ML15112A533
| ML15112A533 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 12/02/1997 |
| From: | Labarge D NRC (Affiliation Not Assigned) |
| To: | Mccollum W DUKE POWER CO. |
| References | |
| NUDOCS 9712090181 | |
| Download: ML15112A533 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 2, 1997 Mr. W. R. McCollum Vice President, Oconee Site Duke Energy Corporation P. 0. Box 1439 Seneca, SC 29679
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING THE RESULTS OF STEAM GENERATOR INSPECTION OF 1997 AT OCONEE UNIT 1
Dear Mr. McCollum:
As a result of steam generator inspections performed at the Oconee Nuclear Station, Unit 1, during the fall 1997 refueling outage, Duke Energy Corporation (Duke) identified inside diameter intergranular attack (ID IGA) degradation in approximately 1900 tubes in the upper tubesheet of the "l B" once-through steam generator (OTSG). Duke confirmed the degradation mechanism by destructive examination of five pulled tube specimens containing these indications. The staff believes that this ID IGA degradation is unique in that it is not ordinarily found in OTSGs.
By letter dated October 20, 1997, and supplemental information supplied in letters dated November 3, November 6, and November 10, 1997, Duke requested an amendment to the Technical Specifications (TS) for the Oconee Nuclear Station Units 1, 2, and 3. The amendment proposed to use a reroll process to repair the degraded steam generator tubes in the upper tubesheet. This process effectively removed the degradation from the primary-to secondary pressure boundary. The amendment was approved on November 21, 1997.
In order to address technical concerns with the nature of this mode of steam generator tube degradation, the staff would like to perform an independent assessment of the eddy current data for the ID IGA indications in the pulled tube specimens from steam generator 1 B.
Therefore, we request that Duke submit (1) an optical disk containing the eddy current inspection data (e.g., bobbin coil, rotating pancake coil, Plus Point, etc.) for the ID IGA indications in the pulled tube specimens; (2) files on the optical disk with the setup used by the analyst for examining the indications; (3) a drawing or description of the standard used to calibrate the acquisition system; (4) eddy current data from 20 randomly selected tubes that 7 12 0 iiC*
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-2 contain ID IGA indications; and (5) a listing of the dimensions of the ID IGA indications (i.e.,
length, width, depth) as determined from the destructive examination of the pulled tube specimens. The staff requests that the format for the eddy current data be compatible with Eddynet95 Analysis software.
Sincerely, David E. LaBarge, Senior Project Manager Project Directorate 11-2 Division of Reactor Projects - 1/II Office of Nuclear Reactor Regulation Docket No. 50-269 cc: See next page
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December 2, 1997 contain ID IGA indications; and (5) a listing of the dimensions of the ID IGA indications (i.e.,
length, width, depth) as determined from the destructive examination of the pulled tube specimens. The staff requests that the format for the eddy current data be compatible with Eddynet95 Analysis software.
Sincerely, ORIGINAL SIGNED BY:
David E. LaBarge, Senior Project Manager Project Directorate 11-2 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation Docket No. 50-269 cc: See next page Distribution:
PUBLIC PD 11-2 Rdg.
BBoger HBerkow LBerry DLaBarge OGC ACRS JJohnson, RII COgle, RII Document Name: G:\\OCONEElOCO99779.INF To receive a copy of this document, indicate in the box: "C" = Copy without attachmentlenc ure "E" = Copy with attachmeritlenclosure "N" = No copy OFFICE PDI -
PDll-2/I pC(--
PDll-2/D NAME D bte:cn ryHBerko DATE (2/
--197 2/ 3.97
/97T 1-1 19 OFFICIAL RECORD COPY
Oconee Nuclear Station cc:
Mr. Paul R. Newton Mr. J. E. Burchfield Legal Department (PBO5E)
Compliance Manager Duke Energy Corporation Duke Energy Corporation 422 South Church Street Oconee Nuclear Site Charlotte, North Carolina 28242 P. 0. Box 1439 Seneca, South Carolina 29679 J. Michael McGarry, Ill, Esquire Winston and Strawn Ms. Karen E. Long 1400 L Street, NW.
Assistant Attorney General Washington, DC 20005 North Carolina Department of Justice Mr. Robert B. Borsum P. 0. Box 629 Framatome Technologies Raleigh, North Carolina 27602 Suite 525 1700 Rockville Pike Mr. G. A. Copp Rockville, Maryland 20852-1631 Licensing - ECOSO Duke Energy Corporation Manager, LIS 526 South Church Street NUS Corporation Charlotte, North Carolina 28242-0001 2650 McCormick Drive, 3rd Floor Clearwater, Florida 34619-1035 Mr. Richard M. Fry, Director Division of Radiation Protection Senior Resident Inspector North Carolina Department of U. S. Nuclear Regulatory Environment, Health, and Commission Natural Resources 7812B Rochester Highway 3825 Barrett Drive Seneca, South Carolina 29672 Raleigh, North Carolina 27609-7721 Regional Administrator, Region II U. S. Nuclear Regulatory Commission Atlanta Federal Center 61 Forsyth Street, S.W., Suite 23T85 Atlanta, Georgia 30303 Max Batavia, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 County Supervisor of Oconee County Walhalla, South Carolina 29621