L-08-253, Steam Generator Tube Inspection Report - Technical Specification 5.6.6.2.4
| ML082240290 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 08/07/2008 |
| From: | Sena P FirstEnergy Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-08-253 | |
| Download: ML082240290 (6) | |
Text
FENOC FirstEnergy Nuclear Operating Company Peter P. Sena III 724-682-5234 Site Vice President Fax: 724-643-8069 August 7, 2008 L-08-253 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 Steam Generator Tube Inspection Report - Technical Specification 5.6.6.2.4 Pursuant to Technical Specification 5.6.6.2.4, FirstEnergy Nuclear Operating Company (FENOC) hereby provides a report containing tube inspection results for Beaver Valley Power Station, Unit No. 2 steam generators. The attachment to this letter provides information required by the technical specification that was obtained during inspections conducted during the spring 2008 refueling outage (2R13).
There are no regulatory commitments contained in this letter. If there are any questions or if additional information is required, please contact Mr. Thomas A. Lentz, Manager -
FENOC Fleet Licensing, at 330-761-6071.
Sincerely, Peter P. Sena Ill
Attachment:
Steam Generator Tube Inspection Report - Technical Specification 5.6.6.2.4 cc:
Mr. S. J. Collins, NRC Region I Administrator Mr. D. L. Werkheiser, NRC Senior Resident Inspector Ms. N. S. Morgan, NRR Project Manager Mr. D. J. Allard, Director BRP/DEP Mr. L. E. Ryan (BRP/DEP)
Attachment L-08-253 Page 1 of 5 Beaver Valley Power Station Unit No. 2 Steam Generator Tube Inspection Report Technical Specification 5.6.6.2.4 This report is provided pursuant to Technical Specification 5.6.6.2.4 with respect to steam generator tube inspections conducted during the spring 2008 refueling outage (2R1 3).
During the 2R1 3 outage, the Plus Point probe was used to inspect the hot leg top of the tubesheet region. The inspection scope was 100 percent of the active hot leg tubes in all steam generators (SGs). The inspection distance was from 6.0 inches above the top of tubesheet to 3.0 inches below the top of tubesheet, including examination of the F* distance below the bottom of the roll expansion transition. Ten (10) tubes with roll expansion transitions at lower than nominal elevations were inspected to a depth of 5.0 inches below the top of tubesheet to ensure that the F* distance was adequately examined.
Tables A through C provide tabulations of inspection results found in the tubesheet region.
Consistent with the reporting requirements of TS 5.6.6.2.4, each of the tables provides the following information for the respective SG:
- a. Total number of indications, location of each indication, orientation of each indication, severity of each indication, and whether the indications initiated from the inside or outside surface
- b. The cumulative number of indications detected in the tubesheet region as a function of elevation within the tubesheet
- c. The projected end-of-cycle accident-induced leakage from tubesheet indications All indications observed were plugged upon detection. All circumferential indications were stabilized prior to installing the hot leg plug. None of the indications that were removed from service during 2R13 represented a leakage potential at postulated main steam line break conditions during Cycle 13. The following is a summary of the degradation observed during the tubesheet region Plus Point examinations.
Table D provides inspection results for indications found in non-tubesheet regions of the SGs.
SG "A" Hot Leg:
Thirty-seven tubes were plugged for indications reported during the hot leg tubesheet region examination. Of the thirty seven tubes, one tube (R32 C28) was reported with a single axial outside diameter stress corrosion cracking (ODSCC) indication located 0.04 inches below the top of tubesheet and one tube (R34 C47) was reported with a single circumferential ODSCC indication located 0.01 inches above the top of tubesheet. The remaining 35 tubes were reported with either single or multiple circumferential ODSCC indications located at or slightly below the top of tubesheet. Table A provides a tabulation of these results.
Attachment L-08-253 Page 2 of 5 Table A 2RCS-SG21A 2R13 Tubesheet Indications Indication Location Severity Initiation Projected SG Row Column Elevation*
Orientation Volts***Axial Arc Surface Leakage Length Length A
2 57 TSH -0.07" SCI 0.17 420 ODSCC 0
A 2
70 TSH -0.13" SCl 0.14 740 ODSCC 0
A 7
55 TSH -0.05" SCI 0.09 340 ODSCC 0
A 7
65 TSH -0.07" SCI 0.10 380 ODSCC 0
A 7
81 TSH -0.11" SCI 0.18 660 ODSCC 0
A 8
30 TSH -0.09" SCI 0.22 1100 ODSCC 0
A 11 82 TSH -0.12" SCI 0.16 480 ODSCC 0
A 19 23 TSH -0.11" SCI 0.12 990 ODSCC 0
A 19 50 TSH -0.11" 301 0.14 3Q0 ODSCC 0
A 20 38 TSH -0.16" SCI 0.12 270 ODSCC 0
A 20 41 TSH -0.10" SCI 0.17 1820 ODSCC 0
A 21 17 TSH -0.10" SCI 0.18 1170 ODSCC 0
A 22 38 TSH -0.13" SCI 0.12 370 ODSCC 0
A 24 21 TSH -0.11" SCI 0.23 1100 ODSCC 0
A 25 23 TSH -0.17" SCI 0.11 1250 ODSCC 0
A 27 21 TSH -0.02" SCI 0.26 800 ODSCC 0
A 27 39 TSH -0.11" SC0 0.12 350 ODSCC 0
A 27 67 TSH -0.05" SCI 0.16 820 ODSCC 0
A 27 68 TSH -0.07" SCI 0.10 2060 ODSCC 0
A 28 25 TSH -0.14" SCI 0.08 1140 ODSCC 0
A 28 29 TSH -0.14" SCI 0.16 1140 ODSCC 0
A 28 71 TSH -0.06" SCI 0.08 610 ODSCC 0
A 29 23 TSH -0.16" SCl 0.23 1100 0DSCC 0
A 30 23 TSH -0.17" SCl 0.14 1290 ODSCC 0
A 30 71 TSH -0.04" SCI 0.25 1040 ODSCC 0
A 30 72 TSH -0.01" MCI 0.50 1220 ODSCC 0
A 30 73 TSH -0.14" SCI 0.07 260 ODSCC 0
A 32 28 TSH -0.04" SAI 0.33 0.23" ODSCC 0
A 33 35 TSH -0.07" 301 0.13 330 003CC 0
A 34 47 TSH +0.01" SC0 0.10 270 ODSCC 0
A 35 67 TSH -0.06" SCI 0.49 1370 ODSCC 0
A 36 33 TSH -0.08" SC0 0.21 710 ODSCC 0
A 37 62 TSH 0.00" MCI 0.22 340 ODSCC 0
A 38 33 TSH -0.09" SCI 0.11 380 ODSCC 0
A 40 52 TSH -0.10" SCI 0.33 400 ODSCC 0
A 41 39 TSH -0.09" SCI 0.12 620 ODSCC 0
A 41 44 TSH -0.04" MCI 0.11 300 ODSCC 0
6H - I uDesneet-fot (secondary side ot tubesheet)
- 301-single circumferential indication SAI - single axial indication MCI - multiple circumferential indications Volts reported using the 300 kHz Plus Point coil
Attachment L-08-253 Page 3 of 5 SG "B" Hot Leg:
Twenty-seven tubes were plugged for indications reported during the hot leg tubesheet region examination. Of the twenty seven tubes; one tube (R20 C25) was reported with a single axial ODSCC indication located 0.17 inches above the top of tubesheet, one tube (R6 C36) was reported with an single axial primary water stress corrosion cracking (PWSCC) indication located 0.05 inches below the top of tubesheet and one tube (R8 C51) was reported with a single circumferential ODSCC indication located 0.01 inches above the top of tubesheet. The remaining 24 tubes were reported with either single or multiple circumferential ODSCC indications located at or slightly below the top of tubesheet. Table B provides a tabulation of these results.
Table B 2RCS-SG21 B 2R13 Tubesheet Indications Indication Location Severity n*
A A
Initiation Projected SG Rw Clm lvto*Orientation**
Axial Arc Surface Leakage SG Row Column Elevation*
Volts***Sufc Lekg Length Length B
3 17 TSH -0.03" SCI 0.14 450 ODSCC 0
B 6
36 TSH -0.05" SAI 0.29 0.15" PWSCC 0
B 8
38 TSH -0.10" SCI 0.10 890 ODSCC 0
B 8
51 TSH +0.01" SCI 0.12 400 ODSCC 0
B 9
45 TSH -0.08" SCI 0.15 450 ODSCC 0
B 9
47 TSH -0.05" SCI 0.09 340 ODSCC 0
B 10 47 TSH 0.00" MCI 0.19 1730 ODSCC 0
B 15 14 TSH -0.05" SCI 0.11 830 ODSCC 0
B 16 17 TSH -0.09" SCI 0.27 600 ODSCC 0
B 16 22 TSH -0.05" SCI 0.10 190 ODSCC 0
B 16 23 TSH -0.04" SCI 0.11 260 ODSCC 0
B 19 32 TSH -0.05" SCl 0.12 640 ODSCC 0
B 19 44 TSH -0.09" SCI 0.07 930 ODSCC 0
B 19 47 TSH -0.05" MCI 0.18 1730 ODSCC 0
B 20 25 TSH +0.17" SAI 0.15 0.18" ODSCC 0
B 20 60 TSH -0.06" SCI 0.17 1710 ODSCC 0
B 20 75 TSH -0.10" SCI 0.07 680 ODSCC 0
B 22 41 TSH -0.08" SCI 0.09 750 ODSCC 0
B 28 45 TSH -0.08" MCI 0.15 1460 ODSCC 0
B 28 58 TSH -0.08" MCI 0.11 1800 ODSCC 0
B 30 39 TSH -0.10" SCI 0.09 260 ODSCC 0
B 32 44 TSH -0.07" SCI 0.12 450 ODSCC 0
B 33 38 TSH -0.10" SCI 0.09 640 ODSCC 0
B 33 39 TSH -0.05" SCI 0.15 380 ODSCC 0
B 33 47 TSH -0.08" SCI 0.18 450 ODSCC 0
B 33 58 TSH -0.04" SCI 0.11 710 ODSCC 0
B 37 37 TSH -0.06" SCI 0.19 560 ODSCC 0
- TSH - Tubesheet-hot (secondary side of tubesheet)
- SCI - single circumferential indication SAI - single axial indication MCI - multiple circumferential indications
- Volts reported using the 300 kHz Plus Point coil
Attachment L-08-253 Page 4 of 5 SG "C" Hot Leg:
Sixteen tubes were plugged for indications reported during the hot leg tubesheet region examination. Of the sixteen tubes; one tube (R5 C38) was reported with a single axial ODSCC indication located 0.11 inches above the top of tubesheet. The remaining 15 tubes were reported with either single or multiple circumferential ODSCC indications located below the top of tubesheet. Table C is a tabulation of these results.
Table C 2RCS-SG21 C 2R13 Tubesheet Indications Indication Location Severity I i a o Pr e t Orietatin**Initiation Projected SG Row Column Elevation*
Volts***
Axial Arc Surface Leakage Length Length C
2 82 TSH -0.11" SCI 0.29 880 ODSCC 0
C 5
38 TSH +0.11" SAI 0.08 0.08" ODSCC 0
C 6
31 TSH -0.05" SCl 0.09 890 ODSCC 0
C 7
34 TSH -0.05" SCI 0.10 760 ODSCC 0
C 8
38 TSH -0.02" SCI 0.12 220 ODSCC 0
C 8
44 TSH -0.05" SCI 0.08 310 ODSCC 0
C 10 40 TSH -0.03" SCI 0.09 220 ODSCC 0
C 13 38 TSH -0.08" SCl 0.08 550 ODSCC 0
C 16 91 TSH -0.22" SCI 0.16 640 ODSCC 0
C 24 24 TSH -0.06" SCI 0.25 1110 ODSCC 0
C 27 36 TSH -0.09" SCl 0.10 220 ODSCC 0
C 33 62 TSH -0.05" MCI 0.10 189****
ODSCC 0
C 35 60 TSH -0.07" SCI 0.17 300 ODSCC 0
C 36 60 TSH -0.09" SCI 0.12 1400 ODSCC 0
C 36 65 TSH -0.08" SCI 0.06 340 ODSCC 0
C 37 61 TSH -0.08" SCI 0.26 182° ODSCC 0
TSH - Tubesheet-hot (secondary side of tubesheet)
- SCI - single circumferential indication SAI - single axial indication MCI - multiple circumferential indications Volts reported using the 300 kHz Plus Point coil
- Profile analysis shows two separate flaw segments separated by a non-degraded ligament of approximately 48 degrees in arc length
Attachment L-08-253 Page 5 of 5 Non-Tubesheet Reqion:
There were an additional four tubes plugged for non-tubesheet region related degradation.
Three tubes were reported with single axial indications located within the hot leg tube support plates and one tube was reported with a circumferential indication located within a hot leg "free-span" ding. Table D is a tabulation of these results.
Table D 2R13 Non-Tubesheet Region Indications Indication Location Severity I i a o Pr e t Orientation**
xil A
Initiation Projected SG Row Column Elevation*
Volts***
Axial Arc Surface Leakage Length Length C
11 15 03H -0.14" SAI 0.18 0.46" ODSCC 0
C 20 12 04H -0.09" SAI 0.13 0.15" ODSCC 0
C 23 58 06H +30.87" SCI 0.96 300 ODSCC 0
C 32 68 03H 0.00" SAI 0.14 0.36" ODSCC 0
- 03H, 04H, 06H = 3rd, 4th or 6th Hot Leg tube support plate
- SAI - single axial indication SCI - single circumferential indication
- Volts reported using the 300 kHz Plus Point coil