ML20215G744

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Amend 10 to Environ Rept
ML20215G744
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 06/16/1987
From:
HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20215G731 List:
References
ENVR-870616, NUDOCS 8706230369
Download: ML20215G744 (10)
v • d • e


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i ENVIRONMENTAL REPORT - OPERATING LICENSE STAGE i AMENDMENT 10 j

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( / INSTRUCTION SHEET REMOVE INSERT 3.7-1, 3.7-2 3.7-1, 3.7-2 3.7-3 3.7-3, 3.7-4

--- 3.7-5 ,

--- 3.7-6 '

5.7-1 5.7-1 j

6.2-9 6.2-9  !

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l 8706230369 870616 PDR ADOCK 05000498 L PDR l

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STP ER r ,

/3.7 SANITARY AND OTHER WASTE SYSTEMS-

' 3.

7.1 DESCRIPTION

OF SANITARY WASTES

.The' design opera:ing population of the two-unit plant is 1325 persons. - The quantity of discharge is based on an average-flow of 20 gallons per day per-capita. This rate of flow, which complies with the standards of the Texas Water Commision, results in a flow of approximately.26,500 gallons per day for a two unit plant. The organic content is estimated to result in a biochemical  !

oxygen demand (BOD ) f less the 20 parts per million in the sewage plant '

S effluent. The raw sewage is expected to have approximately the composition listed in Table 3.7-1. '

No poisonous, toxic, or radioactive matter or' heavy metals are expected in the effluent, with the exception of the chlorine used for disinfection,

.3.

7.2 DESCRIPTION

OF SANITARY WASTE SYSTEMS The sewage collection system will consist of about 2,000 linear' feet,of 6-inch diameter vitrified clay and ductile. iron pipe. These gravity lines vill terminate at the wet-wells of the lift stations which pump waste to the sewage treatment plants. Effluent from the Construction Plant is pu'tpe;d into the' west branch of the Colorado Fiver. ' Effluent from the other treatment plants is pumped.into the cooling reservoir,

1. EAST SANITARY WASTE TREATMENT SYSTEM-The design capacity of the East Sanitary Waste Treatment System is.15,000 gallons per day, jo.

Lift Station The lift station consists of a precast reinforced concrete structure which serves as a wet-well for the duplex centrifugal lift pumps. Each pump has d capacity of 100 gallons per minute.

Equalization Basin A 5,000-gallon equalization basin is provided to regulate flows to the treat.

ment unat. Yr.e sewage would then be transt' erred from u a equalization basin  ;

to the aeration basin by a pneumatic ejector at a constant rate. '

Aeration Basin Four 5,000 gallon aeration basins provide 32 hours3.703704e-4 days <br />0.00889 hours <br />5.291005e-5 weeks <br />1.2176e-5 months <br /> of aerated detention at average flow. The basins are equipped to supply air at a rate of 72 cubic feet per minute by means of blowers and submerged diffusern.

Clarifier j

Sedimentation is accomplished in a 5,200 gallon hopper clarifier with an overflow rate of less than 332 gallons per day per square foot.

3.7-1 Amendment 10 1

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STP ER *l Chlorination Basin I The clarifier effluent is chlorinated during a contact period of greater than 20 minutes based on peak flow to retain a minimum free residual of 1 part per million of chlorine.

Sludge Storage Tank / Digester Excess ciudge is wasted u a storage basin / aerobic digerter, with a 5,140 gallon capacity, to which cir is supplied at a rate of at least 18 cubic feet per minute. The digested sludg,e is collected by scavenger as required and disposed offsite in accoidance with applicable federal, state, and local environmental regulations.

Air Supply Oxygen 12 provJded by two lcw presourc air blouers and submerged diffusers, The blowers can provide air at a rate of :.t laast 140 cubic feet per minute.

2. CONSTRUCTION AND WEST SA,NITARY WASTE TREATMENT LIFT STATION The lift station consists of two precast reinforced concrete structures which serve as vet-vells for duplex centrifugal lift pumps (cwo pumps per structure). Each pump has a capacity of 125 gallons per minute. The dis-charge is directed to either or both the Construction Plant or the West Plant.
3. CONSTRUCTION SANITARY WASTE TREATMENT SYSTEM 10 l The Construction Sanitary Waste Treatment System is a temporary plant not ,

expected to be in service fer the life of the STP. It consists of two j

') parallel units with a combined capacity of 60,000 gallons per day. j f

1 Aeration Bacin Twelve 5,000 gallon aeration basins pcovide 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> of aerated detention at the average flow. The basins are equipped to supply air at a rate of 210 cubic feet per minute by means of blowers and submerged diffusers.  ;

I Clarifier i Sedimentation is accomplished in four clarifier basins with a total capacity of 20,000 gallons and an overflow rato of less than 600 gallonn per day per square foot.

Chlorination Basin I

The clarifier effluent is chlorinated during a contact period of greater l than 20 minutes based on peak flow to retain a minimum free residual of 1 I part per million of chlorine. j j

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3.7-2 Amendment 10 O) i 1

l STP ER Sludge Storage Basin / Digester k,n) s Excess sludge is wasted to two storage basin / aerobic digesters, with a 5,000 gallon total capacity, to which air is supplied at a rate of at least 42 cubic feet per minute. The digested sludge is collected by scavenger as required and disposed offsite in accordance with applicable federal, state, and local envirormental regulations.

I Air Supply Oxygen is provided by four low pressure air blowers and submerged diffusers.

The blowers can provide air at a rate of at least 374 cubic feet per minute.

4. WEST SANITARY WASTE TREATMENT SYSTEM The West Sanitary Waste Treatment System consists of two parallel units with a combined capacity of 60,000 gallons per day.

Aeration Basin Sixteen 5,000 gallon acration basins provide 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> of aerated detention at the average flow. The basins are equipped to supply air at a rate of 210 cubic feet per minute by means of blowers and submerged diffusers.

Clarifier Sedimentation is accoaplished in four clarifier basins with a total capacity of 20,000 gallcos and an overflow rate of less than 600 gallons per day per 10 O square foot.

Chlorination Basin The clarifier effluent is chlorinated during a contact period of greater than 20 minutes based on peak flow to retain a minimum free residual of 1 ,

part per million of chlorine.

Sludge Storage Basin / Digester Excess sludge is wasted to two storage basin / aerobic digesters, with a 10,300 gallon total capacity, to which air is supplied at a rate of at least 42 cubic feet per minute. The digested sludge is collected by scavenger as required and disposed of offsite in accordance with applicable federal, state, and local environmental regulations.

Air Supply ,

Oxygen is provided by four low pressure air blowers and submerged diffusers.

The blowers can provide air at a rate of at least 374 cubic feet per minute.

5. NUCLEAR TRAINING FACILITY SANITARY WASTE SYSTEM The design capacity of the Nuclear Training Facility Sanitary Waste System l is 14,000 gallons per day, p.

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3.7-3 Amendment 10

STP ER Lift Station The lift station consists of a precast reinforced concrete structure which O-serves as a wet-well for the duplex centrifugal lift pumps. Each pump has a capacity of 38 gallons per minute.

Aeration Basin Three 5,000 gallon and one 2,500 gallon aeration basins provide 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> of aerated detention at the average flow. The basins are equipped to supply air at a rate of 69 cubic feet per minute by means of blowers and submerged diffusers.

Clarifier 10 Sedimentation is accomplished in a 5,000 gallon hopper clarifier with an overflow rate of less than 800 gallons per day per square foot.

Chlorination Basin The clarifier effluent is chlorinated during a contact period of greater than 20 minutes based on peak flow to retain a minimum free residual of 1 part per million of chlorine.

3.7,3 STANDBY DIESEL ENGINE EXHAUST Three standby diesel engines per unit are maintained at the power station for emergency use should the offsite power supply to the station be lost. Each standby diesel engine is normally operated for 1 to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> per month to ensure operability should an emergency situation arise. 7 The standby diesel engines exhaust to the atmosphere through muffler systems.

Effluents associated with the operation of these enginer generally consist of particulates, unburned hydrocarbons, nitric oxides, various oxygenated com-pounds, and carbon monoxide. No treatment is planned for the effluents from the 3 emergency diesels because of the relatively low emission pantities plus the i short periods of operation required for periodic testing and for providing power I

.when the normal power supply system is not available. The estimated discharges I of sulfur dioxide and nitric oxides from the diesel engine gaseous effluent (in Ibs/1,000 gal fuel) are 75 and 518 respectively. Each diesel engine burns about 300 gallons of no. 2 diesel oil per hour at its continuous rating. The opacity of the exhaust is not expected to exceed 5 percent based upon 15 second Bacharach reading at rated load.

3.7.4 AUXILIARY BOILERS An auxiliary steam supply is required to furnish steam for the main deaerator, 7 the turbine gland seals, and waste processing when steam is not available from the nuclear steam supply system. The source of this auxiliary steam will be two oil-fired auxiliary steam boilers. The boilers will operate for approxi-mately 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> per year. The maximum permitted heat input of each boiler is 185 MBtu per hour. Stack gases will discharged directly to the environment. 7 O

3.7 4 Amendment 10

STP ER Based on firing no.22 fuel oil with 0.5 percent sulfur, by weight, the antici-

N pated release of SO at maximum rated load is 92.5 pounds mass per hour. l7 v) 3.7,5 NONRADIOACTIVE SOLID WASTES Normal domestic solid wastes resulting from the plant operation will be disposed of ih a manner consistent with state, federal, and local environmental regula-tions.

I G 3.7-5 Amendment 10 1

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1 U STP ER-TABLE 3.7-1 EXPECTED COMPOSITION OF RAW SEWAGE

. . i Constituent.- Concentration, ag/ liter Solids, total' 675 Dissolved 375

' Suspended,' total 300 Fixed 75

' Volatile. 225-Settleable solids,'ag/ liter 15 Biochemical oxygen demand, 5 day, 20*C- 300 Total organic carbon 150; 10 Chemical oxygen demand .350 ~

Nitrogen (total as N) 25 l Organic 10

- O- Free ammonia 15.

Phosphorus (total as P) 8 Organic 3 Inorganic 5 Chlorides- 20 Alkalinity (as Caco ) 75  ;

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(D' Amendment 10 3.7-6

p STP ER 5.7 OTHER EFFECTS

() The material presented in the " Environmental Report--Construction Permit Stage" requires no updating except as discussed below.

5.7.1 Changes in Land Use.

All permanent plant roads'will be paved or constructed of crushed limestone or 9 other suitable material, Unpaved road surfaces will be treated, as necessary, during plant operation to minimize fugitive dust emissions. Construction roads that are not intended for use during operation will be removed. The l10 road bed will be. graded and seeded to conform to the natural surroundings.

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.O 5.7-1 Amendment 10

STP ER A computerized accounting system will be established to maintain and update

,e hourly averages of diffusion meteorology, measured effluent release rates, and~

inventory of fission products released. The system will include.the required software to permit plant operators to make short-period dose calculations on demand.- For long-period dose calculations, a permanent file of onsite meteorological data vill be maintained. 7 6.2.4,2 Fog Monitoring Program The impact of operating the Cooling. Reservoir on local meteorology will be assessed by implementing a two-phase fog monitoring program. The first phase began during May 1987 and will continue until commercial operation of Unit 1.

The second phase will begin following startup of Unit 2 and will continue for one year. 10 Fog monitoring is accomplished by the operation of two fog visiometers. .One visiometer is located on FM 521 approximately 1 mile northwest of the Units.

A second visiometer is located approximately 11 miles west-southwest of the site and will serve as a control location. The visiometers will provide a continuous data record for the monitoring periods.

6.2.5 NONRADIOLOGICAL ECOLOGICAL MONITORING The applicant is currently evaluating the need to conduct operational non-radiological ecological monitoring. If such monitoring is deemed 9

necessary, a monitoring program will be developed and incorporated into the ER-OL by amendment.

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O 6.2 9 Amendment 10

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. STP ER Question 291.20-

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( ); Is the 49,500 gal of waste water produced when each train is regenerated an aggregate'of the cation exchange unit, anion exchange unit, and the mixed-bed unit, or is this the volume of waste produced per unit? If an aggregate, specify the constituent streams and the frequency of occurrence.

Response

The waste water genereted during makeup demineralizer system regeneration is characterized below. Please note that this represents approximately 48,000 gallons per train.

Train A Frequency (Days) Gallons Generated Softener 3 10,500 Cation 3 19,000 Anion 1.5 12,000 Mixed Bed 40 6,500 10 Train B Frequency (Days) Gallons Generated Softener 3 10,500 g- Cation 3 19,000 t Anion 1.a 12,000 Mixed Bed 40 6,500 t

) G-35 Amendment 10

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