L-2005-077, Refueling Outage SL1-19 Steam Generator Tube Inservice Inspection Special Report
| ML051090258 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 04/08/2005 |
| From: | Jefferson W Florida Power & Light Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-2005-077 | |
| Download: ML051090258 (4) | |
Text
FPL Florida Power & Light Company, 6501 S. Ocean Drive, Jensen Beach, FL 34957 April 8, 2005 L-2005-077 10 CFR 50.55a 10 CFR 50.36 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re:
St. Lucie Unit 1 Docket No. 50-335 Refueling Outage SLI1-19 Steam Generator Tube Inservice Inspection Special Report Attached is the Steam Generator Tube Inservice Inspection Special Report required by sections 4.4.5.5.b and 6.9.2 of the St. Lucie Unit 1 Technical Specifications for the spring 2004 refueling outage (SLI-19). The report is to be submitted within one year of completing the refueling outage steam generator in service inspection.
Should there be any questions, please contact us.
William JMffersi Vice President St. Lucie Plant WJ/GRM Attachment I
an FPL Group company
St. Lucie Unit 1 Docket No. 50-335 L-2005-077 Attachment Page 1 St. Lucie Unit I Spring 2004 Refueling Outage SLI-19 Steam Generator Tube Inservice Inspection Special Report
St. Lucie Unit 1 Docket No. 50-335 L-2005-077 Attachment Page 2 This report addresses Plant Technical Specification Section 4.4.5.5 b.
The attached information provides the summarized results for the in-service examination of steam generator tubing, which is to be submitted to the Commission within twelve months of the examination completion date.
- 1.
In-service eddy current examination and tube plugging of the St. Lucie Unit 1 steam generators was completed between April 4, 2004 and April 10, 2004.
The examination scope as noted below is represented under "Total Tubes Inspected" on the attached FORM NIS-BB, Owners' Data Report for Eddy Current Examination Results.
Examination Scope Bobbin Coil Probe Approximately 57% of the in-service tubes in S/G 1A and approximately 54% of the in-service tubes in S/G 1 B were examined from tube end to tube end.
Row 3 examinations (because of the tight bend radii) included the hot leg and cold leg straight sections with complementary u-bend examinations performed using the Plus Point Probe.
Plus Point Rotating Probe Approximately 50% of the hot leg Expansion Transitions from 3" above to 2" below the secondary face of the tubesheet.
50% of the row 3 U-bends as a minimum were examined. (Row 3 has the tightest bend radius due to the crossover design)
Special interest (diagnostic) locations as required by the bobbin coil results.
- 2.
The location and percent of wall thickness penetration is also summarized on the attached "FORM NIS-BB" under "Location of Indications. To date, no corrosion type indications have been reported at St. Lucie Unit 1.
- 3.
Three (3) tubes were preventively plugged in SIG 1A due to mechanical wear that was less than the Technical Specification plugging limit of 40% wall thickness penetration.
This is summarized in the upper portion of the attached "FORM NIS-BB".
- 4.
A total of 21 mechanical wear indications (17 in SG A and 4 in SG B) detected at u-bend support structures that measured less than 20% wall thickness penetration will remain in service for cycle 19.
- 5.
The source documents (Tubes preventively plugged, 20% to 39%, and 1% to 19%)
used for preparation of "Form NIS-BB" are attached for reference.
St. Lucie Unit 1 Docket No. 50-335 L-2005-077 Attachment Page 3 FORM NIS-BB OWNERS' DATA REPORT FOR EDDY CURRENT EXAMINATION RESULTS As required by the provisions of the ASME CODE RULES EDDY CURRENT EXAMINATION RESULTS PLANT: St. Lucie Unit 1 Outage: SL1 -19 EXAMINATION DATE: April 4,2004 through April 10, 2004 TOTAL TUBES TOTAL STEAM TOTAL TOTAL TOTAL TUBES PLUGGED PLUGGED GENERATOR TUBES TUBES TUBES PREVENTIVELY THIS TUBES l
INSPECTED 20_/-39%
PLUGGED (PTP)
OUTAGE IN SIG 769802A (Bobbin) 4834 3
0 3
3 14 769801B (Bobbin) 4640 0
0 0
0 769802A (RPC)
)
4288 0
0 0
0 See Bobbin 769801B (RPC) (1) 4291 e2) 0 0
0 0
See Bobbin LOCATION OF INDICATIONS (1% - 100%, PIT & VOL)
U Bend Lattice Grids STEAM CBH p (TSP's)
Top of Topof Total GENERATOR To 01 to 07 Tubesheet Tubesheet Indications CBC (3)to to
- 1 Support
- 1 Support WL C/L C/L H1L 1%-19%
20%39% 2 40%, PITor VOL 769802A (Bobbin) 3 0
0 17 3 (4) 0 769801B (Bobbin) 0 0
0 0
0 4
0 0
769802A (RPC) 0 0
n/a ra n/a W/a n/a 0
769801B (RPC) v1 0
n/a
./a n/a n/a nWa n/a 0
Remarks:
(1) RPC = Rotating Pancake Coil Technique.
(2) Includes tubes in the low row U-bend & dent programs.
(3) CBH = Connector Bar Hot Leg: CBC =Connector Bar Cold Leg (4) Tubes with indications measuring greater than or equal to 20% through wall were preventively plugged (PTP).