ML20127G825

Proposed Tech Specs Re Environ TS

ML20127G825
Person / Time
Site:	Monticello
Issue date:	10/29/1973
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20127G782	List: ML20127G776 ML20127G795 ML20127G825
References
NUDOCS 9211170434
Download: ML20127G825 (20)

Text

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', '. Exhibit A PROPOSED APPENDIX B EINIRONMENTAL TECilNICAL SPECIFICATIONS FOR MONTICELLO NUCLEAR GENERATING PI. ANT NORTi!ERN STATES POWER COMPA!W 1.0 DEFINITIONS A. Onsite: Any area included within NSP owned property as indicated on Figure 1.0-1.

B. Offsite: All other properties or areas not considered onsite.

C. Discharge Canal: Tnat portion of the plant facilities starting at the r.ooling tower pump house and extending to its intersection vith the river's edge (See Figure 1.0-2) .

D. Point of Discharger End of the discharge canal at the river's shoreline.

E. Ambient River Temperature The temperature of the river water flowing ints the plant incake unaffected by heat discharge from the plant.

F. Environmental Fvent: Exceeding a protection condition.

G. Protection Conditions: The quantitative specifications as found in Section TS B-2.0.

H. Week: A calendar period commencing on Sunday and extending through the following Saturday.

I. Month: Each of the twelve calendar periods designated as January, February, March, April, May, June, July, August, September, October, November, or December.

J. Year: The calendar period commencing on January 1 and extending through December 31.

k 9211170434 731029 PDR ADOCK 05000263-P PDR TS-B.l.0-1

. _ _ - . _ _ _ _ - _ _ - _ - - . _ . ~ _ . - - . - - -

4 . ,

. k Exhibit A 4 .

2.0 PROTECTION CONDITIONS 2.1 Thermal 4

2.1.1 Maximum Change in Temperature (delta T)

Across the Condenser l Obiective: To reduce possible entrainment loss by limiting the delta T across the inlet and outlet of the condenser.

Specification: During any consecutive seven-day period the arithmetic mean delta T shall not exceed the limits of Table 2.1.1-1.

Table 2.1.1-1 calendar Period Maximum delta T, April 1 - October 31 35'F November 1 - March 31 43'F Basis: Mortality of entrained organisms is dependent on the upper incipient lethal tem-perature. For the period April through October, the delta T of 35'F should provide sufficient protection. The period November through March represents low ambient temperature during which corresponding higher temperatures can be toleraced for short-term durations.

2.1.2 Maximum Receiving Water Temperature Obiective: To limit the maximum Mississippi River temperature downstream of the point of discharge.

Specification: The maximum temperature of the I river as a result of plant operation, shall not exceed 90*F over more than one-half the surface 1 l

width of the river.

I TS-B.2.1-1

Exhibit A 4

Basis: The environmental analysis as found in the Final Environmental Statencnt (FES) related to operation of Monticello Nuclear Generating Plant, Northern States Power Company, November 1972, published by USAEC Directorate of Licensing, has determined that the protection condition is sufficient for protection of the environment.

2.1.3 Rate of Change of Discharge Temperature Obiective: To limit the rate of temperature decrease for protection of fish in the discharge canal during scheduled reductions in power during the months of October through April.

Specification: For the months of October through April, the rate of temperature decrease shall not exceed 5*F per hour at the point of discharge during scheduled power decreases of 15% or more.

This specification does not apply to emergency shutdown, testing procedures, or initiation of cooling tower operation.

Basis: A fish kill due to cold shock during plant reductions in power is most likely in the wintertime. The protection condition is sufficient to protect the natural fish popula-tions from cold shock during normal power operation.

2.2 Hydraulic 2.2.1 Flow Rate Restrictions Obiective: To limit the amount of water appropriated.

Specification: Whenever the river flow at the plant is less than 860 cfs but greater than 240 cfs, the maximum allowable appropriation from_the river shall not exceed 75% of the river flow at the intake. During river flows above 860 cfs the plant shall withdraw no more than 645 cfs.

TS-B.2.2-1

l Exhibit A 4

Basis: The Mississippi River at Monticello experiences a high variation in flow rates.

The specification allows for plant flow rates in proportion to river flow such that the present quality of the river's biota is maintained.

I 2.3 Chemical

'l 2.3.1 Chlorine

Obiective: To regulate the use of chlorine for cleaning of the condenser and service water system.

! Specifications During chlorination periods the i free chlorine residual at the point of discharge

to the river shall not exceed a concentration of 0.05 ppm for more than two hours per day or 0.1 ppm for more than 30 minutes per day. If continuous chlorination is utilized, the free chlorine

, residual at the point of discharge shall not exceed 0.002 ppm.

Basis: The main condenser and service water system is normally treated four times per day for 30 minutes during each treatment. The resi-duals as specified provide sufficient protection of the indigenous aquatic biota.

2.3.2 Retention Basin Effluent Chemicals I

obiective: To limit the amount of chemicals re-leased from the retention basin.

Specificat_ ion: The following maximum limits shall apply to dischargesfrom the chemical retention basin:

lbs/ month Ibs/vear

, Sulfate (as Sog) 2,000 12,000 Sodium (as Na2 ) 1,000 6,000 Phosphate (as P) 1 6 Calcium (as Ca2) 250 1,200 Bicarbonate (as HCO3 ) 350 1,500 TS-B.2.3-1

i 4

i Exhibit A I i

In addition the effluent from the retention  !

basin shall not exceed an arithmetic monthly mean of 30 ppm added suspended solids and 25 Jackson Turbidity Units (Jru's).  ;

Basis, The mmounts of chemicals as listed-in the protection condition allow for monthly variations'in chemical discharges, yet insure protection.because the facility cannot discharge continuously, year round, at levels  ;

equal to the monthly maximum.

2.3.3 pH

! Obiective: To limit the range of pH levels

! due to plant additions in water discharged to the river.

4

Specification

The pH of water discharged to ,

the river shall be no lower than-~6.5'nor i greater than 8.5.

Basis: A pH range of-6.5 to 8.5 provides suffi-cient protection of the river's natural plant and animal populations.

3.0 M,0NITORING REQUIREMENTS 3.1 Thermal 3.1.1 Maximum Change in Temperature '(delta T) across

.the condenser.

Obiective: To measure the delta T across the condenser.

Specification: The delta T across the-condenser will be monitored once por day.

Basis: The dolta T across the-condenser does not fluctuate-greatly'over a 24-hour period.during' constant ' plant power ' levels.: Thus, measurement of the delta T once per day;will provide the necessary monitoring frequency.

4 TS-B.3.1-1

_. _ , _ _ _ . _ . - _ , _ _ _ . . . _ . . . _ - . . . . . . . ~ . _ _ _ . . . . - . _ , . . _ . _ . _ . . . _ _ . . _ . _ . . . _ . , _ _ _ -

. ~ . ~ .

i Exhibit A i

! 3.1.2 Maximum Receiving Water Temperature i

! Obiective: To measure the maximum receiving l water temperature.

4 Specification: The receiving water temperature l shall be calculated once per day whenever the 3

temperature of the circulating water at the j

- point of discharge is equal to or greater than l q 90*F.

Basis: If the discharge temperature does not exceed 90'F the protection condition of TSB 2.1.2 cannot be' exceeded. Compliance with the protec-tion condition will be made with the use of a  !

l plume model developed and verified with physical  !

data by January 1975. The model will be used once per day to demonstrate compliance when the 1

discharge temperature is in excess of 90*F.

Periodic verification of the model temperatures will be made throughout the year.

. 3.1.3 Rate of Change of Discharge Temperature Obiective: To measure the rate of temperature drop at the point of discharge during the months of October through April.

I Specification: The rate of tenperature' drop at the point of discharge will be measured during normal plant power decreases of 15% or greater during the months of October through April. This specification does not apply to emergency shutdowns, testing conditions, or initiation of cooling tower operation.

i Basist Decreases in power levels of 15% or less are not expected to cause any appreciable effect on the resident fish population-in the discharge canal.

__ , ._ . . . TS-83 -? - - .

Exhibit A 3.2 Ilydraulic 3.2.1 Plow Rate Restrictions Obiective: To monitor the water appropriated from the river.

Specification: Once per day the amount of water appropriated from the river and river flows will be recorded.

Basis: changing river flows require daily rnonitoring of the river to determine circulating water system operating modes to minimize aquatic environmental impacts.

3.3 chemical 3.3.1 chlorine Obiective: To ensure the amount of free residual chlorine discharged during chlorination does not exceed the protection condition.

Specification: Once each month during a chlorination cycle, a sample will be taken at the point of discharge and analyzed for free residual chlorine.

Basis: During normal power operation, the service water system will be chlorinated to control slime growth in the system, curves for chlorine concentrations just after passage through the condenser,. feed rates and con-centrations at the point of discharge will be developed. The feed rates will be tested to insure that the free residual chlorine does not exceed the protection condition. The test will consist of taking three samples at the start, half way through, and at the end of a chlorination cycle. These samples will be taken at the point of discharge to the river.

If the free residual chlorine at this point is I

i i

TS-B.3.3-1

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-  ! 1 s

Exhibit A found to be greater than the protection con-dition, the feed rate will be reduced until the concentration is less than or equal to the protection condition. Once the established feed rates or condenser outAet-concentrations have been verified to produce free residual chlorine concentrations less than or equal to the pro-tection condition, it will not be necessary to sample the discharge water during every chlorina-tion cycle as long as the chlorine injection feed rate or condenser outlet concentration re-mains less than or equal to'the maximum verified feed rate. A monthly sample at the point of discharge will be taken during a chlorine in-jection cycle to verify.that the protection condition is not exceeded. All analyses-will be made by the appropriate sampling technique and analytical methods-as outlined-in the most recent edition of Standard Methods for the Examination of Water and Wastewater published by the American Public Health Association.

3.3.2 Ret:ntion Basin Effluent Chemicals Obiective: To measure the amount of chemicals discharged from the retention basin.

Specification: Once per month,-the-amount of chemicals within the retention-basin will be determined. Once per week, the_ suspended solids levels and turbidity of the retention pond effluent;will be determined and the-monthly arithmetic mean will be calculated from the_ weekly samples.

Basist. Carefully controlled releases from the retention basin will provide.the necessary control ofichemical releases. The monitoring frequency _ provides forf sufficient sampling _ to_

determine compliance with the-protection conditions.

f j

TS-B.3.3 -l

Exhibit A 3.3.3 pH Objective: To measure the pH levels at the point of discharge to the river.

Specification: The pH value of the discharge water prior to entering the river will be measured two times per week.

Basis: A measurement frequency of two times per week will insure control of pH value and monitor compliance with the protection condition.

4.0 ENVIRONMENTAL SURVEILLANCE AND SPECIAL STUDIES 4.1 Biological 4.1.1 Aquatic A. General Ecological Survey Objective: To evaluate the impact of the facility on the biotic environment.

Specification:

1. Investigate any changes in the biota that may occur when comparing preoperational data to operational data and control stations to experimental stations.

2. Identify any change in the ecosystem induced by operation of the plant.

3. Evaluate the significance of induced changes, if any, on the sustenance of a healthy ecosystem as determined in preoperational studies or as defined by regulatory standards.

Basis: A general ecological survey wat initiated in May 1968, three years prior to the beginning of plant operation in June 1971. This program has been extensively expanded since its inception.

Information gathered from preoperational environ-mental studies was published in the 1968, 1969 TS-B.4.1-1

. c Exhibit A 4

and 1970 Monticello Nuclear Generating Plant 4

Annual Environmental Monitoring and Ecological Studies Program Reports.

1. The program may be modified as necessary I to accommodate sampling requirement changes.

This program has been continually reviewed and reevaluated since its conception.

After 60 months of data have been obtained from the beginning of commercial operation, 4

some of the special studies in Section TS B-4.1.1 may be eliminated if the results of these studica are conclusive and show no 1 significant harmful environmental effects.

)  !

2. These changes and results will be presented l l

in the Annual Environmental Monitoring and Ecological Studies Program Report for the facility.

3. These studies are performed as foi.ows:

The program for aquatic ecological studies of the Mississippi River in the vicinity of the Monticello Nuclear Generating Plant has been designed to establish ecological charac-teristics prior to and following plant opera-tion. The preoperational data are being com-pared with operational data to verify that the plant is not deleteriously altering the aquatic ecosystem. This study began 3 years prior to plant operation and will continue until the specific effects of the plant can be determined and the data show a stabilized aquatic environment. The monitoring program is funded entirely by NSP.

~

The studies are organized to investigate the aquatic biota and the physical and chemical composition of the environment. Species are identified and their population and size are determined. The food habits and reproductive cycles of the dominant species are studied TS-B.4.1-2

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1 Exhibit A i

whenever possible. Dae to the seasonal fluctuations of those fac ars, most  ;

j sampling programs are carried out on a l

' scheduled year-round basis. It should be f I

3 noted that this program is designed to remain flexible, so that changes can be

made immediately if required. Factors to be studied are

4..

i  ;

i Diotic communities  ;

Periphyton l

Bcnthic Macroinvertebrates '

Fish

' Aquatic Plants i Physical and Chemical Water Parameters Dissolved Oxygen Biological oxygen Demand i Temperature pH

! Conductivity Turbidity

! Current Velocity J

Total Dissolved Solids Total Alkalinity Total Phosphate Ortho-phosphate Nitrate Nitrogen

' chlorides Iron Sulfates Basic procedures for these studies are:

~

a. Periphyton i

Periphyton' sampling was initially con-ducted at 13 locations at the Monticello facility. Five of these sites were up-stream. At present, there are 7 sampling locations retained from the original pro-gram. The locations are shown in Figure TS B-4.1.1.

4 TS-B.4.1-3

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)

Exhibit A j

There is one control station upstream

,' from the discharge canal and six down-i stream stations. Two of these down-stream stations are outside the thermal i plume. The samples are analyzed every 1 two weeks except when floods destroy i sampling devices. Data on chlorophyll j content are determined from the samples, i Ice conditions may restrict sampling during the winter months.

i'

b. Benthic Macroinvertebrate Study

In the original program there were 8 sampling transects. However, since no significant population changes were noted due to plant operation, the pro-

, gram has been reduced to one control transect upstream from the discharge canal and two downstream transects. Each transect consists of at least three stations spaced equidistant from each other. Four artificial substrates are located on the bottom at each station Figure TS B-4.1.1-2) . These are removed

monthly for enumeration and identifica-l tion of attached organisms. Some stations may not be sampled in the winter when i

unsafe ice conditions exist or when floods

remove some sampling devices.

! In addition, qualitative. invertebrate

, sampling is conducted monthly along the shoreline during the open water portion of tlua year.

, c. Fish -

Electro-fishing and seining are the dominant methods used in the fish study.

In the future trapnetting will be used as an additional sampling method. Fish l

l L TS-B . 4.1 ,

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I i

i . ', t Exhibit A i

are measured and weighed and sotae scales i

are removed for age and growth studies. '

! Some fish are marked with plastic or metal tags and returned to the river to study their movement and migration pat-terns. A creel census of the river fishery is being conducted, with the temporal length of census dependent upon 2 angler presence. Generally, the consus runs from April to November.

A weekly fish connus will be conducted in the discharge canal during the winter months to determine species distribution and abundance. This data will be used' to predict possible harm should a winter i shutdown occur.

! d. Physical and Chemical Water Quality Parameters The water quality study includes the physical and chemical parameters of water which might affect aquatic life. .The chtmical facto.es studied and their fro-

. quency of measurement is au follows:

Parameter , Frequency l

Dissolved Oxygen Every two weeks Biological oxygen Demand Every two weeks Temperature Continuous pH Every two weeks Conductivity Every two weeks Turbidity Every two weeks Current Velocity Every two weeks Total Dissolved Solids Every two weeks Total Phosphate Every two weeks ortho-phosphate Every two weeks Nitrate Nitrogen Every two weeks

~

Chlorides Every two weeks Iron Every two weeks i Sulfates Every two weeks

• TS-B.4.1-5

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^

i Exhibit A

A subsurface sample of one gallon of water

is taken from each of three stations. l one of these stations is above the intake j structure. Two are downstream from the l discharge canal on the plant side of the I j

river. Oxygen determination is made on 1 site; a.1.1 other parameter determinations ,

a are made in the laboratory. River temper-atures are monitored by 9 continuous re-corders upstream-and downstream from the plant discharge canal.

B. Impinged and Entrained Fauna objectives To determino monthly variations in species, weight, size and numbers, of all life stages of fish entrapped; to identify and count any other impinged vertebrates and to record that portion of the entrained fauna which is killed due to passage through the plant.

Specification: Impingement a:.d entrainment

! studies shall be carried out for two years after the Appendix B Environmental Technical Specifica-

tions are in effect. Impingement studies shall i

be conducted every two weeks when the plant is operating. Entrainment studies shall be con-

, ducted monthly when the plant is operating,

except for that portion of the study which assesses mortality. Assessment of the mortality of en-trained organisms shall be conducted monthly from April through September and once every three months from October through March when the plant is operating.

Data collected during plant operation will be compared with appropriate control station data, thereby providing information to help determine the effect of the plant upon the impinged and entrained biota.

Basis:

1. Fish Impingement Presently the plant in designed to return all impinged fish from the intake traveling TS-B.4.1-6

- - . - = _ . - . . . - _ - . - - - - . . - - _ - . _ - = . - - - .

j . .

I Exhibit A screens to the river via a low gradient ,

i sluice canal. Impinged fish are removed l from the screens by periodic washings. All j screen washed material is sampled by placing i a -inch mesh net in the sluice canal. All j fish collected will be identified, counted  !

l and measured to determino monthly and sea-l sonal trends in impingement and survivorship. l 2 Impingement of Other Vertebrates and Macroinvertebrates 1 .

) If aquatic or semi-aquatic vertebrates 1 (such as salamanders, frogs and snakes) or j macroinvertebrates (including crayfish and

! clams, but excluding insects) are impinged, 4

they will be identified, counted and reported.

3. Entrainment s

a. Estimates on the number of entrained ichthyoplankton, including organisms

] up to 3/8 inch in diameter, shall be made monthly when the plant is operating.

These organisms shall be collected over

, a 24-hour period from the discharge gate-wells, identified, counted and reported.

, b. In conjunction with the above program,

! studies shall be conducted monthly from April through September, and once every three months from October through_ March when the plant is operating to assess the survivorship of entrained macroin-i vertebrates, ichthyo and zooplankton.

Additional studies may be carried out,

! particularly if abnormally large numbers of a specific organism are entrained (e. g. , greater than that found in an equivalent volume of river water from the main channel). Representative samples of the intake and discharge waters will be collected. These samples shall be l

l l

I t-l TS-B.4.1-7

- . - - _ = - _ ..- .- . . -_

Exhibit A examined at the two locations. The dif ference between the intake and dis-charge mortality values shall be the mortality figure attributable to plant

passage.

5.0 REPORTING REQUIREMENTS 2

5.1 Routine Reports 4 A. A Semi-Annual Environmental Studies Report covering the previous six month's surveillance monitoring shall be submitted within 60 days after January 1 and July 1 of each year. This report will include a summary description of any environmental event, summary of data from section TS B-3.0 and-a summary of surveys completed within section TS B-4.0.

B. An Annual Environmental Monitoring and Ecological Studies Program Report covering the year's operations 4

and surveillance monitoring shall be submitted by July 1 of the subsequent year.

4 1

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