Adjustable Speed Drive System For Primary Loop Recirculation Pump

• US 20090009000A1
• Filed: 09/15/2008
• Published: 01/08/2009
• Est. Priority Date: 04/11/2005
• Status: Active Grant

• Current Assignee: Hirohisa Satomi, Masashi Sugiyama, Shunya Morita, Yukihiro Katayama
• Original Assignee: Hirohisa Satomi, Masashi Sugiyama, Shunya Morita, Yukihiro Katayama
• Inventors: Satomi, Hirohisa, Sugiyama, Masashi, Katayama, Yukihiro, Morita, Shunya
• Granted Patent: US 7,692,333 B2
• Time in Patent Office: Days
• US Class Current: 307/64
• CPC Class Codes: F04D 15/0066 by changing the speed, e.g. of the driving engine
• CPC Class Codes: F04D 15/0077 Safety measures F04D15/02 takes precedence
• CPC Class Codes: F04D 7/08 the fluids being radioactive
• CPC Class Codes: G21C 15/243 for liquids
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

An adjustable speed drive system for a primary loop recirculation pump and method of control in which a first breaker is connected to an auxiliary power supply system, an inverter is connected to the first breaker, a second breaker is connected to an output of the inverter, a gate driver supplies a gate pulse to the inverter, and an inverter control portion drives the gate driver. The adjustable speed drive system is combined with a backup adjustable speed drive system. When a malfunction in a main adjustable speed drive circuit portion including the inverter and the gate driver in the adjustable speed drive system used in a normal operation is detected, the main adjustable speed drive circuit portion is switched to the backup adjustable speed drive system, and an operation of a recirculation pump motor for driving a recirculation pump that controls a flow of a reactor core is continued.

Claims

1. A method for controlling an adjustable speed drive system for a primary loop recirculation pump, having an adjustable speed drive systems provided with a first breaker connected to a high voltage bus of unit auxiliary power supply system, an inverter connected to the first breaker via a transformer, a second breaker connected to an output side of the inverter, a gate driver that supplies a gate pulse to the inverter, and an inverter control portion that drives the gate driver;

the adjustable speed drive system being combined with a system of a backup adjustable speed drive system, the method comprising the steps of when a malfunction detection portion detects a malfunction in a main adjustable speed drive circuit portion including the inverter and the gate driver in the adjustable speed drive system used in a normal operation, switching the main adjustable speed drive circuit portion to the backup adjustable speed drive system, and continuing an operation of a recirculation pump motor for driving a recirculation pump that controls a flow of a reactor core.

2. A method for controlling an adjustable speed drive system for a primary loop recirculation pump, having two adjustable speed drive sets which are arranged in parallel, each of the two adjustable speed drive sets including an adjustable speed drive system and a backup adjustable speed drive system, wherein the adjustable speed drive system includes a first breaker connected to a high voltage bus of unit auxiliary power supply system, an inverter connected to the first breaker via a transformer, a second breaker connected to an output side of the inverter, a gate driver that supplies a gate pulse to the inverter, and an inverter control portion having two control portions that drive the gate driver, wherein the backup adjustable speed drive system includes a first breaker connected to a high voltage bus of unit auxiliary power supply system, an inverter connected to the first breaker via a transformer, a second breaker connected to an output side of the inverter, a gate driver for supplying a gate pulse to the inverter and wherein the two control portions are connected to the gate driver of the backup adjustable speed drive system via an inverter control signal switch, the method comprising the steps of when a malfunction detection portion detects a malfunction in a main adjustable speed drive circuit portion including the inverter and the gate driver in one of the two adjustable speed drive sets used in a normal operation, switching the main adjustable speed drive circuit portion to the backup adjustable speed drive system, and continuing an operation of a recirculation pump motor for driving a recirculation pump that controls a flow of a reactor core.

3. The method according to claim 2, wherein the switching to the backup adjustable speed drive system includes switching the connection of the two control portions to the gate driver of the backup adjustable speed drive system.

4. An adjustable speed drive system for a primary loop recirculation pump, comprising:

an adjustable speed drive system provided with a first breaker connected to a high voltage bus of unit auxiliary power supply system, an inverter connected to the first breaker via a transformer, a second breaker connected to an output side of the inverter, a gate driver that supplies a gate pulse to the inverter, and an inverter control portion that drives the gate driver;

the adjustable speed drive system being combined with a system of a backup adjustable speed drive system to form a set of adjustable speed drive systems, wherein when a malfunction detection portion detects a malfunction in a main adjustable speed drive circuit portion including the inverter and the gate driver in the adjustable speed drive system used in a normal operation, the main adjustable speed drive circuit portion is switched to the backup adjustable speed drive system, and an operation of a recirculation pump motor for driving a recirculation pump that controls a flow of a reactor core is continued.