Sump/Tank Cleaning

[sollenbergert@nimo.com]

We have two radiologically contaminated floor drain sumps which require
cleaning.  The sumps are 30 feet deep, 8 feet wide, and 8.5 feet long.
They have a nominal operational depth of 1.5 to 7 feet.  Under water dose
rates in contact with the sump contents are 1.5 - 20 R/h.  The sump
contents include high conductivity water, sludge, clay-like material,
electrical tie-wraps, rubber gloves, duct tape, and a lot of organic
growth.  The non-fluid sump contents are 2 inches to 2 feet deep.

We're hoping to elicit the following information from commercial nuclear
power plants, organizations performing DOE related clean-up activities
(e.g., Savannah River or Hanford), or other groups involved in similar
clean-up efforts.

1.  Have you or your organization successfully cleaned out sumps or below
ground tanks with depths greater than 28 feet?

2.  If so, what was your basic clean-up methodology?  For example:  Did you
lance, slurry, and pump remotely or did you have personnel enter the
sump/tank for cleaning?

3.  What type of pump did you use?  Describe your suction and discharge
hose length, vertical lift, and discharge height.

4.  How did you dispose of the sump/tank contents/debris?

5.  Describe any related lessons learned, good practices, or problems
encountered.

Response may be private to myself or post to the list server if you feel
this information will be of interest to other RADSAFE users.

Thanks for your help.

Timothy D. Sollenberger
315-349-1471
sollenbergert@nimo.com




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