ML20032A475
| ML20032A475 | |
| Person / Time | |
|---|---|
| Site: | 07000824 |
| Issue date: | 10/12/1981 |
| From: | Olsen A BABCOCK & WILCOX CO. |
| To: | Crow W NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20032A476 | List: |
| References | |
| 19799, NUDOCS 8110300115 | |
| Download: ML20032A475 (9) | |
Text
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R. search & D.v.lopm.nl D!vl.lon Babcock & Wilcox tyncheurs
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n a McDermott company P. O. Box 1260 Ol A
tynchburg. Virginia 24505 (804) 384 5111 g
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00cn October 12, 1981 E
OCT 2 01981 >
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Mr. W. T. Crow', Section Leade E
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Uranium Process Licensing Section 5
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- 8. 3 Division of Fuel Cycle and Material Safety gz
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U. S. Nuclear Regulatory Commission
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References:
(a) Letter to Mr. R. G. Page from A. F. OldJn, No gmber 26, 1980, " Soil Decontamination".
N (b) Letter to A. F. Olsen from W. T. Crow, undated, received January 5, 1981.
(c) Letter to W. T. Crow from A. F. Olsen, February 4, 1981.
(d) Letter to A. F. Olsen from W. T. Crow, April 21,1981.
(e) Letter to W. T. Crow from A. F. Olsen, May 26, 1981.
Dear Mr. Crow:
This is to forward the Lynchburg Research Center's plan for decontaminating soil in both restricted and unrestricted areas that were found to contain radioactivity.
To summarize the action taken so far in this regard, I have listed the written communicationu that I have on file.
Reference (a) is the initial notification which I sent alerting your office that activity had been detected outside of our restricted area.
In reference (b) you requested additional information and reference (c) was my response to your request. The interim soil decon-tamination criteria was forwarded to me in reference (d) along with a request for a detailed soil decontamination plan. Reference (e) forwarded a descrip-tion of methods, the Lynchburg Research Center (LRC) planned to use to resolve the situation.
In a telephone conversation with Dr. Shum of your staff, I was informed that reference (e) did not contain sufficient detail for a complete review.
Since that time, the LRC has attempted several methods of decontamination and studied various methods for disposing of and storing the removed soil. As of September 30, 1981, approximatelv $231,000.00 has been expended in this effort and between 6
80,000 cubic feet of soil has been removed.
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. 'Ihe attached plan describes the methods that the LRC will use.to reduce the exposure levels in soil located on ard off B&W property. Our Health Physi--
cist has been in contact with Region II, I&E and both are in agreement on
- the instrument to be used to make the appropriate measurements and.an acceptable method of instrument calibration.
I met with members of your staff.in Silver Springs, Maryland on September 14, 1981 and discussed the-use of the concrete retention basin to store _ the soil removed for the three areas discussed in the plan.
I feel that we reached an agreement that this was an acceptable method for storage.
The attached plan should answer the questions of concern in this project and provide _ sufficient data for you to complete your review.
If, however, 1
there is additional information you require, please call me.
Very truly yours, W
w Arne F. Olsen Sr. License Administrator AFO:cef Attachment i
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Soil Decontamination Plan l
The Babcock & Wilcox Co.
Lynchburg Research Center October, 1981 l
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Railroad Right-of-Way - U restricted Area, not B&W Property) n Figures 1, 2 and 3 show the three sections of the Chessie System railroad right-of-way where radioactive soil was found.
Figure 1 shows the area adjacent to the restricted area of the Lynchburg Research Center (LRC).
The grid shows survey results. All values are in microroetgens/hr. including background. Measurements were made utilizing a pressurized ion chamber instrument. Background is 10pR/hr.
Figure 2 shows the area of the right-of-way that lays between the main line (shown above the survey grid) and the sjur line (not shown on the bottom of the figure).
All numbers are survey results in microroentgens/ hour including background. All measurements were made utilizing a pressurized ion chamber instrument.
Figure 3 shows the area of the right-of-way that lays across the tracks from the LRC's restricted area and adjacent to the 'mrestricted portion of B&W property. All numbers are survey results in microroentgens/ hour including background. All measurements were made utilizing a pressurized ion chamber instrument.
The survey results shown on these figures were made af ter the contaminated soil had been removed.
Two culverts, one 15-inches in diameter passing under the spur line and the other 18-inchee in diameter passing under the main line, have resisted repeated efforts at decontamination.
The highest reading detected in them is 140pR/hr.
It is not practicable to replace these culverts and because neither is a likely habitat for humans or animals, the LRC proposes that subsequent to a confirmatory survey by t'ne NRC's Office of Inspection and Enforcement, these areas of the Chessie System railroad right-of-way bc released for unrestricted use.
The LRC shall perform an-nually a direct radiation survey of the water channel through this property to assure that radioactivity is not migrating from the LRC's restricted area or the culverts. With the exception of the two culverts, the target criteria of 10pR/hr (excluding background) has been met.
After the confirmatory measurements by the NRC, the LRC shall back fill these areas with clean soil to promote proper drainage and seed it with grass to minimize erosion.
w hillside (Restricted area, B&W property)
Figure 4 shows the hillside which is located behind (north) the solid waste storage facility.
This is the hillside over which the storm sewer discharged.
This storm sewer line was diverted to a holding pond so that the only water draining down the hill is from direct rain fall. The dense growth of under-brush and small trees has been removed and con aminated soil has been removed in an effort to reach the target criteria of 10pR/hr (excluding background).
The removed soil is being retained on site.
Figure 4 shows the results of the latest survey performed. The grids with no readings recorded re less than 18.5pR/hr (including background).
Background
is 10pR/hr. Two grids indicate levels above the target criteria of 10pR/hr (excluding background).
The LRC proposer to retain the area outlined by the fence in Figure 4 as a restricted area and remain fenced. The fence line vill be based on radiation levels not exceeding an exposure dose rate of 500mR/yr.
The LRC shall perform a direct radiation survey annually of the property adja-cent to the Chessie System right-of-way to detect any migration of activity towarI the right-of-way.
Subsequent to a confirmatory survey by the NRC, the LRC will cover the excavated areas with at least 4-inches of clean soil and seed with grass to minimize erosion.
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North of Right-of-Way (Unrestricted Area, B&W Property)
The area of B&W property located to the north side of the Chessie System railroad right-of-way where contaminated soil was found is shown in Figure 5.
Decontamination by soil removal was performed in the area adjacent to the Chessie System fence.
Radioactivity appears to be confined to the soil in the bed of a small creek that crosses the property and terminates in the " canal".
All numbers are survey results in microroentgens/ hour (in-cluding background). All measurements were made utilizing a pressurized Ion chamber instrument.
The dashed line on Figure 5. establishes the line beyond which all readings are less than 18pR/hr (including background).
The LRC will establish a restricted area on this property.
The fence line will be based on radiation levelu not exceeding an exposure dose rate of 500mR/yr.
The LRC shall perform a direct radiation survey at the east end of the canal (east is toward the right of the figure) annually to detect any migration of activity.
The LRC shall also sample the water from wells #1 and #2 annually and analyze the samples for the presence of C0-60.
These surveillances will continue until direct surveys of the restricted area show that the target criteria of 10pR/hr (excluding background) has been reached.
1 Soil Retention Radioactively contaminated soil vill be stored in a below grade retention basin.
Th location of the basin is shown in Figure 7.
The basin will be below grade with its top at ground level.
Figure 6 is a construction plan of the basin. The dimensions are not shown because decontamination acti-vities are continuing at the time of this writing. The basin will be sized to accept all of the soil removed from the contaminated areas.
The minimum thickness of the walls will be 8-inches, The minimum thickness of the floor will be 8-inches.
The soil will be placed in the basin and compacted. When all soil is in the basin, the top will be covered with paving, either concrete or asphalt, to grade.
The LRC will sample any water accumulation in the " Holding Tank" annually.
If activity is detected in concentrations exceeding 10% of those specified in 10 CFR 20, Appendix B, Table II, Column 2, the collected water will be pumped to the liquid waste retention basins for disposal as a low 1cvel radioactive liquid waste (ref. license ShM-778, BAW-381, Appendix A, section A.9.3.3).
The estimated activity in the soil to be placed in the retention basin is 100 millicuries of principally Cobalt-60. The estimated retention time is 20-years, af ter which the activity will have decayed to 10pR/hr (exclusing background). When the target criteria of 10pR/hr is reached, periodic sur-veys will no longer be performed.
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William O. Miller, License Fee Management Branch, ADM MATERIALS LICENSE AMENDMENT CLASSIFICATION Applicant:
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License No:
Sem -? V
_ Fee Category:
Application Dated:
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Received: to
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Applicant's Classification:-
The above application for amendment has been reviewed by NMS5 in accordance with 5170.31 of part 170, and is classified as follows:
1.
Safety and Environmental Amendments'to Licenses in Fee Catecorfes IA throuah IH,~2A, 2B, 2C, and 4A (a)
Major safety and environmental (b) fiinor safety and environmental (c)
Safety and environmental (Categories ID through 1G only)
(d)
Administrative >
2.
Justification for reclassification:
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3.
The application was filed (a) pursuant to written NRC
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request and the amendment is being issued for the convenience i
I of the Cormission, or (b), L4ther (State reason):
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