Text

Annual Environ Operating Rept,Part a: Nonradiological Rept,1981
	ML20050N499
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	03/31/1982
From:	; CONNECTICUT YANKEE ATOMIC POWER CO.
To:	;
Shared Package
ML20050N496	List: B10471, Forwards Annual Environ Operating Rept,Part a: Nonradiological Rept,1981; ML20050N499;
References
	NUDOCS 8204140365
	Download: ML20050N499 (24)
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CONNECTICUT YANKEE ATOMIC POWER COMPANY llADDAM NECK PLANT liADDAM, CONNECTICUT ANNUAL ENVIRONMENTAL OPERATING REPORT PART A: NONRADIOLOGICAL REPORT January 1, 1981 --- December 31, 1981 Operating License No. DPR-61 Docket No. 50-213 i

March 31,1982 e

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1 TABLE OF CONTENTS ETS O

Page Section

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 MaximumfiT Across the 2

2.1.1 Condenser and Maximum Discharge Temperature 2.1.2 Rate of Change of 3

2.1.2 Discharge Temperature 2.1.3 Deicing Operations 3

2.1.3 2.2 Chemical 16 2.3 2.2.1 Biocides 16 2.3.1 2.2.2 pH 16 2.3.2 3.0 ENVIRONMENTAL SURVEILLANCE 18 3.0 3.1 Nonradiological Surveillance 18 3.1 3.1.1 Fish Impingement 18 3.1.1 3.1.2 Meteorological Monitoring 18 3.1.2 4.0 SPECIAL SURVEILLANCE, RESEARCH OR STUDY 21 4.0 ACTIVITIES 4.1 Fish Deterrent Studies 21 4.1 4.2 Shad Monitoring Program 21 4.2 4.3 Phytoplankton Studies 21 4.3 e

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1.0 INTRODUCTION

1.1 Connecticut Yankee This environmental report has been prepared for the Connecticut Yankee Atomic Power Company (CYAPCO) by the Northeast Utilities Service Company (NUSCO). CYAPCO operates the IIaddam 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 Haddam, 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 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 MWL 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 600 MW of gross electrical power.

1.2 Purpose of this Report This report 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 (ETS Section 2.0) for the report period January 1, 1981 through December 31, 1981.

d 2.0 LIMITING CONDITIONS FOR OPERATIONS 2.1 Thermal Tempera [ureandpHarecontinuouslymonitoredbysensingunits 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 or. its teletype and punches a paper tape for later iricorporation 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 li T Across the Condenser and Maximum Discharge Temperature Table 2.1 shows ranges of int'ake and discharge temperature as monitored by the primary system, their dif ferences, and the maximum hourly rate of change of discharge temperature for each day during the period January 1 through December 31, 1981. When the primary monitoring system was inoperative, data from the secondary system we_re incorporated into the i

record.

Intake temperatures ranged f rom 30.9 F in January to 87.6 F in July. Discharge temperatures ranged from ambient during periods of shutdown.Lo 111.9 F on July 11.

The specified maximum temperature increase (AT) of 26"F was exceeded tor.several periods less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 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 never exceeded during 1981.

As required by Section 2.1.1.7(d) and (c), the intake temperatures measured by the primary monitoring system were correlated with those measured by the __

l secondary system in the condenser intake waterbox.

The correlation equation is:

T

= 1.003 TSI + 0.05 (2.1-1) py where T

= primary intake temperature ( C) py Tgg = secondary intake temperature ( C) with a correlation coefficient of r = 0.997 Prior to the third week of April and af ter November 17, the intake water was warmed for purposes of deicing as permitted by section 2.1.3.

During those periods, T

= 0.931 T ; - 0.35 (2.1-2) pg g

with a correlation coefficient of r = 0.951.

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:

T,,g = 1.035 TSD - 0.9 (2.1-3) where T

= primary discharge temperature ( C)

PD T

= see ndary discharge temperature ( C)

SD with a correlation coefficient of r = 0.997 2.1.2 Rate 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 27, July 29, September 10 and December 22 due to plant trips. The July trip was from a low power level. Since these were for the protection of plant equipment, they were not violations as specified in Section 2.1.2.2.

Two apparent increases in temperature greater than 8 F, on January 2 and December 27, were caused by tidal effect carrying warm water to the intake structure.

2.1.3 Deicing Operations The periods of deicing operations in 1981 were January 1 through the third week of April and November 17 through December 31.

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TABLE 2.1 ( CCNT. )

f CCN'ECT! CUT YANKEE STATT N M:NTHLY W ATE 9 CU

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CATA FE9:C3 : 1 JAN 81/0315 - 31 JLN 81/0315 FARAMETER

)

DAY FH RANGE INT AP E TEMPEP ATUPE DISCH AOCE TEMFER ATURE TEMPER ATU7E PISE MAX.

MIN.

AVE.

MAX, MIN.

AVE.

MEC MAX.

MIN.

AN E.

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6.5-6.0 40.6 32.2 33.3 65.1 53.2 57.6

-S.6 06.6 19.4

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4 e.4-6.3 33.6 30.0 32.4 56.3 52.7 55.3

-1.6 03.9 19.1 23.0 5

6. 5-6. 5 33.1 30.9 32.1 50.3 32.5 41.6 4.0 19.3 1.6 9.5 e

6.4-6.4 39.0 33.1 34.9 62.1 57.0 58.1

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6.4-6. 3 31.0 30.0 33.6 62.8 56.8 53.0 5.9 25.6 23.2 04.4

}

8 6.5-6.4 32.5 31.6 30.1 53.1 56.3 57.6 0.7 26.1 24.8 25.5 9

6.4-6.3 23.7 30.0 30.8 61.5 57.2 53.3 0.0 27.0 23.4 05.5 10 6.4-6.3 39.7 30.0 33.4 63.7 57.4 55.5 3.4 05.0 03.9 05.0 11 6.4-6.4 24.0 32.0 32.5 60.6 57.7 58.8

-1.4 27.0 25.7 26.3

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6. 3-6. 3 33.6 32.0 32.5 59.5 57.7 53.6

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6. 3-o.0 41.7 32.0 33.3 e6.0 57.9 50.2

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}

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]

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}

08

6. 3-6. 0 41.0 33.6 35.3 65.8 53.3 60.0 6.3 07.5 03.9 25.0 09 6.3-6.0 40.6 30.5 34.3 65.3 57.0 55.9 6.3 27.2 01.8 04.6 30 6.4-6.1 36.5 32.0 33.1 59.9 56.1 57.4

3. 4 04.7 03.0 24.3 31 6.3-6.3 37.0 30.9 34.6 61.5 55.9 54.1 0.5 25.4 23.8 04.4 4

MONTH 6.5-6.0 43.5 30.9 33.8 67.3 30.5 5S.8

-8.6 31.0 1.6 05.0 FH PANCE : HIGHEST AND LC','EST FH AT DISCHA?3E CANAL (FH UNITS) g LLL TEMPERATUcES ASE IN DECPEES FAHOEM EIT M'O : MAXIMUM P ATE CF CHANCE IN O!$ Char 3E TE"FEDATUFE (DECREES / FR. )

- ** MEAN3 LACK CF C ATA FROM CCNTINUOUS " NITCEING SrSTEM CUE TO SENG02 FALFUNCTICN (PECU!CED GUAS SAMFLE DAT A M AVE EEEN T AKEN) k M

( (

11

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TALLE 2.1 ( CONT. )

I CONNECTICUT 1ANKEE STAT!CN l'O UMLY W ATEP CJ tLIT Y CATA !L"FARY CATA FE0I:3 : 1 FEB 81/0015 - 22 F;S ?!/0315 PARAMETER

)

DAY FH RANGE INTAKE TEMPEDATU E DISCHA?GE TEMFEPATUPE TEMPERATUCE PISE MAX.

MIN.

AVE.

MJX.

MIN.

AVE.

MOC MAX.

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]

I

6. 3-6. 3 43.0 34.0 36.6 66.7 57.9 60.7 4.5 06.6 23.4 24.1 2

6.3-6.1 43.9 34.9 3S.4 67.1 53.8 60.3

-3.*

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}

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-5.8 26.6 20.7 05.5 7

6. 3-6. 0 33.1 32.0 30.0 56.1 50.5 55.4 4.1 03.9 18.0 00.7 3

8 6.3-5.9 34.7 32.5 33.0 60.1 43.0 56.0

-6.5 25.7 15.5 03.2 9

6.1-6.1 33.1 30.0 32.6 58.6 56.5 57.8 0.7 26.1 23.9 05.0 10 6.3-e.0 41.0 30.5 33.6 64.6 56.8 53.4

-5.8 27.0 23.2 24.8 11 6.3-5.9 40.6 33.1 37.3 64.9 57.4 t0.8 5.8 25.7 01.4 23.5

}

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00 6.1-5.9 40.6 39.2 39.6 63.1 61.9 60.6

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24 6.4-6.1 37.6 34.0 36.0 60.1 57.9 59.7

-0.9 25.0 22.5 23.8 05 6.5-6.4 35.6 34.0 34.8 59.7 57.7 58.5 0.4 04.1 23.4 23.8 26 6.6-6.5 36.3 34.9 36.1 62.2 59.9 61.0 0.5 25.9 04.3 05.1 27 6.9-6.6 36.7 36.1 36.4 62.8 33.5 50.8 -23.0 26.6 1.8 14.3 2B 6.8-6.6 36.5 36.1 36.3 61.0 44.8 55.0 3.1 24.7 8.5 18.7 MONTH

6. 9-5.8 43.9 31.1 35.0 67.1 33.5 53.7 -23.0 27.5 1.8 23.6 PH PANGE : HICHEST AND LCMEST FM AT DISCHARGE CANAL (PH UNITS)

ALL TEMPEPATUDES ARE IN DEGDEES FAMPENHEIT M?C = MAXIMUM PATE CF CHANCE IN DISCHADGE TEMTERATU:E IDECREES / HR.I

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TAELE 0.1 (CONT.)

CCNNECTICUT Y ANKEE STAT!CN

*4TH L Y W AT E R QUALITY CATA SJ'J' AP Y CATA FEP! 3: 1 JUN 81/C015 - 30 JUN 81/0315 FADAMETER CAY PH DANOE INTAFE TEMPEPATUUE DISCH APGE TEMPER ATURE TEMPERATU9E PISE M A <.

MIN.

AVE.

MAX.

M!N.

AVE.

MRC MAX.

M!N.

AVE.

1 7.0- 6.4 73.0 70.0 71.0 97.0 04.3 c3.7 0.2 23.9 00.5 03.1 2

6.8-6.5 73.0 71.1 71.7 96.6 93.7 95.1 2.2 23.9 02.9 03.6 3

6.8-6.5 73.0 69.1 70.5 95.5 90.5 93.8 0.3 04.3 00.5 03.5 3

4 6.8-6.4 70.0 tS.O 70.1 95.5 CO.5 93.8

-1.6 04.5 :

.7 05.5 5

6.9-6.4 72.0 69.1 70.2 97.0 90.5 94.2 0.0 04.3 02.9 03.5 6

6.8-6.4 73.0 70.0 71.1 97.9 93.4 c5.4 1.4 04.1 02.3 03.4 7

6.8-6.4 73.0 71.1 70.2 96.4 e6.7 94.3

-4.7 23.9 13.7 00.9 3

8 7.1-6.5 73.0 71.1 71.6 99.3 93.9 45.9 1.8 03.9 00.1 03.0 9

7.0- 6.6 75.0 72.0 72.7 97.3 94.6 95.5 1.6 23.9 00.3 23.0 10 7.4-6.6 72.0 70.0 71.2 95.9 94.1 C4.8 1.6 24.3 23.0 03.4 11 7.4-6.6 71.1 70.0 70.4 96.4 93.0 94.5

-1.6 04.1 23.0 23.5 3

12 7.1-6.5

-".0 70.0 73.9 97.3 93.9 95.0 1.1 24.1 03.0 03.6 13 7.4-6.5 73.0 71.1 71.8 C3.2 94.3 96.1 1.4 23.9 00.9 23.4 14 7.3-6.8 73.0 71.1 72.8 97.5 95.2 c6.3

!.6 04.1 20.9 03.4 15 7.0- 6.6 73.9 70.0 72.0 97.0 94.3 95.7 1.3 04.3 20.5 ;3.4 b

16 7.0- 6.5 73.9 71.1 70.0 93.0 94.3 95.S

-2.5 03.9 22.9 03.4 17 7.0- 6.5 73.9 71.1 72.6 97.7 C4.3 C6.1 1.6 04.1 01.6 00.8 18 7.1-6.5 77.0 72.0 73.4 100.6 c5.7 97.8 0.7 25.7 20.9 03.7 19 7.4-6.8 79.0 73.9 75.4 102.2 43.2 99.9 0.7 24.7 22.3 03.6 0

00 7.3-6.6 78.1 75.0 76.3 100.9 CS.2 100.9

-0.9 25.6 23.9 24.8 21 7.3-6.6 77.0 73.9 75.3 103.6 cs.

1C0.6 1.8 05.0 23.2 04.3 22 7.3-6.6 80.4 75.0 77.6 106.3 100.0 102.9 0.7 27.0 23.0 05.3 23 7.4-6.6 78.8 74.8 75.8 100.9 100.0 101.0 1.3 05.7 24.1 25.1 b

24 7.1-6.6 77.7 73.9 75.9 103.3 99.5 101.1

-1.4 16.3 04.3 05.2 25 7.0- 6.6 78.6 74.3 75.9 100.0 09.3 100.8 1.8 05.7 00.3 05.0 26 7.0- 6.5 76.3 73.4 74.1 100.6 C3.2 99.1 2.0 25.7 03.9 25.0 27 6.9-6.5 76.1 70.3 73.6 100.6 96.8 98.6 1.6 25.6 23.8 24.9 I

08 7.6-6. 5 77.5 72.7 74.2 102.4 97.5 99.3 1.8 05.9 04.1 05.1 09 7.e-6.6 79.7 72.7 75.1 103.8 97.7 100.0 3.0 25.7 03.6 24.9 30 7.6-6. 9 77.9 74.1 75.7 100.9 99.5 100.8 2.7 05.9 20.5 25.1 MONTH 7.8-6.4 80.4 68.0 73.4 106.3 86.7 97.3

-4.7 27.0 13.7 24.1 PH RANGE : HIGHEST AND LC'4EST FH AT DISCH AUGE CANAL (FH UNITS)

~~

ALL TEMPERATUTES ACE IN CEG7EES FA4 PEN 4EIT MPC : MAXIMUM PATE OF CH ANGE IN DISOHAROE TEMPED ATUPE (CEGPEES / HR.1

- - - ME ANS LACK CF C ATA FRCM CONTINUOU3 MONITC?ING SYSTEM CUE TD SENSCR MALFUNCTICN (RECUIcED GD AS SAMPLE DATA H AVE BEEN TAKEN)

{

. (

11

II

(

TABLE 0.1 (CCNT.)

CCNNECTICUT YANFEE ST AT!ON FONTHLY WATEP CUALITY CATA SL'""ARY I

CATA FEPICO : 1 JUL 81/0015 - 31 JUL 81/0315 FAPAMETER t

DAY FH PANGE INTAKE TIMFEPATU E DISCHA005 TEMFEUATURE TEMFERATU:E PISE MAX.

M!N.

AVE.

MAX.

MIN.

AVE.

MRC MAX.

MIN.

AN E.

1 7.6-7.0 79.5 75.4 76.8 104.0 100.9 100.0 0.9 06.1 04.1 05.2 2

7.4-6.8 82.2 76.1 73.3 108.5 100.0 104.3 2.9 07.4 23.9 26.0 3

7.3-6.8 82.2 76.8 78.8 106.3 1C0.6 103.6 4.0 07.0 22.1

.S k

4 7.0- 6.6 81.3 77.5 79.0 104.5 100.9 100.3 1.8 25.0 20.1 23.3 5

6.8-6.5 83.8 77.0 78.9 103.8 100.9 101.9 0.2 04.3 02.3 23.0 6

6.8-6.5 80.8 77.5 78.8 104.0 100.6 100.0 1.4 04.5 02.1 03.0 7

7.1-6.5 22.0 78.1 79.0 103.3 101.3 102.4 1.1 03.9 01.0 23.1 k

S 8.C-6.6 82.4 78.8 80.5 105.1 100.0 103.7 0.9 04.3 20.3 03.2 9

8.0- 6.6 84.9 80.4 60.0 1C8.7 104.2 1C5.9 0.9 04.3 03.0 23.8 10 8.0- 6.6 85.1 81.1 60.8 110.1 104.9 107.1 1.8 05.4 03.6 24.2 11 8.0- 6.8 e6.0 82.9 83.7 111.0 107.0 ICS.6

-2.5 25.7 23.6 04.9 I

12 7.8-6.9 87.6 80.0 84.8 111.7 99.3 107.6

-5.6 24.7 17.1 00.8 13 7.4-6.9 E6.7 e2.2 84.7 111.0 107.0 109.2 1.4 26.5 23.8 04.6 14 7.1-6.8 e5.8 81.3 83.8 110.8 106.0 109.3 0.7 25.0 23.4 04.5 15 7.1-6.8 83.8 80.2 81.5 103.1 104.5 105.9 1.8 04.8 03.*

24.3 I

16 7.5-6.6 84.0 79.7 81.6 107.6 104.5 1C5.9 1.6 24.8 02.0 04.3 17

7. 9-6. 9 84.4 79.9 er.?

103.1 104.7 1C6.6 1.3 05.0 03.8 04.4 IS 7.3-o.9 25.3 80.4 82.8 110.5 105.4 107.6 0.2 26.C 23.6 24.8 19 7.4-6.8 85.3 80.8 83.0 110.5 105.8 10S.1 1.8 06.1 03.9 05.0 I

20 6.4-6.5 e6.0 80.4 83.0 110.3 105.1 103.2 2.2 26.5 03.4 05.0 21

6. 9-6.5 83.5 80.2 80.0 103.3 105.4 106.8 1.6 25.7 23.2 04.8 00 6.9-6.5 e2.9 79.5 80.9 106.5 104.0 105.3 1.3 06.5 23.6 24.4 23 7.5-6.5 82.6 78.6 80.2 106.5 103.1 104.6 1.3 25.0 23.4 24.4 I

24 8.0- 6.8 84.0 70.0 81.0 108.7 103.6 105.5 1.9 05.0 23.8 04.5 25 8.3-6.9 82.6 70.5 E0.8 106.3 95.0 101.7

-4.5 25.9 14.0 20.9 26 7.9-6.9 83.3 78.8 80.7 111.4 104.2 107.5 3.6 09.3 25.4 06.8 07 7.8-6. 9 E2.9 78.6 80.7 103.3 94.8 102.6

-5.0 28.1 14.0 21.9 k

23 7.5-6.9 82.2 78.1 80.3 105.8 101.3 104.0 1.6 04.8 19.8 03.6 29 7.4-6.6 81.1 77.9 79.1 105.1 79.7 83.5

-8.3 23.9 1.3 4.4 30 7.8-6.8 79.3 76.8 77.9 87.8 78.6 81.3 0.7 9.4 1.3 3.4 31 7.9-6.9 79.7 77.0 78.1 103.6 86.5 94.9 3.2 04.8 9.0 16.8 k

MONTH 8.3-6.5 87.6 75.4 80.9 111.9 78.6 103.5

-8.3 29.3 1.3 02.6 FH PANGE : HIGHEST AND LCWEST PM AT DISCH ARGE CANAL (FH UNITS) k ALL TEMPEUATUTES A:E IN CEC:EES FAhPEN9EIT Mc : MAXIMUM P ATE CF CN ANGE IN DISCF APGE TEMPE?ATU:E (CEGDEES / HR. )

- - - ME ANS L ACK OF D ATA FROM CCNTINUOUS MONITC?!N3 SYSTEM DUE TO SENSO9 MALFUNCTION (REQUIRED GCAS S AMPLE CATA HAVE BEEN TAKEN) t

- (

11

~-

s a8 TA9 LE 0.1 (CCNT.1

)

CCNNECTICUT YtKsEE STATICM MONTH LY 'm'aTER CUALITY DATA SUMMA f

)

CATA FEPICO : 1 AUS 81/0015 - 31 AU3 81/0315 PARAMETER CAY FH RANGE INTAKE TEMDEPATUDE DISCHAPGE TEMPERATURE TEMPERATUPE RISE MAX.

MIN.

AVE.

MAX.

MIN.

AVE.

M00 MAX.

MIN.

AVE.

7.5-6.8 81.1 76.6 78.4 104.9 101.1 100.8 1.1 05.6 23.6 24.4 2

7.8-6.9 81.1 76.6 73.7 107.6 100.2 103.9 2.0 07.0 04.5 05.1 3

7.9-7.0 83.1 77.9 80.3 106.5 102.7 104.4 1.8 25.0 02.7 04.2 3

4 7.5-7.0 82.9 79.5 81.1 107.6 103.8 105.4 0.2 24.8 03.4 24.3 5

7.0- 6.8

!!.3 79.0 eo.1 105.6 103.6 104.5 1.1 24.8 03.8 04.4 6

7.6-6.8 80.1 77.9 78.7 103.3 100.9 100.1

-1.3 03.9 22.9 03.4 7

7.8-6.9 84.0 79.0 81.5 103.5 102.2 100.S 1.3 23.4

]

8 7.6-7.0 80.2 79.3 20.2 104.2 103.3 103.7

-0.5 24.1 03.0 03.6 9

7.4-6.8 83.4 76.3 78.7 102.6 101.3 101.8

-0.5 25.0 23.4 23.9 10 7.4-6.6 80.0 77.7 79.3 105.1 102.9 104.3 1.1 23.0 00.5 00.9 11 7.6-6.8 80.9 79.5 81.1 100.7 100.0 100.4

-0.5 20.9

]

12 7.1-6.9 81.3 79.3 80.0 103.8 102.9 103.4

-0.5 03.6 23.0 23.0 13 7.5-7.1 80.0 79.5 80.3 103.5 100.6 103.0

-0.4 03.4 23.0 03.2 14 7.6-6.9 83.1 78.6 80.0 103.8 101.8 100.7 1.1 23.8 19.8 00.5 15 7.6-7.0 83.5 78.8 80.3 104.0 101.1 102.6 2.5 22.9 20.7 02.3 3

16 7.4-6. 9 80.0 77.9 79.9 103.8 99.5 100.2 1.8 22.9 01.2 00.3 17

7. 6 - 6. 9 60.8 75.7 78.0 100.7 99.1 100.3 2.7 04.1 00.9 00.3 18 7.9-6.9 78.6 75.7 76.6 103.2 97.7 98.7 1.1 22.5 21.4 20.1 19 7.8-6.8 79.5 74.5 75.4 100.0 C6.6 97.7

-0.0 23.9 20.5 00.3 3

0 7.3-6.6 77.0 74.1 75.1 99.1 96.8 97.4 2.0 23.6 21.4 00.3 21 7.6-6.8 77.5 73.4 74.5 99.1 95.7 96.7

-1.6 03.0 21.6 22.2 20 7.5-6.6 76.6 70.7 73.9 93.8 95.2 96.3 2.7 22.9 20.0 02.4 23 8.0- 6.6 77.5 70.5 74.1 C5.9 75.0 87.3

-5.0 22.9 0.0 13.0 0

24 7.6-6.9 74.1 72.7 73.3 74.5 72.7 73.5 0.7 0.9 0.0 0.0 25 7.9-6.9 74.3 72.1 73.0 83.6 71.8 75.5 3.4 6.8 0.0 0.5 26 7.6-6.9 75.0 71.4 72.7 C6.6 79.0 89.9 0.5 22.3 6.7 17.0 27 7.6-7.0 74.8 72.3 73.3 96.6 94.3 45.3 1.6 22.5 20.7 00.1 0

28 7.5-6.8 75.4 71.6 73.5 97.5 94.1 95.7 1.6 20.9 21.4 00.0 29 7.8-6. 8 75.9 72.3 73.9 97.7 94.6 96.3 1.6 23.0 00.9 22.3 30 7.1-6.8 75.7 72.1 73.6 97.7 04.3 95.8 2.7 23.0 21.6 22.0 31 7.5-6.6 77.0 72.1 74.2 93.8 94.6 96.4 3.2 23.0 20.7 00.0 0

MCNTH 8.0- 6.6 84.0 71.4 77.0 107.6 71.8 96.9

-5.0 27.0 0.0 20.4 FH RANOE = HIGHEST AND LCWEST PH AT DISCHAPOE CANAL (FH UNITS 1 I

ALL TEMPEPATUDES ARE IN CEGREES FAHRENHEIT MRC = MAXIMUt1 RATE CF CHANGE IN DISCHARGE TEMFERATUWE (CECDEES / HQ.1

MEANS LACK CF DATA FRCM CCNTINUCUS MONITCPING SYSTEM CUE TO SENSCR MALFUNCTION (REQUIRED GDAB SAMFLE DATA H AVE BEEN TAKEN)

{

W.

II

TA3tE 2.1 (CCNT.1

)

CONNECT 0 CUT YAMEEE STATICN M0'4TMLY WATER CUALITY CATA EUM"ARY

)

CATA PERICO : 1 SEP 81/0015 - 30 SEP 81/0315 PADAMETER CAY PH PANGE INTAVE TEMPERATUTE DISCHADGE TEMFERATURE TEMPEPATUDE RISE M L(.

MIN.

AVE.

MAX.

MIN.

AVE.

MDC MAX.

MIN.

AVE.

I 7.0- 6.8 76.8 72.3 74.5 9S.8 c5.0 96.8 0.3 23.0 01.6 00.3 0

7.0- 6.6 76.1 72.5 74.5 97.9 45.5 96.8 1.8 03.4 21.0 02.3 3

6.8-6.6 75.7 72.7 74.2 97.7 95.5 96.5

-1.1 00.9 21.0 00.3

)

4 6.9-6.5 75.7 71.2 73.7 97.5 94.8 96.0 1.6 24.5 01.4 00.3 5

6.9-6.5 76.1 72.1 73.7 97.7 94.6 95.9 2.7 03.8 01.4 20.0 6

7. 3-6. 5 77.5 70.3 74.4 97.1 94.6 96.6 0.5 03.0 21.4 22.3 7

6.8-6.5 76.3 72.7 74.6 9S.6 C5.2 96.9 1.8 03.4 21.4 20.4

)

8 7.0- 6.5 77.5 71.8 74.6 100.0 94.3 96.9 4.0 23.0 21.6 20.3 9

7.5-6.6 75.7 71.8 73.3 97.7 93.9 95.7 1.4 02.7 01.6 00.3 10 7.6-6.8 74.5 71.2 72.9 96.1 75.0 93.5 -20.2 23.2 1.1 00.5 11 7.8-6. 8 74.3 70.3 72.2 90.7 71.6 77.7 4.1 16.4 0.4 7.5

)

12 7.4-6.6 74.3 70.9 72.6 96.4 23.7 93.1 0.3 03.0 17.6 00.4 13 7.8-6.8 75.4 71.4 73.4 97.3 93.9 95.6 1.6 23.0 01.1 00.2 14 7.9-7.0 76.8 71.0 74.0 93.8 94.1 96.5 0.3 23.6 21.1 00.4 15 7.6-6.9 76.8 72.5 73.9 08.0 95.0 96.2 1.3 23.0 20.9 02.3

)

16 6.9-6.6 74.5 71.6 73.1 96.6 94.1 95.5 1.6 02.9 01.4 22.4 17 6.9-6.5 74.3 70.7 72.2 96.4 93.0 94.5 1.6 23.0 21.6 00.3 16 6.5-6. 3 73.4 68.9 71.2 95.0 91.9 93.6 0.0 23.0 21.2 00.4 19 6.5-6. 3 72.1 68.2 69.8 93.7 90.7 92.2 2.3 03.0 20.3 20.3

)

20 6.6-6.4 72.3 66.9 68.8 93.4 89.6 91.1 0.7 03.4 19.8 22.3 21 6.8-6.4 72.3 66.0 68.9 94.3 E8.9 91.5 2.7 23.8 20.3 20.5 22 7.0- 6.4 71.8 66.7 69.3 93.9 89.4 91.8 2.9 23.6 23.7 02.5 23 6.8-6.5 68.7 64.9 67.1 91.9 87.6 89.6 1.3 23.2 21.1 02.5

)

04 6.6-6.3 65.5 63.1 64.3 87.8 25.1 C6.7 0.7 03.0 21.8 02.4 25 6.5-6.1 63.1 61.7 62.4 e5.8 76.8 84.3

-5.4 23.0 14.0 01.9 06 6.4-6.1 63.3 61.9 60.5 72.7 60.0 63.8

-4.1 10.3 0.0 1.3 07 6.5-6.4 60.8 61.3 62.0 63.1 61.9 62.4 0.5 0.9 0.0 0.5

}

OS 6.5-6.4 61.7 60.6 61.0 61.9 60.6 61.1

-0.4 0.4 0.0 0.1 29 6.5-6.4 60.4 58.8 59.7 60.6 5S.8 59.8

-0.4 0.4 0.0 0.1 30 6.5-6.4 58.6 57.7 58.1 SS.8 57.7 58.1

-0.4 0.2 0.0 0.0 MONTH 7.9-6.1 77.5 57.7 69.9 100.2 57.7 87.9 -20.2 04.5 0.0 18.0

~~

PH RANGE : HIGHEST AND LOWEST PH AT DISCHAPGE CANAL (PH UNITS)

ALL TEMPED ATUTES ARE IN DEGREES F AHRENHEIT b

MRC = MAXIMUM P ATE CF CHANGE IN DISCH ARGE TEMFERATURE (DECREES / HR. )

- - - MEANS LACK CF CATA FRCM CONTINUCUS MONITORING SYSTEM CUE TO SENSCR MALFUNCTION (REGUIRED GRAS SAMPLE DATA HAVE BEEN TAKEN)

)

m (

11

3 TAD LE 0.1 ( CCNT. )

2 CCNNECT CUT YANKEE STAT!O'l t*0NTHLY V ATED CUALITY C ATA CW'21 AP Y

)

DATA FEPIC3 : 1 COT 81/0015 - 31 COT 81/2315 PAPAMETER 3

DAY FH PANGE INTAKE TEMTERATU E DISCHACGE TEMPE9ATURE TEMPERATUCE PISE MAX.

MIN.

AVE.

MAX.

MIN.

AVE.

MRC MAX.

MIN.

AVC.

I 7.9-6.3 57.7 55.6 56.4 57.7 55.6 56.5 0.4 0.4 0.0 0.1 2

6.8-6.4 57.0 55.9 56.0 56.6 55.9 56.0

-0.4 0.4 0.0 0.1 3

6.4-6.4 55.6 55.0 55.3 56.1 55.0 55.3

-0.5 0.5 0.0 0.1 3

4 6.4-6. 3 57.2 55.0 55.7 16.8 54.7 55.6

-0.5 0.4 0.0 0.0 5

6.5-6.3 57.0 55.6 56.0 57.0 55.6 56.0

-0.4 0.4 0.0 0.1 6

6.5-6.4 57.2 56.3 56.7 57.0 56.3 56.6 0.5 0.4 0.0 0.0 7

6.5-6.4 57.0 55.6 56.4 57.0 55.4 56.4

-0.7 0.5 0.0 0.1 3

8 6.5-6.4 56.1 54.7 55.6 55.9 55.0 55.6

-0.4 0.5 0.0 0.1 9

6.5-6.4 55.2 53.8 54.6 55.2 54.1 54.6 0.7 0.9 0.0 0.1 10 6.5-6.4 54.5 50.7 53.8 54.5 53.0 53.8 0.7 1.1 0.0 0.1 11 6.5-6.4 54.5 52.5 53.5 54.5 52.7 53.6 0.5 0.7 0.0 0.1 0

6.5-6.5 54.5 52.5 53.5 54.5 5.7 53.7

-0.5 0.7 0.0 0.0 13 6.5-6.5 53.8 52.5 53.3 54.3 52.7 53.5 0.5 0.9 0.0 0.0 14 6.6-6.5 55.0 52.7 53.6 55.0 52.7 53.6

-0.5 0.7 0.0 0.1 15 6.6-6.4 55.0 50.9 53.8 55.2 52.7 54.1 0.7 0.7 0.0 0.3 0

16 6.5-6.4 55.0 53.4 54.2 55.4 53.6 54.4 0.7 0.9 0.0 0.3 17 6.6-6.5 55.6 53.4 54.4 55.6 53.4 54.5

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-3.4 6.3 0.0 0.7 FH RANGE : HIGHEST AND LCWIST FH AT DISCHARGE CANAL (FH L* NITS) k ALL TEMPERATUTES APE IN DECCEES FAbPENPEIT M?C = MAXIMUM P ATE OF CH ANGE IN DISCH ACOE TEMFERATUDE (DEGAEES / HR. )

- - - ME ANS LACK CF D ATA FPCM CONTINUOUS MONITC7IN3 SYSTEM CUE TO SEN307 MALFUNCTION (REQUIPED CR AG SAMPLE DATA HAVE EEEN T AKEN)

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2.2 Chemicai 2.2.1 Biocides Weekly grab samples have been collected in front of 4

the intake st ructure and in the discharge canal during the chlorinat. ion 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 dischc..xe except as noted below.

After repair of valves in the hypochlorite injection system on December 1, a mechanic incorrectly opened a drain valve. Approximately 3,850 gallons of 12%

sodium hypochlorite was discharged to the Connecticut River near the intake. Most of that discharge was drawn into the circulating water pumps, passed through the condenser and discharged to the river via the discharge canal.

Duration of the discharge was approximately one hour.

Calculations lead to an estimate that the total chlorine residual reached a maximum concentration of 10 mg/l in the discharge I

canal. This exceeded the limit in Section 2.3.1.1 of 0.1 mg/l as reported in Licensee Event Report #81-03/ETS-NR on December 8.

This incident resulted in the loss of approximately 1500 fish inhabiting the Connecticut Yankee discharge canal. A total of thirteen (13) species were identified which were comprised primarily of spot tail shiners (1180), sunfish (272), and white perch (12). A letter to the NRC, dated January 29, 1982, described the results of a survey of the discharge canal following this incident.

2.2.2 pli i

pil was monitored continuously at the intake and in the discharge canal. Values of discharge pli are included in Table 2.1.

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

i 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 pil at the discharge fell below the level of 6.8 specified in Sect. ion 2.3.2.1 and on other occasions it exceeded 8.5.

In most of these instances, the change in pil is less than or equal to 1.0 as permit.ted by Section 2.3.2.

In September the change in pil indicated by the EDAN digital data exceeded 1.0 for several periods of one or two hours duration. Grab samples taken during the 1

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1 month of September indicated that the actual discharge pil was greater than 6.8 and the difference was much less than one.

Subsequent calibcation corrected the discrepancy.

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3.0 ENVIRONMENTAI, SURVEII.I.ANCE l.1 Nonradiological Surveillance 1.1.I Fish Impingement Once each week, fish washed from the traveling screens and collected in trash baskets over a 24-hour period were identified, counted, and separated into three length g

categories ((

3",

3"-6", ) 6").

The number impinged per month was estimated by averaging the weekly counts in any one month and multiplying,the average by the number of days in the month. The estimates are presented in Table 3.1.

Environmental Technical 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 0

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.

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CONNECT 1tUr YANKEE IMPlNGEMENT ESTIMATES DURING IW1 Se p t ernbe r October Nave r.t>e r December f u t.e l Grand g.inged Species 3"

3"-6" 6"

<3" 3"-6"

'b" 1"

i"-6"

>6"

<3" 3"-6" 6"

a 1" 3"-b"

'h" Total Percent Alewife 135 135 0

0 135 0.9 Anerican Le t i

13 0

0 142 142 0.v American Shati 218 16 0

665 681 4.5 Black Crapple e

7 15 0

21 30 0.3 Bluegill 19 7

0 19 7

26 0.2 Brown Bullhead 7

0 0

22 22 0.2 Carp 0

0 15 15 0.1 Comnon Shirwr 193 279 193 310 5t))

3.5 Darters 13 169 0

th2 1.3 Glut tie r r ing 8

18 75 7

los 8

8 124 0.9 Galden Shiner 13 36 0

64 51 115 0.e Ho,t c ho k e r 38 36 7

16

.b 8

217 1.5 Long, ear Sunfish 8

6 7

84 68 l

163 1.1 Pickerel 6

0 0

15 15 0.t Pumpkinseed 68 15 7 118 76 201 1.4 Smallmouth Bass 0

0 7

7 0.1 sportail Shiner 23 W

106 224 th2 1571 6595 193 8359 58.4 Stripe! Killifish 7

25 0

7 25 32 0.2 Sucker 7

0 15 66 101 0.7 Whit e Cat f ish 8

105 13 7

491 405 425 1321 9.2 White Perch 8

23 13 M7 31 187 278 496 3.5 Yellow Perch 15 38 69 38 371 1016 1425 10.0 Monthly Totals

-665- -204-

-l'48-

-14.318-3 O

4.0 SPECI AL SURVEILLANCE, RESEAlfC_II,_OR S'IUDY ACTIVITIES 4.1 Fish Deterrent St ud i er,

.E An electrical fish efeterrent stuity was performed during August 1974, as a part of a continuing iish impingement study.

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

4.2 Shad Monitoring Program The size and population dynamics of American shad comprising annual spawning runs in the Connecticut River were studied irom 1974 to 1980 under a cooperative agreement between the State of Connecticut and the Connect icut Yankee Atomic Power Company.

The re<pii rement to conduct the annual t ag and recover study was based on the mutual concern of CYAPCO and the Connecticut Department of Environmental Protection that Connecticut Yankee's thermal plume might adversely influence the upriver migration, larval development and/or spawning success of shad.

The study began in 1965 by the Essex Marine Laboratory, and continued for twelve years a f ter plant operation demonst rated that Connecticut Yankee had no adverse effect upon American shad.

liased on this demonst rat ion, and the fulfillment of Connecticut Yankee Atomic Power Company's commitment, Environmental Technical Speciliration 4.2, which required the annual study, was deleted as of Ma rch 10, 1981.

4.3 Phytop1.ynkton_ Studies

'l he impact of Connecticut Yankee on phytoplankton populations in the Connecticut River adjacent to the plant was studied between October 1965 and September 1969 by researchers from the flarine Research Laboratory of the University of Connecticut.

Iloweve r, in issuing the Final Environmental Statement for the lladdam Neck plant, the Nuclear Regulatory Commission (then the AEC) required an additional investigation into the increases of phytoplankton, and the decline of the diatom Melosi_ra in favor of bluegreen algae in compliance with that requiremert, an additional yea r of phytoplankton studies was conducted during 1975.

A final report describing the results of this investigation was provided in the Annual Environmental Operating Report, Part A: Nonradiological Report dated March 29, 1976. This fulfills our requirements as per Technical Specification 4.3 of December 27, 1974.

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ML20050N499

Text

1.0 INTRODUCTION

1.0 INTRODUCTION

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