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Crew Exploration Vehicle (CEV) Potable Water System Verification DescriptionThe Crew Exploration Vehicle (CEV), also known as Orion, will ferry a crew of up to six astronauts to the International Space Station (ISS), or a crew of up to four astronauts to the moon. The first launch of CEV is scheduled for approximately 2014. A stored water system on the CEV will supply the crew with potable water for various purposes: drinking and food rehydration, hygiene, medical needs, sublimation, and various contingency situations. The current baseline biocide for the stored water system is ionic silver, similar in composition to the biocide used to maintain quality of the water transferred from the Orbiter to the ISS and stored in Contingency Water Containers (CWCs). In the CEV water system, the ionic silver biocide is expected to be depleted from solution due to ionic silver plating onto the surfaces of the materials within the CEV water system, thus negating its effectiveness as a biocide. Since the biocide depletion is expected to occur within a short amount of time after loading the water into the CEV water tanks at the Kennedy Space Center (KSC), an additional microbial control is a 0.1 micron point of use filter that will be used at the outlet of the Potable Water Dispenser (PWD). Because this may be the first time NASA is considering a stored water system for longterm missions that does not maintain a residual biocide, a team of experts in materials compatibility, biofilms and point of use filters, surface treatment and coatings, and biocides has been created to pinpoint concerns and perform testing to help alleviate those concerns related to the CEV water system. Results from the test plans laid out in the paper presented to SAE last year (Crew Exploration Vehicle (CEV) Potable Water System Verification Coordination, 2008012083) will be detailed in this paper. Additionally, recommendations for the CEV verification will be described for risk mitigation in meeting the physicochemical and microbiological requirements on the CEV PWS.
Document ID
20090002583
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Peterson, Laurie
(NASA Johnson Space Center Houston, TX, United States)
DeVera, Jean
(Lockheed Martin Corp. United States)
Vega, Leticia
(Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Adam, Nik
(Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Steele, John
(Hamilton Sundstrand Corp. United States)
Gazda, Daniel
(Wyle Life Sciences, Inc. Houston, TX, United States)
Roberts, Michael
(Dynamac Corp. Cocoa Beach, FL, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Spacecraft Design, Testing And Performance
Meeting Information
Meeting: 39th International Conference on Environmental Systems
Location: Savannah, GA
Country: United States
Start Date: July 12, 2009
End Date: July 16, 2009
Distribution Limits
Public
Copyright
Other

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