ML20151Q250

Noncompliance Notification:On 880711,approx 1,500 Dead Fish Discovered in Diffuser Pond.Species Killed Were Threadfin & Gizzard Shad.Caused by Thermal Stress.Fish Removed & Allowed to Decay in Place

ML20151Q250
Person / Time
Site:	Sequoyah
Issue date:	08/03/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8808110085
Download: ML20151Q250 (3)

Text

J TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 SH 157B Lookout Place AUS 031988 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of I Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAll NUCLEAR PLANT (SQN) UNITS 1 AND 2 - APPENDIX B, '"iVIRONMENTAL TECllNICAL SPECIFICATION - FISliKILL Enclosed is TVA's follow-up ';cport to the July 11, 1988 fishkill in accordance with the requirements in Appendix B, Environmental Technical Specifications, subsections 4.1.1 and 5..".2.

The initial notification required by subsection 5.4.2.a was made by telephone to C. F. Gould at approximately 1235 eastern daylight time, July 12, 1988.

If u have any questions, please telephone M. A. Cooper at (615) 870-6549.

Very truly yours, TENNESSE53 VALLEY AUT110RITY M R. Gridley, Manager Nuclear Licensing and i Regulatory Affairs I l

Enclosure ec: See page 2 1

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'I 8808110085 880803  :

PDR ADOCK 05000327 S PDC An Equal Opportunity Employer

U.S. Nuclear Regulatory Commission

/ thB 031988 cc (Enclosure):

Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatoty Commission One White Flint, North 11555 kockvillo Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marictla Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Philip L. Stewart, Manager Chattanooga Fiel.. Office Office of Water Pollution control l 2501 Milne Avenue Chattanooga, Tennessee 37406-3399 l l

Mr. David Young, Fish Habitat Biologist i Tennessee Wildlife Resources Agency

( 216 East Penfield Street l Crossville, Tennessee 38555 1

1 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379

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• ENCLOSURE l

On July 11, 1988, approximately 1,500 dead fish were discovered in the dif fuser pond. This event was reported to the State of Tennessee Division of Water Pollution Control and URC as required by SQN Environmental Technical j Specifications. The total number of dead fish was subsequently revised to between 10,000 and 11,000. The species killed were threadfin and gizzard shad ranging from 2 to 4 inches in length with 3 inches dominating. A TVA l

biologist investigated this event and concluded the apparent cause for the fishkill was thermal stress. This conclusion was based on the following facts and observations:

1. Shad are particularly sensitive to temperature changes and high water temperatures.

2. Large sunfish were observed feeding on the dead shad and did not appa.c to be strassed.

3. If any toxic substances had entered the diffuser pond, this would have occurred via the yard drainage pond or low-volume waste treatment pond.

Both of these ponds support fish populations; however, .here was no evidence of fish distress.

4. The daily maximum dif fuser pond discharge temperatures for July 10, 11, and 12 were 91.4 degrees Fahrenheit (F), 91.2 degrees F, and 90.5 degrees F respectively.

The dead fish were not removed from the pond but were allowed to decay 'n place. There is no further corrective action planned for this inciden:..

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