CH642475A5 - METHOD FOR CHEMICAL DECONTAMINATION OF COMPONENTS. - Google Patents
METHOD FOR CHEMICAL DECONTAMINATION OF COMPONENTS. Download PDFInfo
- Publication number
- CH642475A5 CH642475A5 CH770679A CH770679A CH642475A5 CH 642475 A5 CH642475 A5 CH 642475A5 CH 770679 A CH770679 A CH 770679A CH 770679 A CH770679 A CH 770679A CH 642475 A5 CH642475 A5 CH 642475A5
- Authority
- CH
- Switzerland
- Prior art keywords
- decontamination
- solution
- suspension solution
- acid
- sulfur
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 15
- 238000009390 chemical decontamination Methods 0.000 title claims description 4
- 238000005202 decontamination Methods 0.000 claims description 28
- 230000003588 decontaminative effect Effects 0.000 claims description 25
- 239000000725 suspension Substances 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 239000000080 wetting agent Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- SHZFVLZWUVDCEN-UHFFFAOYSA-N 2-hydroxypropane-1,2,3-tricarboxylic acid;oxalic acid Chemical compound OC(=O)C(O)=O.OC(=O)CC(O)(C(O)=O)CC(O)=O SHZFVLZWUVDCEN-UHFFFAOYSA-N 0.000 claims description 2
- 229920003043 Cellulose fiber Polymers 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 2
- ABDBNWQRPYOPDF-UHFFFAOYSA-N carbonofluoridic acid Chemical compound OC(F)=O ABDBNWQRPYOPDF-UHFFFAOYSA-N 0.000 claims description 2
- ZYFXHKPHYKLIDV-UHFFFAOYSA-N hydrogen peroxide;2-hydroxypropane-1,2,3-tricarboxylic acid Chemical compound OO.OC(=O)CC(O)(C(O)=O)CC(O)=O ZYFXHKPHYKLIDV-UHFFFAOYSA-N 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 239000011368 organic material Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 11
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002657 fibrous material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 241000590629 Biblis Species 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- LBVWYGNGGJURHQ-UHFFFAOYSA-N dicarbon Chemical compound [C-]#[C+] LBVWYGNGGJURHQ-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910001055 inconels 600 Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- WWNBZGLDODTKEM-UHFFFAOYSA-N sulfanylidenenickel Chemical class [Ni]=S WWNBZGLDODTKEM-UHFFFAOYSA-N 0.000 description 1
- 229940059867 sulfur containing product ectoparasiticides Drugs 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
- G21F9/002—Decontamination of the surface of objects with chemical or electrochemical processes
- G21F9/004—Decontamination of the surface of objects with chemical or electrochemical processes of metallic surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Die vorliegende Erfindung betrifft ein Verfahren zur chemischen Dekontamination von Bauteilen insbesondere wassergekühlter Kernreaktoren, bei dem nach einer ca. lstündigen oxidativen Vorbehandlung mit alkalischer Permanganatlösung bei 85-125 °C mit Deionat zwischengespült, anschliessend für 5-20 Stunden mit einer inhibierten Citrat-Oxalat-Dekontaminationslösung mit einem auf ca. 3,5 eingestellten pH-Wert bei ebenfalls 85-125 °C gebeizt sowie dann wiederum mit Deionat gespült wird. Mit diesem aus der DE-OS 2613351 bekannten Verfahren wird ohne Schädigung des Strukturmaterials die im Primärkreislauf eines Kernkraftwerkes nach kurzer Betriebszeit infolge der Korrosion der Strukturmaterialien entstehende zusammenhängende dichte Oxidschicht beseitigt, die während des Betriebes auch in Bauteilen, die nicht im direkten Strahlungsfeld des Kernbereiches liegen, kontaminiert, also radioaktiv wird. The present invention relates to a process for the chemical decontamination of components, in particular water-cooled nuclear reactors, in which after an approximately 1-hour oxidative pretreatment with alkaline permanganate solution at 85-125 ° C., intermediate rinsing with deionate, then with an inhibited citrate oxalate for 5-20 hours. Decontamination solution with a pH adjusted to approx. 3.5, also pickled at 85-125 ° C and then rinsed again with deionized water. With this method known from DE-OS 2613351, the coherent dense oxide layer which arises in the primary circuit of a nuclear power plant after a short period of operation as a result of the corrosion of the structural materials and which is also in components which are not in the direct radiation field of the core area during operation is eliminated without damage to the structural material , contaminated, i.e. becomes radioactive.
Zur Verbesserung der chemischen Dekontamination ist erfindungsgemäss vorgesehen, dass anschliessend mit einer Citronensäure-Wasserstoffperoxid-Lösung, die suspendierte Feststoffteilchen enthält, bei 20-80 °C für 2-8 Stunden nachbehandelt wird. Damit sollen durch eine leichte mechanische Scheuerwirkung die nach der bekannten Behandlung noch möglicherweise verbliebenen, lockerhaftenden Restoxidbeläge entfernt werden. In order to improve the chemical decontamination, it is provided according to the invention that after-treatment is subsequently carried out with a citric acid-hydrogen peroxide solution, which contains suspended solid particles, at 20-80 ° C. for 2-8 hours. This is intended to remove, by means of a slight mechanical abrasive effect, the loosely adhering residual oxide deposits which may still remain after the known treatment.
Die Suspensionslösung enthält vorteilhaft auf 1000 ml Wasser > 1,0 g Citronensäure, > 0,5 Wasserstoffperoxid, 0,1-0,5 g Perfluorcarbonsäure und 0,1-5 g Cellulosefasern. Ferner ist es zweckmässig, dass die Fasersuspensionslösung stark bewegt wird, damit die Fasern die Werkstückoberfläche überstreichen. Diese starke Bewegung der Lösung kann in an sich bekannter Weise mittels Pumpe oder Lufteinblasung durchgeführt werden. The suspension solution advantageously contains> 1.0 g citric acid,> 0.5 hydrogen peroxide, 0.1-0.5 g perfluorocarboxylic acid and 0.1-5 g cellulose fibers per 1000 ml water. It is also expedient that the fiber suspension solution is moved vigorously so that the fibers sweep over the workpiece surface. This strong movement of the solution can be carried out in a manner known per se by means of a pump or air injection.
Als inertes Fasermaterial für die gewünschte Scheuerwirkung kann man organische und/oder anorganische Fasern sowie Gewebeschnitzel dieser Fasern einsetzen. Bei engen Rohrsystemen und bei Wärmetauschern kann man anstelle -. von organischen Fasermaterialien Gummischwammkugeln -verwenden. Diese weichen Kugeln sollten im Durchmesser 0,1-0,3 mm grösser sein als der Nenndurchmesser der zu dekontaminierenden Rohre. Organic and / or inorganic fibers and tissue chips of these fibers can be used as the inert fiber material for the desired abrasion effect. For narrow pipe systems and heat exchangers, you can replace -. of organic fiber materials - use rubber sponge balls. The diameter of these soft balls should be 0.1-0.3 mm larger than the nominal diameter of the pipes to be decontaminated.
Die oben angegebene Konzentration von 0,1-5,0 g Fasermaterial sollte immer eingehalten werden, da bei zu niedriger Konzentration die Scheuerwirkung zu gering wird und bei zu hoher Konzentration die Bewegungs- bzw. Pumpfähigkeit der Lösung nicht mehr gewährleistet ist. The above-mentioned concentration of 0.1-5.0 g fiber material should always be adhered to, since if the concentration is too low the abrasive effect becomes too low and if the concentration is too high the mobility or pumpability of the solution is no longer guaranteed.
Das Wasserstoffperoxid wird der oben genannten vorteilhaften Suspensionslösung zugegeben, um bei der Dekontaminationsnachbehandlung auch die sich evtl. bei der vorhergegangenen Behandlung gebildeten, schwerlöslichen Fe-II-Oxa-late durch Umwandlung in leichtlösliche Fe-III-Oxalate zu entfernen. Diese Gefahr der Bildung von Fe-II-Oxalaten ist vor allem bei 13- und 17%igen Cr-Stählen sowie vereinzelt auch bei unstabilisierten Cr-Ni-Stählen gegeben. Da das Wasserstoffperoxid aber gleichzeitig das Oxalat zu CO2 aufoxi-diert, kann der Suspensionslösung noch eine organische Carbon-, Dicarbon-, Oxycarbon- oder Hydroxycarbonsäure zugegeben werden, um das freiwerdende Eisenion zu komplexie-ren. Ohne Zugabe dieser Säure würde es zu einer erneuten Auszementation des Eisens kommen. The hydrogen peroxide is added to the above-mentioned advantageous suspension solution in order to also remove the sparingly soluble Fe-II-oxalates possibly formed in the previous treatment by conversion into easily soluble Fe-III-oxalates in the post-treatment of decontamination. This risk of the formation of Fe-II oxalates is particularly present in 13 and 17% Cr steels and occasionally also in unstabilized Cr-Ni steels. Since the hydrogen peroxide also oxidizes the oxalate to CO2 at the same time, an organic carbon, dicarbon, oxycarbon or hydroxycarboxylic acid can be added to the suspension solution in order to complex the released iron ion. Without the addition of this acid, the iron would be re-cemented.
Durch Zugabe des Netzmittels wird die Oberflächenspannung der Suspensionslösung stark herabgesetzt. Die Fasern können dadurch die Oberfläche intensiver bestreichen. Die Einsatzkonzentration des Netzmittels richtet sich nach der jeweils vom Hersteller angegebenen Konzentration. Es können alle diejenigen organischen Netzmittel eingesetzt werden, die frei von schwefelhaltigen Verbindungen sind. The surface tension of the suspension solution is greatly reduced by adding the wetting agent. This allows the fibers to coat the surface more intensively. The concentration of the wetting agent depends on the concentration specified by the manufacturer. All those organic wetting agents that are free of sulfur-containing compounds can be used.
Bei allen Verfahrensschritten - Vorbehandlung, Dekontaminationsbehandlung und Dekontaminationsnachbehandlung - sollten die Lösungen frei von schwefelhaltigen Verbindungen sein, denn im Primärsystem der Kernreaktoren sind schwefelhaltige Produkte unerwünscht. Sie bilden bei Ni-Legierungen bei höheren Temperaturen Nickel-Schwefel-Verbindungen, die zu spröden Phasen im Strukturmaterial führen. Weiterhin können sich in den Dampferzeugern des Primärsystems durch verschiedene Betriebszustände Polythion-säuren bilden, die bereits bei Raumtemperaturen an Inconel 600 interkristalline Korrosion auslösen. In all process steps - pretreatment, decontamination treatment and post-decontamination treatment - the solutions should be free of sulfur-containing compounds, because sulfur-containing products are undesirable in the primary system of the nuclear reactors. With Ni alloys, they form nickel-sulfur compounds at higher temperatures, which lead to brittle phases in the structural material. Furthermore, various operating conditions can form polythionic acids in the steam generators of the primary system, which trigger intergranular corrosion on Inconel 600 even at room temperatures.
Das beschriebene Dekontàminationsverfahren wurde bereits mit sehr guten Ergebnissen in der Praxis bei Grossdekontaminationen in Kernkraftwerken eingesetzt. Mitlaufende Verfahrensproben während dieser Dekontamination zeigten bei anschliessenden metallographischen Untersuchungen, The decontamination process described has already been used with very good results in practice for large-scale decontamination in nuclear power plants. Process samples during this decontamination showed in subsequent metallographic examinations that
dass durch diese erfindungsgemässe Dekontaminationsbehandlung keinerlei selektive Schäden an diesen Werkstoffen aufgetreten sind. Der Materialverlust war in allen Fällen kleiner 0,1 (im. Im folgenden werden Beispiele aus der Palette der Ergebnisse der durchgeführten Grossdekontamination, sowie der geprüften Werkstoffe aufgezeigt. that no selective damage to these materials has occurred as a result of this decontamination treatment according to the invention. The material loss was less than 0.1 in all cases (in the following, examples from the range of results of the large decontamination carried out, as well as the tested materials are shown.
Diese Zusammenstellung soll zeigen, dass mit dem beschriebenen Dekontaminationsverfahren die gesamte Palette der hochlegierten Cr-Nr-Stähle, Ni-Legierungen und hochlegierten Cr-Stählen ohne Grundmaterialschädigung mit hohen Dekontaminationsfaktoren zu dekontaminieren ist. This compilation is intended to show that the decontamination process described can be used to decontaminate the entire range of high-alloy Cr-No steels, Ni alloys and high-alloy Cr steels without damaging the base material with high decontamination factors.
5 5
10 10th
15 15
20 20th
25 25th
30 30th
35 35
40 40
45 45
50 50
55 55
60 60
65 65
3 642 475 3,642,475
Tabelle 1 : Dekontamination der Hauptkühlmittelpumpen in Biblis (KWB-A und KWB-B) Table 1: Decontamination of the main coolant pumps in Biblis (KWB-A and KWB-B)
Dekontergebnis Decontamination result
Anlage Betriebsdauer Komponente Werkstoff Dekont- Dosisleistung Dosisleistung DF System Operating time Component Material Decontamination dose rate Dose rate DF
behandlung vor nach treatment before
(h) (H)
KWB-A 1 Zyklus KWB-A 1 cycle
KWB-B KWB-B
Laufrad YD 10 Impeller YD 10
1.4313 1.4313
11 11
7000 7000
75 75
93 93
Laufrad YD30 Impeller YD30
1.4313 1.4313
8,5 8.5
7000- 7000-
-10000 -10000
50- 50-
-70 -70
100-140 100-140
Spannscheibe YD30 Spring washer YD30
1.4550 1.4550
14 14
6000 6000
60 60
100 100
Spannscheibe YD20 Spring washer YD20
1.4550 1.4550
7 7
2000- 2000-
-3000 -3000
30- 30-
-80 -80
25-100 25-100
Einlaufdüse YD 10 Inlet nozzle YD 10
1.4552 1.4552
13 13
7000- 7000-
-9000 -9000
50- 50-
-70 -70
100 100
Einlaufdüse YD30 Inlet nozzle YD30
1.4552 1.4552
15 15
6000 6000
60- 60-
-100 -100
60-100 60-100
Laufrad YD 10 Impeller YD 10
1.4313 1.4313
3 3rd
700 700
25 25th
28 28
Laufrad YD20 Impeller YD20
1.4313 1.4313
2 2nd
700 700
15- 15-
-16 -16
45 45
Laufrad YD40 Impeller YD40
1.4313 1.4313
2 2nd
700 700
25 25th
28 28
Spannscheibe YD 10 Spring washer YD 10
1.4550 1.4550
3 3rd
400 400
2-4 2-4
100-200 100-200
Spannscheibe YD30 Spring washer YD30
1.4550 1.4550
3 3rd
400 400
2-4 2-4
100-200 100-200
Tabelle 2: Dekontamination von Druckhalterheizstabbündel in Biblis (KWB-A) und Borssele (KCB) Table 2: Decontamination of pressure heater bundles in Biblis (KWB-A) and Borssele (KCB)
Dekontergebnis Decontamination result
Anlage Betriebsdauer Komponente Werkstoff Dekontbe- Dosisleistung Dosisleistung DF System Operating time Component Material Decontamination dose rate Dose rate DF
handlung vor nach action before after
(h) (H)
KCB 28 Monate KCB 28 months
Bündel II Bundle II
1.4435 1.4435
10,5 10.5
200-300 200-300
80-300 80-300
7-38 7-38
Bündel III Bundle III
1.4435 1.4435
20,5 20.5
2500-3000 2500-3000
45-300 45-300
8-67 8-67
Bündel IV Bundle IV
1.4435 1.4435
10 10th
3500-6000 3500-6000
50-200 50-200
17-120 17-120
KWB-A 2. Zyklus KWB-A 2nd cycle
Bündel I Bundle I
1.4435 1.4435
11,5 11.5
3000-5000 3000-5000
5-7 5-7
430-1000 430-1000
Bündel III Bundle III
1.4435 1.4435
6 6
500-2000 500-2000
15-20 15-20
10-130 10-130
Tabelle 3 : Dekontamination der Axialpumpen in Brunsbüttel (KKB) sowie des DE-Mannlochdeckels in Gundremmingen Table 3: Decontamination of the axial pumps in Brunsbüttel (KKB) and the DE manhole cover in Gundremmingen
(KRB-I) (KRB-I)
Anlage investment
Betriebsdauer Operating time
Komponente component
Werkstoff material
Dekontbe-handlung Decontamination
(h) (H)
Dekontergebnis Decontamination result
Dosisleistung vor Dose rate before
Dosisleistung nach Dose rate after
DF DF
KKB KKB
192 Tage 192 days
Laufrad P2 Impeller P2
x 6CrNiMo 16.6 x 6CrNiMo 16.6
9 9
6000 6000
50 50
120 120
Laufrad P3 Impeller P3
dito dito
10 10th
1000 1000
15 15
66 66
Laufrad P5 P5 impeller
dito dito
5 5
5000-15000 5000-15000
150-1500 150-1500
10-100 10-100
Laufrad P6 Impeller P6
dito dito
3,5 3.5
20000-45000 20000-45000
200-3000 200-3000
15-100 15-100
Laufradmutter P2 Impeller nut P2
1.4020 1.4020
9 9
300 300
3 3rd
100 100
Lagerdeckel P2 Bearing cover P2
1.4550 1.4550
9 9
700 700
3 3rd
230 230
hydrost. Lager P3 hydrost. Camp P3
1.4122 1.4122
6 6
1000 1000
10 10th
100 100
KRB-I KRB-I
10 Jahre ten years
DE-Mannlochdeckel 1.4301 DE manhole cover 1.4301
18' 18 '
850 850
30-150 30-150
6-28 6-28
Bei den voranstehend aufgezählten Grossdekontaminatio- 55 nen in Kernkraftwerken mussten Teile des Primärsystems dekontaminiert werden, um bei Reparaturarbeiten die störende Strahlenbelastung abzubauen. Bei diesen Dekontaminationen wurden ganze Komponenten sowie Teilbereiche von Systemen dekontaminiert. Leicht demontierbare Teile wurden 60 in externen Wannen durch Tauchen in Bädern behandelt. In the large decontaminations listed above in nuclear power plants, parts of the primary system had to be decontaminated in order to reduce the harmful radiation exposure during repair work. Whole components and parts of systems were decontaminated during these decontaminations. Easily removable parts were treated in external tubs by immersion in baths.
Nicht demontierbare Bereiche des Primärsystems wurden durch Absperrvorrichtungen eingegrenzt und mit Hilfe eines externen Dekontkreislaufes mit Lösung beaufschlagt. Dabei zeigte sich, dass die Nachbehandlung den Dekontaminations- 65 faktor je nach vorliegenden Strukturmaterialien und vorliegender Kontaminationsart ncohmals um den Faktor 5 bis 10 steigern kann. Areas of the primary system that could not be dismantled were delimited by shut-off devices and a solution was applied with the help of an external decontamination circuit. It was found that the post-treatment can increase the decontamination factor by a factor of 5 to 10 depending on the structural materials and the type of contamination.
Da die verbrauchten Dekontaminationslösungen selbst radioaktiv geworden sind, müssen diese zum radioaktiven Abfall gegeben werden. Wichtig ist dabei, dass eine wesentliche Volumenverringerung erzielt wird. Im vorliegenden Fall können die Oxidationslösung und die Dekontaminationslösung zusammengemischt werden, dadurch wird die Oxalsäure zu CO2 oxidiert und das KMnÛ4 zu Mn reduziert. Bei einem Mischungsverhältnis von 1:1 lässt sich eine derartig vorbehandelte Lösung durch Verdampfen um ca. 80% einengen, ohne dass es zu einer Ausfällung von Salzen kommt. Für die Weiterverarbeitung dieses Konzentrats bis zur Endlagerung können dann weitere an sich bekannte chemische und physikalische Verfahren angewendet werden. Since the decontamination solutions used have themselves become radioactive, they must be added to the radioactive waste. It is important that a substantial reduction in volume is achieved. In the present case, the oxidation solution and the decontamination solution can be mixed together, this oxidizes the oxalic acid to CO2 and reduces the KMnÛ4 to Mn. With a mixing ratio of 1: 1, such a pretreated solution can be evaporated by approximately 80% without salt being precipitated. Further chemical and physical processes known per se can then be used for the further processing of this concentrate until final storage.
Claims (9)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782847780 DE2847780C2 (en) | 1978-11-03 | 1978-11-03 | Process for the chemical decontamination of metallic components of nuclear reactor plants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH642475A5 true CH642475A5 (en) | 1984-04-13 |
Family
ID=6053822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH770679A CH642475A5 (en) | 1978-11-03 | 1979-08-24 | METHOD FOR CHEMICAL DECONTAMINATION OF COMPONENTS. |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS601600B2 (en) |
| CH (1) | CH642475A5 (en) |
| DE (1) | DE2847780C2 (en) |
| FR (1) | FR2440601A2 (en) |
| GB (1) | GB2044982B (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1136398A (en) * | 1979-12-10 | 1982-11-30 | William A. Seddon | Decontaminating reagents for radioactive systems |
| US4587043A (en) * | 1983-06-07 | 1986-05-06 | Westinghouse Electric Corp. | Decontamination of metal surfaces in nuclear power reactors |
| US4654170A (en) * | 1984-06-05 | 1987-03-31 | Westinghouse Electric Corp. | Hypohalite oxidation in decontaminating nuclear reactors |
| GB8613522D0 (en) * | 1986-06-04 | 1986-07-09 | British Nuclear Fuels Plc | Technetium decontamination |
| DE3735119A1 (en) * | 1987-04-08 | 1988-10-20 | Genji Okabe | Method for purifying biological matter |
| JP2655325B2 (en) * | 1987-06-04 | 1997-09-17 | 動力炉・核燃料開発事業団 | Decontamination method for reactor plant equipment |
| BE1002593A3 (en) * | 1988-11-09 | 1991-04-02 | Lemmens Godfried | Method for decontamination of radioactively contaminated material |
| DE4131766A1 (en) * | 1991-09-24 | 1993-03-25 | Siemens Ag | Decontamination of nuclear power station prim. cycle to remove metal oxide - by adding chelating agent to prim. coolant to dissolve contaminated oxide |
| RU2124768C1 (en) * | 1996-03-19 | 1999-01-10 | Горно-химический комбинат | Method for decontaminating solid phase of heterogeneous radioactive wastes |
| RU2168780C1 (en) * | 1997-05-08 | 2001-06-10 | Закрытое акционерное общество Инновационная компания "Панорама" | Method for processing metal wastes contaminated with radionuclides |
| JP3977963B2 (en) | 1999-09-09 | 2007-09-19 | 株式会社日立製作所 | Chemical decontamination method |
| RU2197545C2 (en) * | 2001-01-09 | 2003-01-27 | Государственное унитарное предприятие Научно-производственное объединение "Радиевый институт им. В.Г. Хлопина" | Method of dissolving vanadium-chromium-titanium alloy-based structural material of thermonuclear reactor |
| US20040138176A1 (en) | 2002-05-31 | 2004-07-15 | Cjb Industries, Inc. | Adjuvant for pesticides |
| US7476646B1 (en) | 2004-09-27 | 2009-01-13 | Cjb Industries, Inc. | Agricultural promoters/active ingredients |
| DE102009047524A1 (en) * | 2009-12-04 | 2011-06-09 | Areva Np Gmbh | Process for surface decontamination |
| RU2474895C1 (en) * | 2011-10-18 | 2013-02-10 | Федеральное государственное унитарное предприятие "Горно-химический комбинат" | Method of extraction treatment of highly active wastes with fractionation of radioactive nuclides |
| JP5675733B2 (en) * | 2012-09-03 | 2015-02-25 | 三菱重工業株式会社 | Chemical decontamination method |
| EP3254289B1 (en) | 2015-02-05 | 2019-11-20 | Framatome GmbH | Method of decontaminating metal surfaces in a cooling system of a nuclear reactor |
| JP6937348B2 (en) * | 2015-02-05 | 2021-09-22 | フラマトム ゲゼルシャフト ミット ベシュレンクテル ハフツング | How to decontaminate metal surfaces with a reactor cooling system |
| DE102017115122B4 (en) | 2017-07-06 | 2019-03-07 | Framatome Gmbh | Method for decontaminating a metal surface in a nuclear power plant |
| CN115815205A (en) * | 2022-11-29 | 2023-03-21 | 广东核电合营有限公司 | Decontamination device and decontamination method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE292609C (en) * | ||||
| DE2613351C3 (en) * | 1976-03-29 | 1982-03-25 | Kraftwerk Union AG, 4330 Mülheim | Process for the chemical decontamination of metallic components of nuclear reactor plants |
-
1978
- 1978-11-03 DE DE19782847780 patent/DE2847780C2/en not_active Expired
-
1979
- 1979-08-24 CH CH770679A patent/CH642475A5/en not_active IP Right Cessation
- 1979-10-11 GB GB7935287A patent/GB2044982B/en not_active Expired
- 1979-10-25 FR FR7926533A patent/FR2440601A2/en active Granted
- 1979-11-02 JP JP14272279A patent/JPS601600B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2847780A1 (en) | 1980-05-14 |
| JPS5566800A (en) | 1980-05-20 |
| JPS601600B2 (en) | 1985-01-16 |
| DE2847780C2 (en) | 1984-08-30 |
| GB2044982B (en) | 1982-10-13 |
| FR2440601B2 (en) | 1983-01-21 |
| GB2044982A (en) | 1980-10-22 |
| FR2440601A2 (en) | 1980-05-30 |
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| PL | Patent ceased | ||
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