ML20086A778

Forwards Validation of Computerized Thermal Compliance & Plume Development at Sequoyah Nuclear Plant. EPA Approval of Compliance Method Requested

ML20086A778
Person / Time
Site:	Sequoyah
Issue date:	10/14/1983
From:	Elashry M TENNESSEE VALLEY AUTHORITY
To:	Traina P ENVIRONMENTAL PROTECTION AGENCY
Shared Package
ML20086A781	List: ML20086A778 ML20086A786
References
NUDOCS 8311160108
Download: ML20086A778 (2)

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TENN E22EE VALLEY AUTHORITY KNOXVILLE. TENNESSEE 37902 u '

OCT 141983 [0 ' N Mr. Paul J. Traina, Director Division of Water Management U.S. Environmental Protection Agency, Region IV 345 Courtland Street, NE.

Atlanta, Georgia 30365

Dear Mr. Traina:

TVA SEQUOYAll NUCLEAR PLANT - NPDES PERMIT NO. TN0026450 - VALIDATION OF COMPUTERIZED THERMAL COMPLIANCE AND PLUME DEVELOPMENT In accordance with NPDES permit No. TN0026450 (Part I, page 3, footnote 5),

TVA has completed field tests to validate the numerical model that will allow us to compute thermal compliance with the Sequoyah NPDES permit. The enclosed report describes the field test and demonstrates the accuracy of the computed compliance method. The report also describes the development of the thermal plume and satisfies Part III.E of the NPDES permit.

The computed compliance method is superior to instream monitors because it actually calculates the plant-induced thermal effect at the edge of the mixing zone. The meteorological effects and the variability of the tempera-ture measurements by the monitors do not influence the computed compliance values thus allowing TVA to increase operational efficiency. The computed compliance method also allows predictive capability in that operation of the plant's cooling system can be scheduled to meet thermal limits. This method will minimize the number and duration of thermal noncompliances.

TVA would like to implement the computed compliance method as soon as possible. Accordingly, we request your early consideration and approval of this compliance mothcd. We are transmitting a copy of this report to the Tennessee Division of Water Management and request their concurrent revieu.

Wally Carpen',cr will contact Doug Lankford to set up a meeting, if necessary, to discuss any questions you may have.

Sincerely, r~

h D g Mohamed T. El-Ashry, Ph.D.

Director of Environmental Quality Enclosure (2) cc (Enclosure): See page 2 ADO ohoghhj7 1

PDR 't l

l-1983-TVA 5OTH ANNIVERSARY An Equal Opportunity Employer

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ro l e a Mr. Paul J. Traina DCT 141983 cc([Attention:

Enclosure):

irector, Nuclear Reactor Regulation Ms. E. Adensam, Chief Please excuse the delay in receiving your copy of this Licensing Branch No. 4 letter. Reproduction of the report took longer than expected.

u lear e ory Commission Washington, D.C. 20555 Mr. James P. O'Reilly Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 Regional Director (2)

U.S. Fish and Wildlife Service 75 Spring Street, SW.

Atlanta, Georgia 30303 i Mr. Lee B. Tebo, Chief

! Ecological Support Branch j U.S. Environmental Protection Agency

] College Station Road j Athens, Georgia 30601 Mr. D. Elmo Lunn, Director

, Tennessee Division of Water Management 150 Ninth Avenue, North--TERRA Building Nashville, Tennessee 37203

]

Regional Engineer Chattanooga Basin office j Tennessee Division of Water Management l 2501 Milne Street Chattanooga, Tennessee 37406 4 -

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