CN1159726C - Determining method and device for reactor core of spherical-bed high-temperature gas-cooled reactor - Google Patents
Determining method and device for reactor core of spherical-bed high-temperature gas-cooled reactor Download PDFInfo
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- CN1159726C CN1159726C CNB021214352A CN02121435A CN1159726C CN 1159726 C CN1159726 C CN 1159726C CN B021214352 A CNB021214352 A CN B021214352A CN 02121435 A CN02121435 A CN 02121435A CN 1159726 C CN1159726 C CN 1159726C
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- 238000000034 method Methods 0.000 title abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000004907 flux Effects 0.000 claims abstract description 7
- 230000005251 gamma ray Effects 0.000 claims abstract description 3
- 239000011324 bead Substances 0.000 claims description 35
- 238000005259 measurement Methods 0.000 claims description 20
- 238000002955 isolation Methods 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000004913 activation Effects 0.000 claims description 5
- 238000003556 assay Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000008188 pellet Substances 0.000 abstract 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910002804 graphite Inorganic materials 0.000 description 13
- 239000010439 graphite Substances 0.000 description 13
- 239000000446 fuel Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 3
- 239000001307 helium Substances 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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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- Measurement Of Radiation (AREA)
Abstract
The present invention relates to a method and a device for measuring two-region reactor cores of pebble bed type high-temperature air-cooled reactors, which belongs to the field of nuclear reactors. In the method, a string of detection pellets are blown above a two-region pebble bed reactor core through a pellet conveying pipe in a pneumatic conveying mode, detection pellets are activated after irradiation of reactor core bore diameter neutrons for a certain time, and the detection pellets are conveyed outside reactors by utilizing air-flow differential pressure; the activated radioactivity of the detection pellets is orderly measured by a gamma ray measuring device, so that the radial neutron flux distribution of the two-region reactor core is measured to confirm the radius of the interface of the two-region reactor core. The present invention has the advantages that the flux distribution of two-region reactor cores can be measured by irradiation at any time, the radius of two-region interfaces can be confirmed, the geometrical arrangement of two regions can be kept stable by the adjustment of the two-region pellet placing speed, and irradiation detection can be carried out under low power; the present invention also has the advantages of simple structure and convenient maintenance and operation.
Description
Technical field
The invention belongs to nuclear reactor field, relate in particular to the mensuration of spherical-bed high temperature gas cooled reactor two-zoned-core interface radius.
Background technology
In order to improve the power output of pebble bed reactor, pebble bed core is designed to the layout of two-region, and the center is not for containing the spherical graphite element sphere bed of fuel, and the periphery is the spheric fuel element ball bed of annular, surrounds for fixing graphite reflector all around.Graphite component is packed into by the dress ball hole at graphite nodule bed top, and fuel element is packed into by equally distributed dress ball hole on the circumference in annular fuel ball bed top, forms the two-region pebble bed core of stablizing streamline on whole vertical height.Graphite component and fuel element draw off by the ball hole of unloading of bottom centre.Distinguished through the burnup measurement measurement device by unloading graphite component and the fuel element that the ball hole draws off, more respectively by the dress ball hole at top pack into the graphite nodule bed of center and the fuel sphere bed of annular.
The size of boundary radius is subjected to the influence of top, two districts dress ball speed between graphite nodule bed and the annular fuel ball bed, if the dress ball excessive velocities of center graphite nodule, its boundary radius is just big, otherwise the dress ball speed of center slows down, and its boundary radius just dwindles.Because the friction factor of graphite is temperature variant, than much bigger under air atmosphere, even under the constant condition of two-region dress ball speed, the different atmosphere condition also can be change with boundary radius different operating conditions under under helium atmosphere.Therefore, need in the reactor operation process, be measured,, be kept the radius at stable interface, two-region and stable operating condition to regulate the dress ball speed at top, two districts to two-zoned-core boundary radius.
The notion of spherical-bed high temperature gas cooled reactor two-zoned-core with the carrying out of South Africa ball bed modular reactor plant project, just entered the research of engineering in recent years, did not see article or patent that relevant two-zoned-core interface radius is measured so far as yet.
Summary of the invention
The purpose of this invention is to provide a kind of method and device of measuring reactor core of spherical-bed high-temperature gas-cooled reactor.
The matrix material of graphite nodule and fuel sphere is graphite, and diameter is all 6cm, can not be distinguished with the way of machinery.Therefore, measuring the neutron flux distribution at the reactor core upper surface along the two-zoned-core radial direction is a kind of feasible solution of measuring two-zoned-core boundary radius.Because the high temperature gas cooled reactor reactor core is in very high running temperature, the inlet helium temperature is 250-500 ℃, and the outlet helium temperature is 700-950 ℃, and general neutron detector is difficult to bear so high work.
Method of the present invention is: the mode of utilizing strength to carry, a string detection bead is blown into the top of two-region pebble bed core from the pipe of losing, in reactor core, after the irradiation of neutron certain hour, be activated, utilize air-flow differential will survey bead again and be transported to out-pile, with the gamma-ray measurement device radioactivity of surveying the bead activation is measured one by one, measure two-zoned-core neutron flux radially with this and distribute, determine the radius of two-zoned-core interface.
Advantage of the present invention is:
1. can carry out irradiation to the Flux Distribution of two-zoned-core at any time and measure, determine the interface radius of two-region, the adjusting by two-region dress ball speed keeps the stable geometric arrangement in two-region.
2. simple in structure, maintenance operation is convenient.
3. can carry out irradiation under power surveys.
Description of drawings
Fig. 1 is a measurement mechanism structural representation of the present invention
Embodiment
Measurement mechanism (see figure 1) of the present invention is made up of a string detection bead 1, irradiation section 2, the pipe 3 of losing, measuring section 4, mistake ball isolation valve 5, draft tube 9, air-flow isolation valve 10, high-pressure air source 11, low-pressure gas source 12, Displacement Measurement mechanism 7, measurement collimation passage 6, probing device 8 and bell housing 13 etc.
The pipe 3 of losing is a pipe (see figure 1), left end passed through ball isolation valve 5 and linked to each other with irradiation section 2 pipes, right-hand member links to each other with measuring section 4 pipes, measuring section 4 circular tube external walls have ring shielding cover 13, bell housing 13 lower ends are provided with collimation passage 6, and the right-hand member of collimation passage 6 is settled γ measurement mechanism 8, and the bottom of collimation passage 6 is provided with Displacement Measurement device 7 around the outer wall of measuring section 4 pipes, the lower end of measuring section 4 pipes is by air-flow isolation valve 10 and high-pressure air source 11, and low-pressure gas source 12 links to each other.
Measuring process is as follows:
Open high-pressure air source, will survey bead and be blown in the heap, and utilize pressure differential will survey the left end that bead is pressed against irradiation section 2, the location during with assurance irradiation.Open low-pressure gas source behind the irradiation certain hour, to survey bead output out-pile, drop in the Displacement Measurement mechanism 7, survey bead this moment over against measuring collimation passage 6, sniffer 8 can record this radioactive activity intensity of surveying bead, and after measurement finished, traverse measurement displacement mechanism 7 made another bead collimate passage to locating tab assembly, can be measured one by one surveying bead, and the location when guaranteeing to measure.Activity intensity according to a string detection bead of measuring distributes, and in addition the correction of fall time can calculate two-zoned-core neutron flux radially to distribute, and determines the radius at two-zoned-core interface.
Surveying bead is matrix material with graphite or aluminium oxide, and wherein having mixed to be the material of neutron activation, and diameter is 10-50mm.
Above two-zoned-core, irradiation section 2 is horizontally disposed with along diametric(al), is the metal tube of high temperature resistant (allow working temperature 〉=500 ℃).Its medial extremity surpasses interface, two-region 25-50cm at least to the center extension, and medial extremity is welded with a termination, and the center, termination has a through hole, as carrying the gas channel of surveying bead.The pipe 3 of losing passes outside the reactor vessel, be connected with two and cross ball isolation valve 5, survey bead enter in the heap and the process of discharge out-pile in, crossing the ball isolation valve opens, can allow it pass through, close otherwise cross the ball isolation valve, play the effect of first, second road safety isolating valve on a circuit pressure border.Cross the ball isolation valve pipe of losing afterwards, connect a vertical pipe of losing after upwards promoting certain height, the height of this lifting is used for the kinetic energy of absorbing detection bead at course of conveying, speed when the detection bead is peaked approaches zero, the impact when falling into detecting location to reduce the detection bead.
Survey bead in vertical tube from the top platform of the Displacement Measurement mechanism 7 that drops into bottom measuring section 4, top platform is provided with snubber assembly, surveys the impact that bead falls to reduce.Tail end at the pipe of losing is connected with draft tube 9 and air-flow isolation valve 10, the air-flow control that is used to survey the bead input and discharges.
Be input to the reactor core top in order to survey bead, open the isolation valve of high pressure draught, by means of the pressure differential between the pressure in the pressure of high pressure draught and a loop, air-flow is entered by high-pressure air source, the detection bead that the pressure differential that its air-flow forms will leave in the measuring section is input in the irradiation section 2 on reactor core top, and air-flow is discharged from the air-flow through hole of the pipe reactor core end of losing, and keeps certain airshed, make detection bead string be pressed in the top, termination, in the irradiation process, keep stable location.
After irradiation is intact, close the high pressure draught isolation valve, open the low-pressure air current isolation valve, the pressure of low-pressure air current is lower than a circuit pressure, with the pressure reduction between a loop and the low-pressure air current, detection bead string after the irradiation is blown out out-pile, fall into and be deposited in the measuring section 4, be the screen layer encirclement around the measuring section 4, the gamma-rays of the detection bead that activates behind the irradiation is shielded, reduce the background level of surveying, be provided with a collimating aperture road 6 at the intermediate altitude place.The gamma-rays that activation detection bead produces enters the γ measurement mechanism of tail end after the collimation duct.
Displacement mechanism is in the upper end when initial, makes the center of surveying bead in the measuring section bottom just in time aim at the center in collimation duct.After treating that a radioactivation strength level measurement of surveying bead is finished, the control bit moving mechanism moves down a height of surveying little bulb diameter, allow second centrally aligned of surveying bead collimate the duct, go down according to this, measure whole detection beads always.
The selection of activating substance is mainly considered: (1) neutron-absorption cross-section is big, more than (2) a few minutes half life period, is unlikely to the too fast decay of activation radioactivity in detection process.In table 1, list selectable main activating substance.
The alternative activating substance of table 1.
Nucleic thermal cross section (crust) resonance absorption cross section (crust) half life period
I
n 115 202 2640 54min
E
u 153 390 950 16yr
T
u 181 21 590 115d
R
e 185 112 1160 90.14hr
R
e 187 74 305 17hr
A
u 197 99 1558 2.7d
Claims (2)
1. the assay method of a reactor core of spherical-bed high-temperature gas-cooled reactor, it is characterized in that utilizing the mode of strength conveying, a string detection bead is blown into the top of two-region pebble bed core from the pipe of losing, in reactor core, after the irradiation of neutron certain hour, be activated, utilize air-flow differential will survey bead again and be transported to out-pile, with the gamma-ray measurement device radioactivity of surveying the bead activation is measured one by one, measure two-zoned-core neutron flux radially with this and distribute, determine the radius of two-zoned-core interface.
2. the determinator of a reactor core of spherical-bed high-temperature gas-cooled reactor, it is characterized in that this device is by a string detection bead, the irradiation section, delivery pipe, measuring section, cross the ball isolation valve, draft tube, the air-flow isolation valve, high-pressure air source, low-pressure gas source, Displacement Measurement mechanism, measure the collimation passage, measurement mechanism and bell housing are formed, the Guan Weiyi pipe of losing, left end passed through the ball isolation valve and linked to each other with irradiation section pipe, right-hand member links to each other with the measuring section pipe, the measuring section circular tube external wall has the ring shielding cover, the bell housing lower end is provided with the collimation passage, the right-hand member of collimation passage is settled the γ measurement mechanism, the bottom of collimation passage is provided with the Displacement Measurement device around the outer wall of measuring section pipe, the lower end of measuring section pipe is by air-flow isolation valve and high-pressure air source, and low-pressure gas source links to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021214352A CN1159726C (en) | 2002-06-21 | 2002-06-21 | Determining method and device for reactor core of spherical-bed high-temperature gas-cooled reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021214352A CN1159726C (en) | 2002-06-21 | 2002-06-21 | Determining method and device for reactor core of spherical-bed high-temperature gas-cooled reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1384507A CN1384507A (en) | 2002-12-11 |
| CN1159726C true CN1159726C (en) | 2004-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021214352A Expired - Fee Related CN1159726C (en) | 2002-06-21 | 2002-06-21 | Determining method and device for reactor core of spherical-bed high-temperature gas-cooled reactor |
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| Country | Link |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296939C (en) * | 2005-08-26 | 2007-01-24 | 田嘉夫 | Regular bed modular high temperature gas cooled reactor and its fuel sphere disposal method |
| CN102496394B (en) * | 2011-11-30 | 2014-09-03 | 清华大学 | Spherical component identifier |
| DE102012216621B4 (en) * | 2012-09-18 | 2014-09-25 | Areva Gmbh | Ball measuring system with a device for introducing a lubricant into a ball tube |
| CN106128539B (en) * | 2016-08-30 | 2019-01-22 | 中广核研究院有限公司 | A kind of system producing medical short-lived phase radioactive source using pressurized-water reactor nuclear power plant |
| WO2020233814A1 (en) * | 2019-05-23 | 2020-11-26 | Framatome Gmbh | System and method for removing irradiation targets from a nuclear reactor and radionuclide generation system |
| CN114373560B (en) * | 2021-12-16 | 2023-05-16 | 华能核能技术研究院有限公司 | Modular high-temperature gas cooled reactor internal power detection model |
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2002
- 2002-06-21 CN CNB021214352A patent/CN1159726C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1384507A (en) | 2002-12-11 |
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