ML20246H636
| ML20246H636 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/29/1989 |
| From: | Shell R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8909010318 | |
| Download: ML20246H636 (3) | |
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,. ~4 TENNESSEE VALLEY AUTHORITY -
' CHATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place-AUS 291989 s
U.S. Nuclear Regulatory Commisston ATTN: Documer.t Control Desk Washington, D.C.
20555' Gentlemen:
In the-Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) UNITS 1 AND 2 - APPENDIX B,-ENVIRONMENTAL TECHNICAL SPECIFICATION - FISHKILL Enclosed is TVA's report of the August 2, 1989, fishkill in accordance with the requirements in Appendix B, Environmental Technical Specification, Subsect?ons 4.1.1 and 5.4.2.
If you have any questions concerning this submittal, please-telephone M. A. Cooper at (615) 843-6651.
Very truly yours.
TENNESSEE VALLEY AUTHORITY t
nager, Nuclear Licensing and Regulatory Affairs Enclosure cc: See page 2 s
8909010318 890829 A
ADOCK0500g{7
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+ U.S. Nuclear Regulatory Commission AUS 291989 j
cc (Enclosure):-
.Ms..S. C.. Black,. Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint,. North 11555 Rockville Pike Rockville, Maryland 20852.
Mr. Philip L. Stewart, Manager Chattanooga Field Office Office of Water Pollution Control 2501 Milne Avenue:
Chattanooga, Tennessee '37406-3399 Mr. B. A. Wilson, Assistant Director for Inspection Programs-TVA Projects Division.
U.S. Nuclear Regulatory Commission Region II' 101 Marietta Street,' NW, Suite 2900 Atlanta, Georgia 30323 Mr. David Young, Fish Habitat Biologist Tennessee Wildlife Resources Agency 216 East Penfield Street Crossv111e, Tennessee 38555 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road.
Soddy Daisy, Tennessee 37379
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FNCLOSURE N
.On' Wednesday, August 2, 1989, SQN personnel reported approximately 80 dead fish'in the plant diffuser pond. This event was reported to the state of-Tennessee Office of Water Pollution Control and to NRC as required by SQN Environmental Technical Specifications..At the time of the discovery, the plant was operating with both units at approximately 100 percent power and in full compliance with the National Pollutant Discharge Elimination System's
. permit. : Preliminary analysis results yielded a pH of 7.4, dissolved oxygen ranging from 5.5 to 5.2 milligrams'per liter (mg/1), and. temperatures ranging from-103.5. degrees Fahrenheit (F) to 102.7 degrees F.
On August 3, 1989, the investigation continued, and TVA personnel were accompanied by Ann McGregor, of the. Tennessee Office of Hater Pollution
-rontrol, and David Young, of the Tennessee Wildlife Resources Agency.
As. McGregor measured temperatures, dissolved oxygen, and pH at several points in the pond; The temperatures ranged from 103.1 degrees F to 100.4 degrees F, dissolved oxygen ranged from 6.2 mg/l to 5.8 mg/1, and pH ranged from 7.3 to 6.8.
Approximately 520 dead fish were observed.
The official. count identified 507 shad, 2 bass, and 11 channel catfish.
The condenser cooling water is discharged into.the diffuser pond.
During normal two-unit ooen mode operation, the temperature of this water is allowed by TVA's state discharge permit to rise to 112.5 degrees F.
On August 2, 1989, the water was measured at 103 degrees F and had been almost tnat hot for several days. At these temperatures, it is expected that weaker fish will die.
The root cause of the fishkill was hot water.
Small fish can pass from Chickamauga Reservoir through the 2-inch-diameter diffuser ports into the diffuser pond and grow during cool seasons or during long periods of plante shutdown.
Then, with normal summertime two-unit operation, water temperatures in the pond may rise to 112.5 degrees F.
The rise during this event was to 103 degrees F, which was too hot for these fish to survive.
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