公开(公告)号：US12111432B2

公开(公告)日：2024-10-08

申请号：US17789545

申请日：2020-12-29

Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Inventor： Jonathan Dumazert ,  Sylvain Magne ,  Romain Coulon ,  Guillaume Laffont

IPC: G01T3/00 ,  G01N23/222 ,  G21C17/108

CPC classification number: G01T3/006 ,  G01N23/222 ,  G21C17/108

Abstract: A measuring system includes a detector having an optical waveguide including a primary dopant capable of transmuting, by neutron capture, into a stable secondary dopant that is less neutron-absorbent than the primary dopant, a moderation layer suitable for slowing down fast neutrons, and an analysis device connected to the detector. The analysis device is configured to inject, into the waveguide, an interrogation wave having a wavelength corresponding to an absorption peak of the secondary dopant, detect a response wave emitted by the waveguide, calculate, from the detected response wave, a piece of information relating to a concentration of secondary dopant in the waveguide, and, based on the information relating to the calculated concentration of secondary dopant, determine a fluence of fast neutrons during a predetermined secondary period.

公开(公告)号：US12080434B2

公开(公告)日：2024-09-03

申请号：US17099139

申请日：2020-11-16

Applicant: Westinghouse Electric Company LLC

Inventor： Michael D. Heibel ,  Robert J. Fetterman ,  Michael J. Prible ,  Jianwei Chen

IPC: G21C17/06 ,  G01T3/00 ,  G21C17/104 ,  G21C23/00 ,  G21G1/02

CPC classification number: G21C17/06 ,  G01T3/006 ,  G21C17/104 ,  G21C23/00 ,  G21G1/02

Abstract: Disclosed are a radioisotope activity surveillance system and methods. The system includes a fuel rod assembly having a plurality of nuclear fuel rods and a target assembly having a top nozzle including an orifice plate and at least one target material rod fixedly coupled to the orifice plate. The least one target material rod is slidably disposed within the fuel rod assembly. A sensing assembly defines an opening sized and configured to receive the target assembly therethrough. The sensing assembly includes a self-powered detector assembly to detect radioisotope activity of the target rod material. Also disclosed is a method for measuring a self-powered detector signal to calculate radioisotope activity of a target assembly and a method for analyzing total activity of a desired radioisotope.

公开(公告)号：US11694816B2

公开(公告)日：2023-07-04

申请号：US16149609

申请日：2018-10-02

Applicant: Framatome Inc.

Inventor： Ian Mckeag Johnson ,  Wesley Stults ,  David Roberts

IPC: G21C17/108 ,  G01T3/00 ,  G21D3/00

CPC classification number: G21C17/108 ,  G01T3/006 ,  G21D3/001

Abstract: A self-powered in-core detector arrangement for measuring flux in a nuclear reactor core includes a first in-core detector and a second in-core detector. The first in-core detector includes a first flux detecting material, a first lead wire extending longitudinally from a first axial end of the first flux detecting material, a first insulating material surrounding outer diameters of the first flux detecting material and the first lead wire and a first sheath surrounding the first insulating material. The first sheath includes a first section surrounding the first flux detecting material and a second section surrounding the first lead wire. The first section of the first sheath has a greater outer diameter than the second section of the first sheath. The second in-core detector includes a second flux detecting material, a second lead wire extending longitudinally from a first axial end of the second flux detecting material, a second insulating material surrounding outer diameters of the second flux detecting material and the second lead wire, and a second sheath surrounding the second insulating material. The second sheath includes a first section surrounding the second flux detecting material and a second section surrounding the second lead wire. The first section of the second sheath has a greater outer diameter than the second section of the second sheath. The first section of the first sheath is axially offset from the first section of the second sheath and radially aligned with the second section of second sheath.

公开(公告)号：US20230152477A1

公开(公告)日：2023-05-18

申请号：US17995387

申请日：2021-03-26

Applicant: Westinghouse Electric Company LLC

Inventor： Michael D. HEIBEL ,  Michael C. PRIBLE

IPC: G01T3/00

CPC classification number: G01T3/006

Abstract: A measuring device for measuring the activity of a specimen of a radioactive isotope is disclosed. The specimen of the radioactive isotope is contained within a capsule. The measuring device comprises an inner enclosure, a gamma-radiation sensitive self-power detector (SPD) positioned around the inner enclosure, and an outer enclosure positioned around the SPD and the inner enclosure. The inner enclosure comprises an internal cavity configured to receive the capsule containing the specimen. The inner enclosure defines a longitudinal axis. The outer enclosure secures the SPD to the inner enclosure such that the SPD does not move during operation and storage of the measuring device.

公开(公告)号：US4381451A

公开(公告)日：1983-04-26

申请号：US204139

申请日：1980-11-05

Applicant: Cheng L. Chen ,  Norman P. Goldstein ,  William H. Todt

Inventor： Cheng L. Chen ,  Norman P. Goldstein ,  William H. Todt

IPC: G01T3/00 ,  G21C17/12

CPC classification number: G01T3/006

Abstract: A self-powered neutron detector in which two electrically isolated emitter electrodes are provided. The emitters are formed of different materials having differing responses to thermal and epithermal neutron flux. The separate signals generated between the separate emitters and a common collector electrode are used to determine the respective thermal and epithermal neutron fluxes for a more accurate flux mapping of the reactor core.

Abstract translation: 一种自供电中子检测器，其中提供两个电隔离的发射极。 发射体由对热和超热中子通量具有不同响应的不同材料形成。 在单独的发射器和公共集电极之间产生的单独信号用于确定相应的热和超热中子通量，以便更准确地反应堆核心的通量映射。

公开(公告)号：US4345111A

公开(公告)日：1982-08-17

申请号：US167671

申请日：1980-07-11

Applicant: Hubert Petitcolas

Inventor： Hubert Petitcolas

IPC: G01T3/00 ,  H01B11/18 ,  H01B7/18

CPC classification number: G01T3/006 ,  H01B11/18

Abstract: Electrical conducting cable which is insensitive to nuclear radiation comprising at least one conductive core, at least one layer of an insulating substance surrounding said conductive core and at least one conductive sheath surrounding said insulating layer, wherein the diameter .phi..sub.D of the sheath, the diameter .phi..sub.B of the conductive core, the diameter of .phi..sub.C of the insulating layer are linked by the equation: ##EQU1## F.sub.1 representing the .beta..sup.- radiation fraction from the core reaching the sheath, F.sub.2 representing the .beta..sup.- radiation fraction from the sheath which reaches the core, the insulating substance being constituted by a mixture of at least two metal oxides.

Abstract translation: 对核辐射不敏感的导电电缆包括至少一个导电芯，围绕所述导电芯的绝缘物质的至少一层和围绕所述绝缘层的至少一个导电护套，其中护套的直径φD，直径 导电芯的phi B，绝缘层的phi C的直径通过以下等式连接：表示从芯到达护套的β-辐射分数的F1，F2代表来自鞘的β辐射分数 到达核心，绝缘物质由至少两种金属氧化物的混合物构成。

公开(公告)号：US4284893A

公开(公告)日：1981-08-18

申请号：US21481

申请日：1979-03-19

Applicant: Colin J. Allan ,  Ross B. Shields ,  Jerry M. Cuttler ,  Gerard F. Lynch

Inventor： Colin J. Allan ,  Ross B. Shields ,  Jerry M. Cuttler ,  Gerard F. Lynch

IPC: G01T1/24 ,  G01T3/00

CPC classification number: G01T3/006

Abstract: A self-powered neutron and gamma-ray flux detector is provided wherein the emitter comprises an emitter core of at least one material selected from nickel, iron, titanium and alloys based on these metals, and an emitter outer layer around the core which has a thickness in the range of the order of 0.03 mm to of the order of 0.062 mm and which is of at least one material selected from platinum, tantalum, osmium, molybdenum and cerium. With this construction, by increasing the emitter diameter beyond the optimum for a solid platinum emitter, the ratio of neutron to gamma-ray sensitivity, and hence the prompt response fraction, is increased while an acceptably small burnup rate is maintained. Larger diameter emitters of this construction have response characteristics that closely match those required for a fuel power detector in, for example, heavy-water-moderated, natural-uranium power reactors. The emitter core is preferably of Inconel (Trademark) and the emitter jacket is preferably of platinum.

Abstract translation: 提供了一种自供电的中子和伽马射线通量检测器，其中发射器包括选自镍，铁，钛的至少一种材料的发射极芯和基于这些金属的合金，以及围绕芯的发射体外层，其具有 厚度在0.03mm至0.062mm量级的范围内，并且是选自铂，钽，锇，钼和铈中的至少一种材料。 通过这种结构，通过增加发射极直径超过固体铂发射体的最佳值，中子与伽马射线灵敏度的比率以及因此的迅速响应分数增加，同时保持可接受的小的燃耗率。 这种结构的较大直径的发射器具有与例如重水缓和天然铀动力反应堆中的燃料功率检测器所需的响应特性相匹配的响应特性。 发射极芯优选为Inconel（商标），并且发射极护套优选为铂。

公开(公告)号：US3987305A

公开(公告)日：1976-10-19

申请号：US585628

申请日：1975-06-10

Applicant: Raine M. Gilbert

Inventor： Raine M. Gilbert

IPC: G01T3/00 ,  G01T1/18

CPC classification number: G01T3/006

Abstract: A parallel-plate variable-gap diode is described which is used to detect Xnd gamma radiation pulses. The collector of the diode is comprised of an interior circular portion and a concentric external annular portion, the collecting surfaces of which are coplanar and noncontiguous. A shielded low-inductance resistor-ring shunts the bulk of the sampled current back through the annular portion of the collector to the emitter thereby reducing self-bias effects. The central location and relatively small size of the current sampler minimize the perturbing influence of the walls at the periphery of the cavity. A one-dimensional electron transport analysis can therefore provide the link between the incident radiation and the observed current response of the diode. The cylindrical walls of the cavity are interchangeable spacers which permit the variation of separation between emitter and collector.

Abstract translation: 描述了用于检测X和γ辐射脉冲的平行板可变间隙二极管。 二极管的集电极包括内部圆形部分和同心外部环形部分，其收集表面是共面且不连续的。 屏蔽低电感电阻环通过集电极的环形部分将采样电流的大部分分流回到发射极，从而减少自偏压效应。 当前采样器的中心位置和相对较小的尺寸使得腔体周围的壁的扰动影响最小化。 因此，一维电子传输分析可以提供入射辐射与二极管观察到的电流响应之间的联系。 空腔的圆柱形壁是可互换的间隔件，其允许发射器和收集器之间的间隔的变化。

公开(公告)号：US3982131A

公开(公告)日：1976-09-21

申请号：US604115

申请日：1975-08-13

Applicant: Pierre Haller

Inventor： Pierre Haller

IPC: G01T3/00 ,  G21C17/108

CPC classification number: G01T3/006 ,  G21C17/108

Abstract: In a neutron detector connected by a cable with a current amplifier for the signal based on (n,e)-processes, any change in the insulation resistance of the cable is monitored by means of an a-c voltage which is superimposed on the offset voltage of the amplifier. The resistance-dependent a-c variable at the output of the amplifier, is used to make a limit indicator respond via a connected filter. The invention is of importance particularly for monitoring the internal core instrumentation of pressurized-water reactors.

Abstract translation: 在具有电流放大器的电缆与基于（n，e）工艺的信号连接的中子探测器中，电缆的绝缘电阻的任何变化通过交流电压来监测，该交流电压叠加在 放大器。 放大器输出端的电阻依赖a-c变量用于通过连接的滤波器使极限指示器响应。 本发明对于监测加压水反应堆的内部核心仪器尤其重要。

公开(公告)号：US3940627A

公开(公告)日：1976-02-24

申请号：US493904

申请日：1974-08-01

Applicant: Erich Klar

Inventor： Erich Klar

IPC: G01T3/00

CPC classification number: G01T3/006

Abstract: A self-powered neutron detector has a neutron-sensitive emitter, a collector enclosing this emitter and insulation between these two components. When irradiated by neutrons, the emitter generates Compton electrons so that a current is produced between the emitter and electrode and which may be used with a current-measuring device to provide a readout. The emitter is enclosed and electrically connected with a metal which is substantially neutron-insensitive so that the detector provides a substantially true and prompt signal accurately reflecting the neutron flux density received by the detector.

Abstract translation: 自供电的中子探测器具有中子敏感的发射极，封闭发射极的集电极和这两个部件之间的绝缘。 当被中子照射时，发射器产生康普顿电子，使得在发射极和电极之间产生电流并且可以与电流测量装置一起使用以提供读数。 发射极被封闭并与基本上是中子不敏感的金属电连接，使得检测器提供准确反映检测器所接收的中子通量密度的基本上真实和迅速的信号。