ML12165A350

Summary of Conference Call for Stream Generator Tube Inservice Inspections for Spring 2012 Refueling Outage

ML12165A350
Person / Time
Site:	Davis Besse
Issue date:	07/16/2012
From:	Michael Mahoney Plant Licensing Branch III
To:	Allen B S FirstEnergy Nuclear Operating Co
Michael Mahoney
References
TAC ME8477
Download: ML12165A350 (17)

Text

UNITED NUCLEAR REGULATORY WASHINGTON, D.C.

July 16, 2012 Mr. Barry S. Allen Site Vice President FirstEnergy Nuclear Operating Company Davis-Besse Nuclear Power Station Mail Stop A-DB-3080 5501 North State Route 2 Oak Harbor, OH 43449-9760 DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO.1

SUMMARY

OF CONFERENCE CALL FOR STEAM GENERATOR TUBE INSERVICE INSPECTIONS FOR SPRING 2012 REFUELING OUTAGE (TAC NO. ME8477)

Dear Mr. Allen:

On May 23,2012, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with FirstEnergy Nuclear Operating Company (FENOC), regarding the spring 2012 steam generator (SG) tube inservice inspections for refueling outage 17 (17RFO) at Davis-Besse Nuclear Power Station, Unit NO.1. A summary of the notes by the NRC staff of the May 23, 2012 conference call, is enclosed.

In addition, a handout provided by FENOC to support the conference call with inspection results and a License Condition 2.C(7) SG tube circumferential crack report are also enclosed.

The NRC staff did not identify any issues that would require follow-up action at that time; however, the NRC staff asked to be notified in the event any unusual conditions were detected during the remainder of the outage. Should you have any questions you can contact me at 301-415-3867.

s..i..

0/1/1 .. '///I / ///J Ifh;ael Mahoney, Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-346

Enclosures:

Summary of May 23, 2012 Conference Call Davis-Besse 17RFO SG Tube Inspection Tables Davis-Besse 17RFO License Condition 2.C(7) SG tube circumferential crack report MAY 23, 2012 CONFERENCE CALL

SUMMARY

DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO.1 SPRING 2012 STEAM GENERATOR INSPECTION RESULTS On May 23, 2012, the U.S. Nuclear Regulatory Commission (NRC) staff of the Steam Generator Tube Integrity and Chemical Engineering Branch of the Division of Engineering in the Office of Nuclear Reactor Regulation participated in a conference call with representatives of FirstEnergy Nuclear Operating Company (FENOC, the licensee) regarding the ongoing steam generator (SG) inspection activities at Davis-Besse Nuclear Power Station, Unit No.1 (DBNPS). DBNPS has two Babcock and Wilcox once-through steam generators (OTSG), designated 1-B and 2-A. Each SG has approximately 15,500 Alloy 600 tubes in the mill-annealed condition (heat treatment applied to materials to improve their corrosion and mechanical properties).

The tubes have a nominal outside diameter of 0.625 inches and a nominal wall-thickness of 0.037 inches. Both OTSG 1-B and 2-A contain tubes with sleeves. To support the conference call, the licensee provided two documents.

Tables identified as Davis-Besse 17RFO Eddy Current Exam Scope is Enclosure 2 and License Condition 2.C(7) SG tube circumferential crack report is Enclosure

3. Additional clarifying information or information not included in the documents provided by the licensee is summarized below. In the recently completed operating cycle (Cycle 17), DBNPS operated for 599 effective full power days. The primary-to-secondary leakage rate during Cycle 17 was steady at approximately

0.1 gallons

per day. Due to the low leak rate, a secondary side pressure test was not performed which is consistent with SG Integrity Assessment Guidelines.

The Electric Power Research Institute's "Steam Generator Program: Pressurized Water Reactor Steam Generator Examination Guidelines" was followed.

In the Table, "Davis-Besse 17RFO Eddy Current Exam Scope" provided by the licensee:

NSRT means non-stress relieved roll transition The +PointŽ inspection of in-service stress relieved lower tube roll expansions and tube ends in SG 1-B included 100 percent of shop re-rolls in SG 1-B. The scope of examinations documented by the row labeled +PointŽ coil examination of all non-quantifiable signal and manufacturer burnishing mark indications above 1 OS-2 inches," was expanded to the 9 th tube support plate +1 inch (9S+1 "). The scope Enclosure 1

expansion was based on groove intergranular attack (IGA) found at a non-quantifiable indication.

Fifteen indications of IGA were detected in 14 tubes in SG 2-A and indications of IGA were detected in 18 tubes in SG The licensee clarified that there was no degradation found in any of the dents during dent The scope of the +PointŽ coil examination of the lower tubesheet sludge pile region from 3 inches above the top of the tubesheet (TTS) to 3 inches below the TTS. If sludge level was greater than 3 inches above the TTS, the inspection extent expanded to include the extra height of the sludge. No indications were found this No cracks were noted in the lower tubesheet in SG To date, no indications were detected in the lower tubesheet crevice with a +PointŽ that had not been detected with a bobbin probe. In the table titled "2.C(7) Steam Generator Tube Circumferential Crack Report": After the May 23, 2012 call, the licensee provided an updated version of this table, corrected tubes that were misidentified in the first version of the The best estimate leakage was 0.1133 gallon per minute None of the cracking indications were inboard of a repair The tube in row 142 column 26 (R 142C26) contained a single volumetric indication the licensee judged was created by the manipulator anchor pin of an inspection robot. The indication was located in a region where IGA is not normally detected.

No circumferential cracks were found in-board of the roil/re-roll The "section b" column of the table identifies that the indication is in the roll transition the tubesheet weld heat affected The "section c" column of the table provides the best estimate leakage for those indications which may leak. In the table titled "New Tube End Indications (Not in Previously Rerolled Tubes)": There are 154 indications in SG 2-A and 88 indications in SG 'I-B. The licensee is planning to plug all of these indications.

In the table titled "Top 10 Wear Calls by Bobbin Depth": To date, the licensee has never had to plug any tubes as a result of a wear indication at a tube support plate elevation.

At the time of the call, the licensee was projecting that they would plug approximately 201 tubes in SG 2-A and 162 tubes in SG 1-B. The licensee was not planning to repair any tubes by rolling. No in-situ pressure testing was scheduled, but the licensee stated that they would notify the staff if their plans changed. No tube pulls were planned. The bobbin probe was used to identify possible loose part indications.

No secondary side potential loose parts were identified and no tube was attributed to a loose part. One loose part on the upper tubesheet of SG 2-A had been found at the time of the call. No cladding damage was associated with this loose part. The part was part of an old-style fuel assembly grid strap. The part was removed from the SG. No secondary side loose parts were det The auxiliary feedwater header gap analysis was completed in both SGs and all gaps showed greater than y.. inch via eddy current inspection.

There appeared to be no appreciable change in the eddy current signals since the previous inspection.

Based on these results, and an approved license amendment, the licensee did not perform a visual inspection of the internal abandoned-in-place auxiliary feedwater header in SG 2-A during this outage. The licensee stated that no secondary-side inspections were performed or planned during the current outage. The licensee noted that to date, there were no unexpected or unusual results noted during the inspections.

The licensee stated that results from the current outage were consistent with the previous operational assessment.

The inspection results indicate that tube integrity was maintained during Cycle 17. The licensee completed eddy current testing in the SGs on May 25,2012, and tube plugging on May 27, 2012. Per License Condition 2.C.7 -the licensee notified the NRC staff of the results of their assessment.

They found no circumferential cracking inboard of the repair rolls. Circumferential cracking in two original rolls was found (as shown in the circumferential cracking table) with an estimated leakage of 0.1133 gpm. The 2012 inspections were the last scheduled inspection for these SGs, as they are scheduled to be replaced during the next refueling outage. The NRC staff did not identify any issues that required follow-up action at this time; however, the NRC staff asked to be notified in the event that any unusual conditions were detected during the remainder of the outage. The tables identified as Davis-Besse 17RFO Eddy Current Exam Scope is Enclosure 2 and License Condition 2.C(7) SG tube circumferential crack report is Enclosure

3.

Davis Besse 17RFO Eddy Current Exam Scope SG2-A SG I-B Inspection of all newly installed repair rolls. Periphery AFW Header to tube gap analysis to determine if the header is moving. 0 336 0 378 Full length bobbin examination of all in-service non-sleeved tubing. 14552 14868 Full length bobbin examination of 100% of sleeves and of tubing below sleeves. 199 212 +PointŽ exam of the sleeve at the point of entry (USE) and parent tube pressure boundary portion extending approximately 6 inches past the sleeve end (LSE) of 100% of the sleeves (the parent tube between the bottom of the upper most sleeve roll and the top of the middle sleeve roll may be excluded from inspection since it is not a pressure boundary).

199 212 +PointŽ inspection of non-sleeved in-service upper tube roll expansions (100%) including non stress relieved upper repair roll expansions and factory re-rolls.

14552 14868 +PointŽ coil examination of 20% of the non-sleeved in-service tubes in the upper tube sheet region from tube end including tube end, upper roll expansion and crevice to upper tube sheet exit. 2911 2974 +PointŽ inspection of20% of the in-service stress relieved lower tube roll expansions and tube ends in OTSG 2-A. (including tube 127-67 with NSRT) 2951 0 +PointŽ inspection of in-service stress relieved lower tube roll expansions and tube ends in S/G I-B 100%. 0 15080 +PointŽ coil examination of the tubes bordering the sleeve region. 86 85 +PointŽ coil examination of all ofthe flaw-like indications (I codes, TWD per 4. 1.3.G and 4.2.3.G and new DNT) reported from bobbin. 550 estimate 530 estimate +PointŽ coil examination of all NQS and MBM indications above lOS -2". 220 estimate 240 estimate +PointŽ coil examination of all dent indications below 14S (l00% sample of all previously reported and new dents using a 2:2.5 volt bobbin threshold).

350 estimate 300 estimate +PointŽ coil examination of all dent indications greater than or equal to 1 volt above 14S in the non-periphery region. 330 estimate 430 estimate +PointŽ coil examination of all dent indications greater than or equal to 0.5 volts above 14S in the periphery region. 29 estimate 19 estimate +PointŽ coil sample inspection oflower tubesheet sludge pile region tubes. 1445 1687 Sleeve Bobbin and +PointŽ coil inspection of all previously identified geometric di SG I-B). 0 40 +PointŽ coil inspection of all previously identified and new magnetic stain (MAG) indications (22 tubes SG I-B) 0 22 Visual Plug exams of all Plugs in Upper and Lower (100%) 1412 754 Total Examinations 40122 52699 Page 1 of 11 Results as of: 6:57 AM,5/23/2012 Enclosure 2

Davis-Besse 17 RFO May Axial Row Tube TSP Inch1 Probe Depth Ax Len Deg Mode 22 92 520PP 84 0.19 ReRoll Transition PWSCC 29 89 520PP 72 0.22 ReRoll Transition PWSCC 81 520PP 80 0.17 ReRoll Transition PWSCC 79 520PP 58 0.19 ReRoll Transilion PWSCC -4.73 520PP 56 0.20 Groove IGA 2-A -3.39 520PP 74 0.25 ReRoll Transition PWSCC 2-A -3.24 520PP 82 0.21 ReRoll Transition PWSCC 2-A -3.12 520PP 89 0.19 ReRon Transilion PWSCC -3.03 520PP 56 0.18 ReRon Transilion PWSCC -3.13 0.22 ReRoll Transition PWSCC 0.15 ReRoll Transition PWSCC -3.41 0.27 -3.13 0.17 -2.98 0.19 2-A UTE ReRoll Transition PWSCC 2-A 16 UTE ReRoll Transition PWSCC 2-A 17 UTE ReRoll Transition PWSCC 2-A 18 UTE ReRoll Transition PWSCC 2-A 19 UTE 2-A 20 UTE 2-A UTE -3.07 UTE -3.06 UTE -3.54 15S 3.44 15S 1.48 UTE -3.35 UTE -3.56 -3.13 92 UTE -4.87 0.14 92 7 UTE -3.09 0.22 108 UTE -3.41 0.16 1-B 113 UTE -3.10 0.26 1*B 109 UTE 0.16 1-B UTE 0.17 1-B 35 14S 0.58 Groove IGA 1-B 36 10S 1.59 Groove IGA 1-B 37 12S 0.30 Groove IGA 1-B 38 UTE 0.14 Roll Transilion PWSCC 1-B 39 SAl 15S 0.60 Groove IGA 1-B 40 MAl UTE 0.18 Roll Transilion PWSCC 1-B 41 SAl UTE 0.12 ReRoll Transition PWSCC 1-B 42 SAl UTE 0.18 Roll Transition PWSCC 1-B 43 SAl UTE 0.14 Roll Transilion PWSCC 1-B 44 MAl UTE 0.17 ReRoli Transition PWSCC 1-B 45 MAl UTE 0.24 ReRoll Transition PWSCC 1-B 46 MAl UTE 0.22 ReRoll Transilion PWSCC 1-B 47 SAl UTE 0.18 Roll Transition PWSCC 1-B SAl UTE 520PP 0.18 Roll Transition PWSCC MAl UTE 520PP 0.27 ReRon Transition PWSCC MAl UTE 520PP 0.23 Roll Transition PWSCC SAl LTE 520PP 65 0.13 Transition PWSCC SAl 520PP 31 0.87 Groove IGA SAl 520PP 31 1.93 Groove IGA SAl 520PP 46 0.28 Groove IGA 1-B SAl 520PP 25 0.76 Groove IGA 1-B 77 SAl 520PP 63 0.17 Groove IGA 1-B 116 SAl 0.16 7.68 520PP 2 0.63 Groove IGA 1-B 116 SAl 0.12 8.67 520PP 0.48 Groove IGA 1-B 116 SAl 0.09 10.91 520PP 0.60 Groove IGA 1-B 116 SAl 0.08 11.63 520PP 0.31 Groove IGA 1-B SAl 0.13 -17.27 520PP Groove IGA 1-B SAl 0.11 -18.45 520PP 0.22 Groove IGA 1-B SAl 0.11 -15.60 520PP 0.43 Groove IGA 1-B MAl 1.99 UTE -3.20 520PP 0.37 ReRoll Transilion PWSCC Page 2 of 11 Results as of: 6:57 AM,5/23/2012 Davis-Besse 17 RFO May 2012 Axial Indications Row Tube =i3 HiH= 53 94 1 38 18 1-8 67 H 102 SAl 1-8 I 68 3 56 MAl 55 SAl 66 50 MAl 124 65 SAl 1-8 72 29 97 SAl 1-8 73 86 56 SAl 1-8 74 86 58 MAl 1-8 75 27 100 SAl 1-8 76 8 42 SAl 1-8 77 29 83 SAl 1-8 78 100 50 SAl 1-8 79 87 68 SAl Volts TSP Inch1 Probe 1.57 UTE -3.33 520PP UTE -2.95 520PP 0.59 UTE -1.88 520PP 1.23 UTE -1.56 520PP 0.90 UTE -0.99 520PP 1.01 UTE -1.46 520PP 0.11 14S 1.50 520PP 0.70 UTE -1.60 520PP 0.48 UTE -1.47 520PP 0.73 UTE -1.51 520PP 0.27 15S -1.33 520PP 1.25 UTE -3.02 520PP 0.41 UTE -3.20 520PP 0.53 UTE -1.21 520PP 1.25 UTE -1.77 520PP Depth Ax Len Deg Mode 56 0.22 ReRoll Transition PWSCC 90 0.24 ReRoll Transition PWSCC 89 0.17 Roll Transition PWSCC 62 0.18 Roll Transition PWSCC 69 0.20 Tube End PWSCC 69 0.15 Roll Transition PWSCC 85 0.29 Groove IGA 49 0.13 Roll Transition PWSCC 55 0.15 Roll Transition PWSCC 65 0.23 Roll Transition PWSCC 15 0.61 Groove IGA 100 0.17 ReRoll Transition PWSCC 47 0.12 ReRoll Transition PWSCC 58 0.12 Roll Transition PWSCC 65 0.20 Roll Transition PWSCC Page 3 of 11 Results as of: 6:57 AM,5/2312012 Davis-Besse 17RFO May 2.C(7) Steam Generator Tube Circumferential Crack SIG Count Row Tube Ind Volts TSP Inch Probe %TW Ci Ext Degradation Mechanism Section a Section b Section c 1-6 1 42 111 SCI 0.36 LTE 1.43 520PP 39 0.2 Roll Trans PWSCC x 1-6 1 45 77 SCI 0.46 LTE 1.52 520PP 56 0.16 Roll Trans PWSCC x 1-6 1 45 86 SCI 2.34 UTE -0.11 520PP 96 0.53 Tube End PWSCC x 1-6 1 48 78 MCI 0.87 LTE 1.52 520PP 35 0.62 Roll Trans PWSCC x 1-6 1 50 78 SCI 0.49 LTE 1.59 520PP 99 0.37 Roll Trans PWSCC x 1-6 1 51 79 MCI 0.27 LTE 1.6 520PP 98 1.09 Roll Trans PWSCC x 1-6 1 52 76 MCI 0.35 LTE 1.53 520PP 73 1.09 Roll Trans PWSCC x 1-6 1 53 80 MCI 0.54 LTE 1.57 520PP 99 1.1 Roll Trans PWSCC x 1-6 1 54 79 MCI 0.4 LTE 1.62 520PP 94 1.03 Roll Trans PWSCC x 1-6 1 56 77 SCI 0.78 LTE 1.59 520PP 98 0.51 Roll Trans PWSCC x 1-6 1 57 80 SCI 0.23 LTE 1.53 520PP 98 0.3 Roll Trans PWSCC x 1-6 1 58 79 SCI 0.4 LTE 1.63 520PP 89 0.44 Roll Trans PWSCC x 1-6 1 59 30 SCI 0.56 LTE 1.49 520PP 58 0.18 Roll Trans PWSCC x 1-6 1 62 79 MCI 0.75 LTE 1.65 520PP 31 1.18 Roll Trans PWSCC x 1-6 1 65 30 SCI 0.26 LTE 1.58 520PP 32 0.18 Roll Trans PWSCC x 1-6 1 65 30 SCI 0.72 LTE 1.5 520PP 46 0.21 Roll Trans PWSCC x 1-6 1 66 81 SCI 0.75 LTE 1.65 520PP 65 0.2 Roll Trans PWSCC x 1-6 1 73 75 SCI 0.61 LTE 1.52 520PP 98 0.11 Roll Trans PWSCC x 1-6 1 77 68 MCI 0.92 LTE 1.6 520PP 66 0.23 Roll Trans PWSCC x 1-6 1 77 69 SCI 0.52 LTE 1.5 520PP 68 0.31 Roll Trans PWSCC x 1-6 1 78 68 MCI 0.67 LTE 1.6 520PP 96 0.25 Roll Trans PWSCC x 1-6 1 82 56 SCI 0.96 LTE 1.53 520PP 64 0.4 Roll Trans PWSCC x 1-6 1 84 73 SCI 0.46 LTE 1.51 520PP 68 0.15 Roll Trans PWSCC x 1-6 1 84 75 MCI 0.7 LTE 1.59 520PP 51 0.18 Roll Trans PWSCC x 1-6 1 86 53 SCI 0.45 LTE 1.6 520PP 51 0.18 Roll Trans PWSCC x 1-6 1 86 54 MCI 1.09 LTE 1.59 520PP 68 0.73 Roll Trans PWSCC x 1-6 1 86 69 MCI 0.6 LTE 1.63 520PP 63 0.18 Roll Trans PWSCC x 1-6 1 87 74 MCI 0.41 LTE 1.73 520PP 66 0.2 Roll Trans PWSCC x 0.0589 1-6 1 89 59 SCI 0.79 LTE 1.61 520PP 48 0.23 Roll Trans PWSCC x 1-6 1 94 53 MCI 0.56 LTE 1.58 520PP 99 0.37 Roll Trans PWSCC x 1-6 1 98 93 SCI 0.43 LTE 1.58 520PP 52 0.23 Roll Trans PWSCC x 0.0544 1-6 1 100 70 MCI 0.4 LTE 1.6 520PP 63 0.2 Roll Trans PWSCC x 1-6 1 106 69 SCI 0.72 LTE 1.79 520PP 66 0.18 Roll Trans PWSCC x 1-6 1 142 26 SVI 1.87 UTE -2.35 520PP 47 0.27 10 Mechanical x 2-A 1 20 15 SCI 0.44 UTE -3.2 520PP 33 0.36 Reroll Trans PWSCC x 2-A 1 20 85 SCI 1.88 UTE -0.28 520PP 37 0.51 Tube End PWSCC x 2-A 1 44 61 SCI 0.95 UTE -1.94 520PP 68 0.21 Roll Trans PWSCC x 2-A 1 89 9 SCI 1.09 UTE -3.14 520PP 43 0.47 Reroll Trans PWSCC x 2-A 1 101 124 SCI 1.83 UTE -0.2 520PP 95 0.58 Tube End PWSCC x 2-A 1 104 107 SCI 0.83 UTE -2.98 520PP 77 1.22 Reroll Trans PWSCC x 2-A 1 133 1 SCI 0.84 UTE -0.26 520PP 81 0.23 Tube End PWSCC x 2-A 1 151 7 SCI 2.43 UTE -0.3 520PP 60 0.43 Tube End PWSCC x Page 4 of 11 Results as of : 6:57 AM,5/23/2012 Davis-Besse 17 RFO May Volumetric Indications (Not in Previously Rerolled DegMode 10 Mechanical Page 5 of 11 Results as of : 6:57 AM.5/23/2012 Davis*Besse 17 RFO May New Tube End Indications (Not in Previously Rerolled TSP Row SG Count UTE 45 2-A 1 UTE 84 1.83 2-A 2 0.87 UTE 142 2-A UTE 4 146 1.40 2-A UTE 1.64 2-A 5 36 UTE 1.22 64 2 2-A 6 122 104 2.17 UTE 7 2-A UTE 8 115 107 1.66 2-A 1.47 UTE 116 107 2-A 9 UTE 2-A 10 130 8 2.44 UTE -0.31 11 130 7 8AA 2.10 520PP 2-A MAA 1.83 -0.23 97 19 UTE 520PP 12 2-A UTE 49 8AA 0.86 -0.30 520PP 2-A 13 92 UTE 14 70 116 8AA 1.25 -0.27 520PP 2-A UTE 86 100 1.05 -0.26 520PP 15 2-A UTE 86 122 MAA 1.62 -0.38 520PP 2-A 16 UTE -0.25 17 86 123 MAA 1.58 520PP 2-A 1.34 UTE -0.24 520PP 18 87 100 8AA 2-A UTE -0.31 19 136 70 8AA 2.38 2-A 1.81 -0.33 136 68 MAA UTE 20 2-A UTE -0.33 137 72 MAA 1.96 21 2-A UTE -0.34 137 8AA 0.91 520PP 22 65 2-A UTE 138 1.86 -0.32 520PP 2-A 23 138 1.97 UTE -0.33 520PP 2-A 24 1.73 UTE -0.30 139 520PP 2-A 25 UTE -0.31 12 1.64 520PP 2-A 26 UTE -0.27 8 2.51 520PP 2-A 27 UTE 1.03 -0.29 6 520PP 2-A 28 3.18 UTE -0.24 520PP 2-A 29 5 UTE -0.32 121 0.72 520PP 2-A 30 0.81 -0.32 UTE 520PP 31 25 2-A UTE -0.10 65 3.11 520PP 2-A 32 UTE -0.28 2.35 520PP 2-A 33 3 UTE -0.32 34 2.08 520PP 5 2-A 2.49 UTE -0.20 520PP 2-A 35 9 -0.28 38 1.46 UTE 520PP 36 2-A 2-A UTE 1.01 -0.29 37 36 UTE -0.32 37 0.99 38 UTE 1.13 -0.34 33 2-A 39 24 1.34 UTE -0.24 2-A 40 UTE 84 2.36 -0.23 520PP 41 2-A -0.25 85 UTE 520PP 2-A 42 84 UTE -0.31 520PP 2-A 43 -0.31 44 108 UTE 520PP 2-A 108 UTE -0.31 520PP 2-A 45 12 UTE -0.35 46 520PP 2-A 13 UTE -0.38 2-A 47 520PP 14 UTE -0.37 2-A 48 520PP 18 UTE -0.27 2-A 49 520PP UTE -0.37 2-A 50 20 520PP -0.21 -0.20 -0.26

-0.23 -0.18 -0.28 -0.25

-0.23 -0.33 520PP Page 6 of 11 Results as of: 6:57 AM,5/23/2012 Davis-Besse 17 RFO May New Tube End Indications (Not in Previously Rerolled Row Tube Ind Volts TSP Inch1 25 52 8AA 1.59 UTE 25 59 8AA 1.32 UTE -0.31 81 12 MAA 1.17 UTE -0.07 82 9 MAA 1.32 UTE -0.25 82 20 MAA 1.10 UTE -0.30 86 20 8AA 1.49 UTE -0.25 82 21 8AA 1.44 UTE -0.21 86 10 8AA 2.46 UTE -0.21 520PP 89 10 MAA 1.04 UTE -0.22 520PP 25 77 8AA 2.08 UTE -0.29 520PP 28 83 8AA 1.95 UTE -0.31 520PP 29 83 8AA 1.99 UTE -0.25 520PP 26 47 8AA 1.92 UTE -0.28 520PP 33 92 8AA 1.04 UTE -0.28 520PP 26 87 8AA 1.99 UTE -0.29 520PP 5 30 MAA 3.11 UTE -0.38 520PP 32 8AA 2.06 UTE -0.32 520PP 72 MAA 1.93 UTE 73 8AA 1.18 UTE 47 8AA 1.68 UTE 47 8AA 1.53 UTE 93 8AA 1.39 UTE 78 8AA 1.24 UTE 8 MAA 2.09 UTE -0.29 38 8AA 1.38 UTE -0.16 2 2 MAA 1.45 UTE -0.31 520PP 2-A 4 8AA 1.14 UTE -0.24 520PP 2-A 107 MAA 2.07 UTE -0.31 520PP 2-A 3 8AA 2.43 UTE -0.34 520PP 2-A 4 MAA 1.13 UTE -0.25 520PP 2-A 6 MAA 2.09 UTE -0.23 520PP 2-A 25 8AA 1.15 UTE -0.27 520PP 2-A 42 8AA 1.18 UTE -0.27 520PP 2-A 7 MAA 2.26 UTE -0.29 520PP 2-A 5 8AA 2.33 UTE -0.27 520PP 2-A 111 MAA 1.49 UTE -0.22 520PP 2-A 105 MAA 1.63 UTE -0.24 520PP 2-A 110 8AA 1.50 UTE -0.26 520PP 2-A 106 8AA 2.64 UTE -0.25 520PP 2-A 104 MAA 1.66 UTE -0.26 520PP 2-A 105 8AA 1.91 UTE -0.30 520PP 2-A 98 8AA 1.20 UTE -0.25 20PP 2-A 27 8AA 2.03 UTE -0.24 20PP 2-A 12 MAA 1.64 UTE -0.30 20PP 2-A 22 8AA 0.99 UTE -0.33 OPP 2-A 12 8AA 1.57 UTE 520PP 2-A 19 8AA 2.43 UTE 2-A 17 8AA 1.79 UTE 2 3 13 8AA 2.82 UTE 2 147 45 8AA 1.05 UTE SG 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A 2-A Page 7 of 11 Results as of: 6:57 AM,5/23/2012 Davis-Besse 17 RFO May New Tube End Indications (Not in Previously Rerolled SG Count Row Tube Ind Volts TSP Inch1 Probe 2-A 101 111 2 MAA 1.35 UTE -0.27 520PP 2-A 102 110 1 SAA 2.11 UTE -0.33 520PP 2-A 103 109 3 MAA 2.56 UTE -0.31 520PP 2-A 104 109 5 SAA 0.99 UTE -0.31 520PP 2-A 105 107 5 UTE -0.30 520PP 2-A 106 107 3 1.04 U 520PP 2-A 107 105 22 SAA 1.49 UTE -0.28 520PP 2-A 108 102 6 SAA 1.74 UTE -0,14 520PP 2-A 109 90 6 SAA 1.86 UTE -0.27 520PP 2-A 110 62 54 SAA 0.98 UTE -0,38 520PP 2-A 111 44 5 SAA 1.11 UTE -0.24 520PP 2-A 112 44 4 SAA 1,85 UTE -0.16 520PP 2-A 113 120 13 I SAA 1.81 UTE -0,18 520PP 2-A 114 49 3 2.51 UTE -0,21 520PP 2-A 'm ' 6 1.39 UTE -0,22 520PP 2-A 11 1 89 1.21 UTE -0.26 520PP 2-A 117 10 5 1.52 UTE -0.29 520PP 2-A 1 48 7 SAA 1.25 UTE -0.27 520PP 2-A 1 130 71 SAA 1.52 UTE -0.34 520PP 2-A 120 136 80 SAA 1.67 UTE -0.31 520PP 2-A 121 109 94 SAA 1.43 UTE -0.29 520PP 2-A 122 109 110 SAA 1.66 UTE -0.40 520PP 2-A 123 109 112 SAA 0.88 UTE -0.30 520PP 2-A 124 110 105 MAA 2.70 UTE -0.21 520PP 2-A 125 126 78 MAA 1.73 -0.30 520PP 2-A lli=+/-=20 31 1.01 -0.31 520PP 2-A 1 19 39 1.57 -0.29 520PP 2-A 128 18 15 2.08 -0.35 520PP 2-A 129 127 83 2.08 U -0.28 520PP 2-A 130 131 74 2.22 -0.29 520PP 2-A 131 133 78 MAA 2.25 UTE -0.26 520PP 2-A 132 133 66 SAA 2.04 UTE -0.27 520PP 2-A 133 137 68 SAA 1.88 UTE -0.24 520PP 2-A 134 34 58 SAA 1.47 UTE -0.26 520PP 2-A 135 31 22 SAA 2.07 UTE -0.27 520PP 2-A 136 25 35 SAA 1.94 UTE -0.25 520PP 2-A l=Fi=t 1.03 UTE -0.37 520PP 2-A 132 68 1.76 -0.28 520PP 2-A 139 132 4 1.99 -0.32 520PP 2-A 140 146 28 SAA 2.09 UTE -0.31 520PP 2-A 141 124 11 SAA 1.34 UTE -0.22 520PP 2-A 142 97 8 MAA 2.28 UTE -0.30 520PP 2-A 143 122 100 SAA 2.47 UTE -0.29 520PP 2-A 144 123 101 MAA 2.65 UTE -0.26 520PP 2-A 145 129 8 SAA 1.62 UTE -0.33 520PP 2-A 146 115 98 SAA 1.68 UTE -0.28 520PP 2-A m 75 SAA 0.90 UTE -0.30 520PP 2-A 520PP 2-A o 0.30 520PP 2-A 150 135 68 MAA 0.71 -0.40 520PP Page 8 of 11 Results as of : 6:57 AM,5/23/2012 Davis-Besse 17 RFO May New Tube End Indications (Not in Previously Rerolled SG Count Tube Ind Volts TSP Inch1 Probe 2-A 151 4 SAA 2.39 UTE -0.26 520PP 2-A 152 2 SAA 2.43 UTE -0.28 520PP 2-A 153 64 MAA 2.12 UTE -0.28 520PP 2-A 60 SAA 2.25 UTE -0.32 520PP 1-8 120 SAA 1.97 UTE -0.44 52 1-8 110 SAA 2.27 UTE -0.11 5 1-8 67 MAA 1.18 UTE -0.26 520PP 1-8 119 SAA 1.12 UTE -0.32 520PP 1-8 113 SAA 1.23 E -0.23 520PP 1-8 117 SAA 1. -0.38 520PP 1-8 118 SAA -0.38 520PP 1-8 44 MAA -0.30 520PP 1-8 99 SAA -0.23 520PP 1-8 164 87 SAA -0.24 520PP 1-8 165 48 SAA -0.31 520PP 1-8 166 45 SAA -0.33 520PP 1-8 52 SAA -0.14 520PP 1-8 55 SAA -0.22 520PP 1-8 81 SAA -0.21 520PP 1-8 64 SAA 1. -0.22 520PP 1-8 66 SAA 1. -0.34 520PP 1-8 25 MAA 1. -0.30 460PP 1-8 79 MAA LTE 0.40 520PP 1-8 13 MAA UTE -0.32 520PP 1-8 112 SAA UTE -0.32 520PP 1-8 9 SAA UTE -0.29 520PP 1-8 5 SAA UTE -0.23 520PP 1-8 93 MAA UTE -0.25 520PP 1-8 53 SAA UTE -0.39 520PP 1-8 59 SAA UTE -0.28 520PP 1-8 49 SAA UTE -0.30 520PP 1-8 94 SAA UTE -0.31 520PP 1-8 39 SAA UTE -0.41 520PP 1-8 50 SAA -0.49 520PP 1-8 29 SAA -0.30 520PP 1-8 14 SAA -0.30 520PP 1-8 44 MAA -0.32 520PP 1-8 1 51 SAA -0.26 520PP 1-8 1 54 SAA UTE -0.25 520PP 1-8 190 95 SAA UTE -0.30 520PP 1-8 191 51 SAA 1.76 UTE -0.44 520PP 1-8 192 26 MAA 1.10 UTE -0.35 520PP 1-8 193 49 SAA 0.75 UTE -0.41 520PP 1-8 194 60 SAA 2.92 UTE -0.27 520PP 1-8 195 79 SAA 0.68 UTE -0.32 520PP 1-8 196 32 SAA 2.49 UTE -0.25 520PP 1-8 197 119 SAA 1.38 UTE -0.32 520PP 1-8 198 55 SAA 1.31 UTE -0.42 520PP 1-8 199 72 SAA 1.67 UTE -0.22 520PP 1-8 200 92 SAA 1.54 UTE -0.16 520PP Page 9 of 11 Results as of: 6:57 AM,5/23/2012 Davis-Besse 17 RFO May New Tube End Indications (Not in Previously Rerolled SG Count Row Tube Ind Volts TSP Inch1 Probe 1-8 201 42 90 SAA 2.10 UTE -0.23 520PP 1-8 202 13 50 SAA 1.57 UTE -0.27 520PP 1-8 203 13 52 SAA 1.69 UTE -0.26 520PP 1-8 204 28 II 1.73 UTE 520PP 1-8 205 56 2.66 UTE 520PP 1-8 206 57 AA 1.34 UTE -0.26 520PP 1-8 207 99 AA 1.24 UTE -0.23 520PP 1-8 208 10 2.14 520PP 32 98 1.13 I .31 520PP 3 27 SAA 1.17 UTE -0.26 520PP 1-8 211 7 40 SAA 1.86 UTE -0.25 520PP 1-8 212 98 27 SAA 1.04 UTE -0.29 520PP 1-8 213 48 76 MAA 1.06 UTE -0.27 520PP 1-8 214 58 99 MAA 0.79 UTE -0.28 520PP 1-8 215 55 109 SAA 1.02 UTE -0.35 520PP 1-8 216 55 97 SAA 1.24 UTE -0.21 520PP 1-8 217 48 78 MAA 2.07 UTE -0.35 520PP 1-8 218 36 88 SAA 1.90 UTE -0.27 520PP 1-8 219 107 7 SAA 0.92 I 520PP 1-8 220 38 102 SAA 1.75 UTE 520PP 1-8 221 38 112 SAA 1.17 UTE 520PP 1-8 222 39 89 SAA 2.07 UTE 520PP 1-8 223 42 71 SAA 0.93 U 520PP 1-8 224 43 75 MAA 1.64 U 520PP 1-8 225 43 107 SAA 1.48 UTE -0.24 520PP 1-8 226 52 78 SAA 1.09 UTE -0.30 520PP 1-8 227 57 53 SAA 1.91 UTE -0.31 520PP 1-8 228 146 15 MAA 2.02 UTE 3 520PP 1-8 229 147 13 SAA 2.22 UTE 3 520PP 1-8 230 58 78 SAA 1.91 UTE 7 520PP 1-8 231 60 81 SAA 1.09 U 520PP 1-8 232 16 0.90 U 2 520PP 1-8 233 18 1.07 U -.31 520PP 1-8 234 18 1.49 UTE -0.26 520PP 1-8 235 100 2.05 UTE -0.29 520PP 1-8 236 73 52 SAA 2.16 UTE -0.43 520PP 1-8 237 100 50 MAA 2.14 UTE -0.25 520PP 1-8 238 100 56 SAA 1.73 UTE -0.23 520PP 1-8 239 119 9 SAA 1.83 UTE -0.35 520PP 1-8 240 100 49 SAA 0.96 UTE -0.29 520PP 1-8 112 48 SAA 0.93 UTE -0.21 520PP 1-8 113 46 SAA 1.56 UTE -0.21 520PP Page 10 of 11 Results as of: 6:57 AM,5/23/2012 Davis-Besse 17 RFO May 2012 Top 10 Wear Calls By Bobbin Depth SG Row Tube Depth Volts TSP Inch1 Prev Depth 2-A 16 2 29 1.51 138 -0.70 21 1-8 67 1 26 1.71 128 -0.04 23 2-A 146 33 23 1.10 108 0.64 17 2-A 13 1 23 1.06 138 -0.67 16 2-A 147 36 23 1.11 108 0.66 23 2-A 12 2 21 0.84 138 -0.72 14 2-A 11 1 H-Too 138 -0.76 12 2-A 52 1 138 -0.64 20 2-A 86 127 18 0.73 148 -0.70 12 2-A 15 2 18 0.72 138 -0.73 13 Page 11 of 11 Results as of : 6:57 AM,5/23/2012 Davis-Besse 17RFO May 2.C(7) Steam Generator Tube Circumferential Crack S/G count Row Tube Ind Volts TSP 1-8 1 42 111 SCI 0.36 LTE 1-8 2 45 77 SCI 0.46 LTE 1-8 3 45 86 SCI 2.34 UTE 1-8 4 48 78 MCI 0.87 LTE 1-B 5 50 78 SCI 0.49 LTE l-B 6 51 79 MCI 0.27 LTE 1-B 7 52 76 MCI 0.35 LTE 1-8 8 53 80 MCI 0.54 LTE 1-8 9 54 79 MCI 0.4 LTE 1-B 10 56 77 SCI 0.78 LTE 1-8 11 57 80 SCI 0.23 LTE 1-B 12 58 79 SCI 0.4 LTE 1-8 13 59 30 SCI 0.56 LTE l-B 14 62 79 MCI 0.75 LTE 1-8 15 65 30 SCI 0.26 LTE 1-8 16 65 30 SCI 0.72 LTE 1-B 17 66 81 SCI 0.75 LTE 1-B 18 73 75 SCI 0.61 LTE 1-8 19 77 68 MCI 0.92 LTE 1-B 20 77 69 SCI 0.52 LTE 1-8 21 78 68 MCI 0.67 LTE 1-B 22 82 56 SCI 0.96 LTE 1-B 23 84 73 SCI 0.46 LTE l-B 24 84 75 MCI 0.7 LTE 1-8 25 86 53 SCI 0.45 LTE 1-B 26 86 54 MCI 1.09 LTE 1-B 27 86 69 MCI 0.6 LTE 1-8 28 87 66 SCI 0.48 LTE 1-8 29 87 70 MCI 0.29 LTE 1-B 30 87 74 MCI 0.41 LTE l-B 31 89 59 SCI 0.79 LTE 1-8 32 92 69 MCI 1.05 LTE 1-8 33 94 53 MCI 0.56 LTE 1-8 34 94 69 SCI 0.73 LTE 1-B 35 94 73 SCI 0.34 LTE 1-8 36 95 72 MCI 0.98 LTE 1-8 37 98 93 SCI 0.43 LTE 1-B 38 100 70 MCI 0.4 LTE 1-8 39 106 69 SCI 0.72 LTE 1-B 40 142 26 SVI 1.87 UTE 2-A 41 20 15 SCI 0.44 UTE 2-A 42 20 85 SCI 1.88 UTE 2-A 43 44 61 SCI 0.95 UTE 2-A 44 72 63 SCI 0.76 UTE 2-A 45 89 9 SCI 1.09 UTE 2-A 46 101 124 SCI 1.83 UTE 2-A 47 104 107 SCI 0.83 UTE 2-A 48 133 1 SCI 0.84 UTE 2-A 49 151 7 SCI 2.43 UTE Inch Probe %TW Ci Ext Degradation Mechanism 1.43 520PP 39 0.2 Roll Trans PWSCC 1.52 520PP 56 0.16 Roll Trans PWSCC -0.11 520PP 96 0.53 Tube End PWSCC 1.52 520PP 35 0.62 Roll Trans PWSCC 1.59 520PP 99 0.37 Roll Trans PWSCC 1.6 520PP 98 1.09 Roll Trans PWSCC 1.53 520PP 73 1.09 Roll Trans PWSCC 1.57 520PP 99 1.1 Roll Trans PWSCC 1.62 520PP 94 1.03 Roll Trans PWSCC 1.59 520PP 98 0.51 Roll Trans PWSCC 1.53 520PP 98 0.3 Roll Trans PWSCC 1.63 520PP 89 0.44 Roll Trans PWSCC 1.49 520PP 58 0.18 Roll Trans PWSCC 1.65 520PP 31 1.18 Roll Trans PWSCC 1.58 520PP 32 0.18 Roll Trans PWSCC 1.5 520PP 46 0.21 Roll Trans PWSCC 1.65 520PP 65 0.2 Roll Trans PWSCC 1.52 520PP 98 0.11 Roll Trans PWSCC 1.6 520PP 66 0.23 Roll Trans PWSCC 1.5 520PP 68 0.31 Roll Trans PWSCC 1.6 520PP 96 0.25 Roll Trans PWSCC 1.53 520PP 64 0.4 Roll Trans PWSCC 1.51 520PP 68 0.15 Roll Trans PWSCC 1.59 520PP 51 0.18 Roll Trans PWSCC 1.6 520PP 51 0.18 Roll Trans PWSCC 1.59 520PP 68 0.73 Roll Trans PWSCC 1.63 520PP 63 0.18 Roll Trans PWSCC 1.53 520PP 25 0.15 Roll Trans PWSCC 1.62 520PP 50 0.18 Roll Trans PWSCC 1.73 520PP 66 0.2 Roll Trans PWSCC 1.61 520PP 48 0.23 Roll Trans PWSCC 1.57 520PP 74 1.41 Roll Trans PWSCC 1.58 520PP 99 0.37 Roll Trans PWSCC 1.51 520PP 82 0.22 Roll Trans PWSCC 1.58 520PP 39 0.2 Roll Trans PWSCC 1.56 520PP 65 1.35 Roll Trans PWSCC 1.58 520PP 52 0.23 Roll Trans PWSCC 1.6 520PP 63 0.2 Roll Trans PWSCC 1.79 520PP 66 0.18 Roll Trans PWSCC -2.35 520PP 47 0.27 ID Mechanical

-3.2 520PP 33 0.36 Reroll Trans PWSCC -0.28 520PP 37 0.51 Tube End PWSCC -1.94 520PP 68 0.21 Roll Trans PWSCC -1.37 520PP 29 0.25 Roll Trans PWSCC -3.14 520PP 43 0.47 Reroll Trans PWSCC -0.2 520PP 95 0.58 Tube End PWSCC -2.98 520PP 77 1.22 Reroll Trans PWSCC -0.26 520PP 81 0.23 Tube End PWSCC -0,3 .152OPP 60 0.43 Tube End PWSCC Section a Section b x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Section c 0.05894 0.05439 Page 1 of 1 Resulls as 01: 2:40 PM. 5/29/2012 Enclosure 3

Mr Barry S. Allen Site Vice President FirstEnergy Nuclear Operating Company Davis-Besse Nuclear Power Station Mail Stop A-DB-3080 5501 North State Route 2 Oak Harbor, OH 43449-9760 DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO.1 -

SUMMARY

OF CONFERENCE CALL FOR STEAM GENERATOR TUBE INSERVICE INSPECTIONS FOR SPRING 2012 REFUELING OUTAGE (TAC NO. ME8477)

Dear Mr. Allen:

On May 23, 2012, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with FirstEnergy Nuclear Operating Company (FENOC), regarding the spring 2012 steam generator (SG) tube inservice inspections for refueling outage 17 (17RFO) at Davis-Besse Nuclear Power Station, Unit NO.1. A summary of the notes by the NRC staff of the May 23, 2012 conference call, is enclosed.

In addition, a handout provided by FENOC to support the conference call with inspection results and a License Condition 2.C(7) SG tube circumferential crack report are also enclosed.

The NRC staff did not identify any issues that would require follow-up action at that time; however, the NRC staff asked to be notified in the event any unusual conditions were detected during the remainder of the outage. Should you have any questions you can contact me at 301-415-3867.

Sincerely, I RA I Michael Mahoney, Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-346

Enclosures:

Summary of May 23, 2012 Conference Call Davis-Besse 17RFO SG Tube Inspection Tables Davis-Besse 17RFO License Condition 2.C(7) SG Tube Circumferential Crack Report cc w/encl: Distribution via Listserv RidsNrrLASRohrer RidsRgn3MailCenter AJohnson, by memo dated' LPL3-2 R!F RidsNrrDorlLpl3-2 Resource KKarwoski, NRR ADAMS Accession Nos. Package:ML 12167A026, Letter w/enclosure:ML12165A350, Enclosure 2:ML 12167A062,Enclosure3:ML 12167A262 1 LPL3-2/PM DE/ESGB LPL3-2/BC LPL3-2/PM OFFICE LPL3-2/LA GKulesa JZimmerman MMahoney SRohrer MMahoney NAME 6111112' 71 11 112 6128112 7116/12 DATE OFFICIAL RECORD COPY 6/28/12