JPH0546919B2 - - Google Patents
Info
- Publication number
- JPH0546919B2 JPH0546919B2 JP61052221A JP5222186A JPH0546919B2 JP H0546919 B2 JPH0546919 B2 JP H0546919B2 JP 61052221 A JP61052221 A JP 61052221A JP 5222186 A JP5222186 A JP 5222186A JP H0546919 B2 JPH0546919 B2 JP H0546919B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure turbine
- shielding
- shielding structure
- partition plate
- radiation
- 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 - Fee Related
Links
- 238000005192 partition Methods 0.000 claims description 16
- 230000005855 radiation Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000002285 radioactive effect Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 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
-
- 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
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、沸騰水型原子力発電設備の高圧ター
ビンの遮蔽構造に係り、特に遮蔽構造の重量低
減、保守作業性の向上、及び一般公衆の被ばくの
低減に好適な高圧タービンの遮蔽構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shielding structure for a high-pressure turbine of a boiling water nuclear power generation facility. The present invention relates to a high-pressure turbine shielding structure suitable for reducing radiation exposure.
現行の沸騰水型原子力発電設備の高圧タービン
は、原子炉から発生した蒸気を直接駆動用として
用いるため、放射線被ばく低減の目的から遮蔽体
を設置している。従来の装置は、特開昭58−
60290号公報に記載のように箱形の鉄板遮蔽体と
なつていた。第３図は従来の沸騰水型原子力発電
設備における高圧タービンの遮蔽構造を示したも
のである。高圧タービン１と高圧タービン入口配
管２からの放射線を遮蔽するために、鉄板遮蔽体
３により、高圧タービン１と高圧タービン入口配
管２を囲んである。鉄板遮蔽体３はタービン軸を
含みタービン床面に垂直な平面により２分割でき
る構造で、運転中は、フランジ４をボルトで固定
し一体化している。これは、定検時、高圧タービ
ンを開放するために鉄板遮蔽体３を取りはずす際
の作業性を考慮し、100トン前後の天井クレーン
でも作業可能とするためである。
The high-pressure turbines of current boiling water nuclear power generation facilities use steam generated from the nuclear reactor for direct drive, so shields are installed to reduce radiation exposure. The conventional device was developed in Japanese Patent Application Laid-open No. 1983-
As described in Publication No. 60290, it was a box-shaped iron plate shield. FIG. 3 shows a shielding structure for a high-pressure turbine in a conventional boiling water nuclear power generation facility. In order to shield radiation from the high-pressure turbine 1 and the high-pressure turbine inlet pipe 2, the high-pressure turbine 1 and the high-pressure turbine inlet pipe 2 are surrounded by a steel plate shield 3. The iron plate shield 3 includes the turbine shaft and has a structure that can be divided into two by a plane perpendicular to the turbine floor surface, and during operation, the flange 4 is fixed with bolts and is integrated. This is done in consideration of workability when removing the steel plate shield 3 to open the high-pressure turbine during periodic inspections, and allows for work to be done with an overhead crane of around 100 tons.
1100MWe級の原子力プラントのタービン廻り
鉄板遮蔽体３の遮蔽厚は側壁約13cm、天井約1.6
cmとなつている。 The shielding thickness of the iron plate shield 3 around the turbine of a 1100 MWe class nuclear power plant is approximately 13 cm on the side walls and approximately 1.6 cm on the ceiling.
cm.
上に述べたような従来の鉄板遮蔽体では、少な
くとも側壁の遮蔽体を一様に厚くしているから非
常に重く、タービン架台を強化する必要があり、
また天井部のたわみ防止のために構造補強材５も
太くして数を増さなければならない。
With the conventional iron plate shield as described above, the shield at least on the side walls is uniformly thick, making it extremely heavy and requiring the turbine mount to be strengthened.
Furthermore, in order to prevent the ceiling from deflecting, the number of structural reinforcement members 5 must also be increased.
このように鉄板遮蔽体３の重量が増加すると、
天井クレーンで取り外す場合、100トン前後の天
井クレーンが使えず、作業性、操作性が悪かつ
た。 When the weight of the iron plate shield 3 increases in this way,
When removing it using an overhead crane, an overhead crane weighing around 100 tons could not be used, resulting in poor workability and operability.
そこで、近年の増設プラントや新設プラントで
は、設計合理化により遮蔽体物量を削減する要求
がある。 Therefore, in recent years, in expansion plants and new plants, there is a demand for reducing the amount of shielding materials by rationalizing the design.
一方、サイト敷地が狭隘化し、あるいは人口の
多い地域に近接して建設するような傾向にもある
ことから、一般公衆の被ばく線量が増加するのを
防止するために、タービン廻りの機器や配管に対
し遮蔽を強化しなければならない状況にある。 On the other hand, as site sites tend to become smaller or are constructed closer to populated areas, equipment and piping around the turbines must be We are now in a situation where we have to strengthen our shielding.
本発明の目的は、遮蔽構造物重量を低減し、作
業性を向上させ、しかも被ばくも低減させること
が可能な高圧タービンの遮蔽構造を提供すること
である。 An object of the present invention is to provide a shielding structure for a high-pressure turbine that can reduce the weight of the shielding structure, improve workability, and reduce radiation exposure.
本発明は、上記目的を達成するため、原子炉で
発生した放射性蒸気を用いる高圧タービンとその
蒸気を高圧タービンに導く高圧タービン入口配管
とからの放射線を鉄板の箱で遮蔽する高圧タービ
ンの遮蔽構造において、高圧タービン本体より線
量が高い高圧タービン入口配管を取囲む厚い仕切
り板を箱の天井から床まで設け、他の部分の板を
高圧タービン本体の線量に合せて仕切り板より薄
い板で形成した構成とする。
In order to achieve the above object, the present invention has a shielding structure for a high-pressure turbine that uses an iron plate box to shield radiation from a high-pressure turbine that uses radioactive steam generated in a nuclear reactor and a high-pressure turbine inlet pipe that guides the steam to the high-pressure turbine. A thick partition plate was installed from the ceiling to the floor of the box to surround the high-pressure turbine inlet piping, which has a higher radiation dose than the high-pressure turbine main body, and the other parts were made of thinner plates than the partition plate to match the radiation dose of the high-pressure turbine main body. composition.
〔作用〕
高圧タービンの遮蔽構造物は、タービンに関連
する機器や配管のうち、主に高圧タービン本体と
高圧タービン入口配管からの放射線の遮蔽を目的
としている。タービンに関連する他の機器や配管
からの放射線寄与と比べると、高圧タービン本体
と高圧タービン入口配管からの寄与が大きい。そ
の中で、高圧タービン本体と高圧タービン入口配
管からの線量率寄与をみると、高圧タービン入口
配管の方が支配的である。[Function] The purpose of the high-pressure turbine shielding structure is to mainly shield radiation from the high-pressure turbine body and the high-pressure turbine inlet piping among the equipment and piping related to the turbine. Compared to the radiation contribution from other equipment and piping related to the turbine, the contribution from the high-pressure turbine body and the high-pressure turbine inlet piping is large. Among them, when looking at the dose rate contribution from the high-pressure turbine main body and the high-pressure turbine inlet piping, the high-pressure turbine inlet piping is dominant.
従来の高圧タービンの遮蔽構造では、側壁厚さ
は一律に高圧タービン入口配管からの寄与で決め
られている。被ばく低減のために遮蔽対策を強化
しようとする場合、一律の遮蔽厚が厚くなり、遮
蔽構造物重量が増加してしまうことになる。重量
増加に伴つて、構造物の補強強化も必要となる。 In conventional high-pressure turbine shielding structures, the side wall thickness is uniformly determined by the contribution from the high-pressure turbine inlet piping. When trying to strengthen shielding measures to reduce exposure, the uniform shielding thickness becomes thicker, and the weight of the shielding structure increases. As the weight increases, the reinforcement of the structure will also need to be strengthened.
これらのことを考慮すると、線量率寄与の大き
い高圧タービン入口配管廻りに重点的に遮蔽を施
し全体の線量率を下げ、その他の被遮蔽対象につ
いては、線量率寄与が多少小さい高圧タービン本
体に合せて遮蔽厚を薄くすることが考えられる。
重点的に局部遮蔽を行なうことは、被ばく低減の
点から有効であり、かつ遮蔽構造の重量を軽減で
きることにもなる。 Taking these things into consideration, we will focus on shielding around the high-pressure turbine inlet piping, which has a large contribution to the dose rate, to lower the overall dose rate, and we will shield other targets to match the high-pressure turbine main body, which has a somewhat small contribution to the dose rate. Therefore, it is possible to reduce the shielding thickness.
Concentrating local shielding is effective in terms of reducing exposure, and it also allows the weight of the shielding structure to be reduced.
上記の観点から本発明では、高圧タービン入口
配管の近くに厚い仕切り板を設け、この配管を充
分に遮蔽するとともに、天井のたわみを防止する
役割ももたせることにした。このように天井から
床まで届く構造にしても、通常運転時には遮蔽構
造内に立入ることはなく、また定検時には遮蔽構
造全体を２分割して移動させるため、作業性に影
響を与えることはない。 In view of the above, in the present invention, a thick partition plate is provided near the high-pressure turbine inlet piping to sufficiently shield the piping and also to prevent the ceiling from deflecting. Even with this structure that reaches from the ceiling to the floor, there is no need to enter the shielding structure during normal operation, and the entire shielding structure is divided into two parts and moved during regular inspections, so there is no impact on work efficiency. do not have.
その結果、遮蔽構造全体の重量を低減でき、
100トン前後の容量のクレーンでも作業可能とな
り、定検時の作業性が向上する。他の部分の遮蔽
材は板厚が薄くなるが、局部遮蔽材は充分厚くす
るので、一般公衆の被ばくを低減できるのは勿論
である。 As a result, the weight of the entire shielding structure can be reduced,
It is now possible to use a crane with a capacity of around 100 tons, improving work efficiency during regular inspections. Although the shielding material in other parts is thinner, the local shielding material is made sufficiently thick, so it goes without saying that the exposure of the general public can be reduced.
以下、本発明の一実施例を第１図により説明す
る。
An embodiment of the present invention will be described below with reference to FIG.
第１図Ａは本発明の一実施例の平面図であり、
高圧タービン本体１と高圧タービン入口配管２を
囲むように高圧タービンの鉄板遮蔽体３が設置さ
れている。 FIG. 1A is a plan view of an embodiment of the present invention;
A high-pressure turbine iron plate shield 3 is installed to surround the high-pressure turbine main body 1 and the high-pressure turbine inlet pipe 2.
高圧タービンの遮蔽構造は、図Ｂの断面図に示
すように２分割されており、フランジ４をボルト
で接合する構造となつている。また、高圧タービ
ン遮蔽構造物内には、タービン軸と垂直方向に構
造補強材５が入つており、高圧タービン遮蔽構造
物上部には、吊り具６が設けてある。 The shielding structure of the high-pressure turbine is divided into two parts, as shown in the cross-sectional view of FIG. B, and has a structure in which the flanges 4 are joined with bolts. Further, a structural reinforcing member 5 is installed in the high-pressure turbine shielding structure in a direction perpendicular to the turbine axis, and a hanging tool 6 is provided on the upper part of the high-pressure turbine shielding structure.
本発明の特徴は、高圧タービン入口配管２を囲
むように、他の部分の鉄板遮蔽体（鉄板の箱）３
よりも厚い仕切り板７を箱の天井から床まで設
け、他の部分の板を高圧タービン本体１の線量に
合せて仕切り板７より薄い板で形成したことにあ
る。 A feature of the present invention is that an iron plate shield (iron plate box) 3 of other parts surrounds the high pressure turbine inlet piping 2.
A thicker partition plate 7 is provided from the ceiling to the floor of the box, and the other parts are made of thinner plates to match the radiation dose of the high-pressure turbine body 1.
従来の高圧タービンの遮蔽構造は、放射線から
の寄与が大きい高圧タービン入口配管からの線量
で遮蔽構造物の厚さが決まつていた。高圧タービ
ン本体と高圧タービン入口配管を内包する形状で
あるため、遮蔽構造物の重量が大きくなる欠点が
あつた。 In conventional high-pressure turbine shielding structures, the thickness of the shielding structure was determined by the radiation dose from the high-pressure turbine inlet piping, which has a large contribution from radiation. Since the shielding structure encloses the high-pressure turbine main body and the high-pressure turbine inlet piping, it has the disadvantage that the weight of the shielding structure becomes large.
これに対し、本実施例によれば、遮蔽構造体内
の主要線源である高圧タービン入口配管まわりに
遮蔽材としての仕切り板７を配置する。仕切り板
７が構造強度を損わず高圧タービン入口配管廻り
に対する遮蔽板となるため、他の側壁についての
遮蔽体厚さを薄くできる。仕切り板７はまた、天
井を支えてたわみを防ぐ役目も果している。この
ことから遮蔽構造物重量は従来のものに比べ約30
〜50％程度低減できる。 In contrast, according to this embodiment, the partition plate 7 as a shielding material is arranged around the high-pressure turbine inlet pipe, which is the main radiation source inside the shielding structure. Since the partition plate 7 serves as a shield plate for the high-pressure turbine inlet piping without impairing its structural strength, the thickness of the shields for the other side walls can be reduced. The partition plate 7 also serves to support the ceiling and prevent it from deflecting. Therefore, the weight of the shielding structure is approximately 30% compared to the conventional one.
It can be reduced by ~50%.
この軽量化により、定検時メンテナンスの際に
使用するタービン建屋の天井クレーンは100トン
容量のものでよいことになる。 This weight reduction means that the turbine building's overhead crane, which is used during regular inspections and maintenance, only needs to have a capacity of 100 tons.
特に、今後は発電所を建設する場合サイトが狭
くなる傾向があり、一般公衆への被ばく低減から
高圧タービンの遮蔽構造において遮蔽を強化する
場合には、従来の方式では遮蔽構造体が重くなる
ことから本発明の効果は大きい。 In particular, when constructing power plants in the future, the sites will tend to become smaller, and when shielding is strengthened in the shielding structure of a high-pressure turbine in order to reduce radiation exposure to the general public, conventional methods require that the shielding structure become heavier. Therefore, the effects of the present invention are significant.
さらに、従来と同等の構造物重量とした場合に
は遮蔽用仕切り板を厚くでき、これら仕切り板に
より主要線源である高圧タービン入口配管からの
放射線の寄与を特に低減可能である。この場合
は、一般公衆の被ばく線量を従来の遮蔽構造に比
べ、約80％低減させることができる。 Furthermore, when the weight of the structure is the same as that of the conventional structure, the shielding partition plates can be made thicker, and these partition plates can particularly reduce the contribution of radiation from the high-pressure turbine inlet piping, which is the main radiation source. In this case, the exposure dose to the general public can be reduced by approximately 80% compared to conventional shielding structures.
第２図に本発明の他の実施例を示す。 FIG. 2 shows another embodiment of the invention.
第２図では高圧タービンの遮蔽構造をタービン
軸に平行に２分割したものである。ここでは、遮
蔽構造体の天井内側に施す構造補強材５をタービ
ン軸と平行とする構造である。これに対しタービ
ン軸と垂直に仕切り板７を入れることで、構造物
のたわみに対する強度が増加する。 In FIG. 2, the shielding structure of the high-pressure turbine is divided into two parts parallel to the turbine axis. Here, the structure is such that the structural reinforcing material 5 provided on the inside of the ceiling of the shielding structure is parallel to the turbine axis. On the other hand, by inserting the partition plate 7 perpendicularly to the turbine axis, the strength of the structure against deflection is increased.
本実施例の遮蔽構造体でも従来の遮蔽構造物と
同等の遮蔽効果を有し、かつ遮蔽構造物の重量低
減、軽量化に伴い操作性がよくなることは、第１
図の場合と同様である。 The first advantage is that the shielding structure of this example has the same shielding effect as the conventional shielding structure, and that the weight of the shielding structure is reduced and the operability is improved.
This is the same as the case shown in the figure.
本発明では、高圧タービン入口配管を取り囲み
天井から床までの厚い仕切り板を設け、他の遮蔽
構造の板厚は薄くしたので、次の効果が得られ
る。
In the present invention, a thick partition plate from the ceiling to the floor surrounding the high-pressure turbine inlet pipe is provided, and the thickness of the other shielding structures is made thin, so that the following effects can be obtained.
(1) 前記仕切り板に遮蔽の役目とたわみ防止の役
目とを持たせたので、遮蔽構造全体の重量が従
来と比べて、約３〜５割低減できる。(1) Since the partition plate has the role of shielding and preventing deflection, the weight of the entire shielding structure can be reduced by about 30 to 50% compared to the conventional structure.
(2) 遮蔽構造の重量軽量化に伴い、定検時メンテ
ナンス性が向上する。(2) As the weight of the shielding structure is reduced, maintainability during periodic inspections is improved.
(3) 一般公衆への被ばく線量低減の目的から遮蔽
構造の遮蔽強化を施した場合でも、分解や吊り
上げ時に必要となるタービン建屋天井クレーン
容量が従来に比べ小さいものでもよい。(3) Even if the shielding structure is strengthened for the purpose of reducing the exposure dose to the general public, the capacity of the turbine building overhead crane required for disassembly and lifting may be smaller than before.
(4) 従来の遮蔽構造と同等の重量とした場合、厚
い仕切り板に遮蔽効果をもたせたことにより遮
蔽性能が向上し、一般公衆の被ばく線量は従来
の遮蔽構造に比べ、約２割程度まで低減でき
る。(4) When the weight is equivalent to that of a conventional shielding structure, the shielding performance is improved by adding a shielding effect to the thick partition plate, and the exposure dose to the general public is reduced to about 20% of that of the conventional shielding structure. Can be reduced.
第１図Ａは本発明による高圧タービンの遮蔽構
造物の一実施例の平面図、第１図ＢはそのＢ−Ｂ
断面図、第２図Ａは本発明の他の実施例の平面
図、第２図ＢはそのＢ−Ｂ断面図、第３図Ａは従
来例の平面図、第３図ＢはそのＢ−Ｂ断面図であ
る。
１……高圧タービン本体、２……高圧タービン
入口配管、３……鉄板遮蔽体、４……フランジ、
５……構造補強材、６……吊り具、７……仕切り
板。
FIG. 1A is a plan view of an embodiment of the shielding structure for a high-pressure turbine according to the present invention, and FIG.
2A is a plan view of another embodiment of the present invention, FIG. 2B is a sectional view taken along the line B-B, FIG. 3A is a plan view of the conventional example, and FIG. 3B is a plan view taken along the line B-- It is a sectional view of B. 1... High pressure turbine main body, 2... High pressure turbine inlet piping, 3... Iron plate shield, 4... Flange,
5... Structural reinforcing material, 6... Hanging tool, 7... Partition plate.
Claims (1)
ービンとその蒸気を前記高圧タービンに導く高圧
タービン入口配管とからの放射線を鉄板の箱で遮
蔽する高圧タービンの遮蔽構造において、高圧タ
ービン本体より線量が高い前記高圧タービン入口
配管を取囲む厚い仕切り板を前記箱の天井から床
まで設け、他の部分の板を前記高圧タービン本体
の線量に合せて前記仕切り板より薄い板で形成し
たことを特徴とする高圧タービンの遮蔽構造。1. In the high-pressure turbine shielding structure where a steel box shields radiation from the high-pressure turbine that uses radioactive steam generated in a nuclear reactor and the high-pressure turbine inlet piping that guides the steam to the high-pressure turbine, the radiation dose is higher than the high-pressure turbine itself. A thick partition plate surrounding the high-pressure turbine inlet pipe is provided from the ceiling to the floor of the box, and plates in other parts are formed of thinner plates than the partition plate in accordance with the radiation dose of the high-pressure turbine main body. High pressure turbine shielding structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61052221A JPS62209393A (en) | 1986-03-10 | 1986-03-10 | Shielding structure of high-pressure turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61052221A JPS62209393A (en) | 1986-03-10 | 1986-03-10 | Shielding structure of high-pressure turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62209393A JPS62209393A (en) | 1987-09-14 |
| JPH0546919B2 true JPH0546919B2 (en) | 1993-07-15 |
Family
ID=12908692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61052221A Granted JPS62209393A (en) | 1986-03-10 | 1986-03-10 | Shielding structure of high-pressure turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62209393A (en) |
-
1986
- 1986-03-10 JP JP61052221A patent/JPS62209393A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62209393A (en) | 1987-09-14 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |