ML15113A392
| ML15113A392 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/23/1997 |
| From: | Labarge D NRC (Affiliation Not Assigned) |
| To: | Mccollum W DUKE POWER CO. |
| References | |
| GL-85-20, TAC-M98454, NUDOCS 9711040189 | |
| Download: ML15113A392 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 23, 1997 Mr. W. R. McCollum Vice President, Oconee Site Duke Energy Corporation P. 0. Box 1439 Seneca, SC 29679
SUBJECT:
HIGH PRESSURE INJECTION SYSTEM AUGMENTED INSERVICE INSPECTION PROGRAM - OCONEE NUCLEAR STATION UNITS 1, 2, AND 3 (TAC NO. M98454)
Dear Mr. McCollum:
In April 1997, cracks were found in the pipe-to-safe-end weld and adjacent piping in the Oconee Unit 2 High Pressure Injection (HPI) System makeup and injection lines. One of the root causes of this condition was a failure of an augmented inspection (11) program designed to detect such cracks before leakage occurred. Subsequent inspections and corrective actions were conducted at Oconee Units 2 and 3. The ultrasonic examinations of this area of piping, and the safe-end base metal and pipe-to-valve weld on the Unit 1 HPI system injection lines, were performed in June 1997 to meet the requirements of the 1992 Edition with the 1993 Addenda of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (ASME Code),Section XI, Appendix VIII. The HPI nozzles and HPI nozzles inner radii were ultrasonically examined to meet the requirements of the I 89 Edition of the ASME Code Section XI, Appendix I. The HPI safe-end-to-HPI nozzle weld was ultrasonically examined to meet the requirements of the 1989 Edition of the ASME Code,Section XI, Appendix Ill.
On September 4, 1997, a teleconference was held between the staff and Duke Energy Corporation (Duke) to discuss the failure of the 11 program at Oconee Units 1, 2, and 3, and measures that would be taken at Oconee to correct the problem.
By letter dated August 6, 1997, Duke provided, in response to a staff request for information made during the teleconference, a revision to the Oconee third interval 10-year ISI program.
This revision enhances and clarifies the general requirements of the Oconee ISI program, and also commits Duke to meet or exceed the requirements previously committed to in Generic Letter (GL) 85-20 regarding examination of HPI System components. By letter dated September 10, 1997, Duke provided additional information concerning the ultrasonic inspection procedures used in the examination of the HPI System components at Oconee Unit 1 during a cold shutdown on June 13, 1997.
The staff has reviewed the submittals and determined that the proposed augmentation of the third interval 10-year ISI program related to the HPI examinations is acceptable. The staff noted that, in accordance with the ISI program requirements, the fourth interval 10-year ISI program for the three Oconee units will be submitted 6 months prior to the start of the fourth interval 10-year ISI program. The fourth interval program will be reviewed by the staff when it is submitted.
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October 23, 1997 In addition, the staff has determined that these examinations satisfy the Oconee Unit 1 HPI ultrasonic examination commitment for inspection during the current Unit 1 refueling outage.
However, the staff requests that you provide a commitment to perform all future ultrasonic examinations to meet the requirements of the 1992 Edition with the 1993 Addenda of the ASME Code,Section XI, Appendix VIII, or use calibration blocks (for inspection of the HPI nozzles, HPI nozzles inner radii, and HPI safe-end-to HPI nozzle weld) with cracks that simulate the type of crack observed in Oconee Unit 2.
Sincerely, ORIGINAL SIGNED BY:
David E. LaBarge, Senior Project Manager Project Directorate 11-2 Division of Reactor Projects - 1/II Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287 cc: See next page Distribution:
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W. R. McCollum
-2 In addition, the staff has determined that these examinations satisfy the Oconee Unit 1 HPI ultrasonic examination commitment for inspection during the current Unit 1 refueling outage.
However, the staff requests that you provide a commitment to perform all future ultrasonic examinations to meet the requirements of the 1992 Edition with the 1993 Addenda of the ASME Code,Section XI, Appendix VIII, or use calibration blocks (for inspection of the HPI nozzles, HPI nozzles inner radii, and HPI safe-end-to HPI nozzle weld) with cracks that simulate the type of crack observed in Oconee Unit 2.
Sincerely, David E. LaBarge, Senior Project Manager Project Directorate 11-2 Division of Reactor Projects - III Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287 cc: See next page
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, III, 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 - ECO50 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