JPS58176590A - High temperature coolant cleanup device - 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 [Description of Technical Field J The present invention relates to a high-temperature reactor water purification system for a nuclear reactor.

[Explanation of CIt's new technology] Nuclear reactors purify reactor water using a low-temperature reactor water purification system that uses ion exchange resin to remove cobalt ions and other substances brought into the reactor along with the feed water. A high-temperature reactor water purification system using an inorganic adsorbent (or an inorganic ion exchange material) that can increase the processing flow rate without sacrificing energy is being considered.

FIG. 1 is a system diagram of a conventional high temperature reactor water purification device for a boiling water reactor plant.

In a boiling wood-cover reactor, in order to equalize the heat generated from the core inside the reactor vessel l, a re-ms pump 3 and piping 4 are installed.
Reactor water (280℃, 70#/a
ll) is circulating. In the high-temperature reactor water purification system, reactor water branched from the recirculation system is introduced by a cleanup pump 5 into a high-temperature cobalt removal device 6 that uses an inorganic adsorbent (or inorganic ion exchange material). Here, cobalt ions and the like in the reactor water are adsorbed and removed, and the purified reactor water is returned to the reactor vessel l through the recirculation system.

The inorganic adsorbent used in the high-temperature cobalt removal device 6 is a metal oxide or hydrated oxide, a metal acid salt, a silicate, etc., such as magnetite.

Ferrite, titanium oxide, tin oxide, manganese oxide, niobium oxide, ruconium phosphate, etc. are applicable.

These inorganic adsorbents are generally in powder form and have no mechanical strength by themselves, so when applied to the cobalt removal device 6, various improvements have been made regarding pulverization and retention methods.

However, as long as these inorganic adsorbents are used, the mechanical and thermal effects of reactor water are %4! Under the influence of aging, some outflow of inorganic adsorbent due to wear and peeling is unavoidable. Therefore, in order to prevent damage to other systems during contamination of reactor water, the outlet side of cobalt removal equipment 6 is placed under high temperature and high pressure. It is desirable to install a filter that can remove trace amounts of suspended matter.

:) This filter has low pressure loss, easy regeneration by backwashing, and good removal performance.

It is necessary to have high stability and reliability under high temperature and high pressure. [Objective of the Invention] In view of the above points, the present invention aims to obtain a high-temperature reactor water purification device that is efficient and highly reliable. .

[Summary of the Invention] The present inventors found that the generally used occlusive materials were not suitable, and developed a high-temperature electromagnetic filter with magnetic trapping and a heat-resistant and corrosion-resistant material with a large porosity that uses contact sorption as a mechanism. We have found that a high-temperature filter filled with fibers, mesh, or expanded metal is optimal, and have completed the high-temperature reactor water purification system of the present invention in which the above-mentioned filter is combined with the high-temperature cobalt removal device 6. High temperature cobalt removal 4. l
The inorganic adsorbent b used in l116 is an inorganic adsorbent having magnetism, such as magnetite, in a high-temperature reactor water purification system that employs a high-temperature electromagnetic filter as a filter.

A magnetic inorganic adsorbent such as ferrite or a magnetic-nonmagnetic composite inorganic adsorbent is optimal. In high-temperature reactor water purification systems using high-temperature filters, non-magnetic inorganic adsorbents such as metal oxides such as tin oxide, manganese dioxide, titanium oxide, zirconium oxide, niobium oxide, oxide, fxte, etc. Metal acid salts such as silconium acid and tin arsenate are most suitable.

[Structure and operation of the invention] An embodiment of the invention will be described below with reference to FIG. FIG. 2 is a basic system diagram of a high-temperature reactor water purification system that combines a high-temperature cobalt removal device using inorganic adsorption with a high-temperature electromagnetic filter or a high-temperature filter. The same parts as in FIG. 1 are given the same reference numerals.

This high-temperature reactor water purification system includes a clean-up pump 5, a high-temperature cobalt removal device 6, and a high-temperature electromagnetic filter or high-temperature filter 7.
It consists of

In a high-temperature reactor water purification system that uses a high-temperature electromagnetic filter as the filter 7, the high-temperature cobalt removal device 6 uses a magnetic inorganic adsorbent such as magnetite or ferrite, or a magnetic inorganic adsorbent such as magnetite or ferrite.
In high-temperature reactor water purification equipment that uses non-magnetic composite inorganic adsorbents and high-temperature filters, tin oxide, manganese dioxide,
It is filled with a nonmagnetic inorganic adsorbent such as a metal oxide such as titanium oxide, zirconium oxide, niobium oxide, or tungsten oxide, or a metal acid salt such as zirconium phosphate or tin arsenate. These inorganic adsorbents are stable under the reactor water conditions of a boiling water reactor at 280° C. and 70.9/gI4, and have the ability to adsorb and remove cobalt ions and the like.

In the high-temperature reactor water purification device of the present invention, reactor water (280° C., 70 #/at) branched from the recirculation system of the nuclear reactor is introduced into the high-temperature cobalt removal device 6 by a cleanup pump 5 . Here, cobalt and other substances in the reactor water are adsorbed and removed by the inorganic adsorbent packed in the reactor. At this time, the inorganic adsorbent material becomes turbid and flows out due to mechanical, thermal, or aging effects, albeit in a small amount. The reactor water purified by the high-temperature cobalt removal device 6 is passed through a high-temperature electromagnetic filter 7 or a high-temperature filter 7 K 4 provided on the outlet side.
The inorganic adsorbent suspension that flows out from people is removed by a high-temperature electromagnetic filter 7 when a magnetic inorganic adsorbent is used as the adsorbent, or by a high-temperature filter when a non-magnetic inorganic adsorbent is used.

The reactor water, which has been completely pressure-purified, is returned to the reactor vessel l through the recirculation system.

〔Effect of the invention〕

As explained above, according to the present invention, by combining a high-temperature electromagnetic filter or a high-temperature filter that matches the characteristics of the suspended matter, the inorganic adsorbent suspension that cannot be avoided with the inorganic adsorbent f material is efficiently removed. A high-temperature reactor water purification system that is efficient and highly reliable is realized.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional high-temperature reactor water purification system of a nuclear reactor, and FIG. 2 is a system diagram of a high-temperature reactor water purification system showing an embodiment of the present invention. 1...Reactor capacity I! ! 2...Reactor core 3...Recirculation pump 4...Recirculation system piping 5...Cleanup pump 6...High temperature cobalt removal device.

Claims (2)

[Claims] (1) A high-temperature electromagnetic filter or a heat-resistant corrosion-resistant fiber, net, or extract on the outlet side of the high-temperature cobalt removal device to remove the inorganic adsorbent suspension flowing out from the high-temperature cobalt removal device using an inorganic adsorbent. A high-temperature reactor water purification system characterized by having a high-temperature filter made of band metal or the like as an F material. (2) In high-temperature reactor water purification systems that use high-temperature electromagnetic filters as inorganic adsorbents used in high-temperature cobalt removal equipment, magnetic inorganic cobalt adsorbents can also be used as high-temperature filters! The high temperature reactor water purification device according to claim 1, wherein a non-magnetic inorganic cobalt adsorbent is used in the high temperature reactor water purification device to which the high temperature reactor water purification device is applied.