ML041110780

RAI Steam Generator Tube Inspection Report

ML041110780
Person / Time
Site:	Catawba
Issue date:	04/19/2004
From:	Sean Peters NRC/NRR/DLPM/LPD2
To:	Jamil D Duke Energy Corp
Peters, S, NRR/DLPM/301-415-1842
References
TAC MC1703
Download: ML041110780 (6)

Text

April 19, 2004 Mr. D. M. Jamil Vice President Catawba Nuclear Station Duke Energy Corporation 4800 Concord Road York, South Carolina 29745

SUBJECT:

CATAWBA NUCLEAR STATION, UNIT 1 RE: REQUEST FOR ADDITIONAL INFORMATION (TAC NO. MC1703)

Dear Mr. Jamil:

By letter dated December 23, 2003, Duke Energy Corporation submitted information concerning the steam generator tube inspection report for End of Core 14 at Catawba Nuclear Station, Unit 1. The Nuclear Regulatory Commission technical staff has reviewed your submittal and has determined that additional information is required for the staff to complete its review, as identified in the Enclosure.

We discussed these issues with your staff on April 1, 2004. Your staff indicated that you would attempt to provide your response by June 1, 2004.

Please contact me at (301) 415-1842, if you have any questions on these issues.

Sincerely,

/RA/

Sean E. Peters, Project Manager, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-413

Enclosure:

Request for Additional Information cc w/encl: See next page

April 19, 2004 Mr. D. M. Jamil Vice President Catawba Nuclear Station Duke Energy Corporation 4800 Concord Road York, South Carolina 29745

SUBJECT:

CATAWBA NUCLEAR STATION, UNIT 1 RE: REQUEST FOR ADDITIONAL INFORMATION (TAC NO. MC1703)

Dear Mr. Jamil:

By letter dated December 23, 2003, Duke Energy Corporation submitted information concerning the steam generator tube inspection report for End of Core 14 at Catawba Nuclear Station, Unit 1. The Nuclear Regulatory Commission technical staff has reviewed your submittal and has determined that additional information is required for the staff to complete its review, as identified in the Enclosure.

We discussed these issues with your staff on April 1, 2004. Your staff indicated that you would attempt to provide your response by June 1, 2004.

Please contact me at (301) 415-1842, if you have any questions on these issues.

Sincerely,

/RA/

Sean E. Peters, Project Manager, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-413

Enclosure:

Request for Additional Information cc w/encl: See next page DISTRIBUTION:

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REQUEST FOR ADDITIONAL INFORMATION DUKE POWER COMPANY CATAWBA NUCLEAR STATION, UNIT 1 DOCKET NO. 50-413 The Nuclear Regulatory Commission (NRC) staff has reviewed the licensees submittal dated December 23, 2003, forwarding the End of Core (EOC) 14 Steam Generator Tube Inspection Report for Catawba Nuclear Station (Catawba), Unit 1. The NRC staff has identified the following information that is needed to enable the continuation of its review.

1. The steam generators at Catawba, Unit 1, were replaced in 1996 with Babcock and Wilcox International CFR 80 steam generators. In several locations in your reports, you reference tube support structures (e.g., fan bar 4) and tube locations (e.g., Row 14 Column 55). In order for the NRC staff to better understand the location of the indications, please provide (1) a sketch of the Unit 1 steam generators which depicts the tube support naming conventions and (2) a tubesheet map which depict the rows and columns of the tubes. In addition, please provide the following general design information: tube manufacturer, tube material, tube outside diameter, tube wall thickness, tube support (including fan bar/anti-vibration bar) material and configuration, tube support (including fan bar) thickness, tube pitch and orientation (e.g., 1.1-inch triangular pitch), expansion method, and any other noteworthy design characteristics from a steam generator tube integrity standpoint (e.g., full length stress relief of the row 1 through row 10 tubes). Furthermore, discuss whether measurements from a tube support are from the middle of the support or the edge of the support. For example, does fan bar 5 minus 0.9 inches specify an indication 0.9 inches from the bottom edge of the fan bar?

2. For the EOC 14 inspections, please clarify the scope and extent of the inspections. For example, please discuss what probes were used during the inspection, how many tubes were inspected, and what portions of the tubes were inspected with these probes (e.g., 100 percent full-length inspection with a bobbin probe, rotating-probe inspection of the hot-leg expansion transition region (+/- 3 inches) for 100 percent of the inservice tubes, etc.).

3. Please clarify the results of your inspection. For example:

a. For the volumetric indications reported, please discuss the source and significance of these indications.

b. Please clarify the difference between an NQI and an NQS indication.

Enclosure

c. Please clarify the potential and actual degradation mechanisms observed in your steam generators. For example, several wear indications have been reported.

Please briefly discuss the cause of these indications and the population of tubes susceptible to these mechanisms. In addition, several tubes were inspected/classified as proximity tubes in a previous inspection. Please describe this categorization and the tubes potentially affected by this issue.

4. Seven tubes were plugged and stabilized in steam generator C as a result of a loose part that could not be removed. Please clarify the source and nature of this part. In addition, briefly summarize the corrective actions taken and your basis for the corrective actions (e.g., all steam generators were inspected, the part was surrounded by plugged and stabilized tubes and is not expected to move based on analysis, etc).

5. Several indications were reported as CHG indications. Please clarify the meaning of this acronym. Assuming this acronym implies the indication has changed, please discuss what signal characteristic changed and the cause of the change (or provide a description of actions that you may be planning to take to investigate the reason for the change). For the criteria used to determine if a signal exhibits little or no change, discuss how the criteria was determined. For example, was test repeatability evaluated for these types of indications such that the criteria would identify a signal change when the change was greater than normal test repeatability?

Catawba Nuclear Station cc:

Lee Keller, Manager North Carolina Electric Membership Corp.

Regulatory Compliance Post Office Box 27306 Duke Energy Corporation Raleigh, North Carolina 27611 4800 Concord Road York, South Carolina 29745 Senior Resident Inspector U. S. Nuclear Regulatory Commission Ms. Lisa F. Vaughn 4830 Concord Road Duke Energy Corporation York, South Carolina 29745 Mail Code - PB05E 422 South Church Street Henry Porter, Assistant Director Post Office Box 1244 Division of Waste Management Charlotte, North Carolina 28201-1244 Bureau of Land and Waste Management Dept. of Health and Environmental Control Anne Cottingham, Esquire 2600 Bull Street Winston and Strawn Columbia, South Carolina 29201-1708 1400 L Street, NW Washington, DC 20005 Mr. R. L. Gill, Jr., Manager Nuclear Regulatory Issues and North Carolina Municipal Power Industry Affairs Agency Number 1 Duke Energy Corporation 1427 Meadowwood Boulevard 526 South Church Street, Mail Stop EC05P Post Office Box 29513 Charlotte, North Carolina 28202 Raleigh, North Carolina 27626 Saluda River Electric County Manager of York County Post Office Box 929 York County Courthouse Laurens, South Carolina 29360 York, South Carolina 29745 Mr. Peter R. Harden, IV, Vice President Piedmont Municipal Power Agency Customer Relations and Sales 121 Village Drive Westinghouse Electric Company Greer, South Carolina 29651 6000 Fairview Road, 12th Floor Charlotte, North Carolina 28210 Ms. Karen E. Long Assistant Attorney General Mary Olson North Carolina Department of Justice Director of the Southeast Office Post Office Box 629 Nuclear Information and Resource Service Raleigh, North Carolina 27602 729 Haywood Road, 1-A Post Office Box 7586 NCEM REP Program Manager Asheville, North Carolina 28802 4713 Mail Service Center Raleigh, North Carolina 27699-4713

Catawba Nuclear Station cc:

Mr. T. Richard Puryear Owners Group (NCEMC)

Duke Energy Corporation 4800 Concord Road York, South Carolina 29745 Richard M. Fry, Director Division of Radiation Protection N. C. Dept. of Environment, Health, and Natural Resources 3825 Barrett Drive Raleigh, North Carolina 27609-7721 Diane Curran Harmon, Curran, Spielberg &

Eisenberg, LLP 1726 M Street, N.W., Suite 600 Washington, DC 20036