ML20248M103
| ML20248M103 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/26/1998 |
| From: | Bodine D TENNESSEE VALLEY AUTHORITY |
| To: | ENVIRONMENTAL PROTECTION AGENCY |
| References | |
| NUDOCS 9806120394 | |
| Download: ML20248M103 (3) | |
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1 Tennessee Vaney Authority Post Otttce Box 2000. Soddy-Datsy. Tennessee 37379
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May 26,1998 U.S. Emironmental Protection Agency Region IV Emergency Response and Removal Branch 61 Forsyth Street, SW Atlanta, Georgia 30303 To Whom It May Concern:
Enclosed is an Emergency Release Follow-up Notice Report for the Sodium Hypochlorite spill to an NPDES Permitted Outfall at the Sequoyah Nuclear Plant on May 18,1998 as required by 40 CFR 355.40 (b) (3). If you have any questions or comments, please contact me at (423) 843-6700.
Sincerely, t.
Debra J. Bodine Emironmental Supenisor cc:
Tennessee Emergency Management Agency 6* Floor, L&C Annex 401 Church Street Nashville, TN 37243-1534 U.S. Nuclear Regulatory Commission l
Attention: Document Control Desk One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 l
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9006120394 990526 PDR ADOCK 05000327 S
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EMERGENCY RELEASE FOLLOWUP NOTICE REPORT This is the follow-up report required by 40CFR 355(b)(3) for the sodium hypochlorite release that occurred at the Sequoyah Nuclear Plant on May 18,1998.
Business Name and Address:
Tennessee Valley Authority - Sequoyah Nuclear Plant PO Box 2000 Soddy-Daisy, TN 37379 l
l-Location ofincident:
Sequoyah Nuclear Plant is located offIgou Ferry Road in Hamilton County, Tennessee, approximately 7.5 miles northeast of Chattanooga.
Name and Phone of Emergency Contact at Sequoyah Nuclear Plant: Debra J. Bodme (423) 843-6700.
Date ofIncident:
May 18,1998 Organizations notified:
Date and Time of Notification:
National Response Center May 18,1998 at 2315 Nuclear Regulatory Commission-May 18,1998 at 2315 Tennessee Emergency Management Agency May 18,1998 at 2330 Hamilton County Emergency Management Agency May 19,1998 at 0910 Tennessee Department of Environment and Conservation May 19,1998 at 1300 Chemical Name: Sodium Hypochlorite CAS Number:
7681-52-9 Is the chemical on the Extremely Hazardous Substance (302) List? No, it is not an extremely
' hazardous substance. It is listed at 40 CFR 117, Hazardous Substances Designated Pursuant to 311 of the Clean Water Act and was released via an NPDES permitted Outfall (DSN 101) in a concentration greater than that allowed by the NPDES Permit.
Physical State of the stored substance: Liquid Physical State of the avleased substance: Dilute Liquid Tisse of Release: 1523 Duration of Release: 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 7 minutes
- Quantity Released: 151.48 Kg or 334 pounds Factors Contributing to release: Equipment Malfunction Actions Taken: System shut down. Monitoring was conducted to verify that no detectable total residual chlorine discharged from Outfall 101 to the Tennessee River.
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l Known or Anticipated Health Effects of the Release:
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- Acute or Immediate:
. None Chronic or Delayed:
None Total Injuries from Release: None Total Hospitalizations resulting from release: None Advice regarding medical attention for exposed individuals: Noindividuals were exposed to tl>e sodium hypochlorite.
Additional Information about the release:
Sodium Hypochlorite injection to the Raw Cooling Water System (RCW) was initiated on May 18,1998 at 1523. This treatment is used to control microbiologically induced corrosion, Asiatic clams and zebra mussels which can restrict cooling water flow. The treatment is limited by the SQN NPDES Permit to a calculated instantaneous maximum of 0.058 mg/L total residual chlorine (TRC) at the Diffuser Pond discharge (Outfall 101). A malfunction of the chemical injection system caused the TRC in the Raw Cooling Water System to be above normal levels. The calculated TRC at the DiJuser Pond discharge (Outfall 101) then exceeded the calculated instantaneous maximum of 0.058 mg/L. Samples were taken at the Diffuser Pot.d discharge (Outfall 101) during the release (at 1900,2100, and 2238 on May 18,1998 and at 0030 on May 19,1998) to ensure that the TRC concentration at this Outfall was less than the 0.1 mg/L analytical method limit of detection. The results of all four analyxs were less than 0.1 mg/L. The maximum amount released as sodium hypochlorite was 151.48 Kg. There were no observable adverse environmental effects. Use of the Raw Cooling Water System has been discontinued until the cause of the problem is identified and corrected. A report of the event was also submitted to the Water Pollution Division of the Chattanooga Environmental Assistance Center.
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