ML092720492
| ML092720492 | |
| Person / Time | |
|---|---|
| Site: | 07000925 |
| Issue date: | 11/02/1989 |
| From: | Rogers W Cimarron Corp |
| To: | Region 3 Administrator |
| Shared Package | |
| ML092720355 | List:
|
| References | |
| Download: ML092720492 (45) | |
Text
LAB ATTIC SURVEY When decommissioning started in the Laboratory area the laboratory attic was isolated from the laboratory rooms by a sheetrock ceiling.
This attic area contained three contaminated systems plus numerous electrical, plumbing and duct systems.
The contaminated systems were:
- 1. Hood and slotbox exhaust system:
Approximately 500 dpm/100 cm2 smearable maximum internal contamination that was pro-cessed as LSA waste.
- 2.
Glovebox exhaust system:
Approximately 20,000 dpm/100 cm2 smearable maximum internal contamination that was pro-cessed as TRU waste.
- 3.
Vacuum transfer system:
Approximately 100,000 dpm/100 cm2 smearable maximum internal contamination that was pro-cessed as TRU waste.
After these systems were removed and all the equipment was removed from the rooms below, we removed the sheetrock ceiling and steam cleaned the entire attic area.
After steam cleaning, we sur-veyed the attic area with an Eberline PRM-6 and removed all hot spots that were found.
We followed our PRM-6 survey with a spot release instrument survey (PRS-2-Ludlum 43-5 detector) and removed all hot spots that were found.
Before the final release survey was started we used a water hose and wet vac and washed down the entire laboratory.
This survey includes the Laboratory Attic walls, and ceiling.,j All readings are recorded in disintegrations per minute above back-ground.
The walls were grid into approximately 2 meter squares and five reading per grid were taken with Ludlum 2220's and Ludlum 43-68 2
alpha detectors.
No readings greater than 100 dpm/100 cm smear-able were detected during this survey.
The Laboratory attic grating survey was included in each room survey for the Laboratory area.
(2,jf,
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Laboratory Attic Supply Duct Survey After our initial cleanup and surveys in the laboratory attic we used a Ludlum 2220 with a Ludlum 43-4 probe and propane gas to take four readings every 2 meters along the outside of this supply duct system.
We have included a maps of this supply duct system indicat-ing the survey points.
Of the 562 survey points we found one reading greater than 100 dpm/100 cm2 direct and no reading greater than 20 dpm/100 cm2 smearable on the outside of this supply duct.
We scanned the area around this reading and deconed to less than 100 2
dpm/100 cm After completion of our outside survey of this supply duct, we used the same instrument and took 2 reading inside the outlets into each lab room from this supply.
We have included a map with these outlets marked.
Of the 66 survey points we found no reading greater 2
than 100 dpm/100 cm direct and no reading greater than 20 dpm/100 2
cm smearable W. A.. Rogers,..
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