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AMS-02 Permanent Magnet. Safety Impact. General Safety Approach. Building on Existing AMS-02 Safety Analysis and documentation Following Order of Precedence of Hazard Control in New Hazard Analysis Remove Hazards Eliminated by design change. Establish if New Hazards Created

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slide1

AMS-02 Permanent Magnet

  • Safety Impact

AMS-02-PM Design Review - May 4-5, 2010

general safety approach
General Safety Approach
  • Building on Existing AMS-02 Safety Analysis and documentation
  • Following Order of Precedence of Hazard Control in New Hazard Analysis
    • Remove Hazards Eliminated by design change.
      • Establish if New Hazards Created
    • Examine Rationale for Design for Minimizing Risk
      • New and altered DFMR
    • Examine Active/Automatic Control Methodologies for Hazards for Impact
    • Examine use of Procedural Controls/Warnings

AMS-02-PM Design Review - May 4-5, 2010

general safety approach1
General Safety Approach
  • Update to Hazards
    • Review Validity of Existing Causes
      • Look for New/Changed Causes
    • Review Validity of Existing Controls
      • Look for New/Changed Controls
    • Review Validity of Existing Verifications
      • Look for New/Changed Verifications

AMS-02-PM Design Review - May 4-5, 2010

hazard reports
Hazard Reports
  • AMS-02-F01 – Structures
    • New/Changed Structures and Loading Conditions
      • Control 1.1 may require update
    • VC becomes Vented Structure
      • Control 1.5 may require update
    • New Materials
      • New Composite Structural Elements
        • Control 10.1 may need updating to reflect protection methodology of new carbon fiber planes/containment
      • Plane 1N to use heaters in conjunction with composite structures.
        • Add Control 1.7 for heater control methodology.

AMS-02-PM Design Review - May 4-5, 2010

hazard reports1
Hazard Reports
  • AMS-02-F01 (cont)
    • New Fasteners/Heritage Fasteners
      • Control 4.1 may require update (Quality)
      • Control 5.1 may require update (Backoff)
    • No Welding of Structures with PM
      • Change Controls of Cause 6 (Welding) to address heritage welded structure of permanent Magnet
    • Removal of Non-linear Straps
      • Remove Control 1.2
      • Remove Cause 8

AMS-02-PM Design Review - May 4-5, 2010

hazard reports2
Hazard Reports
  • AMS-02-F02 – Offgassing
    • No changes made to DDRS-02 in Orbiter
    • DDRS ISS will be documented separated from AMS-02

AMS-02-PM Design Review - May 4-5, 2010

hazard reports3
Hazard Reports
  • AMS-02-F03 – Cryogenic System
    • Cryomagnet System Removed
      • Withdraw Hazard Report

AMS-02-PM Design Review - May 4-5, 2010

hazard reports4
Hazard Reports
  • AMS-02-F04 – Over P Payload Bay
    • Super Fluid Helium Tank Removed
      • Remove Cause 1
      • Remove Cause 2
    • Warm Helium Gas Supply Removed
      • Remove Cause 3
    • TTCS fill quantity may change
      • Control 5.1 will require modification to reflect change.
      • TTCS will have new components and unwelded connections.
    • Cryocoolers and Cryocooler Loop Heat Pipe Removed
      • Remove Control 5.2, 5.6
    • Cryomagnet Avionics Box (CAB) Loop Heat Pipe Removed
      • Remove Control 5.5
    • Alterations in Blanket/MLI Usage
      • Reopen review of applications for blockage issues.

AMS-02-PM Design Review - May 4-5, 2010

hazard reports5
Hazard Reports
  • AMS-02-F05 – Pressurized Systems
    • Warm Helium Gas Supply Removed
      • Remove Control 1.3, 5.2, 7.3, 8.2, 9.2
      • Update Control 10.1 to remove Warm Helium Gas Supply
    • Cryocoolers/Cryocooler Loop Heat Pipe Removed
      • Remove Control 1.10, 1.11, 5.8, 8.8, 8.9
    • CAB Heat Pipe/ Loop Heat Pipe Removed
      • Update Control 1.8, 8.6 to delete CAB HP.
      • Remove Control 1.9, 5.7, 8.7
    • TTCS Modified
      • Update Control 1.4, 5.3, 8.4, 8.11 for fill quantity change and any impact to MDP
      • New loop and components, non-welded connections to be used.

AMS-02-PM Design Review - May 4-5, 2010

hazard reports6
Hazard Reports
  • AMS-02-F06 – Thrust/Overturning Moments
    • All Cryosystem Sources Removed
      • Remove Control 1.1, 1.3, 2.2, 2.4, 2.5
      • Update 2.1 for removal of cryosystem vents
      • Update 2.3 for the removal of Warm Helium Supply and it’s fill caps
      • Remove Cause 5, Sloshing of Superfluid Helium
    • All Warm Helium Sources Removed
      • Remove Source of Thrust Potential
    • Magnetic Field has new characteristics
      • Update Control 4.1 to reflect lower magnetic field intensity and its resulting torque difference.
    • Magnetic Field can not be shut off
      • Control 4.2 needs to be changed to address compatibility of AMS-02 PM field with the Orbiter, SRMS and SSRMS
    • Magnetic Field is no longer variable
      • Remove Control 4.3 (Quench)

AMS-02-PM Design Review - May 4-5, 2010

hazard reports7
Hazard Reports
  • AMS-02-F07 – Radiated Fields, EMI, Magnetic
    • Magnetic Field is less strong, nonvarying
      • Substantial rewrite of Controls 1.1 reflect Permanent Magnet design.
      • Control 1.2,review to confirm TIA-310 valid as it envelopes the reduced magnetic field.
      • Sub. rewrite of Control 1.3 to reflect Permanent Magnet does not interfere with Robotic Operations on ISS, Remove required to dissipate field Control 1.11.

AMS-02-PM Design Review - May 4-5, 2010

hazard reports8
Hazard Reports
  • AMS-02-F07 – Radiated Fields, EMI, Magnetic (Cont)
    • Magnetic Field is less strong, nonvarying (Cont)
      • Sub. rewrite of Control 1.4 to address compatibility with Orbiter Operations.
      • Remove Control 1.5 ,1.7, 1.8, 1.9 addressing charging/discharging controls
      • Sub. rewrite of Control 1.4 to address EVA compatibility of new field
      • Remove Cause 3 for charging/discharging effects of magnetic fields on other systems/structures
    • EMI sources from CAB will have to be accounted for in EMI testing results.

AMS-02-PM Design Review - May 4-5, 2010

hazard report
Hazard Report
  • AMS-02-F08 – Electric Shock/Discharge
    • Remove CAB/Cryocoolers
      • Revise Control 2.7 to remove Cryocoolers and CAB heaters
    • Removed Uninterruptible Power Supply
      • Remove Control 1.2
    • New Structure Inside open VC
      • Revisit Bonding Implementation in Control 2.2
    • No Helium Source
      • Revise Control 4.1 to remove helium as a released neutrally charged gas

AMS-02-PM Design Review - May 4-5, 2010

hazard reports9
Hazard Reports
  • AMS-02-F10 – Flammable Materials
    • Cryocooler Loop Heat Pipe Removed
      • Remove Control 2.3 to reflect removal of propylene
    • CAB Heat Pipe/Loop Heat Pipe Removed
      • Remove Control 2.4
    • AMS-02 requires no Power on for Ascent
      • Update Control 3.1 to reflect no power during ascent

AMS-02-PM Design Review - May 4-5, 2010

hazard reports10
Hazard Reports
  • AMS-02-F11 – Mechanism Failure
    • No Mechanisms Add, Removed or Altered
      • No changes to Causes or Control required

AMS-02-PM Design Review - May 4-5, 2010

hazard reports11
Hazard Reports
  • AMS-02-F12 – Mate/Demate of Connectors
    • Remove UPS
      • Remove Control 1.4
    • EVA Connector Swap to allow for magnet charging after power loss no longer required
      • Still a viable opportunity for the AMS-02 as a contingency EVA action, Control 1.1 must be rewritten to accurately reflect the new configuration.

AMS-02-PM Design Review - May 4-5, 2010

hazard reports12
Hazard Reports
  • AMS-02-F13 – Battery Failure
    • UPS Removed
      • Withdraw hazard report

AMS-02-PM Design Review - May 4-5, 2010

hazard report1
Hazard Report
  • AMS-02-F14 – EVA Operations Hazard
    • New Hardware
      • Review of new hardware/modified hardware for possible sharp edges/ corners/ entrapment
        • Potential impact to Control 3.1
      • New Heaters
        • Need to review for EVA accessibility/thermal control
          • Potential impact to Control 4.2
    • Cryogenic System Removed
      • Control 4.3 rewritten to remove references to extreme cold impingement potential
    • Fixed Magnetic Field
      • Control 8.2 updated to new field strength (entrapment of crew)

AMS-02-PM Design Review - May 4-5, 2010

hazard report2
Hazard Report
  • AMS-02-F16 – Shatterable Material Release
    • New Tracker Planes Added
    • New Tracker enclosure Plane
      • New Design of Tracker planes and replacement plane for plane number 1 must be designed and build in the spirit of Control 1.6 and Control 1.6 updated to reflect details of implementation and new verifications.

AMS-02-PM Design Review - May 4-5, 2010

hazard reports13
Hazard Reports
  • AMS-02-F17 – EPDS Damage
    • UPS Removed
      • Remove Control 2.2

AMS-02-PM Design Review - May 4-5, 2010

hazard reports14
Hazard Reports
  • AMS-02-F18 – Rapid Safing/Payload Reconfig.
    • Cryomagnet replaced with Fixed Magnet that can not be switched on and off.
      • Control 2.2 rewritten to reflect the lower intensity and lack of charging/discharging
    • Removal of Cryosystem, Opening of VC
      • Control 3.2 Revised to remove VC and Helium tank from Control parenthetical note

AMS-02-PM Design Review - May 4-5, 2010

hazard reports15
Hazard Reports
  • AMS-02-F20 – Lasers
    • Removal of Plane Number 1 LBBXs
      • Half of LFCR outputs will no longer be utilized, ports will be blocked.
        • Update Control 1.1 to clarify use of laser output
        • Update Control 1.1 or add Control 2.7 to address use of blocking connectors to close off unused laser ports.
        • Update Control 2.6 to remove reference to “top” tracker plane (Plane number 1.)
    • Possible reconfiguration of thermal blankets
      • Control 2.6 references that the fiber optics are routed exclusively under MLI/blankets. In reconfiguration of AMS-02 Thermal Management, all blankets may not required and installed.

AMS-02-PM Design Review - May 4-5, 2010

hazard reports16
Hazard Reports
  • STD-AMS-02-F02 – 1230 DDRS-02
    • No Changes

AMS-02-PM Design Review - May 4-5, 2010

verifications
Verifications
  • Previous pages did not highlight verifications that have already been identified as potentially being impacted by this redesign.
    • Verifications that are no longer relevant
    • Verifications that have to be reexamined for applicability
    • Verifications that must be reopened and closured activities redone
    • New Verifications
  • The plan is to review all Verifications that move forward in the safety process to confirm their status.
  • A new SVTL will be developed in conjunction with a new Verification Tracking Tool.

AMS-02-PM Design Review - May 4-5, 2010

safety review
Safety Review
  • All updated safety documentation will be processed through the Payload Safety Review Panel in accordance with NSTS/ISS 13830.
    • DDRS ISS will be processed separately through the applicable safety processes

AMS-02-PM Design Review - May 4-5, 2010