ML20041A156

Requests Elimination of Requirement for Daily Chlorine Grab Sampling in Cooling Tower Blowdown Discharge Line.Special Condition 9 of NPDES Permit PA 0025615 Which Formed Basis for Tech Specs 2.3.1 Has Been Satisfied

ML20041A156
Person / Time
Site:	Beaver Valley
Issue date:	02/10/1982
From:	Carey J DUQUESNE LIGHT CO.
To:	Varga S Office of Nuclear Reactor Regulation
References
TAC-48012, NUDOCS 8202190180
Download: ML20041A156 (19)

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M 912sse 6000 43$ Siath Avenue Pittsbutgh. Pa.

's2te February 10, 1962

_, Director of Nuclear Reactor Regulation

-United States Nuclear Regulatory Commission S

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Attn:

Mr. Steven A. Varga, Chief N

Operating Reactors Branch No. 1 Division of Licensing-RECEIVED g

Washington, DC 20555 6-FEB r81982> r

Reference:

Beaver Valley Power Station, Unit No. 1 3"

NIRuit ussurasung 9 Docket No. 50-334, License No. DPR-66 Issum mung e Request to Eliminate Daily Chlorine Grab Sample b

Centlemen:

m We request that the requirement for daily chlorine grab sampling in the cooling tower blowdown discharge line be eliminated. This request is in regard to Section 2.3.1 of Appendix B of the Beaver Valley Power Station, Unit No.1 Technical Specifications which states that "Once a correlation between the readings of the chlorine monitor at the condenser discharge and the concentration at the cooling tower basin has been established, the need to perform a daily grab sample at the discharge may be eliminated with the staff's approval." A summary of the correlation data is attached for your review.

By letter dated July 20, 1978, Duquesne Light Company submitted the results of the Chlorine Trailing Out Study to the Environmental Protection Agency.

Page 1 of this surrmary states that "A correlation was also developed between the free avail-able chlorine residual as determined by the continuous Chlorine Monitor (WT-AN-2),

sampling at the cordenser discharge, and the free available and/or total chlorine residual sampled at the cooling tower basin and the discharge structure."

Since this correlation has been established, the requirement of Special Condition 9 of NPDES Permit No. PA 0025615 which formed the basis for Technical Specification 2.3.1 has been satisfied.

Sampling at the cooling tower basin can then be discon-tinued on a daily basis, but will be used in the event data cannot be obtained from the recorder (CLA-CW-101) at the discharge structure or the recorder at the condenser outlet (WT-AN-2).

The OSC and ORC have reviewed this request and have determined that no unreviewed safety implications are associated with this change and that these changes do not constitute an unreviewed safety question.

If you have any questions regarding this response, please contact my office.

Very truly yours, DV 0

a. a. Carey 8202190100 820210

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$5 g Vice President, Nuclear DR ADOCK 05000334 p

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Beaver Valley. Power: Station, Unit No. l Docket No. 50-334,- License No. DPR-66

-Request-to Eliminate Daily = Chlorine Grab' Sample

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~ cc: United States Nuclear: Regulatory. Commission Attn: Ifr. D. _ A. Chaney, ' Project ' Manager' Operating _ Reactors Branch No. 1 Division-of. Licensing j.

Washington, DC 20555 Mr. D.-A..Beckman, Resident Inspector U. S.' Nuclear Regulatory Commission Beaver' Valley Power Station Shippingport,_.PA 15077-U. S. Nuclear Regulatory Commission-c/o Document' Management Branch Washington,.DC 20555 4

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July 20, 1978 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 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 cime 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.

l 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-l dition No. 10 be deleted from the subject permit.

If you have i

any questions, please contact this office.

Very truly yours, A

• W ROBERY J.

McALLISTER l

Structural Engineer Enclosure i

cc:

II. A. VanWassen G. W. Moore (3)

S. L. Pernick G. F. liickel (2)

F. J. Dissert L. W. Johnson R. J. Monroc J. H. Latshaw ALL W/ATTACli.

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I DUQUESNE LICllT 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 Environnental 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 insuf ficient 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 gran'ted 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 approaching the maximum allowable concentrations of free available chlorine in the cooling tower blowdown.

The study wus 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 [VT-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 laboratory sample panel in perallel 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 free 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.

CHLOltINATION S111DY (continued)

The data collected does indicate a trailing-out of boti. free availabic and total residual chlorinc.

During normal power operation and station outages, the trailing-out lasted Icss than five hours af ter residuals were first detected at the outfall structure.

Longer trailing-out periods were noted when a plant " trip" occurred during chlorination. Althcugh detailed censurements 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 af ter 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 could cause a loss of 7 megawatts electrical.

Since the station has been chlorincting at the maximum dose rate possible during the last year, chlorinacion at this dose rate should be maintained to prevent further degradation of cicctrical generation capacity i

In conclusion, the study showed the following:

1.

A correlation does exist between the free available chlorine residual as determined by the continuous chlorine conitor (UI-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

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hours during power operation and cay reach eight hours if a plant trip occurred during chlorination.

4 Chlorination during power operation at the maximum dose rate possible l

results in concentrations of free available chlorine well below the i

limits of NPDES Permit No. PA 0025615.

Chlorination at the maximum l

dose rate must be continued to prevent more rapid fouling of the main unit condenser.

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FREE ce" ovna7li$ TcrrAL ChDui2AT16A DATE (ma /eh (9 RS) m e /1_

(u.dsh RP_ M Ar R l)

R E/A AR M q.1-77 Mo SAM PL ES - G TNr.oM OUT AGE 9-2 93 4-4 q -s-9-4 9-7 9-8 9-9 q-to 9-1) 9 -12 r

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10- 14 10-IS 10-16 10-17 lo-l8 IO-M 10-20 I0-2. I l

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10-23 10-2A

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lo *25 10 *2 l 10- 2 7 10~ 28 O -29 to-30 lo-31 Y

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2,00

!!-10 0,/ 6 2,33 0,2r 2,33 Il-lI o.18 2, 6 '1 o,22.

2,6 ~)

11 -1 2.

}J o G H LcRWFFIot4 (1-13 o,6 T l,co o,29

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o So l1-15 0,06 l.33 0 15' g.16 11-IC No c.,H lor.I ta ATrora 11-17 0.o 7 o,83 o.SS-

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1,C O o.'59

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O o.20 2.33 ll-2 9

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6. 49 e,16 i

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2-5 ['21 n/ lq

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r7,19 1 FPcc ol GUP.6T1oN TOTAL CG.

cunn rio4 DATE

/t/i)

( MRO

[m E./2)

( HRU R E M AR I<. S S atz. 1.

o 41o la-t r 1 Afo-G y t_on IN ATIo V 12-a o.3 P-,

2.33 oAo 2.33 12-3 o./ 8

2. oo 0.23 2.60 12-4 o

O o. 4 (o 3.3 'b (2-5 O

O 0,32 1, 92 3 s

12 4.

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2. l, 7 12-2A 0,04

/67 0,24 2.33 Iz 25 0,06 2.00 o.27 2.c3 c' PACEM PA' Me' S 12-24 o,o 7

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/2-23 0,0 3

.2. o O o20 2.33 12-21 002.

/. 3.3 d /4 2.00 12 30 0

0 0.07 0,83 12-3 1 0.o 3 2.c o o.24 250-1 l.64 3282.

6 7I CS80 l

l l

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2. / 6 0,42, 2.33 I-9 0./ E 2./ (o 0.49

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2. / S I

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^ 6 OF (J C H L.oR i t4 E STUDY

'D ATA S U M/4 6 RY WAR

'JU N !! '7,1971 FHCC of DuPo Ticx4 hcTilt. df DupATtov DATE

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0. o !)

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2-a o.lo 2.00

o. I A 2.o 0 2-3 01o a.83 0 ts~

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2-5 o

O o.02 0,67 2-f-0 07 f83 c./ 2

2. o 0 2-n 0 06

f. s o a.al

f. 67 2-S 006 2.00 o09 2.00 2-9 o.o 6

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2. co 2-II o.o A 2.00 O. /s 2,co 2-12 0 fo

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0,67 0 12 2.00 3 -(.

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~/-50 0 02'

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t. 73 0./ 9

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2 58 A 7.12.

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2.9/193 29 /t43 2.9 / 14 3 2.9 / 19 3 A t/ 6 0.09 l. 6 R, O.21 f.9 o

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f. 3 3 0.04

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4 -24 0./ 6

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g6~b 4-27

0. /5' 2.00 0.26 2./S l

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2,99 4 ),13 S Iq 42.9 6

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o.z. o I.98

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