1 / 25

Specific Hazard Report Comments

Specific Hazard Report Comments. Structures Materials Electrical Procedures & Operational Controls Crew Hazards Radiation Other. HR Preparation. Typical comments related to payload hazards Based on Statistics from PSRP. SDP & HR COMMENTS - Structures. SDP & HR COMMENTS - Structures.

reid
Télécharger la présentation

Specific Hazard Report Comments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Specific Hazard Report Comments Structures Materials Electrical Procedures & Operational Controls Crew Hazards Radiation Other

  2. HR Preparation Typical comments related to payload hazards Based on Statistics from PSRP

  3. SDP & HR COMMENTS - Structures

  4. SDP & HR COMMENTS - Structures • General Structures & Collision • Reference review of fracture control plan in the safety verification methods • References Material Usage Agreements (MUAs) when none have been identified • Address composite/bonded structures testing and analyses in verification • Reference materials certification in verifications • Address interface load verifications • Summarize vibration test and analysis details • Address fastener integrity documentation • Provide consistent factor of safety numbers • Provide testing and analyses detail to demonstrate controls • Provide complete limited life item assessments

  5. SDP & HR COMMENTS - Structures • Structures/Mechanisms • Provide data to identify that safety critical mechanism meets TA-94-041 criteria • Include drawings that detail safety devices • Summarize development/qualification testing • Provide details for tolerances within the mechanism guides & attach points • Provide details pertaining to launch lock data • Assess mechanisms failures based on worst case loads • Assure that safety margin/factor terminology are used appropriately in analysis • Assess both fault tolerance to inadvertent operation and failure-to-operate hazards • Identify methods to clearly define positive indication of mechanism status • Assure that force and torque margins are accounted for in assessment • Include summary analysis, tests, and inspections used to meet TA-94-041 • Provide system descriptions in PSDP that address design requirements and environment • Address functional testing before and after exposure to acceptance/qualification testing

  6. SDP & HR COMMENTS - Structures • Rotating Equipment • Provide details regarding worst case speeds of flywheels, centrifuges, and fan blades • Identification of all rotating equipment • Provide fan specification sheets • Use worst case voltage to determine maximum fan speed • Provide containment analysis for fan blades. • Fasteners: • Summarize fastener control requirements • Provide fastener integrity plans • Assure combinations of lot testing, manufacturer and distributor audits, and verification tests for mechanical properties are addressed • Provide certificates and manufacturer test reports for fracture critical and low-risk parts

  7. SDP & HR COMMENTS - Structures • Fracture Control • Provide fracture control summaries and parts classifications • Provide definition of maximum rotating component speeds and manufacture tables • Vented and Sealed Containers • Identify and assess sealed containers • Try not to confuse pressure systems and sealed containers • Address venting requirements in Interface Control Document requirements • Interface Hazards • Clearly define use of STS/ISS controls that provide safety features • Assure that ISS rack safety assessments address different payload configurations • Define Extravehicular Activity (EVA) interfaces

  8. SDP & HR COMMENTS - Materials

  9. SDP & HR COMMENTS - Materials • General Materials • Provide data to address susceptibility to stress corrosion cracking in support brackets, mounting hardware, or other payload structure • Provide MUAs for stress corrosion cracking • Toxicity • Provide complete current list of sample materials • Provide hazard level, concentration, volume, and/or number in material list • Provide summary of conditions and configurations of materials used in experiment • Identify controls and verifications to demonstrate independent levels of containment • Containment • Develop verifications to demonstrate independence of containment levels in HRs • Provide assessments that show containment at reduced pressures for EVAs and bailout

  10. SDP & HR COMMENTS - Materials • Offgassing • Address offgassing test plans in HR controls and verifications • Address materials selection criteria in HR controls and verifications • Provide MUAs with HR support data • Flammability/Flammable Atmospheres/ Flammable Materials/Ignition Sources • Identify areas that may collect flammable gasses • Address electric static discharge (ESD) in flammable atmosphere assessment • Provide materials compatibility assessment of interfacing materials • Clearly define testing, ESD controls, and grounding techniques in SDPs/HRs • Develop flammability assessments • Identify operational controls for flammable material usage • Provide MUAs in the SDPs/HRs • Develop controls and verifications to control ignition sources

  11. SDP & HR COMMENTS - Electrical

  12. SDP & HR COMMENTS - Electrical • Electrical Power Distribution Circuitry • Provide schematics to identify wire size/fusing for appropriate wire derating provisions • Provide up-to-date schematics that identify circuit protection devices • Assure circuit protection devices are rated for wire size • Electric Shock and High Voltage • Assess electric shock hazards during payload operations • Identify worst case voltages and currents within the equipment electrical systems • Describe verifications for inspections/testing of chassis ground • Describe bonding and grounding techniques in verifications • Identify high voltages of electrical systems in SDPs/HRs

  13. SDP & HR COMMENTS - Electrical • Connector Mate/Demate • Develop verifications to demonstrate compliance with MA2-99-170 • Assess and determine applicability of connectormate/demating hazards • Bonding and Grounding • Provide schematics to demonstrate accurate grounding provisions • Assess and develop verifications to demonstrate compliance with MA2-99-142

  14. SDP & HR COMMENTS – Procedures & Operational Controls

  15. SDP & HR COMMENTS – Procedures & Operational Controls • Procedures and Operations • Develop a rapid safing assessment • Address crew procedures used to control payload hazards in SDP/HRs • Identify maintenance procedures in HR controls and verifications • Address manufacturing and processing procedures used to verify controls • Assess and summarize whether computer processing may result in a catastrophic hazard • Provide fire detection and suppression approach in SDP • Assess and determine if EVA procedures are required for control of a hazard • Assure that hazardous commanding and hazardous command tables are accurate • Address anomalies related to design, manufacturing, and handling procedures

  16. SDP & HR COMMENTS – Crew Hazards

  17. SDP & HR COMMENTS – Crew Hazards • Shatterable Materials and Debris • Assess potential shatterable materials/debris and potential escape paths • Provide shatterable materials list and identify method of containment • Identify if optical glass is used • Develop verifications to demonstrate controls for each component • Sharp Edges • Assure verifications to assess sharp edges caused by manufacturing processes • Identify if use of protective covers are required and address in controls and verifications • Lasers • Identify use of lasers in PSDP and provide specifications including power, wavelength, category, type, and classification • Pinch Hazard and Crew Injury • Address whether procedural controls are required to preclude pinch points

  18. SDP & HR COMMENTS – Radiation

  19. SDP & HR COMMENTS – Radiation • Electromagnetic Interference (EMI) • Provide a summary of the EMI source in SDP • Assess hazards related to EMI susceptibility • Address EMI waivers in HR verifications • Radio Frequency • Reference waivers to ICD in SDP/ HRs • Assess whether the ICD violations are hazardous to other payloads or STS/ISS • Provide schematics to demonstrate safety devices to preclude RF threat • Ionizing Radiation • Assess whether there are any radio isotopes, if none then state so in the SDP • Provide JSC Form 44 to identify total radioactivity units per sample (uCi/sample)

  20. SDP & HR COMMENTS – Other Categories

  21. SDP & HR COMMENTS – Other Categories • Pressure Systems • Determine Maximum Design Pressure (MDP) by defining the two worst case failures • Address freeze/thaw cycles of cryogenic and hypergolic systems • Identify ground filling procedures in HR causes, controls, and verifications • Assure lines, fitting, and components factors of safety are determined • Address materials compatibility and material failures (e.g., corrosion) in components • Provide pressure system tables to address pressure ratings of all lines, fittings, and components • Provide pressure system diagrams that detail the geometry of system • Develop and provide pressure vessel qualification program summaries

  22. SDP & HR COMMENTS – Other Categories • Batteries • Address all batteries in SDP/HRs including those in memory and circuit cards • Provide details such as cell size, number, current, chemistry, type, capacity, serial/parallel circuitry, and vendor specification sheets • Provide schematics to show controls for leakage, short circuit, and overcharging • Provide acceptance testing plans and include as HR verification support data • Address testing to demonstrate no leakage concerns • Identify cell materials on the hazardous material summary table • Assure battery boxes include absorbent material to preclude electrolyte leakage hazards

  23. SDP & HR COMMENTS – Other Categories • Thermal Extremes • Provide IVA/EVA touch temperatures assessments and determine EVA keep-out zones • Develop thermal analysis/testing summaries to address worst case thermal profile • Include use of temperature strips as applicable

  24. SDP & HR COMMENTS – Other Categories • Verifications • Provide verifications that correlate with controls • Develop verifications that demonstrate controls by identifying test, analysis, inspection, or procedures to clearly discern pass/fail criteria • Assure verification items clearly show independence for each control • Assure schedules for completion of verifications are consistent with processing of hardware at KSC • Provide description of reverification activities in RAs • Assure on-orbit verification is considered in PSDP and HRs

  25. SDP & HR COMMENTS – Other Categories • Document Enhancements • Verifications should be developed to clearly demonstrate methods to assure controls • Provide HR support data, including schematics, drawings, and analyses to support controls and verifications • Assure Phase III HRs do not contain TBDs • Ensure RAs address hardware changes • Provide a VTL to identify open verification activity • Develop and include an operational control list in the PSDP • JSC Form 1230 should not be not used as a checklist, rather it is 16 hazard reports

More Related