CN109948296A - Fusant is cooling in a kind of lower head is detained efficiency evaluation method - Google Patents
Fusant is cooling in a kind of lower head is detained efficiency evaluation method Download PDFInfo
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- CN109948296A CN109948296A CN201910280762.4A CN201910280762A CN109948296A CN 109948296 A CN109948296 A CN 109948296A CN 201910280762 A CN201910280762 A CN 201910280762A CN 109948296 A CN109948296 A CN 109948296A
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Abstract
The invention discloses a kind of cooling delay efficiency evaluation methods of fusant in lower head: determining the probability density distribution of fusion pool original state parameter and key parameter；Select the cooling delay efficiency evaluation method of fusant in lower head；Select lower head fusion pool layered structure and lower head geometry；Select lower head fusion pool water layer air gap heat transfer model；Determine fusion pool configuration state；Heat flow density of the calculating fusant to lower head；The heat flow density of fusant to lower head is compared with the critical heat flux density of lower head outside wall surface, obtains the cooling delay efficiency evaluation result of fusant in lower head based on comparative result；Consider the effect that the compatibility between fusant composition is layered fusion pool, fusion pool layered structure is judged according to the composition parameters of fusant original state, the formation probability and the cooling probability density distribution for being detained validity of fusant for calculating two layers or three layers melting pool structure, realize the ROAAM method evaluation of three layers of melting pool structure.
Description
Technical field
The present invention relates to a kind of nuclear reactor severe accident relieving measure efficiency evaluation methods, and in particular to, reactor
When major accident reactor core fusant is moved in lower head, cooling provision and pressure vessel outside Reactor cavity flooding pressure vessel are taken
Fusant is cooling after interior water filling cooling provision, in a kind of lower head is detained efficiency evaluation method.
Background technique
At present in advanced third generation reactor design both at home and abroad, for alleviate major accident realize reactor core fusant it is cooling and
There are mainly two types of the strategies of delay: 1, cooling in fusant heap and delay (In-Vessel Retention, IVR)；2, fusant
Out-pile is cooling and is detained.The application of the first strategy is using AP600/AP1000 as representative.Second of strategy needs to be arranged special
Fusant trap accepts reactor core fusant, and fusant is cooling and be trapped in inside trap.
In the application of the first strategy, by taking AP600/AP1000 as an example, the major accident of core meltdown occurs for reactor
Afterwards, reactor core fusant, which inevitably migrates, resets positioned at lower head of pressure vessel, floods heap by Reactor cavity flooding cooling system
Chamber, cooled reactor lower head of pressure vessel outer surface realize that fusant is detained in lower head of pressure vessel, maintains pressure vessel
Integrality.
When fusant is detained efficiency evaluation in lower head of pressure vessel, the evaluation method of home and abroad is all base at present
In composition mixing, simply two layers or three layers melting pool structure being layered, metal phase is mutually individually present with oxide, i.e., in two layers of He
In three layers of melting pool structure, top light metal layers composition is Zr and SS, and oxidation pond composition is UO2And ZrO2, bottom heavy metal layer at
Part is U, Zr and SS.
Summary of the invention
Three layers of melting pool structure being layered in the prior art based on composition mixing, simply are also commented without carrying out " probability sampling "
Valence.Based on composition mixing, simply the melting pool structure being layered is also not according to the composition parameters of fusant original state to melting
Pond layered structure is judged, the effect that the compatibility between fusant composition is layered fusion pool is not accounted for yet.State at present
The fusant of interior foreign countries is detained efficiency evaluation method, does not also account for taking the interior lower head after filling the water cooling provision of pressure vessel
The influence cooling to fusant of fusion pool water layer air gap heat transfer model.
Therefore, in order in accurate evaluation lower head of pressure vessel fusant be detained validity, two layers or three layers points of fusion pool
" probability sampling " of the layer judgement of structure and the determination of each layer composition parameters, three layers of melting pool structure is evaluated, in pressure vessel
It fills the water cooling provision and evaluation of effect is detained to fusant, be all a problem to be solved.
This application provides a kind of cooling delay efficiency evaluation methods of fusant in lower head, according to fusant initial shape
The composition parameters of state judge fusion pool layered structure, it is contemplated that the compatibility between fusant composition is layered fusion pool
Effect, and carry out " probability samplings " evaluation of three layers of melting pool structure, additionally it is possible to evaluate and fill the water cooling provision in pressure vessel
To the cooling effect being detained of fusant in lower head.
For achieving the above object, this application provides a kind of cooling delay efficiency evaluation sides of fusant in lower head
Method, which comprises
Step 1: fusion pool original state parameter is determined；
Step 2: fusant is cooling in selection lower head is detained efficiency evaluation method option, comprising:
Option 1: it determines and discusses evaluation method, enter step four；
Option 2: crash analysis method (the Risk-Oriented Accident Analysis based on risk-oriented
Methodology, ROAAM), enter step three；
Step 3: determining the Uncertainty distribution of fusion pool parameter, determines the probability of fusion pool original state key parameter
Density Distribution is sampled key parameter to obtain combining parameter values, enters step four；
Step 4: selection lower head fusion pool layered structure；
Step 5: selection lower head geometry；
Step 6: selection lower head fusion pool water layer air gap heat transfer model；
Step 7: it is passed based on lower head fusion pool layered structure, lower head geometry, lower head fusion pool water layer air gap
Thermal model determines fusion pool configuration state；
Step 8: optimal fusion pool heat transfer relation formula is selected to calculate fusant to lower head according to fusion pool configuration state
Heat flow density；
Step 9: in each angle of lower head, by facing for the heat flow density of fusant to lower head and lower head outside wall surface
Boundary's heat flow density is compared, and obtains the cooling delay efficiency evaluation result of fusant in lower head based on comparative result.
Preferably, fusion pool original state parameter includes: decay heat, UO2Gross mass, stainless steel gross mass, zirconium gross mass,
Zirconium aoxidizes share etc..
Preferably, the crash analysis method based on risk-oriented, fusion pool original state need predetermined probabilities Density Distribution
Key parameter include: decay heat, stainless steel gross mass, zirconium oxidation share, non-zirconium oxide participate in heavy metal layer layering ratio,
Stainless steel participates in the ratio of heavy metal layer layering.
Preferably, lower head fusion pool layered structure option includes:
Option 1: two layers melts pool structure；
Option 2: layered approach is three layers of melting pool structure when replacing top and bottom process (only limit, which determines, discusses evaluation method)；
Option 3: three layers of melting pool structure when layered approach is U-Zr-O-Fe phasor miscibility gap range top and bottom process (only limit
It determines and discusses evaluation method)；
Option 4: when layered approach is displacement top and bottom process, calculating judges to melt pool structure for two layers or three layers；
Option 5: when layered approach is U-Zr-O-Fe phasor miscibility gap range top and bottom process, calculating judgement melting pool structure is
Two layers or three layers.
Preferably, lower head geometry option includes:
Option 1: spherical lower head；
Option 2: elliposoidal lower head；
The option of lower head fusion pool air gap heat transfer model includes:
Option 1: no water layer air gap heat transfer model；
Option 2: there is water layer air gap heat transfer model.
Preferably, after reactor core fusant collapsing moves to lower head, when lower head water dries up, no water layer air gap is selected to pass
Thermal model；When reactor core fusant collapsing starts to move to lower head, water injection method guarantees that fusant top has in pressure vessel
Water injection, selection have water layer air gap heat transfer model.
Preferably, fusion pool configuration state option includes:
(1) two layers of the melting pool structure-spherical shape or elliposoidal lower head of no water layer air gap heat transfer；
(2) the three layers of melting pool structure-spherical shape or elliposoidal lower head of no water layer air gap heat transfer；
(3) two layers of the melting pool structure-spherical shape or elliposoidal lower head for thering is water layer air gap to conduct heat；
(4) the three layers of melting pool structure-spherical shape or elliposoidal lower head for thering is water layer air gap to conduct heat.
Preferably, ratio of the calculating fusant to the heat flow density of lower head and the critical heat flux density of lower head outside wall surface
Value, if less than 1, in lower head, fusant is cooling is detained effectively for ratio, ratio between 0.9 to 1.0, then effective allowance compared with
It is small.
Preferably, the crash analysis method based on risk-oriented, when lower head fusion pool layered structure option is 1, statistics
The probability density distribution of the ratio of the heat flow density and critical heat flux density of two layers melting pool structure, and ratio calculated is less than 1
Effective Probability and ratio are between the smaller i.e. insufficient probability of 0.9 to 1.0 effective allowances.
Preferably, the crash analysis method based on risk-oriented, when lower head fusion pool layered structure option is 4 and 5, first
The formation probability for calculating two layers and three layers melting pool structure, then counts two layers, three layers of melting pool structure and fusion pool respectively
The probability density distribution of the ratio of the heat flow density and critical heat flux density of structure, and Effective Probability of the ratio calculated less than 1, with
And ratio is between 0.9 to 1.0 effective lesser probability of allowance.
Preferably, two layers of melting pool structure is the melting pool structure based on composition mixing, being simply layered, metal phase and oxidation
Object is mutually individually present to form layering.
Preferably, three layers of melting pool structure for replacing top and bottom process are the melting pool structures based on composition mixing, being simply layered,
Light metal phase, oxide phase and huge sum of money symbolic animal of the birth year are individually present to form layering；The formation of bottom heavy metal layer is based on UO2+ Zr=
ZrO2The displacement of+U chemically reacts, and assumes that uranium displacement ratio is related with the initial oxidation share of zirconium in the heavy metal layer of bottom.
Preferably, three layers of melting pool structure of U-Zr-O-Fe phasor miscibility gap range top and bottom process are based on fusant composition
Between compatibility to fusion pool lamination；Sentenced using miscibility gap range in the U-Zr-O-Fe phasor of U/Zr=constant plane
Disconnected fusant layering；If fusant is in miscible range, fusant is uniformly distributed, if fusant is not in miscible model
In enclosing, then it is layered；Using miscibility gap range in U-Zr-O-Fe phasor and equilibrium state line, oxide phase and metal are determined
Then mole share of mutually each composition calculates the density of oxide phase and metal phase；Metal phase is greater than the density of oxide phase
Density forms three layers of melting pool structure of top light metal layers, intermediate oxidation pond, bottom heavy metal layer.
Preferably, according to displacement top and bottom process or U-Zr-O-Fe phasor miscibility gap range top and bottom process, first determine oxide phase and
Then each Matter Composition of metal phase calculates the density of oxide phase and metal phase；When the density of huge sum of money symbolic animal of the birth year is greater than oxide
When the density of phase, three layers of melting pool structure of bottom heavy metal layer, intermediate oxidation pond, top light metal layers are formed；Work as metal phase
Density when being less than the density of oxide phase, form two layers melting pool structure of the metal layer in upper, oxidation pond under.
Implementation method of the invention is as follows:
The invention proposes a kind of nuclear reactor severe accident relieving measure efficiency evaluation methods, and in particular to, reaction
When heap major accident reactor core fusant is moved in lower head, cooling provision and pressure outside Reactor cavity flooding pressure vessel is taken to hold
In device after water filling cooling provision, fusant is cooling in a kind of lower head is detained efficiency evaluation method.Specifically include determine opinion and
Crash analysis method (Risk-Oriented Accident Analysis Methodology, ROAAM) based on risk-oriented
Two kinds of evaluation methods.ROAAM evaluation method is it needs to be determined that at the beginning of the Uncertainty distribution and fusion pool of fusion pool original state parameter
Beginning state key parameter (decay heat, stainless steel gross mass, zirconium oxidation share, non-zirconium oxide participate in heavy metal layer layering ratio,
Stainless steel participate in heavy metal layer layering ratio) probability density distribution, then use Monte Carlo or other methods of samplings pair
Key parameter carries out n times and samples to obtain N group parameter value.ROAAM evaluation method is equivalent to the multiple meter determined by evaluation method
It calculates, the probability for forming two layers or three layers melting pool structure and the cooling probability distribution for being detained validity of fusant can be calculated.
Evaluation method of the invention can carry out fusant in lower head mixing based on composition, simply be layered two layers or
Three layers of melting pool structure are evaluated, and can also be carried out according to the composition parameters of fusant original state to fusion pool layered structure
Judge, determine each layer composition parameters after evaluated again, and be at home and abroad put forward for the first time three layers melting pool structures ROAAM comment
Valence method.
One or more technical solution provided by the present application, has at least the following technical effects or advantages:
Evaluation method of the invention can carry out fusion pool layered structure according to the composition parameters of fusant original state
Judgement, and the effect that the compatibility between fusant composition is layered fusion pool is considered, and be simultaneously at home and abroad put forward for the first time
The ROAAM evaluation method of three layers of melting pool structure, calculates the probability for forming two layers or three layers melting pool structure and fusant is cooling
It is detained the probability distribution of validity.Evaluation method of the invention can also be analyzed take in pressure vessel after water filling cooling provision under
The influence cooling to fusant of end socket fusion pool water layer air gap heat transfer model.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 is the flow diagram of the cooling delay efficiency evaluation method of fusant in lower head in the application；
Fig. 2 is U-Zr-O-Fe phasor schematic diagram in the application；
Fig. 3 is two layers of fusion pool structural schematic diagram (heat transfer of no water layer air gap) schematic diagram in the application；
Fig. 4 is three layers of fusion pool structural schematic diagram (heat transfer of no water layer air gap) schematic diagram in the application；
Fig. 5 is two layers of fusion pool structural schematic diagram (having the heat transfer of water layer air gap) schematic diagram in the application；
Fig. 6 is three layers of fusion pool structural schematic diagram (having the heat transfer of water layer air gap) schematic diagram in the application.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
Fig. 1-Fig. 6 is please referred to, when major accident occurs for nuclear reactor, when core exit temperature is greater than 650 degrees Celsius, throwing
Enter Reactor cavity flooding cooling system and carry out cooling outside pressure vessel, cooling migration resets the reactor core in lower head of pressure vessel
Fusant realizes that fusant is detained in lower head of pressure vessel, maintains the integrality of pressure vessel.Some nuclear reactors can also be same
When take in pressure vessel fusant cooling capacity in water filling cooling provision enhancing lower head of pressure vessel.Therefore, it is necessary to evaluate
The cooling validity being detained of fusant in lower head.The cooling efficiency evaluation schematic diagram that is detained of fusant is shown in Fig. 1 in lower head.
Embodiment 1:
Step 1: fusion pool original state parameter (decay heat, UO are determined2Gross mass, stainless steel gross mass, zirconium gross mass,
Zirconium aoxidizes share etc.) and fusion pool physical parameter, subsequently into step 2；
Step 2: fusant is cooling in selection lower head is detained efficiency evaluation method option:
Option 1: " determining opinion " evaluation method: when this method is employed, it is directly entered step 3；
Option 2: crash analysis method (the Risk-Oriented Accident Analysis based on risk-oriented
Methodology, ROAAM) evaluation method: when this method is employed, it is thus necessary to determine that the Uncertainty distribution of fusion pool parameter, really
Determining fusion pool original state key parameter, (decay heat, stainless steel gross mass, zirconium oxidation share, non-zirconium oxide participate in heavy metal layer
The ratio of layering, stainless steel participate in ratio etc. of heavy metal layer layering) probability density distribution, then using Monte Carlo or its
His methods of sampling is sampled key parameter to obtain combining parameter values, subsequently into step 3；
Step 3: selection lower head fusion pool layered structure option (fusion pool structure component is shown in Table 1), subsequently into step
Four:
Table 1
Option 1: two layers melts pool structure: two layers of melting pool structure based on composition mixing, being simply layered, metal phase and oxygen
Compound is mutually individually present；
2: three layers of melting pool structure of option (displacement top and bottom process, only limit and determine by evaluation method): based on composition mixing, simply
Three layers of melting pool structure of layering, metal phase are mutually individually present with oxide；
(U-Zr-O-Fe phasor miscibility gap range top and bottom process, only limit determines discusses evaluation side to 3: three layers of melting pool structure of option
Method): consider the effect that the compatibility between fusant composition is layered fusion pool；
Option 4: calculating judges to melt pool structure for two layers or three layers (displacement top and bottom process): based on composition mixing, simple point
Two layers or three layers melting pool structure of layer, metal phase are mutually individually present with oxide；
Option 5: calculating judges to melt pool structure for two layers or three layers (U-Zr-O-Fe phasor miscibility gap range top and bottom process):
Consider the effect that the compatibility between fusant composition is layered fusion pool；
Step 4: selection lower head geometry option, subsequently into step 5:
Option 1: spherical lower head；
Option 2: elliposoidal lower head；
Step 5: selection lower head fusion pool water layer air gap heat transfer model, subsequently into step 6:
Option 1: no water layer air gap heat transfer model: after reactor core fusant collapsing moves to lower head, lower head water is dry
When, select option 1；
Option 2: there is water layer air gap heat transfer model: when reactor core fusant collapsing starts to move to lower head, pressure vessel
Interior water injection method guarantees that water injection is arranged at fusant top, selects option 2；
Step 6: by above five steps, four kinds of fusion pool configuration states are determined, subsequently into step 7；
(1) two layers of melting pool structure (spherical or elliposoidal lower head) of no water layer air gap heat transfer, is shown in Fig. 3；
(2) three layers of melting pool structure (spherical or elliposoidal lower head) of no water layer air gap heat transfer, are shown in Fig. 4；
(3) two layers of the melting pool structure (spherical or elliposoidal lower head) for having water layer air gap to conduct heat, is shown in Fig. 5；
(4) the three layers of melting pool structure (spherical or elliposoidal lower head) for having water layer air gap to conduct heat, are shown in Fig. 6；
Step 7: it selects optimal fusion pool heat transfer relation formula to calculate fusant according to four kinds of fusion pool configuration states and arrives down
The heat flow density (with lower head angle change) of end socket, subsequently into step 8；
Step 8: in each angle of lower head, to the heat flow density of fusant to lower head and facing for lower head outside wall surface
Boundary's heat flow density (test determination or theory analysis) is compared, if outside fusant to the heat flow density of lower head and lower head
The ratio of the critical heat flux density of wall surface is less than 1, then fusant is cooling in lower head is detained effectively, and ratio is smaller, in lower head
The cooling effective allowance of delay of fusant is bigger.
Embodiment 2:
Calculating judges to melt pool structure for two layers or three layers of method of replacing are as follows: what is based on composition mixing, be simply layered melts
Melt pool structure, metal phase and oxide are mutually individually present to form layering；Bottom heavy metal layer is formed as UO2+ Zr=ZrO2
The displacement of+U chemically reacts, and assumes that uranium displacement ratio is related with the initial oxidation share of zirconium in the heavy metal layer of bottom.
When the density of heavy metal layer is greater than the density of oxidation pond, formation bottom heavy metal layer, intermediate oxidation pond, top are light
Three layers of melting pool structure of metal layer.When the density of heavy metal layer is less than the density of oxidation pond, metal layer is formed in upper, oxidation
Two layers melting pool structure of the pond under.
Embodiment 3:
It calculates and judges to melt pool structure for two layers or three layers of U-Zr-O-Fe phasor miscibility gap range layered approach are as follows: benefit
With miscibility gap range (see Fig. 2) in the U-Zr-O-Fe phasor of U/Zr=constant plane, judge that fusant is layered；If fusant
In miscible range, then fusant is uniformly distributed, if fusant is layered not in miscible range；Utilize U-
Miscibility gap range and equilibrium state line in Zr-O-Fe phasor, determine mole share of oxide phase and each composition of metal phase, then
Calculate the density of oxide phase and metal phase.
If the density of oxide phase is greater than the density of metal phase, metal layer is ultimately formed in upper, oxidation pond under
Two layers of melting pool structure；If the density of oxide phase is less than the density of metal phase, top light metal layers, centre are ultimately formed
Three layers of melting pool structure of oxidation pond, bottom heavy metal layer.
The present invention provides the cooling delay efficiency evaluation sides of fusant in lower head a kind of when nuclear reactor major accident
Method specifically includes " determining opinion " and " ROAAM " two kinds of evaluation methods." ROAAM " evaluation method is closed according to fusion pool original state
The probability density distribution of bond parameter judges fusion pool layered structure according to the composition parameters of fusant original state, counts
The formation probability for calculating two layers or three layers melting pool structure, the heat flow density and fusant for calculating fusion pool to lower head are cooling to be detained
The probability density distribution of validity.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. fusant is cooling in a kind of lower head is detained efficiency evaluation method, which is characterized in that the described method includes:
Step 1: fusion pool original state parameter is determined；
Step 2: fusant is cooling in selection lower head is detained efficiency evaluation method option, comprising:
Option 1: evaluation method is discussed using determining, enters step four；
Option 2: the crash analysis method based on risk-oriented is used, enters step three；
Step 3: determining the Uncertainty distribution of fusion pool parameter, determines the probability density of fusion pool original state key parameter
Distribution, is sampled key parameter to obtain combining parameter values, enters step four；
Step 4: selection lower head fusion pool layered structure；
Step 5: selection lower head geometry；
Step 6: selection lower head fusion pool water layer air gap heat transfer model；
Step 7: based on lower head fusion pool layered structure, lower head geometry, lower head fusion pool water layer air gap heat transfer mould
Type determines fusion pool configuration state；
Step 8: select optimal fusion pool heat transfer relation formula calculating fusant to the heat of lower head according to fusion pool configuration state
Current density；
Step 9: in each angle of lower head, by the critical heat of the heat flow density of fusant to lower head and lower head outside wall surface
Current density is compared, and obtains the cooling delay efficiency evaluation result of fusant in lower head based on comparative result.
2. fusant is cooling in lower head according to claim 1 is detained efficiency evaluation method, which is characterized in that lower envelope
First melt melt pool layered structure option includes:
Option 1: two layers melts pool structure；
Option 2: when using determining by evaluation method, layered approach is three layers of melting pool structure when replacing top and bottom process；
Option 3: when using determining by evaluation method, when layered approach is U-Zr-O-Fe phasor miscibility gap range top and bottom process
Three layers of melting pool structure；
Option 4: when layered approach is displacement top and bottom process, calculating judges to melt pool structure for two layers or three layers；
Option 5: when layered approach is U-Zr-O-Fe phasor miscibility gap range top and bottom process, calculating judges to melt pool structure for two layers
Or three layers.
3. fusant is cooling in lower head according to claim 1 is detained efficiency evaluation method, which is characterized in that lower envelope
It is several leading that how architectural options include:
Option 1: spherical lower head；
Option 2: elliposoidal lower head.
4. fusant is cooling in lower head according to claim 1 is detained efficiency evaluation method, which is characterized in that lower envelope
The option of first melt melt pool water layer air gap heat transfer model includes:
Option 1: no water layer air gap heat transfer model；Option 2: there is water layer air gap heat transfer model；When reactor core fusant collapsing moves to
After lower head, when lower head water dries up, no water layer air gap heat transfer model is selected；When reactor core fusant collapsing starts to move to lower envelope
When head, water injection method guarantees that water injection is arranged at fusant top in pressure vessel, and selection has water layer air gap heat transfer model.
5. fusant is cooling in lower head according to claim 1 is detained efficiency evaluation method, which is characterized in that melting
Pool structure state options include:
(1) two layers of the melting pool structure-spherical shape or elliposoidal lower head of no water layer air gap heat transfer；
(2) the three layers of melting pool structure-spherical shape or elliposoidal lower head of no water layer air gap heat transfer；
(3) two layers of the melting pool structure-spherical shape or elliposoidal lower head for thering is water layer air gap to conduct heat；
(4) the three layers of melting pool structure-spherical shape or elliposoidal lower head for thering is water layer air gap to conduct heat.
6. fusant is cooling in lower head according to claim 1 is detained efficiency evaluation method, which is characterized in that melting
Pond original state important parameter includes: decay heat, UO2Gross mass, stainless steel gross mass, zirconium gross mass, zirconium aoxidize share；It is based on
The crash analysis method of risk-oriented, it includes: decay that fusion pool original state, which needs the key parameter of predetermined probabilities Density Distribution,
Heat, stainless steel gross mass, zirconium oxidation share, non-zirconium oxide participates in the ratio of heavy metal layer layering, stainless steel participates in heavy metal layer
The ratio of layering.
7. fusant is cooling in lower head according to claim 2 is detained efficiency evaluation method, which is characterized in that be based on
The crash analysis method of risk-oriented when lower head fusion pool layered structure option is 1, counts the hot-fluid of two layers of melting pool structure
The probability density distribution of the ratio of density and critical heat flux density；When lower head fusion pool layered structure option is 4 and 5, first count
The formation probability for calculating two layers and three layers melting pool structure, then counts two layers, three layers of melting pool structure and fusion pool knot respectively
The probability density distribution of the ratio of the heat flow density and critical heat flux density of structure；Effective Probability of the ratio calculated less than 1, and ratio
Value is between 0.9 to 1.0 effective insufficient probability of allowance.
8. fusant is cooling in lower head according to claim 2 is detained efficiency evaluation method, which is characterized in that displacement
Three layers of top and bottom process melting pool structure are the melting pool structures based on composition mixing, being simply layered, light metal phase, oxide phase and
Huge sum of money symbolic animal of the birth year is individually present to form layering；The formation of bottom heavy metal layer is based on UO2+ Zr=ZrO2The displacement of+U chemically reacts,
And assume that uranium displacement ratio is related with the initial oxidation share of zirconium in the heavy metal layer of bottom.
9. fusant is cooling in lower head according to claim 2 is detained efficiency evaluation method, which is characterized in that U-
Three layers of melting pool structure of Zr-O-Fe phasor miscibility gap range top and bottom process are based on the compatibility between fusant composition to melting
Pond lamination；Judge that fusant is layered using miscibility gap range in the U-Zr-O-Fe phasor of U/Zr=constant plane；If molten
Melt object in miscible range, then fusant is uniformly distributed, if fusant is layered not in miscible range；Benefit
With miscibility gap range in U-Zr-O-Fe phasor and equilibrium state line, mole share of oxide phase and each composition of metal phase is determined,
Then the density of oxide phase and metal phase is calculated；The density of metal phase is greater than the density of oxide phase, forms top light metal
Layer, intermediate oxidation pond, bottom heavy metal layer three layers of melting pool structure.
10. fusant is cooling in lower head according to claim 2 is detained efficiency evaluation method, which is characterized in that meter
Calculation judges to melt pool structure for two layers or three layers of method are as follows: according to displacement top and bottom process or U-Zr-O-Fe phasor miscibility gap range
Top and bottom process first determines each Matter Composition of oxide phase and metal phase, then calculates the density of oxide phase and metal phase；When weight
The density of metal phase be greater than oxide phase density when, formed bottom heavy metal layer, intermediate oxidation pond, top light metal layers three
Layer melting pool structure；When the density of metal phase be less than oxide phase density when, formed metal layer upper, oxidation pond under two
Layer melting pool structure.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110489712A (en) * | 2019-08-08 | 2019-11-22 | 中国核动力研究设计院 | The method for obtaining melting pool surface heat flux density based on measurement data |
| CN112347621A (en) * | 2020-10-23 | 2021-02-09 | 中国核动力研究设计院 | Method and device for determining heat transfer of pressure vessel molten pool |
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