ML20153H146
| ML20153H146 | |
| Person / Time | |
|---|---|
| Site: | 07000824 |
| Issue date: | 04/27/1988 |
| From: | Olsen A BABCOCK & WILCOX CO. |
| To: | Rouse L NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 24285, NUDOCS 8805120144 | |
| Download: ML20153H146 (12) | |
Text
%5 7Mzt RETURN.TO
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uu Babcock & Wilcox M-/87-NNFD REsEARCH LABORATORY a McDermott company P.O. Box 11165 Lynchburg vA 24506 1165 (804) 522 6000
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April 27, 1988 f;
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Fuel Cycle Safety Bran U.S.NUCitAR REGULMORy Q 8/
\\h ATTN: Mr. L. C. Rouse '%hiefcmJj)n
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Nuclear Safety NMSS VI*
U. S. Nuclear Regulatory Commission h Doc %/' jy m
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Washington, DC 20555 7S/ M,T'
Reference:
License No. SNM-778, Docket 70-824
Subject:
Groundwater Monitoring Program Gentlemen:
This is in response to your letter dated March 4, 1988, requesting additional information regarding the Groundwater Monitoring Program at the NNFD Research Laboratory.
Item No. 5 of your letter requested that additions be made to Chapter Number 5 of the license application.
I have taken the liberty of expanding Chapters 5 and 13 to incorporate all the informtion sub-mitted with my October 28, 1987 letter which forwarded this program description, and the information that you requested.
An instruction sheet is attached for entering these pages in the application, BAW-381, Demonstration and Conditions for License SNM-778.
Item No.1 of your letter requested the elevations of the waste tank bottoms.
That information may be found in the key on Figure 13-3.
Item No. 2 of your letter requested the justification for the location and depths of the monitoring wells.
Sections 13.4.1 and 13.4.2 pro-vide that informtion.
Item No. 3 requested background radiological l
i n f orma tion.
That informtion is presented in Table 13-2.
Item No.
4 requested that Figure No.1 of the October 28, 1987 submittal be revised to indicate the units of the 0-100 scale.
Figure 13-3 pro-vides the scale and the figure displays several distances for the well locations relative to the Liquid Waste Disposal Facility.
If additional informtion is required, please call me.
Very truly yours.
BABC0CK & WILC0X 88051 % $ $00427 7000824 NNF Research Laboratory
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A. F. Olten Senior License Administrator jhc d'&$24?l5
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BAW-381 DEMONSTRATION AND CONDITIONS FOR LICENSE SNM-778 REVISION 10 AMENOMENT 0 4
TAKE OUT PAGES PUT IN PAGES I
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Da te Page Re v.
Da te 5-4 9
3/88 5-4 10 4/88 5-5 10 4/88 i
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13-3 8
11/87 13-3 10 4/88 i
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4/87 13-4 10 4/88 l
13-5 10 4/88 4
i 13-6 10 4/88 13-7 10 4/88 4
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Direct radiation monitoring at the site boundary -
continuously.
9.
Accumulated water from the soil retention basin shall be sampled annually and if its activity exceeds 10% of the concentration specified in Appendix B Table 2, Column 2, of 10 CFR 20, the collected water shall be disposed of through the liquid waste disposal system.
- 10. Accumulated water from the Temporary Storage Facility shall be sampled and analyzed once each calendar quarter and if activity exceeds 30 pCi/L Beta-Gamma, an investigation shall be made to determine the cause.
If the leak is from a waste container, action will be taken to prevent further contamination.
If con-tamination is found, Sub-sections 7.2.3.8 and 7.4.1 of this application shall be amended to incorporate the decomissioning of the Temporary Storage Facility.
5.2.3 The evaluation of environmental sampling shall be performed by either the site personnel or a qualified outside concern.
5.3 GROUNDWATER MONIT3 RING 5.3.1 Monitoring System The groundwater beneath the Liquid Waste Disposal Facility (LWDF) shall be sampled periodically to determine the presence of Cesium-137 and Cobalt-60; the primary contaminants in the waste water that is collected in the LWDF.
5.3.2 Sampling Each well shall be sampled nn a quarterly basis for two years, be-ginning in November, 1987.
Af ter this period, if no action level is exceeded, the sampling interval shall be one each year, either in the winter or :pring.
5.3.3 Analysis Each well water sample shall be analyzed for gross beta activity to detect the presence of Cesium-137 and Cobalt-60.
License No SNM 778 Docket No.70-824 Date April,1988 Amendment No.
0 Revision No.
10 Page 5-4 Babcock &Wilcox a McDermott company
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5.3.4 Action Levels and Actions to be Taken Gross beta activity exceeding 1.0 E-7 uCi/ml shall require the following actions:
1.
Increase the well sampling interval.
2.
Prepare and implement a plan to determine the source of the activi ty.
3.
Submit a report to the NRC Region II Office.
5.3.5 Records Records of well sampling and analyses shall be retained at the NNFD-RL until the NRC authorizes their disposition.
These records shall include the sample date, analytical results, each instance that the action level was exceeded, the actions taken, any changes made to the system, and all reports made to the NRC, O
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License No SNM 778 Docket No. 74824 Cete April, ?909 Amendment No.
O Revision 6 Page 5-5 3 a;
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13.4 GROUNDWATER MONITORING 13.4.1 Monitoring System The groundwater monitoring system is installed in compliance with Condition No.13, License SNM-778, as renewed on July 30, 1987. The purpose of the monitoring system is to monitor the groundwater under the Liquid Waste Disposal Facility (LWDF) for radioactivity that may be released as a result of tank leakage.
The five wells are positioned around the LWDF.
The wells are drilled to depths that permit the sampling of the groundwater at the interface of the soil and bedrock.
The depths of the wells are shown in Table 13-1.
i TABLE 13-1 NNFD-RL MONITOR WELL CONSTRUCTION DETAILS I
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Bottom Top Top of of of Total Well No.3 Screen Screen Ca sing Depth 1
63 43 2
65 2
46 31 2.5 52 O-3 57 37 3
60 4
48 33 3
50 5
60 40 2.5 104 fDepth below grade in feet.
Height above ground in feet.
3 Well locations are specified in Fig.13-3.
13.4.2 Constructions Details The wells are constructed of four-inch Schedule-40 PVC pipe and PVC screen.
They are drilled using the air rotary technique to avoid the introduction of any contaminants or substances from the drilling mud.
The screens are set inside a temporary casing and a sorted i
l Lloones No SNM 778 Docket No.70-824 Date APPII* 1980 O
10 13-3 Amendment No.
Revision No.
Page Babcock & Wilcox a McDermott company
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sand filter pack placed around the well screens. Above the well screens, bentonite pellets were installed to seal off the sand and then the wells were grouted to the surface.
A protective well pad and lock system has been placed around each well.
In the vicinity of the Liquid Waste Disposal Facility, the bedrock surface is very uneven and steeply dipping.
Thus, the zone at which ground water is encountered and the flow characteristics for the five wells varies considerably.
For example Well #3 produced about ten gallons per minute, which is a relatively significant flow, whereas most of the other wells produced only a small quantity of water and only have a few feet of water in them. Well #5, upon completion, is a dry well.
The quantity of shallow ground water which will be present beneath the LWDF will depend on the antecedent rainfall conditions.
During the wet season, it is anticipated that all five wells will have sufficient water for sampling purposes.
The highly variable hydrogeologic conditions encountered at the LWDF are quite characteristic of this particular area where the rocks are steeply dipping and fractured and there is a steeply sloping top-ography.
The initial analysis results from the November,1987 samples are presented in Table 13-2:
O TABLE 13-2 U
NELL SAMPLE ANALYSIS FOR NOVEMBER, 1987 Well #1 2.12 E-9 uCi/ml Well #2 2.03 E-9 uCi/ml Well #3 2.72 E-9 uCi/mi Well #4 1.34 E-9 uCi/ml Well #5 No Water 13.4.3 Sampling Each of the five wells will be sampled on a quarterly basis for two years, beginning in November, 1987.
Af ter this period, if no action level is exceeded, the sampling interval will be once each year, in the winter or spring.
License No SNM 778 Docket No.70-824 Date April, 1988 0
10 13-4 Amendment No.
Revision No.
Page Babcock &Wilcox a McDermott company
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13.4.4 Analysis Each well sample will be analyzed for gross beta activity to detect the presence of Cesium-137 and Cobalt-60.
These are the principle isotopes present in the liquid waste system.
13.4.5-Action Levels and Actions to be Taken Gross beta activity exceeding 1 E-7 pCi/ml will require the following actions:
1.
Increase the well sampling interval.
2.
Prepare and implement a plant to determine the source of the a ctivi ty. This may include the taking of soil core samples, installation of additional wells, and isotopic analysis of the samples.
3.
Submission of the report to NRC Region II.
13.4.6 Records Records of well sampling and analyses shall be retained at the NNFD-RL until the NRC authorizes their disposition.
These records shall include the dates when the samples were taken, sample analysis O
results, each instance that the action level was exceeded, the actions taken in response to the exceeded level, any changes made to the system, and all reports made to the NRC.
9 License No SNM 778 Docket No.70-824 Date April 1988 0
10 13-5 Amendment No.
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