TY - GEN
T1 - A Risk-Informed Assessment of Operational Options for Successfully Avoiding a Trip Setpoint
AU - Muhlheim, Michael D.
AU - Ramuhalli, Pradeep
AU - Yigitoglu, Askin Guler
AU - Huning, Alex
AU - Saxena, Abhinav
N1 - Publisher Copyright:
© 2023 Proceedings of 18th International Probabilistic Safety Assessment and Analysis, PSA 2023. All Rights Reserved.
PY - 2023
Y1 - 2023
N2 - An important function of the control system is to maintain sufficient margin between plant operating parameters and reactor protection parameters to prevent unnecessary trips or to provide investment protection. The control system monitors real-time plant and equipment status and maintains specific knowledge of the trip setpoints of the reactor protection system under all operating regimes. Risk-informed decision-making requires a probabilistic assessment of the likelihood of success given the status of the plant/systems and component health, and a deterministic assessment between plant operating parameters and reactor protection parameters to prevent unnecessary trips and challenges to plant safety systems. The probabilistic portion of the risk-informed decision-making framework identifies those actions that if taken, would maintain system status within the acceptable region (i.e., avoiding a trip setpoint). The integration of deterministic calculations of those control options selected probabilistically using multi-physics analyses (i.e., neutronics, thermal, and thermal-hydraulics) provides the necessary information to optimize the selection of the control action to be taken. The metric for the deterministic analysis is based on maintaining and/or controlling the heat balance from the reactor core to the ultimate heat sink and must also reflect the success of maintaining this heat balance. Thus, the deterministic assessment between plant operating parameters and reactor protection parameters is used to identify the margin between operating conditions and trip setpoints. The control options are identified and ranked based on their probability of successfully avoiding a trip setpoint, how fast the system parameters being evaluated are approaching its trip setpoint, and how far it is from reaching that setpoint (i.e., margin) based on component health and equipment failures or being out of service in the Condensate and Feedwater System (FHS) of a BWR.
AB - An important function of the control system is to maintain sufficient margin between plant operating parameters and reactor protection parameters to prevent unnecessary trips or to provide investment protection. The control system monitors real-time plant and equipment status and maintains specific knowledge of the trip setpoints of the reactor protection system under all operating regimes. Risk-informed decision-making requires a probabilistic assessment of the likelihood of success given the status of the plant/systems and component health, and a deterministic assessment between plant operating parameters and reactor protection parameters to prevent unnecessary trips and challenges to plant safety systems. The probabilistic portion of the risk-informed decision-making framework identifies those actions that if taken, would maintain system status within the acceptable region (i.e., avoiding a trip setpoint). The integration of deterministic calculations of those control options selected probabilistically using multi-physics analyses (i.e., neutronics, thermal, and thermal-hydraulics) provides the necessary information to optimize the selection of the control action to be taken. The metric for the deterministic analysis is based on maintaining and/or controlling the heat balance from the reactor core to the ultimate heat sink and must also reflect the success of maintaining this heat balance. Thus, the deterministic assessment between plant operating parameters and reactor protection parameters is used to identify the margin between operating conditions and trip setpoints. The control options are identified and ranked based on their probability of successfully avoiding a trip setpoint, how fast the system parameters being evaluated are approaching its trip setpoint, and how far it is from reaching that setpoint (i.e., margin) based on component health and equipment failures or being out of service in the Condensate and Feedwater System (FHS) of a BWR.
UR - http://www.scopus.com/inward/record.url?scp=85184347368&partnerID=8YFLogxK
U2 - 10.13182/PSA23-40963
DO - 10.13182/PSA23-40963
M3 - Conference contribution
AN - SCOPUS:85184347368
T3 - Proceedings of 18th International Probabilistic Safety Assessment and Analysis, PSA 2023
SP - 314
EP - 323
BT - Proceedings of 18th International Probabilistic Safety Assessment and Analysis, PSA 2023
PB - American Nuclear Society
T2 - 18th International Probabilistic Safety Assessment and Analysis, PSA 2023
Y2 - 15 July 2023 through 20 July 2023
ER -