ML20039C772
| ML20039C772 | |
| Person / Time | |
|---|---|
| Site: | 07000824 |
| Issue date: | 11/19/1981 |
| From: | Olsen A BABCOCK & WILCOX CO. |
| To: | Crow W NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 19943, NUDOCS 8112300178 | |
| Download: ML20039C772 (7) | |
Text
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Research & Development Division Babcock & Wilcox Lynchburg Research Center a McDermott company P. O. Box 1260 6
Lynchburg, Virginia 24505 p
(804) 384-5111 coCKW November 19, 1981 f
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Dear Mr. Crow:
My letter to you dated October 12, 1981 forwarded the Lynchburg Research Center's plan for decontaminating portions of our site and a section of a railroad right-of-way that is owned by the Chessic System.
The decontamination activity is essentially complete.
Attached figures 1, 2 and 3 show the results of the most recent survey made of the railroad right-of-way.
The Reuter-Stokes pressurized ion chamber was used to make the measurements.
The instrument was calibrated prior to this survey in accordance with an agree-ment reached between our Health Physicist and Dr. D. M. Montgomery of Region II NRC.
The measurements indicate that the areas meet the target criteria and are ready for a confirmatory survey by Region II and subsequent release.
The two culverts under the railroad tracks, mentioned in the plan, remain con-taminated. They have had mud removed from them, been washed out with water hoses and have been washed with a high pressure water wash system. The maximum activity of 140pR/hr at contact remains. Replacing the culverts is not practical because the tracks would have to be moved during the operation.
During the initial cleaning, no evidence was found that either culvert was used as a habitat for wild-life and both are too small for human occupancy.
For these reasons, I feel the most reasonable solution to this problem is leave them as is and perform an annual surveillance as stated in the plan.
Figures 4 and 5 show the final survey results performed on the two portions of B&W property on either side of the railroad right-of-way.
The instrument used and it's calibration are as described above.
The disposition of this land re-mains as described in the plan.
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, As stated in the plan, the contaminated soil that has been removed from the areas covered above will be placed in a storage bunker which is presently being con-structed. The time for this soil to decay to the target criteria of 10pR/hr was estimated to be 20 years.
This estimate has been improved on since the comple-tion of the soil removal.
Samples indicate a concentration for Cobalt-60 of 47pci/ gram and for Cesium-137 of 4.7pCi/ gram.
To reach the target criteria, the Co-60, the activity should be reduced to about SpCi/ gram.
This level will be reached after 17.2 years after which time the Cs-137 will have decreased to 3.2pci/ gram. Additional samples will be taken and analyzed after the soil is loaded into the storage bunker and a final retention time will be calculated.
For the purposes of the plan, the stated retention time of 20 years still appears to have sufficient conservatism to assure that the target criteria will be met prior to release.
Yours very truly, BABCOCK & WILCOX COMPANY Lynchburg Research Center
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Arne F. Olsen Senior License Administrator AFO:ccf Attachment (s) cc: Mr. D. M. Montgomery Region II i
FIGURE 1 8
10 11 9
10 1C All readings in microioentgens per hour 8
11 12 including backgroung.
Nadings taken with 10 10 14 Reuter-Stokes pressurized ion chamber.
X 7
10 16 Grid size - 10' X 10' 8
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FIGURE 2 i
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34 15 All readings in I
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microroentgens per hour including background.
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1F Readings taken with 12 17 Reuter-Stokes pressurized 11 14 16 ion chamber.
14 16 16 13 15 1R Railroad liainline 12 12 17 12 13.
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FIGURE 3 8
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All readings in g5 33 34 g
microroentgens per hour t-
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including background.
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l Readings taken with
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Reuter-Stokes pressurized ion chamber.
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x 9
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6 PROPERTY i
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1 All readings in microroentgens per hour 14 la 22 in 13 including background.
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Reuter-Stokes pressurized j
ion chamber.
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R. R. Property 7
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FIGURE 5 CNIAL 3
All readings in microroentgens per hour 7.
including background.
Readings taken with Reuter-Stokes pressurized 7
ion chamber.
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