Korea Atomic Energy Research Institute

Korea Hydro Nuclear Power Co., Ltd.

Seong-O Kim

Jae-Hyuk Eoh

Ji-Woong Han

Yoon Sub Sim

Dohee Hahn

Tae-Ho Lee

Myung Hwan Wi

Eui Kwang Kim

Yoon-Sub Sim

Do Hee Hahn

Disclosed herein is a fully passive decay heat removal system utilizing a partially immersed heat exchanger, the system comprising: a hot pool; an intermediate heat exchanger which heat-exchanges with the sodium of the hot pool; a cold pool; a support barrel extending vertically through the boundary between the hot pool and the cold pool; a sodium-sodium decay heat exchanger received in the support barrel; a sodium-air heat exchanger provided at a position higher than the sodium-sodium decay heat exchanger; an intermediate sodium loop connecting the sodium-sodium decay heat exchanger with the sodium-air heat exchanger; and a primary pump, wherein a portion of the effective heat transfer tube of the sodium-sodium decay heat exchanger is immersed in the cold pool, particularly in a normal operating state, and the surface of the lower end of a shroud for the sodium-sodium decay heat exchanger, the lower end being immersed in the sodium of the cold pool, has perforated holes.

Fully passive decay heat removal system for sodium-cooled fast reactors that utilizes partially immersed decay heat exchanger

A direct pool cooling type passive safety grade decay heat removal method and system for removing core decay heat in a pool type liquid metal reactor when a normal heat removal system breaks down. In the liquid metal reactor comprising a reactor vessel, the interior of which is partitioned into a hot pool above a core and a cold pool around the core so that liquid level difference between the hot pool and the cold pool is maintained by a primary pumping head under normal steady-state conditions, is disposed at least one circular vertical tube in such a manner that the sodium in the circular vertical tube is maintained with the same liquid level as the liquid level of the sodium in the cold pool. In the circular vertical tube is disposed a sodium-sodium heat exchanger, which is connected to a sodium-air heat exchanger mounted above a reactor building via a heat removing sodium loop, in such a manner that it is placed at the position higher than a liquid level of the sodium in the cold pool under the normal steady-state conditions.

Passive safety-grade decay-heat removal method and decay-heat removal system for LMR with pool direct heat cooling process

Disclosed herein is a steam generator for a liquid metal reactor and a heat transfer method thereof, and more particularly a steam generator for a liquid metal reactor having intermediate fluid forcibly circulated therein and structurally improved coiled heat transfer tubes installed therein, and a heat transfer method of such a steam generator, whereby an accident of the sodium-water reaction is practically prevented and heat transfer efficiency is improved. The heat transfer method of the steam generator for the liquid metal reactor including a reactor core, a steam generator, and a turbine, utilizes forced circulation for the intermediate fluid in the steam generator. The forced circulation is carried out through a flow channel defined in the steam generator, which forms a closed flow circuit for the intermediate fluid, by means of operation of a circulation pump installed in the flow channel. By the provision of the heat transfer method of the present invention characterized by intermediate fluid forcibly circulated therein and structurally improved coiled heat transfer tubes installed therein, an accident of the sodium-water reaction is practically prevented and heat transfer efficiency is improved. Furthermore, the steam generator is easily installed inside a containment dome, and an intermediate heat transport system and a mitigating system against a sodium-water reaction accident are eliminated from the liquid metal reactor.

Steam generator for liquid metal reactor and heat transfer method thereof

Growing community of inventors

Daejeon, South Korea

Seong-O Kim