ML19354E879

Forwards Application for NPDES Permit for Storm Water Discharge at Plant

ML19354E879
Person / Time
Site:	Catawba
Issue date:	01/25/1990
From:	Tucker H DUKE POWER CO.
To:	Joy J SOUTH CAROLINA, STATE OF
References
NUDOCS 9002020199
Download: ML19354E879 (7)

Text

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DUKE POWEM

@ January 25, 1990  !

t Mr. James A. Joy, III, Chief Bureau of Water Pollution Control Department of Health and Environmental Control '

2600 Bull Street Columbia, SC 29201

Subject:

Catatsba Nuclear Station  !

Storm Water Discharge NPDES permit Application File: CN-702.13 >

Dear Mr. Joy:

The Clean Water Act was amended February.4, 1987. One of the requirements of the amended Act was for applications 'for permits for storm . water discharges to be submitted by February 4, 1990. The regulations governing the content of the applications were to be promulgated by Fcbruary 4, 1989, ,

but have not been promulgated to date.

f While Duke h,wer Company realizes no regulations currently exist and no

• formal application has ' been approved, we do not wish

• to neglect the  !

Con 3ressionally-mandated' deadline. In order - to comply with the statutory  ;

deadline, please find enclosed our application for a discharge permit for the storm water discharge at the Catawba Nuclear Station. The enclosed is our good faith effort application based on the proposed. regulations.  ;

When the storm water application regulations have been promulgated, we will file a complete application, and if required we will-include sampling data, .

within the specified time frame. -

Should you have any questions or dee. c:e additional information, please .

I contact J. S. Carter [(704) 373-2310).  :

i Sincerely, 1

b -

R Mr

[ Hal B. Tucker, Vice President >

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"atewha buclear Station Storm Water NPDES Permit Application Narrative January 24, 1990 INTRODUCTION The Catawba Nuclear Station is a two (2) unit nuc1 car fission- steam electric generating station. ' It ' is owned by Duke Power Company, . North Carolina Electric Membership Corporation, North Carolina Municipal Power Agency Number 1, Piedmont Municipal Power Agency, and the Saluda River Electric Cooperative, Inc. but totally operated by Duke Power Company. Each unit is a four loop pressurized water reactor. Reactor fuel la zircaloy clad sintered uranium oxide pellets. Reactor heat is absorbed by the Reactor Coolant System and produces steam in four (4) steam generators suf ficient to drive a turbine generator unit with a design net electrical rating of 1129 megawatts.

SITE RUNOFF COLLECTION AND TREATMENT Area Description The Catawba Nuclear Station site covers 391 acres. The area associated with the industrial activity and parking lots are paved or hard-packed dirt areas. Other areas (entrance way and outside the industrial area) are landscaped. Yard drain catch basins are strategically spaced throughout the area to intercept runof f. The yard drains follow the natural contour to either the Standby Nuclear Service Water Pond (SNSWP) or Lake Wylie. Yard drains discharge - to Lake Wylie at the service teater intake or the discharge cove.

The SNSWP was constructed by placing a dam across a small cove of Lake Wylie on the intake (Beaver Dam Creek) side of the station. The SNSWP is the source of water sufficient to shutdown the station in the event that the main source of cooiing water is lost that is required by the Nuclear Regulatory Commission (NRC). The influent to the pond is area runoff from a drainage area of 410 acres or pumping water from Lake Wylie to the pond. Discharge f rom the pond is via a 60-inch diameter overflow pipe to Lake Wylie. Overflow is always from the SNSWP to Ltke Wylie.

Collection, Treatment and Discharge As a result of unauthorized discharges of pollutants, a secondary containment system was installed on the power house yard drains in 1986 in compliance with a Consent Order issued to Duke Power Company by the South Carolina Department of Health and Environmental Control (DHEC). The secondary containment system consists of a 10,000-gallon-sump at each of the three (3) discharge locations (discharge cove, station service water intake, and SNSWP). The power house yard drains connect to the sumps via a passive intercept / trap system. Spills and minor volumes from rain storms will flow into the sumps, while significent rainfall flows will still be discharged directly to the -

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SNSWP, intake cove, and discharge cove. A rainf all of approximately 0.016 inches in one (1) hour will fill the sumps.

The accumulated water is pumped f rom the sumps to the Conventional Wastewater Treatment (WC) System - a permitted system and discharge (Discharge 002). The pumps continue to operate until (1) the cump is emptied or (2) an overflow condition results from the rainfall. In the event of a rainf all overflow, the pumps are automatically shut off by u level control switch. The purpose of allowing significant rain water flow to continue to discharge to the SNSWP and Lake Wylie is to' prevent overloading the WC System.

The WC system consists of a concrete initial holdup pond (IHP, 300,000 gallons), two (2) parallel clay-lined settling ponds (5 million gallons each), and a polymer lined final holdup pond (FHP, 1.5 million gallons). Normally, inputs are received in the initial holdup pond but can be directed to the in-service settling pond. The 1HP serves a surgo-dampening function to the settling ponds and also allows heavy solids to settle for periodic removal. Solids removed 'from the 1HP are dewatered and disposed of in the on-site licensed landfill. Flow is directed to the in-service settling pond where chemical treatment, mixing, and aeration take place. Sulfuric acid and sodium hydroxide are added for pH control. Coagulants can also be added to f acilitate the settling of small particles. Additionally, it may be necessary intrequently to oxidize persistent chemicals with chemical oxidants.

The settling ponds can discharge directly to Lake Wylie via Outf all 002, or directed to the FHP for additional treatment or holdup capacity. Treatment in the WC System is on a batch or flow through basis.

Discharge ir normally by gravity at approximately 900 gpm but can be pumped at a rate of 1500 gpm. The discharge rate can be 2400 gpm when one basin is being pumped out and another is discharging by gravity.

Outf all 00? discharges flow f rom the WC System through a Parshall flumo into the Big Allison Creek arm of Lake Wylie.

MATERIALS MANAGEMENT Materials Exposed to the Elements oversized construction items (i.e., steel beams, electric cable) are stored outside. This material is free of any liquids. ' There are no storm drains in the area. The Construction and Maintenance Department.

(CMD) 90-day storage area is in the storage yard. This area is diked and fenced. The base of the area is constructed of Vol-Clay (impervious), clay, a vinyl liner, and dirt with crushed gravel on top. There are no storm drains near the area.

Materials Storage Areas Except for the materials discussed above, materials used at the Catawba Nuclear Station are stored so that they are not exposed to the elements. Solid chemicals are stored in warehouses; liquid chemicals, are stored primarily in drums in the - warehouses - or - in tanks in i

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4 buildings close to the point of use. Lubricants are stored primarily in drums in the warehouses; other petroleum products are stored primarily in underground tanks.

Structural Measures to Reduce Materials in Runoff All loading / unloading docks are equipped with concreto pads / ramps.

Associated with the pads / ramps are drains or sumps for removing rain water. During loading / unloading activities, the valves associated with the drains or sumps are closed to prevent msterial entering the yard.

drain system.

Above ground storage tanks are equipped with secondary containment with sufficient volume to contain the entire contents of the tank.

Non-Structural Measuren to Reduce Materials in Runoff All loading / unloading activities are attended and visual inspections are performed af ter material deliveries. Also routine inspections are scheduled and documented or, the material storage areas, treatment systems, ponds, intake, and discharge points at a frequency that should detect any problems. Non-routine inspections are conducted at any time personnel are performing work 'in the area. Anything out of the ordinary is reported to the appropriate personnel.

Personnel that operate cr maintain equipment are instructed on how to preperly operate and maintain the equipment to prevent the discharge of contaminants. Appropriate personnel receive Spill Prevention Control and Countermeasure (SPCC) training. The training includes discussion of the appropriate laws, rules and regulations.

EROSION CONTROL AND SPCC PLAN Erosion Control Plan prior to any new construction, an erosion and sediment control plan is developed. The plan includes measures to be taken to control storm water runof f, including rerouting runof f around the construction site and installing silt fences.

SPCC Plan, The site has - developed Spill Prevention Control and Counternmasure (SPCC) plans. The documents cover procedures for material transfer, storage, and spill control including location of spill cleanup supplies and egaipment. The plan is intended to satisfy the requirements of 40 CFR Part 112 and is naintained at the site.

APPLICATION OF FERTILIZERS, SOIL CONDITIONERS, PESTICIDES, AND MERBICIDES Landscaping has been implemented for erosion control- as well as beautification. As such, fertilizers and soil conditioners are applied on an "as needed" basis in accordance to the label. Soil conditioners ' and-fertilizers that are used, with the approximate annual amount, include lime 3 <

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(11,000 pounds), 10-10-10 (2,000 pounds), 27-4-14 (4,000 pounds), and 19-4-9 (1,500 pounds).

Herbicides and pesticides are applied as necessary by station personnel in accordance to the label. Herbicides are applied to areas including the isolation zone at the protected Area fence, storage yards, around the property fence, at the firing range, ball field, and switching station.

Types of herbicides, with the approximate annual amount, include Round Up (16 gallons), Knock Out (110 gallons), Boracil (600 pounds), Induce (10 gallons), Surflan (5 gallons), and Trisiec (2 gallons). Approximately 2 gallons of the insecticide Diasinon is used annually.

All of the materials that are granular are applied with a machine spreader while the liquid materials are applied with a hand sprayer. None of the materials are applied in close proximity to water.

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