TSU CONS Reliability Meeting - 7

Present: M. Blaszkiewicz, L. Felsberger, N. Voumard, P. Van Trapen

Minutes

FMECA

The meeting was focused on discussing the FMECA table after detailed end-effects assignment step performed by Nicolas. The slides present the total failure rate numbers as well as highlights for each individual category. 

Additional clarifications on the meaning of end-effects assigned by Nicolas:

• no effect failures may sometimes have impact for other systems,
• downtime - tsu needs to be replaced, cannot rearm,
• no diagnostics - almost same as above,
• loss of injection permit - almost same - just during injection,
• unpredictable:
  • for FPGA, the worst case async dump,
  • D2, IC18, IC41 should not lead to async,

During fmeca added connection to fpga, to trigger sync dump from other tsu

It was reiterated that the rotary switches are used only for read at start up.

Additionally, the following changes were proposed:

• IC31, IC39, IC29, IC43 - may also trigger async dump; marked as asynchronous and no effect.
• Analyse the following possibility: fuse short --> short on VME --> asynchronous dump.
• Review F3, F4, F5.

Actions

1. A smaller meeting in the following week to conclude the assumptions for the hybrid MC model. (Milosz)
2. Review of the FMECA file and upload of the updated version (additional asynchronous dumps, fuses, unpredictable end-effect). (Nicolas)