CN1147873C - High-flux neutron slowing down package - Google Patents
High-flux neutron slowing down packageInfo
- Publication number
- CN1147873C CN1147873C CNB021144737A CN02114473A CN1147873C CN 1147873 C CN1147873 C CN 1147873C CN B021144737 A CNB021144737 A CN B021144737A CN 02114473 A CN02114473 A CN 02114473A CN 1147873 C CN1147873 C CN 1147873C
- Authority
- CN
- China
- Prior art keywords
- slowing down
- liquid hydrogen
- bag
- hydrogen
- cup core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- 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
Landscapes
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The present invention discloses a high flux neutron slowing down package in a nuclear reactor cold neutron source device, which is placed in a vertical pore passage in a reactor. The neutron slowing down package is composed of a package body casing and a built-in cup core. The top of the slowing down package is connected with a liquid hydrogen pipe and an air hydrogen pipe; the top of the built-in cup core of the slowing down package is provided with a plurality of column-shaped pores communicated with the air hydrogen pipe; an annular space formed by the cup core and a barrel-shaped package body is filled with liquid hydrogen to slowing down a neutron. The present invention has the key point that a plurality of column-shaped pores are arranged at the top of the cup core which is made into a cone shape; the present invention reduces above 36% of the air overflow quantity of the liquid hydrogen in the annular passage and lowers the air content of the liquid hydrogen in the annular passage to below 20% from above 40%.
Description
One, affiliated field
The present invention relates to a kind of moderation of neutrons bag of nuclear reactor cold neutron source device, particularly a kind of high flux moderation of neutrons bag in the nuclear reactor cold neutron source device.
Two, background technology
The structure of the moderation of neutrons bag of nuclear reactor cold neutron source commonly used is the drum or the oval bucket of sealing, be placed with one inverted glass of core in the bucket, they form the annular space of 10mm～20mm between the two, are recycled the defeated next liquid hydrogen of pipeline and fill with, and are used for the moderation of neutrons of high speed high humidity is cooled off.As, by French Orphee heap
[1]Moderation of neutrons (cold) pack arrangement that proposes as shown in Figure 1, it is to be made by almag, fill the liquid hydrogen of about 20K temperature that feed pipe sends here in the bag, speed obtains slowing down when the high-speed neutron bundle passes annular in the cold bag or oval ring liquid hydrogen layer, obtains maximum liquid hydrogen layer thickness 15mm～20mm that can gain per stage.Yet be subjected to the liquid hydrogen layer of neutron and radiation exposure thereof and metal material all can produce big calorimetric, this will rely on the explosive evaporatoin of liquid hydrogen to absorb, the hydrogen that slowing down bag bottom and annular on every side liquid hydrogen evaporation are produced all will be discharged to the top of bag from annular liquid hydrogen layer, send to cooling by gas outlet.The used metal material of this slowing down bag is few, and the liquid hydrogen layer thickness that forms in the projecting plane of whole bag is even, and can form good hydrogen closed circuit, so often be used.
Below be the list of references that the applicant retrieves:
[1]B.Farnux?and?P.Breant，Upgrade?of?the?experimental?Facilitiesof?the?Orphee?Reactor，proceedings?of?the?third?Meeting?of?theInternational?Group?on?research?Reactors(IGORR-III)，September?30-October1，1993，Japan?Atomic?Energy?Institute(JEARI)
Above-mentioned slowing down bag is when being used for the moderation of neutrons of high energy level reactor high flux, the heat that produces is very big, the boil-off gas that produces is also a lot, by slowing down bag bottom and the hydrogen that liquid hydrogen evenly produces in the circular passage on every side all to overflow liquid level from the circular passage of waiting width, position on the circular passage especially, the volume void fraction of liquid hydrogen surpasses more than 30%, can not guarantee that enough liquid gas pay thicknesses come degraded neutron.Therefore, the moderation of neutrons bag of design new construction significantly descends the liquid hydrogen void fraction in the circular passage, guarantees the good slowing down effect of neutron is very important.
Three, summary of the invention
Defective or deficiency according to above-mentioned prior art exists the objective of the invention is to, and improve on the structure of original moderation of neutrons bag, and a kind of high flux moderation of neutrons bag is provided.
To achieve these goals, the technical scheme that the present invention takes is: this high flux moderation of neutrons bag is placed in the cylinder 1 of an appellation vertical channel, the slowing down bag comprises inclusion shell 2, be provided with the cup core 3 of an inversion cup-shaped in the inclusion shell 2, the top of slowing down bag inclusion shell 2 is connected with liquid hydrogen pipe 4 gentle hydrogen pipes 5, be characterized in that the top of slowing down bag inner cup core 3 is provided with several cylindricality apertures 6 that communicate with gas hydrogen pipe 5; The cup core 3 of described slowing down bag is for having the shape of tapering.
The purpose that cylindricality aperture 6 is set is discharge by slowing down bag bottom metal material and liquid hydrogen and generate heat and the evaporation hydrogen of generation, rather than as original structure, the hydrogen of bottom can only be discharged in the exterior annular liquid hydrogen layer by jagged aperture, cup core bottom.
The cup core 3 of slowing down bag is for having the shape of tapering, be to broaden gradually from the passage that the liquid hydrogen layer overflows for the gas hydrogen that makes evaporation, this helps the discharge of gas on the one hand, makes the true liquid hydrogen thickness of the higher top liquid hydrogen layer of void fraction be not less than the needed thickness of degraded neutron on the other hand.
The present invention is 4～5 * 10 for neutron flux
14N/cm
2S, the irradiation cross section is the moderation of neutrons bag of 200 * 200mm, 3.17 liters/second when adopting gas flow that the perforate technology of this patent can make circular passage in the bag from former not perforate drop to 2.02 liters/second.Add original parallel annular passage become and be that tapered channel, total implementation result can make void fraction in the bag internal upper part liquid hydrogen from dropping to below 20% more than 40%.
Four, description of drawings
Fig. 1 is the structural drawing of moderation of neutrons (cold) bag of French Orphee heap proposition;
Fig. 2 is the structural drawing of moderation of neutrons bag of the present invention;
Fig. 3 is the liquid level illustraton of model of moderation of neutrons bag of the present invention.
Five, embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 2～3, the high flux moderation of neutrons bag by technical scheme of the present invention is made comprises one-vertical channel 1 equally, is placed with drum shape or oval barrel-shaped slowing down bag in the duct, and the slowing down bag is made up of the cup core 3 of inclusion shell 2 and inversion cup-shaped.Slowing down inclusion shell 2 is connected with liquid hydrogen pipe 4 gentle hydrogen pipes 5 at the top, and the top of slowing down bag inner cup core 3 is provided with several cylindricality apertures 6 that communicate with gas hydrogen pipe 5; The cup core 3 of described slowing down bag is for having the shape of tapering.
The purpose that cylindricality aperture 6 is set is discharge by slowing down bag bottom metal material and liquid hydrogen and generate heat and the evaporation hydrogen of generation, rather than as original structure, the hydrogen of bottom can only be discharged in the exterior annular liquid hydrogen layer by jagged aperture, cup core bottom.But glass aperture that core top is provided with should equal the poor of outside liquid hydrogen liquid level of glass core and cup core bottoms level to the fluid resistance losses of the pass through hydrogen generation of flowing out.The cylindricality short tube that is provided with on the hole is not influenced by glass circulation liquid hydrogen of core lateral current downflow in order directly gas to be discharged to bag top air phase volume; The diameter in cylindricality aperture 6 and quantity can specifically be set according to gas hydrogen flow and the outer liquid level difference of cup in-core that slowing down bag bottom is produced.
The cup core 3 of slowing down bag is for having the shape of tapering, be to broaden gradually from the passage that the liquid hydrogen layer overflows for the gas hydrogen that makes evaporation, this helps the discharge of gas on the one hand, makes the true liquid hydrogen thickness of the higher top liquid hydrogen layer of void fraction be not less than the needed thickness of degraded neutron on the other hand.
Adopt the present invention, can make the circular passage liquid hydrogen overflow the tolerance minimizing more than 36%, the liquid hydrogen air content that makes the circular passage is from dropping to below 20% more than 40%.The present invention intends being recommended in the cold neutron source device of " Chinese advanced research reactor " that China building and adopts.
Claims (1)
1. high flux moderation of neutrons bag, it is positioned in the vertical channel [1] in the reactor, and the slowing down bag is made up of an inclusion shell [2] and a glass core [3]; Slowing down bag top is connected with the gentle hydrogen pipe of liquid hydrogen pipe [4] [5], it is characterized in that, the top of slowing down bag inner cup core [3] is provided with the cylindricality aperture [6] that communicates with gas hydrogen pipe [5]; The cup core [3] of described slowing down bag is for having the drum or the oval barrel-shaped shape of tapering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021144737A CN1147873C (en) | 2002-03-19 | 2002-03-19 | High-flux neutron slowing down package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021144737A CN1147873C (en) | 2002-03-19 | 2002-03-19 | High-flux neutron slowing down package |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1371103A CN1371103A (en) | 2002-09-25 |
| CN1147873C true CN1147873C (en) | 2004-04-28 |
Family
ID=4743118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021144737A Expired - Fee Related CN1147873C (en) | 2002-03-19 | 2002-03-19 | High-flux neutron slowing down package |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1147873C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546611B (en) * | 2009-04-24 | 2011-07-27 | 西安交通大学 | Neutron moderation bag for single-phase moderator circulation |
| CN105976887A (en) * | 2016-06-30 | 2016-09-28 | 中国工程物理研究院材料研究所 | Slowing-down device shell cadmium layer coating method |
-
2002
- 2002-03-19 CN CNB021144737A patent/CN1147873C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1371103A (en) | 2002-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040428 |