JPH10227886A - Radiation shield body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize effective shielding performance in reactor operation and make weighing possible in the case of disassembling a radiation shield body by placing a water tank above a turbine and the piping around the turbine body during reactor operation. SOLUTION: By placing a water tank 1 above a turbine body and the piping around the turbine, shielding performance in place of a steel plate can be realized during reactor operation. On the other hand during reactor shutdown, by removing water out of the water tank 1, the shield body is weighed and disassembling of the radiation shield body easily made. Also, load on floor where traditional steel plate radiation shield body is put on after disassembling can be reduced. In the reactor facility, a storage tank and the like for water supply which is not used in reactor operation and used in reactor shutdown as radiation shield body by filling a reactor well with water. This storage tank and the like, which were additionally necessary, can be commonly used for the water tank 1 of radiation shield body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to radiation shielding of turbine equipment of a boiling water reactor facility.

[0002]

2. Description of the Related Art In a conventional radiation shield for a turbine body and a piping around the turbine body, the dose equivalent rate is reduced by using a steel plate 11 around the equipment and the piping as shown in FIGS.

[0003]

In order to obtain effective shielding performance during operation of a nuclear reactor, radiation shielding from the turbine body and the piping around the turbine body, particularly gamma rays, is highly dense and versatile. A steel plate is used as a shield. In addition, at the time of periodic inspection of the turbine body and the like, it is necessary to perform a disassembling operation to remove a steel sheet shield around the equipment and piping.

In recent years, since the distance between the turbine building that houses the turbine equipment and the vicinity of the power plant has been reduced, the shielding performance has been enhanced by further increasing the thickness of the steel sheet to reduce the dose equivalent rate. There is an increasing need to reduce the weight of the shield to make the work easier.

It is an object of the present invention to provide a radiation shield which has an effective shielding performance during operation of a nuclear reactor and which can be reduced in weight when disassembling the radiation shield.

[0006]

In order to achieve the above object, a tank is installed above the turbine body and piping around the turbine during operation of the reactor, and the tank is filled with water to form a radiation shield. .

[0007] By installing a water tank above the turbine body and the piping around the turbine, it is possible to have a shielding performance instead of a steel plate during operation of the reactor. On the other hand, during shutdown of the reactor, the water is removed from the tank to reduce the weight of the shield, and the radiation shield can be easily disassembled. Further, the load on the floor where the conventional steel plate radiation shield is disassembled and temporarily placed can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 2 denotes a turbine body, and reference numeral 3 denotes piping around the turbine. The water tank 1 is a radiation shield installed above these devices and pipes instead of the conventional steel plate radiation shield. Also, a tank 6 and a pump 7 for collecting and supplying water in the water tank 1 are shown.

Another embodiment will be described with reference to FIG. In the figure, reference numeral 8 denotes a storage tank or a storage tank of a water storage facility in a building other than the building that houses the turbine body and the like, around which water in the storage tank is supplied to the reactor well 9. Pump 10.

[0010] The reactor facility is hardly used during the operation of the reactor, and when the reactor is shut down, a water storage tank or storage tank 8 is provided to fill the reactor well with water and use it as a radiation shield. There is. With the configuration shown in FIG. 2, the storage tank or the storage tank 8 that does not need to store water while the reactor is stopped is operated while the reactor is in operation, which requires a shielding body on the turbine body or the like. The water tank 1 around the main body or the like can be used as a substitute to recover and supply water during the operation of the reactor and during shutdown.

[0011]

According to the present invention, the weight of the radiation shield can be reduced and the disassembly is facilitated by collecting the water in the water tank at the time of the periodic inspection.

Since the separately required water storage equipment (storage tank or storage tank) can be shared with the radiation shielding water tank surrounding the turbine body and the like, the conventional water storage equipment (storage tank or storage tank 8) is reduced. Or unnecessary.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a turbine main body and installation of shields around the turbine according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a turbine main body and installation of shields around the turbine according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram in the case of sharing a function with a water storage facility.

FIG. 4 is an explanatory view of a conventional turbine main body and installation of shields around the turbine.

FIG. 5 is an explanatory view of a conventional turbine main body and installation of shields around the turbine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water tank, 2 ... Turbine main body, 3 ... Piping around turbine, 4 ... Support structure, 5 ... Vent, 6 ... Tank, 7, 1
0: pump, 8: storage tank or storage tank, 9: reactor well, 11: steel plate.

Continued on the front page (72) Inventor Mikio Takei 3-2-1 Sachimachi, Hitachi-shi, Ibaraki Prefecture Within Hitachi Engineering Co., Ltd. (72) Inventor Shigenori Ohno 3-2-1 Sachimachi, Hitachi-shi, Hitachi, Hitachi Inside Engineering Co., Ltd.

Claims (1)

[Claims] 1. A radiation shield in a boiling water reactor facility, wherein a water tank is installed above the turbine body and piping around the turbine body during operation of the reactor.