1、Lessons Learned Entry: 0134Lesson Info:a71 Lesson Number: 0134a71 Lesson Date: 1992-09-24a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Power Reactant Storage and Distribution (PRSD) LH2/GH2 Fuel Cell Servicing Description of Driving Event: The orbiter PRSD system provide
2、s GH2/GO2 for fuel cell operation. The PRSD H2 T-0 umbilical vent is installed to support controlled venting of the PRSD H2 system during convoy operations. The umbilical vent is connected to the backpressure relief panel by flexhoses. Pressure must be maintained on the PRSD manifold during fuel cel
3、l cool down until vent stack and condenser exit temperatures are within 15 degrees Fahrenheit of ambient. Fixed hydrogen leak detection sensors monitor the fuel cell servicing/deservicing system areas for H2 leaks which could result in damage to vehicle/facility or personnel injury.Lesson(s) Learned
4、 A PRSD GH2 leak may result in accumulation of flammable vapors in orbiter compartments or near umbilicals, causing injury or damage.Recommendation(s): Provide periodic inspection/preventative maintenance on fixed hydrogen leak detection sensors and thoroughly inspect for flammable/toxic vapors.Evi
5、dence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Hardwarea71 LogisticsAdditional Info: Approval Info: a71 Approval Date: 1994-06-03a71 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-,-,-
