JPH0584898U - Fluid supply nozzle for high temperature container - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a fluid supply nozzle for a high-temperature container, prevents foreign substances from accumulating inside the nozzle, and imparts arbitrariness to the installation direction of the nozzle. [Structure] A nozzle arranged inwardly on the wall of the high-temperature container, a safe end arranged between the nozzle and an internal pipe, and a fluid supply pipe connected to the inner wall of the safe end so as to project outward. The thermal sleeve is provided, and the space between the nozzle and the thermal sleeve is set according to the environment around the high temperature container.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluid supply nozzle for a high temperature container, and more particularly to a technique for supplying a fluid having a temperature difference with respect to a fluid contained in the container into the interior of the container.

[0002]

[Prior Art]

 BACKGROUND ART In nuclear power generation-related plants, various energy-related plants, chemical plants, thermal power generation plants, etc., a fluid having a temperature difference with respect to the internal fluid of a high temperature vessel is supplied to the inside of the vessel.

3 and 4 show an example of a conventional structure of a coolant supply nozzle (fluid supply nozzle) 2 in a reactor pressure vessel (high temperature vessel) 1.

These coolant supply nozzles (hereinafter referred to as fluid supply nozzles) 2 are, for example, a high pressure core spray nozzle, an instrumentation nozzle, a low pressure water injection nozzle, a recirculation water inlet nozzle, and a reactor pressure vessel (hereinafter It is disposed in a body portion 1a of a high temperature container 1) in an outward direction and horizontally.

That is, as shown in FIG. 4, a nozzle 3 disposed outward in the body portion 1 a and a safe end 4 disposed in a connected state between the tip of the nozzle 3 and the fluid supply pipe Q. And a thermal sleeve 5 arranged in a connected state between the inner wall of the safe end 4 and the internal pipe P. With such a structure, when a low temperature fluid is supplied to the internal fluid of the high temperature container 1, the temperature distribution in the length direction and the inner and outer peripheral directions of the nozzle 3 is made gentle, and no thermal stress is generated. I am trying.

[0006]

[Problems to be solved by the device]

 However, in the examples of FIGS. 3 and 4, since the internal fluid of the high temperature vessel 1 is the reactor coolant (reactor cooling water), foreign matter mixed in the internal fluid, for example, radioactive fine particles called clad, When a phenomenon of depositing in the cylindrical hollow portion 6 between the nozzle 3 and the thermal sleeve 5 occurs, the radiation level at that portion rises, and the welded portion r. s. When inspecting t, etc., the radiation dose to workers tends to increase. Further, by setting the orientation of the nozzle 3 so that the inner side of the cylindrical hollow portion 6 is located at the upper position, it is possible to suppress the occurrence of a phenomenon in which foreign matter such as radiation fine particles is accumulated in the cylindrical hollow portion 6. However, the location of the nozzle 3 of the body 1a is easily restricted, and an air pocket (air pocket) is generated at the upper position of the hollow cylindrical portion 6, which adversely affects the heat transfer performance. It can happen.

The present invention has been made in view of such circumstances, and an object thereof is to eliminate the accumulation portion of foreign matter and to give the nozzle a directionality in its setting direction.

[0008]

[Means for Solving the Problems]

 A nozzle disposed inwardly on the wall of the high-temperature container, a safe end connected between the tip of the nozzle and an internal pipe, and an inner wall of the safe end of the high-temperature container through the inside of the nozzle. A fluid supply nozzle for a high-temperature container having a thermal sleeve connected to a fluid supply pipe for supplying a low-temperature fluid arranged in a protruding state to the outside.

[0009]

[Action]

 By arranging the nozzle in the inward position, the cylindrical hollow portion formed by the nozzle and the thermal sleeve is separated from the internal fluid and is connected to the outside atmosphere of the high-temperature container. From the heat transfer to the thermal sleeve is stable. Further, the cylindrical hollow portion is prevented from coming into contact with the fluid inside the high-temperature container, and the phenomenon of foreign matter deposition does not occur.

[0010]

【Example】

 An embodiment in which the fluid supply nozzle for a high temperature vessel according to the present invention is applied to a reactor pressure vessel as in the conventional example will be described below with reference to FIGS. 1 and 2. 1 and 2, reference numeral 11 is a high temperature vessel (reactor pressure vessel), 11a is a high temperature vessel wall (for example, a body), 12 is a fluid supply nozzle (coolant supply nozzle), 13 is a nozzle, and 14 is safe. The end, 15 is a thermal sleeve, and 16 is a cylindrical hollow portion.

Explaining these details, the fluid supply nozzle 12 arranged on the high temperature vessel wall 11 a of the reactor pressure vessel (hereinafter referred to as the high temperature vessel) 11 is disposed inwardly with respect to the high temperature vessel 11. It That is, as shown in FIG. 2, the nozzle 13 in the inward state is attached to the high temperature vessel wall 11a by the welded portion r, and the safe end 14 is provided between the inner end of the nozzle 13 and the internal pipe P. The welded parts s and r are connected to each other, and a thermal sleeve 15 inserted into the hole of the nozzle 13 is attached to the inner wall of the safe end 14. The thermal sleeve 15 extends to the outside of the high temperature container wall 11a. In addition to being projected, the safe end 14 and the fluid supply pipe Q are connected to each other.

With such a fluid supply nozzle for a high temperature container, the atmosphere of the cylindrical hollow portion 16 becomes an air environment near the normal temperature outside the high temperature container 11, and the nozzle 13, the safe end 14, and the internal pipe P are provided. The outer surface of is in the same environment where it contacts the internal fluid of the high temperature container 11. Therefore, the nozzle 13 and the safe end 14 have a high temperature environment on the outer surface side and a low temperature environment on the inner surface side, so that the applied stress based on the temperature distribution and thermal expansion and contraction can be simplified.

<Other Embodiments> In the present invention, the following embodiments can be adopted instead of one embodiment. Set the nozzle 13 in an inward state in any direction such as downward, upward, or diagonal. Set the safe end 14 in an arbitrary shape corresponding to the temperature distribution and thermal stress. The high temperature vessel shall be applied to other than the reactor pressure vessel.

[0014]

[Effect of the device]

 According to the fluid supply nozzle for a high-temperature container according to the present invention, the nozzle is arranged inwardly on the wall of the high-temperature container, the safe end is arranged between the nozzle and the internal pipe, and the outer wall is formed on the inner wall of the safe end. In addition, since the thermal sleeve is provided so as to be protruded and connected to the fluid supply pipe, the following excellent effects are obtained. (1) Since the cylindrical hollow part formed between the nozzle and the thermal sleeve is set according to the external environment of the high temperature container and is isolated from the internal fluid, foreign matter may be mixed into the internal fluid. Even if there is, it is possible to prevent the occurrence of phenomena such as the accumulation of foreign matter. (2) Since the cylindrical hollow portion becomes the external environment atmosphere, the direction of installation of the nozzle in the high temperature container becomes arbitrary, and the fluid supply direction can be freely set. (3) When the internal fluid is the reactor coolant, it is possible to reduce the exposure of workers during periodic inspections.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a fluid supply nozzle for a high temperature container according to the present invention.

FIG. 2 is an enlarged view of a chain line B portion in FIG. 1 in which a circumferential cross section and a vertical cross section are shown together.

FIG. 3 is a front sectional view showing a conventional example of a fluid supply nozzle for a high temperature container.

FIG. 4 is an enlarged view of a portion indicated by a chain line D in FIG. 3 in which a circumferential cross section and a vertical cross section are shown together.

[Explanation of symbols]

 Q Fluid supply pipe P Internal pipe r ・ s ・ t ・ u ・ v Welded part 11 High temperature vessel (reactor pressure vessel) 11a High temperature vessel wall (body) 12 Fluid supply nozzle (coolant supply nozzle) 13 Nozzle 14 Safe end 15 Thermal sleeve 16 Cylindrical hollow part

Claims (1)

[Scope of utility model registration request] 1. A nozzle disposed inwardly on a wall of a high temperature container, a safe end disposed in a connected state between a tip of the nozzle and an internal pipe, and an inside of the nozzle on an inner wall of the safe end. And a thermal sleeve connected to a fluid supply pipe for supplying a low temperature fluid to the outside of the high temperature container in a protruding state via a thermal sleeve.