ML13008A088

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Inservice Inspection Summary Report, Form NIS-1 Owner'S Report for Inservice Inspections, Part 4 of 7-05
ML13008A088
Person / Time
Site: Byron Constellation icon.png
Issue date: 01/03/2013
From:
Exelon Generation Co, Exelon Nuclear
To:
Office of Nuclear Reactor Regulation
References
Download: ML13008A088 (47)
v • d • e


Text

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS -1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 1 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Auxiliary Feedwater System (AF)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1AF02DA- Hunter Corp. N/A N/A N/A 4/1 AF06046G 1AF02EB- HUNTER GRINNELL N/A N/A 4/1 AF04077R 1 FW87BA- HUNTER N/A N/A N/A 3/1 FW 14001 R Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 2 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Containment Spray System (CS)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-CS-2-1 Hunter Corp. N/A N/A N/A 1-CS-2-2 Hunter Corp. N/A N/A N/A 1-CS-2-3 Hunter Corp. N/A N/A N/A 1-CS-2-4 Hunter Corp. N/A N/A N/A 1-CS-2-5 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 3 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Chemical & Volume Control System (CV)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-CV-2-1 Hunter Corp. N/A N/A N/A 1-CV-2-10 Hunter Corp. N/A N/A N/A 1-CV-2-2 Hunter Corp. N/A N/A N/A 1-CV-2-3 Hunter Corp. N/A N/A N/A 1-CV-2-4 Hunter Corp. N/A N/A N/A 1-CV-2-5 Hunter Corp. N/A N/A N/A 1-CV-2-6 Hunter Corp. N/A N/A N/A 1-CV-2-7 Hunter Corp. N/A N/A N/A 1-CV-2-8 Hunter Corp. N/A N/A N/A 1-CV-2-9 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 4 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Chemical & Volume Control System (CV)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 CV-01-PA/L1 HUNTER N/A N/A N/A 1 CV-01-PA/L2 HUNTER N/A N/A N/A 1 CV-01-PA/L3 HUNTER N/A N/A N/A 1 CV-01-PA/L4 HUNTER N/A N/A N/A 1 CV05CB- Hunter Corp. N/A NA NA 6/1 CV08005X 1CV08BA- Hunter Corp. N/A NA NA 4/1 CV01004X 1 CVA3B-2/1 CV25035X HUNTER N/A N/A N/A 1 CVA5AA- Hunter Corp. N/A NA NA 2/1 CV1 5022X 1 CVA7AA- HUNTER N/A N/A N/A 2/1 CV25017X 1 CVB7A- Hunter Corp. N/A N/A N/A 3/1 CV06009C Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 5 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Chemical & Volume Control System (CV)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1CVA3AA-2/W-06 Hunter Corp. 1-CV-1-N5 NA NA 1 CVA3AA-2/W-07 Hunter Corp. 1-CV-1-N5 NA NA 1CVA3B-2/W-74 Hunter Corp. 1-CV-1-N5 NA NA 1 CVA3B-2/W-75 Hunter Corp. 1-CV-1-N5 NA NA 1CVA3B-2/W-76 Hunter Corp. 1-CV-1-N5 NA NA 1CVA3B-2/W-77 Hunter Corp. 1-CV-1-N5 NA NA 1 CVA3B-2/W-84 Hunter Corp. 1-CV-1-N5 NA NA 1 CVA3B-2/W-85 Hunter Corp. 1-CV-1-N5 NA NA 1 CVA5AA-2/W-04 Hunter Corp. 1-CV-1-N5 NA NA 1CVA5AA-2/W-05 Hunter Corp. 1-CV-1-N5 NA NA 1 CVA6AA-2/W-04 Hunter Corp. 1 -CV-1 -N5 NA NA 1 CVA6AA-2/W-05 Hunter Corp. 1-CV-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 6 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Chemical & Volume Control System (CV)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1CVA7AA-2/W-08 Hunter Corp. 1-CV-1-N5 NA NA 1 CVA7AA-2/W-09 Hunter Corp. 1-CV-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 1S1 Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 7 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Chemical & Volume Control System (CV)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 CVO5CB- Pacific Scientific 20451 NA NA 6/1 CV08021 S 1 CV1 5AD- Pacific Scientific 12447 NA NA 3/4/1 CV30002S 1 CVA3B-2/1 CV09050S Pacific Scientific 16676 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 8 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Fuel Pool Cooling System (FC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-FC-2-1 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 22 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 9 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Feedwater System (FW)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-FW-2-1 Hunter Corp. N/A N/A N/A 1-FW-2-2 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 10 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Feedwater System (FW)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1FW03DB-16/CO1 Hunter Corp. 1-FW-1-N5 NA NA 1 FW03DB-1 6/C02 Hunter Corp. 1-FW-1-N5 NA NA 1 FW87CB-6/CO7A W. A. Pope Corp. N/A NA NA 1 FW87CB-6/CO8A W. A. Pope Corp. N/A NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 11 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Main Steam System (MS)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 MS07BA- Pacific Scientific 8051 NA NA 28/1 MS01074-S1 1 MS07BA- Pacific Scientific 6413 NA NA 28/1 MS01074-S2 Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B 1 R 18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 12 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Main Steam System (MS)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-MS-2-1 Hunter Corp. N/A N/A N/A 1-MS-2-2 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 13 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Main Steam System (MS)

Manufacturer Component or Manufacturer State or National Appurtenance or Installer or Installer Province No. Board No.

Serial No.

1 MS07AA- Hunter Corp. N/A NA NA 28/1 MS01205X Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 1SI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 14 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Off Gas System (OG)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-OG-2-1 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 II Byron Station Unit 1 B1R18 1St Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 15 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Process Sampling System (PS)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-PS-2-3 Hunter Corp. N/A N/A N/A 1-PS-2-4 Hunter Corp. N/A N/A N/A 1-PS-2-5 Hunter Corp. N/A N/A N/A 1-PS-2-6 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 16 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC8002B/NBW 1-24 Hunter Corp. 1-RC-1-N5 NA NA 1

1 RC8002B/STUDS 1- Hunter Corp. 1-RC-1-N5 NA NA 1

24 Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/312013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 17 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-RC-1-1 Hunter Corp. N/A N/A N/A 1-RC-2-1 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 1

Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 18 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RC-01-PC/L1 Hunter Corp. N/A N/A N/A 1 RC-01-PC/L3 Hunter Corp. N/A N/A N/A 1 RC21AA- Hunter Corp. N/A NA NA 8/1 RC01004V 1 RC24AA- Hunter Corp. N/A NA NA 4/1 RY06017X Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 19 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RC04AA-12/J02 Hunter Corp. 1-RC-1-N5 NA NA 1 RC04AA-12/J03 Hunter Corp. 1-RC-1-N5 NA NA 1 RC04AA-12/J04 Hunter Corp. 1-RC-1-N5 NA NA 1 RC04AA-12/J05 Hunter Corp. 1-RC-1-N5 NA NA 1 RC04AB-12/J02 Hunter Corp. 1-RC-1-N5 NA NA 1RC04AB-12/J03 Hunter Corp. 1-RC-1-N5 NA NA 1 RC04AB-12/J04 Hunter Corp. 1-RC-1-N5 NA NA 1 RC04AB-12/J05 Hunter Corp. 1-RC-1-N5 NA NA 1 RC05AB-6/J02 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC05AB-6/J03 Hunter Corp. 1-RC-1-N5 NA NA 1 RC05AB-6/J04 Hunter Corp. 1-RC-1-N5 NA NA 1 RC05AB-6/J05 Hunter Corp. 1 -RC-1 -N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 20 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC13AA-2/W-01 Hunter Corp. 1-RC-1-N5 NA NA 1 RC13AA-2/W-02.01 W. A. Pope Corp. N/A NA NA 1 RC13AA-2/W-03 Hunter Corp. 1-RC-1-N5 NA NA 1RC13AA-2/W-04 Hunter Corp. 1-RC-1-N5 NA NA 1 RC13AA-2/W-05 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 3AB-2/W-01 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC13AB-2/W-09 Hunter Corp. 1-RC-1-N5 NA NA 1RC13AC-2/W-01 Hunter Corp. 1-RC-1-N5 NA NA 1RC13AD-2/W-01 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AA-21W-02 Hunter Corp. 1-RC-1-N5 NA NA 1RC14AA-2/W-03 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AA-2/W-03A Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B 1 R 18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 21 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC14AA-2/W-03B Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 4AA-2/W-03C Hunter Corp. 1 -RC-1 -N5 NA NA 1RC14AA-2/W-04 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AA-2/W-05 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AA-2/W-06 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AA-2/W-07 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 4AA-2/W-08 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC14AA-2/W-09 Hunter Corp. 1-RC-1-N5 NA NA 1RC14AA-2/W-10 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 4AA-2/W-1 1 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 4AA-2/W-1 2 Hunter Corp. 1-RC-1-N5 NA NA 1RC14AA-2/W-13 Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 22 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC14AB-2/W-07 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AB-2/W-08 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AB-2/W-09 Hunter Corp. 1-RC-1-N5 NA NA 1RC14AB-2/W-10 Hunter Corp. 1-RC-1-N5 NA NA 1RC14AB-2/W-11 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 4AC-2/W-08 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC1 4AD-2/W-08 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AD-2/W-09 Hunter Corp. 1-RC-1-N5 NA NA 1 RC14AD-2/W-10 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 4AD-2/W- 11 Hunter Corp. 1-RC-1-N5 NA NA 1RC14AD-2/W-12 Hunter Corp. 1-RC-1-N5 NA NA 1RC14AD-2/W-13 Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 23 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC16AA-2/W-02 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 6AA-2/W-03 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 6AA-2/W-04 Hunter Corp. 1-RC-1-N5 NA NA 1 RC1 6AA-2/W-05 Hunter Corp. 1-RC-1-N5 NA NA 1 RC16AA-2/W-06 Hunter Corp. 1-RC-1-N5 NA NA 1 RC16AA-2/W-07 Hunter Corp. 1-RC-1-N5 NA NA 1RC16AA-2/W-08 Hunter Corp. 1-RC-1-N5 NA NA 1 RC16AB-2/W-02 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-01 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-02 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1 .5/W-03 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-04 Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 24 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RC22AA-1.5/W-05 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-06 Hunter Corp. 1-RC-1-N5 NA NA 1RC22AA-1.5/W-07 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-08 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-09 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-10 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.51(-11.01 NPSW Venture Corp. N/A NA NA 1 RC22AA-1.5/W-12.01 NPSW Venture Corp. N/A NA NA 1RC22AA-1.5/W-13.02 NPSW Venture Corp. N/A NA NA 1 RC22AA-1.5/W-14.02 NPSW Venture Corp. N/A NA NA 1 RC22AA-1.511-15.02 NPSW Venture Corp. N/A NA NA 1 RC22AA-1.5/W-16.02 NPSW Venture Corp. N/A NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 25 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RC22AA-1.5/W-17.01 NPSW Venture Corp. N/A NA NA 1 RC22AA-1.5/W-1 8 Hunter Corp. 1-RC-1-N5 NA NA 1RC22AA-1.5/W-19 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-20 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC22AA-1.5/W-21 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-22 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-23 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC22AA-1.5/W-24 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC22AA-1.5/W-25 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC22AA-1.5/W-26 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-27 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC22AA-1.5/W-28 Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1R18 IS1 Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 26 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC22AA-1.51W-29 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1 .5/W-30 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-31 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RC22AA-1.5/W-32 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AA-1.5/W-33 Hunter Corp. 1-RC-1-N5 NA NA 1 RC22AC-1.5/W-16.01 Shaw Corp. N/A NA NA 1

1 RC22AC-1.51W-17.01 Shaw Corp. N/A NA NA 1

1 RC22AC-1.5/W-18.01 Shaw Corp. N/A NA NA 1 RC28A-3/Zone 1 Hunter Corp. 1-RC-1-N5 NA NA 1 RC35AA-6/J02 Hunter Corp. 1-RC-1-N5 NA NA 1 RC35AA-6/J03 Hunter Corp. 1-RC-1-N5 NA NA 1 RC35AA-6/J04 Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 27 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No .

Serial No.

1 RC35AA-6/J05 Hunter Corp. 1-RC-1-N5 NA NA 1 RC37A-3/Zone 2 Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/312013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME code Rules (Page 28 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RC01 BA-1 A/1 RC06S Paul Munroe PD-1423-333 NA NA 1 RC01 BA-1 A/1 RC07S Paul Munroe PD-1423-322 NA NA 1 RC01 BB-1 B/1 RC08S Paul Munroe PD-1423-329 NA NA 1 RC01 BB-1 B/1 RC09S Paul Munroe PD-1423-327 NA NA 1 RC01 BC-1 C/1 RC10S Paul Munroe PD-1423-334 NA NA 1 RC01 BC-1 C/1 RC11 S Paul Munroe PD-1423-331 NA NA 1 RC01 BD-1 D/1 RC12S Paul Munroe PD-1423-321 NA NA 1 RC01 BD-1 D/1 RC13S Paul Munroe PD-1423-318 NA NA 1 RC08AC- Pacific Scientific 14772 NA NA 3/4/1 RC18020S 1RC14AB- Pacific Scientific 5842 NA NA 2/1 CV15014S 1RC14AB- Lisega 30400002-03 NA NA 2/1 CV15041-S1 1 RC1 4AB- Lisega 30400002-04 NA NA 2/1 CV1 5041 -S2 Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 29 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RC)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC14AD- Pacific Scientific 14802 NA NA 2/1 CV25001 S 1 RC20AD- Lisega 03615873-019 NA NA 3/4/1 RC1 9024S 1 RC22AB- Pacific Scientific 20437 NA NA 1.5/1 RC17015S 1 RC24AA- Pacific Scientific 7400 NA NA 4/1 RY06055S Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 30 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Residual Heat Removal System (RH)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-RH-2-1 Hunter Corp. N/A N/A N/A 1-RH-2-2 Hunter Corp. N/A N/A N/A 1-RH-2-3 Hunter Corp. N/A N/A N/A 1-RH-2-4 Hunter Corp. N/A N/A N/A 1-RH-2-5 Hunter Corp. N/A N/A N/A 1-RH-2-6 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 31 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Residual Heat Removal System (RH)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RI-101 AA- Hunter Corp. N/A NA NA 12/1 RH02065X Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/312013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 32 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Pressure Vessel (RPV)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RC-01-R/RPV BMI Westinghouse Corp. 640-0004-51 B-09061 N-198 1RC-01-R/RPV HEAD Westinghouse Corp. 640-0004-52 B-09061 N-198 PEN J-WELD 1 RC-01 -R/RPV HEAD Westinghouse Corp. 640-0004-52 B-09061 N-198 PEN SURFACE Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/312013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 33 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RY)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1RY03BA-6/FLG 1-12 Hunter Corp. 1-RY-1-N5 NA NA 1 RY03BB-6/FLG 1-12 Hunter Corp. 1-RY-1-N5 NA NA 1

Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 34 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RY)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RY18A-2/W-05A.01 NPSW Venture Corp. N/A NA NA 1 RY1 8A-2/W-06.01 NPSW Venture Corp. N/A NA NA 1RY18A-2/W-07 Hunter Corp. 1-RC-1-N5 NA NA 1 RY18A-2/W-08 Hunter Corp. 1-RC-1-N5 NA NA 1 RY1 8A-2/W-09 Hunter Corp. 1 -RC-1 -N5 NA NA 1 RY18A-2/W-10 Hunter Corp. 1-RC-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 I Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 35 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Reactor Coolant System (RY)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RY01 B-6/1 RY06076S Pacific Scientific 10881 NA NA 1 RY01 B-6/1 RY06118- Pacific Scientific 18448 NA NA S1 1 RY01 B-6/1 RY06118- Pacific Scientific 9801 NA NA S2 1 RY02B-3/1 RY09077S Pacific Scientific 14793 NA NA 1 RY06A-3/1 RY09101 S Pacific Scientific 8214 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 36 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Steam Generator (SG)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RC-01-BA/N-1-NIR Babcock & Wilcox Industries 7722-02 ILU-242904 165 1 RC-01-BA/N-2-NIR Babcock & Wilcox Industries 7722-02 ILU-242904 165 1 RC-01 -BA/SGW-08 Babcock & Wilcox Industries 7722-02 ILU-242904 165 1 RC-01-BD/N-1-NIR Babcock & Wilcox Industries 7722-04 ILU-242901 167 1RC-01-BD/N-2-NIR Babcock & Wilcox Industries 7722-04 ILU-242901 167 Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 37 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Safety Injection System (SI)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-SI-2-1 Hunter Corp. N/A N/A N/A 1-SI-2-2 Hunter Corp. N/A N/A N/A 1-SI-2-3 Hunter Corp. N/A N/A N/A 1-SI-2-5 Hunter Corp. N/A N/A N/A 1-SI-2-6 Hunter Corp. N/A N/A N/A 1-SI-2-7 Hunter Corp. N/A N/A N/A 1-SI-2-8 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 38 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Safety Injection System (SI)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 RH01 SA/1 SI06A001 X Hunter Corp. N/A NA NA 1 RH01 SA/1 S106A002R Hunter Corp. N/A NA NA 1SI02BA-6/1SI15002X Hunter Corp. N/A NA NA 1 SI02BB-6/1 SI18062X HUNTER N/A N/A N/A 1S104B- Hunter Corp. N/A NA NA 12/1 RH02100X 1 S104D-8/1 RH02021 X HUNTER N/A N/A N/A 1 S104D-8/1 RH02023X Hunter Corp. N/A NA NA 1 SI05AA-8/1 S118082X Hunter Corp. N/A NA NA 1SI05CA-8/15102002V Hunter Corp. N/A NA NA 1SI05CA-8/151030080 Hunter Corp. N/A NA NA 1SI05DA-6/1SI01030X Hunter Corp. N/A NA NA 1SIO6BB- Hunter Corp. N/A NA NA 24/1 S10615OX Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 39 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Safety Injection System (SI)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 SI08FA-3/1 S121018X Hunter Corp. N/A NA NA 1SI08FA-3/1SI23001X Hunter Corp. N/A NA NA 1 SI08GB HUNTER N/A N/A N/A 1/2/1 S 125026X 1 SI08GB HUNTER N/A N/A N/A 1/2/1 S 125027X 1 SI08GB HUNTER N/A N/A N/A 1/2/1 S 125028X 1 SI08JA HUNTER N/A N/A N/A 1/2/1 S 125025X 1 SIA4A-8/1 RH02106X Hunter Corp. N/A NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 40 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Safety Injection System (SI)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 SI08B-4/C03.01 Shaw Corp. N/A NA NA 1SI08B-4/C04.01 Shaw Corp. N/A NA NA 1

1 S108CA-4/C01 A Shaw Corp. N/A NA NA 1

1 SI08CA-4/C01 B Shaw Corp. N/A NA NA 1

1 S108CA-4/C01 C Shaw Corp. N/A NA NA 1

1 S108CA-4/C01 D Shaw Corp. N/A NA NA 1

1 S108CA-4/C02.01 Shaw Corp. N/A NA NA 1

1 SI08CA-4/C03.01 Shaw Corp. N/A NA NA 1 SI08CB-4/COA Shaw Corp. N/A NA NA 1

1SIO8CB-4/COB Shaw Corp. N/A NA NA 1

1SIO8CB-4/COC Shaw Corp. N/A NA NA 1

1SI08CB-4/COD Shaw Corp. N/A NA NA 1

Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 41 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Safety Injection System (SI)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 SI08CB-4/COE Shaw Corp. N/A NA NA 1

1SI08GC-1.5/W-01 Hunter Corp. 1-SI-1-N5 NA NA 1SI08GC-1.5/W-02 Hunter Corp. 1-SI-1-N5 NA NA 1SI08GC-1.5/W-03 Hunter Corp. 1-SI-1-N5 NA NA 1SI08GC-1.5/W-04 Hunter Corp. 1-SI-1-N5 NA NA 1SI08GC-1.5/W-05 Hunter Corp. 1-SI-1-N5 NA NA 1S108HA-2/W-01 Hunter Corp. 1-SI-1-N5 NA NA 1SI08HA-2/W-02 Hunter Corp. 1-SI-1-N5 NA NA 1SI08HA-2/W-03 Hunter Corp. 1-SI-1-N5 NA NA 1SI08HA-2/W-04 Hunter Corp. 1-SI-1-N5 NA NA 1S108JA-1.5/W-06 Hunter Corp. 1-SI-1-N5 NA NA 1S108JA-1.5/W-07 Hunter Corp. 1-SI-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 42 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Safety Injection System (SI)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1SI08JA-1.5,W-08 Hunter Corp. 1-SI-1-N5 NA NA 1SI08JA-1.5/W-09 Hunter Corp. 1-SI-1-N5 NA NA 1SI08JA-1.5/W-10 Hunter Corp. 1-SI-1-N5 NA NA 1 S108JA-1.5/W-1 1 Hunter Corp. 1-SI-1-N5 NA NA 1SI08JA-1.5/W-12 Hunter Corp. 1-SI-1-N5 NA NA 1SI08JA-1.5/W-13 Hunter Corp. 1-SI-1-N5 NA NA 1SI08JA-1.5/W-14 Hunter Corp. 1-SI-1-N5 NA NA 1SI08JA-1.5/W-15 Hunter Corp. 1-SI-1-N5 NA NA 1SI08JB-1.5/W-27.01 Shaw Corp. N/A NA NA 1

1SI09BA-10/J09 Hunter Corp. 1-SI-1-N5 NA NA 1SI09BA-10/J11 Hunter Corp. 1-SI-1-N5 NA NA Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in, x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 43 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Safety Injection System (SI)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 SI09BA- Pacific Scientific 8816 NA NA 10/1 SI01004S Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 44 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Essential Service Water System (SX)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1-SX-2-1 Hunter Corp. N/A N/A N/A 1-SX-2-2 Hunter Corp. N/A N/A N/A Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 45 of 46)

1. Owner: Exelon Generation Company,(EGC,LLC), 4300 Winfield Road, Warrenville, Illinois 60555 (Name and Address of Owner)
2. Plant: Byron Nuclear Power Station, 4450 North German Church Road, Byron, Illinois 61010 (Name and Address of Plant)
3. Plant Unit: 1 4. Owner Certificate Of Authorization (if required): N/A
5. Commercial Service Date: 09/16/85 6. National Board Number for Unit: N-198
7. Components Inspected: Essential Service Water System (SX)

Manufacturer Component or Manufacturer State or National or Installer Appurtenance or Installer Province No. Board No.

Serial No.

1 SX06BB-16/1 PC-7A HUNTER N/A N/A N/A 1 SX07FA-16/1 PC-14A Hunter Corp. N/A NA NA 1SX08AD- Hunter Corp. N/A NA NA 10/1 SX07013A 1 SX08BA- HUNTER N/A N/A N/A 10/1 SX06032X Note (1): Baseline Examination Note (2): Snubber examined as a Component Support Note: Supplemental sheets in form of lists, sketches, or drawings may be used, provided (1) size is 8 1/2 in. x 11 in., (2) information in items 1 through 6 of this report is included on each sheet, and (3) each sheet is numbered and the number of sheets is recorded at the top of this form.

Computer Generated Form

1/3/2013 Byron Station Unit 1 B1 R18 ISI Outage Report FORM NIS-1 OWNER'S REPORT FOR INSERVICE INSPECTIONS As Required by the Provisions of the ASME Code Rules (Page 46 of 46)

(BACK)

8. Examination Dates: 04/24/2011 to 10/08/2012
9. Inspection Period Identification: Second Inspection Period
10. Inspection Interval Identification: Third Inspection Interval
11. Applicable Edition of Section XI: 2001 Addenda 2003
12. Date 1 Revision of Inspection Plan: 06/10/2012 / 7
13. Abstract of Examinations and Test. Include a list of examinations and tests and a statement concerning status of work required for the Inspection Plan.

Refer to the Outage Summary Report and ISI Program Plan

14. Abstract of Results of Examinations and Tests.

Refer to the Outage Summary Report

15. Abstract of Corrective Measures.

Refer to the Outage Summary Report We certify that a) the statements made in this report are correct, b) the examinations and tests meet the Inspection Plan as required by the ASME Code,Section XI, and c) corrective measures taken conform to the rules of the ASME Code,Section XI.

Certificate of Authorization No. (if applicable): N/A Expiration Date: N/A Signed for:Exelon Generation Company CERTIFICATE OF INSERVICE INSPECTION I, the undersigned, holding a valid commission issued by the National Board of Boiler and Pressure Vessel Inspectors and the State or Province of Illinois and employed by HSB CT of Hartford CT. have inspected the components described in this Owner's Report during the period 04/24/2011 to 10/08/2012 , and state that to the best of my knowledge and belief, the Owner has performed examinations and tests and taken corrective measures described in this Owner's Report in accordance with the requirements of the ASME Code,Section XI.

By signing this certificate neither the Inspector nor his employer makes any warranty, expressed or implied, concerning the examinations, tests, and corrective measures described in this Owner's Report. Furthermore, neither the Inspector nor his employer shall be liable in any manner for any personal injury or property damage or a loss of any kind arising from or connected with this inspection.

Commissions: s a Date: , 20 National Board, State, Province, and Endorsements Computer Generated Form

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