System for Assisting Operation at the Time of Plant Accident and Method for Assisting Operation at the Time of Plant Accident

• US 20160195872A1
• Filed: 09/11/2013
• Published: 07/07/2016
• Est. Priority Date: 09/11/2013
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: ARITA, Setsuo, KANADA, Masaki, ISHII, Yoshihiko, KAMOSHIDA, Ryota, ISHIKAWA, Tadaaki, KATONO, Kenichi
• Application Number:
  US14/916,535
• Publication Number:
  US 20160195872A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G05B 23/0229 knowledge based, e.g. expert systems; genetic algorithms

Abstract

An object of the invention is to provide a system for assisting operation at the time of a plant accident, which, even if a device malfunctions at the time of the plant accident, can determine normality of a sensor without being influenced by the malfunction. A system for assisting operation at the time of a plant accident, includes: a phenomenon identification apparatus for identifying a state of a plant; a plant behavior analysis apparatus for predicting progress of a process state after a phenomenon occurs by using at least a phenomenon identification result as an initial condition of plant behavior analysis; and a sensor normality determination apparatus for determining normality of a sensor by comparing a result of prediction of the progress of the process state which is output from the plant behavior analysis apparatus with a sensor signal.

Claims

1. A system for assisting operation at the time of a plant accident, comprising:

a phenomenon identification apparatus for identifying a state of a plant;

a plant behavior analysis apparatus for predicting progress of a process state after a phenomenon occurs by using at least a phenomenon identification result as an initial condition of plant behavior analysis; and

a sensor normality determination apparatus for determining normality of a sensor by comparing a result of prediction of the progress of the process state which is output from the plant behavior analysis apparatus with a sensor signal.

4. A system for assisting operation at the time of a plant accident, wherein

the phenomenon identification apparatus according to claim 1 identifies a state of a plant by using at least a device state signal/alarm signal.

5. A system for assisting operation at the time of a plant accident, wherein

the plant behavior analysis apparatus according to claim 1 includes an automatic start condition of a device of a safety system and has a function of starting at least a device model of the safety system and analyzing behavior of a plant in the case where a sensor signal indicating a process state exceeds the automatic start condition.

2. A system for assisting operation at the time of a plant accident, comprising:

a phenomenon identification apparatus for identifying a state of a plant;

a plant behavior analysis apparatus for predicting progress of a process state after a phenomenon occurs by using at least a phenomenon identification result as an initial condition of plant behavior analysis; and

a sensor normality determination apparatus for determining normality of a sensor by synchronizing a time of a result of prediction of the progress of the process state which is output from the plant behavior analysis apparatus with a time of a sensor signal and comparing the result with the sensor signal.

3. A system for assisting operation at the time of a plant accident, comprising:

a phenomenon identification apparatus for identifying an occurring phenomenon by obtaining similarity between a sensor signal and a device state signal/alarm signal and data of a phenomenon database;

a plant behavior analysis apparatus for predicting a process state of a plant that changes as time passes after a phenomenon occurs by using at least a phenomenon identification result as an initial condition of plant behavior analysis; and

a sensor normality determination apparatus for determining normality of a sensor by synchronizing a time of a result of prediction of the process state after the phenomenon occurs with a time of the sensor signal, comparing the result with the sensor signal, and evaluating the similarity.

6. A method for assisting operation at the time of a plant accident, comprising:

identifying a state of a plant;

predicting progress of a process state after a phenomenon occurs by using at least a phenomenon identification result as an initial condition of plant behavior analysis; and

predicting the progress of the process state which is output from a plant behavior analysis apparatus.