The Overflow Tank:

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This wrench is needed to open the hatch of the Overflow Tank.  It is kept behind the Control Panel door.  Unscrew the protection plug and use the wrench to open the hatch.

 

The Overflow Tank is not used as part of the normal operation of the SPS.  The tank was originally part of the old Sewer Treatment Plant, and upon its abandonment in 2002, it was designed into the operating concept of the new SPS.  It’s purpose is only to provide emergency backup storage of sewage in the unlikely event that both main pumps in the Wetwell fail for some reason.  The most likely scenario for using the Overflow Tank would be if there is an extended power outage and the
Emergency Generator fails as well.

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