JPS58223784A - Heat resister of reactor container plug - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an improved thermal resistor C1 attached to the lid of the reactor volume upper opening of a liquid gold cooled fast reactor.

(Description of Prior Art) The above kI- reduces the amount of heat released from inside the reactor vessel,
In addition, there is a need for a function to maintain the upper surface temperature of the lid at room temperature.

Conventionally, for this purpose, heat resistors were placed inside the lid, or the inside of the lid was forced to cool. However, the surrounding members of various heat resistors in a part of Rinnai are strong members that are loaded with their own weight and earthquake resistance.

And it is manufactured in one piece in almost the same shape as the horizontal shape of the lid,
Since it supports a fairly heavy object, the thickness of the surrounding member becomes thick, and heat transfer from the surrounding member hinders the reduction of the amount of heat radiation. Furthermore, due to the need to reduce the thermal stress of the surrounding member, the vertical temperature gradient had to be reduced, and the height of the thermal resistor could not be lowered.
The height of the lid was increased by 5.

(Objective of the Invention) The present invention has been made in response to the above-mentioned situation C2, and the thermal resistor has a divided structure, and the thermal resistor surrounding member is made thinner, so that the heat resistor is low in height and has little heat leakage. DESCRIPTION OF THE PREFERRED EMBODIMENTS (Structure of the Invention) The present invention will be described in detail below with reference to the drawings of one embodiment.

Figure 1 is a longitudinal sectional view of a nuclear reactor structure showing the place where the present invention is applied. In Figure 1, % turnip (1) is sodium (2)
and cover gas (8) (usually argon gas is used).

) inside the reactor vessel (marked 1 at the top of the sword. In addition, #i reactor core (5) is arranged in the center of the reactor vessel (4). ;1. Bottle lid (1
) No. 2 There are mounting holes on the entire bottom surface, divided into two parts of commercial size.

2 is a longitudinal sectional view of the thermal resistor (0) in FIG. 1, and FIG. 3 is a view taken along the line A--A in FIG. 2. As shown in the figure, the thermal resistor (6) has an upper plate αη and a lower plate Akira, which are held by several rods 08+ to keep the distance between them constant. The planar shape of the plate U21 has almost the same dimensions, and the flexible thin film (4
) is surrounded by. Upper plate (ill), lower plate (1
The inside surrounded by the thin film Q and the insulation layer is
There are people. An upper plate IJI) and a lower plate (1 plow 1 is the center position 2 is the hanging pole) are provided. Hanging bolt (
26), the heat resistor (6) is attached to the bottom surface of the lid (υ through a screw connection 52. The rod (18) is a hanging bolt) (
The circumference H8 of 1 (1) is arranged to make the pinch circle diameter as small as possible. The upper surface and front of the upper plate α1) (
The bottom surface of 1) is in close contact with the bottom surface due to the bolt tightening force. The own weight of the Peng Netsuzai 05) is applied to the lower plate (121), and the horizontal load during an earthquake is the upper and lower plates and the rod [8] *Hanging pole) (
16) is subjected to two loads, and no external load other than the thin film's own weight is applied to the thin film C14).

Rod 1181, hanging pole) (161% upper plate Oυ, lower plate 0υ and thin! +14J is manufactured from a metal material with excellent heat and corrosion resistance, such as austenitic stainless steel #7.

Next, the present invention will be explained in detail. The thickness of the thin film is:
It can be determined based on the balance between the thickness that can withstand thermal resistance v', fluid pressure inside and outside the body, and earthquake load f2, and the thickness determined from the structural soundness with respect to temperature D, but it should be made quite thin for the following reasons. be able to.

In other words, in the case of a fast reactor, the reactor upper cover gas pressure is generally 1 atm8°, the temperature is about 500° C., and the running pressure inside and outside the thermal resistor is not so large. In addition, other vehicles affected by the earthquake that are negative (jJ) on the thin film 04) fall in a direction opposite to the thin film shell.

The heat transfer inside the heat resistor ((1) is roughly divided into two types: one through the thin film 04, which is made of moss), the rod (18), and the suspension bolt, and the other through the insulation layer. However,
Since the thin film thickness can be made considerably thinner for the above reasons, the ratio of the cross-sectional area of the metal part (the cross-sectional area in the direction perpendicular to the direction in which thermal resistance is considered) to the cross-sectional area of the thermal resistor metal can be reduced. can be made significantly smaller than before. Furthermore, since the heat transfer from the heat insulating part (5J) can be significantly smaller than that from the metal part, the heat transfer amount of the thermal resistor (6) can be significantly reduced compared to the conventional C2. Become.

Next, the size of the thermal resistor (15), the hanging bolt (161s persimmon (18)) at the center of the upper plate (11) and the lower plate (121) will be sufficient for strength. Pol)
, (16) and the thickness of the bar O are easy to select. Therefore, the upper plate χ11) due to the vertical temperature gradient
Hanging bolt '06 based on the difference in thermal deformation between
) s s (The forced displacement force to 18+ is hardly applied to #1. For this reason, it is possible to create a larger vertical and vertical temperature gradient in the thermal resistor than in the past.

(Effects of the Invention) As explained above, the heat resistor for the two-button C type can reduce the height of the heat resistor and the reactor lid if it maintains the same level of thermal performance as the conventional one. , property damage can be reduced. ) Also, if the height of the reactor lid is kept at the same level as before, the height of the strength section can be lowered by the lower height of the thermal resistor section, which makes the height of the reactor lower than before. Strength can be increased. Further, the reduction in the height of the thermal resistor improves the earthquake resistance of the thermal resistor portion. Furthermore, improving the thermal performance of the thermal resistor can reduce heat radiation from the reactor vessel lid, reduce the amount of forced cooling layer inside the reactor, and lower the temperature of the upper surface of the reactor. Also becomes iiJ Noh.

[Brief explanation of drawings]

Fig. 1 is a schematic vertical cross-sectional view of a liquid metal cooled fast reactor vessel to which a thermal resistor according to embodiment C of the present invention is applied, and Fig. 2 is an enlarged cross-sectional view of the thermal resistor shown in Fig. m1. 3 is a view taken along the line A--A in FIG. 2. (1)...Reactor vessel lid (4)...Reactor cover (6)...Thermal resistor (111...Top plate (old)
・Bottom plate (18) ・Bar 0 phrase ・Thin film (same ・Insulating material (10) ・Hanging bolt (7317) Agent Patent attorney Kensuke Chika (and 1 other person) No. 1 figure

Claims (2)

[Claims] (1) A reactor vessel containing liquid gold 6, a reactor vessel lid for sealing this reactor vessel, and a split structure upper plate installed in close contact with the lower surface of this reactor vessel lid, This upper plate [2] is provided with a plurality of lower plates facing each other, several rods that maintain a constant distance □ between the upper plate and the lower plate, and 4 facing
A flexible thin film connects the outer peripheries of the upper plate and the lower plate, and a heat insulating layer surrounded by this thin film and held so as not to load the thin film with mechanical stress, and a A thermal resistor for a reactor vessel lid, comprising: and (c) a hanging bolt that passes through a hole arranged in the center of the lower plate and attaches the upper plate and the lower plate to the reactor vessel lid. (2) The thermal resistor for a reactor vessel lid according to claim 1, wherein the upper plate, lower plate, rod, hanging bolt, and thin film are made of austenitic stainless steel.