Text

Environ Operating Rept,Part A:Nonradiological Rept for 1980
	ML20003E606
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Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	03/31/1981
From:	; CONNECTICUT YANKEE ATOMIC POWER CO.
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l CONNECTICUT YANKEE ATOMIC POWER COMPANY HADDAM NECK PLANT HADDAM, CONNECTICUT ANNUAL ENVIRONMENTAL OPERATING REPORT PART A: NONRADIOLOGICAL REPORT January 1,1980 --- December 31,.1980 Operating License No. DPR-61 Docket No. 50-213 i

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March 31, 1981

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TABLE OF CONTENTS ETS Page Section e

1.0 INTRODUCTION

1.1 -Connecticut Yankee 1

1.2 Purpose of this Report 1

2.0 LIMITING CONDITIONS FOR OPERATION 2

-2.0 2.1 Thermal 2

2.1 2.1.1 Maximum AT Across the 2-2.1.1 l

Condenser and Maximum Discharge Temperature 2.1.2

' Rate of Change of 3

2.1.2 Discharge Temperature A

2'.1.3 Deicing Ope'ations.

4 2.1.3 r

. 2.2 Chemical 4

2.3

'2.2.1 Biocides 4

2.3.1 2.2.2 pH 4

2.3.2

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3.0 -ENVIRONMENTAL SURVEILLANCE-17 3.0

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3.1 Nonradiologichl Surveillance 17 3.1 3.1;1_

Fish Impingement-17 3.1.1-13.1.~ 2 Meteorological. Monitoring 17' 3.1.2

'4 0 SPECIAL SURVEILLANCE RESEARCH OR~ STUDY' 20 4.0 ACTIVITIES 4.1 _ Fish Deterrent Studies 20 4.1

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4.2 Shad Moeitoring Program 20 4 22

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4.'3-. Phyt.oplank'on Studies' 20

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_ INTRODUCTION 1.1 : Connect icut Yankee This environmental report has been prepared for the Connecticut 3

Yankee Atomic Power Company (CYAPCO) by the Northeast Utilities Service C.ompany (NUSCO). CYAPCO operates the Haddam Neck Plant, hereinafter referred to as Connecticut Yankee (CY).

NUSCO is responsible for engineering and administrative support of the CY operation. The plant is located in the Town of liaddom, Connecticut on a site of approximately 525 acres.

CY was one-of the first large nuclear base load units to go into operation in the United States.

It was constructed in 4

accordance with Construction Permit No. CPPR-14 issued by the AEC on May 14, 1964, and has been in commercial operation since January 1,1968. The nuclear unit is a pressurized water reactor with a once-through condenser cooling system, initially licensed to produce 1,473 MWt or about 490 MW of gross electrical power. On March 11, 1969, the plant was licensed to operate at its design rating of 1,825 MWt or about 6CO MW of gross electrical power.

1.2 Purpose of this Report This repnrt has been prepared in compliance with Section 5.6.1-a.

of the. connecticut Yankee Environmental Technical Specifications (ETS), Document Number 50-213.

Included in the report are summaries, interpretations, and statistical evaluation of the results of the nonradiological environmental surveillance activities-(ETS Section 3.0) and the environmental monitoring programs required by limiting conditions for operation (ETSE Section 2.0) for the report period January 1,1980 through December 31, 1980.

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2.0 LIMITING CORDITIONS FOR OPERATIONS 2.1 Thermal Temperature and pH are continuously monitored by sensing units located in front of the intake structure and in the discharge canal. The continuous output of the sensors is reduced to digital form using a Data General Model 1220 Nova minicomputer located at Connecticut Yankee and average values for each are recorded every 15 minutes. At the end of each hour, a host computer system at Northeast Utilities Service Company telephones the Connecticut Yankee field computer and logs the data on disc storage. The data are examined twice daily for validity and edited as necessary on a monthly basis. A permanent annual record is maintained on magnetic tapes.

If the field computer is not called for a period of two hours, it automatically prints out the data on its teletype and punches a paper tape for later incorporation into the data record. An analog record is maintained at the plant and is used to fill in data gaps caused by digital system failure.

Temperatures are also measured by sensors located in the condenser inlet and at the outlet of each of the four condenser waterboxes. They are recorded hourly by the plant computer and used as a back-up or secondary source of data at times when the primary system sensors or processing system are inoperative.

2.1.1 Maximum AT Across the Condenser and Maximum Discharge Temperature Table 2.1 shows ranges of intake and discharge temperature ar monitored by the primary system, their

-differences, and the maximum hourly rate of change of discharge temperature for each day during the period January 1 through December 31, 1980. When the primary monitoring system was inoperative, data from the secondary system were incorporated into the record. During May, June, and July, when the' plant was_ shut down for refueling, temperature data were not taken for an extended period because of sensor malfunction.

Since no heat was being produced, no thermal monitoring was required.

Intake temperatures ranged from 30.4 F in January, February, and Decemberuto 86.0 F in August Discharge temperatures ranged from ambient during periods of shutdown to.109.4 F on August 10 and 11.

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The specified maximum temperature increase (A T) of 26 F was exceeded _ for several periods less than 24

(

hours during routine operation. Most of these occurred during the period of deicing when a 10%

allowance is made. The maximum 'AT of 33 F was exceeded on February 19 and 20.

As required by Section 2.1.1.7(d) and (e), the intake temperatures measured by the primary monitoring system were correlated with those measured by the secondary system in the condenser intake waterbox.

The correlation equation is:

T

= 0.991 Tgy + 0.53 (2.1-1) py where Tpy = primary intake temperature Tg = secondary intake temperature

<ith a correlation coefficient of r = 0.990 Prior.to May 2 and after December 14, the intake water was warmed for purposes of deicing as permitted by section 2.1.3.

During those periods, Tpy = 1.042 TSI - 9.83 (2.1-2) with a correlation coefficient of r = 0.9320.

Similarly, discharge temperatures monitored by the primary system can be correlated with the average of condenser outlet temperature measured by the secondary system by the following:

- 0.27 (2.1-3)

Tpg = 1.009_TSD where T Primary discharge temperature ( C)

PD LTSD = secondary discharge temperature ( C)

'with'a correlation coefficient of r = 0.9860 2.1.2 Ra.e of Change of Discharge Temperature The hourly rate of change of-discharge temperature exceeded 8 F (specified in Section'2.1.2.1) on February 19 during an emergency load drop-caused by high chlorides in the steam ' generator; on March 27 due to a tripLcaused by a_ false signal _ indicating high containment pressure; on November:18 following a manual trip due to.two dropped rods; and on November 20

due to a spurious turbine trip from full load. Since these were for the protection of plant equipment, they were not violations-as specified 'in Section 2.1.2.2.

On March 29,' a decrease in discharge temperature of 9.4 F per hour' occurred when two circulating water pumps:were turned on:during startup at:25% load.

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-2.1.3 Deicing Operations The periods of deicing operations in 1980 were January 1 through May 2 and December 14 through December 31.

2.2 Chemical 2.2.1 Biocides Weekly grab samples have been collected in front of the intake structure and in the discharge canal during the chloripation period. These were analyzed for total residual chlorine using the amperometric titrator. No detectable chlorine was found in the intake water from the river or in the plant discharge.

2.2.2 pH pH was monitored continuously at the intake and in the discharge canal. Values of' discharge pH are included in Table 2.1.

When the sensor systems were inoperative, weekly grab samples were taken and these pH values have been incorporated into Table 2.1.

The continuous monitor was checked by weekly grab

-samples which were collected during periods of discharge and analyzed using standard methods.

On several occasions, the pH at the discharge fell below the level of 6.8 specified in Section 2.3.2.1 and on other occasions it exceeded 8.5.

In all-but one of these instances, the change in pH is less than or equal to 1.0 as permitted by Section 2.3.2.

On May 2 the change in pH indicated by the EDAN digital data exceeded 1.0 for a period of less than one hour due to an unexplained sudden rise in intake pH.

Prior to that hour, the intake pH reading was 7.0 vs.

the indicated discharge pH of 6.4.

There was no reason to expect any difference and grab sample

checks on the same day indicated 6.66 and 6.76 respectively. The strip chart record of pH logged in

.the' control room did'not confirm this change in intake pH.

It is probable that the pH change was less than 1.0 and the indication was. caused by a summation of calibration errors which are well within operating requirements.

This calibration was corrected after-the refueling outage which began May 3.

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'S TABLE 2.I

- CotNECTICUT YANhEE STATI0t1

- MONTHLY' WATER QUALITY DATA

SUMMARY

DATA PERIC3

11 JAN 60/0015

. 31 JAN 80/2315 PARAMETER DAY

- PH R ANGE IHTAKE TEMPERATLGE-DISCHARGE TEMPERATURE TEMFEPATUNE PISE MAX.

NI N.' AVE.

MAX.

MIN.

AVE.

MRC MAX.

MIN.

AVE.

1 6.9-6.8-39.4.34.0 35.1 64.4 59.9 61.2-4.5 27.7 24.1 26.2

-2 6.8-6.8 36.1 33.4. 34.3 61.5 58.6 60.3 2.9 27.0 24.1 25.9 3'

37.4 32.9 34.2 61.7 /59.0.59.8

-2.5 26.1 23.9 25.5 4

35.6 32.2 33.5 -

59.7 58.5 59.3<

0.7 27.0 24.8 26.0 5.

40.1._ 31.5 33.8 59.7. 58.3 59.2 1.4 28.1 21.2 25.8 6

37.9 30.9.33.2 61.7 57.2 58.4

.4.1 27.4 22.7 24.9 7

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-41.9 30.6 33.2 64.2-57.7 59.2 5.9 27.4 22.3 25.8 8

me**-***e 33.8 31.5 32.2 59.0 57.6 58.4

-0.7 27.5 25.2 26.3 9

33.6 -30.6 32.1 59.0 57.6 58.4

-0.5 27.9 25.6 26.6 10-waan-wwee 37.9 31.1 32.6 59.5 57.7 58.6 0.5 28.4-25.9 26.8 11:

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41.2 31.5 33.9 59.7 '57.7 58.3

-2.0 27.0 25.2-26.2 12.

36.1 33.4 34.4.

61.5 59.0 60,1

-0.9 28.1' 23.8 25.6 I

13.

36.1 33.1 34.9 62.4 60.3 61.2 0.7 27.7 25.7 26.6

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35.6 32.7 34.1 62.1-59.0 60.0' 2.5 - 27.4 23.6 25.9 15

'm***-****

36.1.31.3 33.9 61.5 59.0 59.8

-2.5 28.8 24.5 26.1 16 40.8 34.0 35.7-65.5 59.2 61.2

.6.3 27.4 21.1 25.o

-17 a**m-****

43.0 34.7 36.6 65.3 ~ 59.5 61.5 3.1-25.7 22.3 24.6 18 41.9 33.6 35.7 6b.5 59.7 61.1' 5.8 27.4 21.8 25.0 19 36.7 34.5 35.8 t2.1 59.9 61.0

-0.7 26.3 24.1 25.4 20 aven-a**m 37,4 34.7 36.3 63.5 55.0 61.1

-5.8 28.1 18.7 25.1 21

- - - .a***

37.0. 34.7 35.8-63.0 61.0 62.0

-0.9 27.2 24.7 26.2 22.

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42.1. 34.3 36.3-66.2 61.5 ~63.1

-2.5 27.5 24.1 25.9 23 me.*-****

.41.0 33.4 35.6 65.3 60.4 61.9 4.1 26.8 24.3 25.7 24-e***-****

34.52 31.3 33.2 61.0. 58.8 59.7 0.5 28.8 25.2' 26.5 25 36.3132.0 33.0

.61.0 58.8 59.9 1.8.

'27.9 23.8 26.7 26 33.6 31.5 32.4 60.4 57.7 59.3

-1.1 27.7 25.2.26.8 27 37.6 31.3 32.9 63.5 57.9 '59.8 5.6 28.4 24.3 27.0 28-6.8-6.6 39.4 31.5 33.0 61.5 57.7 60.0

-3.4 28.6 24.7 27.2 29

' 6.8-6.6 ' 41.2 31.1 33.4 64.9 56.8 58.6 5.4 27.2 23.8 25.2 30 6.9-6.8 35.4 30.4 32.2 59.9 56.5 57.5 3.1 27.4 23.9 25.4 31 6.9-6.8 39.2 30.9 32.9 64.2 E6.1 57.8 5.9 28.1 19.1 25.0 MONTH 6.9-6.6 43.0.30.4 34.1 66.2 55.0 59.9 6.3 28.8 18.7 25.9 PH RANGE = HIGHEST AfD LOWEST PH AT DISCHARGE CANAL (PH UNITS)

'ALL TEMPERATURES ARE IN PEGREES FAHRENHEIT MRC u MAXIMUN RATE OF CHANGE IN DISCHARGE TEMPERATURE (DEGREES / HR. )

- - - NEANS LACK OF DATA FRON CCHTINUOUS MONITORING SrSTEM DUE TD SENSOR MALFUNCTI0ta (REQ'JIRED GRAB SAMPLE DATA HAVE EEEN TAKEHI

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CONNECTICUT YANKEE STATION NONTHLY-H4TER CUALITY DATA

SUMMARY

DATA FERIOD lt. 1.FES 80/0015

-~.29 FES 80/0315 i

' PARAMETER

DAY PH RANGE' INTAKE TEMPERATURE DISCHARGE TENFERATURE TEMPERATURE RISE'

' MAX.

MIN. ~ AVE.

MAX. HIN. ' AVE.

MRC

MAY, HIN.

AVE.

1.

'6.9-6.8

,34.7130.4 ' 32.1 "

159.0 55.6 57.0 21.6' 07.2 21.2 24,9-2?

6.95 6.8 ' 32.5 30.9 131.7-57.7J56.1 56.8=

0.5-26.8 24.3 25.1 3

.6.9-6.8 x34.5 30.6 32.2' 51.2 $6.3 c57.5

-1.4

.26.1.

23.8.25.3

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! 6.9-6.8 37.41. 31.1L ~ 30.81 60.4 :56.5 ;57.9 4' 0 26.6 22.5' 25.0 59.7 ' 56.3: '57.9.

.9 06.8.23.8 25.3

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'6.91 6.8 f35.y. 31.11 32.6--

6s 6.9-6.8 39.4 E31.8 x33.1

- 63.7. 54.3 57. 7.

-4.7.

27.0 20.2 ~24.5 7

.6.9a 6.8 40.3-L30.4.33.0 64.2 '55.0.57.7

-4.1

-26.6 19.8 24.7 8'

6.9-6.8' 35.2 31.1 32.8

-60.1 '55.9 57.6 :-2.5.

27.9 21.2 24.8 9'

--6.9-.6.8 36.5 31.5 33.0 59.0.56.3L 57.9.

2.0 26.8'.22.7 24.7

' 10 6.9-6.8 42.11 31.1--33.8

65.31 56.8 58.7 5.6-

.26.6 20.3 :24.8 11'

~ 6 9-6.8 41.0^ 31.1-.34.4 65.31 56.8.59.1

7. 9. 28.1: 20.7' 24.7 12-l6.9-6.8 42.1 -~32.0 34.0-L 64.6 ' 57.2 58.9 - 6.8 26.1 '21.4 24.9 l

2 13 l 6.9. 6.8

42.4 32.2n 33.8 64.6 =57.0.-59.0' 7.0 30.1 21.6 25.1

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14, 6.96.8 41.0 '32.2 34.3 65.1 57.4-59.31 '5.9 20.7 '05.0

.27.4 27.0' 22.9 24.4 15 6.9-6.8',40.8 J32.7 35.5~

> 65.3. 57.4 159.8 5.4

'40.8'32.7 36.1 63.5 57.7 60.9 4.5'.28.8. 21.1 24.9

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16' 6.9-6.8 17 ~

6.9-6.8 40.3 31.8 L34.1-

67.3 L57.0 '62.2

-5.2 30.8 22.3 28.1 18

- 6.9-6.8

.42.6

'31.5' 34.4 68.0 61.0 63.0 - 5.4 '. 31. 0 20.2 28.6 19 6.9+ 6.6~.42.4.32.0 34.8'

. 71.2. 55.6, 63.7 -10.1

-35.6 18.5 28.8 35.9L 72.7 52.9 64.2

-7.0 33.5 17.3 28.3 20'

' 7. 0 -- 6. 8 ' 42.4 32.7 '.35.2l 62.6 46.9.54.3

-7.6 LOS.1 11.7-19.0 21:

~7.0- 6.8

'40.6 ~33.6

'22 17.0

'6.8-40.8 ~ 33.8 "36.4 J 63.7. 54.5 " 59.9 c 5. 0 ~ PA.1 16.6 23.5 23 7.0-16.8 - 41.0 32.9 35.5 63.7 57.4 -59.7 4.0 25.9 18.7 24.2 l

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6.9.6.8-41.9 '34.0.

37.3 65.3.59.5 -61.5 5.6 26.1 20.0 24.1 25~

6.9a 6.8 143.3 135.4 '3S.4-

'66.2.

59.5' 62.5 6.7 "6.3 '22.1 24.1

~26

-.7.0- 6.8 43.0 -3e.5 37.0'.

'66.2.58 S ?61.2 3.8 26.1 19.4 '24.2-4: F 7.0- 6.8

.43.5

33. 4.: ~ 37.0 65.1 58.31,60.9 6.3 2%.7 19.8 -23.9 08 7.0- 6.840.6 c34.0 35.9.

64.4 58.8. 60.2 3.1 25.4 18.7 24.3 29.

7.0--6.9 39.4 ~31.8 ^34.5.

63.5 57.0- 59.4' -2.5 26.11 02.7 25.0

. MONTHi 7.0 6.6.

43.5 130.4 34.6

.72.7 46.9 59.5'-10.1-35.6

.11.7-25.0 i

~ PH RANGE m. HIGHEST AND LO*4!ST PH AT DISCH ARGE CANAL (PH UNITS 3

. ALL TEHFERATUFES APE IN DEGREES FAHRENHEIT k

MRC s MAXIMUM RATE 07.OlfAN3E'IH DISCHARGE TEMPERATURE EDEGREES / HR.)

1. 1. 1. NEANS LACK OF DATA FROM CONTINUCUS MONITORING SYSTEM DUE TO SENSOR.NALFUNCTION EREQUIRED GRAB SAMPLE DATA HAVE EEEN TAKENI r

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CONNECTICUT YANKEE STATICN t*,OtlTHLY WATER QUALITY CATA

SUMMARY

DATA PERIOD s 1 MAR 80/0015

'31 MAR 80/2315 PARAMETER

' DAY'

'PH RANGE-INTAKE TEMPERATURE ' DISCHARGE. TEMPERATURE TEMPERATURE RISE-MAX. MIN.

AVE.

MAX.

MIN.

AVE.

MRC MAX.

MIN.

AVE.

,1-7.0- 6.9" 37.0 31.5 '33.0 59.7 56.5 58.0 2.3

26.3 21.8 25.0 2-

"7.0- 6.9 38.6 31.1 33.4

'64.4 56.5 59.4 4.9 28.1 22.1 ~25.0

'3 17.0- 4.9 41.0 31.8 34.6 62.8 56.5 5S.8; '4.7 25.7 19.6' 24.2 4

7.0- 6.9 42.1 32.0L 35.1 64.6 57.0 59.4 5.6 26.5 20.5-24.3 5

7.0- 6.9 40.8 32.9 35.5 64.4. 57.9 '60.1 5.0-26.3 19.3 24.5 6

7. 0- 6. 9 41.0 -33.4 35.3.

64.9 58.1 59.7 5.4 25.6 18.9 24.4 7-7,0- 6.9 41.5 32.9. 36.0 66.0.58.3 60.9 6.1 26.8 22.9 24.9 8

7.0- 6. 9 42.8 34.7 37.2 65.5 60.1 61.8 4.7 26.6 22.1 24.6 9

6.9-6.8

~42.8 - 35.6 37.6

'64.6 60.4 62.2 2.9 26.1 20.7 24.7 10 6.9-~6.8 45.7 36.5 39.6 6S.2 61.0 64.1 3.4 26.1 22.0 24.5 11 7.0- 7.0

'40.1 -38.3 39.4 64.9 63.7 64.6

-0.7 25.9 24.3 25.2 12

- - - -****. 40.1 37.2 38.5-64.2 '64.0 64.1 0.2 26.1 23.9 25.3

,13.

- - - -****- 40.1 35.2 36.6-63.3 60.6 '62.1 0.7 26.6 24.5 25.7 14 6.6-6.6 43.0- 34.0 36.4

.66.0 58.3 60.9.'-1.8 25.2 23.4 24.4 15 '

6.3-6.6 35.2 34.0 34.7 61.3 55.6 60.1

-0.5 26.5 23.9 25.4

' 16 '

6.8.6.6 42.4 34.0- 36.0 65.5 59.5 61.6 4.5 26.6 23.0 25.6

.17

-6.8-6.6' 44.4 35.4 39.2 67.8 61.3 64.0 5.6 26.3 22.0 24.8 18

.-6.8-6.6 43.7 37.9 39.6 68.7 62.8 64.4

-2.9 25.9 23.2-. 24.8, 19.

6.8-6.6 41.0 35.8 39.9 66.0 ~63.3 65.1 0.9.

25.9 23.9 25.1 20 '

6.6-6.5 40.6 38.5' 39.1-64.4 63.1 64.0' -0.7 25.9 23.6 24.9 21-~

6.6-6.5 40/1 38.1' 39.0 64.4' 62.8 63.8

-0.5 26.1 23.9 24.8 22 6.6-6.5 39.7 37.4 38.9 64.0 61.5 62.7

-0.7 25.21 23.0 23.8 6.5-6.3 33.3 36.1 36.8 61.5 60.1 60.9 0.5 25.2 22.7 24.2 24 6.3-6.1

'39.5' -36.1 37.2 64.0 60.8 61.5

-2.5 26.1 22.9 24.3 25'

~ 6. 3-6. 3 33.8-37.4 35.1 63.1 61.5 62.2 0.5 25.2 23.2 24.2 26 6.4-6. 3 39.4 ~37.4' 38.5 64.4 61.7 62.9

-1.4 25.9 23.2 24.5 27 6.4-6. 3 39.4 37.9 38.6 63.3 39.7 54.2 -19.8 25.2 0.9 15.6

' 28 -

6.5-6.4 40.1 38.1 39.0 57.7 39.4.48.5 6.8

.18.5 0.5 9.4 29 6.5-6.3 41.2. 39.0 39.9 64.4 47.8 60.5

-9.4 23.9-8.8 20.6 30 6.4

.6.4 41.5 39.7 40.6 64.4 63.1 63.8

-0.5-23.9 22.1 23.2 40.3 63.5 62.6 63.2

-0.4 24.3 20.9 22.9 31

.'6.5

.6.4 42.4l38.5 '

MONTH 7.0- 6.1 45.7 '31.1' 37.5 68.7 39.4 61.2 -19.8.

28.1 0.5 23.7

' PH RANGE a HIGHEST AND LOWEST Rt AT DISCHARGE CANAL (PH UNITS)

ALL TEMPERATU?ES ARE IN DEGREES FAHRENHEIT MRC a MAXIlfJM P ATE OF CHANSE IN DISCHARGE TEMPERATURE (DECREE 5 / HR. )

- - - MEANS LACK OF DATA FROM CONTINUQUS MONITCRING StSTEM CUE TO SENSOR MALFUNCTION (REQUIRED GRAD SAMPLE DATA HAVE BEEN TAKENI 1.

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TA3LE 2.1 (COMT.3 CONNECTICUT YANKEE STATIC'i NONTHLY NATER QUALITY D AT A SUt01ARY

' DATA PERIDO s il MAY 80/0015' - 31 NAY 80/2315

~

PARAMETER' DAY PH RANGE IHTAKE TEMPERATURE DISCHARGE TEMPERATURE TEMPERATURE RISE NAX.

f11H. AVE.

NAX.

NIN.

AVE.

MRC MAX.

MIN.

AVE.

1' 6.5-6.4 51.4.49.3 50.2 70.5 69.4 69.8

-0.4 20.9 18.4 19.6

~ 50.5 71.2 69.1 70.2

-0.4' 20.7 18.9 19.7 2*

6.5-6.4 51.8 -49.6 3

6.6-6.4 54.3 50.0 52.1 70.5 52.7 57.5

-5.4.

-19.6 0.2 5.4 4.

.6.6-6.5 55.9 52.9. 54.6 56.3 54.1. 55.2

-0.4 1.3 0.4 0.6 5

8.5.6.5 57.4 55.0-J56.1 57.9 55.9 56.8 0.9 1.3 0.2 0.7 6

6'.5-6.5 58.6 56.8 57.5

'59.0 57.7 58.4 0.4

'1.6 0.0 0.9 7

6.5-.6.5 60.1 57.9 58.5 59.9 59.0 59.4 0.4 1.6 0.0 0.9 8

6.5-6.5. :59.5 57.7 58.4 59.5 58.6 59.0

-0.4 0.9 0.0 0.6 9

16.5-6.5 57.4 '56.8 57.2 59.0 57.9 58.2

-0.2

.1.8 0.5 0.9 10

-6.8-6.4 57.4 55.9 '56.7 57.9 56.5 57.4

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-13 16.8-6.8 58.1 56.8 57.8 58.8 57.4 E8.4

-0.4-1.1 0.0 0.7 14 7.0- 6.6 60.1 '57.4 58.7 60.4 58.1 43.3' O.5 '

1.3-0.0 0.7 15 :

6. 8-6.6 -

59.5 58.1 58.9 60.4 59.2 b9.6 0.5 1.3 0.4 0.7 l

16' 6.8-6.6 60.1 59.5 59.8

-60.6 60.1' 60.5 0.4 0.9 0.5 0.6 17-6.9-6.6

-62.8 58.8 60.0-62.6. 59.5 60.5

-1.1' 2.0 0.0 0.6 18 6.8-6.6.

61.0.59.5 60.3 61.3 59.9 60.8

-0.5-1.3 0.0 0.5 l

19 6.9-6.5 62.8 59.2 61.0 63.1 59.7 61.5 0.7 1.1 0.0 0.5 l

. 20 '

6.8-6.5 62.8 61.0 61.6 63.3 61.5 ~62.2 0.5 0.9-0.2 0.5 I

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22 6.9-6.6 63.5 63.1 63.4 67.8 64.4 66.4 1.6 4.3

-0.9-3.0 23

. 7.4-6.5 ' ~ 65.1. 62.4 63.6 69.6 64.9 66.5

-3.2 4.5 0.2 2.8 24

'7.0- 6.6 66.4 64.4.65.8 67.3 64.6 66.2.

0.5 1.1 0.0 0.4 25 7.3-6.6 67.8 64.9 66.7 68.5 65.3 67.1

-0.5 1.3 0.0 0.4 26 7.8-6.8 67.8 65.3 66.6 67.8 65.8 66.9

-0.5 0.9 0.0 0.3 27 8.3-7.1 67.1 65.5 66.4 67.8 66.0 66.7

-0.5 1.1 0.0 0.3 to 8.6-7.3-68.5 65.5 67.1 63.5 65.5 67.2 0.7 0.5 0.0 0.1 29 8.5-7.4 69.1.66.4 67.6

'69.1 67.1 67.8

-0.7 0.9 0.0 0.2 j

10 8.8-7.3 70.0 67.1 '68.1 70.0 67.1 68.4 0.5 0.9 0.0 0.3 31 8.5-'7.4 69.8 67.6 68.7 70.0 67.8 68.9 0.7 0.7 0.0 0.2 NONTH 8.8-6.4 70.0 49.3. 60.9 71.2 '52.7 63.4

-5.4 20.9 0.0 2.5 PH RAtGE a HIGHEST At.V LOWEST PH AT DISCHARGE cat 4AL (PH t?llTSI

' ALL TENFERATUDES ARE IH DEGREES FAHREtMEIT MRC

NAXIMUM RATE OF CHAN0E IN DISCHARGE TEMPE3ATURE (DECREES / HR.)

- me NEAf 43 LAEK OF DATA PR0t1 CONTINUQUS NONITO' TING 5) STEN CUE TO SENSOR NALFUNCTION tRECUIDED GRA8 SANPLE DATA HAVE BEEN TAKEN) _

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6 3

TA2LE 2.1 (CC'!T.I CCNNECTICUT YANKEE STATICM MCMTHLY WiTER CUALITY OATA SUM *1ARY 31 JUL 80/2315 DATA FERIOD = 1 JUL 80/0015 PARAMETER

- DAY rN PANGE INTAKE TEMPERATURE DISCHARGE TEMPERATURE TEMPERATURE PISE MAX. MIN. AVE.

MAX. MIN. AVE.

MRC MAX.

MIN.

AVE.

1 7.0- 6.6 2

7.9-6.8 3

7.0- 6.8

- - - - ***** ***** ***** ***** ***** *++++

~ 4 7.8-6.6 ***** ***** *****

5 8.3-6.9

- - - - ***** ***** ***aa 6

8.3-7.0 7

8.6-7.1 8

8.4-7.4 '***** ***** *****

9 8.0- 7.1 10 8.0- 7.0 11' 7.8-7.1 12 8.0- 7.0 ***** ***** *****

13 8.0- 7.1 ***** ***** *****

14 7.8-7.0 15 7.4-7.0 16 7.4-7.0 17 7.3-6.9 l'

7.1-6.9 82.4 81.1 81.8 19 82.6 79.9 81.4 20 21 85.3 82.2 83.6 22 23 84.7 63.5 84.0 24 83.8 81.5 82.8 25 83.3 81.7 82.4 26 83.3 81.5 82.5 27 82.9 81.5 E2.4' 91.4 84.7 90.2 3.2 9.2 2.7 7.6 28 8.6-8.6 83.1 81.7 82.2 82.4 E2.4 82.4 *****

0.4 0.4 0.4 29 8.6-8.0 82.0 82.0 82.0 82.4 82.4 E2.4 *****

0.4 0.4 0.4 33 7.5-7.5 82.0 82.0 82.0 82.4 82.4 e2.4 *****

3.4 0.4 0.4 31 7.9-7.9 82.0 82.0 82.0 82.4 82.4 82.4 *****

0.4 0.4 0.4 MCNTH 8.6-6.6 85.3 79.9 E2.3 91.4 82.4 83.t 3.2 9.2 0.4 1.5 FH RANGE

HIGHEST AND LCMEST PH AT DISCHARGE CANAL (PH UNITS)

ALL TEMFERATURES ARE IN DEGREES FAHRENHEIT MRC = MAXIMUM RATE CF CHAIGE IN DISCHARGE TEMFERATURE (DEOREES / HR. )

- - - MEANS LACK CF CATA FRCM CCNTINUCUS McNITORItG SYSTEM DUE TO SENSCR MALFUNCTICM (REQUIRED GRAS SAMPLE DATA HAVE BEEN TAFEm g

a TABLt 2.1 tCCNT.)

CONNECTICUT YANKEE STATIC'4 MONTHLY WATER QUALITY DATA

SUMMARY

DATA PERIO3

1 AUG 80/0015 - 31 AUG 80/0315 PARAMETER DAY PH RANGC INTAKE TEMPERATURE DISCH ARGE TEMPERATURE TEMPERATURE RISE MAX.

MIN.

AVE.

MAX.

NIN.

AVE.

FFC MAX.

MIN.

AVE.

1 7.9-7.9 82.0 82.0 82.0 82.4 82.4 82.4 *****

0.4 0.4 0.4 2

7.9 7.9 22.0 82.0 82.0 82.4 80.4 82.4 *****

0.4 0.4 0.4 3

7.9-7.9 82.0 82.0 82.0 e2.4 82.4 82.4 *****

0.4 0.4 0.4 4

7.6-7.6 22.0 82.0 82.1 82.4 82.4 82.4 *****

0.4 0.4 0.4 5

7.9-7.9 82.0 82.0 82.0 82.4 80.4 82.4 *****

0.4 0.4 0.4 6

7.8-7.8 84.0 64.0 75.9 89.6 82.4 83.7 3.1 5.6 0.0 1.1 7

7.7-7.7 84.0 64.4 75.7 105.1 91.0 97.5 2.7 21.1 8.1 14.7 8

7.9-7.9 86.0 65.3 77.3 108.0 106.0 107.1 1.1 24.1 22.0 23.1 9

- ne.**e*

86.0 65.3 77.7 108.9 106.3 107.6 0.9 04.1 22.0 23.0 10 86.0 e4.6 77.7 109.4 106.0 108.1 2.0 24.1 22.0 23.4 11 8.0- 8.0 86.0 63.5 77.3 109.4 105.6 107.9 1.4 25.0 02.0 23.2 12 8.3-8.3 85.5 62.8 76.6 10$.0 105.1 107.0 2.0 23.9 21.1 22.9 13 8.4-8.4 84.9 62.6 75.6 107.6 104.0 105.9 2.0 24.1 22.5 23.4 14 8.1-8.1 82.9 61.0 74.5 106.0 102.9 104.9 2.7 24.7 22.9 23.2 15 8.3-8.3 82.0 61.0 73.6 104.4 100.0 102.8 1.4 23.0 22.0 22.4 16 81.0 58.6 72.2 104.7 100.9 102.4 2.3 23.9 22.3 23.2 17 79.0 59.2 71.1 102.2 99.0 100.7 3.2 24.1 22.9 23.5 18 8.5-8.5 79.0 59.9 71.7 102.0 100.0 100.8

-1.1 24.1 22.9 23.0 19 8.1-8.1 79.0 75.9 77.5 101.8 99.0 100.9 2.5 04.1 :

.9 23.4 00 7.6-7.6 78.1 58.1 70.3 101.3 99.5 100.4 1.4 24.1 22.9 23.6 21 7.7-7.7 77.0 75.0 76.1 100.0 98.1 99.3

-1.1 24.1 23.0 23.2 22 7.3-7.3 77.0 56.5 68.7 100.0 97.0 98.4 1.1 24.1 22.7 23.3 23

- - - -s***

75.a 56.3 68.8 100.0 96.6 98.5 2.0 24.1 22.7 23.3 24 79.1 56.8 69.4 100.9 97.0 99.3 2.0 24.1 20.9 23.3 25 79.C 57.0 71.4 100.4 97.0 100.2 2.0 25.0 22.9 23.6 26 7.9-7.9 E0.1 74.8 77.7 102.9 97.9 100.8

-1.1 24.1 22.9 23.1 27 8.0- 8.0 81.0 75.9 78.4 104.0 100.0 101.7

-0.0 24.1 02.9 03.3 28 7.7-7.7 81.0 78.1 79.4 104.0 101.5 102.8 1.1 4.3 22.0 23.4 29 7.8-7.8 81.0 59.9 73.5 104.0 102.2 103.2 1.8 04.3 22.9 23.7 30 81.0 78.1 79.2 104.0 101.5 102.8 2.3 24.5 23.2 23.6 31 80.1 78.1 79.0 104.0 101.3 102.8 0.0 04.5 22.9 23.8 MONTH 8.5-7.3 86.0 So.3 75.8 109.4 82.4 97.2 3.2 25.0 0.0 17.0 FH RANGE = HIGHEST AND LCWEST PH AT DISCH ARGE C ANAL ( FH UNITS)

ALL TEMPERATUDES ARE IN DEGREES FAHREtMEIT MAXIMUM RATE CF CHANGE IN DISCHARGE TEMFERATURE IDEGRTES / HR.)

MRC 6 c'** ME ANS LACK OF D ATA FROM CCNTINUOUS MOttITOPING SYSTEt1 DUE TO SENSOR MALFUNCTION (REQUIRED GRAB SAMPLE D AT A H AVE BEEN T AF ENI 1 1

~ A' f

TABLE 2.1 (CCNT.)

CCt1NECTICUT YANKEE STATION MONTHLY WATER QUALITY DATA

SUMMARY

DATA PERIOD = 1'SEP 80/0015 - 30 SEP 80/2315

-PARAMETER DAY PH RANGE: INTAKE TEMPERATURE DISCHARGE TEMPERATURE TEMPEPATURE RISE MAX. MIN.

AVE.

- MAX. MItl. AVE.

MFC.

MAX. MIN.

SVE.

~

1 84.2 81.5 82.7 105.8 104.9 105.4

-0.9 23.4 21.6 22.7

~2 8.5-8.0 85.8 80.2 81.8 109.0 104.2 105.4 1.1 24.1 22.7 23.6 3

8.6-7.5 83.1 8Q.4-81.7 106.2 103.6 105.0 1.6 23.8 22.5 23.0 4

.82.6 79.0 '80.5 106.0 103.1 104.0 2.9 24.3 22.5 23.5 5

82 77.9 ~79.6 104.4 102.0 103.0

-1.3 24.1 22.0 23.4 6

83.8 77.5.79.3 103.3 102.0 102.8 1.3-24.5 22.3 23.6 7-81.1 77.2.78.9 104.0 100.6 102.1 2.2 25.0 21.1 23.1 8:

80.6 75.4 78.1

.103.6 100.0 101.9 1.6 25.9 -22.5 23.7 9

79.5 '74.3 77.1 103.8 101.3 102.1 1.3 27.0 23.4 25.0 10 8.1-7.6' 77.9 74.8 76.4.

101.1 96.6 99.3 2.3 23.8 18.9 22.8-11-7.9-7.5 77.7 73.2 75.9 101.8 97.3 99.2 1.8 24.3 22.3 23.4

.1?

7.9-7.5 78.8 74.1 '76.0 101.1 97.7 99.2 1.6 24.5 21.6 23.2 13 7.9-7.4 79.3 73.2-7625 102.0 97.5 99.6 2.3-25.0 21.6 23.1 14-

=7.5-7.4 79.3 73.9 7G.8 192.7 97.3 100.2 2.7 24.8 22.0 23.5 15 7.5-7.3-79.0 73.2 J76.0 101.3 96.8 99.2-2.3 25.0 20.0 23.2 16 7.6-7.3 77.7 72.1 74.7 100.2 95.9 97.8 1.8 24.5 21.8 23.1 17 7.5-7.3 76.1 71.2 73.5 98.8 95.2 96.8 2.9 24.7 20.9 23.2 IS' 7.5-7.3

.75.4 69.4 71.9 98.6 95.2 96.4 3.4 27.0 22.1 23.8

'19 7.5-7.1 73.0 '69.4 77.2 95.9.93.7 94.7 1.3 24.5 22.1 23.6-20 7.5-7.1 73.2 69.1 70.7 96.1 92.8 94.5 1.8 24.7 22.5 23.8 21-7.5-1.1

'74.5 : 69.6 71.7 97.7 93.4 95.4 1.6 25.2 22.3 23.7 22 7.5-7.3 76.3 70.5 73.1 99.7 94.8 97.2 2.3 25.4 22.5 24.0 23 7.C. 7.3 76.6 71.2 73.5 100.4 95.9 97 7 1.8

.25.6 23.0 24.1 24

'7.6-7.3 73.9 69.4' 71.8 -

97.9.94.3 96.3 1.5 25.7 23.0 24.2 25' 7.5-7.3 73.0 69.6 -70.7 96.1 C4.8 95.3

-1.3 25.6 22.9 24.6 26 7.5-7.1 74.8 68.0 70.8 96.8 eo.7 94.9

-4.5 25.9 20.7 24.1 27 8.1-7.4 67.6 64.o 66.2 63.3 66.4 69.7 - 5. 4 - 16.0 0.9-3.5 28 8.1-7.5 66.7 64.2 65.3 67.1 65.5 66.4

-1.3 2.3 0.4 1.1 29 8.5-7.4 67.3 64.2 65.1 71.6 65.1 66.9 2.5 7.0 0.4 1.8 30 8.4-7.5 67.1.-63.5 65.2 86.5 72.1 77.2 - 3. 2 21.2 7.4 12.0 MONTH 8.6-7.1

.85.8 63.5 73.8 109.0 65.1 94.3

-5.4 27.0 0.4 20.6 FH RANGE,: HIGHEST AND LCWEST FH AT DISCH ARGE CAHAL ( PH UNITS)

ALL TEMFERATUCES ADE IN CEGREES FAHREt1HEIT MAC z MAXIMUM CATE OF CHAT 1GE IN DISCHARGE TEMPERATURE (DEGr.EES / HR. )

me MIAf45 LACK OF DATA FRC'1 CCNTit;UCUS MCt1ITORING SYS;EM DUE TO SENSOR NALFUt:CTICH (REQUIRED GRAB SAMPLE DATA HAVE BEEN TAKEN) r 1

E,_

.s' J...

. e.

s TA8LE 2.1 (CONT.)-

4 CCHNECTICUT YANKEE STATIO4 N0f 3fHLY.blATER QUALITY DATA SU'1 NARY :

DATA' PERIOD'sl 1 OCT 80/0015' -

31' OCT 80/ 315

. PAR '. NET ER HAY PH PANGE. INTAKE TEMPENATURE DISCHARGE TEMPERATURE.. TEMPERATURE RI$E-NAX.. MIN.. AVE.

- NAX. NIN. AVE.

. MRC MAX. NIN. AVE.

1

'7.9-7.5 67.6. 6414: 65.7 90.3 87.1. 88.7' ' 1.6 24.3

1.8-23.0 0-8.1-7.5 : L48.7 '65.5 67.1 91.4 89.2. 90.2 2.2 :29.1 22.3 23.1 3'

7.5-7.3 67.6 64.9-66.3' 90.3 88.0 89.3-.l.4 2 3.9 ' :.1 23.1

. 4 :.,

7.4.7.3D : 6 9.1 6 4. 9 x 66.8 91.6 88.5 89.9 1.8.

4.3 l 1.6

3.1.

7.4-7.1 ; ~68.0 65.3 66.4

' 90.7 8S.3 89.6' 1.6 23.9

1.6 23.2 61 27.4-7.1

' 66.9. l 63.7 E 65.4 -

89.6 87.1 t o '.6 2.3-24.1 : 1.8 23.2 7-47.4-7.3' 66.9 63.3 64.8 89.2 C6.7 87.8 11.S' 3.8f 2.1; 23.1 4-8 7.5-7.1 - 67.1 '62.2 63.6 48.5 85.3 e6.9 1.8 03.9

1.4 23.3-9 7.5-17.1

. 64.6' 61.3.62.7 87.4 84.9 85.9 1.8 24.1 21.4 23.1

~ 10 '

7.8-7.1'

'64.4 60.6 62.4 87.1 83.8 85.6 0.5.

4.1' 21.2-23.2

)~

11 7.3-7.1

'64.9 60.4 62.24 87.6 84.2 85.8 2.3.

24.3-22.7 23.5

'12

' 7.1-7. 0 ' '64.2 -59.5 61.6 86.7 83.5. 85.1 1.4 24.3 22.8 R 3. 5 13 7.1-7.0 63.1 57.9 59.9-

- 86.0 82.2 83.5 1.8 24.3 21.6. 23.6

~ 14 -

7.3-7.0' 60.1-57.4 '58.71 84.0 l81.5 82.5 1.4 24.5 22.5 23.8 15 7.3-7.0 61.7 -57.2 59.0 85.1. 81.1 l82.7 0.7 24.5 22.5 -23.8 16

'7.47.0 63.1 E,.7.59.3.

' 86.0 81.3 83.1 - 3.6

4.7 ~ 22.9 23.8 164.4' 57.9 60.0' 86.9c 81.7 83.8 3.6 24.7 21.6 23.7 17.

7.4-7.0*

' is' 7.3 '7.0 63.3 57.2 59.7 86.0 61.7

'83.7.

2.5 26.1 21.6 ' 4.0 19

7.1 7.0 ~~63.3 57.7 '59.9' 86.0 80.2 83.8

2. 7 ~ ' 4.7 22.7 23.9 i

20 "7.3-7.0 64.0 59.0L t0.6 86.5 83.3' 84.6' 2.5 24.8, 22.5 ' 4.0 :

~

22l

.7.0- 6'.9

' 6: 4 '.57.9 59.6-

~86.5 84.0 84.8 2.f

5.2 22.9 24.1 21 7.1-7.0 62.6 59.2 60.7 86.0 62.6. 84'.0 2.fi n 25.2 22.7 24.4 3

,1..

23'

'7.0-L6.9' 59.7 55.4-57.6~

- 84.2 79.9 82.2 1.16 25.6 23.0 at:5

.7,0- 6.9 156.8' 54.1 -56.0 82.9 '78.8 80.7 2.3

25. 2. '.. 5 24.6 2,

25-7.0- 6.9

.59.0 53.8 55.9

. 82.6 78.4' 80. 3 _

.0 - 25.2

.3

4.4

' 26.

_ 7. 0- 6,9 57.7-50.7 52.5 79.5 e8.5 74.7

-5.it 24.5 15.1 ::.

27?

L7.0 6.9-54.7. 50.2 51.3J 78.1 ~74.3 75.S 2.E 24'.7. 23.4 24.1

7. 0- 6.9

.54.5 49.8.51.2.

77.7 74.3 75.3 2.4 24.7 ::.7 24.1

, 2rr 28-

-6.9* 6.9 50.5 49.3 49.8

~74.8. 73.0 74.1 1.3.

24.8. 23.

24.3 i

.3)-

6.9 :6.8 90.0 45.0 49.2 76.1 73.0 73.9 1.6 - :5.4

3.6 04.7 31 6.9 6.8 50.5 47.8'-'49.5 74.8 71.8 73.1

~2.3 25.4 22.9 24.6

. tt0t4TH 8.1-: 6.8 69.1 :47.3 5).3 71.?

68.5' 83.0

-5.2 26.1 15.1. 23.7 i'

I.

^rH PAtCE's HIGHEST'AM3 t0WIST PH AT DISCHARGE CANAL trH Uti!TS)

[

ALL' TEMPERATURES ARE IN DIG 4EES F AHRINHEIT NRC e NAXIttUN RATE CF CHANGE It1 DISCHARGE TIftPIRATURE (CEGREES / HR.I.

4 i s... NEANS LACK OF D ATA JRD*1 CONTIttVOUS Not41Tontt:0 51 STEN 00E TO SEtiSOR ttALFUNCT10?1 IREQUIRLD GR AS SAMPLE D ATA HAVE DIEN T Ak EHI

~

4..

I __

-. ~

~ _

- 6.

.y e

e

-TABLE 6.1-(CONT.)

s CotMECTICUT YANKEE STATICH MONTHLY WATER QUALITY DATA SUt'JtARY DATA PERIOD-* 1 NOV 80/0015 - 30 NOV 80/2315 PARAMETER t.-

DAT PH RANGT. -- INTAKE TEMPERATURE DISCHARGE TEMPERATURE TEMPERATURE RISE NAX. NIN. AVE.

MAX. NIN. AVE.

MRC MAX. MIN. AVE.

1-6.9-6.8 47.5 46.6 47.2 72.7 70.9 71.6

-1.1 25.6 23.8 24.4 -

2 6.9-6.8 51.6 45.5 47.4 75.0 69.4. 71.9 3.0 25.6 :.7 24.5

~

3

.6.9-6.8 52.5 46.0 48.7 76.3 70.9 73.1 3.6 25.4 22.5

.4 4'

6.9-6.8 52.3 46.2 49.0 79.3 71.2 73. 9. -5. 2 - 27.7 22.7 24.9 5

-6.8-6.3 52.5 46.0 48.2 76.3 70.9 73.3 2.7 26.1 23.0 25.1

'6

'6.8-6.8 51.1 45.3 47.5 75.2 70.9 72.8 3.6 - 26.1 22.5 25.3 7

6.8-6.6.

53.8 46.0 49.1-78.1' 72.1 74.3 2.7 26.3 22.0 25.2 8-6.8-6.6 52.9 46.9 49.0 77.2 73.0 74.7 2.0 26.6 23.6 25.7 9.

6.8-6.6 52.5' 45.5 47.8 77.0 71.6 73.7 3.4 27.0 23.8 25.9 10 6.8-6.6 50.0 45.5 46.8 -

75.2 71.8, 72.9.

1.8 27.0 24.1.26.1 11 6.8 6.6

-45.7 42.8 44.4

' 72.7 ' $7.3 69.5

-1.8 07.0 24.1 05.0 12 6.9-6.8, 46.0 41.9 43.2 68.5 66.4 67.2 0.9 24.8 22.3 24.0 13 6.8-6.6 45.7-41.0 42.3 69.1 65.1 66.3 1.4 24.5 22.9 24.0

- 14 6.9-6.6.

45.1 39.9 42.5 69.1 65.3 66.7

-2.5 25.9 22.5 24.2 15

-6.9-6.8' 46.9 41.7 43.1 70.7 ~66.0 67.2

-2.0 24.8 '22.7 24.1

-- 16 6.9-6.6 - 46.9 41.7 43.5' 70.0 66.2 67.7 2.2 25.2 22.3 24.2 17 6.9-6.6~

49.3 41.0 43.8-70.7 65.5'.67.8. 2.7 25.7 21.1 24.0 18 7.1-6.6 47.5 41.2 43.2 69.8 42.8 52.5 -21.1 24.5 1.1 9.3

- 19 7.0- 6.8 44.6 33.8 40.3 65.1 47.3 53.6 2.7 23.6 7.7 13.3 to 7.1.6.8 40.3 3S.1 38.9 63.1 39.2 44.0 -18.0 23.9 0.2 5.3 21 7.0- 6.9 41.7 37.6.38.9 49.6 39.2 42,5

-4.0 8.1 0.7 3.7 02 6.9-6.6

.45.3 33.1 39.1 64.2 43.4 59.4 2.9 23.8 8.6 20.3 23-6.9-6.5 46.4 35.1' 41.5 67.3 61.0 64.0 3.1 23.6 18.5 22.5

- 24 16,8-6.6-46.2 33.8 41.9 67.8 62.2 64.7 3.8 24.1 19.4 20.8 25 6.8-6.6 ~ 46.6 39.4 41.7 68.0 63.5 64.9 3.6 24.1 20.5 23.2 26 6.8-6.6

'41.0 39.4,40.0 64.4 63.3 63.6 0.5 24.3 ::.3 23.6 27 6.6-6.5 40.1 35.3 39.3 64.2 e2.4 63.1

-0.5 24.3 22.9 23.8 23' 6.8-6.4 45.5 35.1 43.0 68.7 61.5 63.5 5.0 24.8 20.5 23.5 29-

'6.8-6.6 33.1 37.2 37.7-61.9 61.0 61.6 0.4 24.7 23.2 03.9 30

'6.6-6.5-37.6 37.2 37.4 64.4 60.6 62.8 2.3 27.0 23.4 25.4 MONTH 7.1-6.4 53.8 37.2 43.4 79.3 39.2 65.5 -21.1 27.7 0.2 20.0 PH RANGE a HIGHEST AND LOWEST PH AT DISCHARGE CANAL (PH UNITS)

ALL TEMPERATURES ACE IN CEGREES FAHRENHEIT MRC = NAXIMUM PATE OF CHANGE IN DISCHARGE TEMPERATURE (DEGREES / HR.)

an** MEANS LACK OF DATA FRCM CCNTINUQUS HONITCRIN3 SISTEN DUE TO SENSOR MALFUNCTION (REQUIRED GRAB SAMPLE DATA HAVE 8EEN TAKENI e.

t; 4

TABLE 2.1 (CONT. )

CONNECTICUT YANKEE STATICH MONTHLY WATER QUALITY DATA

SUMMARY

31 DEC 80/2315 DATA PERIC3 : 1 DEC 60/0015 PARAMETER DAY PH RANGE -INTAr.E TEMPERATURE DISCHARGE TEMPERATURE TEMPERATURE RISE MAX. MIN.

AVE.

MAX.

MIN.

AVE.

MRC MAX. MIN.

AVE.

'l 6.6-6.6 37.6 37.C 37.4 64.4 63.5 63.9

-0.7 27.0 26.1 26.5 2

6.6-6.6' 38.5 '37.2 37.8 24.0 60.6 61.8

-1.6 26.8 22.7 23.9

>3 6.6-6.6

-33.8 37.0 3S.0 62.4. 60.6 61.6

-0.5 24.1 22.5 23.5 4

6.8-6.6-37.0 34.9 36.1 61.9 59.5 60.5

-0.4 25.0 22.7 24.3 5

6.8-6.6 35.2 33.4 34.0 61.7 56.8 57.9 - 4.0

~27.7 23.2 23.9 6

6.8-6.6-33.6 32.7 33.3 57.4 56.3 57.1

-0.2 24.1 23.2 23.7 7

6.6-6.6 34.0 32.9 33.5 57.9 56.5 F ?.2

-0.5 24.5 22.9. 23.7 8

6.6-6.3

-41.7 30.4 35.1 64.9 57.2 59.1 5.9 27.4 18.9 24.0 9

6.8-6.4.

37.0 35.2 36.2 62.4 59.0 59.9

-3.4 26.1 20.2 23.6 10 6.8-6.3 39.9 36.1 37.0 64.0 59.7 60.7

-4.0 25.0 22.7 23.8 11 6.6-6.5

~37.4 35.2 36.1 61.0 59.0 59.8 1.1-24.3 22.9 23.7 4

12 6.8-6.5 37.0 34.5 35.4 59.9 53.8 58.8

-4.9 24.1 19.3.23.4 13

~ 7.0- 6.5 35.4 34.0 34.7 57.7 36.3 45.8

-5.8 23.8 1.1 11.1 14 -

.6.6-6.4 34.5 32.9 33.9 59.5 56.1 57.2 2.5 26.5 22.5 23.4 LIS 6.6-6.5-42.6 32.7 34.7 65.3 58.3 60.3 4.1 26.8 20.5 25.6 16 _

- 6.6-6.4 42.6 32.2 35.2 66.7 58.6 60.8 5.9 28.8 19.6 15.6 17 6.6-6.3 41.7 32.2 33.8 66.2 57.4 59.3 4.7 27.4 21.2 25.5 18' 6.6-6.3 36.1 31.8 32.7 64.9 57.4 58.9

-3.4 28.8' 25.2 26.2 19 6.6-6.4 41.2 32.2 33.4 65.1 58.1 59.3

-4.7 29.9 19.3 25.9 4

20 6.5-6.5.

37.9 32.0 32.6 61.0 57.9 59.1 2.0 28.1 21.1 26.6 21 6.5-6.5 35.1.32.0 32.7 62.1 57.9 59.6 2.0 2S.1 25.9.26.9

' 22 -

6,5-6.1-41.5 32.2 33.7 65.5 58.6 60.1

-5.0 27.0 - 22.9 26.3 23 6.6-6.3 42.8 32.2 34.0 66.7 58.3 60.4 7.9 23.8 23.4 26.4 24 6.5-6.3 41.0' 32.5 33.9 66.0 58.3 60.2 7.0 29.0 24.1 "6.3 25 6.5-6.4 32.2' 32.0 32.0 60.1 57.4 58.6 1.4 '

28.1 "5.4 26.5 26

- 6.5-6.4 33.4 32.0 32.1 60.1 57.9 53.8

-1.1 28.1 25.9 26.7 27 6.5-6.4 32.5 32.2 32.3 59.5 57.9 SS.6

-0.5 27.0 25.6 26.3 28 6.5-6.4 33.1 32.0 32.5 59.7 57.9 53.8

-1.1 27.2 25.2 26.2 29 6.5-6.4 36.3 32.2 33.7 62.2 58.6 o0.2 2.7 27.4 25.0 26.6 30 6.5-6.4 38.8 33.1 34.3 65.1 59.0 '60.6 3.4 28.8 22.9 26.3 31 6.5-6.4 33.8 32.0 32.7 59.9 57.4 SS.6 2.5 26.5 25.2 26.0 MONTH 7.0- 6.1 42.8 30.4 34.3 66.7 36.3 59.0 7.9 29.9 1.1 24.7 4

PH RANGE = HIGHEST AND LCWEST PH AT DISCHARGE CANAL (PH UNITSI ALL TEMPERATURES ARE IN DEGREES FAHRENHEIT MRC's MAX 1 MUM RATE OF CHANGE IN DISCHAPGE TEMPERATURE E DEGREES / HR. I

- - - MEANS LACK OF DATA FRCM CONTINUOUS MONITORIN3 SYSTEM CUE TO SENSOR MALFUNCTION (REQUIRED GRAB SAMPLE DATA HAVE BEEN TAKENI

~ 4

3.0 ENVIRONMENTAL SURVEILLANCE 3.1.1 Fish Impingement Once each week, fish washed from the traveling screens and collected in trash baskets over s 24-hour period were identified, counted, and separated into three lengt.h categorie0 (< 3",

3"-6", > 6").

The number impinged per month was e.stimated by averaging the weekly counts in -gny one month and multiplying the average by the nunaber of" days in the scath. The estimates are presented in Table 3.1.

Environmental Tachnical Specifications Section 3.1.1 Fish Impingement: Reporting Requirements, which specified reporting of overruns was deleted as of March,1979.

3.1.2 Meteorological Monitoring As required in the_ technical specifications, a meteorological monitoring system conforming to the specification of Regulatory Guide 1.23 and including a dewpoint monitor is maintained at Connecticut Yankee. Summaries of the meteorological data are available upon request of the NRC.

-( %i s

a

-:7-

e e

Table 3.1 CJ:NECTICUT YANKEE IMPINGEMENT ESTIMATES DLTRING 1980 January February March April May June July August Ivpinged Species

<3" 3"-6" >6"

< 3 " 3 " -6 " > 6 "

<3" 3"-6" >6"

< 3 " 3 "-6 " > 6"

< 3" 3 "-6" > 6"

< 3" 3"-6" >6"

<3" 3"-6" 36"

<3" 3"-6" >6" 6

Alewife American Eel 12 7

7 8

6 23 American Shad Black Crappie 12 46 8

' Bluegill 7

263 53 99 8

Brown Bullhead 16 8

6 8

Carp Darters 6

53 8

Freshwater Killifish 16 Clut Herring Golden Shiner 25 12 16 8

Hogchoker 8

31 Lamprey Eel 6

4867.

L.rgemouth Bass longear Sunfish 16 8

6 Northern Pike 6

Pickerel 22 Pumpkinseed 6

7 8

19 6 6

Silverside smelt 23 Spottail Shiner 12 2320 46 305 116 194 23 128 Striped Killifish Sucker Three-spined Stickelback 7

White Catfish 6

7 8

8 8

8 50 12 62 52 White Perch i 25 12 7

16 85 16 8

8 8

165 6 304 8

12 8

Yellow Perch 118 291 23 23 31 388 669 15 248 330 43 43 6

a Monthly Totals

-7730-

-508-

-1686-

-1320-

-569- -140-

. t

?

e Table 3.1 (cont'd) CONNECTICUT Y#.1EE IMP 1NGI: KENT ESTIFATES DL"dINO 1980 September October November December Total Grand I,yingea Species

<3" 3"-6" >6"

< 3" 3 "-6" > 6"

<3" 3"-6" >6"

<3" 3"-6" >6" Tatal Percent Alcwife 8 23 62 43 8

78 66 6

150 0.3

-American Eel 38 9

0 7

66 73 0.2 American Shad 15 0

15 37 52 0.1 Block Crappie 6

8 8

20 52 80 0.2 Bluegill 37 12 5 25 42 406 61 509 1.0 3rown Bullhead 5

0

24 29

<0.1 Carp 10 0

0 24 24

<0.1 Darters 0 67 57 0.1 Frsshwater Killifish 15 5 '40 21 55 0

76 0.1 Clut Herring.

2 6

23 45 15 0 138

?,

173

'.3 105 6

105 6

0 111 0.2 colden Shiner Hogchoker.

37 149 23 60 188 0

248

.5 Lamprey Eel 6 4867 0

4873 9.8 Largemouth Bass 6

8 10 8

0 16 24 0.1 Longear Sunfish 8

0 8 30 38

'.1 Northern Pike 0

0 6

6

<0.'

Pickerel 0

0 22 22

<0.1 Pumpkinseed 90 45 75 31 43 10 103.' 14 134 351 0.7 Silverside 8

0 8

<0.1 Smslt 0

0 23 23

<0.1 Spottail Shiner 8

30 83 2356 31372 1333 2583 34410 1333 33326 76.9 Striped Killifish 10 10 10 10 0

20

<0.1 Sucker 6

45 5

0 45 11 56 0.1 Three-spined Stickel-back 7

0 0

7

<0.1 White Catfish

!$ 45 105 25 31 8

20 15 62 185 248 4 95 9.9 White Perch 15 19 6

38 225 60 10 105 148 420 598 1166 2.3 Yallow Perch 8

30 12 in 7ts ?At

'A 1063 I???

2926 3'

Monthly Totals

-490-

-642-

-628-

-35,985-

-49,843-4.0 SPECIAL SURVEILLANCE, RESEARCH, OR STUDY ACTIVITIES

+ ~

4.1 Fish Deterrent Studies

~

An electrical fish deterrent study was performed during August 1974, as a part of a continuing fish impingement study.

Results of this study were provided in the 1975 Annual Envir-onmental Operating Report, Part A: Nonradiological Report dated March 29, 1976.

4.2 Shad Monitoring Program The objective of the shad mon 5.oring program is to determine the size and population dynamics of American Shad comprising the annual spawning run in the Connecticut River.

In 1974, the State of Connecticut and the Connecticut Yankee Atomic Power Company entered into a cooperative agreement to continue studies on the Connecticut River shad population, begun by Essex Marine Laboratory in 1965. The project is to 3

run for eight years.

Approximately 5,100 American shad were tagged and released at the mouth of the Connecticut River during 1980.

In this tag and recover method of estimating population size, commercial fishermen act as the recovery mechanism. Representative fish samples are taken for age, size and sex analysis. This study

. program design her, been followed - since 1965.

The seventh annual report, prepared by Peter Hinta of the Connecticut Department of Environmental Protection covering the 1980 shad run appears in the Appendix.

4.3 Phytoplankton Studies The impact of Connecticut Yankee on phytoplankton populations in the Connecticut River adjacent to the plant was studied ber een October 1965 and September 1969 by researchers from the Marine Research Laboratory of the University of Connecticut.

However, in. issuing the. Final Environmental Statement for the Haddam Neck plant, the Nuclear Regulatory Commission (then the AEC) required an additional investigation into the increases of phytoplankton,:and the decline of the diatom Melosigs in favor of bluegreen algae.

In compliance with that requirement, an additional year of phytoplankton studies was conducted during

-1975. :A final. report describing the results of this investigation

.was:provided in the. Annua 1' Environmental Operating Report, 1C Part A: Nonradiological Report dated March 29-1976. This fulfills our requirements as.per Technica1' Specification 4.3 of LDecemberL27, 1974.

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Seventh Annual Report Connecticut River Shad Study Submitted to:

Nort'2 east Utilities Company Prepared by:

Peter Mirita Anadromous Fisheries Biologist

. Connecticut Department of Environmental-Protection Marine Fisheries March 25, 1981 a

Introduction Population size of American shad (Alosa sapidissima) entering the Connecticut River has been annually estimated since 1965 using the Petersen mark and recapture method.

Each years age and sex structure has also been determined using scales taken from the shad commercial fishery and recrea-tional fishery with additional information in 1980 from a pound net operating at the mouth of the river.

This study is supported in part by Northeast Utilities and the National Marine Fisheries Service.

Materials and Methods The tagging procedures utilized during the 1980 Connecticut River Shad Study were similar to all the previous years dating to the project's beginning; and the time frame, early April,o late May was essentially the same.

From April through May, adult American shad were captured near the mouth using monofilament drift gill nets, (stretch mesh size 14-cm,182-cm deep, and 122 to 124-m long), tagged with a yellow dart tag, and released to continue their upriver migration. To minimize tag-induced mortality, the duration of each drift varied according to the number of shad taken and to river water temperatures.

Fork length, sex, and tag number were recorded into.a tape recorder and later transcribed onto an -IBM printout log. The annual sex ratio is based on this information.

Tagged and untagged shad, subsequently captured by commercial fishermen at various locations along the river, were reported to the Connecticut Depart-ment of Environmental Protection after which a three dollar reward was paid

[_

for returned tags.

Commercial fishemen are required to report their catch on an annual basis to the DEP.

Because some fisherr.en fail to maintain adequate records and/or purposely under-report their total catch, the catch returns from certain fishermen are believed to be unreliable.

i.:s bias could seriously affect the population estimate by altering the true ratio of recoveries to total catch.

In an effort to determine which fishermen reported reliable catch data, and to calculate an adjusted commercial catch, the ratio of recaptures to total catch for each fisherman was analyzed using Chi square analysis (Leggett 1976). This method assumes that catchability of both tagged and untagged fish j

are similar, and that the probability of recapturing a tagged fish is similar among all fishermen.

A uniform ratio between recaptures and total corrercial catch (R/C) is assumed for all fishermen, considering differences due to random variation.

The number of fishermen whose catch data are considered reliable by Chi square analysis are used to calculat_ an adjusted conercial catch (C) for all fishermen with the following equation:

RC 1

C

=

2 number of tagged fish recaptured by the original fishermen where R

=

j total catch from the fishemen considered reliable by Chi C

=

square analysis number of tagged fish recaptured by the fishermen who were R

=

2 considered reliable by Chi. square analysis 2/C = (probability of rec apturing a tagged fish)

(Pr) R

=

The adjusted connercial _ catch (C) is then used to estimate the. adult c

shad population (N) by applying the Petersen equation as follows:

H = pC M

1 2

b.

where M = the number of tagged fish. Hrwever, according to Leggett (1976) tag shedding and mortality of tagged fish accounted for three and two percent e

of the total respectively.

Hence, the number of tagged fis.'i (M) is reduced by five percent.

The 95% confidence limits on the recaptures (R)) was obtained using an equation from Ricker (1975):

+ 1.92 1 1.96 Rj +1.0.

R)

Substituting the upper and lower limits for the number of recaptures (R) into the equation:

N = f, 95% confidenc'e li ait around the pc.oulation 1

esticate (N) was obtained which was valid assuming that tagged fish (M) were randomly distributed throughout the population.

The fraction (u) of the adult run harvested by comercial fishermen was estimated using:

i R)

U=7 3

Shad scales used in age determination were collected from the comercial f

I fishery in Saybrook, the sport fishery at Enfield and a pound net at the I

mouth of the river.

Each fish was measured to fork length (cm), weight (gr),

sexed, and i0-12 scales were taken from the left side at a point mid-center betwer.n the anterior edge of the dorsal fin and the lateral line.

Scale i

analysis also provided an estimate.of repeat spawners. Age was detennined by counting annuli and the repeat spawners were identified by a distinct scar on the annulus.

The Connecticut Department-of Environmental Protection fished the pound net in Long Island Sound located at a site off the Saybrook West Breakwater at the twelve to fourteen foot contour.

Total length of the pound net was 692 feet.

It was equipped with a 540 foot lead, two 125 foot

(

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hearts, and a 30 foot sqaare pound or trap.

The depth of all nettir,9 was 20 feet and the whole system was set on 57 piers with seven additier,al piers used for bracing.

The length of the piers < ere 30 feet with a b le diac.eter at the base of 3.5 to 5.0 inches.

Hardwood poles were r.ixed with spruce during 1980 but the spruce was found to be inadequate with breakage at the water line during storms.

The spruce poles had to be replaced throughout the season with hardwoods.

Results and Discussion The number of corr.ercial shad boats operating on the Connecticut River has varied considerably over the years since the Connecticut Department of Environnental Protection assumed the Connecticut River Shad Study in 1974.

A peak of 63 shad boats was reached in 1977 after which the number declined to 40 by 1980.

The number of boats operating apparently reflects the previous one or two years shad abundance and is relative to the estimated population increases or decreases.

Corrercial shad licenses issued in 1980 numbered 147 of whict.107 were fishernen who served as " strikers" or assistants to the 40 boats.

Reported catch by the coare/cial shad fishermen was 72,591. Using the Chi square technique to eliminate reporting errors in the cocrrercial fisheries reports, the adjusted figure was calculated at 77,312 shad for an exploitation rate of 14.8 percent (Table l}. The 1980 shad population was estimated to be 522,t100 1 39,000 based on the techniques utilized since the inception of the study (Table 2).

Analysis is presently underway which may adjust upward this and all previous estimates to account for gill net selectivity in the tagging captwe operation and the contrercial operation.

4

I i.

5,111 adult American shad were captured and tagged in the In 1980, Connecticut River's Saybrook-Old Lyme Reach, 719 of which were subsequently e'

returned by commercial fishermen.

Tag recoveries from this and other areas of the Connecticut River are listed in Table 3.

Outside of southern New l

Fegland, two of the previous years tags (1979) were recovered from Pamlico Sound, North Carolina and one offshore New Hampshire.

.The sex ratio in the tagging catch is shown on Table 4.

Assuming un-

]

biased sex ratios were gathered from the pound net, it was clearly demonstrated that the gill net samples are selective toward the female cohort.

Since it is known the gill net under-samples the male segment of the shad population, a simple method can be applied to estimate.se under-sampled segment. The sex ratio-in the gill net sample was 60:40 female to male and in the pound net was 48:52 female to male. When the number of females taken in the gill-net is applied to the pound net female ratio..the number of males in the pop;1ation increases by 21 percent.

Comparisons are made in percentage compos.ition by length classes in Figures 1 and 2 :for male and female shad, respectively, between the tagging I

and the pound net catch. 'The mean length of males'in the tagging catch was.

46.47 cm while the pound net mean length was 43.47.cm. Again, this data supports the premise of under-sampling the male segment by gill nets..The mean length of. females was not substantially different, being 49.69 cm in 3

the. tagging sample and 48.78 in.the pound net sample, Similar age structures. of ' female shad'were also evident from scale samples taken in three' areas; the pound net, the commercial fishery, and.

.the recreational fishery'(Table 51. There is. a noticeable lack of age. IV

.c females-in the.1980 structure which may indicate a _ lower population level

.in 1981.. Age III males are also depressed'in number which'_further supports j

5

the indication of a smaller 1981 population level.

Table 6 compares the 1980 age structure to the mean over the years of the shad study.

The older age group shad have been declining for the past f ?w years.

Repeat spawning shad percentage which invtives the older age groups have steadily declined since 1975 when the Holyote Fishlift Facility began expanded operation lifting large numbers of adult shod into the Holyoke impoundment.

Downstream migrant facilities were operable in 1980 over the Holyoke Dam but the impact will not be apparant until the 1981 migration.

Figure 3 depicts the continuous downward trend with an all-time low in 1980 of 14.3 percent.

This figure as in the past is based on the commercial fishery and recreational fishery scale samples weighed equally.

If the pound net repeat spawning percentage is calculated into the figure, the repeat spawning segment would rise to 20.1 percent. The impact of adult mortality and the increase of shad production within the Holyoke pool may increase the size of the adult virgin population and create a disproportionately low number of older shad in the annual run.

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Figure 1.

Tercentage corposition of rale

/cerican shad in the tagging catch ccmpared to the pound net catch /1980)

Tagging catch 20.0 Pound net --------

17.5 A

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Percentage ccoposition of fcnale American shad in the tagging catch compared to the pound net catch.(1980) 20.0 Tagging catch -

Pound net catch ------

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Percent repeat spawners in 1

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r year.

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e Table 1.

The adjusted comercial catch calculated 'or each year along with the exploitation rate based on the adjusted catch.

Year _

Adjusted Catch Exploitation rate _(%j_ _

1965 173,103 11.8 1966 80,853 22.0 1967 75,869 20.6 1968 58,173 20.8 1969 68,767 20.7 1970 71,367 17.0 1971 74,718 17.5 1972 51,197 18.6 1973 68,524 20.6 1974 61,509 16.5 1975 65,000 10.9 1976 107,761 14.5 1977 72.425 16.1 1978 68,850 15.9 1979 50,000 14.1 1980 77,312 14.8 d

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Table 2.

Size of the Connecticut River Icerican shad populaticr.1965-lE3.

O Year Estinate 1965 400,000* 1 15" 1966 367,000 1 25,000 1967 363,000 I 24,000 1968 280,000 I 19,000 1969 333,000 1 22,000 1970 419,000 I 37,000 i

+

1971 428,000 - 31,000 1972 275,000 I 17,000 1973 332,000 I 28,000 1974 372,000 1 28,000 1975 598,000 1 70,000 1976 740,000 52,000 1977 450,000** I 20,000

-1978 432,0N) I 39,000 1979 355,000 A 33,000 1980 522,000 1 39,000

Fecalculated due to the ir.ordinately high nesber of repeat spawners in the 1965 run of over 700,000 and the total population of 1954 being 400,000.

- Adjusted for: imbalance in sex ratio.

r $*

Table 3.

Total Southern New England tag recoveries of American shad tagged in 1980.

Total shad tagged at mouth of river S,111 Tags returned by:

Commercial fishery 719 Enfield Sport fishery 28 Holyoke Sport fishery 48 Westfield River sport fishery 2

Farmington River sport fishery 2

New Haven Harbor 1

Rhode Island Sound 1

Montauk, N. Y.

1 Tags collected at Holyoke Fishlift (1980 tags) 56 Total tags recovered 858 Tags observed in the Holyoke fishlift 579 w

4

Table 4.

Proportion of females to males in tagging catches '1967-1980 o

Year

% Females

% Males y

1967 42 58 1968 59 41 1969 58 42 1970 53 47 1971 48 52 1972 50 50 1973 54 46 1974 49 51 1975 52 48 1976 56 44 1977 82 18 1978 52 48 1979 59 41

=

60 40 1980 3}-

q

.s lTeble. 5.:; Agistruhture of American shad taken in the Pound Net, Commercial Fishery, and the Enfield Recreational Fishery and:repea'. spawning information.

Age: Class-III'

'IV V

.VI -

VII VIII IX X

% Repeat Spawners T ound Net P

Female (279)

T..

26

' Number 0

35-204-

'31 7

1 0

1

-.Mean Fork length.

46.03 48.60 51.32 54.00 55.00 60.00 Ma.1e-(307) 104 34 1 Number 12:

-128.

131 36-0 0

0

-0 Mean Fork Length 37.67 41.58 45.00

'46.78 Commercial 1 Female (311) 25 8

Number-0 30 245-33-3 0-0 0

Pean Fork-' Length _

46.13, 48.37

.50.64 53.67

-Male-(219) 65 30

' Numbe r.

-:1 26 134 55 3

'O 0

0 Mean Fork Length.

40.00'

.~ 42.58.

44.95 47.46-50.00 Enfield Fcmale(290) 40 14 Number; 0

. 220 41 8

0 0

0

>Mean Fork Length-L46.43 49.05 50.68 53.88 Male-(151) 9 6

Number' 23-72 T45 10 1

0 0

0

- Mean Fork Lerigth

~40.52-41.92 45.76 47.60 48.00 Total-Repeat' Spawning Percentage, all weighed equally - 20.1%

~ Pound Net --30.2%

Commercial,-17.1%

Enfield

' - 11.3%

Table 6.

1980 age structure in percenta9e compared to the rean fcr 1967-1980.

Age Class III IV V

VI-VII VIII-X g

Male 1967-1980 10.1 40.2 31.8 15.7 0

1980 5.3 33.4 45.3 15.5 0

female 1967-1980 0.4 21.4 59.9 23.0 2.6 1980 0

9.8 76.0 14.0 0.2 P

-

ML20003E606

Contents

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1.0 INTRODUCTION

SUMMARY

SUMMARY

SUMMARY

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ML20003E606

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1.0 INTRODUCTION

SUMMARY

SUMMARY

SUMMARY

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SUMMARY

SUMMARY

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