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While running the leaking pump seal drained cooling water to a level where the pump could no longer return water to the top of the radiator, so water circulation ceased and water in the engine boiled. However, since water loss led to overheat and further water loss from boil-over, the original water loss was hidden.
As the coolant system pressure increases with a rise in temperature, it will reach the point where the pressure relief valve allows excess pressure to escape. This will stop when the system temperature stops rising. In the case of an over-filled radiator (or header tank) pressure is vented by allowing a little liquid to escape.
DEX-COOL antifreeze uses two inhibitors: sebacate and 2-EHA (2-ethylhexanoic acid), the latter which works well with the hard water found in the United States, but is a plasticizer that can cause gaskets to leak. [23]
October 9: A leak from one of Nauka Multipurpose Laboratory Module radiators was observed with the ISS cameras and visual inspections. The origin of the leak was Nauka’s backup radiator while the primary radiator continued working as normal. The radiator system was first delivered to the ISS in 2010 and installed in April 2023.
The damaged S1 radiator on the ISS starboard truss. The S1-3 radiator has a damaged cooling panel that may require on-orbit repair or replacement, as the damage may have the potential to create a leak in the External Thermal Control System (ETCS) of the station, possibly leading to unacceptable loss of the ammonia coolant. [24]
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