CN107863162B - The method that reactor is transformed into critical state from subcritical state - Google Patents
The method that reactor is transformed into critical state from subcritical state Download PDFInfo
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- CN107863162B CN107863162B CN201711220893.0A CN201711220893A CN107863162B CN 107863162 B CN107863162 B CN 107863162B CN 201711220893 A CN201711220893 A CN 201711220893A CN 107863162 B CN107863162 B CN 107863162B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/12—Means for moving control elements to desired position
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
Embodiment of the invention discloses a kind of methods that reactor is transformed into critical state from subcritical state, which comprises beam intensity reduces step: the beam intensity that will be used for the accelerator of the reactor under subcritical state reduces predetermined beam intensity;First control rod regulating step: the first control rod is adjusted in the length of the heap in-core of reactor;And steady operation step: make the reactor steady operation predetermined time, wherein circulation, which executes beam intensity, reduces step, the first control rod regulating step and steady operation step until beam intensity is reduced to predetermined value, the method also includes: cut off the line of accelerator;And the second control rod is gradually extracted, so that pile reactivity is gradually promoted to predetermined reactivity.Using the method for the embodiment of the present invention, conversion of the reactor from subcritical state to critical state is realized in the case where not shutdown.
Description
Technical field
The embodiment of the present invention is related to a kind of method that reactor is transformed into critical state from subcritical state.
Background technique
The Advanced Nuclear Energy Systems of Accelerator driven provide exogenous neutron by accelerator, and drive response piles up subcritical fortune
Row.
Summary of the invention
The purpose of embodiments of the invention is to provide a kind of sides that reactor is transformed into critical state from subcritical state
Method, thus for example, realizing conversion of the reactor from subcritical state to critical state in the case where not shutdown.
It is described the embodiment provides a kind of method that reactor is transformed into critical state from subcritical state
Reactor includes the first control rod with the first cross-sectional area and with the second cross section less than the first cross-sectional area
Second control rod of area, which comprises beam intensity reduces step: adding for the reactor under subcritical state will be used for
The beam intensity of fast device reduces predetermined beam intensity;First control rod regulating step: the first control rod is adjusted in the heap of reactor
The length of in-core;And steady operation step: making the reactor steady operation predetermined time, wherein circulation, which executes beam intensity, to be reduced
Step, the first control rod regulating step and steady operation step are reduced to predetermined value until beam intensity, the method also includes:
Cut off the line of accelerator;And the second control rod is gradually extracted, so that pile reactivity is gradually promoted to predetermined reactivity.
According to an embodiment of the invention, adjusting the first control rod in the length of the heap in-core of reactor includes by the first control
Stick extracts preset distance.
According to an embodiment of the invention, it includes the reactor that will be used under subcritical state that beam intensity, which is reduced to predetermined value,
The specified beam intensity of accelerator be reduced to predetermined value into a ladder within the predetermined time.
According to an embodiment of the invention, adjusting the temperature that length of first control rod in reactor makes the reactor core of reactor
Variation be less than ± 5 DEG C, changes of reactivity be less than 50pcm/ hours and Effective multiplication factor keff < 0.98.
According to an embodiment of the invention, the first control rod and the second control rod have circular cross section, and the first control
The diameter of stick processed is 1.5-2.5 times of the diameter of the second control rod.
According to an embodiment of the invention, the first control rod and the second control rod have roughly the same length.
According to an embodiment of the invention, it includes the reactor that will be used under subcritical state that beam intensity, which is reduced to predetermined value,
The specified beam intensity of accelerator reduce the beam intensity value of equal proportion respectively in the period of multiple equalizations.
According to an embodiment of the invention, the preset distance is the reactive variable quantity of reactor for needing to adjust and the
The ratio of the reactive variable quantity of reactor core of the every Moving Unit of one control rod apart from caused reactor.
According to an embodiment of the invention, reactor power be reduced to the reactor under subcritical state power it is pre-
Determine the line that accelerator is cut off when percentage.
According to an embodiment of the invention, the range of the predetermined percentage is 50% to 70%.
Using the method that reactor is transformed into critical state from subcritical state of embodiment according to the present invention, example
Such as, conversion of the reactor from subcritical state to critical state is realized in the case where not shutdown.
Detailed description of the invention
Fig. 1 is the stream of the method that reactor is transformed into critical state from subcritical state of embodiment according to the present invention
Cheng Tu;
Fig. 2 is the flow chart of the reactor operation of the Accelerator driven of embodiment according to the present invention;
Fig. 3 is the schematic diagram for reducing mode according to the beam intensity of the embodiment of the present invention;And
Fig. 4 is the reactor core structure figure of embodiment according to the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention will be further described.
Referring to Fig. 1 and Fig. 4, reactor is transformed into critical shape from subcritical state the embodiment provides a kind of
The method of state.The reactor includes the first control rod 2 with the first cross-sectional area and has less than the first cross section face
Second control rod 3 of the second long-pending cross-sectional area.The described method includes: beam intensity reduces step: subcritical shape will be used for
The beam intensity of the accelerator of reactor under state reduces predetermined beam intensity;First control rod, 2 regulating step: the first control is adjusted
Length of the stick 2 processed in the reactor core 1 of reactor;And steady operation step: make the reactor steady operation predetermined time.Circulation is held
Row beam intensity reduces step, 2 regulating step of the first control rod and steady operation step until beam intensity is reduced to predetermined value.
Judge whether beam intensity is lower than predetermined value, if beam intensity is greater than predetermined value, reduce step back to beam intensity,
If beam intensity is less than or equal to predetermined value, following step is executed.The method also includes: cut off the beam of accelerator
Stream;And the second control rod 3 is gradually extracted, so that pile reactivity is gradually promoted to predetermined reactivity.
According to an embodiment of the invention, adjusting length of first control rod 2 in the reactor core 1 of reactor includes by the first control
Stick 2 processed extracts preset distance.The preset distance is the reactive variable quantity and the first control rod 2 for needing the reactor adjusted
The ratio of the reactive variable quantity of reactor core 1 of every Moving Unit apart from caused reactor.Example according to the present invention is adjusted
Length of first control rod 2 in reactor makes the variation of the temperature of the reactor core 1 of reactor be less than ± 5 DEG C, and changes of reactivity is small
In 50pcm/ hours and Effective multiplication factor keff < 0.98.
According to an embodiment of the invention, it includes the reactor that will be used under subcritical state that beam intensity, which is reduced to predetermined value,
The specified beam intensity of accelerator be reduced to predetermined value into a ladder within the predetermined time.For example, beam intensity is reduced to
Predetermined value includes period of the specified beam intensity in multiple equalizations of the accelerator for the reactor that will be used under subcritical state
The beam intensity value of equal proportion is reduced respectively.According to an embodiment of the invention, reducing in step in beam intensity, secondary face will be used for
The beam intensity of the accelerator of reactor under boundary's state reduces predetermined beam intensity, and recycles and execute beam intensity reduction step
Suddenly, the first control rod regulating step and steady operation step are reduced to predetermined value until beam intensity.It is strong that line is executed in circulation
When degree reduces step, the first control rod regulating step and steady operation step, it can be not in predetermined all circulations of beam intensity
With, it is also possible to identical.For example, what predetermined beam intensity gradually reduced with being into the mode successively decreased or equal proportion.
According to an embodiment of the invention, the first control rod 2 and the second control rod 3 have circular cross section, and first
The diameter of control rod 2 is 1.5-2.5 times of the diameter of the second control rod 3.First control rod 2 and the second control rod 3 can have
Roughly the same length.
According to an embodiment of the invention, reactor power be reduced to the reactor under subcritical state power it is pre-
Determine the line that accelerator is cut off when percentage.The range of the predetermined percentage can be 50% to 70%.
Embodiment according to the present invention provides a kind of method that reactor is converted from subcritical state to critical state, can
With for burner subsystem (including reactor) in Advanced Nuclear Energy Systems in the case where not shutdown from subcritical state to facing
The conversion of boundary's state.For the conversion method the following steps are included: (1) reduces line, (2) adjust control rod.Control rod is divided into first
Control rod 2 and the second control rod 3, the shift strategy of two kinds of control rods and the reduction strategy of line can be true according to the following
It is fixed: (1) sub-critical reactor reactivity limitation (in the transition period, the changes of reactivity of reactor is less than 50pcm/ hours);(2) reactor core function
The stability of rate limits (changed power of heap is less than 5% initial power within the transition period);(3) heat of structural material and fuel is rushed
Hit limitation (rate temperature change is less than 60 DEG C/h).
According to an embodiment of the invention, the Advanced Nuclear Energy Systems of Accelerator driven provide exogenous neutron by accelerator, drive
Dynamic reactor cuts off its external drive after running 3-5, reactor, which is transited into, to be faced in subcritical operation in the case where not shutdown
The operation of boundary's state.
The method that the reactor of embodiment according to the present invention is converted from subcritical state to critical state is mainly used for solving
Certainly in Accelerator driven Advanced Nuclear Energy Systems burner subsystem in the case where not shutdown from subcritical state to critical state
The problem of conversion.
According to an embodiment of the invention, the Advanced Nuclear Energy Systems of Accelerator driven specifically include that burner subsystem (including
Reactor) and nuclear fuel regeneration post-processing subsystem.Burner subsystem includes high current superconducting proton linac, high power spallation
Neutron-producing target and high temperature fast reactor etc..Just when dress heap, entire nuclear power system needs to utilize superconduction straight line high current proton precessional magnetometer pair
Reactor carries out exogenous driving, and burner carries out burning proliferation, and production capacity, and this system operates under subcritical state at this time;
After running 3~5 years in this case, superconduction straight line high current proton precessional magnetometer is cut off in the case where not shutdown, stops burner
The driving of external neutrons source, hereafter burner is changed into self-sustaining burning state, this system is run under critical conditions.
According to an embodiment of the invention, the substantially mistake that burner subsystem is run in the Advanced Nuclear Energy Systems of Accelerator driven
Journey is as shown in Figure 2: (1) particle injects, flowing preheating.Just when dress heap, the solid particle as neutron-producing target, coolant is needed from outer
Inside boundary's piii reactor, particle preheats while flowing in injection process, and the work of preheating is in particle storage device
It completes, the particle after preheating transfers heat to reactor, stops preheating when reactor internal temperature balance.(2) control rod
In place, make the control of reactor initial reactivity between 0.96~0.98.First control rod 2 is extracted completely, the second 3, control rod
Divide insertion, the value of 3 insertion portion of the second control rod is βeff~2 βeff(βeffFor delayed neutron fraction).First control rod 2 is used
In: 1, the reactivity control of reactor subcritical operation phase;2, the second control rod 3 of joint is subcritical to critical mistake in reactor
It is converted in journey;3, it is used as safety rod when reactor critical operation.Second control rod 3 is used for: 1, it is subcritical to control reactor
To critical conversion;2, the reactivity of control reactor under critical conditions.(3) add line.After everything in readiness, superconduction is straight
Line high current proton precessional magnetometer starts to generate proton beam, and the line of generation bombards on particle target, and driving burner burns.
(4) normal subcritical reactor operating condition.After reactor start-up, since there are phase changes for the reactivity of reactor, need at this time
The first control rod 2 and beam intensity are alternately adjusted, maintains pile reactivity and power in secure threshold, system stablizes fortune
Row is under normal subcritical reactor operating condition.First control rod 2 certain distance in intercalation reaction heap at this time.(5) secondary to face
Boundary --- critical conversion.When reactor operation 3 to 5 years, the reactivity of reactor reach certain threshold value and it is stable after, surpass
The external neutrons source driving that straight line high current proton precessional magnetometer cuts off it to burner is led, the first control rod 2 and the second control rod 3 are matched
Cooperation is used so that the reactivity of reactor is in critical state.(6) normal critical reactor operating condition is run.Burner changes completely
After self-sustaining burning state, this system is as run under critical conditions, and critical state is completely by the second control in reactor
3 pairs of reactivity of stick control, and the function of the first control rod 2 then becomes safety rod.(7) shutdown.As reactor operation 30-50
Afterwards, reactor needs shutdown to handle to a certain extent for nuclear fuel burning, i.e., comes out the fuel assembly dismantling of heap in-core, be transported to
Nuclear fuel regeneration post-processes the processing that subsystem carries out nuclear fuel.(8) coolant stops and is discharged.Although reactor stops work
Make, but its internal temperature is still very high, coolant particle is there is still a need for circulating to take away heat, when reactor inside temperature
Particle coolant could stop flowing and being expelled to specified container after degree reaches designated value.
Reactor is subcritical to need a process to critical conversion, and an example of the invention proposes a kind of conversion
Method, specific steps are as follows:
(1) reduce line: by the specified beam intensity I of accelerator in subcritical reactor0Within the h time (h≤30 day) at
It reduces in ladder shape to I0'sTimes, 50≤Z≤100, i.e., as shown in figure 3, surrounding time section line decline intensity has such as ShiShimonoseki
System:Wherein W is the time hop counts divided, i.e., setting is by beam intensity from I0It is reduced toIt needs W times
It completes, W >=15, every section of time equalization, duration is t,IktFor the beam intensity at kt moment, I(k-1)tFor (k-1) t moment
Beam intensity, (k=1,2,3 ... W), unit is mA.
(2) the first control rod 2 is adjusted: as shown in figure 4, the first control rod 2 and the second control rod 3 in reactor core 1
Length it is identical, consistent with the height of reactor core 1, the diameter of the first control rod 2 is approximately 1.5-2.5 times of the second control rod 3,
Identical material, such as boron carbide, cadmium, silver-colored indium cadmium can be used in the two.When line reduces, the neutron that spallation target generates can subtract
Few, the parameters such as reactivity, temperature of reactor can reduce, but actual conditions must assure that the reactivity of reactor maintains normally
Operating condition, i.e. temperature inside reactor substantially remain in a small range fluctuation, and temperature change fluctuation is less than ± 5 DEG C, reactivity
Variation is less than 50pcm/ hours, Effective multiplication factor keff < 0.98.This is just needed while reducing line, slowly adjusts
One control rod 2, the extraction of the first control rod 2 can improve reactivity, and insertion can inhibit reactivity.
After the completion of each line decline, system can measure in real time and calculate the real reaction in reactor and setting
The difference ρ of secure thresholdx, the first control rod 2 is adjusted later, is equivalent to ρ to makexThe control of changes of reactivity amount.The
The moving distance of one control rod 2 can be calculated according to the following formula:Wherein, HX is the first control rod 2
Need mobile distance;ρxReactive variable quantity in the reactor adjusted for actual needs;ρ0Parameter is measured for experiment, is represented
Reactive variable quantity in reactor caused by the every Moving Unit distance (per cm) of the type control rod;H0For initial baseline away from
From (according to actual needs, a position artificially being set on the first control rod 2 as initial position, each parameter is when calculating with this
It is calculated on the basis of one initial position).After calculating the mobile distance of the first control rod 2, the first control rod 2 is adjusted
Section, will be in the parameter regulations to normal range (NR) such as reactivity, temperature inside reactor.
(3) steady decrease core power.After reducing line, adjusting the first control rod 2, system needs to carry out certain time
Steady operation could reduce line again after parameters are in nominal situation, and repeat above-mentioned to the first control rod
2 adjustment process, i.e. circulation execute step (1), (2), (3), until beam intensity is reduced toReactor enters Asia and faces at this time
Boundary's state, core power are reduced to 60% or so of subcritical power.
(4) the second control rod 3 is adjusted.Subcritical state be in it is subcritical with it is critical between short transition state, this
When reactor core reactivity be about 1- βeff, to reactor core it is in stable condition after, cut off accelerator line, beam intensity byIt falls immediately to
0;Then, the second control rod 3 starts to extract, and makes pile reactivity slowly from 1- β in 2 hourseffIt is promoted to 1~1+ βeff。
Reactor core is run thence into critical conduction mode, when core power rises to 100% rated power by 60% or so rated power, heap
Core is transitioned into normal critical operating status completely.Under critical conditions, the adjusting of pile reactivity is by the second control rod 3 complete
At the function of the first control rod 2 then becomes safety rod.
The conversion method that the embodiment of the present invention proposes can safely and effectively realize burner in Advanced Nuclear Energy Systems
Conversion of the system from subcritical state to critical state makes inside reactor in nominal situation.
Notwithstanding above-mentioned various embodiments, but the method for the embodiment of the present invention can be used for it is any suitable
Conversion of the reactor to critical state under the subcritical state of Accelerator driven.In addition, notwithstanding various numberical ranges
And designated value, but these numberical ranges and designated value can be adjusted according to actual condition.
Claims (10)
1. a kind of method that reactor is transformed into critical state from subcritical state, the reactor includes transversal with first
First control rod of face area and the second control rod with the second cross-sectional area less than the first cross-sectional area,
The described method includes:
Beam intensity reduces step: the beam intensity that will be used for the accelerator of the reactor under subcritical state reduces predetermined line
Intensity;
First control rod regulating step: the first control rod is adjusted in the length of the heap in-core of reactor;And
Steady operation step: making the reactor steady operation predetermined time,
Wherein circulation, which executes beam intensity, reduces step, the first control rod regulating step and steady operation step until beam intensity
Predetermined value is reduced to,
The method also includes:
Cut off the line of accelerator;And
The second control rod is gradually extracted, pile reactivity is made gradually to be promoted to predetermined reactivity.
2. the method according to claim 1 that reactor is transformed into critical state from subcritical state, wherein
It includes that the first control rod is extracted preset distance that the first control rod, which is adjusted, in the length of the heap in-core of reactor.
3. the method according to claim 1 that reactor is transformed into critical state from subcritical state, wherein
It includes the specified beam intensity of the accelerator for the reactor that will be used under subcritical state that beam intensity, which is reduced to predetermined value,
It is reduced to predetermined value into a ladder within the predetermined time.
4. the method according to claim 1 that reactor is transformed into critical state from subcritical state, wherein
Adjust length of first control rod in reactor make reactor reactor core temperature variation be less than ± 5 DEG C, reactivity
Variation is less than 50pcm/ hours and Effective multiplication factor keff < 0.98.
5. the method according to claim 1 that reactor is transformed into critical state from subcritical state, wherein
First control rod and the second control rod have circular cross section, and the diameter of the first control rod is the second control rod
1.5-2.5 times of diameter.
6. the method that reactor is transformed into critical state from subcritical state according to claim 1 or 5, wherein
First control rod and the second control rod have roughly the same length.
7. the method according to claim 1 that reactor is transformed into critical state from subcritical state, wherein
It includes the specified beam intensity of the accelerator for the reactor that will be used under subcritical state that beam intensity, which is reduced to predetermined value,
Reduce the beam intensity value of equal proportion respectively in the period of multiple equalizations.
8. the method according to claim 2 that reactor is transformed into critical state from subcritical state, wherein
The preset distance is the reactive variable quantity and the every Moving Unit distance of the first control rod for needing the reactor adjusted
The ratio of the reactive variable quantity of the reactor core of caused reactor.
9. the method according to claim 1 that reactor is transformed into critical state from subcritical state, wherein
Accelerator is cut off when the power of reactor is reduced to the predetermined percentage of the power of the reactor under subcritical state
Line.
10. the method according to claim 9 that reactor is transformed into critical state from subcritical state, wherein
The range of the predetermined percentage is 50% to 70%.
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CN1134197A (en) * | 1993-10-29 | 1996-10-23 | 卡洛·鲁布比亚 | Energy amplifier for "clean" nuclear energy production driven by particle beam accelerator |
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KR101536675B1 (en) * | 2010-03-29 | 2015-07-14 | 제이콥스 이앤드씨 리미티드 | Accelerator-driven nuclear system with control of effective neutron multiplication coefficent |
WO2013187974A2 (en) * | 2012-04-05 | 2013-12-19 | Shine Medical Technologies, Inc. | Aqueous assembly and control method |
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CN1134197A (en) * | 1993-10-29 | 1996-10-23 | 卡洛·鲁布比亚 | Energy amplifier for "clean" nuclear energy production driven by particle beam accelerator |
CN102084434A (en) * | 2008-05-02 | 2011-06-01 | 阳光医疗技术公司 | Device and method for producing medical isotopes |
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