ML031750004
| ML031750004 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 06/24/2003 |
| From: | Donohew J NRC/NRR/DLPM/LPD4 |
| To: | Randolph G Union Electric Co |
| Donohew J N, NRR/DLPM,415-1307 | |
| References | |
| TAC MB8103 | |
| Download: ML031750004 (7) | |
Text
June 24, 2003 Mr. Garry L. Randolph Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251
SUBJECT:
CALLAWAY PLANT, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION ON THE NOVEMBER 2002 STEAM GENERATOR TUBE INSPECTION REPORT (TAC NO. MB8103)
Dear Mr. Randolph:
In the letters dated November 19, 2002 (ULNRC-04776 and -04778), November 21, 2002 (ULNRC-04777) and March 17, 2003 (ULNRC-04823), you submitted information on the results of the November 2002 steam generator inservice inspections performed at the Callaway Plant during the twelfth refueling outage. The letter dated March 17, 2003, provided the final report on the inspections. The staff has reviewed these letters and identified additional information needed to complete its review of the report attached to March 17, 2003, letter.
The enclosed questions were provided to your staff by e-mail on June 17, 2003, and it was agreed that a response would be provided within 60 days of receipt of this letter.
Sincerely,
/RA/
Jack Donohew, Senior Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-483
Enclosure:
Questions cc w/encl: See next page
ML031750004 NRR-088 OFFICE PDIV-2/PM PDIV-2/LA PDIV-2/SC NAME JDonohew EPeyton RGramm for SDembek DATE 6/19/2003 6/18/03 6/23/03 DOCUMENT NAME: G:\\PDIV-2\\Callaway\\RAI-MB8103-SG Tube inspection results.cw.wpd
REQUEST FOR ADDITIONAL INFORMATION NOVEMBER 2003 STEAM GENERATOR INSPECTION REPORT UNION ELECTRIC COMPANY CALLAWAY PLANT, UNIT 1 DOCKET NO. 50-483 The results of the Callaway Plant 2002 steam generator tube inspections were reported to the NRC in letters dated November 19 and 21, 2002, and March 17, 2003. In order for the staff to complete its review, responses to the following questions are needed:
1.
Thermally treated Alloy 600 tubes were plugged both in Steam Generator A (Row 1, Column 34) and Steam Generator D (Row 5, Column 70). These tubes were plugged as a result of detecting volumetric indications. Please discuss the cause and the size (length, depth) of these indications. Address the implications of these findings including the technical basis for your conclusions regarding the cause of the indications (e.g., tube pull results, etc.).
2.
Several mill annealed tubes in SG A were plugged due to the identification of single volumetric indications. Please discuss the cause and the size (length, depth) of these indications. Address the implications of these findings including the technical basis for your conclusions regarding the cause of the indications (e.g., tube pull results, etc.).
3.
The March 12, 2003, letter (page 7) indicates that 5 tubes were repaired because of tube support plate wear at various locations. Provide more details about the location of the degradation and the size of the degradation including your basis for concluding that the indications were attributed to wear.
4.
A tube in SG A (Row 25, Column 71) was plugged due to multiple circumferential indications near a Westinghouse laser welded sleeve. Page 5 of Attachment 1 to the March 17, 2003, letter states, in part, that there was no degradation detected in the sleeves. Clarify the location of the indication in tube R25C71 with respect to the sleeve including the possible relationship between the indication and the sleeve. Discuss whether this indication was service-induced degradation and the basis for this conclusion. If not service-induced, discuss the cause of the indication. Also address the implications of these findings.
5.
The rotating probe inspection scope included examination of 20 PERCENT of the dents and dings within bobbin coil signals above 2 volts. Please explain how tubes with dent and ding signals greater than 2 volts were selected for rotating probe testing. For example, were all dents and dings greater than 5 volts selected? If not, why not?
Discuss whether any cracks were found associated with dents/dings. If any were selected, discuss the size of the indications and of the dent/ding.
6.
Clarify the statement on page 7 of Attachment 1 to the March 17, 2003 letter which indicates that "since through wall tearing and burst will not occur at 3 P, leakage integrity at an SLB differential pressure of 2560 psi is also demonstrated."
7.
Licensee Event Report 2002-011-00, submitted November 19, 2002, states that the classification of Steam Generator A inspection results as C-3 was reported in Event Notification#39345 on November 5, 2002. Since this latter report cannot be found in ADAMS, please provide a copy of Event Notification#39345.
Callaway Plant, Unit 1 cc:
Professional Nuclear Consulting, Inc.
19041 Raines Drive Derwood, MD 20855 John ONeill, Esq.
Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.
Washington, D.C. 20037 Mr. Mark A. Reidmeyer, Regional Regulatory Affairs Supervisor /
Regulatory Affairs AmerenUE P.O. Box 620 Fulton, MO 65251 U.S. Nuclear Regulatory Commission Resident Inspector Office 8201 NRC Road Steedman, MO 65077-1302 Manager, Quality Assurance AmerenUE P.O. Box 620 Fulton, MO 65251 Manager - Electric Department Missouri Public Service Commission 301 W. High P.O. Box 360 Jefferson City, MO 65102 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Mr. Ronald A. Kucera Deputy Director for Public Policy Department of Natural Resources P.O. Box 176 Jefferson City, Missouri 65102 Mr. Rick A. Muench President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KA 66839 Mr. Dan I. Bolef, President Kay Drey, Representative Board of Directors Coalition for the Environment 6267 Delmar Boulevard University City, MO 63130 Mr. Lee Fritz, Presiding Commissioner Callaway County Court House 10 East Fifth Street Fulton, MO 65151 Mr. David E. Shafer Superintendent, Licensing Regulatory Affairs AmerenUE P.O. Box 66149, MC 470 St. Louis, MO 63166-6149 Manager, Regulatory Affairs AmerenUE P.O. Box 620 Fulton, MO 65251 Mr. Scott Clardy, Director Section for Environmental Public Health P.O. Box 570 Jefferson City, MO 65102-0570