JPH1138191A - Method for reducing underground migration of radioactive nuclide - Google Patents
Method for reducing underground migration of radioactive nuclideInfo
- Publication number
- JPH1138191A JPH1138191A JP19817797A JP19817797A JPH1138191A JP H1138191 A JPH1138191 A JP H1138191A JP 19817797 A JP19817797 A JP 19817797A JP 19817797 A JP19817797 A JP 19817797A JP H1138191 A JPH1138191 A JP H1138191A
- Authority
- JP
- Japan
- Prior art keywords
- radioactive waste
- stable isotope
- radionuclide
- container
- radioactive
- 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.)
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- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、低レベル放射性廃
棄物、超ウラン元素放射性廃棄物等の原子力産業に関係
した放射性廃棄物、並びにアイソトープ系放射性廃棄物
等の医療、科学研究に関係した放射性廃棄物を地中に埋
設して処分する際に放射性廃棄物に含有する放射性核種
の地中移行を低減する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to radioactive wastes related to the nuclear industry, such as low-level radioactive waste and transuranium elemental radioactive waste, and radioactive wastes related to medical and scientific research, such as isotope-based radioactive waste. The present invention relates to a method for reducing the transfer of radionuclides contained in radioactive waste into the ground when disposing of the waste by burying it in the ground.
【０００２】[0002]
【従来の技術】この種の放射性廃棄物の処分方法では、
放射能が減衰するまでの長期間、人間生活圏から隔離す
ることが求められている。この放射性廃棄物の処分方法
としては、地中埋設処分が有力である。従来、この種の
放射性廃棄物に含有する放射性核種の地中移行を低減す
る方法として、例えば低レベル放射性廃棄物はドラム缶
のような金属容器に収容してモルタルで固化した後、モ
ルタル及びベントナイト等の充填材を固化体の周囲に配
置して地中に埋設されている。ここでモルタル及びベン
トナイト等の充填材は放射性核種の溶解度を抑制し、地
下水を通りにくくするとともに、地下水中に溶解した放
射性核種を吸着して地層中への移行を抑える人工バリア
として作用する。2. Description of the Related Art In this type of radioactive waste disposal method,
There is a need for isolation from human habitats for long periods of time before radioactivity decay. Underground disposal is a promising method for disposing of this radioactive waste. Conventionally, as a method of reducing the transfer of radionuclides contained in this type of radioactive waste into the ground, for example, low-level radioactive waste is contained in a metal container such as a drum, solidified with mortar, and then mortar and bentonite. Is placed around the solidified body and buried underground. Here, the filler such as mortar and bentonite suppresses the solubility of the radionuclide, makes it difficult to pass through the groundwater, and acts as an artificial barrier that adsorbs the radionuclide dissolved in the groundwater and suppresses migration into the formation.
【０００３】[0003]
【発明が解決しようとする課題】こうした放射性廃棄物
に含有する放射性核種は上記人工バリアにより地中への
移行は抑制されるが、近年より高濃度の放射性廃棄物の
地中への移行量を更に確実に低減することが求められて
いる。本発明の目的は、より確実に放射性廃棄物に含ま
れる放射性核種の地中移行を低減する方法を提供するこ
とにある。The transfer of radionuclides contained in such radioactive waste into the ground is suppressed by the above-mentioned artificial barrier. However, in recent years, the amount of radioactive waste having a higher concentration into the ground has been reduced. There is a demand for further reduction. An object of the present invention is to provide a method for more surely reducing the radioactive nuclides contained in radioactive waste underground.
【０００４】[0004]
【課題を解決するための手段】請求項１に係る発明は、
図１及び図２に示すように、放射性廃棄物１０をモルタ
ル１１で固化して金属容器１２に収納した後、充填材１
３又は充填材１３とコンクリート構造体１５で囲んで地
中に埋設する放射性廃棄物１０の地中処分法において、
放射性廃棄物１０に含有する放射性核種の安定同位体を
下記の(a)〜(e)のいずれか１又は２以上の方法で放射性
廃棄物１０の周囲に配置することを特徴とする放射性核
種の地中移行の低減法である。 (a) モルタル１１に上記安定同位体を添加混合して固化
する。 (b) 容器１２をＦｅを主成分とする金属材料と上記安定
同位体の金属材料との合金により形成する。 (c) 放射性廃棄物１０を入れる前の容器１２の内側に上
記安定同位体を含有する塗料を塗布して塗膜１４を形成
する。 (d) 前記充填材１３に上記安定同位体を添加混合する。 (e) 容器１２を囲んだ充填材１３を更に被包するコンク
リート構造体１５に上記安定同位体を含有させる。放射
性廃棄物１０に含有する放射性核種の安定同位体を放射
性廃棄物１０の周囲に配置することにより、埋設中に地
下水にまず放射性核種の安定同位体が溶出し、次いで放
射性廃棄物１０の放射性核種が溶出する。地下水中の当
該核種の濃度はその元素全体の溶解度で制限されるた
め、予め地下水中に安定同位体が溶出していれば、その
存在割合に応じて、廃棄物の放射性核種の地下水中に溶
解する量は実質的に低減され、放射性核種の地中移行は
低減する。The invention according to claim 1 is
As shown in FIGS. 1 and 2, after the radioactive waste 10 is solidified with a mortar 11 and stored in a metal container 12,
In the underground disposal method of the radioactive waste 10 buried in the ground surrounded by 3 or the filler 13 and the concrete structure 15,
A radionuclide characterized in that a stable isotope of a radionuclide contained in the radioactive waste 10 is arranged around the radioactive waste 10 by one or more of the following (a) to (e): It is a method of reducing underground migration. (a) The above stable isotope is added to mortar 11, mixed and solidified. (b) The container 12 is formed of an alloy of a metal material containing Fe as a main component and the above-mentioned stable isotope metal material. (c) The coating containing the above-mentioned stable isotope is applied to the inside of the container 12 before the radioactive waste 10 is put therein, thereby forming a coating film 14. (d) The above stable isotope is added to and mixed with the filler 13. (e) The above-mentioned stable isotope is contained in the concrete structure 15 further enclosing the filling material 13 surrounding the container 12. By arranging the stable isotope of the radionuclide contained in the radioactive waste 10 around the radioactive waste 10, the stable isotope of the radionuclide is eluted first into the groundwater during the embedding, and then the radionuclide of the radioactive waste 10 Elutes. Since the concentration of the nuclide in groundwater is limited by the solubility of the element as a whole, if stable isotopes have been eluted in the groundwater in advance, the radionuclide in the waste will be dissolved in the groundwater according to its abundance. And the amount of radionuclide translocation into the ground is reduced.
【０００５】請求項２に係る発明は、請求項１に係る発
明であって、前記(a),(c),(d)及び(e)の方法において、
放射性核種の安定同位体は酸化物又は水酸化物の形態で
使用される放射性核種の地中移行の低減法である。放射
性核種の安定同位体を酸化物又は水酸化物の形態にして
おくと、この安定同位体は地下水の環境下において沈殿
物を生じるため、水溶性の塩化物、硫化物と異なり、地
下水により早期に流出する恐れがない。請求項３に係る
発明は、請求項１又は２に係る発明であって、放射性核
種はコバルト、ニッケル、セレン、ジルコニウム、ニオ
ブ、モリブデン、パラジウム、スズ、アンチモン、サマ
リウム、ビスマス、又は鉛のいずれかである放射性核種
の地中移行の低減法である。これらの放射性核種は放射
性廃棄物に使用される核種であり、安定同位体が存在す
る。[0005] The invention according to claim 2 is the invention according to claim 1, wherein in the methods (a), (c), (d) and (e),
Radionuclide stable isotope is a method of reducing radionuclide translocation into the ground used in the form of oxides or hydroxides. When stable isotopes of radionuclides are in the form of oxides or hydroxides, these stable isotopes form precipitates in the environment of groundwater, and unlike water-soluble chlorides and sulfides, There is no danger of spills. The invention according to claim 3 is the invention according to claim 1 or 2, wherein the radionuclide is any one of cobalt, nickel, selenium, zirconium, niobium, molybdenum, palladium, tin, antimony, samarium, bismuth, and lead. This is a method for reducing the underground migration of radionuclides. These radionuclides are radionuclides used in radioactive waste and have stable isotopes.
【０００６】[0006]
【発明の実施の形態】本発明に適用される放射性廃棄物
は、低レベル放射性廃棄物、超ウラン元素放射性廃棄物
等の原子力産業に関係した放射性廃棄物、並びにアイソ
トープ系放射性廃棄物等の医療、科学研究に関係した放
射性廃棄物である。これらの放射性廃棄物は、地中処分
された場合、長い時間が経過すると、地下水に接触する
ようになる。この放射性廃棄物に含まれている多くの放
射性核種は遷移金属元素であり、一般的に地下水中での
溶解度は低いため、地下水中に溶解する放射性核種の量
はその溶解度によって制限される。放射性廃棄物に含有
する放射性核種の安定同位体を上記(a)〜(e)の方法で放
射性廃棄物の周囲に配置すれば、地下水中に溶解する放
射性核種の量は放射性廃棄物に含有する放射性核種とそ
の安定同位体の合計量の溶解度によって制限される。そ
のため、予め放射性核種の安定同位体の地下水中への溶
解量によって、放射性廃棄物に含まれる放射性核種の地
下水中への溶解量は実質的に低減され、放射性核種の地
中移行量が低減化する。BEST MODE FOR CARRYING OUT THE INVENTION The radioactive wastes applied to the present invention include radioactive wastes related to the nuclear industry such as low-level radioactive waste, transuranium elemental radioactive waste, and medical waste such as radioisotope-based radioactive waste. , Radioactive waste related to scientific research. If these radioactive wastes are disposed of underground, they will come into contact with groundwater over a long period of time. Since many radionuclides contained in this radioactive waste are transition metal elements and generally have low solubility in groundwater, the amount of radionuclides dissolved in groundwater is limited by the solubility. If the stable isotope of the radionuclide contained in the radioactive waste is arranged around the radioactive waste by the above methods (a) to (e), the amount of the radionuclide dissolved in the groundwater is contained in the radioactive waste Limited by the solubility of the total amount of the radionuclide and its stable isotope. Therefore, the amount of radioactive nuclides contained in radioactive wastes dissolved in groundwater is substantially reduced by the amount of stable isotopes of radionuclides dissolved in groundwater in advance, and the amount of radionuclide transport into the ground is reduced. I do.
【０００７】放射性廃棄物中に存在する放射線核種の総
重量をＸ、周囲に配置するその安定同位体の総重量をＳ
とすると、地下水中に溶解する放射線核種の相対的な低
減比Ｒは次の式（１）で示される。 Ｒ ＝ Ｘ／(Ｘ＋Ｓ) …… （１） 式（１）において、Ｓの値をＸに比較して１０3〜１０6
倍程度に大きくしておけば、低減比Ｒは１／１０００〜
１／１,０００,０００にすることができる。[0007] The total weight of radionuclides present in the radioactive waste is X, and the total weight of its stable isotopes disposed around is S.
Then, the relative reduction ratio R of the radionuclide dissolved in the groundwater is represented by the following equation (1). R = X / (X + S) (1) In the formula (1), the value of S is compared with X to 10 3 to 10 6.
If it is increased about twice, the reduction ratio R is 1/1000 to 100
It can be 1 / 1,000,000.
【０００８】放射性廃棄物に含有し、安定同位体の存在
する本発明に適する放射性核種としてはコバルト(Co)、
ニッケル(Ni)、セレン(Se)、ジルコニウム(Zr)、ニオブ
(Nb)、モリブデン(Mo)、パラジウム(Pd)、スズ(Sn)、ア
ンチモン(Sb)、サマリウム(Sm)、ビスマス(Bi)、又は鉛
(Pb)が挙げられる。The radionuclides suitable for the present invention, which are contained in radioactive waste and have stable isotopes, include cobalt (Co),
Nickel (Ni), selenium (Se), zirconium (Zr), niobium
(Nb), molybdenum (Mo), palladium (Pd), tin (Sn), antimony (Sb), samarium (Sm), bismuth (Bi), or lead
(Pb).
【０００９】上記放射性核種の安定同位体を放射性廃棄
物の周囲に配置する第１の方法は図１に示すように、ド
ラム缶等の金属容器１２内に収容された放射性廃棄物１
０を固化するために使用されるモルタル１１に安定同位
体を添加混合する方法である。上記放射性核種の安定同
位体を放射性廃棄物の周囲に配置する第２の方法は図１
に示すように、金属容器１２をＦｅを主成分とする金属
材料と安定同位体の金属材料との合金により形成する方
法である。上記放射性核種の安定同位体を放射性廃棄物
の周囲に配置する第３の方法は図１及び図２に示すよう
に、放射性廃棄物１０を入れる前の金属容器１２の内側
に安定同位体を含有する塗料を塗布して塗膜１４を形成
する方法である。上記放射性核種の安定同位体を放射性
廃棄物の周囲に配置する第４の方法は図１に示すよう
に、金属容器１２を囲んだ充填材１３を更に被包するコ
ンクリート構造体１５に安定同位体を含有させる方法で
ある。上記放射性核種の安定同位体を放射性廃棄物の周
囲に配置する第５の方法は図１に示すように、充填材１
３に安定同位体を添加混合する方法である。A first method of disposing stable isotopes of the radionuclide around a radioactive waste is as shown in FIG. 1, wherein the radioactive waste 1 contained in a metal container 12 such as a drum can is used.
This is a method in which a stable isotope is added to and mixed with mortar 11 used to solidify 0. A second method of disposing stable isotopes of the radionuclide around radioactive waste is shown in FIG.
In this method, the metal container 12 is formed of an alloy of a metal material containing Fe as a main component and a stable isotope metal material as shown in FIG. A third method of disposing the stable isotope of the radionuclide around the radioactive waste is to include the stable isotope inside the metal container 12 before the radioactive waste 10 is put therein, as shown in FIGS. This is a method of forming a coating film 14 by applying a paint to be applied. As shown in FIG. 1, a fourth method for disposing the stable isotope of the radionuclide around the radioactive waste is as follows: a stable isotope is added to the concrete structure 15 further enclosing the filler 13 surrounding the metal container 12. It is a method of containing. The fifth method of disposing the stable isotope of the radionuclide around the radioactive waste is as shown in FIG.
In this method, a stable isotope is added to 3 and mixed.
【００１０】前記第１、第３、第４及び第５の方法にお
いて、放射性核種の安定同位体は酸化物又は水酸化物の
形態で使用されることが望ましい。この場合、安定同位
体は地下水環境において、沈殿物を生じるため、塩化
物、硫化物のような他の形態と比べて地下水により早期
に流出する恐れがない。In the first, third, fourth and fifth methods, the stable isotope of the radionuclide is preferably used in the form of an oxide or a hydroxide. In this case, since the stable isotope forms a precipitate in the groundwater environment, there is no possibility that the stable isotope will flow out of the groundwater earlier than other forms such as chloride and sulfide.
【００１１】[0011]
【発明の効果】以上述べたように、本発明によれば、放
射性廃棄物をモルタルで固化して収容した金属容器を充
填材で囲んで地中に埋設する放射性廃棄物の地中処分す
る際に、放射性廃棄物に含有する放射性核種の安定同位
体を放射性廃棄物の周囲に配置するようにしたので、非
放射性元素である安定同位体の存在による地下水中での
相対的な溶解度の抑制効果が生じる。これにより、放射
性核種の地中移行量が低減し、将来にわたって被曝量を
低減化し、安全性を向上することが可能となる。As described above, according to the present invention, a radioactive waste solidified with mortar is enclosed in a metal container and is filled with a filler, and the radioactive waste embedded in the ground is disposed of underground. In addition, stable isotopes of radionuclides contained in radioactive waste are arranged around radioactive waste, so the effect of suppressing the relative solubility in groundwater due to the presence of stable isotopes, which are non-radioactive elements Occurs. As a result, the amount of radionuclide transport into the ground can be reduced, the exposure dose can be reduced in the future, and safety can be improved.
【図１】本発明の放射性核種の地中処分状況を示す図。FIG. 1 is a view showing the situation of underground disposal of a radionuclide of the present invention.
【図２】図１のＡ部の拡大図。FIG. 2 is an enlarged view of a portion A in FIG.
１０ 放射性廃棄物 １１ モルタル １２ 金属容器 １３ 充填材 １４ 塗膜 １５ コンクリート構造体 DESCRIPTION OF SYMBOLS 10 Radioactive waste 11 Mortar 12 Metal container 13 Filler 14 Coating film 15 Concrete structure
Claims (3)
して金属容器(12)に収納した後、充填材(13)又は充填材
(13)とコンクリート構造体(15)で囲んで地中に埋設する
放射性廃棄物(10)の地中処分法において、 前記放射性廃棄物(10)に含有する放射性核種の安定同位
体を下記の(a)〜(e)のいずれか１又は２以上の方法で前
記放射性廃棄物(10)の周囲に配置することを特徴とする
放射性核種の地中移行の低減法。 (a) 前記モルタル(11)に前記安定同位体を添加混合して
固化する。 (b) 前記容器(12)をＦｅを主成分とする金属材料と前記
安定同位体の金属材料との合金により形成する。 (c) 前記放射性廃棄物(10)を入れる前の前記容器(12)の
内側に前記安定同位体を含有する塗料を塗布して塗膜(1
4)を形成する。 (d) 前記充填材(13)に前記安定同位体を添加混合する。 (e) 前記容器(12)を囲んだ充填材(13)を更に被包するコ
ンクリート構造体(15)に前記安定同位体を含有させる。1. After the radioactive waste (10) is solidified with a mortar (11) and stored in a metal container (12), a filler (13) or a filler is filled.
In the underground disposal method of radioactive waste (10) buried underground surrounded by (13) and a concrete structure (15), the stable isotope of the radionuclide contained in the radioactive waste (10) is as follows: A method for reducing radionuclide migration into the ground, wherein the method is arranged around the radioactive waste (10) by any one or more of the methods (a) to (e). (a) The mortar (11) is mixed with the stable isotope and solidified. (b) The container (12) is formed of an alloy of a metal material containing Fe as a main component and the metal material of the stable isotope. (c) A coating containing the stable isotope is applied to the inside of the container (12) before the radioactive waste (10) is charged, and a coating film (1
Form 4). (d) The stable isotope is added to and mixed with the filler (13). (e) The stable isotope is contained in a concrete structure (15) further enclosing the filler (13) surrounding the container (12).
て、放射性核種の安定同位体は酸化物又は水酸化物の形
態で使用される請求項１記載の低減法。2. The method according to claim 1, wherein in the methods (a), (c), (d) and (e), the stable isotope of the radionuclide is used in the form of an oxide or a hydroxide. Law.
ン、ジルコニウム、ニオブ、モリブデン、パラジウム、
スズ、アンチモン、サマリウム、ビスマス、又は鉛のい
ずれかである請求項１又は２記載の低減法。3. The radionuclide is cobalt, nickel, selenium, zirconium, niobium, molybdenum, palladium,
3. The reduction method according to claim 1, wherein the reduction method is any one of tin, antimony, samarium, bismuth, and lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19817797A JPH1138191A (en) | 1997-07-24 | 1997-07-24 | Method for reducing underground migration of radioactive nuclide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19817797A JPH1138191A (en) | 1997-07-24 | 1997-07-24 | Method for reducing underground migration of radioactive nuclide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1138191A true JPH1138191A (en) | 1999-02-12 |
Family
ID=16386764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19817797A Withdrawn JPH1138191A (en) | 1997-07-24 | 1997-07-24 | Method for reducing underground migration of radioactive nuclide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1138191A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100926458B1 (en) | 2007-11-29 | 2009-11-13 | 한국원자력연구원 | The high level radioactive waste containing module comprising the adsorption wall for retarding the negative ion nuclide and the method thereof |
| JP2014095551A (en) * | 2012-11-07 | 2014-05-22 | Narasaki Seisakusho:Kk | Radioactive waste storage device and civil engineering structure using the same |
| US9117556B2 (en) | 2012-07-17 | 2015-08-25 | Yamamoto Foundation Works Co., Ltd. | Method for waste burial and container for waste storage |
| CN109323969A (en) * | 2018-10-19 | 2019-02-12 | 中国辐射防护研究院 | A kind of absorption nucleic fast transferring soil column leaching method and its experimental provision by force |
-
1997
- 1997-07-24 JP JP19817797A patent/JPH1138191A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100926458B1 (en) | 2007-11-29 | 2009-11-13 | 한국원자력연구원 | The high level radioactive waste containing module comprising the adsorption wall for retarding the negative ion nuclide and the method thereof |
| US9117556B2 (en) | 2012-07-17 | 2015-08-25 | Yamamoto Foundation Works Co., Ltd. | Method for waste burial and container for waste storage |
| JP2014095551A (en) * | 2012-11-07 | 2014-05-22 | Narasaki Seisakusho:Kk | Radioactive waste storage device and civil engineering structure using the same |
| CN109323969A (en) * | 2018-10-19 | 2019-02-12 | 中国辐射防护研究院 | A kind of absorption nucleic fast transferring soil column leaching method and its experimental provision by force |
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