ML17285A393

Forwards Proposed Change to NPDES Permit WA-002515-1 Re Monitoring of Residual Chlorine in Cooling Water Blowndown. Evaluation Council Will Consider Request as Formal Permit Mod

ML17285A393
Person / Time
Site:	Columbia
Issue date:	04/10/1989
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GO2-89-058, GO2-89-58, NUDOCS 8904210169
Download: ML17285A393 (7)

Text

-ACCELERATED DISBU'DON DEMONSTRON SYSI'Eg REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:89 04210169 FACIL:50-397 AUTH. NAME WPPSS DOC.DATE: 89/04/10 Nuclear Prospect, Unzt 2, Was hang AUTHOR AFFILIATION

'on NOTARIZED: NO DOCKET Public Powe 05000397 SORENSEN,G.C. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

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SUBJECT:

Forwards proposed change to NPDES Permit WA-002515-1 re monitoring of residual chlorine in cooling water blowndown. I DISTRIBUTXON CODE: C001D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Licensing Submittal: Environmental Rept mdt & Related Correspondence ~

NOTES: S RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 4 4 PD5 PD 1 1 SAMWORTH,R 1 1 INTERNAL: ACRS 6 6 AEOD/DSP/TPAB NRR/DEST/ADE 8H 1 1 NRR/DEST/SGB 8D NRR/DREP/RPB 10 2 2 NUDOCS-ABSTRACT OC/LFMB~ 1 0 OGC/HDS2 REG FILE '

1 1 RGN5 DRSS/RPB EXTERNAL EG&G S IMPSON g F 2 2 LPDR NRC PDR 1 1 NSIC h

D NarE m) ALL RIDS RZCIPrmrS S

PLEASE HELP US K) REDUCE WASTE CXKZACI IHE DOCUMENI CONSOL 'ESKS RXM Pl-37 (EXT. 20079) KO ELIMINATE Y0UR MNE PKIH DISTIUKEZIGN LISTS H)R DOCUMENIS YOU DON'T NEZDt TOTAL NUMBER OF COPIES REQUIRED: LTTR 28 ENCL 26

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968 ~ 3000 George Washington Way ~ Richland, Washington 99352 April 10, 1989 Docket No. 50-397 G02-89-058 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station Pl-137 Washington, DC 20555

Subject:

NUCLEAR PLANT NO. 2 OPERATING LICENSE NO. NPF-21 MODIFICATION OF NPDES PERMIT

Reference:

Letter, G. C. Sorensen (Supply System) to C. Eschels (EFSEC), dated November 17, 1988.

In the referenced letter (see attached), the Supply System requested the State of Washington for relief from the continuous chlorine monitoring requirement of the WNP-2 NPDES permit. The Energy Facility Site Evaluation Council has agreed to consider this request and will treat it-as a formal permit modification. Accordingly, under the requirements of Appendix B, paragraph 3.2 of our operating license, we are providing the NRC with a copy of the proposed change.

Yery truly yours, G. C. S rensen, Manager Regulatory Programs RL/tlr Attachment cc: Mr. C. J. Bosted, Resident NRC Inspector (901A)

Mr. J. B. Martin, Region V NRC Mr. N. S. Reynolds, BCP8R Mr. R. B. Samworth, NRC Mr. D. L. Williams, BPA (399) 89042i0169 8904i0 PDR ADOCK 05000397 P PDC

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WASHINGTON PUBLIC POWER SUPPLY SYSTEM

, P.O. Box 968 ~ 3000 George Washington Way ~ Richland, Washington 99352 November 17, 1988 Mr. Curtis Eschels, Chairman Energy Facility Site Evaluation Council Mail Stop PY-ll Olympia, HA 98504

Subject:

SUPPLY SYSTEM NUCLEAR PLANT NO. 2 MONITORING OF'ESIDUAL CHLORINE IN COOLING HATER BLOHDOHN Refs: (1) NPDES Permit No. HA-002515-1, Special Condition Sl.B (2) Ltr., S. Prescott (HDOE) to HL Fitch (EFSEC), dated March 6, 1986 (3) NPDES Permit No. HA-002504-6, Special Condi6on 'Sl.B The discharge permit for HNP-2 limits the discharge concentration of'otal residual chlorine (TRC) to 0.1 mg/1 or less (Reference 1). ,The same permit condition stipulates continuous monitoring but allows grab sample analysis when the continuous monitor malfunctions. The performance of our in-line TRC monitor has been a subject of interest to" Council staff and the HDOE inspectors (see for exa'mple,, Reference 2)., Hhile the analyzer..will provide a response to a chlorine residual, its accuracy .'.and .'reliability are not sufficient to verify permit compliance."'To,'.assure compliance with the effluent limitation we have always ',used .',amper ometric <<titration of grab samples to control the blowdown authoi izatson,reprocess . ':Our ..use of grab samples is indicated each month on the Dis'char'ge 'Monitoring Report. Though the results from the continuous analy'zer .are pot .used, w'e have continued to expend resources to keep it in service"'as"Required,by the'permit. Based on our 'experience we do not believe that:this',"maintenance is practicable, nor do we believe it. is necessary ito'. assure .',.environmental protection.

Accordingly, we seek the Council s permlssi~on by'~l.ett'er'.of. interpretation, resolution, or permit modification -",~to>remove'.;.thecontinuous chlorine

• analyzer from service and to formalize ourcurrent 'practice.

4 g,

e Mr. Curtis Eschels rm November;17, ." 1988 P.age Two 'bg 41 4

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r Chlorination of the cooling water at WNP-2 is an intermittent operation, occuring two or three times per week. The procedure calls for closing the blowdown valve, adding sodium hypochlorite, and then periodically monitoring TRC. When two grab samples taken at least 15 minutes apart both indicate TRC ~ 0.1 mg/1 the Shift Manager may authorize resumption of blowdown to the river. Continuous analyzers are not well suited to this operation because: (1) chlorination is intermittent as opposed to continuous; (2) the operation requires a measurement of high sensitivity; (3) the application is one of permit compliance (as opposed to process control); and (4) high suspended solids found in the cooling water necessitate frequent, but largely ineffective, cleaning.

Continuous chlorine analyzers are used in water and wastewater disinfection where they provide feedback to the chlorinator to continuously control free chlorine residuals. The chlorine concentrations typical of wastewater disinfection processes are an order of magnitude higher than concentrations in our effluent. At WNP-2 chlorination is a batch, rather than continuous, process in which the chlorine analyzer is needed for compliance purposes only a few hours per week. It is also significant to note that, through phone conversations with staff at EPA's Environmental Monitoring and Support Laboratory in Cincinnati, we confirmed there is no continuous method . approved by the agency for monitoring TRC. (Thus, even continuous analyzer was consistently capable of meeting the sensitivity if our requirement, reliance on it for effluent monitoring might be a technical noncompliance with permit condition G10.) Because confidence is needed at the O.l mg/1 TRC level, the most suitable method for our application is analysis of grab samples by amperometric titration.

After discussions with staff at EPA, WDOE, instrument vendors, and other nuclear units, we are convinced that grab sample analysis is the most efficient and reliable method currently available. Accordingly, at the next permit renewal "window" (September 1990) we will request the Council's consideration of language 3).

it approved for the WNP-1 NPDES permit (Reference In the interim we request the Council's permission to forgo the maintenance on the continuous chlorine monitor and to rely exclusively on grab sample analysis. Please contact W.A. Kiel at SCAN 546-5381 require additional information to consider this request.

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'; Very truly yours,

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G.C. Sorensen

. "'anager, Regulatory Programs cc: RF Stanley, WDOE

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