JPH0317320B2 - - Google Patents
Info
- Publication number
- JPH0317320B2 JPH0317320B2 JP58142244A JP14224483A JPH0317320B2 JP H0317320 B2 JPH0317320 B2 JP H0317320B2 JP 58142244 A JP58142244 A JP 58142244A JP 14224483 A JP14224483 A JP 14224483A JP H0317320 B2 JPH0317320 B2 JP H0317320B2
- Authority
- JP
- Japan
- Prior art keywords
- instrumentation
- tube
- neutron
- cooling hole
- guide pipe
- 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 - Lifetime
Links
- 238000001816 cooling Methods 0.000 claims description 32
- 238000001514 detection method Methods 0.000 claims description 15
- 210000004907 gland Anatomy 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
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)
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は原子炉内に設置される中性子検出装置
に係り、特に中性子検出装置のフランジ部に炉水
中のクラツドが沈着しないようにした中性子検出
装置に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a neutron detection device installed in a nuclear reactor, and particularly to a neutron detection device that prevents crud in reactor water from depositing on the flange portion of the neutron detection device. Regarding.
［発明の技術的背景］
原子炉炉水中には核分裂生成物、原子炉構成材
料からの放射化した微粒子及びそれらのイオン等
があり、それらのうち一般的に0.45μ以上の粒子
がクラツドと言われている。これらのクラツドは
機器の狭い間〓部分や流速の遅い滞留部分等に沈
着しやすく炉内中性子検出装置においても同様に
その下部（フランジ部）に大量のクラツドが蓄積
しやすい。そのため、フランジ部があるペデスタ
ル室は放射線量率が高く、保守、点検時において
作業能率の低下をきたしている。[Technical Background of the Invention] Nuclear reactor water contains fission products, activated particulates from reactor constituent materials, and their ions, among which particles with a size of 0.45μ or more are generally called crud. It is being said. These cruds tend to deposit in the narrow spaces of the equipment or in the slow-velocity retention areas, and a large amount of crud also tends to accumulate in the lower part (flange) of in-core neutron detection equipment. Therefore, the pedestal room where the flange part is located has a high radiation dose rate, which reduces work efficiency during maintenance and inspection.
中性子検出装置の使用状態は第１図に示す通り
で、計装案内管１は上端を原子炉圧力容器２内の
炉心支持板３に固定され、下端は原子炉圧力容器
２の下部を貫通して垂直に設けられている。そし
て、この計装案内管１内に細長い管状の中性子計
装管４が上下動自在に挿通され、この中性子計装
管４の上端が原子炉圧力容器２内の上部格子板５
に取付けられている。また、計装案内管１内の中
性子計装管４の外周には振れを防止するアツパー
リング６が固着されている。計装案内管１の下端
開口部には、第２図に拡大して示すように、径大
のフランジ７が取付けられ、中性子計装管４の下
端部はグランドシール８により、シールされてい
る。尚、符号９は下方より中性子計装管４内に挿
通される較正装置の案内管である。 The operating condition of the neutron detection device is as shown in Fig. 1. The upper end of the instrumentation guide tube 1 is fixed to the core support plate 3 in the reactor pressure vessel 2, and the lower end penetrates the lower part of the reactor pressure vessel 2. It is installed vertically. An elongated tubular neutron instrumentation tube 4 is inserted into this instrumentation guide tube 1 so as to be vertically movable, and the upper end of this neutron instrumentation tube 4 is connected to an upper grid plate in the reactor pressure vessel 2.
installed on. Further, an upper ring 6 is fixed to the outer periphery of the neutron instrumentation tube 4 within the instrumentation guide tube 1 to prevent vibration. As shown in an enlarged view in FIG. 2, a large-diameter flange 7 is attached to the lower end opening of the instrumentation guide tube 1, and the lower end of the neutron instrumentation tube 4 is sealed with a gland seal 8. . Incidentally, reference numeral 9 is a guide tube of the calibration device that is inserted into the neutron instrumentation tube 4 from below.
また、このような中性子検出装置においては、
同装置の劣化ウランを冷却するために第１図に示
すように、計装案内管１及び中性子計装管４の上
部にそれぞれ冷却孔１０，１１が設けられてお
り、炉水は計装案内管の冷却孔１０から流入し中
性子計装管の冷却孔１１を通つて中性子計装管４
内を上昇しバイパス孔１２へ抜けるようになつて
いる。尚、図中の符号１３は空気抜き孔である。 In addition, in such a neutron detection device,
In order to cool the depleted uranium in the equipment, cooling holes 10 and 11 are provided at the top of the instrumentation guide tube 1 and the neutron instrumentation tube 4, respectively, as shown in FIG. The neutron instrumentation tube 4 flows through the cooling hole 10 of the tube and passes through the cooling hole 11 of the neutron instrumentation tube.
It rises inside and exits to the bypass hole 12. Note that the reference numeral 13 in the figure is an air vent hole.
このような使用状態において、クラツドは第２
図に示すように、フランジ部の計装案内管１と中
性子計装管４との間〓および中性子計装管４内の
グランドシール８面上に沈着するが、そのクラツ
ドの流入経路は、第１図に矢印で示すように、計
装案内管の冷却孔１０から流入した炉水中のクラ
ツドが沈降するルートＡと、中性子計装管の冷却
孔１１に流入した炉水からクラツドが沈降するル
ートＢと、燃料表面等に付着したクラツドが計装
案内管１の上端開口部に沈降してくるルートＣと
が考えられる。 In such usage conditions, the cladding is
As shown in the figure, it is deposited between the instrumentation guide tube 1 and the neutron instrumentation tube 4 at the flange part and on the surface of the gland seal 8 inside the neutron instrumentation tube 4, but the inflow path of the crud is As shown by the arrows in Figure 1, there is a route A where crud in the reactor water that flows in through the cooling hole 10 of the instrumentation guide tube settles, and a route where crud settles from the reactor water that flows into the cooling hole 11 of the neutron instrumentation tube. Route B and route C in which crud adhering to the fuel surface etc. settle to the upper end opening of the instrumentation guide tube 1 are considered.
これまでに、中性子検出装置のクラツドの沈積
を防ぐ方法はいくつか提案されており、そのうち
の一つとして、計装案内管１の下部より復水タン
クの復水ポンプにより、復水を炉内圧力以上の圧
力で注入して、計装案内管１を下降しようとする
クラツドを押し上げて、クラツドの沈積を防ぐ方
法があるが、これは計装案内管１を改良して復水
系を接続しなければならず、技術的な困難さや設
備投資の必要など既設プラントへの適用はむずか
しい。また、中性子計装管１の周囲に段状スリー
ブを設けて計装案内管１と中性子計装管４との間
〓部に沈降するクラツドを除去する方法も提案さ
れているが、中性子計装管１内に沈着するクラツ
ドの除去がむずかしい上に、段状スリーブの設置
により中性子計装管４の計装案内管１への挿入及
び引き抜きに手間を要するという問題がある。 Up to now, several methods have been proposed to prevent the accumulation of crud in neutron detection equipment. One of them is to pump condensate into the reactor from the bottom of the instrumentation guide pipe 1 using a condensate pump in the condensate tank. There is a method to prevent the crud from settling by injecting it at a pressure higher than the pressure to push up the crud that is trying to descend down the instrumentation guide pipe 1, but this method involves improving the instrumentation guide pipe 1 and connecting the condensate system. However, it is difficult to apply it to existing plants due to technical difficulties and the need for capital investment. A method has also been proposed in which a stepped sleeve is provided around the neutron instrumentation tube 1 to remove crud that settles between the instrumentation guide tube 1 and the neutron instrumentation tube 4. There is a problem in that it is difficult to remove the crud deposited in the tube 1, and it takes time and effort to insert and pull out the neutron instrumentation tube 4 into and out of the instrumentation guide tube 1 due to the installation of the stepped sleeve.
［発明の目的］
本発明はかかる点に対処してなされたもので、
簡単な構造で、クラツドが沈積しにくく、かつフ
ラツシングを行なつた際に中性子計装管及び計装
案内管の壁面等に付着しているクラツドを容易に
排出させることができ、それにより保守、点検時
の作業員の被曝を低減化できる中性子検出装置を
提供することを目的とする。[Object of the invention] The present invention has been made to address the above problems, and
The simple structure makes it difficult for crud to accumulate, and when flushing is performed, crud adhering to the walls of the neutron instrumentation tube and instrumentation guide tube can be easily removed, making maintenance and maintenance easier. The purpose of the present invention is to provide a neutron detection device that can reduce the radiation exposure of workers during inspections.
［発明の概要］
すなわち本発明の中性子検出装置は、原子炉圧
力容器内の計装案内管上部に計装案内管内に原子
炉冷却水を導く案内管冷却孔を設け、案内管冷却
孔上方で計装案内管に内接するアツパーリングを
中性子計装管の外周に、およびフランジに内接す
るグランドシール部を中性子計装管の下端部に設
けて、このグランドシール部近傍に案内管冷却孔
から流入した冷却水を中性子計装管内に導く計装
管冷却孔を設け、さらに中性子計装管上部に計装
管冷却孔から流入した冷却水を管外に放出するバ
イパス孔を設けたことを特徴とするものである。[Summary of the Invention] That is, the neutron detection device of the present invention is provided with a guide pipe cooling hole for guiding reactor cooling water into the instrumentation guide pipe at the upper part of the instrumentation guide pipe in the reactor pressure vessel, and a guide pipe cooling hole is provided above the guide pipe cooling hole. An upper ring inscribed in the instrumentation guide tube is provided on the outer periphery of the neutron instrumentation tube, and a gland seal part inscribed in the flange is provided at the lower end of the neutron instrumentation tube, and a guide tube cooling hole is provided near the gland seal part. It is characterized by the provision of an instrumentation tube cooling hole that guides the cooling water that has flowed into the neutron instrumentation tube, and a bypass hole that is also provided at the top of the neutron instrumentation tube that discharges the cooling water that has flowed in from the instrumentation tube cooling hole to the outside of the tube. That is.
［発明の実施例］
以下、図面に示す一実施例を用いて本発明を詳
細に説明する。[Embodiment of the Invention] The present invention will be described in detail below using an embodiment shown in the drawings.
第３図は本発明の一実施例を示す断面図で、従
来例と同一部分については同一符号を符記してあ
る。即ち、符号１は計装案内管、３は炉心支持
板、４は中性子計装管、６はアツパーリング、７
はフランジ、８はグランドシール、１０は計装案
内管の冷却孔である。本発明においては、振れ防
止用のアツパーリング６は計装案内管１の内周と
接触するように、中性子計装管４の外周に固着さ
れており、これによつて、計装案内管１の上端開
口部より流入する、いわゆるルートＣからのクラ
ツドを防ぐことができる。 FIG. 3 is a sectional view showing one embodiment of the present invention, in which the same parts as in the conventional example are designated by the same reference numerals. That is, numeral 1 is an instrumentation guide tube, 3 is a core support plate, 4 is a neutron instrumentation tube, 6 is an upper ring, and 7 is a neutron instrumentation tube.
8 is a flange, 8 is a gland seal, and 10 is a cooling hole for the instrumentation guide tube. In the present invention, the upper ring 6 for preventing vibration is fixed to the outer periphery of the neutron instrumentation tube 4 so as to be in contact with the inner periphery of the instrumentation guide tube 1. It is possible to prevent crud from flowing in from the upper end opening of No. 1, the so-called route C.
本発明の主要な構成要素は、計装案内管１の冷
却孔１０と、中性子計装管４の冷却孔１４と、中
性子計装管４のバイパス孔１２と、冷却孔１０よ
り上方で計装案内管１に内接するアツパーリング
６と、中性子計装管４の下端部をシールしフラン
ジ７に内接するグランドシール８であり、特に従
来と異なる点は、従来の計装案内管１の冷却孔１
０とほぼ同じ高さにあつた第１図に示す中性子計
装管４の冷却孔１１をなくし、フランジ部７近傍
の従来クラツドが沈積していた位置に冷却孔１４
を設けるものである。本実施例においては、グラ
ンドシール部８に中性子計装管４内外を連通する
冷却孔１４が中性子計装管４内側に向けて先細り
のテーパ状に複数穿設されると共に、中性子計装
管４と接触するグランドシール部８の角、すなわ
ち第２図に符号１５で示すクラツドが沈積しやす
い部分が削られてまるみが形成され、かつ中性子
計装管４内のグランドシール面１６に中心部が高
い傾斜が形成されている。そして、冷却孔１４と
上方のバイパス孔１２以外には中性子計装管４に
穴は穿設されず、従来の空気抜き穴１３も閉塞さ
れている。 The main components of the present invention are the cooling hole 10 of the instrumentation guide tube 1, the cooling hole 14 of the neutron instrumentation tube 4, the bypass hole 12 of the neutron instrumentation tube 4, and the instrumentation above the cooling hole 10. An upper ring 6 inscribed in the guide tube 1 and a gland seal 8 that seals the lower end of the neutron instrumentation tube 4 and inscribed in the flange 7 are different from the conventional ones. Hole 1
The cooling hole 11 of the neutron instrumentation tube 4 shown in FIG.
It is intended to provide In this embodiment, a plurality of cooling holes 14 are formed in the gland seal portion 8 to communicate between the inside and outside of the neutron instrumentation tube 4 in a tapered shape toward the inside of the neutron instrumentation tube 4. The corners of the gland seal portion 8 that come into contact with the gland seal portion 8, that is, the portions where crud tends to accumulate as indicated by reference numeral 15 in FIG. A high slope is formed. No holes other than the cooling hole 14 and the upper bypass hole 12 are provided in the neutron instrumentation tube 4, and the conventional air vent hole 13 is also closed.
以上のように中性子検出装置を構成することに
より、計装案内管の冷却孔１０より炉水とともに
流入したクラツドはフランジ部近傍の冷却孔１４
まで炉水流に乗つて行き、テーパ状の冷却孔１４
を介して流れの速くなつた炉水とともに上昇して
バイパス孔１２より排出されるため、クラツドの
滞溜する個所がなくなり、クラツドのほとんどは
フランジ部８に沈着することはない。また、壁面
等に付着したクラツドをフラツシングする際に
も、中性子計装管の冷却孔１４より排出されるた
め、クラツドの沈着はほとんどない。 By configuring the neutron detection device as described above, the crud that has flowed in together with the reactor water from the cooling hole 10 of the instrumentation guide tube is transferred to the cooling hole 10 near the flange.
The taper-shaped cooling holes 14
Since the crud rises together with the faster-flowing reactor water and is discharged from the bypass hole 12, there are no places where the crud accumulates, and most of the crud does not settle on the flange portion 8. Further, even when flushing crud adhering to a wall surface or the like, since the crud is discharged from the cooling hole 14 of the neutron instrumentation tube, there is almost no deposit of crud.
［発明の効果］
以上の説明からも明らかなように、本発明は中
性子計装管の冷却孔の位置をフランジ部まで下
げ、クラツドの沈着を妨げるような構造とするこ
とにより、フランジ部のクラツドの沈着をなく
し、保守、点検時の作業員の被曝を大巾に低減さ
せることができる。[Effects of the Invention] As is clear from the above explanation, the present invention lowers the position of the cooling hole of the neutron instrumentation tube to the flange, and has a structure that prevents the deposition of crud, thereby reducing the amount of crud at the flange. This eliminates the deposition of radiation and greatly reduces radiation exposure for workers during maintenance and inspection.
また、本発明は何ら余分な構造を有しないた
め、設備投資の必要がなく、既存のプラントへの
適用が可能で経済的である。更に、中性子検出装
置の形状が従来とほとんど変らないため、挿入及
び引き抜き時の作業が容易である。 Furthermore, since the present invention does not have any extra structure, there is no need for capital investment, and it is economical because it can be applied to existing plants. Furthermore, since the shape of the neutron detection device is almost the same as that of the conventional one, it is easy to insert and remove the neutron detection device.
第１図は従来の中性子検出装置の一実施例を示
す縦断面図、第２図は第１図の中性子検出装置の
フランジ部を拡大して示す縦断面図、第３図は本
発明の一実施例を示す縦断面図である。
１……計装案内管、４……中性子計装管、６…
…アツパーリング、７……フランジ、８……グラ
ンドシール、１０……計装案内管の冷却孔、１４
……中性子計装管の冷却孔。
FIG. 1 is a vertical cross-sectional view showing an embodiment of a conventional neutron detection device, FIG. 2 is a vertical cross-sectional view showing an enlarged flange portion of the neutron detection device shown in FIG. 1, and FIG. FIG. 3 is a longitudinal cross-sectional view showing an example. 1...Instrumentation guide tube, 4...Neutron instrumentation tube, 6...
...Top ring, 7...Flange, 8...Gland seal, 10...Instrumentation guide tube cooling hole, 14
...Neutron instrumentation tube cooling hole.
Claims (1)
フランジに接続された計装案内管と、この計装案
内管に挿入され上下動自在に設けられた中性子計
装管とを備えた中性子検出器において、原子炉圧
力容器内の前記計装案内管上部に計装案内管内に
原子炉冷却水を導く案内管冷却孔を設け、この案
内管冷却孔より上方で前記計装案内管に内接する
アツパーリングを前記中性子計装管の外周に、お
よび前記フランジに内接するグランドシール部を
前記中性子計装管の下端部に設けて、前記グラン
ドシール部近傍に前記案内管冷却孔から流入した
冷却水を前記中性子計装管内に導く計装管冷却孔
を設け、さらに前記中性子計装管上部に前記計装
管冷却孔から流入した冷却水を管外に放出するバ
イパス孔を設けたことを特徴とする中性子検出
器。1 Neutron detection equipped with an instrumentation guide tube fixed through the reactor pressure vessel and connected to a flange at the lower end, and a neutron instrumentation tube inserted into the instrumentation guide tube and provided so as to be movable up and down. In the reactor pressure vessel, a guide pipe cooling hole is provided above the instrumentation guide pipe in the reactor pressure vessel to guide reactor cooling water into the instrumentation guide pipe, and the guide pipe cooling hole is inscribed in the instrumentation guide pipe above the guide pipe cooling hole. A heat ring is provided on the outer periphery of the neutron instrumentation tube, and a gland seal portion inscribed in the flange is provided at the lower end of the neutron instrumentation tube, so that the cooling that flows into the vicinity of the gland seal portion from the guide tube cooling hole is provided. An instrumentation tube cooling hole is provided for guiding water into the neutron instrumentation tube, and a bypass hole is further provided in the upper part of the neutron instrumentation tube for discharging cooling water that has flowed in from the instrumentation tube cooling hole to the outside of the tube. neutron detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58142244A JPS6033088A (en) | 1983-08-03 | 1983-08-03 | Detector for neutron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58142244A JPS6033088A (en) | 1983-08-03 | 1983-08-03 | Detector for neutron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6033088A JPS6033088A (en) | 1985-02-20 |
| JPH0317320B2 true JPH0317320B2 (en) | 1991-03-07 |
Family
ID=15310789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58142244A Granted JPS6033088A (en) | 1983-08-03 | 1983-08-03 | Detector for neutron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6033088A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5289600U (en) * | 1975-12-26 | 1977-07-04 |
-
1983
- 1983-08-03 JP JP58142244A patent/JPS6033088A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6033088A (en) | 1985-02-20 |
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