CN101676703B - Apparatus for detecting leakage from channel closure plug for fuel channel in heavy water reactor - Google Patents
Apparatus for detecting leakage from channel closure plug for fuel channel in heavy water reactor Download PDFInfo
- Publication number
- CN101676703B CN101676703B CN200910171889.9A CN200910171889A CN101676703B CN 101676703 B CN101676703 B CN 101676703B CN 200910171889 A CN200910171889 A CN 200910171889A CN 101676703 B CN101676703 B CN 101676703B
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- China
- Prior art keywords
- signal
- fuel channel
- heavy water
- channel
- end fitting
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- 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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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/002—Detection of leaks
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- General Physics & Mathematics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Disclosed herein is an apparatus for detecting leakage of heavy water from a fuel channel in a heavy water reactor. The apparatus includes a signal collector equipped with a piezoelectric acoustic sensor and a high-frequency microphone acoustic sensor contacting an end fitting of a channel closure plug, a driver moving and contacting the signal collector to the end fitting of the channel closure plug, a control and power supply unit controlling the driver and supplies power to the driver and a signal amplifier, a signal amplifier amplifying the measured signal, and a signal analyzer processing and displaying the measured signal. The apparatus is engaged with a head of a fuelling machine and approaches, along with the fuelling machine, each channel closure plug to perform leakage examination. Since the apparatus uses a fuelling machine which is in use in a power plant to examine the fuel channel, and simultaneously measures acoustic signals from the inside and outside of the fuel channel, it is possible to quickly perform the examination, prevent the inspector from being exposed to the radiation, and to prevent heavy water from leaking from the channel closure plug of the fuel channel.
Description
Technical field
The present invention relates to a kind of equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor, relate in particular to a kind of piezoelectricity sonic transducer and microphone sonic transducer of utilizing and detect the equipment that the pipe sealing plug on the fuel channel in heavy water reactor leaks, this piezoelectricity sonic transducer and microphone sonic transducer are all inserted in signal picker, to measure from the inside and outside acoustical signal of this pipe sealing plug simultaneously.
Background technology
Heavy water reactor has fuel channel closing plug, its with act on closed conduit closing plug end fitting, prevent that heavy water from leaking and the approach of the fuel of reloading.Sealing structure inserts ring by metal sealing and pipe sealing forms.Sealing structure is arranged on each end fitting of 380 fuel channels, and when needs refuelling, this pipe sealing plug periodically unloads and is assembled on this fuel channel from this fuel channel.
Because exotic flow into the pressure that this fuel channel causes solid exotic under seal pad partial rupture and high temperature and high pressure when unloading and installing fuel channel closing plug, or because the airtight fault that poor sealing and degeneration parts cause, heavy water all may leak from fuel channel.Measurement Technology of Acoustic Emission has been used to during reactor operation, and examination and controlling heavy water is from the leakage of fuel channel.
Fig. 1 is the skeleton view of heavy water reactor, and wherein Ref. No. 100 represents heavy water reactor, and Ref. No. 101 represents one group of fuel channel.This group fuel channel 101 consists of for example fuel channel of 380 layouts parallel to each other, with mineralization pressure border.This pipe sealing plug is arranged on the end fitting of 380 fuel channels, acts on sealing, prevents that heavy water from leaking and the approach of the fuel of reloading to use.
Fig. 2 shows the fuel channel in one group of fuel channel shown in Fig. 1, and wherein Ref. No. 200 represents pipe sealing plug, and Ref. No. 210 represents the end fitting of pipe sealing plug.Fig. 3 is the photo of the plug of pipe sealing shown in Fig. 2 200, and wherein Ref. No. 210 represents the end fitting of pipe sealing plug.For each pipe sealing plug 200, by utilizing high temperature sonic transducer, sensor cable, prime amplifier, signal cable and signal analyzer, every fuel channel from 380 fuel channels gathers acoustical signal, carry out leak test, and the end fitting 210 of piezoelectricity sonic transducer contact pipe sealing plug 200.About more details, for example, please refer to the paper " Nondestructive Inspection of Pressure Tubes at the Pickering Nuclear Generating Station " 3 of O.A.Kupcis
rdconference on Periodic Inspection of Pressurized Components, I.Mech E., London, pp.19-25,1976.
The shortcoming of this traditional method of inspection is, for example, because therefore artificial collection signal is used the time of couplant and the cost of traverse measurement equipment long in order to check.In addition, because checker is arranged on sonic transducer pipe sealing in person beyond the Great Wall with collection signal.And the bonding force of coupling sensor is because of checker's difference difference, so be difficult to gather uniform signal.In addition, although under high temperature and radiation environment, need to test fast, because proving time is inadequate, therefore can not strictly check.
summary of the invention
The present invention designs in order to solve the problem that correlation technique exists as mentioned above, and one aspect of the present invention is to provide a kind of equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor, by this equipment being installed to the end fitting of pipe sealing plug, and the non-manual end fitting that makes sonic transducer contact this pipe sealing plug, this pipe sealing plug of this equipment automatic gauging, this equipment is installed to for adding and unload the head of the Long-distance Control refuelling machine of nuclear fuel.
According to an aspect of the present invention, provide a kind of equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor, in one end of this pipe sealing plug, there is end fitting.This equipment comprises: signal picker, contacts this end fitting; Driver, for making this signal picker contact this end fitting; Connector, for the head rod to the refuelling machine of this fuel channel by this equipment connection; And signal processor, for the treatment of the signal being gathered by this signal picker; Wherein, this signal picker comprises: contactor, contacts this end fitting; High frequency sonic transducer; All-bottom sound gathers feeler; And all-bottom sound sensor, be coupled to this all-bottom sound and gather feeler, and signal is offered to this signal processor.
This high frequency sonic transducer can be piezoelectricity sonic transducer, and this all-bottom sound sensor can be microphone sonic transducer.
This contactor can be made by latten(-tin).
This connector can be coupled to by clamp device the head rod of this refuelling machine.
This all-bottom sound sensor can be arranged in this driver.
This connector can be fixedly coupled to this driver.
Accompanying drawing explanation
According to the description of doing below in conjunction with accompanying drawing, above-mentioned and other side of the present invention, feature and advantage are apparent, wherein:
Fig. 1 is the skeleton view of the inner structure of heavy water reactor;
Fig. 2 is the structural drawing of certain fuel channel in one group of fuel channel;
Fig. 3 is the photo of actual pipe sealing plug shown in Fig. 2;
Fig. 4 is the photo of the equipment that leaks for detection of pipe sealing plug on the fuel channel in heavy water reactor according to an embodiment of the invention, and wherein, this equipment is installed in the head of refuelling machine and carries out Leak Detection;
Fig. 5 is according to the schematic diagram of the equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor of the embodiment of the present invention;
Fig. 6 is the planimetric map of driver according to an embodiment of the invention;
Fig. 7 illustrates the front elevation engaging with refuelling machine according to the equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor of the embodiment of the present invention; And
Fig. 8 is the block scheme of signal analyzer.
Embodiment
Describe below with reference to the accompanying drawings the embodiment of the present invention in detail.
Fig. 4 shows the equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor according to an embodiment of the invention, wherein, this equipment is installed on the head 607 of Long-distance Control refuelling machine, and this Long-distance Control refuelling machine is for interpolation and unload nuclear fuel.Yet, it should be noted that the present invention is not limited thereto, without departing from the present invention, those skilled in the art modifications and changes the present invention easily.
As discussed in more detail below, in order to check whether the pipe sealing plug on the fuel channel in heavy water reactor leaks, the invention provides a kind of equipment, utilize the piezoelectricity sonic transducer and the microphone sonic transducer that are all built in the individual signals collector on the end fitting that is positioned at this fuel channel, this equipment is measured the inside and outside acoustical signal from this fuel channel simultaneously, that is the high frequency elasticity acoustical signal, producing during from fuel channel internal leakage when heavy water and be delivered to outside low-frequency acoustic signal.
By convention, checker is only arranged on piezoelectricity sonic transducer pipe sealing on fuel channel beyond the Great Wall in person, to check that heavy water is whether from the internal leakage of this fuel channel.Yet, according to the present invention, owing to utilizing refuelling machine can check all fuel channels and can measure the inside and outside acoustical signal from the pipe sealing plug of this fuel channel simultaneously, thus according to equipment of the present invention can realize fast, narrow examination.
In addition, because checker is not exposed under high temperature and radiation environment, so checker is safe and can checks at run duration.In addition, by contact this pipe sealing plug in the situation that not using couplant, can improve acoustical signal receiving efficiency, thus can be more accurately, measuring-signal reliably.
By the equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor of describing in detail according to the embodiment of the present invention.
In Fig. 5, according to the equipment of the embodiment of the present invention, comprise: signal picker, driver 600, control and power supply unit 800, signal amplification unit 700, signal analysis unit 900 and for being connected to the connector of the head rod (head bar) of refuelling machine.It should be noted that for convenience of explanation, Fig. 5 is the block scheme corresponding to the equipment of photo shown in Fig. 4, and shows the side schematic view of some critical piece of this equipment.
Signal picker is a kind of acoustical signal collector, pipe sealing plug on the fuel channel of its contact examine, and comprise piezoelectricity sonic transducer and microphone sonic transducer, to measure the inside and outside acoustical signal from the pipe sealing plug on this fuel channel simultaneously.
This signal picker gathers from the inside and outside elastic wave of the pipe sealing plug 200 on this fuel channel (being acoustical signal) simultaneously, and do not consider to check environment, wherein when the inside and outside leakage of the pipe sealing plug 200 of heavy water from this fuel channel, produce described elastic wave, thereby quickly and reliably obtain check result.
The equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor will be described in detail.
Referring again to Fig. 5, this signal picker comprises sensor outer housing 400, on this sensor outer housing 400, is provided with contactor, to contact the end fitting of this fuel channel.This contactor can be made by latten(-tin) 401, with in the situation that there is no couplant, and the acoustic impedance while reducing signals collecting, thus improve acoustical signal receiving efficiency.
This signal picker comprises: high frequency sonic transducer 500, for high temperature and radial applications; Sensor cable 501, is connected to high frequency sonic transducer 500; All-bottom sound feeler 502; Conduit 503; And all-bottom sound sensor (being microphone sonic transducer) 504.
The all-bottom sound sensor 504 that is coupled to all-bottom sound collection feeler for signal is offered to signal processor can insert in this signal picker or signal amplifier 700, this signal amplifier 700 receives transducing signal by the sensor cable 501 of high frequency sonic transducer 500 and the conduit of all-bottom sound sensor 504 503, as shown in Figure 5.Yet, it should be noted that and can change according to design the arrangement of these parts.Ref. No. 402 in this figure represents spring.
According to an exemplary embodiment of the present invention, designing driver 600 is coupled to signal picker and signals collecting and amplification shell 710, as shown in the planimetric map in Fig. 6.
With reference to figure 6, driver 600 comprises: top actuating arm 601, bottom actuating arm 602, arm driven roller 603, three deflector rolls 604 and arm supporting bolts 605, so that this signal picker approaches and contacts the end fitting of this pipe sealing plug.Sensor cable 501 and acoustic conducting pipe 503 are positioned at bottom actuating arm 602.
Utilize clamp device 606, signals collecting engages (seeing Fig. 4) with amplifying shell 710 with the head rod 607 of refuelling machine, as shown in the front elevation in Fig. 7.
Be inserted into signals collecting, with the signal amplification unit 700 amplifying in shell 710, the weak acoustical signal being gathered by high frequency sonic transducer 500 and all-bottom sound sensor (microphone sonic transducer) 504 be amplified to several millivolts from several microvolts.By high frequency sound signal cable 801 and low-frequency acoustic signal cable 802, the high frequency sound signal being exaggerated and low-frequency acoustic signal are input to respectively signal analyzer 900.
Control with power supply unit 800 electric power is offered to driver 600 and signal amplifier 700.Control with power supply unit 800 and apply 12V direct current to amplify acoustical signal to signal amplifier 700, utilize 220V alternating current CD-ROM drive motor so that driver 600 moves to and fro, and to applying 12V direct current with the limit switch 404 of sensor outer housing 400 joints.Limit switch 404 further moves forward the latten(-tin) 401 engaging with spring 402 from approaching and contacting the end fitting of pipe sealing plug at latten(-tin) 401 after for preventing.
With reference to Fig. 8, signal analyzer 900 is described.
The weak acoustical signal being gathered by high frequency sonic transducer 500 and all-bottom sound sensor 504 is exaggerated device (AMP) and amplifies.The high frequency sonic transducer signal being exaggerated is imported into RMS circuit 901 average by RMS circuit 901, and the all-bottom sound sensor signal being exaggerated is imported into another RMS circuit 902 average by RMS circuit 902.
High frequency sound signal after average is applied to analog to digital converter (ADC) 903, and the low-frequency acoustic signal after average is applied to analog to digital converter (ADC) 904.Digitized low-frequency acoustic signal and high frequency sound signal are stored in the storer (RAM) 905 in calculation element 909 for example.
This calculation element for example can be determined acoustical signal level, the transducing signal gathering is carried out to voltage analysis and Fast Fourier Transform (FFT) (FFT) operation, and result is presented on display 910.
The invention provides a kind of method and apparatus for improvement of checking the conventional art of the pipe sealing plug leakage on fuel channel.Therefore, the invention provides a kind of technology that checks fast, reliably, because utilize the individual equipment that is coupled to refuelling machine to measure from the inside and outside acoustical signal of pipe sealing plug on this fuel channel simultaneously, can check easily all fuel channels.
In addition, because checker is not exposed under high temperature and radiation environment, so checker is safe and can checks at run duration.In addition, by contact pipe sealing plug in the situation that not using couplant, to improve acoustical signal receiving efficiency, thus can be more accurately, measuring-signal reliably.Therefore, the invention provides a kind of practical technique of pipe sealing being filled in to row leak test.
By convention, because using refuelling machine or acoustic inspection device, checker checks respectively 380 fuel channels, and check that a fuel channel spends approximately 10 minutes, so checker may suffer radiation problem, and inspection may spend nearly 3800 minutes completely.Yet equipment according to the present invention is arranged in existing power station on the refuelling machine in using, and this equipment of Long-distance Control, with these 380 fuel channels of rapid scanning.
In addition, by convention, the pipe sealing that checker is only arranged on piezoelectricity sonic transducer fuel channel in person beyond the Great Wall, to check that fuel channel leaks.Yet, refuelling machine inspection fuel channel due to current use in equipment utilization according to the present invention power station, and measure from the inside and outside acoustical signal of this fuel channel simultaneously, so can check fast, prevent that checker is by radiation, and prevent that heavy water from leaking from the pipe sealing plug of this fuel channel.
Although the invention provides some embodiment in order to illustrate, as explanation, provide these embodiment, and without departing from the spirit and scope of the present invention, those of ordinary skills can carry out various modifications, change and replacement.Therefore, by claims and be equal to and limit the scope of the invention.
Claims (6)
1. the equipment leaking for detection of the pipe sealing plug on the fuel channel in heavy water reactor, has end fitting in one end of described pipe sealing plug, and described equipment comprises:
Signal picker, contacts described end fitting;
Driver, for making described signal picker contact described end fitting;
Connector, for connecting the device to the head rod of the refuelling machine of described fuel channel; And signal processor, for the treatment of the signal being gathered by described signal picker;
Described signal picker comprises:
Contactor, contacts described end fitting;
High frequency sonic transducer;
All-bottom sound gathers feeler; And
All-bottom sound sensor, is coupled to described all-bottom sound and gathers feeler, signal is offered to described signal processor.
2. equipment according to claim 1, wherein, described high frequency sonic transducer is piezoelectricity sonic transducer, described all-bottom sound sensor is microphone sonic transducer.
3. equipment according to claim 1, wherein, described contactor is made by latten(-tin).
4. equipment according to claim 1, wherein, described connector is coupled to the head rod of described refuelling machine by clamp device.
5. equipment according to claim 1, wherein, described all-bottom sound sensor setting is in described driver.
6. equipment according to claim 1, wherein, described connector is fixedly coupled to described driver.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2008-0091650 | 2008-09-18 | ||
| KR1020080091650A KR100987166B1 (en) | 2008-09-18 | 2008-09-18 | Acoustic Leak Detector for Fuel Channels in Heavy Water Reactor |
| KR1020080091650 | 2008-09-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101676703A CN101676703A (en) | 2010-03-24 |
| CN101676703B true CN101676703B (en) | 2014-05-07 |
Family
ID=42029343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910171889.9A Expired - Fee Related CN101676703B (en) | 2008-09-18 | 2009-09-16 | Apparatus for detecting leakage from channel closure plug for fuel channel in heavy water reactor |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR100987166B1 (en) |
| CN (1) | CN101676703B (en) |
| AR (1) | AR073383A1 (en) |
| CA (1) | CA2673710C (en) |
| RO (1) | RO126250B1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101070322B1 (en) | 2011-05-11 | 2011-10-06 | 진흥산업 주식회사 | Testing device for static seal of candu fueling machine |
| CN103247358B (en) * | 2013-04-16 | 2015-11-25 | 中国核电工程有限公司 | Nuclear power station high energy pipeline local leakage monitoring test stand |
| KR101926956B1 (en) * | 2017-01-02 | 2018-12-07 | 한국수력원자력 주식회사 | method of Failed Feul Location Monitoring |
| CN109973826B (en) * | 2019-04-26 | 2020-05-15 | 西安交通大学 | Experimental device and method for measuring leakage rate of nuclear reactor pipeline |
| RU2709474C1 (en) * | 2019-09-04 | 2019-12-18 | Акционерное общество "Научно-технический центр "Диапром" | System of acoustic leak monitoring of npp pipeline |
| RU2722684C1 (en) * | 2019-11-15 | 2020-06-03 | Акционерное общество "Научно-технический центр "Диапром" | Monitoring system for leakage of heat exchanger of passive heat removal system by acoustic method |
| RU2756850C1 (en) * | 2021-04-05 | 2021-10-06 | Акционерное общество «Научно-технический центр «Диапром» | Moisture measuring channel |
| RU2760604C1 (en) * | 2021-04-05 | 2021-11-29 | Акционерное общество «Научно-технический центр «Диапром» | Acoustic measuring channel |
| KR20220151509A (en) | 2021-05-06 | 2022-11-15 | 한국수력원자력 주식회사 | Fuel handling system modeling method, evaluation method, and evaluation system for safety analysis of candu plant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2097938A5 (en) * | 1970-06-16 | 1972-03-03 | Gen Electric Canada | Detection of leaks - in dangerous surroundings using noise level |
| CN2166436Y (en) * | 1993-09-01 | 1994-05-25 | 东南大学 | Anti-strong noise ultrasonic leakage testing instrument |
| JP2005134357A (en) * | 2003-10-28 | 2005-05-26 | Toshiba Corp | Valve leakage detecting system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040046596A (en) * | 2002-11-28 | 2004-06-05 | 황후 | Mobile Phone Having a Mirror |
| KR200446596Y1 (en) * | 2007-09-27 | 2009-11-11 | 한국전력공사 | The Acoustic Emission Signal Acquisition Assembly for Leak Detection of Closure Plug in Heavy Water Reactor |
-
2008
- 2008-09-18 KR KR1020080091650A patent/KR100987166B1/en active IP Right Grant
-
2009
- 2009-07-23 CA CA2673710A patent/CA2673710C/en not_active Expired - Fee Related
- 2009-07-28 RO ROA200900591A patent/RO126250B1/en unknown
- 2009-09-16 CN CN200910171889.9A patent/CN101676703B/en not_active Expired - Fee Related
- 2009-09-18 AR ARP090103583A patent/AR073383A1/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2097938A5 (en) * | 1970-06-16 | 1972-03-03 | Gen Electric Canada | Detection of leaks - in dangerous surroundings using noise level |
| CA933646A (en) * | 1970-06-16 | 1973-09-11 | Canadian General Electric Company Limited | Ultrasonic leak detection |
| CN2166436Y (en) * | 1993-09-01 | 1994-05-25 | 东南大学 | Anti-strong noise ultrasonic leakage testing instrument |
| JP2005134357A (en) * | 2003-10-28 | 2005-05-26 | Toshiba Corp | Valve leakage detecting system |
Also Published As
| Publication number | Publication date |
|---|---|
| RO126250B1 (en) | 2015-10-30 |
| CA2673710A1 (en) | 2010-03-18 |
| CA2673710C (en) | 2014-01-21 |
| KR100987166B1 (en) | 2010-10-11 |
| AR073383A1 (en) | 2010-11-03 |
| CN101676703A (en) | 2010-03-24 |
| KR20100032669A (en) | 2010-03-26 |
| RO126250A2 (en) | 2011-04-29 |
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