Plans for trial just after ER

• Noise investigation about FFUs in the corner stations by an operator

  1. Preparation

     • Make marks on FFU switches that are not turned off in MCE, IFI, PRM, PR3, PR2, BS, SR2, SR3, SRM, OMC with "Pink Tape".
       (Operated FFU / Total FFU) table list is below.
       130 FFUs will be turned off. This corresponds to 26kW heating power.
       26kW corresponds to about two water cooler cooling power (2 x 14kW). We expect balance.

  Area Name

  MCF

  MCE

  IFI

  PRM

  PR3

  PR2

  BS

  SR2

  SR3

  SRM

  OMC

  Present FFU(151)/Total FFU(180)

  1/16

  2/16

  12/12

  12/12

  16/16

  20/20

  20/20

  20/20

  16/16

  16/16

  16/16

  several FFUs are disorder

  Remained FFU(35)/Total FFU(180)

  1/16

  2/16

  2/12

  2/12

  4/16

  4/20

  4/20

  4/20

  4/16

  4/16

  4/16

• ||

  Area Name || IEXYV ||

  Present(2)/Total(10)

2. Method(1)
   • Take a sensitivity by an operator.
   • 4 people stand by (MCE, IFI, PRM), (PR3, PR2, BS), (SR2, SR3), (SRM OMC) FFU switchs.
   • Turn off almost FFUs at the same time by 4 people, except for pink one.
   • Take the sensitivity again before alignment will change.

   • Check the difference btw FFU operation and almost no FFU operation.
     

3. Method(2): If the alignment change is too huge for us to take a sensitivity.
   • We turn off IYC-C and BS-C coolers at the same time when we turn off 130 FFUs.
   • Take sensitivity uegently if possible.
   • Check the temp changes in the corner station.
   • If the temp seems to go down rapidly, we enlarge heating power. If the temp gose up rapidly, we turned on IYC-C again and heat up by heaters.
   • we expect do some try and error for several hours if we encounter serious temp change.
   • If alignment comes back, take sensitivity.
   • If it will take too much time to recover FPMI, we give up this trial.