ML20138E100
| ML20138E100 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 12/11/1985 |
| From: | Corbin McNeil Public Service Enterprise Group |
| To: | Adensam E Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8512130335 | |
| Download: ML20138E100 (4) | |
Text
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Public Service Electric and Gas Company Carbin A. McNeill, Jr.
Pubhc Service Electnc and Gas Company P.O. Box 236 Hancocks Bndge, NJ 08038 609 339-4800 Vice President.
Nuclear December 11, 1985 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Attention:
Ms. Elinor Adensam, Director Project Directorate 3 Division of BWR Licensing
Dear Ms. Adensam:
CONSTRUCTION PERMIT NO. CPPR-120 CONDITION 3.E.1 HOPE CREEK GENERATING STATION DOCKET NO. 50-354 Condition 3.E.1 of the Hope Creek Generating Station (HCGS)
Construction. Permit states that
...the Applicants shall conduct a study of proposed chlorination methods to assure that the use of these methods will result in acceptable chlorine residuals-in the station effluent..." and " Alternative methods of reducing chlorine residuals shall also be investigated..."
This letter is submitted in fulfillment of that condition.
PSE&G has been conducting ongoing studies of chlorine decay and chlorine minimization at Artificial Island and has investigated alternative methods of reducing chlorine residuals.
These studies, coupled with the fact that PSE&G has chosen an alternative method that completely eliminates any chlorine residual, satisfy Condition 3.E.1 of the Hope Creek Construction Permit.
The ongoing chlorine decay and optimization studies include an evaluation of the effects of variable ammonia and organic nitrogen concentrations, chlorine demand, temperature, and pH on the chlorine residuals in the treated water.
Preliminary results indicate that of the 24 variables analyzed, chlorine demand, intake salinity, and intake pH are the most imoortant factors influencing chlorine decay in the cooling water systems.
Of these variables, chlorine demand is the over-riding factor in modeling chlorine decay.
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Director of Nuclear 2
12-11-85 Reactor Regulation Chlorine optimization studies have also been conducted in response to USNRC IE Bulletin 81-03 to determine what levels of chlorine residual are necessary to prevent bio-fouling of our cooling water systems by common oysters (Crassostrea virginica), barnacles (Balanus improvisus),
ribbed mussels (Modiolus demissus), and other biomass.
Data from these studies indicate that intermittent chlori-nation at the chlorine residuals allowed by our NJPDES discharge permit will not prevent biofouling in cooling water systems at Hope Creek.
After reviewing alternative methods, such as targeted chlorination, blowdown scheduling, and ozone, that may prevent biofouling in the service and circulating water systems at Hope Creek and still meet the residual chlorine limitation, PSE&G chose continuous chlorination followed by dechlorination.
Dechlorination will allow chlorine residuals within the cooling systems to be maintained at a level sufficient to prevent biofouling while completely eliminating chlorine residaal from the effluent.
The NJDEP has accepted this systen. and agrees that further study of chlorination methods is unwarranted (R.
L. Mittl to W.
Butler, 6/6/85).
Other byproducts of dechlorination have been addressed in the NJPDES discharge permit.
PSE&G will be monitoring the cooling water blowdown for a number of parameters, including chemical oxygen demand (COD) and pH.
Table 1 shows the anticipated effect of dechlorination on pH, alkalinity, total dissolved solids (TDS), ammonia as NH3, sulfate as SO4, dissolved oxygen (DO), and chemical oxygen demand (COD) in the blowdown.
These calculations assume minimum, average, and maximum total residual chlorine levels in the blowdown of 0.5, 1.0 and 3.0 ppm; respectively, along with a 20 percent excess of ammonium bisulfate.
As demonstrated by this data, the overall impact of dechlorination on effluent quality is minimal.
o L_____._________
Director of Nuclear 3
12-11-85 Reactor Regulation Should you have any questions in regard, please contact us.
Sincerely, Attachment C
D.H. Wagner USNRC Licensing Project Manager R.W.
Borchardt USNRC Senior Resident Inspector
TABLE 1 HOPE CREEK GENERATING STATION EFFECTS OF DECHLORINATION.ON WATER QUALITY PARAMETER MINIMUM AVERAGE MAXIMUM Total Residual Chlorine 0.5 ppm 1.0 ppm 3.0 ppm (TRC)
CHANGE IN BLOWDOWN CONCENTRATION pH
-0.01.
-0.02
-0.04 Alkalinity
-0.08 ppm
-1,7 ppm
-5.0 ppm Total Dissolved Solids
+0.08 ppm
+1.7 ppm
+5.0 ppm (TDS)
NH3
+0.14 ppm
+0.29 ppm
+0.86 ppm SO4
+0.68 ppm
+1.35 ppm
+4.05 ppm Dissolved Oxygen (DO)1 0.0 0.0 0.0 Chemical Oxygen Demand
+0.023 ppm
+0.046 ppm
+0.14 ppm (COD) 1 Reaction rate of bisulfate with oxygen is comparatively slow at cooling water temperatures and effects on oxygen are better expressed as COD.
2/kasl