ML21034A603
| 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 2
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
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
ROD POSITION &
OVATION DISPLAY OVATION DISPLAY OVATION DISPLAY OVATION DISPLAY OVATION DISPLAY ALARM DISPLAY ALARM DISPLAY ALARM DISPLAY ALARM DISPLAY ALARM DISPLAY Reserved for RG 1.97 End-state Control Room Configuration