NASA's Artemis 1 mission passes crucial fueling test despite leak
, then spent about a month making repairs and upgrades to pave the way for another wet dress try. Loading failures during the first wet dress put a predominant focus on those systems during this morning's cryogenic fueling procedures.
Gaseous nitrogen is used at Pad 39B for purging the fuel tanks, umbilicals and other cavities inside SLS, both before and after tanking. Artemis 1's time back in the VAB following the first wet dress attempt allowed some planned upgrades at the pad to move forward ahead of schedule. One of these upgrades included the enhancement of supply capabilities for the pad's gaseous nitrogen, which nearly doubled in capacity.
The two stages of the SLS rocket are fueled with liquid oxygen and liquid hydrogen . The process of loading both involves super-cooling the propellants and chilling associated hardware prior to tanking. Technicians monitor loading rates carefully, starting with a slow-fill flow, and increasing to peak flow rates once the umbilical connections and fuel tanks acclimate to the extreme cold temperatures.
Though the core stage LH2 tank is the rocket’s largest — coming in at 537,000 gallons — it was also the tank to be topped off first. The SLS core stage LH2 transfer began its boil-off replenishment flow at 12:42 p.m. , allowing operators to begin LH2 cooling for the ICPS about 20 minutes later.
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