ML20246C613
| ML20246C613 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/30/1989 |
| From: | Bradham O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Walter C SOUTH CAROLINA, STATE OF |
| Shared Package | |
| ML20246C614 | List: |
| References | |
| NUDOCS 8907110081 | |
| Download: ML20246C613 (2) | |
Text
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. s, South Carolina Ettetric & Gas Company
- Ollie S, Bridham i
ke vi SC D9065 uclear p nons SCE&G
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June 30, 1989 Ms.'C. W. Walters Industrial and Agricultural Waste Water Division South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201
Subject:
Virgil C. Summer Nuclear Station NPDES Permit No. SC0030856 Amendment of the Permit Renewal
Dear Ms. Walters:
South Carolina Electric and Gas Company (SCE&G) submitted the renewal application for NPDES Permit #SC0030856 on December 30, 1988. This submittal contained a reaffirmation of the 316(a) waiver and a draft report prepared by NUS Corporation on the thermal. plume for the facility.
Since this report has been finalized by NUS, it is requested that the attachivent to this letter be inserted in place of our previously submitted 316(a) reaffirmation.
Should you require additional information relative to this request or the SCE&G renewal application, please contact Mr. Charles McKinney of my staff at 345-4723.
Very truly yours, O. S. Bradham DCP/OSB:grs Enclosure c:
J. L. Skolds w/oenclosure)
M. D. Quinton w/o enclosure)
W. R. Baehr w/oenclosure)
L. A. Blue.
(w/oenclosure)
W. F. Bacon w/ enclosure)
S. E. Summer w/ enclosure)
J. K. Todd w/ enclosure) t NSRC
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, Document Control.NRC~
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NPCF (w/ enclosure)
CCol File (814.07-1)
(w/ enclosure) 8907110081 890630 PDR ADOCK 05000395 P
FDC l
Reaffirmation of 316(a)
The effects of thermal discharges from the V.
C.
Summer Nuclear Station l
(VCSNS) on Monticello Reservoir have been described in detail in
{
preoperational and operational reports prepared by Dames & Moore and submitted to DHEC.-
The thermal dynamics of Monticello Reservoir have been described in thermal mapping study reports and computer mathematical model reports prepared by NUS corporation (also submitted to DHEC).
Previous studies indicate that plant power level and site meteorology are the primary factors influencing the size of the thermal plume in Monticello Reservoir.
At the request of DHEC in a letter to 0. W. Dixon, Jr. from R. A. Kennedy dated October 28, 1985, the computer model describing the thermal regime in Monticello Reservoir was re-run using more recent meteorology, Fairfield Pumped Storage Facility (FPSF) operational history, and VCSNS operational history.
Lake temperature data from the monitors at FPSF and the northern und of Monticello Reservoir were available.
The attached report prepared by NUS Corporation contains a discussion of methodology, data
- inputs, assumptions, and results.
The tables presented at the end of the report will be used to produce equations to calculate plume surface area for the Discharge Monitoring Reports.
The results of this second computer model run indicate that thermal limits for Monticello Reservoir (plume area, plume temperature and plume temperature rise) will not be exceeded.
As this computer model run agrees exceptionally well with the previous run, SCE&G requests that the model be run again only if significant changes in site meteorology, significant increase in plant power level, or major changes in plant cooling system design occur.
The model could also be re-run if the average plume temperature or plume temperature rise consistently exceeds the permit limit.
There has been no indication, with the exception of limited fish kills in the VCSNS circulating water discharge canal, that thermal discharges from VCSNS have any deleterious effects on the biota of Monticello Reservoir.
Actions to decrease fish kills in the VCSNS circulating water discharge canal are being evaluated in response to W. R. Krecker's letter of December 7, 1988.
i