EP2975615A1 - Récipient de transport et/ou de stockage et procédé de vérification de l'étanchéité d'un récipient de transport et/ou de stockage - Google Patents

Récipient de transport et/ou de stockage et procédé de vérification de l'étanchéité d'un récipient de transport et/ou de stockage Download PDF

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Publication number
EP2975615A1
EP2975615A1 EP14177495.0A EP14177495A EP2975615A1 EP 2975615 A1 EP2975615 A1 EP 2975615A1 EP 14177495 A EP14177495 A EP 14177495A EP 2975615 A1 EP2975615 A1 EP 2975615A1
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EP
European Patent Office
Prior art keywords
container
test
seal
pressure
transport
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.)
Withdrawn
Application number
EP14177495.0A
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German (de)
English (en)
Inventor
Roland Hüggenberg
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.)
GNS Gesellschaft fuer Nuklearservice mbH
Original Assignee
GNS Gesellschaft fuer Nuklearservice mbH
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 GNS Gesellschaft fuer Nuklearservice mbH filed Critical GNS Gesellschaft fuer Nuklearservice mbH
Priority to EP14177495.0A priority Critical patent/EP2975615A1/fr
Publication of EP2975615A1 publication Critical patent/EP2975615A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/06—Details of, or accessories to, the containers
    • G21F5/12—Closures for containers; Sealing arrangements
    • 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
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/06—Details of, or accessories to, the containers
    • G21F5/12—Closures for containers; Sealing arrangements
    • G21F5/125—Means to monitor or detect the leak-tightness of the closure

Definitions

  • the invention relates to a transport and / or storage container for receiving radioactive waste, - with container lid, container casing and container bottom and with a container lid, container casing and container bottom surrounded container interior, wherein between the container lid and the container casing at least one main seal is arranged.
  • the invention further relates to a method for checking the tightness of a transport and / or storage container for radioactive waste, wherein the tightness of the arranged between the container lid and the container shell of the container main seal is checked.
  • transport and / or storage container shortened here and below the term container is used.
  • Containers of the type mentioned are known from practice in various embodiments.
  • methods for checking the tightness of the main seal between the container lid and the container casing are also known.
  • the main seal is a safety-related component of the tight enclosure of the container and this main seal is to ensure the tightness of the container.
  • the tightness of the main seal must normally be checked after the container has been manufactured, after it has been loaded, as well as in the case of recurrent leak tests and even after several years of storage of the container.
  • a misjudgment can also occur, in particular in the case of a negative pressure or vacuum in the test volume, in that outgassing of air present in the elastomer or of gases present in the elastomer takes place in the case of seals consisting of elastomer materials. This effect is important because of the higher gas solubility of low temperature elastomeric materials. The outgassing can affect the pressure change in the test volume, so that even the leakage rate of the main seal can not be reliably detected.
  • the invention is the technical problem of specifying a transport and / or storage container of the type mentioned, in which the above problems with the leak test can be avoided. Furthermore, the invention is the technical problem underlying a Specify a method for checking the tightness of the container, in which the tightness can be determined as accurately as possible and reproducible.
  • the invention first teaches a transport and / or storage container for radioactive waste, - with container lid, container casing and container bottom and with a container lid, container casing and container bottom surrounded container interior, wherein at least one main seal is disposed between the container lid and container shell, wherein between the container lid and the container casing at least one test seal is present or interposed, wherein between the main seal and the test seal a test volume between the container lid and container shell is formed and wherein the test seal seals the test volume to the outside or outside of the container / container lid, wherein at least one pressure measuring device is present, which is connected to the test volume or can be connected and wherein the pressure measuring device a pressure change or a pressure increase is measurable, which pressure change or pressure increase due to a generated in the container interior for the leak test pressure in the test volume results.
  • an overpressure in the container interior is artificially produced, as it were, for the tightness test, whereby this overpressure deviates from the normal pressure conditions in the container interior or in the loaded container interior.
  • the pressure in the test volume between the main seal and test seal corresponds to the ambient pressure in the outer environment of the container or approximately the ambient pressure in the outer environment of the container. It is also within the scope of the invention that after the generation of the overpressure in the container interior for the leak test, the change in pressure over time in the test volume is measured. Expediently, the temperature or any change in the temperature during the measurement period is also measured, so that the measured pressures can be normalized to standard conditions at 20 ° C. On the basis of the temporal pressure change or the time pressure increase in the test volume can be concluded on the quality or tightness of the main test.
  • the invention is based on the finding that in this way functionally reliable and error-free and reproducible the tightness of the main seal can be determined.
  • the invention is further based on the finding that the driving pressure difference between the test volume and the external environment is initially zero or virtually zero and increases only slightly over time. Therefore, the gas flow or mass flow through the test seal, regardless of the quality of the test seal is relatively small and practically negligible.
  • the main seal rotates over the container circumference and is expediently designed as a main sealing ring running around the circumference of the container.
  • the main seal or the main sealing ring is designed as an elastomeric seal.
  • the main seal or the main sealing ring consists of at least one elastomeric material.
  • the main seal ensures the tightness of the container and thus this main seal is a safety-relevant component of the container.
  • the test seal is expediently only for leak testing of the main seal.
  • test seal rotates over the container circumference and is preferably designed as a test seal ring which rotates over the container circumference.
  • test seal or the excdichtungsring is designed as an elastomeric seal.
  • the test seal or excdichtungsring consists of at least one elastomeric material or substantially of at least one elastomeric material.
  • a recommended embodiment of the invention is characterized in that the main seal and / or that the test seal consists of at least one material or elastomer material from the group "fluororubber (FKM), silicone, ethylene-propylene-diene rubber (EPDM)" essentially exists.
  • FKM fluororubber
  • EPDM ethylene-propylene-diene rubber
  • both the main seal and the test seal are made of a fluororubber (FKM) as elastomer material.
  • the pressure change or pressure increase after generation of the overpressure in the container interior is measured in the test volume between the main seal and the test seal.
  • a pressure measuring device is suitably connected to the test volume.
  • the test volume preferably has a value of 70 to 200 ml, preferably of 80 to 150 ml and for example a value of about 100 ml. This volume value refers to the pure test volume between main seal and test seal without consideration of connected to the test volume connection holes or connection openings for the pressure measuring device.
  • the test volume is formed as a test gap between the container lid and container casing between the main seal and the test seal.
  • the main seal between a vertical or substantially vertical wall of the container lid and a vertical or substantially vertical wall of the container shell is arranged.
  • the term vertical refers here and below to the vertical set-up of the container with downwardly oriented container bottom and upwardly oriented container lid.
  • the main seal is received in a formed in the wall of the container lid and / or in the wall of the container jacket receiving groove. It is within the scope of the invention that the main seal protrudes into a narrow vertical space between the vertical wall of the container lid and the vertical wall of the container shell.
  • the test seal is arranged between a horizontal or substantially horizontal wall of the container lid and a horizontal or substantially horizontal wall of the container jacket.
  • the term horizontal also refers here and below to the already described vertical erecting state of the container.
  • the test seal is received in a formed in the wall of the container lid and / or in the wall of the container jacket receiving groove. It is within the scope of the invention that the test seal protrudes into a narrow horizontal space between the horizontal wall of the container lid and the horizontal wall of the container shell.
  • the test volume on a vertical or a substantially vertical is expediently designed in the form of an L-shaped test gap between the container lid and the container casing. It is within the scope of the invention that the test volume or the test gap in the vertical installation state of the container has the shape of an inverted "L".
  • test hole it is recommended that at least one test hole is passed through the container lid, this test hole is in communication with the test volume. Conveniently, this test hole is connected to the pressure measuring device for measuring the pressure change or pressure increase in the test volume. It is within the scope of the invention that the test hole between the main seal and the test seal opens into the test volume.
  • connection bore gas can be introduced to generate the overpressure in the container interior.
  • connection bore gas can be introduced to generate the overpressure in the container interior.
  • air and / or nitrogen is expediently introduced to increase the pressure or to generate excess pressure in the container interior.
  • the generation of the overpressure is expediently carried out by means of at least one pumping device.
  • the invention further teaches a method for checking the tightness of a transport and / or storage container for radioactive waste, wherein the tightness of at least one arranged between the container lid and the container shell of the container main seal is checked by in the container interior of the container specially for this leak test, an overpressure is applied and wherein Subsequently, a pressure change or pressure increase taking place on the side of the main seal facing away from the container interior is measured and the test volume is limited by the main seal on the one hand and by the test seal on the other hand. It is, moreover, within the scope of the invention that the test volume adjoins or connects directly to the main seal and to the test seal.
  • the pressure is recommended to correspond to the normal pressure or preferably a maximum of 1.3 bar. It is within the scope of the invention that the pressure in the test volume before the measurement of the leak test and before the application of the overpressure in the container interior is significantly below this overpressure. According to a particularly preferred embodiment of the invention, the pressure in the test volume before the measurement of the leak test and before the application of the overpressure in the container interior corresponds to the external ambient pressure of the container, in particular a normal pressure of about 1 bar.
  • the pressure in the test volume usually increases and the change of this pressure in the test volume with time is measured according to the invention.
  • this measurement is carried out as a continuous pressure measurement.
  • the temperature in the test volume is also measured during the measurement period, so that the measured pressures can be normalized to standard conditions at 20 ° C.
  • a measurement according to the invention of the pressure change or of the pressure rise in the test volume is expediently carried out as follows: Container interior via a connection hole in the container lid an overpressure of, for example, 4.5 bar adjusted, which pressure then rests against the inside of the main seal. Until then, both the test volume between the outside of the main seal and the inside of the test seal and on the outside of the test seal or in the outer area of the container, the stationary ambient pressure of about 1 bar. Subsequently, the temporal pressure change or the time increase in pressure in the test volume is measured. Since the driving pressure difference between the test volume and the external environment of the container is initially zero and only slightly increases during the measurement, the mass flow through the test seal to the outside is small and practically negligible regardless of the quality of the test seal. A pressure change in the test volume is thus essentially caused by the driving pressure difference across the main seal. Thus, the pressure change measured in the test volume in the time interval can be unambiguously assigned to the main seal as a leakage rate.
  • the invention is based on the finding that in the tightness test according to the invention the tightness or the leakage rate of the main seal can be reliably, precisely and reproducibly determined. Pressure changes that could give rise to misinterpretations are almost completely excluded in the leakage test according to the invention. For example, any pressure changes due to outgassing from the elastomer seals no longer play a role. In that regard, the leakage test according to the invention is much more reliable than the known from practice tightness checks of seals. It should also be emphasized that the components required for the container according to the invention or for the test according to the invention are relatively inexpensive and inexpensive. Also, the inventive method for leak testing can be done in a simple and inexpensive way. As already emphasized, incorrect evaluations or incorrect measurements can be almost completely ruled out.
  • the figures show a transport and / or storage container according to the invention for the reception of radioactive waste, not shown.
  • the container has a container lid 1, a container casing 2 and a container bottom 3. From the container lid 1, the container casing 2 and container bottom 3, a container interior 4 is surrounded. Between the container lid 1 and the container casing 2 a preferably and in the embodiment over the circumference of the container circumferential main seal 5 is arranged.
  • This main seal 5 is intended to ensure the tightness of the container interior 4 and therefore forms a safety-relevant component of the container according to the invention.
  • Empfohlene866 and in the embodiment, this main seal 5 is designed as a main sealing ring made of an elastomer material.
  • the elastomeric material may be fluororubber (FKM).
  • test seal 6 is present between the container lid 1 and the container jacket 2, wherein the test seal 6 preferably and in the exemplary embodiment also rotates over the circumference of the container.
  • the test seal 6 is formed as sketchdichtungsring of an elastomeric material.
  • the elastomer material of the test seal 6 may also be a fluororubber (FKM).
  • FKM fluororubber
  • the test volume 7 may have an amount of about 100 ml. In this case, this amount refers only to the test gap between the container lid 1 and the container casing 2 and not to a below-mentioned test bore 17 for measuring the pressure change in the test gap or test volume. 7
  • the main seal 5 between a vertical wall 11 of the container lid 1 and a vertical wall 12 of the container shell 2 is arranged.
  • the main seal 5 is preferred and received in the embodiment in a circumferential over the circumference of the container receiving groove 19 of the container lid 1.
  • the main seal 5 thus seals a vertical intermediate space or intermediate gap between the container lid 1 and the container jacket 2, as it were.
  • the test seal 6 between a horizontal wall 13 of the container lid 1 and a horizontal wall 14 of the container shell 2 is arranged.
  • the test seal 6 is received in a arranged in the horizontal wall 13 of the container lid 1 and preferably encircling the circumference of the container receiving groove 20.
  • test seal 6 thus seals as it were a horizontal gap or intermediate gap between the container lid 1 and container shell 2 from.
  • the test volume 7 has a vertical sketchspaltabites 15 and a horizontal sketchspaltabites 16, wherein the two strigspaltabitese 15, 16 between the container lid 1 and container shell 2 are arranged.
  • the test gap is formed as an L-shaped test gap, and indeed has the test gap in the vertical installation state of the container in the figures in the form of an inverted "L".
  • test bore 17 is guided through the container lid 1, wherein the test bore 17 is in fluid communication with the test volume 7. It is furthermore within the scope of the invention that a pressure measuring device 9 for measuring the pressure or for measuring the pressure change in the test volume 7 is connected to the test bore 17.
  • the test hole 17 opens between the main seal 5 and test seal 6 in the test volume. 7
  • an overpressure is applied according to the invention in the container interior 4 of the container, this overpressure being for example 4 bar.
  • the overpressure is thus well above the ambient pressure on the outside of the container.
  • a connection bore 18 in the container lid via which connection bore 18, a gas, in particular air, can be pumped into the container interior 4 to generate the overpressure. It is within the scope of the invention that prior to the generation of the overpressure in the container interior 4 in the test volume of the ambient pressure or quasi the ambient pressure is applied to the outside of the container.
  • Test volume 7 After application of the overpressure in the container interior 4 can then be a pressure change or pressure increase in Test volume 7 are measured, and expediently with the connected to the test hole 17 pressure measuring device 9.
  • the pressure increase in the test volume 7 is measured as a function of time. Appropriately, the temperature in the test volume 7 is determined in this time interval.
  • such a leak test or such a measurement of the pressure increase in the test volume 7 after generation of an overpressure in the container interior 4 can take place at different times, for example immediately after the manufacture of the container, after the loading of the container and / or at periodic leak tests and / or after storage of the container for several years. It has been found that such a tightness test can be carried out very precisely and functionally reliable as well as reproducibly by the method according to the invention. Misinterpretations of the measurement results are virtually eliminated.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Examining Or Testing Airtightness (AREA)
EP14177495.0A 2014-07-17 2014-07-17 Récipient de transport et/ou de stockage et procédé de vérification de l'étanchéité d'un récipient de transport et/ou de stockage Withdrawn EP2975615A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14177495.0A EP2975615A1 (fr) 2014-07-17 2014-07-17 Récipient de transport et/ou de stockage et procédé de vérification de l'étanchéité d'un récipient de transport et/ou de stockage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14177495.0A EP2975615A1 (fr) 2014-07-17 2014-07-17 Récipient de transport et/ou de stockage et procédé de vérification de l'étanchéité d'un récipient de transport et/ou de stockage

Publications (1)

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EP2975615A1 true EP2975615A1 (fr) 2016-01-20

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EP14177495.0A Withdrawn EP2975615A1 (fr) 2014-07-17 2014-07-17 Récipient de transport et/ou de stockage et procédé de vérification de l'étanchéité d'un récipient de transport et/ou de stockage

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EP (1) EP2975615A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018186951A1 (fr) * 2017-04-06 2018-10-11 M Downey Exploration LLC Procédé et système de stockage et de surveillance de déchets nucléaires

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4274007A (en) * 1979-02-10 1981-06-16 GNS Gesellschaft fur Nuklear-Service mbH Radiation-shielding transport and storage vessel
US6223587B1 (en) * 1997-07-24 2001-05-01 Transnucleaire Device and method for permanently controlling the tightness of closing lids of containers for radioactive materials
US6349947B1 (en) * 1999-06-23 2002-02-26 Mve, Inc. High pressure chamber door seal with leak detection system
JP2003279690A (ja) * 2002-03-25 2003-10-02 Mitsubishi Heavy Ind Ltd 密封能力維持機能付きキャスク

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4274007A (en) * 1979-02-10 1981-06-16 GNS Gesellschaft fur Nuklear-Service mbH Radiation-shielding transport and storage vessel
US6223587B1 (en) * 1997-07-24 2001-05-01 Transnucleaire Device and method for permanently controlling the tightness of closing lids of containers for radioactive materials
US6349947B1 (en) * 1999-06-23 2002-02-26 Mve, Inc. High pressure chamber door seal with leak detection system
JP2003279690A (ja) * 2002-03-25 2003-10-02 Mitsubishi Heavy Ind Ltd 密封能力維持機能付きキャスク

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018186951A1 (fr) * 2017-04-06 2018-10-11 M Downey Exploration LLC Procédé et système de stockage et de surveillance de déchets nucléaires
US10115490B1 (en) 2017-04-06 2018-10-30 Mwd-Ip Holdings, Llc Method for nuclear waste storage and monitoring
US10381122B2 (en) 2017-04-06 2019-08-13 Mwd-Ip Holdings, Llc System for nuclear waste storage and monitoring
AU2018249920B2 (en) * 2017-04-06 2020-04-16 Mwd-Ip Holdings, Llc Method and system for nuclear waste storage and monitoring

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