CONTROL SYSTEM FOR PLANT

• US 20130136222A1
• Filed: 08/02/2011
• Published: 05/30/2013
• Est. Priority Date: 08/12/2010
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Satake, Hidekazu, Nagai, Tetsuro
• Granted Patent: US 9,558,856 B2
• Time in Patent Office: Days
• US Class Current: 376/210
• CPC Class Codes: G21C 7/00 Control of nuclear reaction
• CPC Class Codes: G21D 3/00 Control of nuclear power plant control of nuclear reaction in general G21C7/00
• CPC Class Codes: G21D 3/001 Computer implemented control
• CPC Class Codes: G21D 3/007 Expert systems
• CPC Class Codes: G21D 3/04 Safety arrangements emergency protection of reactor G21C9/00
• CPC Class Codes: Y02E 30/00 Energy generation of nuclear origin
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

In a control system for a plant controlling a plant such as a nuclear power plant 1 with use of a plurality of digital control devices 41, the plurality of digital control devices 41 include a plurality of control functions 46 to 56, and the plurality of control functions 46 to 56 are provided in the plurality of digital control devices 41 in a distributed manner so that the digital control devices 41 may not fall below safety standards preset by safety analyses. This provides a control system for a plant using the plurality of digital control devices 41 and configured to control a plant safely even when a digital control device is failed.

Claims

1. A control system for a plant for controlling a plant with use of a plurality of digital control devices, wherein

the plurality of digital control devices include a plurality of control means, and

the plurality of control means are provided in the plurality of digital control devices in a distributed manner so that the digital control devices may not fall below safety standards preset by safety analyses.

2. The control system for a plant according to claim 1, wherein

the plant is a nuclear power plant including a nuclear reactor, a plurality of steam generators connected to the nuclear reactor, and a plurality of main feed water systems configured to supply a coolant to the respective steam generators,

the plurality of control means include a plurality of feed water control means controlling the respective main feed water systems, and

the plurality of feed water control means are distributed into the different digital control devices, respectively.

3. The control system for a plant according to claim 1, wherein

the plant is a nuclear power plant including a nuclear reactor,

the plurality of control means include an actuation control means controlling actuation of a unit provided in the nuclear power plant and an interlock control means locking actuation control by the actuation control means, and

the actuation control means and the interlock control means locking actuation control are distributed into the different digital control devices, respectively.

4. The control system for a plant according to claim 1, wherein

the plant is a nuclear power plant including a nuclear reactor housing therein a fuel assembly, a control rod driving unit configured to drive a control rod to be inserted in the fuel assembly, a steam generator connected to the nuclear reactor, and a main feed water system configured to supply a coolant to the steam generator,

the plurality of control means include a control rod driving control means controlling the control rod driving unit and a feed water control means controlling the main feed water system, and

the control rod driving control means and the feed water control means are distributed into the different digital control devices, respectively.

5. The control system for a plant according to claim 1, wherein

the plant is a nuclear power plant including a nuclear reactor housing therein a fuel assembly and a control rod to be inserted in the fuel assembly and a boron concentration control unit configured to control boron concentration in a coolant circulating in the nuclear reactor,

the plurality of control means include a control rod shutdown margin monitor means configured to monitor a shutdown margin of the nuclear reactor by the control rod and a boron concentration control means controlling the boron concentration control unit, and

the control rod shutdown margin monitor means and the boron concentration control means are distributed into the different digital control devices, respectively.

6. The control system for a plant according to claim 1, wherein each of the plurality of digital control devices includes a plurality of computing units.