On April 08, 2004, during the Unit 1 twelfth refueling outage (1R12), analysis of eddy current data on [Steam Generator]
SG 1-4 indicated that greater than one percent of the total tubes inspected in
SG 1-4 were defective. Approximately ninety (90) defective tubes in
SG 1-4 were detected and are being plugged. Most of the pluggable indications are due to circumferential primary water stress corrosion cracking in the Rows 5 to 8 U-bend region. Results of the
SG tube inspection fall into Category C-3, which requires a four-hour non-emergency report in accordance with Technical Specification (TS) Table 5.5.9-2 and
10 CFR 50.72(b)(3)(ii) (an 8-hour requirement replacing the former (b)(2)(iii)(C), 4-hour requirement).
An NRC teleconference in accordance with TS 5.6.10.d to report the results of the voltage-based repair criteria implemented for the tube support plate intersections is currently scheduled for Wednesday April 14, 2004, at 1300 EDT.
A Special Report in accordance with TS 5.6.10.a and e will be submitted prior to returning Unit 1 to power operation.
A Licensee Event Report in accordance with 10 CFR 50.73(a)(2)(v)(C) will be submitted within 60 days.
The Licensee notified the NRC Resident Inspector.
