Procedure to be followed after a SOB dump

Additional useful information can also be found in the two other sections:

• how to check that the dump is real;
• the list of relevant DIRC experts.

• there should be a red alarm on the Beta alarm panel for the channel 'DRC SOB LEAK';
• you should have heard some audio messages telling you that the water has been dumped plus some loud noise coming from the 620 hall;
• several alarms should be visible in the ALH:
  • DRC → DRC_GAS-WATER → SOB_WATER_SYSTEM → SOB dump
  • DRC → DRC_GAS-WATER → SOB_WATER_SYSTEM → SOB water level
  • DRC → DRC_GAS-WATER → DRC_GAS_WATER_SIAM → SIAM_8 → Channel 0: sob dump initiated
• there should be several other SIAMs tripped in the DRC → DRC_GAS-WATER → DRC_GAS_WATER_SIAM panel. They are very important to understand why the dump occured and so a snapshot of the corresponding epics panel should be added in the logbook.

The DIRC SOB contains ultra-pure water which cannot be released in a drain ultimately ending in the Bay. That's a County law SLAC has to apply -- there are concerns about the fish health. Therefore, to avoid turning the SOB water dump into an environmental hazard, the following steps must be followed closely and as quickly as possible.

1. Go outside the Cornelius room and turn off the two pumps running during standard operations. Use the panel which is on your left a few meters after the stairs.

   This action must be completed asap, even before letting ES&H know that the water has been dumped. No particular training is necessary to stop/start these pumps.

   In case of heavy rain, do not stop the pumps: a flood in or around IR2 is a more important concern. In such situation, it would be anyway too late to prevent the ultra-pure water from contaminating the water drains.

   Use the two pictures below as guidances.

   
   Pump panel outside IR2 during normal operations: the two pumps are set to the 'AUTO' mode (look at the black-grey buttons in the middle of the picture).
   
   Pump panel outside IR2 in case of a SOB dump: the two pumps are set to the 'OFF' mode (look at the black-grey buttons in the middle of the picture).
2. Notify Mike Hug from the ES&H Environment Protection that the SOB water has been dumped. His SLAC extension is 4042 and his pager number (650) 849-9625.
3. You can also warn the IR2 safety officiers: Joe Kenny, Frank O'Neill or Sandy Pierson.
4. The SOB water must be released up to the top of the hill using the blue mobile pump which is also located outside the Cornelius room.

   Unless there is an urgent need to drop the water, you should not operate the pump yourself.

   • Contact the Site Engineering and Maintenance Service (x8901) to request that a tech. be sent to IR2 to operate the pump.
   • Outside week day time, you can call MCC: they'll take care of your request.
   • Mike Hug normally needs to come in IR2 to estimate the amount of water to be released up-hill and to give the green light.
   
   If you have to operate the pump yourself, use the two pictures below as a guidance.
   
   General view of the secondary blue pump outside the Cornelius room. It is used to pump up-hill the SOB water. To tune its power one needs to slightly pull out the button in the bottom left of the picture (inside the red frame). If it is too tight one can slightly unscrew it.
   
   The key to turn ON/OFF the pump is on the left side of the pump -- see inside the red frame.

   Once all the water has been pumped up, just turn OFF the secondary pump and turn ON the main ones using the same panel as in step 1.