On Wednesday November 21 at approximately 9am the level of the Remote Handling active sump was inspected and found to be at approximately the 7000L level.  The high level alarm sounds at approximately 5800L.  The high level alarm had been silenced by somebody, and RH staff had not been notified.  It is unknown when the high level alarm was reached.  The total sump volume is 7200L (which if exceeded will cause active water to spill on the lab floor).  The sump was previously inspected about 3 weeks prior, and the level was observed to be well below the high level sensor.  The recent increase in volume was from the RCR lab in the MHESA basement.

The sump contents were sampled and approved for release by RPG.  Sump contents were released on November 22nd using the procedure written in Document #64834.

A sign was put up next to the high level alarm silence button indicating that RH staff must be contacted if the alarm is silenced.

The high level sensor was tested and found to be working properly.