, it is believed that the water logging working condition safety；If water logging height, which exceeds, needs safeguard allowed band, i.e., need to take appropriate
Safeguard procedures are to guarantee that main security function is not lost.
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| CN112053047A (en) * | 2020-08-25 | 2020-12-08 | 上海核工程研究设计院有限公司 | Probability evaluation method for flooding caused by manual operation of power plant |
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