10 CFR 830 Major Modification Determination for ATR Diesel Bust (E-3) and Switchgear Replacement

摘要

Near term replacement of aging and obsolescent original ATR equipment has become important to ensure ATR capability in support of NEs long term national missions. To that end, a mission needs statement has been prepared for a non-major system acquisition which is comprised of three interdependent subprojects. The first project, subject of this determination, will replace the existent diesel-electrical bus (E-3) and associated switchgear. More specifically, INL proposes transitioning ATR to 100% commercial power with appropriate emergency backup to include: Provide commercial power as the normal source of power to the ATR loads currently supplied by diesel-electric power. Provide backup power to the critical ATR loads in the event of a loss of commercial power. Replace obsolescent critical ATR power distribution equipment, e.g., switchgear, transformers, motor control centers, distribution panels. Completion of this and two other age-related projects (primary coolant pump and motor replacement and emergency firewater injection system replacement) will resolve major age related operational issues plus make a significant contribution in sustaining the ATR safety and reliability profile.