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HomeSpace NewsTrouble Aboard the ISS: NASA's Cautious Approach to ISS Coolant Leak

Trouble Aboard the ISS: NASA’s Cautious Approach to ISS Coolant Leak

In an unexpected twist of events, NASA finds itself postponing a crucial spacewalk on the International Space Station (ISS) for the time due to a coolant leak detected on the Russian Nauka science module. The leak, initially identified on October 9, 2023, has raised concerns, but reassuringly, it poses no immediate danger to the crew or the ISS itself. In this detailed blog post, we will delve deeper into the particulars surrounding this incident, covering the nature of the leak, its detection, NASA’s response, the impact on ISS operations, and the broader implications.

The Nature of the Leak

The nature of the leak has grabbed the attention of space enthusiasts worldwide. It involves ammonia coolant, a vital component for regulating the temperature on the ISS. The choice of ammonia is strategic; while toxic, it is non-flammable. The leak itself is traced back to a backup radiator, an element of the ISS system reserved for use only when the primary radiator fails, adding an extra layer of complexity to the situation.

Detection of the Leak

The leak in question didn’t go unnoticed, thanks to the vigilant eyes at NASA’s Mission Control Center in Houston. The drop in pressure within the backup radiator was the first sign of trouble. Simultaneously, a visible white cloud of ammonia flakes drifting away from the ISS presented a tangible piece of evidence, making it abundantly clear that a problem was afoot.

NASA’s Response

NASA’s response to the ammonia leak has been marked by a caution-first approach. The agency is determined to unravel the root cause of the leak and ensure it’s resolved before any spacewalks are permitted. NASA engineers are currently engaged in a thorough analysis of data and video footage related to the leak. Moreover, they are collaborating closely with their counterparts at Roscosmos to devise a comprehensive plan for addressing and rectifying the issue.

Delaying Spacewalks

The decision to delay spacewalks was not taken lightly. These activities are essential for the maintenance and progression of the ISS, but they also pose significant risks to the astronauts involved. Exposure to the vacuum of space, potential encounters with micrometeoroids, and the presence of other debris make astronaut safety a paramount concern. As such, NASA has rightfully exercised caution, only proceeding with spacewalks when they are confident the ammonia leak is entirely under control, ensuring zero risk to the astronauts.

The Schedule for Future Spacewalks

At this stage, NASA has refrained from announcing new dates for the postponed spacewalks. Their commitment to transparency assures the public that they will be informed once the leak investigation concludes, and all necessary remedial actions have been taken.

Impact on ISS Operations

Crucially, NASA officials have affirmed that the rescheduling of the spacewalks will not disrupt ISS operations. The dedicated crew on board continues to perform their daily duties and scientific experiments without any interruptions, maintaining the station’s essential functions.

NASA’s Unwavering Commitment to Safety

Above all, NASA’s unwavering commitment to safety shines through in their actions. The agency’s extensive experience in conducting spacewalks and their dedication to constant improvement in safety procedures are evident throughout this unexpected challenge. Safety remains at the forefront of all decisions related to ISS operations.

Additional Information

The Nauka science module, which experienced the ammonia leak, was launched in July 2021 and docked with the ISS in July 2022. Despite facing technical challenges since its launch, NASA and Roscosmos remain committed to resolving these issues and continuing to employ the module for scientific research, highlighting their dedication to utilizing all available resources.

Spacewalk Risks

The inherent risks associated with spacewalks have been widely discussed. Astronauts must brave the harsh vacuum of space, and potential encounters with micrometeoroids and other debris make these activities particularly hazardous. NASA mitigates these risks by providing astronauts with pressurized spacesuits and helmets for protection, along with appropriate tools and equipment for repairs and replacements on the ISS. Extensive training in simulated space environments ensures that astronauts are prepared for the challenges they may face.

NASA’s Safety Record

NASA boasts a storied history of conducting spacewalks safely, dating back to the first spacewalk in 1965. While incidents have occurred, NASA’s dedication to safety remains unwavering. The agency continually seeks to enhance its safety protocols to minimize risks during spacewalks, illustrating their commitment to continuous improvement.


The delay in conducting spacewalks due to the ammonia leak on the ISS is a testament to NASA’s dedication to safety and thorough investigation. The space agency is committed to ensuring that the cause of the leak is fully understood and rectified before any spacewalks proceed. The safety of the astronauts and the integrity of the ISS are the top priorities for NASA as they navigate this unexpected challenge. Through their actions, NASA reinforces their commitment to preserving the safety and functionality of the ISS while advancing scientific research in space.

Selig Amoak
Selig Amoak
Selig is a passionate space enthusiast and advocate. He has been fascinated by space since he was a child, and his passion has only grown over the years. Selig is particularly interested in the exploration of Mars and the search for life beyond Earth. Selig is also a strong believer in the importance of space education and outreach. He is currently a student at the University of Mines and Technology, and he is excited to use his skills and knowledge to contribute to the space education community.


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