JPS5987394A - Overflow structure in reactor container - 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 This invention relates to the A-puff flow structure of a liquid metal cooled fast breeder reactor in 1!1.

Liquid metal cold 1117:! In a J-fast breeder reactor, a low-temperature coolant may be flowed along the inner surface of the reactor vessel in order to keep the reactor vessel at a low temperature. 1' However, in a loop-type 1MFBR (liquid metal cooled fast breeder reactor) that incorporates the conventional reactor wall cooling method, as shown in Figure 1, the reactor vessel 1
, a shielding plug 3 , a reactor core 4 , and a core upper machine 415 are provided, and a reactor wall cooling live-6 is provided along the inside of the reactor vessel 1 , and an annular cooling liner 6 is provided between the reactor vessel 1 and the reactor wall cooling liner 6 . A flow path 7 consisting of a gap is provided, through which the low-temperature plastics 1 to 2 of the lower plenum 8 are passed and flowed out to the high-temperature upper plenum 11. Also, the cold IJ in the upper plenum 11
The A-puff flow tube 12 is opened at a position that defines the J material liquid level, thereby keeping the I and Lium levels in the reactor vessel 1 constant. The overflowing sodium passes through the overflow pipe 12 and is temporarily transferred to the A-buffer tank (7 as shown).
9) and returned to the reactor vessel 1 through the pump 1 burnt pipe 10 by a pump (not shown). By the way, in the conventional A-baffle one-way system, the high-temperature pump in the upper plenum exceeds 70 degrees.
- Overpuff [] including the buffflow tank - There is a problem that the entire system becomes high temperature and it is easy to separate the stages to <K.Also, while the reactor vessel wall is kept at a low temperature, the orbaflow piping and pumping piping The area where the overflow piping and pumping piping penetrate the reactor vessel wall (
There is a problem that large thermal stress due to the temperature difference between the reactor vessel wall and the piping occurs in the nozzle part, making the design difficult, and countermeasures are needed to address these problems.

This invention was made in view of the circumstances as described in "-", and it is possible to make the entire delta-buffer flow system relatively low temperature, thereby making it easier to stage the overflow piping and pumping. In the part where the piping penetrates the reactor vessel (i.e., the nozzle part), the difference in quality between the vessel and the piping is reduced compared to the conventional method, and thermal stress is kept low. Parts []-
Something whose purpose is to fabricate the structure.

Corresponding to this purpose, the A-Puff ml of the present invention (4M)
The plan was to install a reactor wall cooling pipe along the reactor vessel wall to form a flow path for cooling the reactor wall, and to connect the upper blennium with one hole through the communicating hole. Buckets 1~ having an internal space communicating with each other are provided, and configured so that the reactor wall cooling purpose flowing out from the navigation channel flows into the buckets 1~, and the liquid level in the packets is It is characterized by an opening of an overpuff [Ko tube] at a position that determines the

The details of this invention will now be described with reference to one embodiment and the drawings.

In FIGS. 2, 3, and 4, reference numeral 1 indicates a ml sub-reactor vessel, and a reactor wall cooling liner 6 is provided inside the reactor vessel 1 along the reactor vessel wall. A flow path 7 consisting of an annular gap is formed between the two. The lower end of this flow path 7 opens into the lower plenum 8, and the upper end opens into the upper plenum 11, forming a cooling flow path that does not pass through the core 4.

There is a bucket inside the upper plenum 11 inside the furnace wall cooling liner 6! - The wall 13 forms the bucket 1 to the inner plenum 14. Plenum 14 in the packet includes buckets 1 to walls 13
However, a communication hole 15 is formed through the lower end of the bucket 1 to the wall 13, and the intra-packet plenum 14 and the upper plenum 11 communicate with each other through the communication hole 15. ing. Furnace wall cooling liner 6
The height of the coolant in the upper plenum 11 (16
slightly higher than the height determined. Plenum 1 in the packet
An opening 17 of the overflow pipe 12 opens at a position that determines the liquid level in the overflow pipe 12.

In the reactor vessel overflow structure configured in this way, the liquid metal coolant is first supplied to the lower plenum 8,
Most of it passes through the core 4, during which time the core 4
The heat is received from and reaches the upper plenum 11. On the other hand, a portion of the coolant supplied to the lower brenum 8, e.g.
Approximately 5% of the atoms invade the flow path 7 between the reactor vessel wall and the reactor wall cooling liner 6, and overflow over the terminal end of the reactor wall cooling relay 6 into the vent 1114.

The coolant that passes through the core 4 and reaches the play j-1\111) enters the bulge 1 gnome 14 in the bag through the communication hole 15 at the upper end, forming a liquid level in the brenum 14 in the packet. do. Further, when the liquid level 16 in the upper plenum 11 rises by 10 degrees, the coolant in the upper plenum 11 flows into the intra-packet plenum 14 through the communication hole 15. On the other hand, the coolant flowing in the flow path 7 passes over the upper end of the furnace wall cooling liner 6 and overflows into the bucket 1 to the inner pipe 1 nonum 14. The coolant in the plenum 14 within the packet reaches a predetermined height that determines the liquid level 11'! The liquid level is determined by the A-puff flow pipe 12, and the coolant above the liquid level is guided through the A-puff flow pipe 12 to a audience-buff flow tank (not shown) outside the reactor vessel. In this case, the Δ-buffflow tube 12 passes through the reactor vessel 1 and is guided to the outside. However, plenum 1 inside the bucket
4 contains cold material that has passed through the core 4 and reached the upper part 11, and material that flows through the channel 7 and passes through the upper end of the reactor wall cooling liner 6 and flows into the There are two types of coolant;
The inside of the inner plenum 14 cannot be stirred, and the liquid 4 (
This is a small piece of the master-C technique that corresponds to the variation of l. On the other hand, the coolant flowing from the flow path 7 flows into the upper part of the inner plenum 14 through the bucket 1 where the opening 17 of the over-puff [1-pipe 12 is located], so the coolant eventually flows into the A-buff D-pipe 12.
Most of the Ji material is low-temperature material that flows in from the flow path 7. Therefore, the Opaf tube 12 is at a low temperature,
In addition, since there is no large temperature difference between the reactor vessel 1 and the overflow pipe 12 when the overflow pipe 12 passes through the reactor vessel 1 and the overflow pipe 12 passes through the reactor vessel 1, the thermal conditions are relaxed and the step-up process is facilitated. It is.

J3, actively pumps the cold LD material flowing through channel 7 into buckets 1~
If it is necessary to reduce the inflow into the inner plenum 14, the height of the corresponding portion 21 of the furnace wall cooling liner 6 may be made slightly lower than the other portions 22.
0, 1: In another embodiment, the plenum 14 in the mouth packet is formed partially in the circumferential direction of the furnace wall cooling 7Jl liner 6, as shown in FIG. There are n pieces (→ may be used) all around the inner circumference of the furnace wall cooling lie J--6.

[Brief explanation of drawings]

Figure 1 shows the conventional reactor vessel A-buff I:1-+i'r
FIG. 2 is an explanatory diagram showing an overflow structure in a reactor vessel according to an embodiment of the present invention; FIG. 1' is a vertical sectional partial view, and FIG. 4 is a partial perspective view showing an overflow structure within the reactor vessel. 1... Reactor vessel 3... Shielding plug 4...
・Core 5... Core upper mechanism 6... Reactor wall cooling lJ'
I liner 7...Flow path 8...Lower plenum
11... Upper plenum 12... Overflow pipe 13... Back wall 14... Pre-thickness in bucket 8-15... Communication hole 16... Liquid level 17... Opening patent application Person Mitsubishi Atomic Crab Industry Co., Ltd. Attorney 10 Osamu Kawai - 〇 - Figure 3 11

Claims (2)

[Claims] (1) In the reactor vessel ♀ (Jji), install a cold 1.11 liner for the reactor room cold 11, which forms a flow path for the cold 11 material to flow, and pass it through the communication hole. Bucket 4-17Q +J, 1)i with an internal space communicating with the upper bretsum
7. The structure is such that the cold sweet water for the furnace wall cooling port flowing out from the flow r8 flows into the vane r=tl-, and the liquid level in the buckets 1 to 1 is set to the legal value η. Rui ◇Inside the reactor vessel A-Bano 1 structure characterized by the fact that the Δ-buff 1-column tube is inserted into the reactor vessel. (2) The height of the portion of the upper end portion of the furnace wall cooling liner that corresponds to the buckets 1 to 1 is lower than other portions. Overpuff inside the reactor vessel of “1-Structure. = 1-