ML17223A827

Forwards Ma Smith 900601 Ltr to WR Cunningham of EPA Requesting Mod to Plant NPDES Permit to Permit Cleaning of Facility & to Establish Discharge Limits for Chemical Cleaning Wastes

ML17223A827
Person / Time
Site:	Saint Lucie
Issue date:	06/18/1990
From:	Sager D FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-90-213, NUDOCS 9006260374
Download: ML17223A827 (38)

Text

... ACCELERATED TRIBUTION DEMONS TION SYSTEM REGULATORY INFORMATION DXSTRIBUTXON SYSTEM (RXDS)

ACCESSION NBR:9006260374 DOC.DATE: 90/06/18 NOTARIZED: NO DOCKET FACXL:50-335 St. Lucie Plant, Unit 1, Florida Power 6 Light Co. 05000335 50-389 St. Lucie Plant, Unit 2, Florida Power 6 Light Co. 05000389 AUTH. NAME AUTHOR AFFXLIATION SAGER,D.A. Florida Power 6 Light Co.

RECXP.NAME RECIPIENT AFFILIATION R Document Control Branch (Document Control Desk)

SUBJECT:

Forwards MA Smith 900601 ltr requesting mod to plant NPDES permit.

to WR Cunningham of EPA D

DISTRIBUTION CODE: COOID COPIES RECEIVED:LTR ENCL ( SIZE: $ 0 TITLE: Licensing Submittal: Environmental Rept mdt 6 R lated Correspondence NOTES RECIPXENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 3 3 PD2-2 PD 1 1 D NORRIS,J 1 1 D

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D NOTE TO ALL "RIDS" RECIPIENTS:

S PLEASE HELP US TO REDUCE WASTE! CONTACI'HE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 22 ENCL 20

P.O. Box [4000, Juno Beach, FL 33408-0420 JUN >~ e~o L-90-213 10 CFR 50.36b U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washingt'on, D. C. 20555 Gentlemen:

Re: St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 NPDES Permit Modification In accordance'ith Section 3.2.4 of the St. Lucie Units 1 and 2 Environmental Protection Plans, attached for your information is a copy of a letter to the U. S. Environmental Protection Agency recpxesting a modification to the St. Lucie Plant NPDES permit. The specific modification is discussed in the attached document.

Very truly yours, D. A. er Vice r sident St. Lucie Plant DAS/DMB/gp Attachment cc: Stewart D. Ebneter, Regional Administrator, Region Senior Resident Inspector, USNRC, St. Lucie Plant II, USNRC 9006260374 9006i8 PDR ADOCK 05000335 PDC P>or an FPL Group company '[i

P. x 078768, West Palm Beach, FL 33407-0768 6001 Village Blvd.

FPL CERTIFIED MAIL RETURN-RECEIPT-REQUESTED June 1, 1990 Mr. W. Ray Cunningham, Director Water Management Division Region IV U.S. Environmental Protection Agency 345 Courtland Street, NE Atlanta, GA 30365 RE: Request for Permit Modification NPDES Permit No. FL0002208 St. Lucie Power Plant

Dear Mr. Cunningham:

Florida Power 8t Light Company (FPL) hereby requests a modification to the above referenced NPDES permit. FPL is requesting a modification to the NPDES permit to enable us to perform steam generator chemical cleaning at the St. Lucie Plant.

Specifically, FPL is seeking the Agency's approval for the following:

~ The establishment of discharge limits for the chemical cleaning wastes.

~ The designation of a new (temporary) point of discharge for metal cleaning wastes.

~ The designation of serial 005, steam generator blowdown, as a source of metal cleaning wastes during the chemical cleaning.

The number of St. Lucie Unit No. 1 steam generator tubes that have had to be plugged due to corrosion has increased significantly since 1984. The corrosion process is related to contaminants which have become entrapped within metallic oxide (iron and copper) deposits in isolated areas of the steam generators. FPL has determined that the best way to reduce the corrosion is to remove the contaminants along with the metallic oxides using a chemical cleaning process. This has prompter'PL to plan for a chemical cleaning of the St. Lucie Unit No. 1 steam generators at the next scheduled refueling outage in the fall of 1991.

The process FPL plans to apply is one that the Electric Power Research Institute-Steam Generator Owners Group (EPRI-SGOG) developed which will be adapted for application at the St. Lucie Plant. The EPRI-SGOG chemical cleaning process is shown in attachment 1. This process has been successfully used by other utilities to clean an FPL Group company

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their steam generators.

The chemical cleaning process involves separate cleaning steps to remove the copper and iron oxides. Rinses are also performed between the iron and copper steps. At St.

Lucie Unit No. 1 two steam generators (approximate volume of 3340 cu-ft each) would be cleaned. It should be noted that FPL willbe cleaning the secondary side of the steam generators not the primary (reactor water) side. However, there is a potential for a small amount of radioactive material to be present in the cleaning wastes. All treatment and or disposal of any radioactive material associated with the chemical cleaning will be performed in accordance with all applicable federal and state regulations and with the plant's technical specifications issued by the Nuclear Regulatory Commission (NRC).

Since this chemical cleaning was not anticipated during the renewal of the St. Lucie NPDES permit, appropriate limits for effluent waste streams associated with the chemical cleaning process have not yet been established. However, in order to perform the chemical cleaning, FPL is requesting that discharge limits be established, To assist the EPA establish effluent limits for the chemical cleaning process, FPL has undertaken toxicity studies for EDTA (the primary constituent of the chemical cleaning solvents) and for the spent iron and copper solutions. A report summarizing the EDTA study results, along with our interpretation of these results and suggested limits is included herein for the Agency's review.

The initial test results obtained with the spent iron and copper solutions were not definitive. Therefore, FPL is conducting further testing for use as a basis for establishing discharge limits for EDTA complexes including iron and copper. The EDTA complexes should not be biologically available to aquatic organisms. The FPL tests will verify that there will be no significant toxicity in the receiving waters, This information will be provided to the Agency upon completion of the tests. The discharge for uncomplexed iron and copper would remain the same (1 mg/L) as in the current NPDES permit. In addition, the discharge of hydrazine (a constituent in the iron solvent) would be limited to an average resulting concentration of 0.6 mg/L at the headwall consistent with our correspondence of December 2, 1988. This will be the first steam generator cleaning to be performed at the St. Lucie Power Plant.

We anticipate that these cleanings would occur very infrequently, and would be performed only during scheduled outages.

FPL is seeking final agency action on this request by September 1990. The need for this information is to support the process application selection. FPL will need to have this approval in order to provide specifications for the chemical cleaning process and vendors bidding on the process will need to know this information in order to design and engineer their systems.

Please feel free to contact Winifred Perkins of my staff at (407) 640-2023 if you have any questions or comments concerning this request.

Sincerely, Martin A. Smith, Ph.D.

Manager Environmental Permitting 5 Programs Florida Power 8c Light Company MAS/WGP/jlf Enclosure cc: Charles Kaplan - EPA William Peltier - EPA - Athens Vik Kamath - DER - WPB

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Attachment I EPRI SGOG CLEANING PROCESS SGOG Iron Solvent-EDTA 10% by weight Hydrazine 1% by volume CCI-801 (base metal inhibitor) .75% by volume pH 7.0 with ammonia SGOG Co er Solvent-EDTA 5% by weight pH 7.0 with ammonia pH 9.5 with EDA Hydrogen Peroxide 3% by volume

PSL STEAM GENERATOR CHHCICAL CLEANING WASTES:

RECOMMIWlDED DISCHARGE LIMITS Environmental Afhhs Department May 1990

TABLE OF CONTENTS Section ~Pa e Table of Contents I. Background II. EDTA III. References IV. Appendix

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s L ~Back ound The Environmental Affairs Department was asked to evaluate wastes that would be generated from the proposed chemical cleaning protocol for the PSL Steam Generators from the standpoint of defining allowable discharge limits where NPDES steam electric guidelines have not been established. To this end, toxicity tests were conducted by Hunter/ESE of Gainesville, Florida on a 10/0 EDTA solution prepared by Combustion Engineering, Inc. of Windsor Connecticut.

Summary data from the Hunter/ESE report are appended to this report.

This report develops recommendations to establish effluent limits at the point of discharge for concentrations of free EDTA from the steam generator chemical cleaning process, under different flow conditions of both the point discharge and the total throughput of the plant in the discharge canal.

The toxicity tests were conducted using two salt water species, the mysid shrimp (MMsido sis b~ahia and the sheepshead minnow (CCrfnodon v~arie atua . The tests followed standard EPA protocols (Peltier and Weber, 1985) for developing 96-hour LC>os, or the percent effluent concentration that is lethal to 50% of the organisms within a 96-hour exposure period. Using this toxicological endpoint for the most sensitive of the two species, toxicity-based discharge limits were developed for EDTA from the procedure given in Section 12 of the EPA guidance document (Peltier and Weber, 1985).

Control survival and water quality parameters were all within acceptable limits for concentration ranges from which the LC Os were calculated except for unexplained pH shifts in certain test concentrations. Although tfte lowered pH may have contributed to observed toxicity, the data are acceptable for development of allowable discharge limits since any effect the pH shifts may have had would only contribute to the conservatism of the recommended limits.

The recommended concentration limits for EDTA in the St. Lucie steam generator chemical cleaning discharge are developed below.

II. Eth lenediamine Tetraacetic Acid EDTA The 96-hr. LC50 for a 10% solution of EDTA (hypothetical effluent) for the most sensitive species (MMsido sis ~bahia of the two species tested is 0.2% effluent.

Converting to amount EDTA per liter of effluent:

0.2% of 10% EDTA solution 0.002 x 100 g EDTA/I = 0.2 g/l.

To protect receiving waters where a mixing zone is specified, it is necessary to assure that there will be no acutely lethal condition within the boundary of the mixing zone. In the case of the PSL effluent, the discharge canal is analogous to a mixing zone prior to the final ocean discharge.

In accordance with EPA guidance (Peltier and Weber, 1985), a factor of three is applied to the acute LC50 to define the instream waste concentration (IWC) protective against acutely toxic concentrations of an effluent constituent.

Thus:

IWC < ~LC 3

s or, for EDTA, IWC < 0.2~

3 0.067 g/L This calculated IWC agrees very well with the no-observed-adverse-effect-concentration (NOAEC) determined in the ~Ms(do sis toxicity test (0.056 g/O.

At the St. Lucie plant site, the point at which the IWC must not exceed 0.067 g EDTA/I is in the discharge canal after convergence at the NPDES compliance point east of A1A. It is also required that the waste should not exhibit acute or chronic toxicity outside of the discharge canal. It is clear that the recommended IWC will be adequate to protect against acute and chronic toxicity beyond the ocean discharge because of (1) the very high dilution factor, and (2), although relatively persistent in surface waters, EDTA is not expected to bioaccumulate in aquatic organisms (NLM, 1990),

The allowable concentration of EDTA in the discharge from the St. Lucie steam generator chemical cleaning process is calculated by:

Ce=R xC Re

where, C~ = maximum allowable concentration of EDTA in the steam generator chemical cleaning discharge, R~ = discharge rate of release, CC maximum allowable concentration of EDTA in the canal (0.067 g/1),

RC rate of flow in the canal.

This equation has numerous solutions, however, since the discharge flow from the steam generator chemical cleaning process can vary from one to 100 gallons per minute (GPM), and the total system flow can vary from 29,000 GPM to 1,026,000 GPM (although actual flows rarely would exceed 50 GPM for the discharge and 500,000 GPM for the total system). For easy reference, a graph has been generated in Figure 1 that relates the ratio of the rate of flow in the canal, or total system flow, to the rate of discharge from the steam generator chemical cleaning process (Rgb, presented on the ordinate) to the calculated allowable EDTA concentration in the steam generator chemical cleaning process discharge (C<, presented on the abscissa).

Thus, one needs only to determine the ratio of current total system to discharge flows, locate this value on the ordinate, come horizontally to the point of intersection with the graph and then vertically to the abscissa to read the corresponding value for the allowable EDTA discharge concentration. Potential vendors should be apprised that the total unreacted EDTA in the treated discharge should not exceed the amount indicated for any given set of flow conditions.

It should be noted that complexing reduces the toxicity of EDTA. Because EDTA wiQ complex with calcium and magnesium (relatively non-toxic metals that contribute to hardness and salinity of receiving waters), the concentration of EDTA tolerated by organisms increases directly with both water hardness and salinity (Mount and Anderson-Carnahan, 1988). The receiving water at the St. Lucie Plant has an average salinity of 35.4 ppt., with annual and monthly means varying less than 1 ppt.

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III. References Mount, D. 1. and L. Anderson-Carnahan. 1988.

Methods for Aquatic Toxicity Identification Evaluations, Phase I Toxicity Characterization Procedures. EPA/600/3-88/034. Environmental Research Laboratory, USEPA, Duluth, Minnesota.

National Library of Medicine. 1990. MEDLARS on-line network, Hazardous Substances Data Bank (HSDB). NLM, U.S. Dept.

Health and Human Services, Bethesda, Maryland, Peltier, W. H. and C. I Weber, eds. 1985.

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Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine Organisms, Third Edition. EPA/600/

4-85/013. Environmental Monitoring and Support Laboratory, USEPA, Cincinnati, Ohio.

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I IV. APPENDIX Summary data from 96-hour acute toxicity tests of a hypothetical EDTA effluent on the mysid shrimp, ~Msido sis bahia and the sheepshead minnow, ~Crinodon v~rarie ates.

C-EAT.11/FPL-EFF.8 01/08/90 3.0 INSULTS AND DISCUSSION 3.1 EDTA SOLUTION After 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> of exposure, mysid survivial ranged from 0 to 100 percent in all low concentration range treatments. Mysid survival in all high concentration range treatments was 0 percent in less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Control survival for exposed mysids was 95 percent for both concentration ranges (Table 3-1). The 96-hour LC50 for the EDTA Solution effluent sample to mysids was 0.20 percent effluent with 95 percent confidence limits of 0.18 and 0.32 percent effluent. With the exception of extremely high salinities in the hi concentration range osures, water quality parameters retn'iined within

,acceptable limits throughout the tests. Mysid survival and water quality data are provided in Appendix C.

After 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> of exposure, sheepshead minnow survival ranged from 90 to 100 percent in all low concentration range treatments. Sheepshead minnow survival in all high concentration range treatments was 0 percent in less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Control survival for exposed sheepshead minnows was 100 percent for both concentration ranges (Table 3-1). The 96-hour LCSO for the EDTA Solution effluent sample to sheepshead minnows was 1.96 percent effluent with 95 percent confidence limits of 1.0 and 5.6 percent effluent.

With the exception of low pH in the 1.0 percent concentration of the low concentration range test, and the extremely high salinities in the high concentration range exposures, water quality parameters remained within 3-1

l:-EAT.11/FPL-EFF.9 Ol/08/90 acceptable limits throughout the tests. Sheepshead minnow survival and water quality data are provided in Appendix D.

C-EAT.11/FPLEFF-H.1 Ol/04/90 Table 3-1. Survival of Mysids ~Msidoissis ~bahia and Sheepshead Minnows (CCrenodon a~erie grus During 96 Hour Exposures ro Two Concentration Ranges of EDTh Solution ENuent Percent Survival Concentration Ran e w Concentration Ran e ~Hi h Sheepshead Percent ids Shee shead Minnows Percent ~Mid s Minnows Mixture 24 Hour 48 Hours 72 Hours 96 Hours 24 Hour 48 Hours 72 Hours 96 Hours Mixture 24 Hours 24 Hours Control 100 95 Control 95 0.056 100 5.6 0 0.1 10 0.18 95 55 100 100 18 0.32 70 25 100 100 32 0.56 10 10 100 100 56 1.0 95 90 90

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