ML18031B192
| ML18031B192 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/13/1987 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8702180343 | |
| Download: ML18031B192 (6) | |
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ACCESSION NBR:
FAC IL:50.-259 50-260 50-29k AUTH. NAllE QRIDLEYiR.
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REGULATORY I
'MATION DISTRIBUTION SYS l'RIDS) 8702180343 DGC. DATE: 87/02/13 NOTARIZE:
NG DOCKET I Brogans Fev v g Nuc leav'ouer Stations Unit ii Tennessee 05000259 Brogans Fevrg Nucleav Paver Stations Unit 2>
Tennessee 05000260 Brogans Fevv g Nucleav Pouev Stations Unit 3i Tennessee 05000296 AUTHOR AFFILIATION Tennessee Ual leg Authoritg RECIPIENT AFFILIATION OFFice of Nuclear Reactor Regulation.
Div ec tov'post 851125 Document Contv ol Branch
<Document Control Desk)
SUBJECT:
Provides updated inFo on facilities v ae eater chlov inatiovv pv actices. Facility intends to maintain raw water sgs free of clams in most practical 0 efficient mannev possible.
Chlorination pv actices will be altered as v equired.
DISTRIBUTION CODE:
COOED DOPIER RECEIVED: LTR J ENCL Q BI ZE:
TITLE: Public Comment on Environmental Statement NOTES: Nl'lSB/FCAF 1 cg.
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TOTAL NUMBER OF COPIES REQUIRED:
LTTR 30 ENCL
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TENNESSEE VALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 5N 157B Lookout Place FEB 18 1987 U.S. Nuclear Regulatory Commission Attn:
Document Control Desk Office of Nuclear Reactor Regulation Washington, D.C.
20555 Attention:
Dr. J. Nelson Grace In the Matter of the Tennessee Valley Authority Docket Nos.
50-259 50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) 'CHLORINATION PRACTICES CORBICULA SP.
CONTROL The purpose of this letter is to provide NRC with updated information on the BFN raw water chlorination practices.
Information was previously provided to NRC in a letter from D. S.
Kammer to J.
P. O'Reilly dated March 21, 1983.
Research performed by TVA personnel specifically studying the Corbicula sp.
(Asiatic clams) has shown where beneficial changes could be made to the BFN chlorination practices.
Subsequently, appropriate changes have been made to the chlorination procedures which are used to prevent biofouling in the Emergency Equipment Cooling Mater System (EECM) and the High Pressure Fire Protection System (HPFP).
EECM S stem Chlorination Previously, chlorination of the EECM System was begun each time river temperature rose to 60 F.
We now initiate surveillance for clam larvae at that time.
Chlorination of the EECM System is started upon detection of clam larvae and ends when the river temperature falls below 60 F and no clam larvae are detected.
HPFP S stem Chlorination Previous chlorination practice pertaining to the HPFP System was to execute a
semiannual chlorination cycle of the HPFP System when river temperature rose to 70 F in the spring and fell to 70 F in the fall.
We now initiate surveillance for clam larvae when river temperature reaches 60'F in the spring and again when river temperature drops to 78 F in the fall.
Following detection of a predetermined clam larvae limit, chlorination is begun.
Each chlorination cycle lasts for three weeks.
If our surveillance indicates clam larvae is above the clam larvae limit, we continue chlorination beyond the three-week chlorination cycle.
8702180343 870213 PDR ADOCK 05000259 P
PDR Q An Equal Opportunity Employer i]p
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U.S. Nuclear Regulatory Commission FEB l 8 1887 Chlorine Concentration BFN chlorination procedures were previously designed to chlorinate the EECM System at 0.6-0.8 ppm chlox'ine and 0.4-0.5 ppm chlorine for the HPFP System.
TVA's reseaxch indicates that even lower concentrations of chlorine are toxic to both larvae and adult clams.
Oux chlorination procedures have been revised to allow BFN to chlorinate over a wider chlorine concentration range.
These procedures allow BFN to both effectively control clam infestation and to maintain the total chlorine discharge to the environs below the limit allowed by the Alabama Department of Environmental Management.
BFN intends to maintain its raw water systems free of clams in the most pxactical and efficient manner possible.
Chlorination practices will be altered as required if future research and inspections indicate a preferred method of control that is appropriate for BFN.
If you have any questions or need additional information, please get in touch with J. L. Turner at, (205) 729-2676.
Very truly yours, TENNESSEE VALLEY AUTHORITY
+. Gridley, Directox Nuclear Safety and Licensing cc:
Mr. G.
E. Gears Browns Ferry Pxoject Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue
- Bethesda, Maxyland 20814 Mr. G.
G. Zech, Director TVA Projects UPS. Nucleax'egulatory Commission 101 Marietta St.,
NW, Suite 2900 Atlanta, Georgia 30323 Bxowns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 2, P.O.
Box 311
- Athens, Alabama 35611
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