Passive safety equipment for a nuclear power plant

Patent metadata

Field	Value
Publication number	US-10115488-B2
Application number	US-201415024795-A
Country	US
Kind code	B2
Filing date	Oct 2, 2014
Priority date	Oct 4, 2013
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

The present invention provides passive safety equipment, comprising: a cooling part formed to cool a first fluid, which is emitted from a reactor coolant system or a steam generator, and a second fluid in a housing; and a circulation induction sprayer which is formed to spray the first fluid emitted from the reactor coolant system or the steam generator into the cooling part, has at least part thereof open to the inside of the housing such that the second fluid flows thereinto according to a drop in pressure caused by the spraying of the first fluid, and sprays the second fluid with the inflown first fluid.

First claim

What is claimed is:

1. A passive safety facility for a nuclear power plant, comprising:
a cooling section formed to cool fluid discharged from a steam generator installed inside a nuclear reactor coolant system along with fluid contained within an area between the nuclear reactor coolant system and a containment;
a circulation inducing jet device configured to receive the fluid discharged from the steam generator, and formed to jet the received fluid to the cooling section, at least part of which is open toward an inside of the containment to entrain the fluid contained within the area between the nuclear reactor coolant system and the containment by a pressure drop caused while jetting the received fluid so as to jet the entrained fluid along with the received fluid; and
a first cooling water storage section configured to store pure cooling water to be supplied to the steam generator so as to remove sensible heat within the nuclear reactor coolant system and residual heat in a core, wherein
the containment is formed to surround the steam generator which is configured to generate steam or the nuclear reactor coolant system which is configured to accommodate the steam generator,
a primary system of the nuclear power plant which a primary fluid circulates therein and a secondary system of the nuclear power plant which a second fluid circulates therein are isolated from each other at a boundary formed by the steam generator.

2. The passive safety facility of claim 1 , wherein the circulation inducing jet device comprises:
a fluid jetting section connected to the steam generator to receive the fluid discharged from the steam generator, and formed to jet the received fluid;
a fluid entraining section formed in an annular shape around the fluid jetting section to entrain the fluid contained within the area between the nuclear reactor coolant system and the containment; and
a circulating fluid jetting section configured to surround the fluid jetting section with a portion having an inner diameter larger than that of the fluid jetting section to form the fluid entraining section, and supply the received fluid and the entrained fluid to the cooling section,
wherein the fluid jetting section comprises a nozzle configured to jet the received fluid to the circulating fluid jetting section, and
the circulating fluid jetting section comprises:
a throat formed with an inner diameter smaller than that of an inlet of the nozzle to cause a local pressure drop while jetting the received fluid; and
a diffuser configured to induce the received fluid and the entrained fluid that have passed through the throat to the cooling section.

3. The passive safety facility of claim 1 , wherein the containment comprises:
a containment vessel formed of steel to surround the nuclear reactor coolant system; and
a containment building formed of concrete to surround the containment vessel at a position separated from the containment vessel to form an air circulating flow path, and
the circulation inducing jet device is configured to jet the received fluid and the entrained fluid to an inner wall surface of the containment vessel, and the cooling section cools the containment vessel using air that circulates through the air circulating flow path and a spraying of a passive containment vessel spray system which is configured to spray cooling water to an outer surface of the containment vessel.

4. The passive safety facility of claim 2 , wherein the circulation inducing jet device comprises:
a turbine blade rotatably installed at an outlet of the first fluid jetting section to induce the jetting of the received fluid; and
a pump impeller connected to the turbine blade to rotate along with the turbine blade, and induce the entrainment of the fluid contained with the area between the nuclear reactor coolant system and the containment through the fluid entraining section.

5. The passive safety facility of claim 1 , further comprising:
a filter facility connected to an outlet of the cooling section to filter out noncondensible gas discharged from the cooling section, and collect radioactive materials filtered out from the noncondensible gas.

6. The passive safety facility of claim 5 , wherein the filter facility comprises:
a filter or absorbent configured to separate the radioactive materials from the noncondensible gas;
a gas discharge section configured to discharge noncondensible gas filtered out while passing through the filter or absorbent to an inside of the containment; and
a gas line connected to the outlet of the cooling section to supply the noncondensible gas to the filter or absorbent.

7. The passive safety facility of claim 1 , wherein the cooling section cools the jetted fluid to form condensate, and
the passive safety facility further comprises a cooling water storage section including the first cooling water storage section and formed to store cooling water therein, and
the cooling water storage section is installed below the cooling section to collect the condensate discharged from the cooling section.

8. The passive safety facility of claim 1 , wherein the cooling water storage section comprises:
a second cooling water storage section configured to store borated water to be injected into the nuclear reactor coolant system so as to maintain a level of the nuclear reactor coolant system.

9. The passive safety facility of claim 8 , wherein the passive safety facility further comprises an additive injection section configured to inject an additive into the condensate for suppressing the revolatilization of condensate collected in the cooling water storage section, and
the additive is formed to maintain a pH of the condensate above a preset value.

10. The passive safety facility of claim 9 , wherein the cooling water storage section is configured to collect the condensate in the first cooling water storage section, and flow the condensate collected in the first cooling water storage section into the second cooling water storage section when a level of the collected condensate exceeds a reference level, and
the additive injection section is installed at a flow path connected from the first cooling water storage section to the second cooling water storage section to inject the additive into the condensate flowing into the second cooling water storage section.

11. The passive safety facility of claim 9 , wherein the additive injection section is installed at a flow path connected from the cooling section to the cooling water storage section to inject the additive to condensate collected in the cooling water storage section.

12. The passive safety facility of claim 7 , further comprising:
a condensate holding section installed between the cooling section and the cooling water storage section to collect the condensate falling from the cooling section so as to return it to the cooling water storage section.

13. The passive safety facility of claim 12 , wherein the passive safety facility further comprises:
a return line extended from an outlet of the cooling section or the condensate holding section to the cooling water storage section to return condensate generated during the cooling process of the cooling section to the cooling water storage section.

14. The passive safety facility of claim 13 , wherein the passive safety facility further comprises a filter facility connected to an outlet of the cooling section to filter out noncondensible gas discharged from the cooling section so as to collect radioactive materials filtered out from the noncondensible gas, and
the return line comprises:
a first return line connected to a lower por

Assignees

• Korea Atomic Energy Res

Inventors

• Han Hun Sik
• Kim Young In
• Kang Kyung Jun
• Yi Sung Jae
• Kim Keung Koo
• Yoon Ju Hyeon
• Ha Jae Joo
• Choi Suhn
• Park Cheon Tae
• Ryu Seung Yeob
• Moon Joo Hyung

Classifications

• G21C15/24

  Promoting flow of the coolant (electrodynamic pumps H02K44/02) · CPC title

• G21Y2002/20

  Physics · mapped topic

• G21Y2004/30

  Physics · mapped topic

• G21Y2002/104

  Physics · mapped topic

• G21C15/182 Primary

  comprising powered means, e.g. pumps · CPC title