ML20064L436

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Responds to NRC 821210 Request for Addl Info Re IE Bulletin 81-03, Flow Blockage of Cooling Water to Safety-Related Sys Components by Asiatic Clams & Mussels. Black Water Contains Tannic Acid from Decaying Organic Matl
ML20064L436
Person / Time
Site: Robinson Duke Energy icon.png
Issue date: 02/08/1983
From: Furr B
CAROLINA POWER & LIGHT CO.
To: Jordan E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-SSINS-6820 IEB-81-03, IEB-81-3, LAP-83-13, NUDOCS 8302150263
Download: ML20064L436 (2)


Text

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  • LAP-83-13 Carolina Power & Light Company February 8, 1983 Director, Office of Inspection and Enforcement Attention: Mr. Edward L. Jordan, Director Division of Engineering and Quality Assurance United States Nuclear Regulatory Commission i Washington, DC 20555 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-261 LICENSE NO. DPR-23 IEB 81 FLOW BLOCKAGE OF COOLING WATER TO SAFETY COMPONENTS BY CORBICULA AND MYTILUS REQUEST FOR ADDITIONAL INFORMATION

Dear Mr. Jordan:

Carolina Pcwer & Light Company (CP&L) has received your letter dated December 10, 1982, regarding our response to IEB 81-03 for the H. B. Robinson Steam Electric Plant Unit 2 (HBR2). Your requests, with our response to each item, follow:

NRC Request "Please provide definition of " black water" and " naturally occuring low pH.""

CP&L Response Black water contains Tannic Acid from decaying organic material and has a pH of 4.5 to 5.5.

NRC Request "Please provide an assessment of intrusion potential should Corbicula sp. become established in the local environment."

CP&L Repsonse The results of nine consacutive years of biological monitoring indicate that Corbicula fluminea are not present in Robinson Impoundment, the primary cooling water source for HBR2. Since this 8302150243 830208 PDR ADOCK 05000261 G PDR 411 Fayetteville Street

  • P. O Box 1551
  • Raleigh, N. C. 27602 3-._. ..

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Edward L. Jordan clam has already invaded and established populations in most of the major drainages in the southeast, we believe that naturally occurring environmental factors have prevented C., fluminea from becoming established (possibly the low alkalinity waters.)

Biofouling of power plants typically occur when large clam populations become established. If C;, fluminea eventually become established in Robinson Impoundment waters, it appears likely that populations would remain low as is the case with other mollusk inhabiting low alkaline waters.

The regular biological sampling conducted by CP&L is capable of detecting the establishment of C. fluminea populations. The HBR2 presently is equipped with chlorination equipment capable of controlling clam populations if it becomes necessary.

If you have any further questions regarding this matter, please contact a member of the Nuclear Licensing Staf f.

Your very truly, f h. &n  %

/Er B. J. Furr Vice President Nuclear Operations DCW/pgp (6169DCW) cc: Mr. J. P. O'Reilly (NRC-RII)

Mr. G. Requa (NRC)

Mr. Steve Weise (NRC-HBR) l l

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