ML111822717

Spring 2011 - 180 Day Steam Generator Report

ML111822717
Person / Time
Site:	Calvert Cliffs
Issue date:	06/30/2011
From:	John Stanley Calvert Cliffs 3 Nuclear Project, Constellation Energy Group, EDF Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
20004-018 51-9156712-000
Download: ML111822717 (30)

Text

Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 CENG.

a joint venture of 0Constellation Ener*y, 4"#, eDF CALVERT CLIFFS NUCLEAR POWER PLANT June 30, 2011 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit No. 2; Docket No. 50-318 Spring 2011 - 180 Day Steam Generator Report

REFERENCE:

(a) Calvert Cliffs Nuclear Power Plant Units 1 and 2 Technical Specification 5.6.9 In accordance with Reference (a), Attachment (1) provides the results of the steam generator tube inspection conducted on Calvert Cliffs Unit 2 in 2011. This report includes the number and extent of tubes examined and indications identified.

Should you have questions regarding this matter, please contact Mr. Douglas E. Lauver at (410) 495-5219.

- Engineering Services JJS/PSF/bjd

Attachment:

(1) Calvert Cliffs Unit 2, Spring 2011 - 180 Day Steam Generator Report cc: D. V. Pickett, NRC Resident Inspector, NRC W. M. Dean, NRC S. Gray, DNR AwlI

ATTACHMENT (1)

CALVERT CLIFFS UNIT 2, SPRING 2011 -

180 DAY STEAM GENERATOR REPORT Calvert Cliffs Nuclear Power Plant, LLC June 30, 2011

A 20004-018 (10/18/2010)

AREVA AREVA NP Inc.

ENGINEERING INFORMATION RECORD Document No.: 51 - 9156712 - 000 Calvert Cliffs Unit 2 -- U2R19 180-Day Report Page 1 of 28

A 20004-018 (10/18/2010)

Document No.: 51-9156712-000 AREVA Calvert Cliffs Unit 2 -- U2R19 180-Day Report Safety Related? [:] YES ONO Does this document contain assumptions requiring verification? [-] YES E NO Does this document contain Customer Required Format? -- YES 0 NO Signature Block Note: P/LP designates Preparer (P), Lead Preparer (LP)

R/LR designates Reviewer (R), Lead Reviewer (LR)

A/A-CRF designates Approver (A), Approver of Customer Requested Format (A-CRF)

A/A-CRI designates Approver (A), Approver - Confirming Reviewer Independence (A-CRI)

Page 2

A 20004-018 (10/18/2010)

Document No.: 51-9156712-000 AREVA Calvert Cliffs Unit 2 -- U2R19 180-Day Report Record of Revision Page 3

A Document No.: 51-9156712-000 AR EVA Calvert Cliffs Unit 2 -- U2R19 180-Day Report Table of Contents Page SIG NATURE BLOCK ................................................................................................................................ 2 RECO RD O F REVISIO N .......................................................................................................................... 3 LIST O F TABLES ..................................................................................................................................... 5 LIST O F FIG URES ................................................................................................................................... 6 1.0 180-DAY REPO RT ........................................................................................................................ 7

2.0 REFERENCES

............................................................................................................................ 19 APPENDIX A : SG21 FBW INDICATIONS ............................................................................................................ 20 APPENDIX B1: SG22 FBW INDICATIONS ...................................................................................................... 23 Page 4

A Document No.: 51-9156712-000 AR EVA Calvert Cliffs Unit 2 -- U2R19 180-Day Report List of Tables Page TABLE 1 - NDE TECHNIQUES UTILIZED FOR IDENTIFIED DEGRADATION ................................ 9 TABLE 2 - FOREIGN OBJECT W EAR ............................................................................................ 14 TABLE 3 - LIST OF TUBES PLUGGED DURING U2R19 ................................................................. 15 TABLE 4 - TUBE PLUGG ING SUM MARY ......................................................................................... 15 Page 5

A Document No.: 51-9156712-000 AREVA Calvert Cliffs Unit 2 -- U2R19 180-Day Report List of Figures Page FIGURE 1 - FAN BAR WEAR THROUGHWALL DEPTH DISTRIBUTION ....................................... 10 FIGURE 2 - SG21 FAN BAR WEAR LOCATIONS ............................................................................ 11 FIGURE 3 - SG22 FAN BAR WEAR LOCATIONS ............................................................................ 12 FIGURE 4 - SG21 FAN BAR WEAR CONDITION MONITORING .................................................... 17 FIGURE 5 - SG22 FAN BAR WEAR CONDITION MONITORING .................................................... 17 FIGURE 6 - SG21 AND SG22 LP WEAR CONDITION MONITORING ............................................ 18 Page 6

A ARE VA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report 1.0 180-DAY REPORT Calvert Cliffs Nuclear Power Plant Unit 2 U2R19 Spring 2011 Steam Generator Inspection During the Calvert Cliffs Nuclear Power Plant Unit 2 (CCNPP2) spring 2011 refueling outage (designated as U2R19), both of the steam generators (i.e., SG21 and SG22) were inspected in accordance with CCNPP Technical Specification (TS) 5.5.9. This was the third in-service inspection of the replacement steam generators (SGs), and the SGs had been operated for 7.45 effective full power years (EFPY) at the time of the inspection.

The discussion below summarizes the results of the inspection in accordance with the 180-day reporting requirements of Technical Specification (TS) 5.6.9. Bold wording restates the TS requirement, followed immediately by the required CCNPP2 information.

A report shall be submitted within 180 days after the initial entry into Mode 4 following completion of an inspection performed in accordance with the Specification 5.5.9, Steam Generator (SG) Program.

Initial entry into Mode 4 occurred on March 12, 2011; therefore, this report is required to be submitted by September 7, 2011.

The report shall include:

a. The scope of inspections performed on each SG

" Eddy Current Bobbin probe examinations (both SGs):

o 100% of all inservice tubes, full length, tube-end to tube-end.

o During the bobbin probe examination, in-service tubes bounding plugged tubes were examined for signs of tube-to-tube proximity or contact (resulting from severance of a plugged tube).

" Eddy Current Array probe examinations (both SGs):

o 100% of all inservice tubes, tube end to 1st lattice-support (both H/L and C/L).

o Since all of the in-service tubes were examined with Array probe from the tube-end to the 1 st lattice support, the following examinations were also satisfied by the Array probe examination: (Note that any loose parts or loose part indications outside of the Array probe examination range were examined using RPC. Additionally, any wear detected during the Array probe examination was also examined using RPC for characterization.)

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A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report

" Inspection of a one-tube border region around all tubes previously plugged due to foreign object wear and/or object remaining in the SG. This included 30 tubes plugged in SG21 during U2R18, and 29 tubes plugged in SG22 during U2R16.

" Inspection of all previous PLPs (part not removed) plus a one tube bounding examination of such tubes at the elevation of interest. This included 59 PLP tubes (plus the bounding tubes) returned to service in SG21 during U2R18, and 27 PLP tubes (plus the bounding tubes) returned to service in SG22 during U2R18.

" Inspection of all in-service tubes reported during the previous outage as NDD or LPS that were associated with foreign objects not retrieved during that outage, plus a one tube bounding examination of such tubes at the elevation of interest. This included 25 tubes (plus the bounding tubes) reported in SG21 during U2R18, and 30 tubes (plus bounding tubes) reported in SG22 during U2R18.

o The Array probe inspection data was also analyzed for expansion transition cracking at the hot and cold leg top of tubesheet (TTS)

Rotating eddy current probe examination (RPC) (both SGs):

" Pre-planned: Inspection of all in-service tube locations containing previously identified foreign object wear. This included 5 tubes in SG21 (all reported for the first time during U2R18) and, 6 tubes in SG22 (4 reported for the first time during U2R16 and 2 reported for the first time during U2R18).

o Special interest examinations:

• All bobbin probe and/or Array probe I-Codes.

• All newly-identified foreign object wear indications.

• All bobbin probe loose part indications plus a one tube bounding examination of such tubes that fall outside of the Array probe examination range.

• All bobbin probe lattice-support wear indications.

• Additional indications (e.g., fan bar wear, dents, dings) as needed to meet operational assessment requirements for tube integrity.

• Visual inspection of all installed tube plugs in both SGs in accordance with section 6.9 of the EPRI PWR Steam Generator Examination Guidelines, Rev 7. This included both welded and mechanical plugs.

• The following secondary side inspections were performed (both SGs):

o Secondary side visual inspections of tubesheet, including the inner bundle passes, the annulus, and the no-tube lane regions o Secondary side visual inspection of the 1 st lattice grid support o Targeted inspection of locations identified as PLP (Possible Loose Part) by ECT. See the latter part of Section "d" for an explanation of targeted inspections.

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A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report

b. Active degradation mechanisms found Two degradation mechanisms were identified during this examination: 1) fan bar wear, and 2) foreign object wear. No evidence of corrosion degradation processes, cracking, or lattice support wear was identified and no tubes were identified as being in close proximity to one another.

c. Nondestructive examination techniques utilized for each degradation mechanism The table below identifies NDE examination techniques utilized for each identified degradation mechanism.

Table I - NDE Techniques Utilized for Identified Degradation Degradation Inspection Type EPRI ETSS Mechanism Fan bar wear Bobbin 96004.1 (Rev. 13)

+PointTM 96910.1 (Rev. 10)

Foreign Object +PointTM 27901.1 (Rev. 0) **

Wear* (circ groove)

The Array probe was the primary means of detecting foreign objects and foreign

+ *TM object wear during the inspection. However, the +Point probe was used for sizing wear.

• • There are other EPRI techniques qualified for sizing of foreign object wear depending on the shape of the flaw. ETSS 27901.1 was selected based on the circumferential groove appearance of the foreign object wear indications detected during the U2R1 9 inspection.

d. Location, orientation (if linear), and measured sizes (if available) of service induced indications Fan bar wear (FBW) is a mechanical degradation process which produces volumetric tube wear at the interface between the U-bend anti-vibration supports (fan bars) and the tubes. In total, 358 fan bar wear (FBW) indications in 274 tubes were identified in the CCNPP2 steam generators during the U2R19 inspection. Although none of the reported indications exceeded the Technical Specification plugging limit of 40%TW, the three largest FBW indications (all in SG22) were preventatively stabilized with full-length stabilizers, and the tubes were plugged. Although the full length stabilizer is not required to span the entire tube length, it is required to span the tube length on the insertion leg side (hot leg) from the top of the plug over the u-bend and past the 5 th support on the opposite leg for the largest tube row (row 138) in the bundle.

Thirty-one of the 358 indications were newly reported during U2R19. This represents an increase of about 10% since the last inservice inspection in 2009 (U2R18). The maximum depth reported was a 32%TW indication in SG22. The largest newly-reported indication was an 18%TW indication in SG22.

Figure 1 provides the distribution of fan bar wear depths for both steam generators as reported with the Page 9

A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report bobbin coil probe. As shown in the figure, SG22 contained more indications and also contained the majority of indications that were greater than 20%TW.

Figures 2 and 3 provide tube map locations of the reported FBW. Although the tube maps shown in Figures 2 and 3 provide a view of the tubesheet primary face from the hot leg side, both the hot leg and cold leg FBW indications are included on each map. Most of the wear continues to occur in longer tubes (i.e., larger ubend radius), clustered towards the center-most tube columns.

Figure 1 - Fan Bar Wear Throughwall Depth Distribution Page 10

A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report Figure 2 - SG21 Fan Bar Wear Locations GRWOP NOES Calvert Cliffs Unit 2 . Bw~o,. 9 2R19- FEB 2011 Fan Bar Wear Indications (9 Et " tube s w ithne wF &W6 tubes vw th out p n orF BW* 3 tubes wi l nweOF Wan d p7100 FB W atddt e ln, o ct w S C ALE 0 OO3I8)

$10 21 TOTAL T*SES 8471 "

• 073I NOT2 SELECTED TUBES 91 PRMAYOAC OJT OFSERV1E (0) 37 NOZZLE ifi ilto

.. . . ... .... 40+

'ofo 040 130 120 110 Go so .0 30 20 10 MANWAY Page 11

A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R1 9 180-Day Report Figure 3 - SG22 Fan Bar Wear Locations 60Oup

'nFOW2D1I now 20 Calvert Cliffs Unit 2 ;fFfBW 2V1 1132 172 2R19- FEB 2011 Fan Bar Wear Indications (20 ttat tubes with new FBW 13 tubes wthout pnm F5W 7 tubes with new FPW and nowFOW at ddent location)

SG 22 TOTAL TLOE:S 8471 SAE0OM HOT SELECTED TUBES 186 Won May Oa 14 26 25 2011 PROMA~y FACE OUT OF SER~VCE (0) 32 NOZZLE ISO I20~ t*D 120 ItO II.

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,041 00 Ila Wo 130 120 Ila In tO10 12 20 SOI060 40 20 20 to MANWAY Page 12

A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report During the U2R19 inspection, 17 indications of foreign object wear were detected in 14 tubes within the two SGs (see Table 2). These indications were reported as LPW (Loose Part Wear) in the eddy current database. Five (5) indications in three tubes were newly-detected in SG21 during U2R19. The remaining indications in SG21, and all indications in SG22, were identified during prior inspections, and were pre-planned for re-inspection during U2R19. All LPW indications were sized below the site plugging limit. None of the foreign objects that caused the newly-detected LPW in 2011 was present at the LPW tube location. Nor were objects present at non-plugged LPW tube locations from previous outages. Since no objects were present to cause further wear and all LPW %TWs were less than the 40% tech spec plugging limit, all 14 tubes were returned to service.

Due to the large number of LPW indications and foreign objects detected at CCNPP2 in-the past, a concerted effort was undertaken during U2R19 to detect and remove as many foreign objects as possible. A 100% examination of both SGs was performed with the Array probe from the tube end to the first support in each leg. This provided the most thorough inspection possible for detection of foreign objects from the tubesheet up to the first support in both legs. As a result, 343 Potential Loose Part (PLP) indications were reported in SG21, and 203 were recorded in SG22. It should be noted that these quantities represent the initial number of PLP indications in the ECT database. Upon inspecting a location, the indication code was subsequently changed to LPS (Loose Parts Signal) if no loose part was found by visual inspection, or LPR (Loose Part Removed) if any object (including a sludge rock) was found and removed from the SG. Thus the stated quantities are actually the sum of PLP, LPS and LPR calls remaining in the database.

With certain justified exceptions (Refs. I and 2), all PLP indications were visually investigated by secondary side inspection personnel. This included loose parts left in service from the previous (2009) inspection. PLP locations that were not visually inspected were justified by a separate engineering evaluation. The evaluation divided the bundle into two parts: the 12-tube periphery ring and all tubes bounded by the periphery ring, (i.e., the inner bundle region). PLP indications located within the inner bundle region were further divided into two classifications, IBS (inner bundle single) and all other. IBS indications are defined as PLP indications located in a single tube without a PLP indication in an adjacent bounding tube. Since IBS indications were judged to be less of a concern regarding tube integrity, (compared to two or more adjacent PLP tubes), visual inspection of IBS tubes was not required. Of the 343 PLP indications detected in SG21, 92 of them were classified as IBS indications.

Accordingly, of the 203 PLP indications detected in SG22, 69 of them were classified as IBS indications. The majority of PLPs were caused by sludge rocks and/or scale. Numerous metallic objects were removed, and three small pieces of wire were left in SG22 secondary side.

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A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report Table 2 - Foreign Object Wear Eddy Measured New Loose Current Length (in.) in Part SG Row Col Ind %TW Supp Elevation Technique Axial XCirc 2011 Detected 21 12 66 LPW 29 TSH +0.12 27901.1 0.21 x 0.33 Yes No 21 12 66 LPW 23 TSH +0.42 27901.1 0.18 x 0.31 Yes No 21 12 162 LPW 27 TSH +0.04 27901.1 0.18 x 0.33 No No 21 13 65 LPW 28 TSH +0.01 27901.1 0.21 x0.23 Yes No 21 14 66 LPW 18 TSH +0.50 27901.1 0.15 x 0.25 Yes No 21 14 66 LPW 18 TSH +0.60 27901.1 0.12 x 0.27 Yes No 21 72 146 LPW 34 TSH +0.15 27901.1 0.13 x 0.35 No No 21 75 147 LPW 19 TSH +18.07 27901.1 0.25 x 0.25 No No 21 77 147 LPW 22 TSH +17.70 27901.1 0.24 x 0.29 No No 21 77 149 LPW 21 TSH +20.71 27901.1 0.21 x 0.39 No No 22 14 4 LPW 24 TSC +0.47 27901.1 0.20 x 0.35 No No 22 17 1 LPW 24 TSC -0.02 27901.1 0.20 x 0.27 No No 22 18 2 LPW 25 TSC +0.10 27901.1 0.24 x 0.31 No No 22 112 82 LPW 24 05H -4.02 27901.1 0.31 x 0.35 No No 22 124 116 LPW 17 01C -11.40 27901.1 0.27x0.27 No No 22 126 116 LPW 37 01C -11.27 27901.1 0.27 x 0.27 No No 22 126 116 LPW 23 01C -11.54 27901.1 0.24 x 0.27 No No Page 14

A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report

e. Number of tubes plugged during the inspection outage for each active degradation mechanism Three tubes in SG22 were plugged during U2R19 (see Table 3). All of the tubes were preventatively stabilized and plugged due to Fan Bar wear. The tubes are labeled as PTP (Preventive Tube Plug) in the ECT database. No tubes were plugged in SG21 during the 2011 refueling outage.

Table 3 - List of Tubes Plugged During U2R19 SG Row Col Hot Leg Cold Leg Reason for Tube Repair SG22 109 73 ROLLSTAB ROLLED PTP@F06-1.35 SG22 99 83 ROLLSTAB ROLLED PTP@F06+0.02 SG22 101 83 ROLLSTAB ROLLED PTP@F06-0.02 PTP = Preventative Tube Plug ROLLSTAB=Stabilizer and Rolled Plug

f. Total number and percentage of tubes plugged to date Table 4 provides the post-U2R19 tube plugging status of the CCNPP2 SGs. There are currently 37 tubes plugged in SG21 and 32 tubes plugged in SG22.

Table 4 - Tube Plugging Summary SG Tubes Installed Tubes Plugged To-Date SG21 8,471 37 (0.437%)

SG22 8,471 32 (0.378%)

Total 16,942 69 (0.407%)

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A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R1 9 180-Day Report

g. The results of condition monitoring, including the results of tube pulls and in-situ testing The condition monitoring assessment is summarized in Figures 4 through 6. These figures provide the condition monitoring limit curves corresponding to the NDE technique employed for each degradation type. All reported degradation falls below the applicable condition monitoring curve and therefore satisfies the Technical Specification structural performance criteria.

Note that Figures 4 and 5 display the U2R1 9 FBW depths at a bounding 1.8 inch length for SGs 21 and 22 respectively. Also presented in each figure are the five deepest FBW indications sized using RPC.

The five deepest were selected since larger axial lengths are typically associated with deeper FBW.

The measured RPC length for these indications is plotted to demonstrate that the 1.8 inch length remains bounding. Because the RPC length measurements were not adjusted to compensate for rotating coil field spread effects, the indicated length values are considered to be overestimates of the actual lengths, thus adding to the conservatism for the 1.8 inch bounding length.

For volumetric indications, meeting the structural performance criteria also provides reasonable assurance that the accident leakage performance criteria would be satisfied at the steam line break pressure differential which is less challenging than the pressure differential required to demonstrate compliance with the structural performance criteria. Since this conclusion could be reached analytically using NDE inspection results with a full accounting of significant uncertainties, no in-situ pressure testing was required to demonstrate structural and leakage integrity, and no tubes were removed from the SGs for destructive examination. During the past operating cycle, no measurable primary-to-secondary leakage was observed, therefore the operational leakage performance criteria was satisfied.

The results of the 2011 inspection and the condition monitoring assessment confirm that the 2009 operational assessment was appropriately bounding.

h. The effective plugging percentage for all plugging in each SG There are no sleeves installed in the CCNPP2 steam generators, therefore the effective plugging percentage is the same as stated in (f) above.

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A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report Figure 4 - SG21 Fan Bar Wear Condition Monitoring 100 90 CM Limit - ETSS 96004.1 Wear Depth - 1.8 in. Bounding Length 80 A Wear Depth - Measured Length 70 60 50 I

40 30 20 10 A

&

AA A

• I 00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1,3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 Axial Length (in)

Figure 5 - SG22 Fan Bar Wear Condition Monitoring 100 90 - CM Limit - ETSS 96004.1

• Wear Depth - Assumed Bounding Length 80 A Wear Depth - Measured Length 70 60 50 I 40 30 -

20 -

10 0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 Axial Length (in)

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A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report Figure 6 - SG21 and SG22 LP Wear Condition Monitoring 80 70 60 5o S CMLimit ETSS 27901.1

• SG21 Loose Part Wear x1 40 A SG22 Loose Part Wear A

30 AA 20 0 0A 10 0

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Axial Length (in)

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A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report

2.0 REFERENCES

1. AREVACR2011-1545

2. AREVA CR 2011-1547

3. AREVA, "Calvert Cliffs Unit-2 Condition Monitoring at 2R19 (Spring 2011) and Preliminary Operational Assessment for Cycles 19 and 20," 51-9156699-000, March 8, 2011

4. AREVA, "Technical Summary Calvert Cliffs Unit#2 2R19 Eddy Current Examination," 51-9157178-000, May 10, 2011

5. AREVA, "Calvert Cliffs Nuclear Power Plant Unit 2, SG Degradation Assessment, Spring 2011 /2R19," 51-9153318-000, February 15, 2011 Page 19

A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report APPENDIX A: SG21 FBW INDICATIONS SG21 34 6 TWD 9 F06 -1.4 SG21 45 79 TWD 5 F07 0.92 SG21 57 107 TWD 19 F08 1.69 SG21 58 98 TWD 5 F05 -1.82 SG21 63 69 TWD 9 F09 2.16 SG21 69 115 TWD 9 F04 -1.9 SG21 75 75 TWD 6 F08 0.75 SG21 77 75 TWD 6 F08 0.71 SG21 77 79 TWD 18 F08 0.75 SG21 77 83 TWD 10 F08 0.78 SG21 80 74 TWD 4 F08 2.03 SG21 80 76 TWD 14 F07 -0.81 SG21 80 78 TWD 9 F08 1.99 SG21 81 75 TWD 13 F08 0.77 SG21 81 79 TWD 13 F08 0.92 SG21 82 94 TWD 7 F08 0.81 SG21 83 67 TWD 11 F08 0.77 SG21 83 79 TWD 10 F08 0.92 SG21 83 97 TWD 6 F08 2 SG21 84 76 TWD 14 F07 -0.81 SG21 85 75 TWD 7 F08 0.83 SG21 85 75 TWD 5 F07 1.79 SG21 85 79 TWD 13 F08 0.94 SG21 85 93 TWD 11 F08 1.91 SG21 86 84 TWD 12 F06 -0.72 SG21 86 94 TWD 8 F08 0.74 SG21 87 75 TWD 16 F08 0.81 SG21 87 75 TWD 9 F07 1.75 SG21 87 79 TWD 9 F08 0.76 SG21 87 83 TWD 14 F06 0.48 SG21 87 87 TWD 8 F08 1.97 SG21 87 93 TWD 10 F08 2.02 SG21 87 97 TWD 7 F08 1.93 SG21 88 78 TWD 9 F06 1.24 SG21 89 75 TWD 13 F06 -0.59 SG21 89 87 TWD 10 F08 1.33 SG21 89 87 TWD 7 F07 0.72 SG21 90 74 TWD 7 F08 2.02 SG21 91 75 TWD 9 F08 0.81 SG21 92 78 TWD 11 F08 1.99 SG21 93 73 TWD 14 F08 0.74 SG21 93 83 TWD 9 F06 -0.62 SG21 94 74 TWD 9 F06 -1.83 Page 20

A ARE VA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report SG Row Cdf :d AM TW 'SgUpp. 1InchI SG21 94 78 TWD 14 F08 1.94 SG21 94 82 TWD 9 F06 -1.49 SG21 95 83 TWD 15 F08 -0.59 SG21 95 83 TWD 13 F07 -0.57 SG21 95 87 TWD 16 F08 1.92 SG21 95 87 TWD 8 F09 0.74 SG21 95 99 TWD 6 F05 -1.3 SG21 96 78 TWD 7 F08 1.58 SG21 97 73 TWD 10 F08 0.66 SG21 97 75 TWD 9 F06 -0.61 SG21 97 75 TWD 8 F07 1.82 SG21 97 83 TWD 9 F08 0.5 SG21 97 83 TWD 6 F07 -0.07 SG21 98 74 TWD 9 F06 -1.55 SG21 98 74 TWD 6 F08 1.99 SG21 98 82 TWD 7 F06 -1.81 SG21 98 82 TWD 7 F08 1.99 SG21 98 88 TWD 6 F08 0.66 SG21 99 75 TWD 12 F07 1.73 SG21 99 83 TWD 14 F06 -0.52 SG21 99 83 TWD 14 F08 -0.63 SG21 99 83 TWD 11 F07 -0.61 SG21 99 87 TWD 13 F06 -1.38 SG21 100 80 TWD 6 F06 -1.33 SG21 101 75 TWD 16 F06 -0.7 SG21 101 75 TWD 12 F07 1.64 SG21 101 75 TWD 6 F09 -1.49 SG21 101 79 TWD 8 F06 -0.46 SG21 101 79 TWD 8 F08 0.74 SG21 101 79 TWD 7 F02 -1.6 SG21 101 79 TWD 6 F07 1.6 SG21 101 83 TWD 10 F07 -0.48 SG21 101 83 TWD 9 F08 -0.39 SG21 101 87 TWD 10 F07 0.66 SG21 101 87 TWD 7 F06 -1.53 SG21 102 82 TWD 5 F07 -1.43 SG21 102 88 TWD 6 F06 -0.55 SG21 102 90 TWD 7 F06 -0.61 SG21 103 83 TWD 12 F06 0.46 SG21 103 87 TWD 12 F07 0.92 SG21 104 78 TWD 7 F08 1.88 SG21 104 78 TWD 6 F07 0.79 SG21 104 84 TWD 7 F06 -0.48 SG21 104 86 TWD 4 F06 -0.52 SG21 104 88 TWD 20 F05 -1.5 SG21 104 88 TWD 19 F06 -1.1 SG21 104 88 TWD 6 F07 1.77 Page 21

A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report SG21 105 79 TWD 6 F07 1.96 SG21 105 83 TWD 12 F07 0.02 SG21 105 87 TWD 7 F07 0.66 SG21 106 76 TWD 22 F06 1.34 SG21 106 76 TWD 8 F07 -0.72 SG21 106 78 TWD 6 F07 0.7 SG21 106 90 TWD 7 F06 -0.55 SG21 107 75 TWD 9 F07 1.71 SG21 107 83 TWD 14 F06 0.46 SG21 107 83 TWD 10 F07 -0.11 SG21 107 87 TWD 16 F07 0.99 SG21 108 76 TWD 24 F06 1.01 SG21 108 90 TWD 16 F06 -0.81 SG21 110 76 TWD 7 F06 0.72 SG21 110 88 TWD 7 F06 -0.63 SG21 110 90 TWD 8 F06 -0.24 SG21 111 75 TWD 19 F06 -0.72 SG21 112 90 TWD 18 F06 -0.79 SG21 113 87 TWD 7 F07 0.74 SG21 114 76 TWD 12 F06 -0.72 SG21 117 89 TWD 15 F06 -1.62 LSG21 119 87 TWD 14 F07 0.81 Page 22

A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report APPENDIX B: SG22 FBW INDICATIONS SG Row TWd %Tw. F06p .Inchi SG22 37 35. TWD 4 F07 1.85 SG22 49 9 TWD 7 F07 1.88 SG22 57 -127. TWD 5 -1.95 SG22 69 83 TWD 7 F08 -0.56 SG22 70 82 TWD 11 F06 -1.92 SG22 70 82 TWD 9 F07 0.86 SG22 72 72 TWD 9 F08 1.99 SG 22 72 92 TWD 13 F08 0.81 SG22 73 81 TWD 7 F07 -1.25 SG22 73 91 TWD 14 F08 1.93 SG22 74 82 TWD 7 F06 -1.72 SG22 74 82 TWD 6 F08 2.03 SG22 74 82 TWD 5 F07 0.74 SG22 74 94 TWD 9 F08 0.89 SG22 75 73 TWD 8 F08 0.82 SG22 76 72 TWD 17 F08 1.95 SG22 76 72 TWD 10 F06 -1.84 SG22 76 82 TWD 12 F06 -1.33 SG22 76 82 TWD 11 F08 2.02 SG22 76 82 TWD 8 F07 0.85 SG22 76 98 TWD 10 F08 0.86 SG22 77 65 TWD 10 F08 0.78 SG22 77 73 TWD 8 F08 0.98 SG22 77 81 TWD 6 F07 -0.81 SG22 78 64 TWD 7 F08 1.95 SG22 78 82 TWD 11 F06 -1.84 SG22 79 81 TWD 14 F07 -0.78 SG22 79 93 TWD 26 F08 1.44 SG22 80 64 TWD 12 F09 -1.94 SG22 80 80 TWD 9 F06 -1.61 SG22 80 82 TWD 9 F06 -1.95 SG22 80 82 TWD 8 F05 -0.63 SG22 81 91 TWD 8 F08 2.07 SG22 82 82 TWD 10 F07 1.29 SG22 82 82 TWD 7 F06 -1.83 SG22 82 84 TWD 9 F08 1.29 SG22 82 84 TWD 8 F06 1.44 SG22 82 94 TWD 7 F08 0.79 SG22 83 73 TWD 21 F08 0.83 SG22 83 75 TWD 12 F02 1.03 SG22 83 81 TWD 19 F07 -1.17 SG22 83 91 TWD 14 F08 1.99 SG22 84 80 TWD 11 F06 -1.81 Page 23

A ARE VA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report SG22 _84 92 . TWD 17 F08 0.8 SG22 84 94 TWD 18 F*8 0.83

-SG22 -85 -79 TWD- 9 F08 0.94 SG22 86 72 TWD 11 F06 -1.59 SG22 72 TWD _9 F05- -0.76 SG22 86 TWD 9 F06 -1.56 SG22 86 92 TWD- 9 F08 0.83 SG22f 86 94 TWD 13 FOB _0.87 SG22 87 TWD 16 F08 0.78 SG22 87 83 TWD 22 F07 -0.02 SG22 87 83 TWD _ 15 F08 0.02 SG22 87 83--

8 _TWD 77F06 0.5 SG22 88 76 TWD-_ 9 F06 1.94 SG22 88 78_.. TWD 10 F06 -1.29 SG22 88 82 TWD - 12 F06 1.3 SG22 88 82 TWD 11 F0 5 1.83 SG22 88 84 TWO 6 F07 -0.72 SG22 88 -_92 TWD 11 - F08 0.85 SG22 89 65 TWD -14 F08 1.07_

SG22 89 -- 69 TWD 11 F08 1 SG22 89 73 TWD 18 F0 -0.91 SG22 89 83 TWOD- - FO6 __-10.25 SG22 89 83 TWD -0.55 SG22 89 83 TWOD 7 F05 -0.39 SG22 89 783 TWD 6

6. F07 0.57 SG22 89 89 TWD 5 FOB -1.27 SG22 90 821 TWD 6 F06 -1.83 SG22 91 65 TWD 20 FOB 0.87 SG22 91 83 TWD 7 F07 -0.46 SG22 92 76 TWD 11 F06 1.88 SG22 93 73 TWD 67 F06 -0.7 SG22 93 79 TWD 17 F06 -10.68 SG22 93 81 TWD F05 -0.74 SG22 934_ 83 TWD 10 F07 0.5 SG22 93 83 TWD 91 F06 0.48 SG22 94 76 TWD 7 7 F06 -1.58

-SG22 -. 94 80 -TWO -7 -F06 -1.73 SG22 94 82 TWO -14 F06 -1.81 SG22 94 82 TWD 6 F07 0.87 SG22 94 86 TWD 8 F06 0.85 SG22 94 92 TWO 10 F08 0.89 SG22 95 81 TWO 8 F07 -1.22 SG22 95 83 TWO 10 F07 _-0.52 SG22 95 83 TWO 7 F06 0.59 SG22 96 80 TWD 10 F06 -1.79 SG22 96 82 TWD 9 F06 1.3 Page 24

A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R1 9 180-Day Report S -G .Row %TW SG22 96 82 ITWD F07 -1.49 SG22 96 84 TWD - 17 F07 1.35

-SGi22- 96 86 TWD 9 F06 -1.05 SG22 96 90 TWD --14 F08 -1.31 SG22 97 73 TWD 8 F06 -0.72 TWD SG22 97 75 7 F06 -0.5 TWD SG22 97 77 7 F06 -0.72 SG22 97 79 TWD 7 F06 -0.61 SG22 -97 81 TWD 8 F07 -1.27 SG22 97 81 TWD 3 F06 1.38 SG22 97 81 TWD 3 F08 -1.53 SG22 98 72 TWD 6 F08 1.92 SG22 98 76 TWD 7 F06 1.71 SG22 98 78 TWD 10 F08 2.08 SG22 98 82 TWD 7 F07 0.9 SG22 99 71 TWD 13 F08 -0.81 99 73 TWD 7 F07 1.93 SG22 99 77 TWD 18 F06 -1.02 SG22 99 83 TWD 28 F06 0.07 SG22 99 83 TWD 15 F05 0 SG22 100 76 TWD 8 F06 -1.79 SG22 100 78 TWD 11 F08_ -1.85 SG22 100 78 TWD 6 F06 -1.51 SG22 100 82 TWD 23 F06 -1.21 SG22 100 82 TWD 16 F07 0.91 SG22 100 82 TWD 9 F08 1.8 SG22 100 84 TWD _ 8 F07 1.95 SG22 100 88 TWD _ 11 F07 1.86 SG22 101 77 TWD 9 F06 -0.67 SG22 101 79 TWD 7 F07 1.84 SG22 101 83 TWD 30 F06 0.09 SG22 101 83 TWD 23 F07 0.09 SG22 101 83 TWD 9 F05 0.04 SG22 101 85 TWD 6 F09 1.42 SG22 101 87 TWD 7 F07 0.76 SG22 101 87 TWD 6 F04 0.7

_SG22 102 76 TWD 12 F07 -1.27 SG22 102 76 TWD 7 F06 1.77 SG22 102 82 TWD 8 F09 0.85 SG22 102 82 TWD 7 F06 -1.77 SG22 102 84 TWD 5 F07 1.94 SG22 102 86 TWD 6 F02 0.9 SG22 103 77 TWD 16 F06 -0.61 SG22 103 79 TWD 10 F06 -0.62 SG22 103 79 TWD 9 F07 1.96 SG22 1 1031 811 TWD 1 9 1F08 [ -1.31 Page 25

A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report SG22 103 83 TWD 17 F06 -0.06 SG22 103 83 TWD-I 7 F05 -0.52 SG22 103 83 TWD 7 FO7 -0.13 SG22 103 85 TWD 10 F08 1.4 SG22 103 87 TWD 12 F07 0.7

_SG22 104 82 _TWD V F06 -1.76 SG22 104 82 TWD 11 F07 0.74 SG22 104 84 TWD 12 F07 1.84 SG22 104 94 TWD 14F06 -1.15 SG22 105 67 TWD 9 F07 -1.31 SG22 105 75 TWD 9 F06 -0.74 SSG22 105 77= TWD_ 11 F06 -0.74 SG22 105 79j TWD 17 F06 -0.59 SG22 105 79 TWD 11 F07- 1.75 SG22 105 81 TWD 14 F08 1.35 SG22 105 81 TWD 9 F06 -0.74 SG22 105 81 TWD 6 F07 1.81 SG22 105 83 TWD 15 F07 _ 0.57 SG22 -105-5 83 TWD 13 FO5 -0 SG22 105 83 TWD 8 F06 _ 0.04 SG22 105 87 TWD 7 F01 0.61 SG22 106 80 TWD 8 F07 1.44 SG22 106 82 TWD 17 F07 0.79 SG22 106 82 TWD 11 F06 -1.72 SG22 106 84 TWD _ 6 F08 -1.42 SG22- 106 ----90 TWD 18 F07 1.39 SG22 107 75 TWD _ 14 F06 -0.79 SG22 107 -- 77 TWD _ 14 F-06 --0.76.

SG22 107 79 TWD 9 F06 -0.75 SG22 107 81 TWD 22 F06 -0.74 SG22 107 81 TWD 12 F08 -1.26 SG22 107 83 TWD F07 0.07 SG22 107 83 TWD 5 F06 _ 0.02 SG22 107 83 TWD 4 EQS 0.12 SG22 107 85 TWD 18 F09 0.7 SG22 107 93 TWD 11 F07 0.81 SG22 108 74 TWD 7 F06 -1.9 SG22 108 76 TWD 14 F08 1.72 SG22 108 82 TWD 21 F07 0.81 SG22 108 82 TWD 16 F09 0.87 SG22 108 82 TWD 10 F08 1.68 SG22 108 84 TWD 14 F07 1.82 SG22 108 84 TWD 13 F06 -0.61 SG22 108 86 TWD 23 F06 -1.03 SG22 108 86 TVD 15 F07 1.25 SG22 108 86 TWD 6 F08 1.33 Page 26

A AREVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R1 9 180-Day Report 9G- IJ-Row mld. %TW SG22 108 90 TWD 7 F06 -0.7 SG22 _ 109 73 TWD 32 F06 -1.2 SG22 109 75 TWD 13 F06 -0.83 SG22 109 77 TWD 18 F06 -0.66 SG22 109 79 TWD 21 F06 -0.72

-SG22 _109 81 TWD 14 F08 -1.46 SG22 109 81 TWD 12 F06 -0.74 SG22 109 81 TWD 6 1F07 -1.18 SG22 109 83 TWD 5 F06 0.56 SG22 109 85 TWD 17 F07 -1.33

-SG22 109 87 TWD 11 F07 0.87 SG22 110 78 TWD 9 F07 0.72 SG22 111 73 TWD 27 F06 -1.25 SG22 111 75 TWD 22 F06 -0.7 SG22 77 TWD 27 F06 -0.85 111 SG22 79 TWD 19 F06 -0.69 111 SG22 111 79 TWD 11 F07 1.83 SG22 81 TWD 14 F06 -0.74 SG22 112 72 TWD 10 F08 1.88 SG22 112 78 TWD 12 F07 0.79 SG22 75 TWD 8 F06 -0.81 113 SG22 77 TWD 26 F06 -1.22 113 SG22 81 TWD 19 F06 -1.16 113 SG22 83 TWD 9 F07 0.61 SG22 113 83 TWD 7 F06 0.5 SG22 113 91 TWD 18 F02 -1.91 SG22 114 76 TWD 5 F06 1.32 SG22 114 78 TWD 12 F07 0.75 SG22 114 82 TWD 8 F06 1.33 SG22 114 84 TWD 12 F06 -1.18 SG22 114 88 TWD 15 F05 1.28 SG22 115 73 TWD 9 F06 -0.68 SG22 115 77 TWD 9 F06 -0.68 SG22 115 81 TWD 7 F06 1.28 SG22 115 81 TWD 6 F07 -1.22 SG22 115 83 TWD 6 F06 0.57 SG22 115 83 TWD 6 F07 0.63 SG22 115 93 TWD 12 F07 0.88 SG22 116 82 TWD 22 F07 1.25 SG22 116 84 TWD 9 F08 -1.66 SG22 117 83 TWD 18 F06 0.13 SG22 117 83 TWD 6 F05 -0.42 SG22 117 83 TWD 5 F08 0.09 SG22 117 91 TWD 15 F07 1.33 SG22 119 81 TWD 14 F06 -0.61 SG22 120 82 TWD 6 F08 1.24 Page 27

A AR EVA Document No.: 51-9156712-000 AREVA NP Inc.,

an AREVA and Siemens company Calvert Cliffs Unit 2 -- U2R19 180-Day Report SG22 120 I 88 -TWD_ 9 F08__-1.27 SG2.2 121 75 TWD _1_1_F06 -0.79 SG22 -123 77 -TWD 6 F06_ -0.61 SG22 123 81 TWD 11 F07 1.53 SG22 123 83 TWD 25 F07 0.33 SG22 123 83 -TWD- 8 F06 0.59 SG22 123 83 TWD 6 F05 0.28 SG22 124 76 TWD _ 8 F06 0.76 SG22_ 124 82 TWD 13 F06 -1.29

_SG22 124 82 __TWD 9 F08 -1.37 SG22 124 82 TWDO 7 F09 _ -1.4

-SG22 J-125 91- -TWD -- 9-9 F03 -.. 1-.95 SG22 1..26 82 TWD ----15 F07 1.16 S7G2-2 F-127 83 TWD - 13 F07 0.22 SG22 128 92 TWD ... 7 F08 - -1.25 SG22 130 92 TWD 10 F06 1.78 SG22 131 75 TWD 9 F06 -1.29 SG22 131- 83T-"WD 8 1 F08 0 SG22j 135_[ 83_LtrWDL_ 81 :F07 _ 0.18]

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