ML21034A603

External Presentation Am Connelly_ISG-6 Workshop Presentation

ML21034A603
Person / Time
Site:	Limerick
Issue date:	02/03/2021
From:	Connelly J Exelon Generation Co
To:	Office of Nuclear Reactor Regulation
C. Cheung 301-415-3813
References
Download: ML21034A603 (6)

Text

Leveraging Regulatory And Technical Initiatives For Digital Transformation of Limerick Station John Connelly Engineering Manager - Limerick Modernization Project

Problem Statement:

• Original construction safety systems are reaching the end of their practical service life - performance issues are becoming more common and costs to maintain these systems is rapidly increasing

• Historical regulatory barriers have largely precluded modernization of safety systems

• The industry is facing unprecedented economic challenges and must find innovative ways to reduce labor and material costs In 2019, a public / private partnership was formed between Idaho National Labs and Exelon to deconstruct daily activities to the determine the real cost of maintaining the I&C status quo and identify opportunities to reduce cost and further improve safety and performance 2

Transformation Framework

• Both the research and execution of the Limerick Transformation Project is founded on multiple technical and regulatory initiatives including:

-NRC integrated action plan for digital modernization (SECY-15-01062) including ISG-6, Alternate Review Plan

-EPRI Digital Engineering Guide (3002011816) and subordinate processes

-EPRI Nuclear Plant Modernization Strategy (3002018428)

-DNP Standard Digital Engineering Process (NISP-EN-04)

This strategy was deliberately structured to maximize efficiency, bring advanced analytical tools to bear and make the public facing research transportable to any utility that seeks to pursue similar initiatives 3

Key Takeaways

• Four safety-related systems at Limerick Station are within project scope:

- Reactor Protection System (RPS)

- Redundant Reactivity Control System (RRCS)

- Nuclear Steam Supply Shutoff System (NSSSS)

- Emergency Core Cooling System (ECCS)

• Approximately 75% of physical components are displaced by software which does not degrade over time and requires minimal ongoing maintenance

• Significant changes will be made to the control room to improve situational awareness and maximize information available to operators

• All four systems will be upgraded in a single, standard duration refueling outage 4

Current Control Room Configuration End-state Control Room Configuration ALARM ALARM ALARM ALARM ALARM DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY ROD POSITION &

OVATION OVATION DISPLAY Reserved for RG OVATION OVATION OVATION 1.97 DISPLAY DISPLAY DISPLAY DISPLAY