Patent Number: 
Section: claims

1. A sealing element fastening system for at least one sealing element for a pressure vessel having at least one opening, the sealing element fastening system comprising:a sealing part being a cover for the at least one opening, said sealing part having an accommodating groove formed therein for said at least one sealing element, wherein,in an operating state of the pressure vessel, said at least one sealing element is at least partially inserted in said accommodating groove;said sealing part having indentations formed therein, said indentations each having a respective sealing element fastening device disposed therein; and said indentations each being sealed by a respective fill element in the operating state of the pressure vessel, said fill element occupying a majority of a space within said indentation, and said fill element being in sealing engagement against a surface of the pressure vessel for blocking a potential flow of fluid into said indentation. 2. The system according to claim 1, wherein each said respective sealing element fastening device has a ring-shaped holding element with an integrally molded holding arm, and is fixed to said sealing part in the operating state of the pressure vessel. 3. The system according to claim 2, wherein in the operating state of the pressure vessel, said integrally molded holding arm engages into a recess on said at least one sealing element and fixes said at least one sealing element on said sealing part. 4. The system according to claim 3, wherein:said sealing part has a respective complementary counter thread at each of said indentations; andeach said respective sealing element fastening device has a bolt nut and a threaded bolt with two separate threaded portions including a first threaded portion and a second threaded portion, said first threaded portion passes through said ring-shaped holding element in the operating state of the pressure vessel and is screw-connected into said respective counter thread, said second threaded portion passes through said fill element in the operating state of the pressure vessel and accommodates said bolt nut as a fixing device for said fill element. 5. The system according to claim 4, wherein each said respective sealing element fastening device has a ring-shaped projection disposed between said first and second threaded portions and functioning as a stop member for said fill element and for said holding element. 6. The system according to claim 5, wherein said ring-shaped projection has a number of recesses formed therein functioning as a point of application for a tool. 7. The system according to claim 6, wherein said bolt nut has a number of further recesses formed therein, which in form and relative position to each other are identical to said recesses on said ring-shaped projection, said further recesses function as a point of application for the tool. 8. The system according to claim 3,wherein said fill element has a respective central opening formed therein; anda clamping bush is provided through each said holding element and is pressed into said central opening in said fill element for a rotational fixing of said holding element on said fill element. 9. The system according to claim 8, further comprising a fastening screw penetrating said fill element, said holding element and said clamping bush, in the operating state of the pressure vessel, said fastening screw being screw-connected into a complementary counter thread formed in said sealing part. 10. The system according to claim 1, wherein said sealing part is a cover. 11. A pressure vessel, comprising:at least one sealing element;a sealing element fastening system for said at least one sealing element, said sealing element fastening system including;a sealing part being a cover for an opening in a pressure vessel, said sealing part having an accommodating groove formed therein for said at least one sealing element, wherein,in an operating state of the pressure vessel, said at least one sealing element is at least partially inserted in said accommodating groove;said sealing part having indentations formed therein, said indentations each having a respective sealing element fastening device disposed therein; andsaid indentations each being sealed by a respective fill element in the operating state of the pressure vessel, said fill element occupying a majority of a space within said indentation, and said fill element being in sealing engagement against a surface of the pressure vessel for blocking a potential flow of fluid into said indentation. 12. The pressure vessel according to claim 11, wherein the pressure vessel is a reactor pressure vessel.