NRC 2005-0030, Supplement to Spring 2004 Unit 1 (Ul R28) Steam Generator Examination Report

Supplement to Spring 2004 Unit 1 (Ul R28) Steam Generator Examination Report

ML050830168
Person / Time
Site:	Point Beach
Issue date:	03/04/2005
From:	Koehl D Nuclear Management Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NRC 2005-0030
Download: ML050830168 (7)

Text

NMCh Committed to Nuclear Excellence Point Beach Nuclear Plant Operated by Nuclear Management Company, LLC March 4, 2005 NRC 2005-0030 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Unit 1 Docket 50-266 License No. DPR-24 Supplement to Spring 2004 Unit 1 (Ul R28) Steam Generator Examination Report

Reference:

Letter from NMC to NRC dated June 10, 2004 (NRC 2004-0060)

The referenced letter submitted a summary of the spring 2004 Unit 1 steam generator (SG) eddy current examinations in accordance with the requirements of Point Beach Nuclear Plant (PBNP) Technical Specifications 5.6.8(a) and 5.6.8(b). During a conference call between NMC representatives and NRC staff on February 15, 2005, the staff stated that more specific SG tube location information was required to identify the locations for each indication discussed in the report.

The enclosure provides the specific location and percentage of tube wall thickness lost for each indication of degradation identified in the Unit 1 SG tubes.

This letter contains no new commitments and no revisions to existing commitments.

Dennis L. Koehl Site Vice-President, Point Beach Nuclear Plant Nuclear Management Company, LLC Enclosure cc: Administrator, Region l1l, USNRC Project Manager, Point Beach Nuclear Plant, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC PSCW 6590 Nuclear Road

• Two Rivers, Wisconsin 54241 Telephone: 920.755.2321 _g- fl

ENCLOSURE SUPPLEMENT TO SPRING 2004 UNIT 1 (U1R28) STEAM GENERATOR EXAMINATION REPORT The following information is provided to supplement the June 10, 2004, report of the Unit 1 steam generator (SG) spring 2004 examination. The tables below identify the specific location and percentage of tube wall thickness lost for each indication of degradation identified in the Unit 1 SG tubes. A typical SG cut-away drawing and a tube sheet map for each Unit I SG are also included to help clarify indication locations.

Anti-Vibration Bar Wear in Steam Generator A Row Column Location Percentage Lost 32 14 Anti-Vibration Bar 3 5 33 18 Anti-Vibration Bar 3 25 33 18 Anti-Vibration Bar 4 16 35 18 Anti-Vibration Bar 2 10 38 22 Anti-Vibration Bar 3 12 40 25 Anti-Vibration Bar 2 6 40 27 Anti-Vibration Bar 3 5 34 33 Anti-Vibration Bar 1 10 34 33 Anti-Vibration Bar 2 7 33 37 Anti-Vibration Bar 4 9 45 41 Anti-Vibration Bar 1 6 45 41 Anti-Vibration Bar 4 7 40 42 Anti-Vibration Bar 1 12 38 43 Anti-Vibration Bar 1 23 38 43 Anti-Vibration Bar 2 23 45 43 Anti-Vibration Bar 1 13 45 43 Anti-Vibration Bar 4 8 40 X _44 Anti-Vibration Bar 3 13 40 47 Anti-Vibration Bar 3 10 33 48 Anti-Vibration Bar 3 13 45 49 Anti-Vibration Bar 1 19 19 _ _54 Anti-Vibration Bar 2 12 19 54 Anti-Vibration Bar 4 12 38 54 Anti-Vibration Bar 3 25 35 56 Anti-Vibration Bar 1 14 35 56 Anti-Vibration Bar 2 27 19 61 Anti-Vibration Bar 1 12 19 61 Anti-Vibration Bar 2 15 19 61 Anti-Vibration Bar 4 6 31 63 Anti-Vibration Bar 2 20 31 63 Anti-Vibration Bar 3 10 34 65 Anti-Vibration Bar 3 9 34 65 Anti-Vibration Bar 4 15 Page 1 of 3

Anti-Vibration Bar Wear in Steam Generator A Row Column Location Percentage Lost 33 66 Anti-Vibration Bar 1 20 33 66 Anti-Vibration Bar 2 13 33 66 Anti-Vibration Bar 3 5 39 68 Anti-Vibration Bar 4 9 34 69 Anti-Vibration Bar 1 3 34 69 Anti-Vibration Bar 2 11 27 71 Anti-Vibration Bar 2 6 27 71 Anti-Vibration Bar 3 10 27 71 Anti-Vibration Bar 4 5 32 71 Anti-Vibration Bar 2 11 33 71 Anti-Vibration Bar 2 13 33 71 Anti-Vibration Bar 3 6 Anti-Vibration Bar Wear In Steam Generator B Row Column Location Percentage Lost 32 32 Anti-Vibration Bar 3 13 23 33 Anti-Vibration Bar 1 11 23 33 Anti-Vibration Bar 2 15 23 33 Anti-Vibration Bar 3 25 19 36 Anti-Vibration Bar 3 9 32 44 Anti-Vibration Bar 3 8 45 44 Anti-Vibration Bar 1 14 32 46 Anti-Vibration Bar 2 15 32 46 Anti-Vibration Bar 3 18 45 46 Anti-Vibration Bar 1 13 32 49 Anti-Vibration Bar 1 18 32 49 Anti-Vibration Bar 2 15 44 54 Anti-Vibration Bar 1 8 22 58 Anti-Vibration Bar 1 9 22 58 Anti-Vibration Bar 2 21 22 58 Anti-Vibration Bar 3 19 22 58 Anti-Vibration Bar 4 14 32 70 Anti-Vibration Bar 1 11 32 70 Anti-Vibration Bar 2 17 33 71 Anti-Vibration Bar 1 19 33 71 Anti-Vibration Bar 2 10 Page 2of3

Mechanical Wear Above the Tot of Tube Sheet Hot Leg in Steam Generator A Row Column Percent Location Inches above tubesheet 37 20 4 Tubesheet Hot Leg +0.63 37 20 1 Tubesheet Hot Leg +0.74 42 30 5 Tubesheet Hot Leg +0.59 43 33 5 Tubesheet Hot Leg +0.64 44 36 6 Tubesheet Hot Leg +0.67 45 41 4 Tubesheet Hot Leg +0.73 45 42 3 Tubesheet Hot Leg +0.7 45 43 1 Tubesheet Hot Leg +0.65 45 44 4 Tubesheet Hot Leg +0.62 45 45 10 Tubesheet Hot Leg +0.65 45 46 7 Tubesheet Hot Leg +0.62 45 47 5 Tubesheet Hot Leg +0.66 43 60 7 Tubesheet Hot Leg +0.61 42 63 1 Tubesheet Hot Leg +1.42 42 63 1 Tubesheet Hot Leg +2.49 42 63 11 Tubesheet Hot Leg +0.61 31 80 3 Tubesheet Hot Leg +0.66 17 indications in 14 tubes I Mechanical Wear Above the Top of Tube Sheet Hot Leg in Steam Generator B I Row l Column l Percent l Location l Inches above tubesheet 1 92 9 Tubesheet Hot Le +6.16 1 indication in 1 tube Wear Indications At Cold Leg Supports in Steam Generator A Row Column Percent Location Inches above support 39 24 12 Support 3 Cold Leg +0.49 41 65 18 Support 2 Cold Leg +0.53 21 85 10 Support 2 Cold Leg +0.49 No wear indications at supports in SG B Possible Loose Part (PLP) Investigated In Steam Generator B - No wear Row Column Location Inches above tubesheet 42 49 Tubesheet Hot Leg +0.3 43 49 Tubesheet Hot Leg +0.27 43 51 Tubesheet Hot Leg +0.84 43 52 Tubesheet Hot Leg +0.32 44 52 Tubesheet Hot Leg +0.13 44 53 Tubesheet Hot Leg +0.12 A visual inspection of SG B did not identify any loose parts in this region. No loose parts had been indicated in SG A.

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Steam Outlet to Turbine Generator Secondary Moisture Separator Secondary Side Manway (2 Unit 2, 1 Unit 1)

-- Primary Moisture Upper Shell Separator Swirl Elevated Feedwater--_

D.--

1"11r Feedwater Inlet Anti-Vibration Bars Transition Cone Tube Bundle Lower Shell N Tube Support Plate (7 Unit 2, 6 Unit 1)

Secondary Side Flow Distribution Hand Hole Baffle Tube Sheet Support Foot Channel Head Divider Plate Primary Coolant Inlet Channel Head Primary Side Manway 0 Primary Side Manway