ML20071F561

Submits Results of Chlorine trailing-out Study.Concludes That trailing-out Beyond 2 H Per Day Does Occur,But That Permit Limitations Not Exceeded.Chlorination Level Regulated to Prevent Biofouling of Condenser

ML20071F561
Person / Time
Site:	Beaver Valley
Issue date:	07/20/1978
From:	Mcallister R DUQUESNE LIGHT CO.
To:	Beverly Smith NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20071F558	List: ML20071F556 ML20071F561
References
NUDOCS 7810200050
Download: ML20071F561 (17)

Text

{{#Wiki_filter:. :. %d hd me b Duc uesne UJ1t <m,.n. 35 Sath Avenue i burgh, Pennsylvania Enforcement Division United States EPA Region III Sixth and Walnut Streets Philadelphia, PA 19106 ATTENTION: MR. BRUCE SMITH Beaver Valley Power Station - Unit No. 1 J' NPDES Permit No. PA 0025615 Chlorine Trailing-Out Study Results Gentlemen: In accordance with the provisions of Special Condition No. 10 of the subject permit, Duquesne Light Company herewith submits the results of its chlorine trailing-out study. On the basis of the study results, the following are concluded: 1. Chlorine trailing-out beyond two hours per day.does occur. For the study period this occurrence was 63% of the test days for total residual chlorine and 36% of the time for free available chlorine. 2. The permit limitations for free available chlorine of 0.2 mg/l - daily average and 0.5 mg/l daily ,( maximum were never exceeded. 3. The level of chlorination performed is required in order to prevent bio-fouling of the condenser, On the basis of these study results, Duquesne Light Company requests that the two hour limitation contained in Special Con-dition No. 10 be deleted from the subject permit. If you have any questions, please contact this office. Very truly yours, Y&vf ? cgg ROBERT . McALLISTER Structural Engineer Enclosure ?$ feaL0005'0 f*

cc: II. A. VanWassen G.W. Moore (3) S. L. Pernick G. F. liickel (2) F.J. Dissert L. W. Johnson R. J. Monroe J. H. Latshaw ALL W/ ATTACH. S I e ? k

o i DUQUESNE LIGHT COMPANY Beaver Valley Power Station CHLORINATION STUDY The original 3-month program was initiated on April 1, 1977 and completed on June 30, 1977. This three month study was required by the United States Environmental Protection Agency Permit No. PA 0025615 Special Conditions #9 and

1. 10, and the Nuclear Regulatory Commission Technical Specification Limiting Condition for Operation of Beaver Valley Power Station No. 2.3.1.

The study, which concluded in June,1977, could not be evaluated because of insufficient data due to numerous plant outages and chlorination system malfunctions. At this time, an extension to this study period was requested by Duquesne Light Company so that additional data could be collected and evaluated. A one year extension was granted by the United States Environmental Protection Agency's Enforcement Division with the completed study to be submitted to that agency by July 1, 1978. The four attachments contain all the required information and data collected from July 1, 1977 to April 28, 1978 and displays the trailing out of both free and total chlorine residual in the cooling tower discharge. Additionally, the study displayed that at 100% full power the condenser cooling water could be chlorinated to the full rate of the chlorination system (6500 pounds of chlorine per day) without closely f approaching the maximum allowable concentrations of free available chlorine in the cooling tower blowdown. The study was carried out in accordance with Parts 9 and 10 of EPA Permit No. PA 0025615, BVPS Technical Specification L.C.O. 2.3.1 and the BVPS Chemistry Manual, Chapter.3, Part 10. The study developed a correlation between the amount of chlorine added to the BVPS Unit 1 Circulating Water System under various system conditions and the free available and total residual chlorine discharged into the Unit 1 cooling tower basin and discharge structure. A correlation was also developed between the free available chlorine residual as determined by the continuous chlorine monitor [WT-AN-2], sampling at the condenser discharge, and the free available and/or total chlorine residual sampled at the cooling tower basin and the discharge structure. In the first part of the study, the analyzer [WT-AN-2) was plagued with sample flow problems due to 1500 feet of sample tubing which was constantly fouling with river silt. These problems were eliminated when the analyzer was moved nearer to the base of the condenser. In addition, a recorder was installed in the chemistry c( laboratory sample panel in parallel with the one installed in the chlorine building so that both operations and chemistry personnel could observe the condenser outlet chlorine residual. During the past winter, an additional chlorine analyzer was installed at the discharge structure (EPA Outfall 001) to continuously monitor the discharge for 2ree available chlorine. This analyzer also relays its signal to a recorder located in the chemistry laboratory sample room and will alarm an annunciator both locally and in the control room should this concentration of free chlorine in the discharge exceed 0.4 mg/1. This allows time to isolate or decrease chlorine dosage before it exceeds the maximum allowable limit of 0.5 mg/1.

CHLORINATION STUDY (continued) The data collected does indicate a trailing-out of both free available and total residual chlorine. During normal power operation and station outages, the trailing-out lasted less than five hours after residuals were first detected at the outfall structure. Longer trailing-out periods were noted when a plant " trip" occurred during chlorination. Although detailed measurements of the trailing-out during plant trips could not be obtained (because of their infrequent occurrence), extrapolation of the data that was taken indicates that the trailing-out lasts less than eight hours after residuals were first detected. The station was shut down for maintenance at the end of April, 1978 and a detailed inspection of the cooling tower and condenser tubing was made. The cooling tower was relatively free of organic fouling; however, a thin, black layer of sludge was found to be fouling the condenser tubing. The sludge was analyzed to be 25% organic. Stone and Webster Engineering Corporation calculated that this sludge co' tid cause a loss of 7 megawatts electrical. Since the station has been chlorinating at 2he maximum dose rate possible during the last year, chlorf3ation at this dose rate should be maintained to prevent further degradation of elecirical generation capacity. In conclusion, the study showed the following: 1. A correlation does exist between the f ree available chlorine j residual as determined by the continuods chlorine monitor [WT-AN-2) at the condenser discharge, and the free available and/or total chlorine residual as sampled at the discharge structure and cooling tower basin. 2. The additional chlorine analyzer installed at the discharge structure can also be used to determine free available chlorine discharged'to the river. 3. Trailing-out of chlorine does occur. During normal power operations, trailing-out of free chlorine beyond two hours occurs 36% of the time. However, total residual chlorine has occassionally trailed out five hours during power operation and may reach eight hours if a plant trip occurred during chlorination. 4. Chlorination during power operation at the maximum dose rate possible results in concentrations of free available chlorine well below the ( limits of NPDES Permit No. PA 0025615. Chlorination at the maximum dose rate must be continued to prevent more rapid fouling of the main unit condenser. m i.

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SUMMARY

JUNE 6,10 8 FREE C 4. o u v r.Ti o n r oT nt. C E turmTioN D/cn (fr.% /0 (H R Sh (.TMl2h (HRS) Q a /^ 4 p x s seu.wt= t a 9-I-77 No SAM Pl. ES - G TATON OUTAGE 9 -2 9-3 4-4 q -s-9-6 q_, 9-S 9-9 9-to 9-1) j 9-12 9-13 q -141 9-1,5-Q-IL 9-n 9-18 9 -19 g-zo 9-21 (- 9 - Z ?. 9-23 9-29 9-zs Q-2f. 9-27 9-28 9-29 9-30 1[ V y Y E l - l 7t AuQ NvG+ o.o 7 /. o8 o.2 l 2,2 9

gg_ g }op g ~ C,H LORI A> E. STu bY - DATA SUMMAFY WAR c UNE 4., t 918: FRCE. CQ, bupArt oH TOTA L Of DJ EATioH DATE_ mg/4 CHFS) rnS //_ (RRS) 12E M AR.MS S E E. 1 cP to to-I n G T A 7 lO/J c UTAGE-to-a 10 3 16-4 t o -s 10 - G 10 / ( to-8 d to-9 i 10 -10 to-ll (o-12 jo i3 10-14 lo-IS .L lo-l6 ]0-17 10-1S 10-19 10 - 2.0 IO LI (- 10 2.2. 10 -2 3 IO-2A 10*13 10 -2 6 10-27 10-28 O 29 10 : 0 Y U Y /0 3; i i { I y i gi ve, l A VG 0.07 1.08 0 at 2.29

E V P.S - l SoF i E ~ C H L o R I N E. S TUDY-DATA S UM M A RY ~ WAR UUNE G,19'l8 FREE C4 D'JP 4Tlotl TOTAL of hp A Ti o 4 ogr E (ma/f ) ( H RST 64/O (sP A R E ra A rRKS s a a .t. o r= to \\ l-t - Y1 O O O O ii-a o o o o 11-3 o o e o 11 - 4 o c3 o O 11 - E O O o.32.

3. o c) it - /

c./ 6 '2. (, 7

c. a i 3.33 l l

'1 o,tS 2.67 c.2o 2,67 ii-8 c./f 2.33 o.t 6 2.33 II-9 o.o7 a.co

o. / 2.

2,oO II-10 0./ 6 2,33 0.25 2,33 II-ll 0 18 2,67 0.22-2, b 7 11-12. tJ O G. H L ORl/J A-TION 11-13 o,65 100 c.2 9

f. c o il-14 O

Q D. o 2. o.50 l l- /5 o,06 f,.3 3 o. i s'

g. t G, i1-IC No 0,H lor.1 t4 ATIOM 11-l'7 0,07 0, S3 0.56-2,00 ll-I f3 61 0 0.-14 L OT2 /N AT(04/

11-19

c. t ~2_

l.o O

o. 4o 2.50 tl-to aIb

• k,16 C.41 3.50 11 - 2 1 0 0 '?

l, 6 ~J oe3 9 - 2.33 D-82 0,0 3 o,83 035' 2 od 11-23 o, I ~2 - I,c0 o.19

2.. e d ti-29 0.16 2,00 048 2,33 11-as o.18

z. 3 '3 o. 3 (=,

e, 3 o 11-2 4 EQuWW ta.u i r= A I L U P_ E 11-27 -do-11 - 2 8 O O 0.20 2.33 Il-2'9 0.01

0. fo ]

o,13 0 67 11-s o C.o l o SO

6. 4R e, t &,

I i i T I,89 .8049 6.14 4,1j l 7t/# ?-s[19 n/79 26/79 7 5/79 I avg o.e B I, 2.? o.2f I. BC j l Ad o.0 9 1.)?

0. 2.?-

2.t5

gvPS - U 6 c F i f' O. 9 1.o Ri M E S Tu bY - DA t A suMMAgy W A *R,. a-V M t. '7, 0 71 FPet C4 DUB Ail en TOTAL Cd ov r, r 1 o 4 DATE dr 4/2 ) ( 4 R '0 [m E./d } ( PRS) Q. E. M A R l<. S S P_e_ 1. o 9 to l a-I-7 7 AJ O 69 LOR IN AT l O V 12-a o.3 7., 2.33 oAo 2.33 L2-3 o./ 8 2.00 0 23 2,50 12-4 O O 0.46 s. 3 'S (2-5 O O 0,32 183 12 6 O O o.a l 1.93 12 7 O O o.4 fo 2 00 I2-b' O O 0./ b 2.00 12 -9 O O o.6 I 2 00 12-to O ~ O O O 12 -1I O O 0,32. 2.00 12-ta o O d.3 P_. 2 o c) 12-t3 O O 0,2. I

2. o C) 12 -I A

o. ll

2. co

0. l A 2.o c)

I2-us 0 o5-I.s O O o *1 f 50 12 - \\ l.

d. o 3 I.69 005~

/. 6 7 12-n 0,06 / 93 0-/ 6 / 2'3 12 -18 C) O o o 12-19 100 C)]LoE/Alf T/o/] 12-20 0,// /,6 '7 0./ 8 /. 8 3 l 12-28 0,/9 2.00 0,2. 9 '2, / Io I2-22 0</ 4

2. I 6 o.24 2.33 1223

d. / S-2,4, 7 0

2. 7_._

2.67 I2-2A

0. 0 A

/67 0,24 2.33 l 1 z-n-0,0 (, 2.00 0.27 Z 0 o' PAcrA pp m > 5 12 2G o.o 7 /.9 3 0 26 2.FC 12-29 0,0 7 2,/8 0.24 2.6 D ~ /2-23 0,0 3

2. o O 020

2. 3 ~3 12-21 d.0 2

/. 3 3 d 14 2.00 /2 30 0 Q O.05~ 0,83 12 31 o.e 3 2.00 o.24 2.ro E I.64 32 82. 6 7I Ed.80 l 7t/a+ a9//c8 2.9//og 2 9 / /ob 2.9/ /od A V C, 0.06 /. /3 0.? 3 /. 9 (, j A ve-, " 0 07 r,13 o.22. 2.t o 1

C. 9 l. o R W E STUDY - DA rA

SUMMARY

FREE Cf DURA T totl TOTAL 0. { DD9A ~TIO N oure (ms/O Curae (m/i) cussS 9.ta A n ks. S G l=_ ( o t: 10 1-I-7s o,o 3 2.CQ o.aA 2.50 l - ?_ o ll 2.00

0. ~2 3 F.67 t-3 0.I 9 2 16 0,42, 2.33 l-9 0 /. 5 "

2./ (o 042

2. /6 i-5 o 22.

2. / 6 o.25-

z. /4 l-t; o o 2.

0. S' 3 0 Z3 2.cc 1

~1 0,08. /.b ~1

o. /O

~2. 0 o I-8 0.08 /, 83 0,/2 /.S'S l-9 0.o 7 2.o D o./F 2.33 1-Io 0.04 /.80 0-/ o /.83 1-1l 6.O3 1 50 0.08 /B3 l-la 009 /,00 0.// /. 6 7 I-13 O O O.// /,23 1-19 Q O O 2s" /.s-6 I-Is E cuIP^4ENT~ p h i. P U Nc.T.70W I-IC, C O 0 39 2.00 1-17 o O o./ / /,50 l -le, ' o o 0./ 7

f. PJ I

\\-\\9 Q O

o. I O j.23 1-20 d.oo

/.E0 1.09 /.50 1-21 o o p, /4 /,f'7 l-22 o 0 0./2 /. 33 \\ \\-23 d.o E /. / 6 o,/ 3 /_ &J 1-24 0 27 f.co 0 32

2.. o o 1-as o,a1

2. o o 0,23

2. / 6 I-2 G o. 2 s '~

2.00 0 3s~ 2 oO l-22 AJ O SAM 'P L E~ s I-28 O Q O.05 /,0 & l-29 006 /,83 0, /J 2.od I-30

0. /c

/,C O_ o./ 3 2.o o 1-31 01/ 2.'00 o-/ C

2. / d>

i j-- i' E

t. 2 9 31.x s.a, ss. 9s' l

'n/7t+ 2 9/ 13') 29/ 137 24 / 137 29/ 13') l A uC, 0.08

l. l8 0.l1 l.91 l

i Aus

0. 0 ')

1,1 A

o. ?-l

2. Ole k

~ ~ " C H l.o RIM E STUDY - D A~TA s u MM A RY WAR Ju ng 7,197 6 FPCE Of T)v P6 T tot 4 TOT 41. df puptlTIoW DATE (/h?/C) (HRSD (tr'3/#) (395) T'2G /4/1R MS c S E E. t o S-t o 2-t-Je d.OS 0 b3 0,09 /,00 2-a O. lo 2.00 0lA 200 e-3

o. l o 0.83 0./s~

/. 83 1 2-A o.?o 0.83 06&

f. 8.3 2-5 o

0 0.02 0,6'7 2-f 0 07 f.83 0./ 2

2. o e 21 0 06

/. s o a.at f.67 2-S 006 2.00 oog 2.00 2-9 o.o G

t. 6 '7 a.II I. 6 3 2-Io 0.oS

/.8 3 0.at

z. oo 2-l i o.o A 2,00 0./5 2,co 2-se 0./o

/.8 3 0 13 l.82 2-13 d.02> 0.V3 0.to 0 83 2-IA

o. ll 2.00 0./T 2.0C) 2-G

0. II

/. %3 &l4 / 2 *3 e-I 6

0. o G I.53 0.08.

/. 83 2-17 0.08 /.83 O./0 /. 83 2-13 c.l'3

2. oc o./ P 2.o 0 2-M O./ 3

2. I (,

o. 2.0

2. / 4, 2-20 0.09

/, 8 3 0,14 J, &3 2-2l AJO C H 1. O R Z A.) A T.TO/y' 2 22 0.oS /, & G o,/ o 2,CO (" 2-23 0./0 z.co

o. //

2.00 2-29 d.04 /. 6 7 o,2/ /, 47 \\ 2-2c 0,04 /,6 7 6, / 6 /.83 2-26 0.02 /,6 7 0.1s-2./ 6 2-29 602 '/. 50 o,/6

2. o 0 2-2 b O

O 0.fo /.6 7 i \\ l l S Sob

41. 20 3.56 48.30 l

.?t hn+ e1//64 EJ/ /s4 a2/ /64 37//Sc i l Au C, O.08 (. 55~ o.I 5 l14 l AVG *

0. o'7 1.21 0.7 O 2 01

( _

BUPS-I T oF lb C H lor t N E STu oY - p A TA s u ra M r, e,y WAR 3 u r4 t- '7, / 9 '78 FREE. Gd OupnTioH TOTAL Of Dunnnow bh0/b bR-N hDS/d [ mph Q G M A-T2 K.S OAT E 3EE tof 10 3- \\ 'l6 0 0

o. o 4 C. 6 9 3-E

0. o ?_

/.00

o. /5-2.o 0 3-3 0.03 0.50 o,l '7

/.67 3-A o.oq /,50

0. 2.o 2.00 3-5 0.o 2 O,67 0./7 2.od 3 -(.

6,16 2./6

0. / g 2.t4 3-7 0.12 2./4.

o./ f 2,// 3-8 0 08 /.50 0.02

f. Sb 3-9 O

O

o. o-s-O.47 3-10 d. / 5~

/, 8'3

d. /,.5~

/. d 3 3 -ll 0./ 9 2.30 0.20 2,00* 1 3-la 0 31 2./ G. 0.34 z.it .3-13 0 08 f.lr3 o.12 z.oo 3-M o.06 /,6 7 0./d 2 00 3 -IS & QUT P/415/JT~ M nc p ut x T/of) 3-16 0.03 / 00 o.I b 2.00 3-T1 0 10 2./6 O. 3 o 2./ f, 3-t B

0. os' 2co 0.24 2 00 3-l9 0 06

t. l'3 0./ 9

/, 2' 3 3-20

0. o '1

l. 83 0,/f

f. 2,3 3-2\\

005' 2 00 o. z.5~ 2.00 ( 3-21 o.08 2 00 o.2 ? 2 00 3-23 6.o l teo 0 18' 2,00 3-2A 0.02' 2.00 0.33

2. /d 3-as-o, /,5-2 60 o.3 4 2.00 3-26 007

f. S'3 0 28 7,83 3-22 0 02 2-00 0 2 '?

2 00 3 -28 f)0 0 l-[ L OR /AJ A TION 3-29 0.09 2./ 4 0 3A 2- / S 3-30 0 27 2 33 0 32 2.33 3-3I 0 20 2 06 c.37 2.00 l E 2 58 A 7. l ?-

d. o8-55I2 l

[ 7t/# 29/193 29 /t43 2.9 / 19 3 E9/ (93 j Av6 0.09 (, (> 2 O. 2 i

f. 9 o Anc + n a c'7

a. 2 7 0, to 2 00

~ [3 V PS - l \\o oF 'O ) C H lor I N E StuoY - DATA S U/4 M A RY WAR 3 UrlE 9,,I M 6 Fi?tE Cl DUPfsTION TOTAL C[ DunATiou DATP (tra /d (ppsb (mg/l) { nus) pamARVS SEE [ c4 to 4- \\ ~1 % tJ O C H LO2)A)ITTIo rl 4-1 A> o C.H L OE IM A TloN A3

0. ll 2,oD o/5 2.00 A-A o.f r la b3 0 2 2.

2./ 6 A-5 0,/8 2,CO 0,27

2. M 4-4 o,20

/&3

0. 3 l 1.83 A

~7

0. l '$

(.00 0.50 /, 0 0 5 A-B O.I $ l.23 03I

l. V3 i

4 -9 0,21 1 h' 3 O,39 /,&O A -Io 0.16

f. O O o.34

/.0 0 A- \\ \\ o O O O 4 4-\\ t

0. o @

2.oc o./ 9 z.co A-\\3 0. 0 5~ 2 00 0-] 4 2-o0 4-14 0.ll 2,50 Q, 25 2.50 A-IS o.18 2.33 0.35

2. 5 6 4-IL o.tr 2.00 0 2l

2. / S A -17 0 18 2./6 0 24 2-/6 A -I S Q, /5~

2,/4, 6.2 o

2. /4 4 *19 0./O

/. 2 3

0. / 4 2.00 4 20 0./2 2.00

c. / &

2.33 4 -2. \\ o,j 4

2. co 0,2 O 2.00 4-72 A> o C H L op.x A>n, n o R

( 4-23 O,o3 /. 3 3 0.o y /.3 3 4 24 /J O 0 f4 LOT 2 i!J A T lo k/ 4-ES }JO 0 H LO L IIJn'T*l0N 4 -74

o. / b

/.50

0. W

/'50 4-27

0. /S 2.00 0.26

2. %

4-29 0./ / 2 00-02.0 2.00 4 -27 s va r lo/d OU PhC. E 4-30 STA T lok o u T A C= E i [ 2,99 4 J,13 S. Iq A 2. 45' ~ 'M /M 23 /'2/6 2 3/' 216 23/ 2/6 23/ 2/6 AVG 0,13 1,') i 0 2. ?_ /. W A uc, + _ o.as i. 3 7.- o. 2. o I.98}}