ML20248K590

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Forwards Info Requested Re Groundwater Monitoring Sys for Liquid Waste Disposal Facility Tanks
ML20248K590
Person / Time
Site: 07000824
Issue date: 03/31/1989
From: Christopher Boyd
BABCOCK & WILCOX CO.
To: Rouse L
NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
25399, NUDOCS 8904170383
Download: ML20248K590 (11)
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. Babcock & Wilcox NNFD RESEARcH LABORATORY -

a McDermott company P.O. Box 11165 Lynchburg, VA 24506 1165 j

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ATTN: ' Leland C. Rouse, Chief Fuel Cycle Safety Branch Division of Industrial & Medical Nuclear Safety Washington, D.C. 20555

Reference:

Letter from A. F. Olsen to L. C. Rouse, dated 04/27/88.

Gentlemen:

The Babcock & Wilcox Company, Naval Nuclear Fuel Division Research Laboratory (NNFD-RL), is providing the information requested concerning our groundwater monitoring system for our Liquid Waste Disposal Facility (LWDF) tanks.

Attached are changes to our license, SNM-778, which answer the questions posed during a telephone conversation between - A. F. Olsen (NNFD-RL) and Sean Soong (NRC-Licensing) on January 17,_1989.

These changes are being made to information which was originally submitted in the above reference.

Changes from the reference submittal are indicated by vertical lines in the right hand margin.

.I Hopefully, this information is sufficient to close the remaining con-l cerns surrounding the NNFD-RL groundwater monitoring program.

If you should have any further questions, please contact me at (804) 522-5753.

Very truly yours, BABC0CK & WILC0X NNFD Research Laboratory I

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l Charlie C. Boyd, Jr.

License Administrator l-jhc l

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. -.A INSTRUCTION SHEET

- BAW-381 DEMONSTRATION AND CONDITIONS FOR LICENSE SNM-778 REVISION 10 AMENDMENT.O TAKE OUT PAGES PUT IN PAGES Page Rev.

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q 5-4' 9

3/88 5 10 3/89 5-5 10 3/89 13-3 8

11/87 13-3 10 3/89 13-4 4

4/87 13-4 10 3/89 1

13-5 10 3/89 13-6 10

.3/89 13-7 10 3/89 13-8 10 3/89 O-O 1

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Direct radiation monitoring at the site boundary -

continuously.

9.

Accumulated water from the soil retention basin shall be sampled 1

annually and if its activity exceeds 10% of the concentration '

specified in Appendix B, Table 2, Column 2, 'of 10 CFR 20, the d

collected water shall be disposed of through the liquid waste disposal system.

10. Accumulated water from the Temporary $toraga 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-a tamination is found, Sub-sections 7.2.3.8 and 7.4.1 of this application shall be amendad to incorporate the decommissioning of the Temporary Storage Facility.

1 5.2.3 The evaluation of environmental sampling shall be performed by either the site personnel or a qualified outside concern.

5.3 GROUNDWATER MONITORING 5.3.1-Monitoring System

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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 (from historical sampling of the tanks prior to discharge) in the waste water that is collected in the LWDF.

5.3.2 Sampling Each well shall be sampled on 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 spring.

5. 3. T, Analysis Each well water sample shall be analyzed for gross beta-gamma activi ty.

Samples may be analyzed for alpha activity if warranted by storage tank sample results.

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License No SNM 778 Docket No.70-824 Date l

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Amendment No.

Revision No.

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5.3.4 Action Levels and Actions to be Taken Gross beta-gamma activity exceeding 30 pCi/L shall require the l

I following actions:

1.

Prepare and implement a plan to determine the source of the activity, to include checking for alpha activity if warranted.

l 2.

Submit a report to the NRC Region II Office in the event that the investigation shows leakage in the tanks.

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.

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l License No SNM 778 Docket No.70-824 Date March,1989 Amendment No.

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-13.4 GROUNDWATER MONITORING 13.4.1 Monitoring System j

l The ground'ater monitoring system is installed in compliance with w

i Condition No.13, License SNM-778, as renewed on July 30, 1987. The i

l purpose of the monitoring system is to monitor the groundwater under.

the Liquid Waste Disposal Facility (LWDF) for radioactivity that may 1

be released as a result of tank leakage. There are seven wells l

roughly evenly positioned around the LWDF.

The wells are drilled to depths that permit the sampling of the groundwater at the interface I

of the soil and bedrock. The depths of the wells are shown in Table l

13-1.

TABLE 13-1 NNFD-RL MONITOR WELL CONSTRUCTION DETAILS 1

1 Bottom Top g

of of Total Well No.2 Screen Screen Depth 1

63 43 65 g

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46 31 52 3

57 37 60 4

48 33 50 5

60 40 104 6

81.2 61.2 85 l

7 72 57 72 f0epthbelowgradeinfeet.

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 i

the introduction of any contaminants or substances from the drilling mud. The screens are set inside a temporary casing and a sorted License No SNM 778 Docket No.70-824 Date March,1989 Amendment No.

Revision No.

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sand filter pack placed around the well screens. Above the well j

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.

The groundwater monitoring system is designed to provide an early warning of a leak, should one occur, from any of the tanks or piping located at the LWDF. To erisure this, the wells are roughly equally spaced around the perimeter of the LWDF and associated underground storage tanks.

Groundwater flow is to the west. Wells MW-RLO6 and MW-RLO7 are located to the west and hydrologically downgradient of the tanks.

The depth of the wells (close to the bedrock interface) were based on the following:

Flow in the aquifer is primarily through fractures in the bedrock.

The water table is near but not limited to the bedrock / alluvial sediment interface.

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No evidence was found of impermeable layers capable of forming perched water tables.

The monitoring wells were installed in general accord with EPA's

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RCRA Ground-Water Technical Enforcement Guidance Document (September i

1986).

The initial analysis results from the November,1987 samples (only five wells) are presented in Table 13-2:

TABLE 13-2 WELL SAMPLE ANALYSIS FOR NOVEMBER, 1987 i

i Well #1 2.12 E-9 pCi/ml Well #2 2.03 E-9 pCi/ml Well #3 2.72 E-9 pCi/ml Well #4 1.34 E-9 pCi/ml Well #5 No Water l

License No SNM 778 Docket No. 70824 Date March, 1989 0

10 13-4 o

Amendment No.

Revision No.

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Babcock &Wilcox a McDermott company

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1 13.4.3 Sampling Each of the wells will be sampled on a quarterly basis for two years, l

beginning in November, 1987.

Af ter this period, if no. action level l

is exceeded, the sampling interval will be once each year, in the winter or spring.

j 13.4.4 Analysis Each well sample will be analyzed for gross beta-gamma activity to detect the presence of Cesium-137 and Cobalt-60, the principle isotopes present in the liquid waste system.

Currently there is no reason to suspect that alpha activity would be present in the groundwater since appreciable levels are not being detected during the sampling of the storage tanks.

If significant alpha activity is detected during the sampling of the storage tanks, then a decision will be made to sample the wells for alpha activity l

as well as for beta-gamma.

l 13.4.5 Action levels and Actions to be Taken Gross beta gamma activity exceeding 30 pCi/L will require the l

i following actions:

1.

Prepare and implement a plant to determine the source of the f

ac tivity. This my include the taking of soil core samples, installation of additional wells, checking for alpha activity, l

and isotopic analysis of the samples.

2.

Submission of the report to NRC Region II in the event that the investigation of the elevated levels shows leakage in the tanks.

13.4.6 Records Records of well sampling and analyses shall be retained at the NNFO-i RL until the NRC authorizes their disposition. These records shall include the dates when the samples were taken, sample analysis results, each instance that the action level was exceeded, the

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actions taken in response to the exceeded level, any changes made to the system, and all reports mde to the NRC.

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