REG NASA-LLIS-0038-1992 Lessons Learned - Undetected GH2 Release in the OPF.pdf

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1、Lessons Learned Entry: 0038Lesson Info:a71 Lesson Number: 0038a71 Lesson Date: 1992-09-18a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Undetected GH2 Release in the OPF Description of Driving Event: After landing and prior to fuel cell deactivation, PRSD tank pressures n

2、ormally will increase. The GH2 pressure will vent from the right side of the orbiter when pressures reach approximately 290 psi. This venting has occurred during roll-in of the orbiter to the OPF and could cause a fire if an ignition source is present.Lesson(s) Learned: Failure to establish controll

3、ed venting of PRSD tanks prior to exceeding tank relief pressures, could cause inadvertant venting and danger of fire.Recommendation(s): Ensure all OMIs are updated to establish controlled venting at the SLF (or other safe area) after landing and prior to OPF roll-in.Evidence of Recurrence Control E

4、ffectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Energetic Materials - Explosive/Propellant/Pyrotechnica7

5、1 Explosives Handlinga71 Facilitiesa71 Flight Operationsa71 Flight Equipmenta71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71 Hazardous/Toxic Waste/Materialsa71 Launch Vehiclea71 Pressure VesselsAdditional Info: Approval Info: a71 Approval Date: 1994-06-01a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-