CN109858051A - Nuclear power plant instructs the dosage rate evaluation method of protective action based on operation action level - Google Patents
Nuclear power plant instructs the dosage rate evaluation method of protective action based on operation action level Download PDFInfo
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- CN109858051A CN109858051A CN201711241927.4A CN201711241927A CN109858051A CN 109858051 A CN109858051 A CN 109858051A CN 201711241927 A CN201711241927 A CN 201711241927A CN 109858051 A CN109858051 A CN 109858051A
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Abstract
The invention belongs to emergency responses of nuclear accident technical fields, are related to the dosage rate evaluation method that nuclear power plant instructs protective action based on operation action level.For the dosage rate evaluation method when nuclear power plant instructs emergency protective action based on operation action level, dosage rate evaluation method derives the distance of the dosage rate of specified distance or the point of given dose rate.Utilize dosage rate evaluation method of the invention, it can be when nuclear power plant instructs emergency protective action based on operation action level, dosage rate evaluation method replaces the dosage rate of the dosage rate data derivation specified distance of nearest monitoring point, the dosage rate values of specified distance to make are more accurate, are more convenient for carrying out emergency protective action in time according to this value.
Description
Technical field
The invention belongs to emergency responses of nuclear accident technical fields, are related to nuclear power plant and are based on operation action level guidance protection row
Dynamic dosage rate evaluation method.
Background technique
Operating action level (Operation intervention level, abbreviation OIL) is with environmental monitoring results table
The action level shown is expressed as radionuclide or measurable dosage rate in environment or foodstuff samples.It is by leading to accordingly
With optimization action level or the level value extrapolated of universal mobile level, can directly with instrument monitoring result or lab analysis knot
Fruit is compared.Under emergency conditions, monitoring data or Analytical Laboratory Results are compared with OIL default value, when default value is surpassed
It is out-of-date, it is desirable that take corresponding protection and response activities.Determine that protection appropriate is gone according to environmental measurement immediately using OIL
It is dynamic, so that protective action be made to meet practical emergency demand.
But when carrying out protective action based on OIL under nuclear power plant's accident, the dosage rate according to specified distance is needed, and
Under actual conditions the dosage rate of specified distance due to landform may not be able to obtain (under nuclear power plant's accident emergency monitoring unit due to
Landform possibly can not reach distance to a declared goal and be monitored).The way that domestic nuclear power plant is directed to this case at present is if do not had
Ambient enviroment dosage rate data at OIL, just using the dosage rate data of nearest monitoring point compared with OIL default value, when
When default value is exceeded, it is desirable that take corresponding protection and response activities.But it is often deposited using the dosage rate of nearest monitoring point
In deviation, this is possible to the timely development for delaying emergency protective action.
Summary of the invention
The object of the present invention is to provide nuclear power plants to instruct the dosage rate evaluation method of protective action based on operation action level,
With can nuclear power plant be based on operation action level instruct emergency protective action when, dosage rate evaluation method replace recently prison
The dosage rate data of measuring point derive the dosage rate of specified distance, so that the dosage rate values of the specified distance made are more quasi-
Really, it is more convenient for carrying out emergency protective action in time according to this value.
In order to achieve this, the present invention provides nuclear power plant and is based on operation action level guidance in the embodiment on basis
The dosage rate evaluation method of protective action, the dosage rate evaluation method are based on operation action level guidance emergency in nuclear power plant
When protective action, dosage rate evaluation method derives the distance of the dosage rate of specified distance or the point of given dose rate.
In a preferred embodiment, the present invention provides nuclear power plant and instructs protective action based on operation action level
Dosage rate evaluation method, wherein (Departure operation intervenes water to the dosage rate evaluation method estimation operation action level OIL1
It is flat), OIL2 (taking crystalline flake of iodine operation action level) and OIL4 (keep away to move and operate action level) the ambient enviroment agent of value corresponding location
Dose rate.
In a preferred embodiment, the present invention provides nuclear power plant and instructs protective action based on operation action level
Dosage rate evaluation method, wherein the dosage rate evaluation method estimates given dose rate in radioactivity plume according to the following formula
Distance on axis,
In formula:
R1Be Dose rate measurement value be D1Known distance of the known point on the radioactivity plume axis of ground level；
R2Be given dose rate value be D2Estimated distance of the unknown point on the radioactivity plume axis of ground level；
X is the diffusivity of distance function.
In a kind of more preferred embodiment, the present invention provides nuclear power plant and is based on operation action level guidance protection row
Dynamic dosage rate evaluation method, wherein when stability is A or B, x=2；When stability is C or D, x=1.5；Work as stability
When for E or F, x=1.
The beneficial effects of the present invention are instruct protective action based on operation action level using nuclear power plant of the invention
Dosage rate evaluation method, can be when nuclear power plant instructs emergency protective action based on operation action level, the estimation of dosage rate
Method replaces the dosage rate of the dosage rate data derivation specified distance of nearest monitoring point, thus the specified distance made
Dosage rate values are more accurate, are more convenient for carrying out emergency protective action in time according to this value.
The present invention solve under nuclear power plant's accident based on operation action level carry out protective action when, need according to it is specific away from
From place's dosage rate, and specified distance dosage rate can not obtain this problem in practical situations.This method is suitable for nuclear power plant
Emergency protective action under emergency conditions, can provide emergency protective action suggestion in time, and it is anti-that when accident emergency can be used as emergency
Action decision tool is protected, important field data reference is provided for Emergency decision person, with important economic value and social valence
Value.
Specific embodiment
Illustrative nuclear power plant of the invention instructs the dosage rate evaluation method of protective action based on operation action level
Principle is as follows.
It is heavy in nuclear accident early monitoring team task, while being likely to occur when accident pattern, release source item and response
Special environment condition can not determine the environmental monitoring knot for having reached operation action level (OIL1, OIL2 and OIL4 value) in a short time
Distance where fruit, it is therefore desirable to the ambient enviroment agent of estimation operation action level (OIL1, OIL2 and OIL4 value) corresponding location
Dose rate.
According to measuring some dosage rates from point of release known distance on the radioactivity plume axis of ground level, and
By assuming that radioactivity plume axis dosage rate is inversely proportional at a distance from point of release, calculated using these data other selected
Lower wind direction is apart from upper dosage rate.Calculation formula is specific as follows:
In formula:
D1It is the distance R on the radioactivity plume axis of ground level1Locate the dosage rate of measurement；
D2It is the distance R on the radioactivity plume axis of ground level2Locate the dosage rate of measurement；
X is that the diffusivity of distance function (when stability is A or B, can accurately apply x=2；When stability is C or D
When, using x=1.5；When stability is E or F, using x=1).
Intervene computing module by operation and correction module obtains R1The OIL value at place, in order to determine the protection of accident early stage
Action needs to determine the boundary for reaching operation action level as early as possible, then just need according to the dosage rate known at distance,
Seek the distance for reaching operation action level value.Formula, which derives, to be estimated to dosage rate, distance R is sought in export2Formula such as
Under:
In formula:
R1Be Dose rate measurement value be D1Known distance of the known point on the radioactivity plume axis of ground level；
R2Be given dose rate value be D2Estimated distance of the unknown point on the radioactivity plume axis of ground level；
X is that the diffusivity of distance function (when stability is A or B, can accurately apply x=2；When stability is C or D
When, using x=1.5；When stability is E or F, using x=1).
The dosage rate evaluation method of the invention of above-mentioned example instructs emergency protective action to illustrate compared with conventional method
It is as follows.
When simulating nuclear accident generation, when the atmospheric stability of meteorological condition is E, the default value of OIL and above-mentioned dose of use
The dosage rate estimated value that dose rate evaluation method obtains is as shown in table 1 below, and it is as follows to have stationary monitoring point actual dose rate monitor value
Shown in table 2.
1 OIL default value of table and dosage rate estimated value
Table 2 has stationary monitoring point actual dose rate monitor value
| Distance | 0.6km | 3km | 8km | 15km | 20km |
| Actual monitoring value (mSv/h) | 1.5 | 1.1 | 0.7 | 0.3 | 0.01 |
By the result of Tables 1 and 2 it is found that instructing emergency protective action using the actual monitoring value of existing stationary monitoring point
When, the public within 3km needs to withdraw or hidden；And if when dosage rate estimated value instructs emergency protective action, 5km with
The interior public needs to withdraw or hidden.Using dosage rate evaluation method of the invention instruct emergency protective action more accurately with patch
It is close practical.
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.Above-described embodiment or embodiment are only to the present invention
For example, the present invention can also be implemented with other ad hoc fashions or other particular form, without departing from of the invention
Main idea or substantive characteristics.Therefore, the embodiment of description is regarded as illustrative and non-limiting in any way.This
The range of invention should be illustrated that any variation equivalent with the intention and range of claim also should include by appended claims
Within the scope of the invention.
Claims (4)
1. the dosage rate evaluation method that nuclear power plant instructs protective action based on operation action level, it is characterised in that: the agent
When nuclear power plant instructs emergency protective action based on operation action level, dosage rate evaluation method derives dose rate evaluation method
The distance of the point of the dosage rate or given dose rate of specified distance.
2. dosage rate evaluation method according to claim 1, it is characterised in that: the dosage rate evaluation method estimates behaviour
Make the ambient enviroment dosage rate of action level OIL1, OIL2 and OIL4 value corresponding location.
3. dosage rate evaluation method according to claim 1, which is characterized in that the dosage rate evaluation method according to
Distance of the lower formula estimation given dose rate on radioactivity plume axis,
In formula:
R1Be Dose rate measurement value be D1Known distance of the known point on the radioactivity plume axis of ground level；
R2Be given dose rate value be D2Estimated distance of the unknown point on the radioactivity plume axis of ground level；
X is the diffusivity of distance function.
4. dosage rate evaluation method according to claim 3, it is characterised in that: when stability is A or B, x=2；When steady
When fixed degree is C or D, x=1.5；When stability is E or F, x=1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110991809A (en) * | 2019-11-06 | 2020-04-10 | 中国辐射防护研究院 | Reactor core inventory real-time estimation method based on Hualong I |
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| CN103903106A (en) * | 2014-04-21 | 2014-07-02 | 苏州热工研究院有限公司 | Nuclear emergency decision supporting platform and method based on operation disturbance level |
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