ML20199A566

Forwards Test Results of full-scale Testing of Hydrazine Testing at Millstone Station,Unit 2.Notification That All Discharges as Authorized by Temporary Authorization Were Discontinued on 971027,provided

ML20199A566
Person / Time
Site:	Millstone
Issue date:	11/07/1997
From:	Amerine D NORTHEAST NUCLEAR ENERGY CO.
To:	Gonyea D CONNECTICUT, STATE OF
Shared Package
ML20199A571	List: ML20199A566 ML20199B692
References
DBA-97-016, DBA-97-16, NUDOCS 9711180012
Download: ML20199A566 (5)

Text

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' November 7,1997 [g*N.[$lmma DBA 97-016 D11713 Mr. Donald Gonyca Water Management Bureau Department of Environmental Protection PERD 79 Elin Street Hartford, CT 06106 5127

Dear Mr. Gonyca:

Rererence 1: Temporary Authorization (TA0100104) issued by the Department of Environmental Protection dated September 15,1997.

Reference 2: Letter D11404 from S. Scace to J. Grier dated September 2,1997.

Reference 3: Temporary Authorin.tlon Renewal (TA0100104R) issued by the Department of Environmental Protection dated September 21,1997.

Reference 4: Letter from J. Blonar to D. Gonyca dated October 21,1997. ,

TEST RESULTS FOR FULL SCALf' TESTING OF IIYDRAZINE TREA FMENT AT MILLSTONE STATION DSN001H-6 Paragraph 4 (a) of the referenced Temporary Authorization (Reference 1) requircs that Northeast Nuclear Energy Company (NNECO) submit sampling and monitoring results to the Water Management Bureau of the Department of Environmental Protection

("DEP" or " Department") within two weeks of sampling / monitoring related to test treatment of wastewaters within its Condensate Polishing Facility (CPF) Waste Neutralization tanks at Unit 2. NNECO herein submits the attached reports including .

DSN 001B 6 Discharge Monitoring Report (DMR) form, Aquatic Toxicity Testing results, calibration, and initial screening /subst ; ;nt monitoring test result forms. This letter also provides notification to the Department that all discharges as authorized by the Temporary Authorization were discontinued on October 27,1997. .

Methodology -

The test treatment of CPF wastewaters containing hydrazine involved the chemical oxidation of hydrazine using hydrogen peroxide as described to the Department in NNECO's request for Temporary Authorization (Reference 2). Testing, consistent with the procedure submitted to the Department, was conducted using sodium hydroxide as necessary to maintain a pil greater than 10.3, Magnesium sulfate was added as a catalyst g[g for the reaction. Waste water pH was neutralized within the range of 6.0 - 9.0 in accordance with NNECO's current Nation.! Pollution Discharge Elimination System (NPD,E,Syermit prior to discharge.

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l Results Testing was conducted on Octcber 20,1997. Tank volume was 12,500 gallons and the initial hydrazine concentration of the CPF wastewaters was 75 ppm. An initial value of 75 ppm was selected as being representative of hydrazine concentrations which may be present in the CPF during normal plant operation. Results of the test treatment (attached) indicate the hydrazine concentration in the one test CPF tank was reduced to less than detectable levels (< 0.35 ppm) within 9.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />. The calculated hydrazine depletion rate constant was 0.57. Analysis of the CPF sump prior to discharge indicate:

- final hydrazine concentration <0.35 ppm

- final hydrogen peroxide concentration <1 ppm

- final pil 8.41

- final Nitrate concentration of 0.04 ppm

- final Nitrite concentration of 0.02 ppm

- ETA loading = 0.104 kg/ batch

- No visible oil sheen The discharge of these svastewaters resulted in no visible oil sheen, discoloration, foaming, or floating solids to the receiving waters.

Toxicity testing at DSN 001B was completed on October 26,1997, and was performed consistent with Department direction and guidance (References I and 4). Sample collection for toxicity testing was conducted before, during and after the test treatment

- wastewaters from the CPF were discharged. As discussed with the Department, a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> composite sample of DSN 001B was not reouired for toxicity testing. The survival rate of each replicate control test was equal to 100% With respect to efiluent toxicity, the applicable "No Observed Acute Effect Level"(NOAEL), pursuant to NNECO's NPDES pemiit, is greater than or equal to 100%. All samples passed, showing no toxicity.

Discussion Results show that hydrazine oxidizes in water saturated with dissolved oxygen. Testing indicates that hydrogen peroxide can effectively reduce hydrazine in the CPF sumps to less than detectable levels in a timely manner. Further, the hydrogen peroxide concentration in the wastewaters afler treatment was less than 1 ppm.

In pursuing hydrazine treatment options, NNECO persoinel have perfarmed additional laboratory testing which suggests that similar results may be achieved without the use of hydrogen peroxide as the oxidant. Preliminary laboratory testing indicates that air sparging (i.e., air injected into the sump to provide oxygenated water) in an elevated pH

i

• matrix may have the potential to replace hydrogen peroxide as the hydrazine oxidant. As ,

a follow up to these initial results, NNECO will apply for a temporary authorization to .

conduct a test treatment using air sparging in an elevated pil matrix at Unit 2. This request will be submitted shortly.

Should you have any questions, please call Mr. Paul Jacobson, Manger - Environmental .

Services Nuclear at (860) 4471791 Ext. 2335. l t

Very Truly Yours,

.,- NORTilEAST NUCLEAR ENERGY COMPANY f

( ll ~l - N D. B. Amerine [  !

Vice President - Nuclear Engineering and Support w/ attachments ec: Mr. James Grier  ;

NRC NRC Resident inspectors

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PERMIT: CT0003263 DIST: 12 TOWN.152 LOC:003 FACILITY: MILLSTONE NUCLEAR POVER STA. MAILING NAME NCRTHEAST NUCLEAR ENERGY CO. -

ADDRESS: RTE 156 ADDRESS: P. O. BOX 270 CITY, STATE, ZIP: WATERFORD. CT 06385 CITY, STATE, ZIP- HARTFORD, CT06101 CONTACT: MR. PAUL JACOBSON CONTACT: MR. PAUL JACOBSON PHONE- (860) 447-1791 Ext 2335 FHONE (860) 447-1791 Ext. 2335 If there are any changes or correctons wth your facdsty inivnduvi, please cross out kn.v.mcIinfe usuen and replace with correct inforrnaton.

THIS DMR CONSISTS OF 26 PAGES FOR THE REPORTING PERIOD STATEMENT OF ACKNOWLEDGEMENT Oct-97 I certify under penaKy of law that this document is identical in format and content to the preprinted Discharge Monitonng Report which I received from the Department of Ermronmental Protecton on: 12/22/95 I certify under penalty of law that this document and a!! attaduYmnts were prepared under my direction or supennsion in accordance with a system designed to assure that qualified personnel propedy gather and evaluate the informaton submitted. Based on my inquiry of the person or persons who manage the system, or t.%se persons direchy responsibie for gathenng the inis n win ni, the iniwn-inan submitted is, to the best of my knowledge and be-fief,

• rue, accurate and complete. I am aware that there are significant penaltes for submitting false information, including the possibdity of fine and in pimment for knowing violations.

Authonzed Official: D. B. Amenne

Title:

Vee Presdent - Nuclear Engineering and Support O f ' -

[f~) ~k7 Signature: J [ /\] M Date:

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Page 26

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STATE OF CONNECTICUT " DEPARTMENT OF ENVIRONMENTAL PROTECTION Bureau of Water Managemer:t - Discharge Monitomg Report (DMR)

KEY: CT0003263 issue: 121492 Expire: 12/14/97 Sample Month Oct-97 Average Fknv. 25.000 GPD ND = rxme detected Mon Loc- 1 WATER PRODUCTION WASTEWTR Sample Weeks:

Code Start s/m Typ Unit Parameter Mn Ave. Max. Freq 1 2 3 4 5

~

00698 091986 0/0 BC kg/d BORIC ACID 02/99 Code 9 00164 120192 0/1 T GPS FLOW, GALLONS / BATCH 11,750 01/07 11,75C 6,100 00556 120192 0/1 G mg/l OIL & GREASE FREON EXTR 01/30 00400 091986 0/0 G SU pH 8.41 01/07 8.41 00530 120192 0/1 G rng/l SOLIDS, TOTAL SUSPENDED 2.6 01/07 2.6 KEY: CT0003263 issue: 121492 Expire: 12/14/97 Sample Month May 1997 Average Fiovr. 5.760.000 GPD ND = none detected

.i.,. Mon Loc 1 NON-CONTACT COOLING WATER Sample Weeks:

Code Start s/m Typ Unit Parameter Min. Ava. Max. Freq 1 2 3 4 5

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50064 091986 0/0 G kg/d CHLORINE, FREE AVAILABLE 01/07 50064 091986 0/0 G mg/l CHLORINE, FREE AVAILABLE 01/07

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50050 120192 0/1 T MGD FLOW. IN CONDUlT OR THRU 02/99 00011 120192 0/1 I *F TEMP. DEG FAHRENHEIT 01/07 Page 14

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