# US 10,504,631 B2 · Plant abnormality prediction detection system

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- Number: US 10,504,631 B2
- Document ID: US10504631B2
- Status: Granted
- Kind: B2
- Application number: 15/579,715
- Filed: 2016-06-22
- Published: 2018-06-28
- Granted: 2019-12-10
- Earliest claimed: 2015-09-25
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Kenji Mashio; Takae Yamashita; Takashi Azuma; Susumu Shiizuka; Junichi Nishitani; Masafumi Utsumi; Jun Shibuya
- Web page: https://patentgrep.com/patent/US10504631B2

## CPC

- G21D 3/04: Safety arrangements (emergency protection of reactor G21C9/00)
- G05B 23/02: Electric testing or monitoring
- G05B 23/0235: {based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold}
- G21C 17/00: Monitoring; Testing (measuring in general G01); {Maintaining}
- Y02E 30/00: Energy generation of nuclear origin
- Y02E 30/30: Nuclear fission reactors
- G21D: NUCLEAR POWER PLANT
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- G21C: NUCLEAR REACTORS (fusion reactors, hybrid fission-fusion reactors G21B; nuclear explosives G21J)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A plant abnormality predict detection system for detectably monitoring an indication of abnormality in an atomic power generation plant is provided with: a data storage unit which stores plant operation data including an instrument parameter measured in the atomic power generation plant; and a monitoring and control unit which, on the basis of the plant operation data, detects an indication of abnormality in the atomic power generation plant, wherein the atomic power generation plant performs a base-load operation so that the instrument parameter has a prescribed target value, and wherein the monitoring and control unit, on the basis of past plant operation data, sets a normal range W that is a range in which the instrument parameter at the current time transitions normally, and detects an indication of abnormality when the instrument parameter at the current time exceeds the normal range W that has been set.

## Claims

### Claim 1

A plant abnormality prediction detection system for detectably monitoring an abnormality prediction in a nuclear power plant, comprising:
a data storage unit configured to store plant operation data including an instrument parameter measured in the nuclear power plant and an alarm threshold for a warning of abnormality in the nuclear power plant; and
a monitoring control unit configured to detect an abnormality prediction in the nuclear power plant on the basis of the plant operation data,
wherein the nuclear power plant performs a base-load operation so that the instrument parameter has a predefined target value, and
wherein the monitoring control unit is further configured to set a region having a value which is equal to or smaller than the alarm threshold as a normality determination range in which the instrument parameter is normal and a region having a value greater than the alarm threshold as an abnormality determination range in which the instrument parameter is abnormal, and set, in the normality determination range, a normal range which is a range for a transition of the instrument parameter in an operation cycle from operation starting to operation stopping of the nuclear power plant based on the past plant operation data to store the normal range in the data storage unit in advance, and configured to detect an abnormality prediction in a case where the instrument parameter at the current time exceeds the set normal range.

### Claim 2 (depends on 1)

The plant abnormality prediction detection system according to claim 1,
wherein an alarm threshold for a warning of abnormality in the nuclear power plant is set in advance,
wherein the alarm threshold is a threshold value for dividing a region of the instrument parameter into a normality determination range in which the instrument parameter is normal and an abnormality determination range in which the instrument parameter is abnormal, and
wherein the normal range is set in the normality determination range.

### Claim 3 (depends on 1)

The plant abnormality prediction detection system according to claim 1,
wherein a plurality of operation modes corresponding to operation situations of the nuclear power plant are prepared in advance,
wherein the normal range is prepared in a plurality on the basis of the plant operation data in the past operation situations corresponding to the plurality of operation modes, and
wherein, if the operation mode corresponding to the present operation situation of the nuclear power plant is set, the monitoring control unit is further configured to set the normal range corresponding to the operation mode.

### Claim 4 (depends on 1)

The plant abnormality prediction detection system according to claim 1,
wherein the monitoring control unit is further configured to change a width of the set normal range.