JPH0611594A - Confirmation method and device for thimble tube incore contact position - Google Patents
Confirmation method and device for thimble tube incore contact positionInfo
- Publication number
- JPH0611594A JPH0611594A JP4167438A JP16743892A JPH0611594A JP H0611594 A JPH0611594 A JP H0611594A JP 4167438 A JP4167438 A JP 4167438A JP 16743892 A JP16743892 A JP 16743892A JP H0611594 A JPH0611594 A JP H0611594A
- Authority
- JP
- Japan
- Prior art keywords
- thimble tube
- tube
- thimble
- detector
- contact position
- 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.)
- Granted
Links
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
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、特にシンブルチュ−
ブ（原子炉炉心内中性子束検出器用案内管）の炉内にお
ける周囲案内管との接触状況を確認する方法及び装置に
関する。BACKGROUND OF THE INVENTION The present invention is particularly applicable to thimble tubes.
The present invention relates to a method and an apparatus for confirming the contact state of a bu (guide tube for neutron flux detector in reactor core) with a surrounding guide tube in the reactor.
【０００２】[0002]
【従来の技術】通常の軽水冷却型原子炉において、炉心
は、燃料集合体と称する燃料棒の束を複数並べて構成さ
れる。ここで、燃料棒は、ジルコニウム基合金管に核分
裂性物質のペレットを詰めて密閉したものである。とこ
ろで、原子炉の運転状況，即ち炉心の核分裂反応の状況
は、炉心内中性子束を検出することによって把握，監視
されるが、中性子束検出器を炉心内へ原子炉容器外から
導入するためシンブルチューブと称する案内管が使用さ
れている。このシンブルチューブは、原子炉炉内構造物
の中に組み込まれた別の案内管を通り、更に炉心内にお
いて燃料集合体に組み込まれた別の案内管の中に挿入さ
れる。2. Description of the Related Art In a conventional light water cooling type nuclear reactor, a core is formed by arranging a plurality of bundles of fuel rods called a fuel assembly. Here, the fuel rod is a zirconium-based alloy tube filled with pellets of fissile material and hermetically sealed. By the way, the operating condition of the reactor, that is, the condition of the nuclear fission reaction in the core is grasped and monitored by detecting the neutron flux in the core. A guide tube called a tube is used. The thimble tube passes through another guide tube incorporated in the reactor internal structure, and is inserted into another guide tube incorporated in the fuel assembly in the core.
【０００３】従来、炉内の案内管とシンブルチュ−ブの
接触状況を確認できる手段は、全くなかった。ところ
で、シンブルチュ−ブは炉内での冷却材の流動による加
振力を受けて振動することがあり、特に接触力が弱い。
また、接触点スパンが長いと、流動による振動巾が増加
し、炉内構造物とこすれてシンブルチューブ自体が摩耗
することがある。従って、予め案内管とシンブルチュ−
ブの接触状況を知ることは、シンブルチューブを保護す
る意味で極めて重要である。Conventionally, there has been no means for confirming the contact state between the guide tube in the furnace and the thimble tube. By the way, the thimble tube may be vibrated by the exciting force due to the flow of the coolant in the furnace, and the contact force is particularly weak.
Further, if the span of the contact point is long, the vibration width due to the flow may increase, and the thimble tube itself may be worn by rubbing against the internal structure of the furnace. Therefore, the guide tube and thimble tube are
It is extremely important to know the contact status of the bush in order to protect the thimble tube.
【０００４】[0004]
１．シンブルチュ−ブは原子炉内に挿入される中性子束
検出器の案内管であり径もかなり細く、長さもかなり長
い。原子炉容器内への挿入長はシンブルチュ−ブ先端か
ら数メートルであるが、炉内構造物及び燃料内にあるた
め、外部からその接触状況を知る方法はない。 ２．シンブルチュ−ブの内径は小径であり細いため、内
部よりシンブルチュ−ブ外面の構造物との接触状況を知
る方法はない。1. The thimble tube is a guide tube for a neutron flux detector to be inserted into a nuclear reactor and has a considerably small diameter and a considerably long length. The length of insertion into the reactor vessel is a few meters from the tip of the thimble tube, but since it is inside the reactor internals and fuel, there is no way to know the contact status from the outside. 2. Since the inner diameter of the thimble tube is small and thin, there is no way to know the state of contact with the structure on the outer surface of the thimble tube from the inside.
【０００５】この発明はこうした事情を考慮してなされ
たもので、シンブルチューブ内に加速度検出器を挿入し
て炉内の任意の複数の位置での振動数を計測することに
より、炉内の案内管とシンブルチュ−ブの接触状況を正
確に確認しえるシンブルチューブ炉内接触位置の確認方
法及び装置を提供することを目的とする。The present invention has been made in consideration of such circumstances, and guides the inside of the furnace by inserting an acceleration detector into the thimble tube and measuring the frequency at arbitrary plural positions in the furnace. It is an object of the present invention to provide a method and apparatus for confirming the contact position in the thimble tube furnace, which can accurately confirm the contact condition between the tube and the thimble tube.
【０００６】[0006]
【課題を解決するための手段】本願第１の発明は、原子
力発電所用の炉内中性子計測用検出器の案内管としてシ
ンブルチュ−ブを炉心内へ挿入してシンブルチューブの
接触位置を確認する方法において、加速度検出器を前記
シンブルチューブ内へ挿入し、炉内の任意の複数の位置
で振動数を計測することを特徴とするシンブルチューブ
炉内接触位置の確認方法である。The first invention of the present application is a method for confirming the contact position of a thimble tube by inserting a thimble tube into a core as a guide tube of a detector for measuring in-core neutrons for a nuclear power plant. In the above method, the acceleration detector is inserted into the thimble tube, and the vibration frequency is measured at arbitrary plural positions in the furnace.
【０００７】本願第２の発明は、原子力発電所用の炉内
中性子計測用検出器の案内管としてシンブルチュ−ブを
炉心内へ挿入してシンブルチューブの接触位置を確認す
る装置において、前記シンブルチューブ内に移動自在に
挿入された加速度検出器と、一端が前記加速度検出器に
接続された検出器挿入用ワイヤと、このワイヤの他端に
接続され前記加速度検出器で計測された振動数を表示す
る表示手段とを具備することを特徴とするシンブルチュ
ーブ炉内接触位置の確認装置である。A second invention of the present application is an apparatus for inserting a thimble tube into a reactor core as a guide tube of a detector for measuring neutrons in a nuclear power plant and confirming a contact position of the thimble tube. An acceleration detector that is movably inserted into the sensor, a detector insertion wire whose one end is connected to the acceleration detector, and the frequency measured by the acceleration detector that is connected to the other end of the wire. A device for confirming a contact position in a thimble tube furnace, comprising: a display means.
【０００８】[0008]
【作用】この発明において、In the present invention,
【０００９】１．シンブルチュ−ブの振動発生は、炉内
構造物（計装案内管内）内軸流速とシンブルチュ−ブの
支持条件により決まる。そこで、軸流速が一定とすれ
ば、シンブルチュ−ブ自体の案内管内接触による固有振
動数の程度が明らかであれば、振動発生はおさえられる
（振動数が高ければ振動振巾は小さくなる。）1. The vibration generation of the thimble tube is determined by the axial flow velocity inside the reactor internal structure (in the instrumentation guide tube) and the supporting conditions of the thimble tube. Therefore, if the axial flow velocity is constant, the occurrence of vibration is suppressed if the degree of natural frequency due to the contact of the thimble tube itself in the guide tube is clear (the higher the frequency, the smaller the vibration amplitude).
【００１０】２．シンブルチュ−ブを炉内へ挿入した状
態で、加速度検出器をシンブルチュ−ブ内へ入れ、ポン
プを運転し流動により加振力をシンブルにあたえること
で卓越する振動数は計測可能となる。 ３．接触位置確認の方法としては加速度検出器を予め定
めた単位で位置がえし、計測することで各点卓越振動数
により、判別予測可能である。2. With the thimble tube inserted in the furnace, the acceleration detector is placed in the thimble tube, the pump is operated, and the exciting force is applied to the thimble by the flow, whereby the outstanding frequency can be measured. 3. As a method for confirming the contact position, the acceleration detector is moved in a predetermined unit, and the measured position is measured, so that it is possible to make a determination and prediction based on the dominant frequency of each point.
【００１１】[0011]
【実施例】以下、この発明の一実施例を図面を参照して
説明する。図１（Ａ），（Ｂ）は、本発明に係るシンブ
ルチューブ炉内接触位置の確認装置を示す。但し、図１
（Ｂ）は図１（Ａ）のＸ部の拡大図を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 (A) and 1 (B) show a device for confirming a contact position in a thimble tube furnace according to the present invention. However, in FIG.
(B) shows an enlarged view of the X portion of FIG.
【００１２】図中の１は検出器挿入用ワイヤ２の先端に
取り付けられた（微小型）加速度検出器を示し、後記シ
ンブルチューブ内の任意の点での振動数を計測する機能
を有している。前記検出器挿入用ワイヤ２は表示器が付
設された挿入引抜工具３によりシンブルチューブ４内へ
送り込まれ、シンブルチューブ先端の燃料集合体５まで
挿入できる構成になっている。前記検出器挿入用ワイヤ
２内のリード線（図示せず）には、このリード線からの
信号が送られる増幅器６，周波数分析器７，卓越する周
波数が出力されるプリンタ８が順次接続されている。Reference numeral 1 in the figure denotes a (small type) acceleration detector attached to the tip of the detector insertion wire 2 and has a function of measuring the frequency at an arbitrary point in the thimble tube described later. There is. The detector insertion wire 2 is fed into the thimble tube 4 by an insertion / extraction tool 3 provided with an indicator so that the fuel assembly 5 at the tip of the thimble tube can be inserted. To the lead wire (not shown) in the detector insertion wire 2, an amplifier 6 to which a signal from the lead wire is sent, a frequency analyzer 7, and a printer 8 which outputs a prominent frequency are sequentially connected. There is.
【００１３】前記燃料集合体５を炉心にもつ原子炉のオ
ペレータフロアと同じ高さにシールテーブル９があり、
このシールテーブル９からコンジットチューブ10が原子
炉容器下部壁11まで大きいＬ形を描いてのびている。こ
こで、コンジットチューブ10は、原子炉容器内の高圧冷
却材空間と外部雰囲気とを隔離し、かつシンブルチュー
ブ４を原子炉容器内へ案内するものである。There is a seal table 9 at the same height as the operator floor of a nuclear reactor having the fuel assembly 5 in the core,
A conduit tube 10 extends from the seal table 9 to the lower wall 11 of the reactor vessel in a large L shape. Here, the conduit tube 10 separates the high-pressure coolant space in the reactor vessel from the external atmosphere, and guides the thimble tube 4 into the reactor vessel.
【００１４】前記燃料集合体５は、図示しない炉心槽に
支持された下部炉心板12の上に並べられ、更に下方の下
部炉心支持板13が十字金具14を介して炉内計装案内管15
を支持する。また、図中の16は上部連接板、17は下部連
接板であり、前記炉内計装案内管15等と共に下部支持構
造物を構成する。The fuel assemblies 5 are arranged on a lower core plate 12 supported by a core tank (not shown), and a lower core support plate 13 therebelow is further provided with a cross fitting 14 to provide an in-core instrumentation guide tube 15
Support. Further, in the figure, 16 is an upper connecting plate, 17 is a lower connecting plate, and constitutes a lower supporting structure together with the in-core instrumentation guide pipe 15 and the like.
【００１５】前記原子炉容器下部壁11の内面にコンジッ
トチューブ10と整列して突設された炉心計装筒18は、炉
内計装案内管15の下端に遊嵌し、シンブルチューブ４の
挿入を担保する。通常の中性子検出時には、シンブルチ
ューブ４内に中性子束検出器が挿入される。A core instrumentation cylinder 18 projecting from the inner surface of the lower wall 11 of the reactor vessel in alignment with the conduit tube 10 is loosely fitted to the lower end of the in-core instrumentation guide tube 15 to insert the thimble tube 4. Guarantee. At the time of normal neutron detection, a neutron flux detector is inserted in the thimble tube 4.
【００１６】このように、上記確認装置は、検出器挿入
用ワイヤ２の一端に加速度検出器１を設け、前記ワイヤ
２の他端に増幅器６，周波数分析器７，プリンタ８を順
次接続させ、加速度検出器１からの振動数を表示できる
構成になっている。次に、図２（Ａ），（Ｂ）を用いて
シンブルチューブ炉内接触位置の確認方法について説明
する。As described above, in the above-mentioned confirmation device, the acceleration detector 1 is provided at one end of the detector insertion wire 2, and the amplifier 6, the frequency analyzer 7, and the printer 8 are sequentially connected to the other end of the wire 2. It is configured to be able to display the frequency from the acceleration detector 1. Next, a method of confirming the contact position in the thimble tube furnace will be described with reference to FIGS. 2 (A) and 2 (B).
【００１７】(1) ．まず、図２（Ａ）のＰ1 点まで挿入
された加速度検出器１を挿入引抜工具３によりある位置
まで引抜き（図２（Ｂ）のｘ寸法）、その点の振動数を
加速度検出器１により計測する。分析された信号はプロ
ッタに出力し、その出力中卓越振動数をその点の振動数
とする。 (2) ．上記(1) 項の操作を繰り返し定めた（ｙ）ピッチ
で試測を行なう。(1). First, the acceleration detector 1 inserted up to the point P 1 in FIG. 2A is extracted to a certain position by the insertion extraction tool 3 (x dimension in FIG. 2B), and the frequency at that point is measured by the acceleration detector 1 Measure with. The analyzed signal is output to the plotter, and the dominant frequency during the output is taken as the frequency at that point. (2). Repeat the operation in (1) above and perform a trial measurement at the defined (y) pitch.
【００１８】(3) ．繰り返し計測した部位の振動数を図
２（Ｂ）に記載し、実験で求めた振動数以上を接触点と
して評価する。これにより、接触部位が炉内構造物のど
の位置にあり、シンブルチューブ自体の最低周波数がい
くらかの判定が可能である。(3). The frequency of the repeated measurement is shown in FIG. 2 (B), and the frequency above the experimentally determined frequency is evaluated as the contact point. With this, it is possible to determine where the contact portion is in the reactor internal structure and what the lowest frequency of the thimble tube itself is.
【００１９】(4) ．シンブルチュ−ブ４を加振する流動
はＰ7 部より進入するが、その流れはＰ5 部より軸流れ
となりＰ3 部で流出する。その軸流により、シンブルチ
ュ−ブ４はその部位のもつ固有振動数で振動することに
なる。(4). The flow vibrating the thimble tube 4 enters from the P 7 part, but the flow becomes an axial flow from the P 5 part and flows out at the P 3 part. The axial flow causes the thimble tube 4 to vibrate at the natural frequency of that portion.
【００２０】このように、上述したシンブルチューブ炉
内接触位置の確認方法によれば、検出器挿入用ワイヤ２
の一端に加速度検出器１を設けた状態でシンブルチュー
ブ４内に挿入し、炉内流動による振動数を加速度検出器
１で計測するため、その接触位置及びその系がもつ固有
振動数の判定ができることにより、流動振動によるシン
ブルチューブ４の振動の有無が確認できるとともに、振
動によるシンブルチューブ４の磨耗の可能性が判別可能
となる。また、シンブルチューブ４の計測された最低振
動数が低いケースについては、再挿入による手直し（必
要によっては取りかえ）が可能となる。As described above, according to the above-mentioned method for confirming the contact position in the thimble tube furnace, the detector insertion wire 2
It is inserted into the thimble tube 4 with the acceleration detector 1 provided at one end of the, and the frequency due to the flow in the furnace is measured by the acceleration detector 1. Therefore, the contact position and the natural frequency of the system can be determined. As a result, the presence or absence of vibration of the thimble tube 4 due to flow vibration can be confirmed, and the possibility of wear of the thimble tube 4 due to vibration can be determined. Further, in the case where the measured minimum vibration frequency of the thimble tube 4 is low, it is possible to perform repair (replacement if necessary) by reinsertion.
【００２１】なお、上記実施例では、本発明をシンブル
チューブに適用した場合について述べたが、例えば外部
から接触状況を確認できない管（特に小径管）の接触状
況確認の方法としても有効であることは勿論のことであ
る。In the above embodiments, the case where the present invention is applied to the thimble tube has been described, but it is also effective as a method for confirming the contact state of a pipe (particularly a small diameter pipe) whose contact state cannot be confirmed from the outside. Of course.
【００２２】[0022]
【発明の効果】以上詳述した如くこの発明によれば、シ
ンブルチューブ内に加速度検出器を挿入して炉内の任意
の複数の位置での振動数を計測することにより、炉内の
案内管とシンブルチュ−ブの接触状況を正確に確認し
え、また振動によるシンブルチューブの摩耗の可能性が
判別可能となり、更にシンブルチュ−ブの計測された最
低振動数が低い場合は再挿入による手直しが可能なシン
ブルチューブ炉内接触位置の確認方法及び装置を提供で
きる。As described above in detail, according to the present invention, the acceleration detector is inserted in the thimble tube and the frequency of vibration at any arbitrary position in the furnace is measured. The contact state of the thimble tube and the thimble tube can be confirmed accurately, and the possibility of thimble tube wear due to vibration can be determined.In addition, if the measured minimum frequency of the thimble tube is low, it can be re-inserted for repair. It is possible to provide a simple method and apparatus for confirming the contact position in the thimble tube furnace.
【図１】この発明の一実施例に係るシンブルチューブ炉
内接触位置の確認装置の説明図であり、図１（Ａ）は全
体図、図１（Ｂ）は図１のＸ部の拡大図。FIG. 1 is an explanatory view of a device for confirming a contact position in a thimble tube furnace according to an embodiment of the present invention, FIG. 1 (A) is an overall view, and FIG. 1 (B) is an enlarged view of an X portion of FIG. .
【図２】この発明に係るシンブルチューブ炉内接触位置
の確認方法の説明図であり、図２（Ａ）はシンブルチュ
ーブの引き抜きを説明するための全体図、図２（Ｂ）は
図１の装置で計測した各部位での振動数の大小を記録し
た説明図。FIG. 2 is an explanatory view of a method for confirming the contact position in the thimble tube furnace according to the present invention, FIG. 2 (A) is an overall view for explaining the extraction of the thimble tube, and FIG. 2 (B) is that of FIG. Explanatory drawing which recorded the magnitude of the frequency in each part measured by the apparatus.
１…加速度検出器、２…検出器挿入用ワイヤ、３…挿入
引抜工具、４…シンブルチューブ、５…燃料集合体、６
…増幅器、７…周波数分析器、８…プリンタ、９…シー
ルテーブル、10…コンジットチューブ、11…原子炉容器
下部壁、12…下部炉心板、13…下部炉心支持板、14…十
字金具、15…炉内計装案内管、16…上部連接板、17…下
部連接板、18…炉心計装筒。1 ... Acceleration detector, 2 ... Detector insertion wire, 3 ... Insertion / extraction tool, 4 ... Thimble tube, 5 ... Fuel assembly, 6
... amplifier, 7 ... frequency analyzer, 8 ... printer, 9 ... seal table, 10 ... conduit tube, 11 ... reactor vessel lower wall, 12 ... lower core plate, 13 ... lower core support plate, 14 ... cross fitting, 15 … In-core instrumentation guide tube, 16… upper connecting plate, 17… lower connecting plate, 18… core instrumentation tube.
Claims (2)
器の案内管としてシンブルチュ−ブを炉心内へ挿入して
シンブルチューブの接触位置を確認する方法において、
加速度検出器を前記シンブルチューブ内へ挿入し、炉内
の任意の複数の位置で振動数を計測することを特徴とす
るシンブルチューブ炉内接触位置の確認方法。1. A method of inserting a thimble tube into a reactor core as a guide tube for a detector for measuring in-core neutrons for a nuclear power plant and confirming the contact position of the thimble tube,
A method for confirming a thimble tube in-furnace contact position, characterized in that an acceleration detector is inserted into the thimble tube, and the vibration frequency is measured at arbitrary plural positions in the furnace.
器の案内管としてシンブルチュ−ブを炉心内へ挿入して
シンブルチューブの接触位置を確認する装置において、
前記シンブルチューブ内に移動自在に挿入された加速度
検出器と、一端が前記加速度検出器に接続された検出器
挿入用ワイヤと、このワイヤの他端に接続され前記加速
度検出器で計測された振動数を表示する表示手段とを具
備することを特徴とするシンブルチューブ炉内接触位置
の確認装置。2. An apparatus for checking the contact position of a thimble tube by inserting a thimble tube into a core as a guide tube for a detector for measuring in-core neutrons for a nuclear power plant,
An acceleration detector movably inserted in the thimble tube, a detector insertion wire having one end connected to the acceleration detector, and a vibration measured by the acceleration detector connected to the other end of the wire. A device for confirming the contact position in the thimble tube furnace, comprising a display means for displaying the number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16743892A JP3174625B2 (en) | 1992-06-25 | 1992-06-25 | How to check the contact status in the thimble tube furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16743892A JP3174625B2 (en) | 1992-06-25 | 1992-06-25 | How to check the contact status in the thimble tube furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0611594A true JPH0611594A (en) | 1994-01-21 |
| JP3174625B2 JP3174625B2 (en) | 2001-06-11 |
Family
ID=15849714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16743892A Expired - Lifetime JP3174625B2 (en) | 1992-06-25 | 1992-06-25 | How to check the contact status in the thimble tube furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3174625B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014032065A (en) * | 2012-08-02 | 2014-02-20 | Shikoku Electric Power Co Inc | Thimble tube monitoring device |
| JP2015068780A (en) * | 2013-09-30 | 2015-04-13 | 三菱重工業株式会社 | Long body insertion/extraction device |
-
1992
- 1992-06-25 JP JP16743892A patent/JP3174625B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014032065A (en) * | 2012-08-02 | 2014-02-20 | Shikoku Electric Power Co Inc | Thimble tube monitoring device |
| JP2015068780A (en) * | 2013-09-30 | 2015-04-13 | 三菱重工業株式会社 | Long body insertion/extraction device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3174625B2 (en) | 2001-06-11 |
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