ML20245C085
| ML20245C085 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 06/19/1989 |
| From: | Hood D Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| References | |
| TAC-68220, TAC-68221, NUDOCS 8906260055 | |
| Download: ML20245C085 (4) | |
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UNITED STATES '
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' NUCLEAR REGULATORY COMMISSION o
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WASHINGTON, D. C. 20555 "
I June 19,'.1989
- Docket Nos. 50-369-and 50-370 1
Mr. H. B. Tucker,' Vice President 4
! Nuclear Production Department p
Duke. Power Company L
422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Tucker:
J
SUBJECT:
CESIUM RELEASES TO THE CATAWBA RIVER - MCGUIRE NUCLEAR STATIO'N, UNITS 1 AND 2 (TACS 68220 AND 68221)
By : letters dated May 10, 1988 and February 21, 1989, you requested a relaxation in the lower limit of detection (LLD) for Cs-137 from 0.1 pCi/L to 50 pCi/L in the discharge of contaminated conventional waste water from the:McGuire Nuclear Station to the Catawba River. Dose calculations were provided in support of your conclusion that liquid releases at the relaxed LLD would meet the radiation dose.
requirements of 10 CFR Part 50, Appendix 1.
. We have reviewed this request with its supporting calculations and have compared these with our own independent calculations. The comparison revert several significant differences.. First, you have made a calculational error (the unwarranted use of dilution of collection basin water.twice) in determining the permissible Cs-137 concentration in the undiluted conventional waste water.
Second, you make no allowance for activities other than Cs-137.. Experience has shown that there will be about as much dcse from Cs-134 as from Cs-137. Third, your LLD calculation does not allow for radioactive releases reaching _the river by way of.the Liquid Radwaste Treatment System discharge to the lake. Finally, for controls to be effective, your LLD must be well-below the average acceptable Cs-137 concentration calculated taking the three factors indicated above into account.
If Cs-137 were the only radioactive nuclide released and the conventional waste water were the only radioactive liquid effluent, we would agree that the permissible Cs-137 concentration in the discharge to the Catawba River would be about 1.0 pCi/L. After allowing fc' (1) proper dilution by collection basin water, (2) discharging effluent to the river less than half the time, (3) the-presence of activities other than Cs-137 (4) releases to Lake Norman from the Liquid Radwaste Treatment System, and (5} a margin between the LLD and the concentration limit, we find that the permissible LLD for Cs-137 at the conven-tional waste water sampling point would be about 1 pCi/L.
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I i 8906260055 890619 7'
PDR ADOCK 05000369 P
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1 Mr. H. B. Tucker Jmie 19, 1989 l
j Based on our calculations which have incluced the above considerations we find it acceptable to increase the LLD for Cs-137 for samples of the conventional waste water from 0.1 pC1/L to 1.0 pCi/L. This relaxation of the LLD is conditioned on the discharge of contaminated waste water no more than half the time and on the dilution of the discharge by collection basin water as indicated in your letter'-
of May 10, 1988.
The staff does not find adequate justification for increasing the LLD to the requested value of 50 pCi/L.
If you have any question regarding this letter, call me at (301) 492-1441.
Sincerely,
D /P Darl Hood, Project Manager Project Directorate II-3 Division of Reactor Projects 1/11 Office of Nuclear Reactor Regulation cc:
See next page 9
C Mr. H. B. Tucker
- Based on our calculations which have included the above considerations, we find it acceptable to increase the LLD for Cs-137 for samples of the conventional waste water from 0.1 pCi/L to 1.0 pCi/L. This relaxation of the LLD is conditioned on the discharge of contaminated waste water no more than half the time and on the dilution of the discharge by collection basin water as indicated in your letter of May 10,1988.
The staff does not find adequate justification for increasing the LLD to the requested value of 50 pCi/L.
If you have any question regarding this letter, call me _ at (301) 492-1441.
Sincerely,
g--
Darl Hood, Project Manager Project Directorate II-3 Division of Reactor Projects 1/11 Office of Nuclear Reactor Regulation cc:
See next page DISTRIBUTION Docket File NRC & Local PDRs PDII-3 Reading S. Varga, 14/E/4 G. Lainas, 14/H/3 D. Matthews M. Rood D. Hood S. Kirslis OGC (for info. only)
E. Jordan, 3302 MNBB B. Grimes, 9/A/2 ACRS (10)
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Mr.-A.V. Carr, Esq.
Dr. John M.1Barry Duke Power Company Department of Environmental Health
. P. O. Box 33189 Mecklenburg County'
?c 422 South Church' Street 1200 Blythe Boulevard
. Charlotte, North. Carolina 28242 Charlotte,l North Carolina 28203
. County Manager of Mecklenburg County Mr. Dayne H. Brown, Chief 4
720 East Fourth Street Radiation Protection Branch Charlotte, North Carolina 28202
~ Division of. Facility Services Department of Human Resources 701 Barbour Driv'e
- Mr. J. S. Warren Raleigh, North Carolina' 27603-2008 Duke Power Company-Nuclear Production Department Mr. Alan R. Herdt, Chief P. 0. Box-33189 Project Branch #3 Charlotte, North Carolina 28242 U.S. Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 t J. Michael McGarry, III, Esq.
Atlanta, Georgia 30323 Bishop, Cook, Purcell and Reynolds 1400 L. Street, N.W.
Ms. Karen E. Long
. Washington, D. C.. 20005-Assistant Attorney. General N. C. Department of Justice Senior Resident Inspector P.O. Box 629
'c/o U.S. Nuclear Regulatory Commission Raleigh, North Carolina 27602 Route 4. Box 529 Hunterville, Nerth Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Ms. S. S. Kilborn Area Manager, Mid-South Area ESSD Projects Westinghouse Electric Corporation MNC West Tower - Bay 239 P. O. Box 355 Pittsburgh, Pennsylvania 15230 l-m____2
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