If you mean “don’t do it today, just because it’s Sunday.” then I would would say “It’s Sunday” is not a reason not to plan work and not to do the work they planned for today, unless during the safety brief for the evolution, or during the morning start up meeting issues were brought up that could make things not as safe as they could be and that could be people tired, not all personnel necessary on site and a hundred other things. This could be the case here. During a start up, work goes on, on day shift, every day. There is no weekend. People do get days off, but not necessarily Saturday and Sunday. Night shift, usually not much happens operations wise. Although there is work done, it’s mostly routine. I look with interest to the reason this happened. Was it a natural gas explosion from a rupture, meaning 500 psi gas engulfing the Turbine Building quickly, or was it a slow leak built up without notice. The plant I work at has not had a lost time accident, an OSHA recordable, or an OSHA reportable in 10 years. Major HP steam leak is probably my biggest concern where I work. Major gas leak, number two. H2 leak, third.
Where do you work?
During an availability, the repair crews (millwrights and machinists, pipers and riggers and welders, foremen, etc are all scheduled on two 7x12 hour shifts (or 2x6x12 hour shifts if Sundays are off), then (usually) a startup crew comes on right towards the end with dedicated startup and testing crews that are (almost always) even smaller.
Even with shift turnovers taking 1/2 hour before and after each shift, it’s generally just the floor engineers and general foreman who stay over. You can’t delay testing (steam and boiler heatup, vibration checks, oil flow checks and heatup, oil flushes, or whatever) just because it’s a Sunday.
HP steam scares the heck out of me.