International Space Station Spacecraft Charging Hazards: Hazard Identification, Management, and Control Methodologies, with Possible Applications to Human Spaceflight Beyond LEOIn this paper, we present an overview of how the International Space Station (ISS) safety engineering methodology directed to controlling extravehicular activity (EVA) crew electrical shock hazards, caused by ISS spacecraft charging, has evolved over the past 25+ years. Long-term measurements of ISS charging severity and frequency-of-occurrence, combined with detailed probabilistic analysis of EVA electric shock- circuit completion, led to a change in hazard control methodology. The requirement for two-fault tolerant EVA shock hazard control during all EVAs was replaced with a less operationally burdensome and risky EVA shock hazard detection and warning process. The applicability of event probability-based detection-and- warning processes to human spaceflight charging hazard control beyond low-earth orbit (LEO) is also considered.
Document ID
20200001609
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Koontz, Steve (NASA Johnson Space Center Houston, TX, United States)
Castillo, Terri (NASA Johnson Space Center Houston, TX, United States)
Hartman, William (Boeing Company Long Beach, CA, United States)
Schmidl, William (Boeing Company Long Beach, CA, United States)
Haught, Megan (NASA Johnson Space Center Houston, TX, United States)
Duncan, Gary (NASA Johnson Space Center Houston, TX, United States)
Gingras, Benjamin (Boeing Company Long Beach, CA, United States)
Vera, Jerry (Boeing Company Long Beach, CA, United States)
Date Acquired
March 13, 2020
Publication Date
May 15, 2019
Subject Category
Physics (General)
Report/Patent Number
JSC-E-DAA-TN68263-1
Meeting Information
Meeting: International Association for the Advancement of Space Safety (IAASS) Conference
IDRelationTitle20200001610See AlsoInternational Space Station Spacecraft Charging Hazards: Hazard Identification, Management, and Control Methodologies, with Possible Applications to Human Spaceflight Beyond LEO