barriers have historically precluded modernization of nuclear plant
first-echelon safety-related (SR) Instrumentation and Control (I&C) systems. These barriers have been
addressed through collaboration between industry leaders and the Nuclear
Regulatory Commission. These advances enable modernization of key safety
systems through the streamlined License Amendment Request (LAR) Alternate
Review process reflected in Digital Instrumentation and Controls Interim Staff
Guidance #06 (DI&C-ISG-06), Revision 2, Licensing Process. While regulatory advances have
improved the environment for modernizing safety systems, the industry has
remained reluctant to perform such I&C upgrades because of perceived
regulatory and financial risks associated with being the first adopter of the
LAR Alternate Review process for highly critical reactor protection system
research products listed below as hyperlinks were developed through a
collaborative effort involving LWRS and Exelon to assist in breaking this
impasse for the industry.
Generation’s Limerick Generating Station was selected as the reference facility
for this research. Please click on the hyperlinks above for a brief summary of
each subject document and to obtain access to that document.
These products were developed to support not only Exelon but the larger nuclear industry. These products make no commitments for Exelon Generation. They are being leveraged and adapted by Exelon in support of a SR I&C Pilot Upgrade Project at LGS.