JPS60249092A - Nuclear reactor - 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 to which the invention pertains] This invention relates to a nuclear reactor having an internal pump.

[Prior art and problems with 7′]

For example, in a boiling watercolor reactor with multiple internal pumps as shown in Figure 1, the flow of reactor cooling water is disturbed on the upstream side of the internal pumps due to mutual influence between adjacent internal pumps. Pre-turning etc. will occur.

In addition, on the downstream side of the internal pump, for example, if there is an imbalance in the operating status of each internal pump, the discharge flow of reactor cooling water from the internal pump will not only be directed toward the core, but also There is also a component that flows in the circumferential direction inside the reactor pressure vessel: This leads to a decrease in the cooling efficiency of the reactor core. Furthermore, if one or more internal pumps were stopped, there was a problem in that reactor cooling water would flow backwards from the stopped internal pumps.

[Purpose of the invention]

This invention improves the drawbacks of the conventional device mentioned above.
An object of the present invention is to rectify the flow of reactor cooling water on the upstream or downstream side of an internal pump, and to provide a nuclear reactor in which the reactor cooling water does not flow backward when the internal pump is stopped. .

[Summary of the invention]

This invention relates to a boiling watercolor nuclear reactor having an internal pump, and a partition plate or a type of valve mechanism provided upstream or downstream of the internal pump.

This is a nuclear reactor equipped with a reactor cooling water rectification device constructed as described above.

〔Effect of the invention〕

According to this invention, the flow of reactor cooling water upstream or downstream of the internal pump can be adjusted, thereby improving the cooling efficiency of the reactor core.

In addition, by being equipped with a type of valve mechanism, it has a function to vary the flow rate control of the internal pumps, and adjusts variations in the flow rate of reactor cooling water due to imbalances in the operating status of each internal pump. It is also possible to prevent the reactor coolant from flowing backward when one or more internal pumps are stopped.

Furthermore, since the rectifier is installed in each internal pump and the water flow flows between adjacent internal pumps without affecting each other, the rectifier is equipped with a flow rate measuring device. By letting
It is also possible to precisely measure the flow rate of reactor cooling water flowing into or being discharged from each internal pump.

[Embodiments of the invention]

Embodiments of the invention will be described with reference to the drawings. FIG. 2 shows an embodiment of the present invention, in which a rectifier is provided on the downstream side of the internal pump 1. Reactor pressure vessel inner wall 7, pump deck 8, shroud support leg 10
Each internal pump is partitioned off by a partition plate 5 which is fixed using a partition plate 5. As a result, even if an imbalance occurs in the operating conditions of the internal pumps, the reactor cooling water will not flow toward the adjacent internal pumps but will be discharged toward the core. It is also possible to control the flow rate of reactor cooling water.

Further, if one or more internal pumps are stopped, the valve mechanism 6 of the internal pump is fully closed to prevent reactor cooling water from flowing back.

Note that the figure shows the valve mechanism 6 in a fully closed state, and the open state is indicated by a chain line.

[Other embodiments of the invention]

Another embodiment of the invention will be described with reference to FIG. In this example, a reactor cooling water rectifier is installed upstream of the internal pump 1. A rectifying plate 3 having a valve mechanism 4 on the upper part of the diffuser 2 is connected to the pump deck 8. It is fixed using the reactor pressure vessel inner wall 7 and the S2 door 10. Due to the action of the baffle plate 3, the flow of reactor cooling water flowing into the internal pump 1 becomes smooth without being affected by the water flow of adjacent internal pumps. Further, the effect of the valve mechanism 4 is almost the same as that of the valve mechanism 6 in the first embodiment described above.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing main parts around a conventional internal pump, FIG. 2 is a perspective view showing main parts of a first embodiment of the present invention, and FIG. 3 is a perspective view of another embodiment of the present invention. FIG. 1... Internal pump, 2... Diffuser,
3... Rectifier plate, 4... Valve mechanism, 5... Partition plate, 6
...Valve mechanism, 7...Inner wall of reactor pressure vessel, 8...
Pump deck, 9...Sheroud support leg. 10...Sico Loud. Agent: Patent Attorney Noriyuki Chika (and 1 other person) Figure 1, Figure 28I! Figure 3

Claims (1)

[Claims] In a boiling watercolor nuclear reactor having a plurality of reactor built-in recirculation pumps (hereinafter referred to as internal pumps), a reactor cooling water rectifier having a valve mechanism is provided in the flow path upstream or downstream of the internal pumps. A nuclear reactor characterized by: