"Because of this, NASA engineers accept that a small amount of hydrogen will escape seals in the fueling line. Agency officials said in 2022 that the safe limit was a 4 percent concentration of hydrogen gas in the housing around the fueling connector. Hydrogen levels exceeded NASA's safety limit multiple times during the practice countdown that ran from Monday into early Tuesday."
"The closeout crew took longer than anticipated to close and secure the hatch to the Orion spacecraft. A valve associated with Orion's hatch pressurization inadvertently vented, according to NASA, requiring the closeout crew to retorque the valve. The launch team dealt with several other glitches, including audio dropouts on ground communication loops and camera problems believed to be caused by recent cold weather in Central Florida."
Engineers accept that a small amount of hydrogen will escape seals in the fueling line. The safe limit was set at a 4 percent concentration of hydrogen gas in the housing around the fueling connector in 2022. Hydrogen levels exceeded that safety limit multiple times during a practice countdown that ran from Monday into early Tuesday. Attempts to resolve the issue involved stopping liquid hydrogen flow into the core stage, warming the interface to allow seals to reseat, and adjusting propellant flow. The rocket was later fully fueled with more than 750,000 gallons. Closeout operations experienced delays, a vented hatch pressurization valve required retorquing, and communications and camera glitches occurred during cold weather. The final countdown progressed to the planned T‑33 second cutoff.
Read at Ars Technica
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