ML092720434
| ML092720434 | |
| Person / Time | |
|---|---|
| Site: | 07000925 |
| Issue date: | 11/02/1989 |
| From: | Rogers W Cimarron Corp |
| To: | Region 3 Administrator |
| Shared Package | |
| ML092720355 | List:
|
| References | |
| Download: ML092720434 (23) | |
Text
Pu Plant Laboratory Drain System The laboratory drain system consisted of two seperate drain systems.
The uranium laboratory room drain system was located in Room 140 and exited the building through the east wall and term-inated in the 10,000 gallon collection tanks.
This system consisted of approximately fifty two feet of two inch durcon pipe under the floor of Room 140.
The Plutonium laboratory rooms drain system serviced most of the laboratory area and exited through the build-ings north wall and terminated in the 10,000 gallon collection tanks.
This system consisted of approximately 335 feet of two inch durcon pipe.
Since the uranium drainage system was contaminated to approxi-2 mately 500 dpm/100 cm smearable and was concentrated in one room we decided that it would be easier to remove this small system (Figure #1).
This was accomplished by using a concrete saw to cut around the up risers, breaking out the concrete, and digging up the pipe.
We performed a release survey on all concrete that was re-moved.
All dirt was drummed as it was removed.
All joints were inspected for leakage and surveyed for detectable contamination.
After the pipe was removed each hole was surveyed with an Eberline PRM-5 with PG-2 garma probe and soil samples were taken.
Since no contamination problems were detected the dirt was then returned to the hole.
Our initial plan was to clean and survey the Pu drain system (figure #2 and #2A).
To accomplish this, we saw the need to acquire some special detectors and to prove that this system was leak proof.
We initially removed a portion of this system outside of the build-,;-
ing between the building and the 10,000 gallon tanks and installed a sight glass riser on the pipe at the lower level outside of the building (Figure #3).
We proceeded to fill the entire system under the building with water to the floor level and marked the water level in the sight glass riser.
The results of out initial leak test indicated a leak rate of approximately 0.5 gallons of water per minute in this remaining system.
In an attempt to locate this leak we decided to remove the line from under rooms 141,
- 142, 143,
- 140, and 132 since we already had access under the floor in room 140.
We also decided to cut a hole in the northwest corner of room 129 and to seperate the drain line there for our next leak test (figure #4).
Our second leak test consisted of the remaining drain system in the laboratory area only.
We installed two standpipes, one in the northwest corner of room 129, and the other in room 132 north-west corner (Figure #4).
After filling this portion of the drain system with water, we still indicated a leak rate of approximately 0.5 gallons per minute.
Because of the results of this leak test we continued to remove Pu drain line until we found a wet area in room 135.
This wet dirt was drummed seperately and labeled as possibly contaminted dirt (Figure #5.)
As we continued to remove dirt at this location we found an elbow at approximately 6 feet below floor level with the back of the elbow broken out.
Since there was only approximately 35 feet of this drain system left in the laboratory area, we decided to complete removal of this system from the labo-ratory area (Figure #6).
Our third leak test consisted of the drain line from the northwest corner of room 129 to the north wall of the Pu bulding (Figure #7).
After this portion of the system was filled with water and left 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> it indicated no leakage from this part of the system.
This is a straight run of approximately 82 feet of two inch dutcon pipe that runs through the exhaust ventilation tunniel arid under the production hall thru room 127 (Figure #7).
Initial smearable results indicated approximatley 1000 dpm/100 cm2 smearable in this pipe.
We used a rotating steel brush with a water 2
flush to clean this pipe to less than 20 dpm/l0O cm smearable.
We built a cylindercial gas proporational alpha detector to pull through this line for our direct survey.
Our initial survey indicated approximately 50% of our readings were still above 100 dpm/100 cm2 and a maximium of 408 dpm/100 cm2 (Figures #8A, B,C,). After recleaning the pipe with a brush hone our results were all less than 100 dpm/100 cm2 direct and less than 20 dpm/100 2
cm smearable (Figures #gA,B,C,D,E,F,G).
W. A.
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