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MP3 report – week 18-19 03/05/2010 – 09/05/2010 13 actions

MP3 report – week 18-19 03/05/2010 – 09/05/2010 13 actions. MP3/QPS team in CCC. Interventions evolution. In average 2.5 intervention per day. Recovery after Tech Stop. Easter WE. Average of 2.5 “urgent” interventions per day. Tech Stop. RU.R4 and RU.L4 Trips.

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MP3 report – week 18-19 03/05/2010 – 09/05/2010 13 actions

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  1. MP3 report – week 18-19 03/05/2010 – 09/05/201013 actions MP3/QPS team in CCC LMC: 12th of May 2010

  2. Interventions evolution • In average 2.5 intervention per day Recovery after Tech Stop Easter WE Average of 2.5 “urgent” interventions per day Tech Stop Monday Morning Meeting : 3rd of May 2010

  3. RU.R4 and RU.L4 Trips • RU.R4 and RU.L4 tripped on 07/05 within 6 minutes: R4 due to faulty current reading; L4 due to (well-known) U_RES drift. Coincidence? real current I_DCCT current reading threshold I_DCCT = 150 A with open switch U_RES drift over several days LMC: 12th of May 2010

  4. nQPS loss of internal communication • Loss of internal communication of DQAMGS controllers in S67 (05/05) and S56 (09/05). • Under these circumstances correct functioning of nQPS cannot be guaranteed. May be masked at injection level, but not for ramp! • Requires a power-cycle of the controller that triggers switches to be opened. Consequently heaters were fired (31R6 on 05/05) and (16L6 and A17L6 on 09/05). Heaters fired nQPS controller problem LMC: 12th of May 2010

  5. Other issues since May 2nd • 03/05: all 600 A circuits now part of software interlock system preventing injection. Spurious triggers averted by additional logic. • 04/05: Water-pressure problem affects RD1.R2 and RQ9.R2B2. Problem fixed by access. • 04/05: Splice-measurement on 6kA bus-bars on IPQs started left of 8. • 06/05: RQD/F.A45 global bus-bar protection triggered as consequence of an 18 kV power converter failure on the surface. • 07/05: Unstable circuit board causes trips of RQTL11.R2B2, fixed on 11 May by MPE piquet • 08/05: U_Lead voltage readings wrong on board A of RQTL11.L5B1 and RQS.L7B2. For now running on board B. Waiting for the next technical stop LMC: 12th of May 2010

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