[RBriggs_BWR]

They have DC control power. As I understand it, they remove the fuses to ensure that the breaker doesn’t get and close signal during the racking activity.

[RBriggs_BWR]

The downstream bus powers one of the Emergency Response facility HVAC systems along with some other non-safety building HVAC and lighting. My plant determined that the temp power was not a Temp Alt in Support of Maintenance and we went back and did a 50.59 Screening on the activity.

[RBriggs_BWR]

I have it on my list for 2022 to develop the modification to replace the non-safety main generator relays with a digital generator protection system. I agree there is fear in going to digital. I am not especially looking forward to going through the new digital mod requirements that were added to the industry standard design process.

[Author]

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