TY - JOUR
T1 - Planning of alternative countermeasures for a station blackout at a boiling water reactor using multilevel flow modeling
AU - Song, Mengchu
AU - Gofuku, Akio
N1 - Funding Information:
A part of the results of this study was obtained by the support of Japan Society for the Promotion of Science (JSPS) [KAKENHI grant number 16H03136 ] and CHUBU Electric Power Co., Inc. in Japan.
Publisher Copyright:
© 2018
PY - 2018/5
Y1 - 2018/5
N2 - Operators face challenges to plan alternative countermeasures when no procedure exists to address the current plant state. A model-based approach is desired to aid operators in acquiring plant resources and deriving response plans. Multilevel flow modeling (MFM) is a functional modeling methodology that can represent intentional knowledge about systems, which is essential in response planning. This article investigates the capabilities of MFM to plan alternatives. It is concluded that MFM has a knowledge capability to represent alternative means that are designed for given ends and a reasoning capability to identify alternative functions that can causally influence the goal achievement. The second capability can be applied to find originally unassociated means to achieve a goal. This is vital in a situation where all designed means have failed. A technique of procedure synthesis can be used to express identified alternatives as a series of operations. A case of station blackout occurring at the boiling water reactor is described. An MFM model of a boiling water reactor is built according to the analysis of goals and functions. The accident situations are defined by the model, and several alternative countermeasures in terms of operating procedures are generated to achieve the goal of core cooling.
AB - Operators face challenges to plan alternative countermeasures when no procedure exists to address the current plant state. A model-based approach is desired to aid operators in acquiring plant resources and deriving response plans. Multilevel flow modeling (MFM) is a functional modeling methodology that can represent intentional knowledge about systems, which is essential in response planning. This article investigates the capabilities of MFM to plan alternatives. It is concluded that MFM has a knowledge capability to represent alternative means that are designed for given ends and a reasoning capability to identify alternative functions that can causally influence the goal achievement. The second capability can be applied to find originally unassociated means to achieve a goal. This is vital in a situation where all designed means have failed. A technique of procedure synthesis can be used to express identified alternatives as a series of operations. A case of station blackout occurring at the boiling water reactor is described. An MFM model of a boiling water reactor is built according to the analysis of goals and functions. The accident situations are defined by the model, and several alternative countermeasures in terms of operating procedures are generated to achieve the goal of core cooling.
KW - Alternative Countermeasure
KW - Decision-Making Support
KW - Multilevel Flow Modeling
KW - Response Planning
KW - Station Blackout
UR - http://www.scopus.com/inward/record.url?scp=85045430951&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85045430951&partnerID=8YFLogxK
U2 - 10.1016/j.net.2018.03.004
DO - 10.1016/j.net.2018.03.004
M3 - Article
AN - SCOPUS:85045430951
SN - 1738-5733
VL - 50
SP - 542
EP - 552
JO - Nuclear Engineering and Technology
JF - Nuclear Engineering and Technology
IS - 4
ER -