ML20235F061
| ML20235F061 | |
| Person / Time | |
|---|---|
| Site: | Wood River Junction |
| Issue date: | 06/12/1987 |
| From: | Helgeson K UNITED NUCLEAR CORP. (SUBS. OF UNC, INC.) |
| To: | Shum E NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 28313, NISRI:87-013, NISRI:87-13, NUDOCS 8707130192 | |
| Download: ML20235F061 (5) | |
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A Subsidiary of United Nuclear Corporation One Narragansett Trail. RFD #1 Telephone 401/364 7701
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A UNC incorporated Cornpany Charlestown. Rhode islana 02813 NISRI: 87-013 June 12, 1987 0
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Gentlemen:
In response to the request contained in your letter dated May.12, 1987, I am herewith submitting the re-quested clarifying information in an attachment to this letter.
If there are any further questions concerning this matter, please contact the writer or Mr.
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R.
Velasquez at your earliest convenience.
Sincerely, UNC Recovery Systems m
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a Attachment to NISRI: 87-013, dated June 12, 1987 Page 1 l
1 In this attachement, I will respond to your questions nos.
1 through 5, in secuence.
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- 1 UNC Recovery Systems requested the deletion of 17 wells from the sampling requirements.
The identifying numbers for the wells contained in our request are as follows:
W-B W-5 W-10 T-5 77-D W-C W-6 T-1 T-6 W-D W-7 T-2 T-8 W-E W-8A T-3 T-9 O.
- 1 The wells which have been out-of-service for a period greater than one year are: Wells W-A, W-11, and PW-1. Cie explanation for these wells being out-of-service is as follows.
Wells W-A and F-11 These two wells have been out of service since before May 10, 1984, the date upon which our license was revised in its entirety by NRC. A request for an amendment to our license, allowing UNC Recovery Systems relief from the requirement to replace any well which could not be sampled or was out-of-service for other reasons, for a period greater than one year, was submitted to the USNRC. Approval of this request was issued as Amendment number 21, dated 9/7/82. As such, these wells were not replaced. Please note that they are not in Table 407.2-II of our license.
Well PW-1 This well was the main water supply well for the active facility.
While the water from this well was being utilized in the active
- facility, it was sampled and analyzed in accordance with our license requirements. When the facility water supply system was removed from service and physically disconnected from the supply line, all use and sampling of this well was discontinued as it became unavailable for sampling. We would point out, however, that there are other test wells (i.e. wells T-1 and W-5) in the vicinity of PW-1 that are sampled and analyzed which provide data from the same portion of the aquifer as that of PW-1.
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l Attachment to NISRI: 87-013, dated June 12, 1987 Page 2 O.
- 3 The wells identified in the revised Section 400, Table 407.2-II, submitted on 1/30/87, are the wells that UNC Recovery Systems proposes to continue sampling.
UNC proposed the sampling frequency to be monthly, as the current sampling plan requires.
- However, quarterly sampling as NRC suggested in our. recent telephone conversation would provide adequate information. The parameters we propose to be analyzed for are as follows; pH, Specific Conductivity,-and Temperature would be taken at time of sampling. Gross Alpha and Gross Beta analysis would be used as a screening technique. U-234, U-235, U-238, Ra-226, Ra-228, Th-228, Th-230, Th-232, Sr-90, Cs-137 and Gamma Spectrometry would be analyzed for in the event that a sample exceeded 15 pCi/L of alpha producing isotopes or 50 pCi/L of beta producing isotopes in our sample screening analyses. This is consistant with ' the analyscs we presently conduct. However, please note that we have requested relief from the requirement to analyse for fluorides and nitrates.
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- 4 Sketch 407.2-I contained in our License provides the general location of the DH wells. The wells were drilled into bedrock and are between 150 and 200 feet deep. They were constructed in such a way to allow samples to be taken from various predetermined fixed locations, vertically, within the well.
The individual sample extraction tubes in DH-2 failed over time prior to February, 1984 at which time the well became totally inoperable.
The DH test wells were complex sampling devices voluntarily installed by UNC Recovery Systems to allow a vertical profile of the plume of contamination in the aquifier existing at the time of their installation in 1981, to be plctted. These wells were installed in consultation with USNRC, the USGS, the State of Rhode Island, and UNC's contractor, Goldberg/Zoino. There were, and are, no regulatory requirements for the emplacement, or sampling of these wells. UNC Recovery Systems has voluntarily sampled these wells concurrently with the wells which we monitor a r.
a license requirement.
These wells served their intended purpose. As such, UNC Recovery System will discontinue sampling the DH-1.
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I Attachment to'.NISRI: dated, June 12, 1987 Page 3 1
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- 5 As attachments to our 1/30/87 request for an amendment, UNC Recovery : Systems submitted copies of all our analysis data for each of the seventeen subject wells, extending back a minimum of twenty months. Data for some wells extended back even further than twenty months. As such, our rationale is not based only on a 20-month period as stated in your letter. Rather it is based on a minimum 20-month period as the data base extends beyond 20 months.
Regarding your request for an explanation as to why the other EPA standards on relevant radionuclides, such as Sr-90, Ra-226 or Ra-228 were excluded for comparison, we did not make the comparisons you imply as we believe them to be inappropriate. The interim Drinking Water Standards do not apply to our site and should not be used in evaluating our request to reduce monit6 ring. Further, the data submitted with our proposal demonstrates using gross alpha and gross' beta screening that during the entire sampling period no significant quantities of these radionuclides have been detected in the wells we have proposed for deletion from the monitoring program.
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