Patent Number: 
Section: claims

1. A pipeline shut-off device comprising:a pipe section configured to be arranged in a pipeline;a shut-off member disposed in the pipe section; anda device arranged in the region of the pipe section and actuable from outside of the pipe section, the device being operable to destroy the shut-off member when the device is actuated from the outside of the pipe, the device including:a housing on the periphery of the pipe section of the pipeline shut-off device;a striker movably supported in the housing;at least one spring engaging the striker;a tensile element attached to and holding the striker in a preloaded position against a load of the at least one spring; andwherein the tensile element is generally axially aligned to the striker. 2. A pipeline shut-off device in accordance with claim 1, wherein:the shut-off member is a plate. 3. A pipeline shut-off device in accordance with claim 2, wherein:the plate is peripherally let into the pipe section. 4. A pipeline shut-off device in accordance with claim 2, wherein:the plate is sealed to the pipe section by a peripheral seal disposed on a perimeter face of the plate. 5. A pipeline shut-off device in accordance with claim 2, wherein:the plate has at least one peripheral seal at least on one side in the axial direction of the pipe section. 6. A pipeline shut-off device in accordance with claim 1, wherein:the shut-off member is manufactured from a brittle material. 7. A pipeline shut-off device in accordance with claim 6, wherein:the shut-off member is manufactured from a glass, a glass-like material or a ceramic material. 8. A pipeline shut-off device in accordance with claim 1, wherein:the tension element is a rope, a chain or similar. 9. An apparatus for the emergency supply of coolant to the fuel rods arranged in a reactor vessel of a nuclear power plant on an incipient core meltdown, comprising:a vessel for receiving coolant, the vessel being connected to a reactor vessel by at least one pipeline; anda pipeline shut-off device in accordance with claim 1. 10. An apparatus in accordance with claim 9,wherein the tensile element is melted on an incipient core meltdown by the temperature arising in this process.