ML20072H438
| ML20072H438 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 06/02/1983 |
| From: | Beckham J GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-SSINS-6820, REF-SSINS-SSINS-6 IEB-81-03, IEB-81-3, NED-83-330, NUDOCS 8306290455 | |
| Download: ML20072H438 (2) | |
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Georga Power Company 333 Pedmont Avenue Attanta. Georg a 30308 Telephone 404 526 7020 USNRC HE'M 3
^ 7. f'g n, G E O R GlA Maihng Address Post Omce Box 4545 Atlanta. Gecrgta 30302 83 JUN 13 Pll. g l Georgia Power ye soutNm e@ck spem J. T. Beckham, Jr.
%ce President and General Manager NED-83-330 Nuclear Generat.on June 2, 1983 U. S. Nuclear Regulatory Conunission
REFERENCE:
Office of Inspection and Enforcement I&E HQ: ELT Region II - Suite 2900 50-321/50-366 101 Marietta Street,IM I&E Bulletin Atlanta, Georgia 30303 81-03 A'ITENTION: Mr. James P. O'Reilly GElfrLEDEN:
Mr.
E.
L.
Jordan's (Director, Division of Ergineering and Quality Assurance, Office of Inspection and Enforcement) letter dated December 10, 1982, requested Georgia Power Conpany to provide information which was not included in our initial response to I&E Bulletin 81-03.
Our letter dated January 18, 1983, requested an extension for our response until the Unit 2 refueling outage. We hereby subnit the following information in response to that request.
As was indicated in our letter dated May 22, 1981, Corbicula Sp.
(Asiatic clam) has been found previously in the Altamaha River. River water is used at Plant Edwin I. Hatch for service water and circulatire water systems.
The fire protection system uses water from a deep well and is, therefore, not susceptible to clam infiltration.
'Ihe Mytilus Sp. (Mussel) is a salt water species and is not present in the Altamaha River in the vicinity of Plant Hatch.
During the recent refueling outage, a visual inspection was performed for a representative samle of the Unit 2 piping and systems which contain service or circulating water.
'Ihe scope of this inspection included the following:
all condenser water boxes (4), main tubine oil coolers, main generator hydrogen coolers, Alterex cooler, generator stator water coolers, turbine hydraulic control system coolers and the Residual Heat Removal Heat Exchangers.
A small amount of silt and organic detritus was found, but there was no evidence of clam infestation.
We were unable to visually inspect the drywell fans chiller cooling coils due to their physical configuration. However, correct flow rates through the syste'n were verified.
Adult clams, if present would be stopped by screens at the intake structure.
Due to the small size of clam larvae, the potential for intrusion is a constant possibility.
Larvae are controlled by chlorination of the service water and circulating water systems.
The service water systems usually attain about a 0.3 ppm chlorine residual. Circulating water systems are presently chlorinated up to three times a day for approximately 8306290455 830602 PDR ADOCK 05000321 G
PDR T Elbi
Georgia Power A United States Naclear Regulatory Conmission Office of Inspection and Enforcement - Region II Mr. James P. O'Reilly June 2, 1983 Page Two thirty minutes each time and usually attain a maximum residual of 0.2 ppm chlorine.
'Ihe backup to chlorination is mechanical cleaning methods.
Physical means of detection include periodic inspections and routine dismantling for maintenance and repairs.
If any organisms or organic foulire are present, appropriate action will be taken. The existing program appears to be effective in detecting any biological fouling and its use will be continued.
Instrumentation to measure differential pressure (dP) and differential tenperature (dT) exists on all of the systems noted above except the drywell fan chiller cooling coil.
The main condenser water boxes' dP is normally displayed in the Control Mom. Measurements of dP and dT across the other systems are taken routinely.
At the time of operation prior to the current outage the measured differentials were noted to be normal for all systems.
If you have any questions in this regard, please contact this office.
J. T. Beckham, Jr. states that he is Vice President of Georgia Power Company and is authorized to execute this oath on behalf of Georgia Power Conpany, and that to the best of his knowledge and belief the facts set forth in this letter are true.
GEDFGIA POWER COMPANY By:
g J. T. Beckham, Jf.
Sqrn to arx1 subscribed before me this 2nd day of June,1983.
I
_it M Notary PuNrc, Gcgis, State at Large Notary Public My Comm:ssion Egns Aug.26,1986 l
CT/mb Enclosure xc:
H. C. Nix, Jr.
(
Senior Resident Inspector i
J. F. Stolz - Nuclear Reactor Regulation, ORB-4, NBC, Washington, DC Director, Office of Inspection and Enforcement, NBC, Washington, DC l
TC0775
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