ML19224D761

Treatment of Cooling Water W/Sodium Hypochlorite, May 1973

ML19224D761
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	05/31/1973
From:	VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML19224D757	List: ML19224D756 ML19224D761
References
ZAR-730531, NUDOCS 7907170013
Download: ML19224D761 (28)

Text

.-

9 TPIAE!ENT OF COOLING '4ATER ~JITH SODIW HYFOC E mI'E E THE VEF1'CNT YANKEE ?IIICLEAR PC'JER STATICN, VEP' ION, 7E CT:E -

m J ' ;^ -

Closed Cycle Operation INTfiODUCTION The studies were conducted to define the concentration-time reistianships of free and cc bined chlorine (1) at the cooling tower inlet fferetay), (2) at the cooling tower outlet, (i.e. af terbay and blowdcwn) 2nd (3) in tha i-a" ate receiving water area (Vernon Pond of the Connecticut River).

The study reported here was conducted during May 1973.

During this period knd since commercial operation began in September 1972) the plant has been operated entirely in the closed cycle code, hence, cooling water discharged to Vernon Pond was limited to blowdown.

Since the first chlor-(I) ination on March 27, 1973, to date, the plant has operated at 755 of full power (i.e. 405 NVe).

The point of hypochlorite injection to the cooling rater avsten is betweer the trash rc.cks and vertical traveling screens in the intake structure.

Chlorine was injected in the form of 12% sodium hypochlorite solution.

METHODOLOGY Chlorination was perforced by the 7erront Isnkee Chemistry and Health ?"ys'es Staff and campling and analyses were perferred both by plant sta##

ad "'e cher is-try staff of Acuatec, Inc. of South Eurlington, 7er cnt. Ecth plant staff and Aquatec staff had the opport. unity to concult personally with Dr. Joseph E. Driley, Environmental Statement Project, Argonne National Laboratory. On May 3-4, 19"3, Dr. Draley visited the plant, and personally ran several cnalyses for free cd combined residual chlorine with the Vermont Yankee and Aquatec staff in attend 1nce.

For the remainder of the progr1 in May grab camples were collected in 'he gg forebay and af terbay of the discharge structure by lowering 2 veigPted plac:ic bottle on a rope into the bays. Grab samples of the blovdcwn rere c^ aa+ nd frc:

the blowdown discharge pipe on the apron of the discharge stru;ture.

31 ples of river water were collected in the river within 1C0 feet of the river edge of the discharge structure.

Backg"ound chlorine residuals were re2 ured before chlor.z.uticr.

Jter initiation of chlorination at the intake stracture, cooling water 31 ples.rere collected in the forebay every one to two ninutes and titrated for total chicrine residual.

'4 hen the maximum total chlorine ccncentratien was approached titr;ti for free chlorine residual were also perfor ed.

'4 hen the maximum resih11 in ::.a forebay was reached, campling of the afterbay and/or the b1cwdown wac terun.

512-pling 2nd titratien for total and free chlorine was continued antil the pattern of decay of chlorine concentration was establiched.

S1 pling of the river was begun af ter the maximum chlcrine residual was detected in the bicvdown c22;1ec.

In addition to these stidies, on May 17, 1973, the bicudcwn was 21 pled exclusively during one chlorination run to obtain more ec plete ccncentrati:n-time data on the plant discharge.

The 2nalyses for total and free 2vailable chlor ze tere icne -y the 79071700/J SUb

}26

t1 A perometric Titration Method, Section 1143, Standnrd Vethois for

Ex1ninstion of Water and 'instewater, 13th Edition.

The an11 ces aera 7

perfor ed with a Wallace and Tiernan A perometric Titrator, Series A792.

Tabulations of all experimental results are attached (pages 1 1oT.

The results have been sv riced graphically on experimental runs in which the quantity of data was cufficient to justify such a presentation. Maxima on thess graphs were obtained by extrapolation.

A graphical presentation of data on pages 19-24 follows the tabular data se ry on pages 1-19.

SLMMARY 1.

Data presented (pages 1-24) on the resulta of test ecoling water chlorination are confined to plant operation under the following specific conditions.

Complete closed-cycle operation utilicing both rechanical-draf t we -type a.

(()

cooling towers (11 cells each tower).

b.

Data frc one conth (May).

c.

Operation only at 75% of full power (i.e. 405 MWe).

2.

During the test period in May, total residual chlorine concentra:icns zere, except for one case observe 4 below the 0.1 mg/l regulatien limit (0.03 mg/1) in the af terbay and blowdown (cooling tower outlet) fpages 22-23) wk* ' a -ve'-"' 'otal residual chlorine in the forebay condenser outlet-cooling tower inlet was reccrded once as 0.64 mg/l (pages 11 and 21). Throughout May, hypochlorite ws regularly injected 6 days per week at 50 gallons per day in one 10-minute slug each day.

3.

Chlorination data are not developed for open cycle-operation 2nd/or operation at other times of the year, viz. sur:er =cnths when bacterial, fungal and nlg11 growths can be expected to be maximum within the cooling water systers and 'he g

cooling towers. For these reasons, the herein reported test chould not be regarded as conclusive as to what steps might be necescary to prevent biological fouling of the cooling water hardware at (a) 100% of pcwer, (b) cunner conths and other tires of the year, (c) open-cycle operation.

4.

Under the conditions of the present test, the chlorinaticn protocol ador:ed experimentally has 'ceen adequate to keep the condenser cycta= car zg in 2 reaccn-able : bate of cle1nliness.

It has, however, not resulte cdequate control of d

3-bactecial cline growth in the cooling towers.

Apparently a great deal of recidusi chlorine is evaporated in cooling tower water vapor and drif t.

This slice tulld-up is seen by Vermont Iankee staff to b.e potentially 1 cericus proble: to pl1nt opera *, ion particularly in the summer conths when increased 1 bient river tercers-tures occur.

Ambient river temperature in May (present tect) ranged frcr 2ppron-imately 50-65CF while 7ernen Pond river temperature in July and

r

ct c1n ce C

expected to reach as high as 75-80 F based on historical data.

5.

At no time did the total residual chlorine concentraticn in the c_ /er 1:

1 point 1C0 feet frc the discharge peint exceed 0.01 ag/1.

For the 12fority of analyses, no reasurable to'al residual chlorine a2: detze:ed in the ri/er.

c.

If and when the plant is allowed once-throug" :coling 'open-ycle :;;rstica' a new test period for cooling water chlcrination wi.1 protably be necec;2ry ainae 7c(

.) b d h u!,l

, n

1 the results of the present chlorination testing on cloced-cycle :persticn chauld not be extrapolated (or if so, with great care) to (a) open-cycle opera icn and/

or (b) operation at 100% power, and/or (c) operation in c"--a"

"-d winter non 'ac.

For these three reasons, it is reconnended that 7ernont Iankee be permitted additional testing periods under varying conditions (supra) based solely on need (condenser-cooling tower cleanliness) with the present upper total residual chlorine concentration limit for testing (RE: Non-Radiological Technical Speci-fications Section 1.0.B.2, page 3) of 0.5 ng/l at the point of discharge to the river (af terbay/ blowdown).

O ic-

.,0 JJU i L.

CHLORINE RESIDUALS IN DISCHARGE STRUCTURE FCREGAY Gallcns of Total Chlcrine Free Chicrine Hupcchlcrite Residuals Residuals Date Run Addec Observed Extracolated Cbserved Extracclated 5/14/73 I

50 0.06 0.05 0.C2 C.C3 II 150 0.20 0.24 0.04 C.09 III 50 0.18 0.18

<.01 5/15/73 I

50 0.10 0.lE C.0L C.C6 II 50 0.27 0.35 0.06 C.08 III 50 0.35 0.38 0.12 0.13 IV 50 0.28 0.40 0.12 C.15 O

CHLORINE. RESIDUALS IN DISCHARGE STRUCTURE AFTERSAY Gallons cr Total Chlorine Free Chicrine Hypcchlcrite Residuals Residuals Date Run Added Cbserved Extracciated Ebcerved Extracciated 5/14/73 I

50 0.02 II 150 0.05

<.Cl III 50 0.08

<.01 5/'c/73 I

50 0.02 h

50 0.05

>.01 III 50 0.0S

>.Cl IV 50 0.05

>.01

'C/

JJJ 1,90,

VERMONT YANKEE CHLCRINATICN STUDY Date:

S/4/73 Run:

I Gallons of Hypochlorite Added:

Forebay Aftercay 61cudoun River Time Free Total Free Total Free Total free Total 1132 1136 0.00 1137 0.00 1139 0.10 1141 0.00 0.08 (7) 1145 0.02 0.12 1148 0.00 0.C6 1150 0.00 0.03 1152 0.00 0.C6 1158 0.00 0.05 1204 0.04 0.C0 1209 1214 0.00 0.00 1219 0.C0 0.01 1231 0.01 h

JJU

'l iTq 7 r_ /

J VERMONT YANKEE CHLCRIf,ATION STUDY Date.

5/14/73 Run:

I Gallons of Hypochlorite Added:

50 Forebay Afterbay alcudcun River Time Free Total Free Total Free Total Free Tctal 1116

<.01

<.01

<.01 1118

<.01 1120

<.01 1123

.01 1125

.03

1. I) 1126

.C6 1129

.02 1131

.02 1134

<.01 1136

<.01 1203

<.01 1207

<.01 1213 4.01 M

-h A

g

~b J V I

(

i _

4..

VERMCNT YANKEE CHLCRINATICN STUDY Date:

5/14/73 Run:

II Gallans of Hypochlcrita Added:

< 150 gallons Forebay Afterbay Slcudcun River Time Free Total Free Total Free Total Free Total 1350

<.01

<.01

<.Cl 1352

<.01 1354

<.01 1355

.09 1357

.01 1359

.20 1603

.05 14C6

.C4 16CS

<.31 1412

.C4 1415

.05 1417

.05 1L20

.C3 1423

<.Cl 1425

<.01

.03 1428

<.01

.C3

'a y !~

e-

,,r

.). )

)

s c._

-5_

VERMONT YANKEE CHLCRINATICN STUDY Cate:

5/lL/73 Run:

III Gallons of Hypochlorite Added:

50 Fcrebay Afterbay Sloudcun Rivar Time Free Total Free Total Free Tctal Free Tcta; 1515

<.01 1917

<.01 O

1519

.01 1521

.la 1523

.08 1529

<.01 1532

<.01

.C8 1534

.05 1538

.05 k

• 7 e.

'n' las

-o-VERMCNT YANKEE CHLCRINATICN STUDY Date:

5/15/73 Run:

I Gallons of Hypochlcrite Added:

50 Forebay Afterbay Sicudoun River Time Free Total Free Total Free Total Free Total C801

<.01 C803

<.01 O

0810

<.01 Cal 2

<.01 C814

<.01 CS16

<.01 CSIS

.03 CB19

.08 CS23

.0L

.10 0829

<.01 C330

.01 CS32

.01 0634

.01 CS36

.02

.02 C635 CSLO

.01 CSL2

.01 08L3

.01 m

CSL6

<.01 U

CSL7

.01 CSL9

.01 0551

.01 s

r

~

VERMONT YANKEE CHLCRINATICN STUDY Date:

5/15/73 Run:

II Gallens of Hypochlorita Added: 50 Forebay After0ay Slcwdcun River

_Tima Free Total Free Total

1. rce Total Free Total 1001

<.01 1002

<.01

("\\

1003

<.01 1006

<.01 1006

<.01

.03 1007 1003

.02

.13 1013

.06

.27 1017

.07 1019

<.01

.05 1022

.05 102L

.0L 1026

.05 1027

.04 1029

>.01 1033

.03 103L

.02 1036

.03 g'sg 1035

.03 10L0

.01 1043

.02 104L

.02 1045

.02 7c/

J fI'

• e3

VCRMONT YANKEE CHLCRINATION STUDY Date:

5/15/73 Run:

III Gallcos of Hypochlcrite Added: 50 Fcrebay Afterbay Blowdcun River Time Free Tctal Free Total Free Total Free Total 12L3

>.01 A

1240

>.01 12L5

>.01 12L7

>.01 12Le

.02 12L9

>.01 1251

.11

.30 125L

.12

.35 1300

>.01

.C8 1303

.07 1,, C a-

>.L.

1307

.C4 13C0

.CL 1310

.03 1312

.03 131L

.02 1315

.03 1317

.02 h

1313

.02 1320

.03 1322

.02 132L

.02 J

s j

_o-VERMONT YANKEE CHLCRINATION STUDY Date: 5/15/73 IV nun..

Gallons of Hypochlorite Added:

50 Fcrebay Afterbay Slowdcun River Tir.c Free Total Frea Total Free Tctal Frca T: al 1509

>.01 p

1511

>.01 1512 1513

>.01 1514

>.01 1515

>.01 1516

>.01 1518

.03 1519

.18 152]

1523

.12

.28 1527

.05 1529

.05 1533

.07 1534

.0L 1535

.0L 1537

>.01

.05 15L0

.03 7 F. p/

o J ~) J

\\

) lj

\\

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VERMONT YANKEE CHLCRINATION STUDY Date: 5/17/73 T

-nun:

Gallons of Hypochlcrita Acded: 25 (Neu Lat)

Foreb3V Afterbay Slcudcun River

,ima Free Total Free Total Free Tctal Free Total 1029

>.01

>.01 O

1031

>.01

>.01 1032 1033

>.01

.01 1034 1035

.20 1038

.GO

.05 1044 1CL9

.02

>.01 1051

.01 1053

.04 1054

.02 1055 1057

.01

.02 1059

> 01 1101

.03 1103 g

11~05

.02

.01 1107 1109

>.01 7

N.c -

, ~s.' l

)

v

11 -

VCRMCNT YANKEE CHLCRIT;ATICTJ STUDY Date:

5/17/73 Run:

II Gallons of hypochlcrite Added:

30 Foretcy Afterday Slowdcun River Time Free Total Free Total Free Tatal Free Total 1302

<.01

<.01

<.01 13C4

<.01 1305

<.01 1306

.01 1307

<.01 1308

.15 1310

.51 1311

.64 1316

.15 1318

>.01 1320

.C2 1322

.04 1323

>.01

>.01 1326

.03 1320

.02 1329

.Cl 1331

.02 1333

.01 1330

.02 ih 1335

.02 J

• -)

Ja3 l J

-n VCRMCNT YANMCE CHLCRINATIC'J STUDY Octe:

5/17/73 Run:

III Gallons of Hypcchlorita Added: 25 Forabay Afterbay alcuccwn River Time Free Total Free Tctal Free Total Free Tctal 15C2

>.01 1503

>.01 Q

15CS

>.Cl

~

15G5

>.01 1507

>.01 1503

>.01 1503

>.01 1510

>.01 1511

>.01 1512

.C8 1513

.C8

.12 1516

>.01 1~1a3e

.02

.I c..l o.

.03 1520

,a1 1522

.01 0

.. [

/

L j'

s) s 6 i s

VCRMCT;T YATMEE CHLCRIT;ATICT; STUDY Date:

5/18/73 nun:

I Gallons of Hypcchlorita Added:

Fcrebay Afterday Sicwdcun River Time Frco Total Free Tctal Free Tctal Free Tctal 0053

>.01 0958

>.01 1CG5

>.01 1007

>.01 1CCS

>.01 1010

>.Cl 1011

.03 1C12

.30 1014

.C5 1015

.38 1016

.C2

.12 1021

>.Cl 1C26

.02 1030

.02 O

n-

.]

1., -

VERMCT;T YATMEE CHLCRITJATICTJ STUDY Date: 5/18/73 Run:

II Gallons of Hypochlorita Added:

Forebay Aftarbay Blowdcun River Time Free Total Free Tctal Frae Total Free Total 1327

>.01 1343

.C2 O

1344

>.01 1346

.CL 13L7

.62 1349 46 1353

.C8

.14 1359

.07 1602

.C2

>.01 O

t

..L

15 -

V-tjpg,,: h4 3.,6t.c.

w h.L Cn 3 m, l cu..:2 UDY

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3 m.,. c.

5/29/73 nun:

I Gallons cf Hypochlorite Addec: 25 Foreboy Afterday Slaudcun River Ti c Free Total Free Total Free Total Free Istal ICLR 0

0 1053 0

Q 1055 0

1058 0

llCO 0.02 11C2 0.02 llCL 0

1105 0

1105 0

O J j ()

a F

v

'.3 VERMCNT VANiSCC CHLCRINATIGN STUDY Date:

S/25/73 Run:

I Gallons cf Hy;)cchlorita Added:

Forebay Afterbay 81cudcun River Ti m.a Free Total Free Total Free Total Free Total 0

0 1020 0

0 1050 0

0 IC55 0

C 1105 1110 0

0 a S*4 l t: :,

f

VCRMONT YANKEE CHLCRINATICN STL'DY Date: 5/2S/73 Run:

II Gallons of H iciilcrita Acded:

50 Fcrebay Afterbay Blcudcun River

_ Time

_F r.e e Total Free Total Free Total

-ree T tal 0

0 1509 1511 0

A 1513 0

1516 0

1519 0.C5 1521 0.02 0.C6 1523 0

0 1527 3

1531 0

1535 0

O i

J.c (J

, /; 3

- 1: -

VERMCNT YANF CHLCRINATICN STUDY Date:

5/29/73 Run:

II Gallcn3 of hypochlorita Acced:

25 Forebay Afterbay Slcudoun River Time Free Total Free Tctal Free Total Free Ts:al 1413 0.02 1414 0.03 C

1415 0.03 1417 0.00 IL18 0.CC 1420 0.00 0

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