JPH11294367A - Shielding cover of primary coolant circulating pump casing - Google Patents
Shielding cover of primary coolant circulating pump casingInfo
- Publication number
- JPH11294367A JPH11294367A JP10107703A JP10770398A JPH11294367A JP H11294367 A JPH11294367 A JP H11294367A JP 10107703 A JP10107703 A JP 10107703A JP 10770398 A JP10770398 A JP 10770398A JP H11294367 A JPH11294367 A JP H11294367A
- Authority
- JP
- Japan
- Prior art keywords
- pump casing
- lid
- primary coolant
- shielding cover
- shielding
- 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
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ポンプの分解点検
時に使用する一次冷却材循環ポンプケーシングの遮蔽ふ
たに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for a primary coolant circulation pump casing used for overhauling a pump.
【０００２】[0002]
【従来の技術】従来の技術を図２〜図６に示す。図２
は、原子炉の一次冷却材循環ポンプの構造の一例を示す
図、図３は、図２の一部拡大図、図４は、従来のポンプ
ケーシングの遮蔽ふたの一例を示す図（１）、図５は、
従来のポンプケーシングの遮蔽ふたの一例を示す図
（２）、図６は、従来のポンプケーシングの遮蔽ふたの
一例を示す図（３）である。2. Description of the Related Art A prior art is shown in FIGS. FIG.
Is a view showing an example of a structure of a primary coolant circulation pump of a nuclear reactor, FIG. 3 is a partially enlarged view of FIG. 2, and FIG. 4 is a view (1) showing an example of a shielding lid of a conventional pump casing; FIG.
FIG. 2 is a diagram illustrating an example of a shielding lid of a conventional pump casing, and FIG. 6 is a diagram (3) illustrating an example of a shielding lid of a conventional pump casing.
【０００３】図２において、ポンプケーシング１１は吸
込管１２と吐出管１３に溶接されている。１４はポンプ
の分解点検時にポンプケーシング１１から引き抜かれる
インターナル、１５はサーマルバリヤフランジで、イン
ターナル１４の一部を構成する。In FIG. 2, a pump casing 11 is welded to a suction pipe 12 and a discharge pipe 13. Reference numeral 14 denotes an internal that is pulled out of the pump casing 11 at the time of disassembly and inspection of the pump. Reference numeral 15 denotes a thermal barrier flange, which constitutes a part of the internal 14.
【０００４】１６は主フランジ、１７はモータスタンド
である。図２のＡ部分は、ポンプケーシング１１とサー
マルバリヤフランジ１５の溶接部であり、その詳細を図
３に示す。Reference numeral 16 denotes a main flange, and 17 denotes a motor stand. 2 is a welded portion between the pump casing 11 and the thermal barrier flange 15, and details thereof are shown in FIG.
【０００５】図３において、１８はガスケット、Ｄはサ
ーマルバリヤフランジ１５と嵌合するポンプケーシング
１１の内径を示す。ポンプの分解点検時にインターナル
１４が引抜かれているとき、下記目的でそれぞれの仮ふ
たが使用されている。 （１）ポンプケーシング内部への異物混入防止 （２）ポンプケーシング内部からの高放射線の遮蔽 （３）一次冷却材系統水張り時の水の流出防止 図４は、インターナル１４の吊上げ直後およびインター
ナル１４の吊込み直前に、異物混入防止用に使用され
る、人力で着脱可能な合板製仮ふた１９の設置状況を示
す。[0005] In FIG. 3, reference numeral 18 denotes a gasket, and D denotes an inner diameter of the pump casing 11 fitted to the thermal barrier flange 15. When the internal 14 is withdrawn during the overhaul of the pump, the respective temporary lids are used for the following purposes. (1) Prevention of foreign matter from entering the inside of the pump casing (2) Shielding of high radiation from inside the pump casing (3) Prevention of outflow of water when the primary coolant system is filled with water FIG. Immediately before hanging of 14, the installation state of a plywood temporary lid 19 which is used for preventing foreign matter from being mixed and which can be detached manually is shown.
【０００６】図５は、ケーシングガスケットみぞ２０の
手入れ時の仮ふたの設置状況を示す。図５において、２
１はケーシングガスケットみぞ２０が露出するように外
径寸法を決定した異物混入防止用のステンレス製仮ふた
であり、ポンプケーシング内部からの高放射線を遮蔽す
るために、ステンレス製仮蓋２１の上には多数の鉛マッ
ト２２が敷設される。FIG. 5 shows the provision of the temporary lid when the casing gasket groove 20 is maintained. In FIG. 5, 2
Reference numeral 1 denotes a stainless steel temporary lid whose outer diameter is determined so that the casing gasket groove 20 is exposed. The stainless steel temporary lid is provided on a stainless steel temporary lid 21 for shielding high radiation from inside the pump casing. A number of lead mats 22 are laid.
【０００７】図６は、インターナル１４が引抜かれてい
るとき、一次冷却材系統に水張行う場合の仮ふたの設置
状況を示す。図６において、２３はステンレス製内ふ
た、２４は炭素鋼製外ふた、２５は仮ボルト、１８はガ
スケットである。FIG. 6 shows an installation state of the temporary lid when water is filled in the primary coolant system when the internal 14 is pulled out. In FIG. 6, reference numeral 23 denotes a stainless steel inner lid, 24 denotes a carbon steel outer lid, 25 denotes a temporary bolt, and 18 denotes a gasket.
【０００８】[0008]
【発明が解決しようとする課題】従来の技術には、次の
ような問題がある。 （１）ケーシングガスケットみぞ２０の手入れ等、ポン
プケーシングの上部で作業するとき、仮ふた２１の放射
線遮蔽能力が小さい為に鉛マット２２を敷き詰めている
が、鉛マット２２の敷設時、および撤退時の作業者の被
爆量が大きく、また重労働である。 （２）ポンプケーシング内面検査時、上記鉛マット２２
と仮ふた２１を撤去しなければならないので、ポンプケ
ーシング内面検査時の作業者の被爆量が大きい。 （３）定期検査工程短縮のため、今まで運転されていた
インターナル１４を取外した後、予め点検整備されたイ
ンターナル１４を組込む工法が主流になりつつあるが、
経年的にポンプケーシング１１のサーマルバリヤとの嵌
合部（図３のＤ）が歪んでいて、そのままでは組込み出
来ないことがある。 （４）ガスケット１８のシート面の手入れ時、仮ふたの
放射線遮蔽能力が小さく、作業者の被爆量が大きい。本
発明は、これらの問題を解決することができる遮蔽ふた
を提供することを目的とする。The prior art has the following problems. (1) When working on the upper part of the pump casing, such as cleaning the casing gasket groove 20, the lead mat 22 is spread over the temporary lid 21 because the radiation shielding ability is small, but when the lead mat 22 is laid or withdrawn. Workers are exposed to heavy radiation and are hard-working. (2) When inspecting the inner surface of the pump casing, the lead mat 22
Since the temporary lid 21 must be removed, the worker is exposed to a large amount of radiation when inspecting the inner surface of the pump casing. (3) In order to shorten the periodical inspection process, the method of removing the internal 14 that has been operating up to now and incorporating the internal 14 that has been inspected and maintained in advance is becoming mainstream.
Over time, the fitting portion (D in FIG. 3) of the pump casing 11 with the thermal barrier is distorted and may not be assembled as it is. (4) When the sheet surface of the gasket 18 is cared for, the radiation shielding ability of the temporary lid is small, and the radiation exposure of the worker is large. An object of the present invention is to provide a shielding lid that can solve these problems.
【０００９】[0009]
【課題を解決するための手段】（第１の手段）本発明に
係る一次冷却材循環ポンプケーシング１１の遮蔽ふた１
は、一次冷却材循環ポンプの定期点検時にポンプケーシ
ング１１の上部のサーマルバリヤフランジ１５に載置す
る遮蔽ふた１において、（Ａ）前記遮蔽ふた１を貫通す
る着脱可能なメンテナンス用プラグ２を具備し、（Ｂ）
前記遮蔽ふた１とメンテナンス用プラグ２の上下表面は
ステンレス鋼で製作し、（Ｃ）前記遮蔽ふた１とメンテ
ナンス用プラグ２の内部には鉛を充填したことを特徴と
する。(First Means) A shielding lid 1 of a primary coolant circulation pump casing 11 according to the present invention.
(A) The shield lid 1 placed on the thermal barrier flange 15 on the upper part of the pump casing 11 at the time of periodic inspection of the primary coolant circulation pump, comprises (A) a detachable maintenance plug 2 penetrating the shield lid 1. , (B)
The upper and lower surfaces of the shield lid 1 and the maintenance plug 2 are made of stainless steel, and (C) the interior of the shield lid 1 and the maintenance plug 2 is filled with lead.
【００１０】したがって、次のように作用する。遮蔽ふ
た１は、表面がステンレス鋼３で製作され、内部に鉛４
を充填しているため、十分な放射線遮蔽能力を有する。Therefore, the operation is as follows. The shielding lid 1 has a surface made of stainless steel 3 and has lead 4 inside.
, It has a sufficient radiation shielding ability.
【００１１】上記遮蔽ふた１を貫通し、容易に着脱でき
るメンテナンス用プラグ２も、遮蔽ふた１と同様に表面
をステンレス鋼５とし、内部に鉛６を充填しているた
め、十分な放射線遮蔽能力を有する。The maintenance plug 2, which penetrates through the shielding lid 1 and can be easily attached and detached, has a surface made of stainless steel 5 and is filled with lead 6 similarly to the shielding lid 1, so that it has a sufficient radiation shielding ability. Having.
【００１２】[0012]
【発明の実施の形態】（第１の実施の形態）本発明の第
１の実施の形態に係る遮蔽ふたの構成を図１に示す。図
１において、１１はポンプケーシング、１２は吸込管、
１３は吐出管、２０はケーシングガスケットみぞであ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows the configuration of a shielding lid according to a first embodiment of the present invention. In FIG. 1, 11 is a pump casing, 12 is a suction pipe,
13 is a discharge pipe, and 20 is a casing gasket groove.
【００１３】１は遮蔽ふたで、表面はステンレス鋼３
で、内部に鉛４が充填されている。２は遮蔽ふた１を貫
通して嵌合するメンテナンス用プラグで、表面はステン
レス鋼５で、内部に鉛６が充填されている。1 is a shielding lid, the surface of which is stainless steel 3
And the inside is filled with lead 4. Reference numeral 2 denotes a maintenance plug that fits through the shielding lid 1 and has a surface made of stainless steel 5 and a lead 6 filled therein.
【００１４】７、８はアイボルト、９はタップ穴であ
り、ケーシングガスケットみぞ２０の清掃装置やポンプ
ケーシング１１の内面検査装置などの取付に用いる。遮
蔽ふた１とメンテナンス用プラグ２は、放射線に対する
十分な遮蔽能力を有する厚さで作られており、アイボル
ト７、８により容易に着脱できる。Reference numerals 7 and 8 denote eye bolts, and reference numeral 9 denotes a tapped hole, which are used for mounting a cleaning device for the casing gasket groove 20 and an inner surface inspection device for the pump casing 11. The shielding lid 1 and the maintenance plug 2 are made of a thickness having a sufficient radiation shielding ability, and can be easily attached and detached by the eyebolts 7 and 8.
【００１５】遮蔽ふた１の外径ｄｘ，ｄｙは、製作時に
正確に測定して刻印しておく。そして、ポンプケーシン
グ１１の上面に設置する時に、ｄｘ，ｄｙとポンプケー
シング１１のサーマルバリヤ嵌合部内径Ｄｘ、Ｄｙとの
隙間ｘ1 、ｘ2 （図１）、および ｙ1 、ｙ2 （図示省
略）を計測すれば、 Ｄｘ＝ｄｘ＋ｘ1 ＋ｘ2 、 Ｄｙ＝ｄｙ＋ｙ1 ＋ｙ2 、 により、Ｄｘ、Ｄｙは容易に計算されて、予備のインタ
ーナル１４をポンプケーシング１１に設置する場合の嵌
合寸法関係が予め把握でき、修正加工の要否が事前に判
断することが出来る。The outer diameters dx and dy of the shielding lid 1 are accurately measured and stamped at the time of manufacture. Then, when placed on the upper surface of the pump casing 11, dx, gap x 1 between the thermal barrier fitting inner diameter Dx, Dy of dy and the pump casing 11, x 2 (FIG. 1), and y 1, y 2 (shown by measuring the drawings), the fitting dimensions of the case dx = dx + x 1 + x 2, Dy = dy + y 1 + y 2, by, dx, Dy is that is easily calculated, installing the spare internal 14 in the pump casing 11 The relationship can be grasped in advance, and the necessity of correction processing can be determined in advance.
【００１６】[0016]
【発明の効果】本発明は前述のように構成されているの
で、以下に記載するような効果を奏する。 （１）本発明の遮蔽ふたを使用することにより、作業者
の被爆量を激減することが出来る。 （２）一次冷却材循環ポンプの点検工程を短縮すること
が出来る。 （３）原子力プラントの定期点検工期を短縮することが
出来る。 （４）予備のインターナル設置前に、インターナル設置
時の嵌合部寸法の適否が予め判定できるので、工程ロス
や無駄な被爆を解消することが出来る。Since the present invention is configured as described above, it has the following effects. (1) By using the shielding lid of the present invention, it is possible to drastically reduce the amount of exposure of workers. (2) The inspection process of the primary coolant circulation pump can be shortened. (3) Periodic inspection work of the nuclear power plant can be shortened. (4) Before the preliminary internal installation, the appropriateness of the fitting portion dimensions at the time of the internal installation can be determined in advance, so that the process loss and unnecessary exposure can be eliminated.
【図１】本発明の第１の実施の形態に係るポンプケーシ
ングの遮蔽ふたの構成図。FIG. 1 is a configuration diagram of a shielding lid of a pump casing according to a first embodiment of the present invention.
【図２】原子炉の一次冷却材循環ポンプの構造の一例を
示す図。FIG. 2 is a diagram showing an example of a structure of a primary coolant circulation pump of a nuclear reactor.
【図３】図２の一部拡大図。FIG. 3 is a partially enlarged view of FIG. 2;
【図４】従来のポンプケーシング遮蔽ふたの一例を示す
図（１）。FIG. 4 is a diagram (1) showing an example of a conventional pump casing shielding lid.
【図５】従来のポンプケーシング遮蔽ふたの一例を示す
図（２）。FIG. 5 is a diagram (2) showing an example of a conventional pump casing shielding lid.
【図６】従来のポンプケーシング遮蔽ふたの一例を示す
図（３）。FIG. 6 is a diagram (3) showing an example of a conventional pump casing shielding lid.
１ …遮蔽ふた ２ …メンテナンス用プラグ ３ …ステンレス鋼 ４ …鉛 ５ …ステンレス鋼 ６ …鉛 ７ …アイボルト ８ …タップ穴 １１…ポンプケーシング １２…吸込管 １３…吐出管 １４…インターナル １５…サーマルバリヤフランジ １６…主フランジ １７…モータスタンド １８…ガスケット １９…合板製仮ふた ２０…ケーシングガスケットみぞ ２１…ステンレス製仮ふた ２２…鉛マット ２３…ステンレス製内ふた ２４…炭素鋼製外ふた ２５…仮ボルト Ｄｘ、Ｄｙ…ポンプケーシングのサーマルバリヤ嵌合部
の内径 ｄｘ、ｄｙ…ポンプケーシングの遮蔽ふたの外径寸法 ｘ1 、ｘ2 、ｙ1 、ｙ2 …サーマルバリヤフランジ嵌合
部のすきまDESCRIPTION OF SYMBOLS 1 ... Shielding lid 2 ... Maintenance plug 3 ... Stainless steel 4 ... Lead 5 ... Stainless steel 6 ... Lead 7 ... Eyebolt 8 ... Tap hole 11 ... Pump casing 12 ... Suction pipe 13 ... Discharge pipe 14 ... Internal 15 ... Thermal barrier Flange 16 ... Main flange 17 ... Motor stand 18 ... Gasket 19 ... Temporary lid made of plywood 20 ... Case gasket groove 21 ... Temporary lid made of stainless steel 22 ... Lead mat 23 ... Inner lid made of stainless steel 24 ... Outer lid made of carbon steel 25 ... Temporary bolt dx, Dy ... inner diameter dx of the thermal barrier fitting portion of the pump casing, the outer diameter x 1 shielding lid of dy ... pump casing, x 2, y 1, y 2 ... gap thermal barrier flange fitting portion
Claims (1)
プケーシングの上部のサーマルバリヤフランジに載置す
る遮蔽ふたにおいて、（Ａ）前記遮蔽ふたを貫通する着
脱可能なメンテナンス用プラグを具備し、（Ｂ）前記遮
蔽ふたと前記メンテナンス用プラグの上下表面はステン
レス鋼で製作し、（Ｃ）前記遮蔽ふたと前記メンテナン
ス用プラグの内部には鉛を充填したことを特徴とする一
次冷却材循環ポンプケーシングの遮蔽ふた。1. A shield lid mounted on a thermal barrier flange on an upper part of a pump casing at the time of periodic inspection of a primary coolant circulation pump, comprising: (A) a detachable maintenance plug penetrating the shield lid; B) A primary coolant circulation pump casing characterized in that upper and lower surfaces of the shielding lid and the maintenance plug are made of stainless steel, and (C) lead is filled in the shielding lid and the maintenance plug. Shielding lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10770398A JP3207803B2 (en) | 1998-04-17 | 1998-04-17 | Shielding cover for primary coolant circulation pump casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10770398A JP3207803B2 (en) | 1998-04-17 | 1998-04-17 | Shielding cover for primary coolant circulation pump casing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11294367A true JPH11294367A (en) | 1999-10-26 |
| JP3207803B2 JP3207803B2 (en) | 2001-09-10 |
Family
ID=14465813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10770398A Expired - Lifetime JP3207803B2 (en) | 1998-04-17 | 1998-04-17 | Shielding cover for primary coolant circulation pump casing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3207803B2 (en) |
-
1998
- 1998-04-17 JP JP10770398A patent/JP3207803B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3207803B2 (en) | 2001-09-10 |
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