JPS62179689A - Apparatus for nuclear reactor core - Google Patents
Apparatus for nuclear reactor coreInfo
- Publication number
- JPS62179689A JPS62179689A JP61020120A JP2012086A JPS62179689A JP S62179689 A JPS62179689 A JP S62179689A JP 61020120 A JP61020120 A JP 61020120A JP 2012086 A JP2012086 A JP 2012086A JP S62179689 A JPS62179689 A JP S62179689A
- Authority
- JP
- Japan
- Prior art keywords
- reactor core
- nickel
- nuclear reactor
- cobalt
- stainless steel
- 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.)
- Pending
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 36
- 229910052759 nickel Inorganic materials 0.000 claims description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000011651 chromium Substances 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 239000002826 coolant Substances 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- GUTLYIVDDKVIGB-BJUDXGSMSA-N cobalt-58 Chemical compound [58Co] GUTLYIVDDKVIGB-BJUDXGSMSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 5
- 238000005253 cladding Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance 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
- Y02E30/30—Nuclear fission reactors
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は原子炉炉内にあって高温水に接する機器におい
て、溶出したニッケルが放射化されて生ずるコバルト５
８の生成量を減少せしめるためにニッケルを含有せず１
２ｗｔ％以上のクロムを主要構成元素として含有するフ
ェライト系ステンレス鋼より構成される原子炉炉心機器
に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to cobalt-5, which is generated when eluted nickel is activated in equipment that is in a nuclear reactor and comes into contact with high-temperature water.
1 does not contain nickel to reduce the amount of 8 produced.
The present invention relates to nuclear reactor core equipment made of ferritic stainless steel containing 2 wt% or more of chromium as a main constituent element.
従来の原子炉炉心機器には耐食性に優れた各種のオース
テナイト系ステンレス鋼が使用されている。Various austenitic stainless steels with excellent corrosion resistance are used in conventional nuclear reactor core equipment.
〇一般に多く用いられている５ＵＳ３０４鋼の化学組成
を一例として挙げると第１表の如くである。〇An example of the chemical composition of 5US304 steel, which is commonly used, is shown in Table 1.
０この中でニッケルはオーステナイトの安定化元素であ
り、オーステナイト系ステンレス鋼の基本元素として例
えば５ＵＳ３０４鋼では大略６ｗｔ％〜１５ｗｔ％程度
が含有されているのが通例である。0 Among these, nickel is a stabilizing element of austenite, and as a basic element of austenitic stainless steel, for example, 5US304 steel typically contains approximately 6 wt% to 15 wt%.
これらの合金から構成される機器においては、高温水な
どの原子炉冷却材との接液部がその冷却材によって腐食
し１合金の構成元素の一部が冷却材中へ溶出して腐食生
成物などの中に蓄積されることがある。In equipment made of these alloys, parts that come into contact with reactor coolant such as high-temperature water are corroded by the coolant, and some of the constituent elements of the alloy are leached into the coolant, producing corrosion products. It may be accumulated in etc.
これらの腐食生成物が原子炉炉心を通過すると熱中性子
によって照射を受け、腐食生成物中に含まれているコバ
ルトやニッケルは放射性のコバルト６０及びコバルト５
８にそれぞれ変換される。When these corrosion products pass through the reactor core, they are irradiated with thermal neutrons, and the cobalt and nickel contained in the corrosion products are converted into radioactive cobalt-60 and cobalt-5.
8 respectively.
これらの放射性元素が原子炉炉心や配管に沈着するとガ
ンマ線を長時間にわたって放出するため。When these radioactive elements are deposited in the reactor core or piping, they emit gamma rays over a long period of time.
原子炉機器の保守点検、修理等の作業における従事者の
安全対策が必要となり、作業性が著しく低下する問題が
あった。This necessitated safety measures for workers involved in maintenance, inspection, repair, and other work on reactor equipment, resulting in a problem in which work efficiency was significantly reduced.
この問題に対処するため半減期の長いコバ用１〜６０低
減を主体床としてオーステナイトステンレス鋼中のコバ
ルト含有量を通常不純物として含まれる０、０５〜０．
３ｗｔ％稈度から０．０５ｗｔ％あるいは０．０１ｗｔ
％以下に制限するなどの対策が採られてきた。To deal with this problem, the cobalt content in austenitic stainless steel is mainly reduced by 1 to 60% for cobalt, which has a long half-life, and is usually contained as an impurity.
3wt% culm degree to 0.05wt% or 0.01wt
Countermeasures have been taken, such as limiting the amount to below %.
この結果、現在原子炉におけるコバルト６０の発生量を
大巾に低減されている。As a result, the amount of cobalt-60 generated in nuclear reactors has been significantly reduced.
しかし、ニッケルについてはオーステナイト系ステンレ
ス鋼の基本元素であるため低減することははじめから配
慮されていなかった。このため、コバルト５８の低減対
策として、冷却材中の鉄イヤン濃度を制御するなどの対
策が採られているが、必ずしも十分でない問題があった
。However, since nickel is a basic element of austenitic stainless steel, no consideration was given to reducing it from the beginning. For this reason, measures have been taken to reduce cobalt-58, such as controlling the iron ion concentration in the coolant, but these are not always sufficient.
なお、この種の技術としては、例えば特公昭６０−４８
７１７号がある。In addition, as this type of technology, for example,
There is number 717.
本発明の目的は、原子炉炉心機器にニッケルを含まず１
０ｗｔ％以上のクロムを主要構成元素とするフェライト
系ステンレス鋼を用いることにより、冷却材中へのニッ
ケルの溶出をなくし、放射化によるコバルト５８の発生
を抑制せしめた原子炉炉心用機器に提供するにある。An object of the present invention is to provide a nuclear reactor core equipment that does not contain nickel.
By using ferritic stainless steel whose main constituent element is 0wt% or more of chromium, it is provided for nuclear reactor core equipment that eliminates nickel elution into the coolant and suppresses the generation of cobalt-58 due to activation. It is in.
本発明はニッケルを含有しないフェライト系ステンレス
鋼を用いて原子炉冷却材に接液する原子炉炉心用機器で
ある。本発明の目的は原子炉冷却材中へのニッケルの溶
出を防止してコバルト５８の発生を抑制することにある
から、原子炉炉心用機器としては基本的にニッケルを含
まない合金であればよい。原子炉炉心用機器としては低
放射化がはかれるとともに低食性、耐照射脆化性を具備
させる必要がある。耐食性の点から材料をみると、前記
のオーステナイト系ステンレス鋼や、フェライト系ステ
ンレス鋼等のステンレス鋼の他に高ニッケ鋼などのニッ
ケル基合金がある。これらの内、ニッケルを含まない１
０ｗし％以上のクロムを主要構成元素とするフェライト
系ステンレス鋼を除く以外の合金はいずれもニッケルを
基本元素とするものであって、耐食性は何ら問題はない
がコバルト５８の発生抑制に対しては問題を含んでいる
。The present invention is a nuclear reactor core device that uses nickel-free ferritic stainless steel and is in contact with a nuclear reactor coolant. Since the purpose of the present invention is to prevent the elution of nickel into the reactor coolant and suppress the generation of cobalt-58, basically any alloy that does not contain nickel may be used as equipment for the reactor core. . As reactor core equipment, it is necessary to have low activation, low corrosion resistance, and resistance to irradiation embrittlement. Looking at materials from the viewpoint of corrosion resistance, there are stainless steels such as the austenitic stainless steel and ferritic stainless steel mentioned above, as well as nickel-based alloys such as high nickel steel. Among these, 1 that does not contain nickel
All alloys other than ferritic stainless steels, which have 0w% or more chromium as their main constituent element, have nickel as their basic element, and although there is no problem with corrosion resistance, it is important to suppress the generation of cobalt-58. contains problems.
また、耐照射脆化性の点から材料をみると、一般的にオ
ーステナイト系材料はフェライト系材料よりも照射によ
る脆化が小さい。現在、原子炉炉心用機器としてオース
テナイトステンレス鋼やニッケル基合金の様なオーステ
ナイト系材料が用いられているのはこの耐食性と耐照射
脆化性を具備させたものとして妥当である。フェライト
系材料は圧力容器に用いられているものの、熱中性子照
射の大きい原子炉炉心部の機器に対しては耐照射脆化性
の観点から使用材料として選定外であった。Furthermore, when looking at materials from the viewpoint of resistance to irradiation embrittlement, austenitic materials are generally less susceptible to embrittlement due to irradiation than ferritic materials. Currently, austenitic materials such as austenitic stainless steel and nickel-based alloys are being used for nuclear reactor core equipment because of their corrosion resistance and radiation embrittlement resistance. Although ferritic materials are used in pressure vessels, they were not selected as materials for use in equipment in the core of nuclear reactors, which are exposed to large amounts of thermal neutron irradiation, due to their resistance to irradiation embrittlement.
フェライト系ステンレス鋼に関して検討した結果、本合
金においても不純物以上のＮを含有させることにより耐
照射脆化性が改善できることがわかった。これから、ニ
ッケルを含まず、かつ不純物以上のＮを含有させたクロ
ムを基本元素とするフェライト系ステンレス鋼より構成
される原子炉炉心用機器は、コバルト５８の発生抑制、
耐食性及び耐照射脆化性のいずれも満足できる機器であ
る。As a result of studies on ferritic stainless steels, it was found that the irradiation embrittlement resistance of this alloy can be improved by containing more N than impurities. From now on, nuclear reactor core equipment made of ferritic stainless steel whose basic element is chromium, which does not contain nickel and contains more N than impurities, will suppress the generation of cobalt-58,
The device has satisfactory corrosion resistance and radiation embrittlement resistance.
本発明に含まれる原子炉炉心用機器を例示すると制御棒
被覆管、制御棒シースなどの炉心機器の他、給水加熱器
チューブなどである。Examples of nuclear reactor core equipment included in the present invention include core equipment such as control rod cladding tubes and control rod sheaths, as well as feed water heater tubes.
Ｃｒ量として、１１．５〜２０ｗｔ％のものが好ましく
、その他重量でＣ０，０４〜０．１５％、Ｓｉ２％以下
、Ｍｎ２％以下、 ＮＯ，０４〜０．１５％を含み、残
部Ｆθからなる合金が好ましい。The amount of Cr is preferably 11.5 to 20 wt%, and other weights include CO, 04 to 0.15%, Si 2% or less, Mn 2% or less, NO, 04 to 0.15%, and the balance consists of Fθ. Alloys are preferred.
以下１本発明の一実施例を図により説明する。An embodiment of the present invention will be described below with reference to the drawings.
図は本発明により制御棒シース及び制御棒被覆管を示す
。従来本機器に用いられている５ＵＳ３０４鋼及び本発
明によるフェライト系ステンレス鋼の代表的な組成例を
第１表に示した。The figure shows a control rod sheath and control rod cladding according to the present invention. Typical composition examples of 5US304 steel conventionally used in this device and ferritic stainless steel according to the present invention are shown in Table 1.
第 １ 表
このような本発明による制御棒シース及び制御棒被覆管
は原子炉冷却材との接液部において例え腐食を受けても
ニッケルの溶出はなくコバルト５８の発生はほとんど無
視できるほど少なくなる。Table 1 Even if the control rod sheath and control rod cladding tube according to the present invention are corroded at the parts in contact with the reactor coolant, there will be no leaching of nickel and the generation of cobalt-58 will be so small that it can be ignored. .
本発明によれば、原子炉冷却材に接する原子炉炉心用機
器から腐食などにより溶出したニッケルを含む腐食生成
物が炉心において熱中性照射を受けることによって発生
するコバルト５８の生成量を従来の１７５〜１／１０に
低下できる。According to the present invention, the amount of cobalt-58 generated when corrosion products containing nickel eluted from reactor core equipment in contact with the reactor coolant due to corrosion etc. is subjected to thermal neutral irradiation in the reactor core has been reduced to 175 It can be reduced to ~1/10.
従って、定期検査時等の原子炉冷却材の被曝低減に著し
く貢献するものである。Therefore, it significantly contributes to reducing the radiation exposure of the reactor coolant during periodic inspections and the like.
図は本発明の一実施例の原子炉冷却材中における制御棒
シースと制御棒被覆管を示す全体図である。
１・・・制御棒被覆管、２・・・制御棒シース。The figure is an overall view showing a control rod sheath and a control rod cladding tube in a reactor coolant according to an embodiment of the present invention. 1... Control rod cladding tube, 2... Control rod sheath.
Claims (1)
物として含有される以上の窒素を含有し、かつニッケル
を含まないフェライト系ステンレス鋼から構成されてい
ることを特徴とする原子炉炉心用機器。1. Nuclear reactor core equipment comprising ferritic stainless steel containing 10 wt% or more of chromium as a main basic element, nitrogen in excess of that contained as an impurity, and containing no nickel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61020120A JPS62179689A (en) | 1986-02-03 | 1986-02-03 | Apparatus for nuclear reactor core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61020120A JPS62179689A (en) | 1986-02-03 | 1986-02-03 | Apparatus for nuclear reactor core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62179689A true JPS62179689A (en) | 1987-08-06 |
Family
ID=12018259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61020120A Pending JPS62179689A (en) | 1986-02-03 | 1986-02-03 | Apparatus for nuclear reactor core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62179689A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9301635B2 (en) | 2008-04-30 | 2016-04-05 | Eugster/Frismag | Method of producing a drink, and drinks-preparing device for implementing the method |
-
1986
- 1986-02-03 JP JP61020120A patent/JPS62179689A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9301635B2 (en) | 2008-04-30 | 2016-04-05 | Eugster/Frismag | Method of producing a drink, and drinks-preparing device for implementing the method |
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