ML20043B570

Forwards Description of Several Items Associated W/Facility Wastewater Treatment Sys Previously Not Mentioned in NPDES Permit Application

ML20043B570
Person / Time
Site:	Catawba
Issue date:	05/22/1990
From:	Haller W DUKE POWER CO.
To:	Weatherup N SOUTH CAROLINA, STATE OF
References
NUDOCS 9005300234
Download: ML20043B570 (5)

Text

I , 11 l Duke h>urr temnny H<; B t. o.

PO Box 1119A i n s twa ::

Chathne. N C NC  % !. /> .

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DUKE POWER May 22, 1990 1

Ms. Nancy Weetherup 3ndustrial & Agricultural Wastewater Division Bureau of Water pollution Control

[ South Carolina Department of Euclth ' .

I Lnvirotunental Control (CHEC) 2600 Bull Street Columbia, SC 29201 l Sabject: Catawba Nuclear Statica Renewal of NPDBS Permit SC0004278 File: CH-702.13

Dear Ms. Weatherup:

The Catawba Nuclear Station NPDES permit renewal application was submitted to DHEC on November 8, 1988. Per your request, additional information on this topic was sent to you on November 7, 1989. Since that time, several items associated with the Catawba haclear Station wastewater treatment systems that were previously not mentioned in the NPDES permit application have been identified. Attached is a description of these items and a correction for an error found in the NPDES permit application.

If there are any questions about this letter, please contact J. S. Carter

((704) 373-23101 or M. C. Griggs [(704) 373-7080).

Sincerely, ,

Lk 1. CC W. A. Haller, Manager Nuclear Technical Services ARN\ des:0878 Attachment xc: NRC Document Control Desk 9005300234 900522 9 PDR ADOCK 05000413 P FDC dj

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.: Attachment May 22, 1990, 4 Page-1 of 3 The following;is a correction for an error found in the NPDES permit renewal application and items associated with the Catawba Nuclear Station wastewater-treatment systems not previously mentioned in the NPDES permit application:

A. Outfall 001

1. A potential chemical discharge pathway to the Standby Nuclear Service-Water Pond exists. A chemical, Clamtrol CT-1, will be added to the Nuclear Service Water System up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> per day. Normally the Nuclear Service Water System discharges from outfall 001.

Clamtrol CT-1 is approved for discharge from outfall 001 as long as its chemical concentration does not to exceed 1.2 ra/1 at Outfall 001.- If an inadvertent electrical signal is rocerzed from certain instruments, CT-1 treated water that normally discharges from outfall 001 will be discharged to the Standby Nuclear Service' Water Pond. The chemical concentration being discharged to the Standby Nuclear Service Water Pond should be relatively low and the discharge of Clamtrol CT-1 to the Nuclear Service Water Pond would be terminated within 15 minutes. The possibility of these instruments swapping the Nuclear Service Water System discharge to the Standby Nuclear Service. Water Pond is highly unlikely.

2. Small closud systems (i.e.: heat exchangers) may leak small quantities of a Sodium Nitrite / Sodium Tetraborate /Benzotriazole corrosion inhibitor into the Nuclear Service Water System and then this water is discharged from outfall 001. Heat exchanger leakage is periodically nonitored immediately downstream of the heat ex"v.nger. Small amounts of corrosion inhibitor leakage have been de: >ated, however it has been observed only in the. small volume flowing past the heat exchanger. The chemical leakage is not

-detectable'after it has mixed with other sourcos of Nuclear Service water and is also not detectable at outfall 001.

B. Outfall 002

1. Wastewater can be discharged from outfall 002 through the Conventional Waste (WC) system either via gravity or by being pumped. The gravity drain can occur from either the Final Holdup Pond or one of the Settling Basins at a rate of 900 gpm. Pumped flow discharge rates from the Settling Basins can reach 1500 gpm.

The 1500 gpm pumped discharge flow plus the 900 gpm gravity drain results in a total system discharge capacity of 2400 gpm. Please note that the pumped discharge can only occur from the Settling Basins and not from the Final Holdup Pond.

2. Boric acid is now used as a method of reducing caustic stress corrosion in the Unit 1 Steam Generators and might be used in the Unit 2 Steam Generators. Leakage from the Steam Generators and Condensate /Feedwater system goes to the Conventional Waste system and will be discharged from outfall 002.

r L'

-* Atttchment

, M;y 22, 1990

'! Page 2 of 3-C.= outfall 003

1. A Sodium Nitrite / Sodium Tetraborate /Benzotriazole corrosion inhibitor is used in the Training Facility closed cooling system.

Leakage and sampling could send some corrosion inhibitor into the sanitary waste system and be discharged from outfall 003. The small amount of corrosion inhibitor drained to the sanitary waste treatment system will not significantly affect either the waste stream's chemical characteristics or the operation of the sanitary waste treatment system.

D. Outfall 004

1. Previously the maximum discharge rate for outfall 004, the radweste-system, was reported to be 250 gpm. Radwaste discharges may be made olther separately or concurrently from two different tanks. If wastewater is being discharged from a Waste or Recycle Monitor Tank, the maximum discharge flow rate is 100 gpm. If wastewater is being discharged from an Auxiliary Monitor Tank, the maximum discharge flow rate is 250 gpm. If both tanks are discharging at their l maximum rates, the total discharge flow rate from the radwaste 1 system will be 350 gpm. So far, radwaste releases have not been '

performed from two tanks simultaneously.

2. The maximum boron concentration that could be discharged from the liquid radwaste system through Outfall 004 was incorrectly stated in the NPDES permit application. The maximum boron concentration that  !

l could exist at this location is 2000 ppm, not 200 ppm.

3. The " Maximum Daily Value" amounts specified in the NPDES permit application for Outfall 004 were based upon one sample. The numbers for Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) l reported in the NPDES permit application for Outfall 004 approximate .!

the normally seen values at this location. More realistic maximum j 1

Outfall 004 BOD and COD values are as follows:

BOD 250 mg/l COD 450 mg/l  ;

1 Small quantities of wastewater discharged from outfall 004 could l have slightly higher BOD and COD values than the maximum values just  :

I given.

4. Outfall 004's ethylene glycol concentration, prior to mixing with {

NucJear Service Water or Low Pressure Service Water, may reach 200 ppm at times.

E. Other 4

1. If a steam generator has a tub.e leak, water in the Turbine Building Sump could become radioactively contaminated, becoming radwaste.

This radwaste in the Turbine Building Sump could either be processed in the radwaste system or through a separate series of filters and demineralizers. If water is entering the Turbine Building Sump at a

M G

. AttIchment rs . ' M:y 22, 1990 I '

Page 3 of 3 faster rate.than the radwaste system could handle it, it could be

. treated in the separate series of filters and/or demineralizers.

Water pumped through this separate series of filters and/or demineralizers would then be continuously fed into the Low Pressure Service Water System and discharged from outfall 001. This method-of treatment has never been necessary, but the equipment is in place,-should it ever be required.

The purpose of the series of. filters and/or demineralizers is to remove the radioactive . isotopes from the radwaste. Incidental chemical treatment may occur to the radwaste while treating the radwaste for radioactive parameters, i

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