Closure method for external hole of nuclear power plant building

Abstract

The invention discloses a nuclear power plant building outer hole plugging device and a plugging method. The plugging device comprises a plugging plate, a rotary positioning mechanism and a sensor. The plugging plate is arranged in an outer hole in a pivot mode through the rotary positioning mechanism. The sensor monitors temperature and pressure in a nuclear power plant building and transmits monitored results to the rotary positioning mechanism, the rotary positioning mechanism drives the plugging plate to rotate according to the received results monitored by the sensor, and accordingly adjustment of the opening and closing states and opening angles of the plugging plate is achieved. The plugging method includes the steps that the plugging device is arranged in the outer hole, and the opening and closing states and the opening angles of the plugging plate are adjusted according to sensing signals of the sensor. Compared with the prior art, the device and the method can effectively guarantee that the nuclear power plant building can meet requirements for heat preservation and ventilation of inner systems and devices on normal work conditions and can meet the decompression requirements of the inner systems and the devices when pipelines break or on special work conditions, and technical support is provided for safe and stable operation of a nuclear power plant.

Description

technical field [0001] The invention relates to the field of nuclear power construction, and more specifically, the invention relates to a plugging device and a plugging method for external holes of a nuclear power plant used in cold regions. Background technique [0002] see figure 1 , the nuclear power plant has the characteristics of complex system and numerous pipelines, so its plant 10 often has various external holes 14 due to the passage of different items; at the same time, radiation shielding, fire protection, pressure bearing, ventilation and other operating requirements are also required for different There are strict requirements on the plugging of the external hole 14 . [0003] For the factory building 10 in the cold northern region, due to the large temperature difference between indoor and outdoor in winter, and the three functional requirements of heat preservation, ventilation, and pressure relief, the problem of sealing the external hole 14 is particularl...

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Problems solved by technology

For example: for pressure piping systems such as the main steam pipeline (VVP) 12 exposed in the factory building 10, it needs to block the external hole 14 to maintain the temperature in the room in winter, but it requires opening part of the plugged hole 14 in summer , so as to ensure that the temperature in the room is not higher than the high temperature limit of equipment and instrument operation through natural ventilation and meet the requirements of personnel maintenance; on the other hand, after sealing the external hole 14 in winter, the originally open space will be closed, so After the rupture accident of the main steam / main water supply pipeline, the overpressure calculation boundary conditions of the connecting plant 10 will change, and it is necessary to consider meeting the pressure relief requirements caused by the pipeline rupture under accident conditions

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