JPH077104B2 - Decontamination method for radioactive contaminants - Google Patents

Decontamination method for radioactive contaminants

Info

Publication number
JPH077104B2
JPH077104B2 JP60110130A JP11013085A JPH077104B2 JP H077104 B2 JPH077104 B2 JP H077104B2 JP 60110130 A JP60110130 A JP 60110130A JP 11013085 A JP11013085 A JP 11013085A JP H077104 B2 JPH077104 B2 JP H077104B2
Authority
JP
Japan
Prior art keywords
decontamination
ultrasonic
radioactive
decontaminated
radioactive contaminants
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
Application number
JP60110130A
Other languages
Japanese (ja)
Other versions
JPS61269097A (en
Inventor
孝雄 会津
克一 岩田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Chubu Electric Power Co Inc
Original Assignee
NGK Insulators Ltd
Chubu Electric Power Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd, Chubu Electric Power Co Inc filed Critical NGK Insulators Ltd
Priority to JP60110130A priority Critical patent/JPH077104B2/en
Publication of JPS61269097A publication Critical patent/JPS61269097A/en
Publication of JPH077104B2 publication Critical patent/JPH077104B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Cleaning By Liquid Or Steam (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Measurement Of Radiation (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、例えば原子力施設内に於いて放射能で汚染さ
れた放射能汚染物質を、特定の薬液の存在下で超音波振
動を加えて除染する放射能汚染物の除染方法に関するも
のである。
DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention applies radioactive vibration polluted in a nuclear facility, for example, to ultrasonic vibration in the presence of a specific chemical solution. The present invention relates to a decontamination method for radioactive contaminants to be decontaminated.

(従来の技術) 原子力施設内に於いて放射能で汚染された放射能汚染物
質、例えば原子力施設内で使用される工具や防護具等
は、すべて除染する必要がある。従来その除染方法とし
ては、電解除染法あるいはブラスト法が広く用いられて
きた。また最近になって、除染液として水または有機溶
媒を使用して、必要により超音波洗浄を行う除染装置が
特開昭59−83097号公報において開示されている。
(Prior Art) It is necessary to decontaminate all radioactive pollutants contaminated with radioactivity in nuclear facilities, such as tools and protective equipment used in nuclear facilities. Conventionally, as the decontamination method, an electro-deletion dyeing method or a blasting method has been widely used. Further, recently, a decontamination apparatus that uses water or an organic solvent as a decontamination solution and performs ultrasonic cleaning as necessary has been disclosed in JP-A-59-83097.

(発明が解決しようとする問題点) しかしながら、上述した電解除染法では、ゴムやプラス
チック等の非導体材質の除染には使用できない欠点があ
った。またブラスト法においては、非導体材質の除染に
は使用可能であるが、配管等の内面深くの除染は困難で
あると共に、工具等の小物でも1個ずつ除染しなければ
ならない欠点があった。さらに上述した有機溶媒等を用
いる超音波除染装置では、汚染物が油脂、ペイント、ル
ーズ汚染等の場合の除染には効果があったが、他の汚染
の場合は放射能の除染を完全に行うことができない欠点
があった。
(Problems to be Solved by the Invention) However, the above-mentioned electro-deletion dyeing method has a drawback that it cannot be used for decontaminating non-conductor materials such as rubber and plastic. Further, the blast method can be used for decontaminating non-conductive materials, but it is difficult to decontaminate deep inside surfaces such as pipes, and there is the disadvantage that small objects such as tools must be decontaminated one by one. there were. Furthermore, the ultrasonic decontamination device using the organic solvent described above was effective for decontamination when contaminants were fats, paints, loose contamination, etc., but for other contaminations, decontamination of radioactivity was performed. There was a drawback that could not be done completely.

本発明の目的は上述した不具合を解消して、放射能汚染
物質をその材質を問わず一般廃棄物として取扱えるレベ
ルまで除染できると共に、複雑な形状のものでもほぼ完
全に除染することができる放射能汚染物の除染方法を提
供しようとするものである。
The object of the present invention is to eliminate the above-mentioned inconvenience, and to decontaminate radioactive pollutants to a level at which they can be handled as general waste regardless of their materials, and to almost completely decontaminate even complicated shapes. It is intended to provide a decontamination method for radioactive contamination that can be performed.

(問題点を解決するための手段) 本発明の放射能汚染物の除染方法は、放射能で汚染され
た放射性汚染物質を、硫酸:5〜15%、シュウ酸:1〜5%
のうちの少なくとも1種以上と、リン酸:5〜30%とを混
合した薬液を含む除染液中に浸漬し、80℃以下の加温下
で除染槽中に配置された超音波発生器により直接的に超
音波振動を加えて除染することを特徴とするものであ
る。
(Means for Solving Problems) In the method for decontaminating radioactive contaminants of the present invention, radioactive contaminants contaminated with radioactive substances are converted into sulfuric acid: 5 to 15%, oxalic acid: 1 to 5%.
At least one of the above and phosphoric acid: 5-30% is immersed in a decontamination solution containing a chemical solution, and ultrasonic waves are placed in the decontamination tank under heating at 80 ° C or less. The decontamination is performed by directly applying ultrasonic vibration with a container.

(作用) 本発明では、リン酸、硫酸、シュウ酸のうちの少なくと
も1種以上の薬液を含む特定の薬液中で超音波洗浄を行
うよう構成して、放射能汚染物をほぼ完全に除染してい
る。また、放射能汚染物が複雑な形状のものでも、特定
の薬液中の超音波洗浄によりほぼ完全に除染できる。
(Operation) In the present invention, ultrasonic cleaning is performed in a specific chemical containing at least one chemical selected from phosphoric acid, sulfuric acid and oxalic acid to almost completely decontaminate radioactive contaminants. is doing. Further, even if the radioactive contaminant has a complicated shape, it can be almost completely decontaminated by ultrasonic cleaning in a specific chemical solution.

(実施例) 以下本発明を図面を参照して詳細に説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

第1図は本発明の除染方法を実施する装置の一実施例を
示す線図である。第1図に示す実施例において、除染槽
1内にはリン酸5〜30%(好ましくは10〜15%)、硫酸
5〜25%(好ましくは10〜20%)、シュウ酸1〜5%
(好ましくは2〜3%)のうちの少なくとも1種以上の
薬液を主成分とし、キレート剤等の添加剤を加えた除染
液2が満たされている。除染槽1の底部には超音波発振
子3を設けると共に、除染槽1の4面の側壁にもそれぞ
れ超音波発振子4,5,6および7を第2図にその正面図を
示すように配置する。さらに除染槽1の上面には、移動
式超音波発振子8を設け、除染用バスケット9を除染槽
1内にセットした後第1図に示す位置に発振子8を設置
する。除染槽1には除染液2の温度を調整するためのヒ
ータ15を設けると共に、内部の除染液2中の不純物を除
去するためフィルター16および除染液循環ポンプ17を設
けて除染液2の浄化を行っている。
FIG. 1 is a diagram showing an embodiment of an apparatus for carrying out the decontamination method of the present invention. In the embodiment shown in FIG. 1, in the decontamination tank 1, phosphoric acid 5-30% (preferably 10-15%), sulfuric acid 5-25% (preferably 10-20%), oxalic acid 1-5 %
It is filled with the decontamination liquid 2 containing at least one or more chemical liquids (preferably 2 to 3%) as a main component and an additive such as a chelating agent. An ultrasonic wave oscillator 3 is provided at the bottom of the decontamination tank 1, and ultrasonic wave oscillators 4, 5, 6 and 7 are provided on the four side walls of the decontamination tank 1, respectively, in FIG. To arrange. Further, a movable ultrasonic oscillator 8 is provided on the upper surface of the decontamination tank 1, the decontamination basket 9 is set in the decontamination tank 1, and then the oscillator 8 is installed at the position shown in FIG. The decontamination tank 1 is provided with a heater 15 for adjusting the temperature of the decontamination solution 2, and a filter 16 and a decontamination solution circulation pump 17 are provided for removing impurities in the decontamination solution 2 inside for decontamination. Liquid 2 is being purified.

また、内部に被除染物13を収容する例えば耐食材料であ
るハステロイからなる除染用バスケット9は、昇降用モ
ータ10によってその昇降動作を制御され、さらに除染処
理終了後はリンス槽11内のリンス液12中へセットできる
よう構成している。リンス槽11内のリンス液12として
は、除染処理終了後被除染物13に付着した除染液2を洗
浄できる例えば水等を使用し、リンス槽11の底部に設け
た超音波発振子14と共動して超音波洗浄を行う。
The decontamination basket 9 made of, for example, Hastelloy, which is a corrosion-resistant material, containing the substance 13 to be decontaminated is controlled to move up and down by a lifting motor 10, and after the decontamination process is completed, the decontamination basket 9 It is configured so that it can be set in the rinse liquid 12. As the rinse liquid 12 in the rinse tank 11, for example, water or the like that can wash the decontamination liquid 2 attached to the decontamination object 13 after the decontamination process is used, and the ultrasonic oscillator 14 provided at the bottom of the rinse tank 11 is used. And ultrasonic cleaning.

以下、本発明の除染方法を説明する。まず、放射能で汚
染された放射能汚染物質である被除染物13を除染用バス
ケット9内に収容し、上述した濃度に調整されたリン
酸、硫酸、シュウ酸のうちの少なくとも1種以上の薬液
を含む除染液2中に上昇用モータ10の駆動により浸漬す
る。ヒータ15により除染液2の温度を80℃以下、好まし
くは40〜60℃に加温した後、超音波発振子3〜8により
10〜30KHz好ましくは20KHz程度を超音波を除染液2に印
加して超音波洗浄を行う。なお、このときの除染時間は
2〜30分程度で充分である。また、除染効率を高めるた
めに、除染槽1の下方より空気を吹込んでもよいと共
に、被除染物13を除染液2中で揺動してもよい。上述し
たようにして除染処理が終了した被除染物13は、除染用
バスケット9ごと昇降用モータ10の駆動によりリンス槽
11内のリンス液12中に浸漬されて、超音波洗浄を実施し
て除染液2を洗浄する。除染後の被除染物13は工具とし
て再使用したり、一般廃棄物として廃棄される。
Hereinafter, the decontamination method of the present invention will be described. First, a substance to be decontaminated 13 which is a radioactive pollutant is contained in a decontamination basket 9 and at least one of phosphoric acid, sulfuric acid and oxalic acid adjusted to the above-mentioned concentration is used. It is dipped in the decontamination solution 2 containing the chemical solution by driving the ascending motor 10. After heating the temperature of the decontamination liquid 2 to 80 ° C. or lower, preferably 40 to 60 ° C. by the heater 15, the ultrasonic wave oscillator 3 to 8 is used.
An ultrasonic wave is applied to the decontamination liquid 2 at 10 to 30 KHz, preferably about 20 KHz to perform ultrasonic cleaning. The decontamination time at this time is about 2 to 30 minutes. Further, in order to enhance the decontamination efficiency, air may be blown from below the decontamination tank 1, and the decontamination object 13 may be swung in the decontamination liquid 2. The decontamination object 13 that has been decontaminated as described above is rinsed with the decontamination basket 9 by driving the lifting motor 10.
The decontamination liquid 2 is washed by being immersed in the rinse liquid 12 in 11 and performing ultrasonic cleaning. The decontaminated material 13 after decontamination is reused as a tool or discarded as general waste.

なお、本発明において除染液の温度を80℃以下と限定し
たのは、80℃以上であると効果的に除染処理を行うこと
ができないためである。
The reason for limiting the temperature of the decontamination solution to 80 ° C. or lower in the present invention is that decontamination treatment cannot be effectively performed at 80 ° C. or higher.

実施例1 放射能で汚染された100φ配管を、後述する第1表に示
すように除染液の組成、除染液温度を各種変化させて除
染した。除染時に印加される超音波振動子の周波数は20
KHz、出力密度は0.8〜1.5W/cm3であった。また、除染処
理中除染用バスケットを昇降用モータにより3〜5cm
(1波長分以上)の距離を2〜3回/分の速度で上下に
動かした。超音波振動子の個数および位置は第1図およ
び第2図に示す実施例と同一にした。除染処理終了後被
除染物をリンス槽で洗浄して、モニタリング装置により
放射能濃度をGM管の測定値(カウント/分)として求
め、除染前の測定値と比較して除染性能を除染指数(D
F)として求めた。結果を第1表に示す。
Example 1 A 100φ pipe contaminated with radioactivity was decontaminated by variously changing the composition of the decontamination solution and the temperature of the decontamination solution as shown in Table 1 described later. The frequency of the ultrasonic transducer applied during decontamination is 20
The KHz and power density were 0.8 to 1.5 W / cm 3 . In addition, the decontamination basket during decontamination is 3-5 cm
The distance (for one wavelength or more) was moved up and down at a speed of 2-3 times / minute. The number and position of ultrasonic transducers were the same as those in the examples shown in FIGS. 1 and 2. After the decontamination process is completed, wash the decontaminated material in the rinse tank and obtain the radioactivity concentration with the monitoring device as the measured value (count / min) of the GM tube. Compare the measured value before decontamination with the decontamination performance. Decontamination index (D
F) was asked as. The results are shown in Table 1.

本発明は上述した実施例にのみ限定されるものではな
く、幾多の変形、変更が可能である。例えば、上述した
超音波発振子の個数および配置は一実施例であり、他の
構成を取りうることはいうまでもない。
The present invention is not limited to the above-described embodiments, but various modifications and changes can be made. For example, it goes without saying that the number and arrangement of the ultrasonic oscillators described above are merely examples, and other configurations can be adopted.

(発明の効果) 以上詳細に説明したところから明らかなように、本発明
の放射能汚染物の除染方法によれば、特定の薬液中での
超音波除染により放射能汚染物をその材質を問わず一般
廃棄物として取扱えるレベルまで短時間で除染できると
共に、複雑形状の放射能汚染物でも比較的簡単に除染す
ることができる。また、放射能汚染物を損傷することな
く除染することができる。
(Effects of the Invention) As is clear from the above description, according to the method for decontaminating a radioactive contaminant of the present invention, the radioactive contaminant is made of a material by ultrasonic decontamination in a specific chemical solution. Regardless of the type of waste, it can be decontaminated in a short time to a level at which it can be handled as general waste, and radioactive contaminants of complicated shapes can be decontaminated relatively easily. Moreover, decontamination can be performed without damaging the radioactive contaminants.

【図面の簡単な説明】[Brief description of drawings]

第1図は本発明の除染方法を実施する装置の一実施例を
示す線図、 第2図は第1図に示す装置の除染槽の正面図である。 1……除染槽、2……除染液 3,4,5,6,7,8,14……超音波発振子 9……除染用バスケット 10……昇降用モータ、11……リンス槽 12……リンス液、13……被除染物 15……ヒータ
FIG. 1 is a diagram showing an embodiment of an apparatus for carrying out the decontamination method of the present invention, and FIG. 2 is a front view of a decontamination tank of the apparatus shown in FIG. 1 ... Decontamination tank, 2 ... Decontamination solution 3,4,5,6,7,8,14 ... Ultrasonic oscillator 9 ... Decontamination basket 10 ... Elevating motor, 11 ... Rinse Tank 12 …… rinse liquid, 13 …… decontamination object 15 …… heater

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】放射能で汚染された放射性汚染物質を、硫
酸:5〜15%、シュウ酸:1〜5%のうちの少なくとも1種
以上と、リン酸:5〜30%とを混合した薬液を含む除染液
中に浸漬し、80℃以下の加温下で除染槽中に配置された
超音波発生器により直接的に超音波振動を加えて除染す
ることを特徴とする放射能汚染物の除染方法。
1. A radioactive contaminant contaminated with radioactivity was mixed with at least one of sulfuric acid: 5 to 15% and oxalic acid: 1 to 5%, and phosphoric acid: 5 to 30%. Radiation characterized by being immersed in a decontamination solution containing a chemical solution, and being decontaminated by directly applying ultrasonic vibrations with an ultrasonic generator placed in the decontamination tank under heating at 80 ° C or less. Decontamination method for active pollutants.
【請求項2】前記超音波振動が10〜30KHzの周波数を有
する特許請求の範囲第1項記載の放射能汚染物の除染方
法。
2. The method for decontaminating radioactive contaminants according to claim 1, wherein the ultrasonic vibration has a frequency of 10 to 30 KHz.
【請求項3】前記薬液を40〜60℃に加温する特許請求の
範囲第1項記載の放射能汚染物の除染方法。
3. The method for decontaminating radioactive contaminants according to claim 1, wherein the chemical solution is heated to 40 to 60 ° C.
JP60110130A 1985-05-24 1985-05-24 Decontamination method for radioactive contaminants Expired - Fee Related JPH077104B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60110130A JPH077104B2 (en) 1985-05-24 1985-05-24 Decontamination method for radioactive contaminants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60110130A JPH077104B2 (en) 1985-05-24 1985-05-24 Decontamination method for radioactive contaminants

Publications (2)

Publication Number Publication Date
JPS61269097A JPS61269097A (en) 1986-11-28
JPH077104B2 true JPH077104B2 (en) 1995-01-30

Family

ID=14527784

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60110130A Expired - Fee Related JPH077104B2 (en) 1985-05-24 1985-05-24 Decontamination method for radioactive contaminants

Country Status (1)

Country Link
JP (1) JPH077104B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001021687A (en) * 1999-07-02 2001-01-26 Ebara Kogyo Senjo Kk Method for treating radioactive contaminant and device used for this method
JP5209913B2 (en) * 2007-08-24 2013-06-12 東電工業株式会社 Decontamination liquid, decontamination method and decontamination system for radioactive contaminants
IT1402751B1 (en) * 2010-11-12 2013-09-18 Ecir Eco Iniziativa E Realizzazioni S R L METHOD FOR CONDITIONING SCORES ARISING FROM DISPOSAL OF NUCLEAR PLANTS
JP2013124960A (en) * 2011-12-15 2013-06-24 Shimizu Corp Treatment method of cesium-contaminated soil
JP2014035333A (en) * 2012-08-10 2014-02-24 Shimizu Corp Decontamination treatment method for burned ash

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6047216B2 (en) * 1980-07-29 1985-10-21 日本電信電話株式会社 Method for producing base material for optical fiber

Also Published As

Publication number Publication date
JPS61269097A (en) 1986-11-28

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