RC-02-0161, Application of the EPRI Risk-Informed ISI Methodology to: VC Summer (Class 1 and 2), Risk Ranking Results - Table 5-2

Application of the EPRI Risk-Informed ISI Methodology to: VC Summer (Class 1 and 2), Risk Ranking Results - Table 5-2

ML022670393
Person / Time
Site:	Summer
Issue date:	09/16/2002
From:	South Carolina Electric & Gas Co
To:	Office of Nuclear Reactor Regulation
References
-nr, RC-02-0161
Download: ML022670393 (60)

Text

Risk Ranking Results C, C C Consequence Evaluation VC Summer .ConditionalCore Melt Potential Risk Ranking, Matrix E

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C C VC Summer Risk Ranking Report, Rev. 1 (08126/2002)

C Risk Characterization Consequence Failure Potential Lines In Weld I System Semn Segment Category akRn Rank ID Rank DMs IRank ak SgetWelds in Segment jCutSketch on No(s). C Hemn O1RC RC-034 2 High RCS37 High TASCS, TT Medium 14"DE-RC-01 1-4500A-3, 1-4500A-4, 1-4500A-5, 1-4500A-6, 12 CGE-1-4100A 1 1-450A-7, 1-4500A-8, 1-4500A-9, 1-4500A-10, CGE-1-4500A 1-4500A-11, 1-4500A-12, 1-4500A-13, 1-4100A.

19BC 01RC RC-052 2 High RCS60 High TASCS, TT Medium 4"SE-RC-05 1-4504-28, 1-4504-29, 1-4504-30 3 CGE-1-4504 1 O1RC RC-054 2 High RCS60 High TASCS, TT Medium 4"SE-RC-05 1-4503-37, 1-4503-38, 1-4503-39, 1-4503-40, 1- 8 CGE-1-4503 1 4503-41, 1-4503-42, 1-4503-43, 1-4503-44 01RC RC-033 2 High RCS37 High TT, PWSCC Medium 14"DE-RC-01 1-4500A-1(DM), 1-4500A-2 2 CGE-1-4500A 1 O1RC RC-055 2 High RCS60 High TT. PWSCC Medium 4"SE-RC-05 1-4503-45, 1-4503-46(DM) 2 CGE-1-4503 I 0IRC RC-028 2 High RCS35A High TASCS Medium 2"DE-RC-08 1-4308-4, 1-4308-5 2 CGE-1-4308 I O1RC RC-001 2 High CVCS02 High TT Medium 3"SE-CS-89 1-4100A-26BC 1 CGE-1-4100A 1 O1RC RC-002 2 High CVCS04 High TI Medium 3"SE-CS-89 1-4200A-22BC 1 CGE-1-4200A 1 O1RC RC-029 2 High RCS35A High TT Medium 2"DE-RC-08 1-4308-6, 1-4308-7 2 CGE-1-4308 1 O1RC RC-030 2 High RCS35A High TT Medium 2"DE-RC-08 1-4308-8. 1-4308-9 2 CGE-1-4308 1 01RC RC-043 2 High RCS54 High TT Medium 6"SE-RC-10 1-4502-13 9 CGE-1-4502 I 6"SE-RC-10 1-4502-16, 1-4502-17, 1-4502-20, 1-4502-21, 1- CGE-1-4505A 4502-22,1-4502-23 3*SE-RC-10 1-4505A-10, 1-4505A-9 01RC RC-044 2 High RCS54 High TT Medium 6"SE-RC-10 1-4502-19, 1-4502-18 6 CGE-1-4502 1 3"SE-RC-10 1-4505A-11. 1-4505A-12. 1-4505A-13, 1-4505A CGE-1-4505A 14 01RC RC-045 2 High RCS54 High TT Medium 6"SE-RC-10 1-4502-15, 1-4502-14 4 CGE-1-4502 I 3"SE-RC-10 1-4505A-3. 1-4505A-4 CGE-1-4505A 01RC RC-046 2 High RCS55 High TT Medium 3"SE-RC-10 1-4505A-5, 1-4505A-6, 1-4505A-7, 1-4505A-8 4 CGE-1-4505A I O1RC RC-047 2 High RCS56 High TT Medium 3"SE-RC-10 1-4505A-1, 1-4505A-2 2 CGE-1-4505A 1 O1RC RC-048 2 High RCS57 High TT Medium 3"SE-RC-10 1-4505A-15, 1-4505A-16 2 CGE-1-4505A 1 O1RC RC-064 2 High SIRH-A2 High TT Medium 6"SE-SI-23 1-4100A-24BC 1 CGE-1-4100A 1 O1RC RC-065 2 High SIRH-B2 High TT Medium 6"SE-SI-22 1-4200A-23BC 1 CGE-1-4200A 1 O1RC RC-066 2 High SiRH-C2 High TT Medium 6"SE-SI-21 1-4300A-24BC 1 CGE-1-4300A I O1RC RC-003 2 High RCSl1 High PWSCC Medium 29"RCA 1-4100A-33(DM), 1-4100A-34(DM), 1-4100A-35 3 CGE-1-4100A I 01RC RC-005 2 High RCS11 High PWSCC Medium 29"RCA 1-4100A-31(DM) 1 CGE-1-4100A I O1RC RC-011 2 High RCS21 High PWSCC Medium 29"RCB 1-4200A-1(DM), 1-4200A-2 2 CGE-1-4200A 1 O1RC RC-013 2 High RCS21 High PWSCC Medium 29"RCB 1-4200A-28(DM) 1 CGE-1-4200A 1 O1RC RC-021 2 High RCS31 High PWSCC Medium 29"RCC 1-4300A-1(DM), 1-4300A-2 2 CGE-1-4300A I 01RC RC-023 2 High RCS31 High PWSCC Medium 29"RCC 1-4300A-29(DM) I CGE-1-4300A I 01RC RC-035 2 High RCS51 High PWSCC Medium 6"SE-RC-09 1-4501-1(DM), 1-4501-2 2 CGE-1-4501 1 O1RC RC-037 2 High RCS52 High PWSCC Medium 6"SE-RC-09 1-4501-12(DM), 1-4501-13 2 CGE-1-4501 1 01RC RC-039 2 High RCS53 High PWSCC Medium 6"SE-RC-09 1-4501-23(DM), 1-4501-24 2 CGE-1-4501 1 O1RC RC-041 2 High RCS54 High PWSCC Medium 6"SE-RC-10 1-4502-1(DM), 1-4502-2 2 CGE-1-4502 1 02RHR RHR-032 2 High RHRA1 High TASCS Medium 12"SE-RC-04 1-4102A-5, 1-4102A-6, 1-4102A-7 3 CGE-1-4102A 1 02RHR RHR-034 2 High RHRA3 High TASCS Medium 3"SE-RC-04 1-4102A-26BC 1 CGE-1-4102A I I of 20

C CI VC Summer Risk Ranking Report, Rev. 1 (0812612002)

C Risk Characterization Consequence Failure Potential Lines in Weld Segment Category Rank ID Rank DMs Rank Segment Count Sketch No(s). CC 02RHR RHR-035 2 High RHRA4 High TASCS Medium 2"SE-RC-04 1-4102A-27SW 1 CGE-1-4102A 1 03SI SI-101 2 High SIRH-A2 High TASCS,TT Medium 6"SE-SI-23 1-4103A-12, 1-4103A-13, 1-4103A-14 3 CGE-1-4103A 1 03SI Si-111 2 High SIRH-B2 High TASCS, TT Medium 6"SE-SI-22 1-4202A-15, 1-4202A-16 2 CGE-1-4202A T 03SI SI-122 2 High SIRH-C2 High TASCS,"IT Medium 6"SE-SI-21 1-4303-15, 1-4303-16 2 CGE-1-4303 1 03SI 51-034 2 High RHRC1 High TASCS Medium 12"SE-RC-04 1-4302-6, 1-4302-7, 1-4302-8, 1-4302-9, 1- 5 CGE-1-4302 1 4302-10 1 03SI St-036 2 High RHRC3 High TASCS Medium 3"SE-RC-04 1-4302-25BC 1 CGE-1-4302 T 03SI SI-037 2 High RHRC4 High TASCS Medium 2"SE-RC-04 1-4302-26 1 CGE-1-4302 T 03SI SI-083 2 High SIHL-A3 High TASCS Medium 6"SE-SI-19 1-4104A-18, 1-4104A-19 2 CGE-1-4104A T 03SI SI-090 2 High SIHL-B3 High TASCS Medium 6"SE-SI-20 1-4203A-9, 1-4203A-10 2 CGE-14203A T 03SI SI-097 2 High SIHL-C3 High TASCS Medium 6"SE-SI-24 1-4304-4, 1-4304-3 2 CGE-14304 T 03SI SI-102 2 High SIRH-A2 High TT Medium 6"SE-SI-23 1-4103A-15, 1-4103A-16 2 CGE-1-4103A T 03SI Sl-112 2 High SIRH-B2 High TT Medium 6"SE-SI-22 1-4202A-17, 1-4202A-18, 1-4202A-19, 1-4202A 4 CGE-14202A T 20 03SI S1-123 2 High SIRH-C2 High TT Medium 6"SE-SI-21 14303-17. 1-4303-18 2 CGE-1-4303 1 04CS CS-003 2 High CVCS02 High TASCS, TT Medium 3"SE-CS-89 1-4106A-7. 1-4106A-8 2 CGE-1-4106A T 04CS CS-007 2 High CVCS04 High TASCS, TT Medium 3"SE-CS-89 1-4205A-7, 1-4205A-8 2 CGE-1-4205A T 040S CS-010 2 High CVCS06 High TASCS, r Medium 2"DE-CS-82 1-4506A-53, 1-4506A-54, 1-4506A-55BC 3 CGE-1-4506A T 04CS CS-004 2 High CVCS02 High TT Medium 3"SE-CS-89 1-4106A-9, 1-4106A-10 2 CGE-1-4106A T 04CS CS-008 2 High CVCS04 High TT Medium 3"SE-CS-89 1-4205A-9, 1-4205A-10. 1-4205A-11, 1-4205A- 4 CGE-1-4205A T 12 04CS CS-012 2 High RCS15A High TT Medium 3"SE-CS-92 1-4107A-8, 1-4107A-9, 1-4107A-10, 1-4107A- 11 CGE-1-4107A 1 11, 1-4107A-12, 1-4107A-14, 1-4107A-15. 1 4107A-16, 1-4107A-17, 1-4107A-18, 1-4107A 19 04CS CS-013 2 High RCS15A High TT Medium 3"SE-CS-92 1-4107A-13 1 CGE-1-4107A 1 08EF EF-002 2 High FW-C-04A High TT Medium 6"SA-904 2-2104A-6 1 CGE-2-2104A 2 08EF EF-004 2 High FW-C-04B High TT Medium 6"SA-106 2-2204A-6 1 CGE-2-2204A 2 08EF EF-006 2 High FW-C-04C High TT Medium 6"-106-904 2-2304-6 1 CGE-2-2304 2 01RC RC-004 4 Medium RCSl1 High None Low 29"RCA 1-4100A-36, 1-4100A-3. 1-4100A-29 3 CGE-1-4100A 1 01RC RC-006 4 Medium RCS12 High None Low 31"RCA 1-4100A-32(DM), 1-4100A-30, 1-4100A-8. 1- 7 CGE-1-4100A 1 4100A-9, 1-4100A-10, 1-4100A-11, 1-4100A-12 O1RC RC-007 4 Medium RCS13 High None Low 27.5"RCA 1-4100A-13, 1-4100A-14, 14100A-15, 1-4100A 4 CGE-1-4100A I

_________16(DMI _________

O1RC RC-008 4 Medium RCS14 High None Low 3"Capped 1-4100A-20BC, 1-4100A-27 2 CGE-1-4100A 1 01RC RC-009 4 Medium RCS15A High None Low 3"SE-CS-92 1-4100A-21BC 1 CGE-1-4100A T 01RC RC-010 4 Medium RCS16 High None Low 2"Capped 14100A-22BC, 1-4100A-28 2 CGE-1-4100A I 01RC RC-012 4 Medium RCS21 High None Low 29"RCB 1-4200A-3, 1-4200A-26 2 CGE-1-4200A 1 OIRC RC-014 4 Medium RCS22 High None Low 31"RCB 1-4200A-27, 1-4200A-29(DM), 1-4200A-8, 1- 7 CGE-1-4200A T 4200A-9, 1-4200A-10, 14200A-11, 1-4200A-12 01RC RC-015 4 Medium RCS23 High None Low 27.5"RCB 1-4200A-13, 1-4200A-14, 1-420A-15, 1-4200A- 4 CGE-1-4200A 1 16(DM)

O1RC RC-016 4 Medium RCS24 High None Low 3"Capped 1-4200A-18BC, 1-4200A-25 2 CGE-1-4200A 1 2 of 20

C. C C VC Summer Risk Ranking Report, Rev. 1 (08/2612002)

Segment JCategory Risk Characterization Rank ID Consequence Rank Failure Potential DMs Rank e inWelds I Segment Weld Count _

J Segment [Countr SketchI O1RC RC-017 4 Medium RCS25A High None Low 2"DE-RC-10 1-4200A-19BC, 1-4208A-1, 1-4208A-2, 1- 5 CGE-1-4200A, 1 4208A-3, 1-4208A-4 CGE-1-4208A 01RC RC-020 4 Medium RCS26 High None Low 2"Capped 1-4200A-20BC, 1-4200A 2 CGE-1-4200A 1 01RC RC-022 4 Medium RCS31 High None Low 29"RCC 1-4300A-3, 1-4300A-27 2 CGE-1-4300A I 01RC RC-024 4 Medium RCS32 High None Low 31"RCC 1-4300A-30(DM), 1-4300A-28, 1-4300A-8, 1- 7 CGE-1-4300A I 4300A-9, 1.4300A-10. 1.4300A-11, 1-4300A-12 O1RC RC-025 4 Medium RCS33 High None Low 27.5"RCC 1-4300A-13, 1-4300A-14, 1-4300A-15, 1-4300A 4 CGE-1-4300A 1 16(DM)

O1RC RC-026 4 Medium RCS34 High None Low 3"Capped 1-4300A-19BC, 1.4300A-25 2 CGE-1-4300A 1 O1RC RC-027 4 Medium RCS35A High None Low 2"DE-RC-08 1-4300A-20BC, 1-4308-1, 1-4308-2, 1-4308-3 4 CGE-1-4300A 1 CGE-1-4308 01RC RC-032 4 Medium RCS36 High None Low 2"Capped 1-4300A-22BC, 1-4300A-26 2 CGE-1-4300A I 01RC RC-036 4 Medium RCS51 High None Low 6"SE-RC-09 1-4501-3, 1-4501-4, 1-4501-5, 1-4501-6, 1- 9 CGE-1-4501 1 4501-7, 1-4501-8, 1-4501-9, 1-4501-10, 1-4501 11 O1RC RC-038 4 Medium RCS52 High None Low 6"SE-RC-09 1-4501-14, 1-4501-15, 1-4501-16, 1-4501-17, 1- CGE-1-4501 T 4501-18, 1-4501-19. 1-4501-20, 1-4501-21, 1 4501-22 O1RC RC-040 4 Medium RCS53 High None Low 6"SE-RC-09 1-4501-25, 1-4501-26, 1-4501-27, 1-4501-28, 1 9 CGE-1-4501 1 4501-29, 1-4501-30, 1-4501-31, 1-4501-32, 1 4501-33 O1RC RC-042 4 Medium RCS54 High None Low 6"SE-RC-10 1-4502-3, 1-4502-4, 1-4502-5, 1-4502-6, 1- 10 CGE-1-4502 I 4502-7, 1-4502-8, 1-4502-9, 1-4502-10, 1-4502

11. 1-4502-12 01RC RC-049 4 Medium RCS58 High None Low 4"SE-RC-05 1-4100A-23BC 25 CGE-1-4100A T 4"SE-RC-05 1-4504-1, 1-4504-2, 1-4504-3, 1-4504-4, 1- CGE-1-4504 4504-5, 1-4504-6, 1-4504-7, 1-4504-8, 1-4504 9, 1-4504-10, 1-4504-11, 1-4504-12. 1-4504-13, 1-4504-14, 1-4504-15, 1-4504-16, 1-4504-17, 1 4504-18, 1-4504-19, 1-4504-20, 1-4504-21, 1 4504-22, 1-4504-23, 1-4504-24 O1RC RC-050 4 Medium RCS59 High None Low 4"SE-RC-05 1-4300A-21BC 33 CGE-1-4300A 1 4"SE-RC-06 1-4503-1, 1-4503-2, 1-4503-3, 1-4503-4, 1- CGE-1-4503 4503-5, 1-4503-6, 1-4503-7, 1-4503-8, 1-4503 9, 1-4503-10, 1-4503-11, 1-4503-12, 1-4503-13, 1-4503-14, 1-4503-15, 1-4503-16, 1-4503-17, 1 4503-18, 1-4503-19, 1-4503-20, 1-4503-21, 1 4503-22, 1-4503-23, 1-4503-24, 1-4503-25, 1 4503-26, 1-4503-27, 1-4503-28, 1-4503-29, 1 4503-30, 1-4503-31, 1-4503-32 01RC RC-051 4 Medium RCS60 High None Low 4"SE-RC-05 1-4504-25, 1-4504-26,1-4504-27 3 CGE-1-4504 1 O1RC RC-053 4 Medium RCS60 High None Low 4"SE-RC-05 1-4503-33, 1-4503-34, 1-4503-35, 1-4503-36 4 CGE-1-4503 1 O1RC RC-056 4 Medium RHRA1 High None Low 12"SE-RC-04 1-4100A-18BC 1 CGE-1-4100A 1 3 of 20

C (

VC Summer Risk Ranking Report, Rev. 1 (08/2612002)

(

Risk Characterization Segment Catgoy an ID Consequence Rank Failure Potential DMs I Rank Linesi ISegment Wid Segment Weld Count S

EC 01RC RC-057 4 Medium RHRC1 High None Low 12"SE-RC-04 1-4300A-18BC I CGE-1-4300A 1 O1RC RC-058 4 Medium SIAC-A2 High None Low 12"SE-SI-13 1-4100A-25BC 1 CGE-1-4100A I 01RC RC-059 4 Medium SIAC-B2 High None Low 12"SE-SI-14 1-4200A-21BC 1 CGE-1-4200A 1 01RC RC-060 4 Medium SIAC-C2 High None Low 12"SE-SI-15 1-4300A-23BC 1 CGE-1-4300A 1 01RC RC-061 4 Medium SIHL-A3 High None Low 6"SE-SI-19 1-4100A-17BC 1 CGE-1-4100A T 01RC RC-062 4 Medium SIHL-B3 High None Low 6"SE-SI-20 1-4200A-17BC 1 CGE-1-4200A 1 01RC RC-063 4 Medium SIHL-C3 High None Low 6"SE-SI-24 1-4300A-17BC 1 CGE-1-4300A 1 02RHR RHR-031 4 Medium RHRA1 High None Low 12"SE-RC-04 1-4102A-1, 1-4102A-2, 1-4102A-3 3 CGE-1-4102A 1 02RHR RHR-021 4 Medium RHR-C-04A2 High None Low 10"SE-RH-04 2-2521B-23, 2-2521B-24, 2-2521B-25, 2-2521B 14 CGE-2-2521B 2 26, 2-2521B-27, 2-2521B-28, 2-2521B-29, 2 2521B-30, 2-2521B-31, 2-2521 B-32, 2-2521B 33: 2-2521B-34, 2-2521B-35 10"SE-RH-05 2-2521B-36 02RHR RHR-026 4 Medium RHR-C-04B2 High None Low 10"SE-RH-05 2-2523A-16, 2-2523A-17, 2-2523A-18, 2-2523A 7 CGE-2-2523A 2

19. 2-2523A-20, 2-2523A-21, 2-2523A-22 02RHR RHR-027 4 Medium RHR-C-05A High None Low 10"SE-RH-05 2-2521B-37, 2-2521B-38, 2-2521A-39, 2-2521A 15 CGE-2-2521A 2

40. 2-2521A-41, 2-2521A-42, 2-2521A-43, 2- CGE-2-2521B 2521A-44, 2-2521A-45, 2-2521A-46, 2-2521A 47, 2-2521A-48, 2-2521A-49, 2-2521A-50, 2

___2521A-51 02RHR RHR-028 4 Medium RHR-C-05B High None Low 10"SE-RH-05 2-2523A-23. 2-2523A-24 2 CGE-2-2523A 2 02RHR RHR-029 4 Medium RHR-C-06B High None Low 10"SE-RH-05 2-2523A-133, 2-2523A-25, 2-2523A-26. 2- 11 CGE-2-2523A 2 2523A-1 11. 2-2523A.27, 2-2523A-28, 2-2523A 29, 2-2523A-30, 2-2523A-31, 2-2523A-1 12, 2 2523A-32 02RHR RHR-030 4 Medium RHR-C-07B High None Low 10SE-RH-05 2-2523A-91 1 CGE-2-2523A 2 03SI SI-033 4 Medium RHRC1 High None Low 12"SE-RC-04 1-4302-1, 1-4302-2, 1-4302-3, 1-4302-4, 1- 5 CGE-1-4302 1 4302-5 03SI SI-072 4 Medium SIAC-A2 High None Low 12"SE-SI-13 1-4101A-16, 1-4101A-17, 1-4101A-18, 1-4101A 5 CGE-1-4101A 1

_ 19, 1-4101A-20 03SI SI-075 4 Medium SIAC-82 High None Low 12"SE-Si-14 1-4201A-8, 1-4201A-9, 1-4201A-10, 1-4201A- 6 CGE-1-4201A 1 11, 1-4201A-12, 1-4201A-13 03SI SI-078 4 Medium SIAC-C2 High None Low 12"SE-SI-15 1-4301-9, 1-4301-10, 1-4301-11, 1-4301-12, 1- 5 CGE-1-4301 1 4301-13 03SI SI-084 4 Medium SIHL-A3 High None Low 6"SE-SI-19 1-4104A-20, !-4!04A-2!' 2 CGE-1-4104A 1 03SI SI-091 4 Medium SIHL-B3 High None Low 6"SE-SI-20 1-4203A-11, 1-4203A-12 2 CGE-1-4203A 1 03SI SI-098 4 Medium SIHL-C3 High None Low 6"SE-SI-24 1-4304-2, 1-4304.1 2 CGE-1-4304 I 03SI Si-100 4 Medium SIRH-A2 High None Low 6'SE-SI-23 1-4103A-11 1 CGEo1-4103A 1 03SI Si-001 4 Medium IL-C-01 High None Low 3"TI 2-3006-8, 2-3006-9, 2-3006-10, 2-3006-11, 2- 9 CGE-2-3006 2 3006-12, 2-3006-13, 2-3006-14, 2-3006-15, 2

_3006-16 03SI SI-002 4 Medium IL-C-01 High None Low 3"SI-X 2-3006-19, 2-3006-20 2 CGE-2-3006 2 4 of 20

C C VC Summer Risk Ranking Report, Rev. 1 (08126/2002)

Risk Characterization Consequence Failure Potential Lines In WWeed System q enIs. Welds In Segment SketC cc Segment Category Rank in Rank DMs Rank Segment un 03SI SI-003 4 Medium IL-C-02 High None Low 3"SI 2-3005-1, 2-3005-2, 2-3005-3, 2-3005-4, 2- 12 CGE-2-3005 2 3005-5, 2-3005-6. 2-3005-7, 2-3005-8 2"SI 2-3005-12, 2-3005-13, 2-3005-14, 2-3005-15 03SI SI-004 4 Medium IL-C-02 High None Low 3"SI 2-3005-9, 2-3005-10, 2-3005-11 12 CGE-2-3005 2 3"SI 2-3007-1 CGE-2-3007 2"SI 2-3007-2, 2-3007-3, 2-3007-4. 2-3007-5, 2 3007-6, 2-3007-7, 2-3007-8, 2-3007-9 03SI SI-005 4 Medium IL-C-02 High None Low 2"SI 2-3007-14 1 CGE-2-3007 2 03SI SI-006 4 Medium IL-C-02 High None Low 2*SI 2-3004-1, 2-3004-2, 2-3004-3, 2-3004-4, 2- 6 CGE-2-3004 2 3004-5, 2-3004-6 03SI SI-010 4 Medium IL-C-03A High None Low 10"SE-SI-02 2-2521A-14, 2-2521A-13, 2-2521A-12, 2-2521A 6 CGE-2-2521A 2 11, 2-2521A-10, 2-2521A.9 03SI SI-011 4 Medium IL-C-03B High None Low 10"SE-SI-02 2-2525-5, 2-2525-6, 2-2525-7, 2-2525-8, 2- 7 CGE-2-2525 2 2525-9. 2-2525-10, 2-2525-11 03SI SI-012 4 Medium IL-C-04A High None Low 10"SE-SI-02 2-2521A-7 2-2521A-6 2 CGE-2-2521A 2 03SI SI-013 4 Medium IL-C-04B High None Low 10"SE-SI-16 2-2525-3, 2-2525-4 2 CGE-2-2525 2 03SI SI-014 4 Medium IL-C-05 High None Low 10"SE-SI-02 2-2521A-5 11 CGE-2-2521A 2 10*SE-SI-17 2-2521A-2, 2-2521A-1 CGE-2-2541 6"SE-SI-17 2-2541-8, 2-2541-7, 2-2541-6, 2-2541-5, 2 2541-4, 2-2541-3, 2-2541-2. 2-2541-1 03SI SI-015 4 Medium IL-C-05 High None Low 10"SE-SI-17 2-2521A-4, 2-2521A-3 19 CGE-2-2521A 2 6"SE-SI-17 2-2541-9, 2-2541-10, 2-2541-11, 2-2541-12.2- CGE-2-2541 2541-13, 2-2541-14, 2-2541-15, 2-2541-16, 2 2541-17, 2-2541-18, 2-2541-19, 2-2541-24, 2 2541-20, 2-2541-21. 2-2541-25, 2-2541-22, 2 2541-23 03SI SI-016 4 Medium IL-C-05 High None Low 10"SE-SI-16 2-2525-2 15 CGE-2-2525 2 10"SE-SI-16 2-2526-14, 2-2526-15, 2-2526-16, 2-2526-17 CGE-2-2526 6"SE-SI-16 2-2526-18, 2-2526-26, 2-2526-27, 2-2526-19, 2.

2526-20, 2-2526-21, 2-2526-22, 2-2526-23, 2 2526-24, 2-2526-25 03SI SI-017 4 Medium IL-C-05 High None Low 6"SE-SI-16 2-2526-13,2-2526-12, 2-2526-11, 2-2526-28,2- 14 CGE-2-2526 2 2526-10, 2-2526-9, 2-2526-8, 2-2526-7, 2-2526 6, 2-2526-5, 2-2526-4. 2-2526-3. 2-2526-2, 2 2526-1 03SI SI-024 4 Medium RHR-C-01A3 High None Low 14"SE-SI-04 2-2500-60, 2-2500-69, 2-2500-59 3 CGE-2-2500 2 03SI SI-027 4 Medium RHR-C-O1B3 High None Low 14"SE-SI-05 2-2501-55, 2-2501-61, 2-2501-54, 2-2501-53, 2- 5 CGE-2-2501 2 2501-52 03St SI-028 4 Medium RHR-C-07A High None Low 10"SE-RH-05 2-2521A-52, 2-2521A-53, 2-2521A-54, 2-2521A. 16 CGE-2-2521A 2 55, 2-2521A-56, 2-2521A-57, 2-2521A-58, 2 2521A-59 10"SE-SI-02 2-2521A-22, 2-2521A-21, 2-2521A-20, 2-2521A.

19. 2-2521A-18, 2-2521A-17, 2-2521A-16, 2

_2521A-15 5 of 20

C VC Summer Risk Ranking Report, Rev. 1 (08/26/2002)

° Syste Risk Characterization Consequence Failure Potential Lin I WeldslIn Segment IktcWeld S Nos cc I Segment Category Rank ID Rank DMs Rank I Count C 0351 51-029 4 Medium RHR-C-07B High None Low 10"SE-SI-02 2-2525-31, 2-2523A-33, 2-2525-30. 2-2523A- 29 CGE-2-2523A 2 34, 2-2525-29, 2-2523B-35, 2-2525-28, 2- CGE-2-2523B 2523B-36, 2-2525-27, 2-2523B-37, 2-2523B-38, CGE-2-2525 2-2525-26, 2-2525-25, 2-2523B-39, 2-2525-24, 2-2525-23, 2-2525-39, 2-2525-22, 2-2525-38, 2 2525-21, 2-2525-20, 2-2525-19, 2-2525-18, 2 2525-17, 2-2525-16, 2-2525-15, 2-2525-14, 2 2525-13, 2-2525-12 0351 S1-030 4 Medium RHR-C-07C High None Low 10"SE-RH-05 2-2521A-61, 2-2521A-62, 2-2521A-63 3 CGE-2-2521A 2 0351 SI-031 4 Medium RHR-C-07C High None Low 10"SE-SI-02 2-2523B-40, 2-2523B-41 11 CGE-2-2523B 2 10*SE-SI-03 2-2,523B-42, 2-2523B-43, 2-2523B-44, 2-2523B 45, 2-2523B-46, 2-2523B-47, 2-2523B-48, 2 2523B-49, 2-2523B-50 0351 SI-032 4 Medium RHR-C-07C High None Low 8"SE-SI-02 2-25232-89, 2-2523B-90 2 CGE-2-2523B 2 04CS CS-011 4 Medium RCS15A High None Low 3"SE-CS-92 1-4107A-1, 1-4107A-2, 1-4107A-3, 1-4107A-4, 7 CGE-1-4107A 1 1-4107A-5, 1-4107A-6, 1-4107A-7 04CS CS-015 4 Medium RCS15C High None Low 2"SE-CS-92 1-4110A-1, 1-4110A-2, 1-4110A-3, 1-4110A-4 4 CGE-1-4110A 1 05SP SP-010 4 Medium SP-C-01A2 High None Low 12"SP-151R 2-3000-20, 2-3000-21, 2-3000-22, 2-3000-23 4 CGE-2-3000 2 05SP SP-013 4 Medium SP-C-01B2 High None Low 12"SP-151R 2-3001-30, 2-3001-29, 2-3001-27 3 CGE-2-3001 2 08EF EF-001 4 Medium FW-C-04A High None Low 6"SA-904 2-2104A-8, 2-2104A-7 2 CGE-2-2104A 2 08EF EF-003 4 Medium FW-C-04B High None Low 6"SA-106 2-2204A-8, 2-2204A-7 2 CGE-2-2204A 2 08EF EF-005 4 Medium FW-C-04C High None Low 6"-106-904 2-2304-7 1 CGE-2-2304 2 02RHR RHR-018 5a Medium RHR-C-04A1 Medium TASCS Medium 10"SE-RH-04 2-2522A-13, 2-2522A-14, 2-2522A-44 3 CGE-2-2522A 2 02RHR RHR-023 5a Medium RHR-C-04B1 Medium TASCS Medium 10"SE-RH-05 2-2523A-13, 2-2523A-14, 2-2523A-15 3 CGE-2-2523A 2 0351 SI-110 5a Medium SIRH-B1 Medium TT, IGSCC Medium 6"SE-SI-22 1-4202A- 4 1 CGE-1-4202A 1 03S1 SI-117 5a Medium SIRH-BSI2 Medium 1T, IGSCC Medium 2"SE-SI-33 1-4209A-23 2 CGE-1-4209A 1 2"SE-SI-22 1-4209A-24BC 0351 S1-121 5a Medium SIRH-C1 Medium TT, IGSCC Medium 6"SE-SI-21 1-4303-14 1 CGE-1-4303 1 0351 S1-104 5a Medium SIRH-ASI1 Medium TT Medium 2"DE-SI-14 1-4112A-11 2 CGE-1-4112A 1 2"SE-SI-23 1-4112A-12BC 0351 S1-106 5a Medium SIRH-ASI2 Medium TT Medium 2"SE-SI-27 1-4111A-39 2 CGE-1-4111A 2"SE-SI-23 1-41101A-4BC 0351 SI-114 5a Medium SIRH-BSI1 Medium TT Medium 2"DE-SI-47 1-4210A-9 2 CGE-1-4210A 1

_2"SE-SI-22 1-4210A-IOBC 03S1 SI-125 5a Medium SIRH-CSI1 Medium TT Medium 2"DE-SI-17 1-4310-7 2 CGE-1-4310 I 2"SE-SI-21 1-4310-8BC 03S1 SI-128 5a Medium SIRH-CS12 Medium TT Medium 2"SE-SI-30 1-4309-25 2 CGE-1-4309 1 2"SE-SI-21 1-4309-26BC 0351 SI-071 5a Medium SIAC-Al Medium IGSCC Medium 12"SE-SI-13 1-4101A-14, 1-4101A-15 2 CGE-1-4101A 1 0351 SI-074 5a Medium SIAC-B1 Medium IGSCC Medium 12"SE-SI-14 1-4201A-6, 1-4201A-7 2 CGE-1-4201A I 03S1 SI-077 5a Medium SIAC-C1 Medium IGSCC Medium 12"SE-SI-15 1-4301-7, 1-4301-8 2 CGE-1-4301 1 0351 SI-080 5a Medium SIHL-A1 Medium IGSCC Medium 6"SE-SI-19 1-4104A-14, 1-4104A-15, 1-4104A-16, 1-4104A 4 CGE-1-4104A 1 17 0351 SI-086 5a Medium SIHL-B1 Medium IGSCC Medium 6"SE-SI-20 1-4203A-8 1 CGE-1-4203A 6 of 20

C ( C VC Summer Risk Ranking Report, Rev. 1 (08/26/2002)

System S [

Risk Characterization CategorRSegment Iemn Category Rankj Consequence ID RakI Failure Potential Rank Lines in Wolds in Segment WeldC Count E

03SI SI-093 5a Medium SIHL-C1 Medium IGSCC Medium 6"SE-SI-24 1-4304-6, 1-4304-5 2 CGE-1-4304 I 03SI SI-109 5a Medium SIRH-B1 Medium IGSCC Medium 6"SE-SI-22 1-4202A-13 1 CGE-1-4202A 1 03SI SI-116 5a Medium SIRH-BS12 Medium IGSCC Medium 2"SE-SI-33 1-4209A-22 1 CGE-1-4209A I 03SI S1-120 5a Medium SIRH-C1 Medium IGSCC Medium 6"SE-SI-21 1-4303-13 1 CGE-1-4303 1 O4CS CS-002 5a Medium CVCSO1 Medium TT Medium 3"SE-CS-89 1-4106A-6 1 CGE-1-4106A 1 04CS CS-006 5a Medium CVCS03 Medium TT Medium 3"SE-CS-89 1-4205A-6 1 CGE-1-4205A 1 04CS CS-014 5a Medium RCS15B Medium TT Medium 3"SE-CS-92 1-4107A-20, 1-4107A-21 2 CGE-1-4107A I O7FW FW-018 5a Medium FW-C-03A Medium TASCS Medium 18"SA-106 2-2102A-25 3 CGE-2-2102A 2 16"P22 2-2102A-24, 2-2102A-23 07FW FW-022 5a Medium FW-C-03B Medium TASCS Medium 183-P22 2-2202-21 2 CGE-2-2202 2 16"-P11 2-2202-20 07FW FW-028 5a Medium FW-C-03C Medium TASCS Medium 18"SE-FW-14 2-2302-33 2 CGE-2-2302 2 16"SE-FW-14 2-2302-32 O1RC RC-018 6a Low RCS25B Medium None Low 2"DE-RC-10 1-4208A-5, 1-4208A-6, 1-4208A-8, 1-4208A-9 4 CGE-1-4208A T OIRC RC-019 6a Low RCS25B Medium None Low 2"DE-RC-10 1-4208A-7 1 CGE-1-4208A 1 01RC RC-031 6a Low RCS35B Medium None Low 2"DE-RC-08 1-4308-10, 1-4308-11 2 CGE-1-4308 I 02RHR RHR-033 6a Low RHRA2 Medium None Low 12"SE-RH-09 1-4102A-8, 1-4102A-9, 1-4102A-10, 1-4102A- 16 CGE-1-4102A I

11. 14102A-12, 1-4102A-13, 1-4102A-14, 1 4102A-15, 1-4102A-16, 1-4102A-17, 1-4102A 18, 1-4102A-19, 1-4102A-20, 1-4102A-21, 1 4102A-22. 1-4102A-23 02RHR RHR-036 6a Low RHRA5 Medium None Low 3"SE-RH-09 1-4102A-24BC 1 CGE-1-4102A 1 02RHR RHR-037 6a Low RHRA6 Medium None Low 2"SE-RC-09 1-4102A-25SW 1 CGE-1-4102A 1 02RHR RHR-001 6a Low RHR-C-01A2 Medium None Low 14"SE-RH-04 2-2500-45, 2-2500-44, 2-2500-43 3 CGE-2-2500 2 02RHR RHR-002 6a Low RHR-C-01A4 Medium None Low 12"SE-RH-10/06 2-2500-1, 2-2500-2, 2-2500-3, 2-2500-4, 2- 13 CGE-2-2500 2 2500-5, 2-2500-6, 2-2500-7, 2-2500-8, 2-2500 9, 2-2500-10, 2-2500-11.2-2500-13.2-2500-14 02RHR RHR-003 6a Low RHR-C-O1A5 Medium None Low 12"SE-RH-10/06 2-2500-15, 2-2500-16, 2-2500-17, 2-2500-18, 2- 8 CGE-2-2500 2 2500-19, 2-2500-20, 2-2500-21, 2-2500-22 O2RHR RHR-004 6a Low RHR-C-01A6 Medium None Low 12"SE-RH-10/06 2-2500-23, 2-2500-24, 2-2500-25, 2-2500-26.2- 7 CGE-2-2500 2 2500-27, 2-2500-28, 2-2500-29 02RHR RHR-005 6a Low RHR-C-01A7 Medium None Low 14"SE-RH-04 2-2500-42, 2-2500-41, 2-2500-40. 2-2500-39, 2- 12 CGE-2-2500 2 2500-38, 2-2500-37, 2-2500-36, 2-2500-35, 2 2500-34, 2-2500-33, 2-2500-32, 2-2500-31 02RHR RHR-006 6a Low RHR-C-01B2 Medium None Low 12"SE-RH-01 2-2501-28, 2-2501-29.2-2501-69,2-2501-30, 2- 12 CGE-2-2501 2 2501-31, 2-2501-70, 2-2501-71, 2-2501-32, 2 2501-33, 2-2501-34 14"SE-RH-01 2-2501-49, 2-2501-48 02RHR RHR-007 6a Low RHR-C-01B2 Medium None Low 14"SE-RH-01 2-2501-47, 2-2501-46, 2-2501-45, 2-2501-44 4 CGE-2-2501 2 7 of 20

C C C VC Summer Risk Ranking Report, Rev. 1 (0812612002)

Risk Characterization Consequence Failure Potential inWelds In Segment Weld Segment Category Rank ID Rank DMs Rank Segment CountSketch 02RHR RHR-008 6a Low RHR-C-01B4 Medium None Low 12"SE-RH-10 2-2501-1, 2-2501-2, 2-2501-3, 2-2501-4, 2- 14 CGE-2-2501 2 2501-5. 2-2501-6.2-2501-7, 2-2501-8,2-2501 9,2-2501-10,2-2501-11,2-2501-12,2-2501-13, 2-2501-14 02RHR RHR-009 6a Low RHR-C-01B5 Medium None Low 12"SE-RH-01 2-2501-15, 2-2501-16, 2-2501-17,2-2501-18,2- 10 CGE-2-2501 2 2501-19, 2-2501-20.2-2501-21,2-2501-22.2 2501-67. 2-2501-68 02RHR RHR-010 6a Low RHR-C-01B6 Medium None Low 12"SE-RH-01 2-2501-24 1 CGE-2-2501 2 02RHR RHR-01 I 6a Low RHR-C-01 B7 Medium None Low 12"SE-RH-01 2-2501-25, 2-2501-26, 2-2501-27 3 CGE-2-2501 2 02RHR RHR-012 6a Low RHR-C-O1B8 Medium None Low 14"SE-RH-01 2-2501-91, 2-2501-43, 2-2501-42. 2-2501-41. 2- 9 CGE-2-2501 2 2501-40, 2-2501-39, 2-2501-38, 2-2501-37,2 2501-36 02RHR RHR-013 6a Low RHR-C-02A Medium None Low 10"RH-601R 2-2520A-1, 2-2520A-63, 2-2520A-2, 2-2520A-3, 16 CGE-2-2520A 2 2-2520A-4, 2-2520A-5, 2-2520A-6, 2-2520A-7, 2-2520A-8, 2-2520A-9, 2-2520A-1 0, 2-2520A 11, 2-2520A-12, 2-2520A-13, 2-2520A-14, 2 2520A-15 02RHR RHR-014 6a Low RHR-C-02B Medium None Low 10"SE-RH-02 2-2524-37, 2-2524-68, 2-2524-36, 2-2524-35, 2- 23 CGE-2-2524 2 2524-34, 2-2524-33, 2-2524-32, 2-2524-31, 2 2524-30, 2-2524-29, 2-2524-27, 2-2524-26, 2 2524-25, 2-2524-24, 2-2524-23, 2-2524-22, 2 2524-21, 2-2524-20, 2-2524-19, 2-2524-18, 2 2524-17, 2-2524-16, 2-2524-69 02RHR RHR-015 6a Low RHR-C-03A2 Medium None Low 10"RH-601R 2-2520A-16, 2-2520A-17, 2-2520A-18, 2-2520A 12 CGE-2-2520A 2 19, 2-2520A-68, 2-2520A-20, 2-2520A-21, 2 2520A-67, 2-2520A-22, 2-2520A-23, 2-2520A 24, 2-2520A-25 02RHR RHR-016 6a Low RHR-C-03B2 Medium None Low 10"SE-RH-02 2-2524-15,2-2524-14,2-2524-13,2-2524-12, 2- 7 CGE-2-2524 2 2524-70, 2-2524-11, 2-2524-10 02RHR RHR-017 6a Low RHR-C-04A1 Medium None Low 1O"RH-601R 2-2520A-26, 2-2520A-27. 2-2520A-28, 2-2520A 25 CGE-2-2520A 2 29, 2-2520A-30, 2-2520A-31, 2-2520A-32, 2- CGE-2-2522A 2520A-66, 2-2520A-33, 2-2520A-34, 2-2520A 35, 2-2520A-62 10"SE-RH-04 2-2522A-47, 2-2522A-48, 2-2522A-2, 2-2522A 3, 2-2522A-4, 2-2522A-5, 2-2522A-6, 2-2522A 7, 2-2522A-8, 2-2522A-9, 2-2522A-10, 2-2522A 11, 2-2522A-12 02RHR RHR-019 6a Low RHR-C-04A1 Medium None Low 8"SE-RH-04 2-2522A-39, 2-2522A-40, 2-2522A-41, 2-2522A 6 CGE-2-2522A 2 49, 2-2522A-42, 2-2522A-43 02RHR RHR-020 6a Low RHR-C-04A1 Medium None Low 8"SE-RH-04 2-2522A-15, 2-2522A-16 2 CGE-2-2522A 2 8 of 20

C ( C VC Summer Risk Ranking Report, Rev. 1 (08/26/2002)

Risk Characterization Consequence Failure Potential Lines in Weld Category Rank ID Rank DMs Rank Segment Count CC Segment 02RHR RHR-022 6a Low RHR-C-04B1 Medium None Low 10"SE-RH-02 2-2524-9 24 CGE-2-2523A 2 10"SE-RH-03 2-2524-8, 2-2524-7, 2-2524-6, 2-2524-5, 2- CGE-2-2524 2524-4, 2-2524-71, 2-2524-3, 2-2524-2. 2-2524 1,2-2524-72 10SE-RH-05 2-2523A- 135, 2-2523A-1, 2-2523A-2, 2-2523A 3, 2-2523A-4, 2-2523A-5, 2-2523A-6. 2-2523A 7, 2-2523A-8. 2-2523A-9, 2-2523A-10, 2-2523A 11, 2-2523A-12 02RHR RHR-024 6a Low RHR-C-04B1 Medium None Low 8"SE-RH-05 2-2523A-83, 2-2523A-84, 2-2523A-85, 2-2523A. 6 CGE-2-2523A 2

86. 2-2523A-87, 2-2523A-88 02RHR RHR-025 6a Low RHR-C-04B1 Medium None Low SE-RH-01 2-2523A-1 36, 2-2523C-51 2 CGE-2-2523A 2 CGE-2-2523C 03SI SI-035 6a Low RHRC2 Medium None Low 12"SE-RH-09 1-4302-11, 1-4302-12, 1-4302-13, 1-4302-14, 1- 14 CGE-1-4302 1 4302-15, 1-4302-16. 1-4302-17, 1-4302-18. 1 4302-19, 1-4302-20, 1-4302-21, 1-4302-22, 1 4302-23, 1-4302-24 03SI SI-038 6a Low RHRC5 Medium None Low 3"SE-RH-09 1-4302-27BC 1 CGE-1-4302 1 03SI SI-039 6a Low RHRC6 Medium None Low 2"SE-RH-09 1-4302-28 1 CGE-1-4302 I 03SI SI-040 6a Low RHRC7 Medium None Low 2"SE-RH-09 1-4302-291C, 1-4302-30 2 CGE-1-4302 1 03SI SI-070 6a Low SIAC-AI Medium None Low 12"SE-SI-13 1-4101A-1, 1-4101A-2. 1-4101A-3, 1-4101A-4, 13 CGE-1-4101A I 1-4101A-5, 1-4101A-6, 1-4101A-7, 1-4101A-8, 1-4101A-9, 1-4101A-10, 1-4101A-11, 1-4101A 12, 1-4101A-13 03SI SI-073 6a Low SIAC-B1 Medium None Low 12"SE-SI-14 1-4201A-1, 1-4201A-2, 1-4201A-3, 1-4201A-4, 5 CGE-1-4201A 1 1-4201A-5 03SI SI-076 6a Low SIAC-C1 Medium None Low 12"SE-SI-15 1-4301-1, 1-4301-2, 1-4301-3, 1.4301-4, 1- 5 CGE-1-4301 1 4301-5 03SI SI-079 6a Low SIHL-A1 Medium None Low 6"SE-Si-19 1-4104A-1, 1-4104A-2, 1-4104A-3, 1-4104A-4, 13 CGE-1-4104A 1 1-4104A-5, 1-4104A-6, 1-4104A-7, 1-4104A-8, 1-4104A-9, 1-4104A-10, 1-4104A-11. 1-4104A 12, 1-4104A-13 03SI SI-081 6a Low SIHL-A2 Medium None Low 2"DE-SI-14 1-4113A-1, 1-4113A-2, 1-4113A-3, 1-4113A-4, 8 CGE-1-4113A 1 1-4113A-5, 1-4113A-6, 1-4113A-8, 1-4113A-9 03SI S1-082 6a Low SIHL-A2 Medium None Low 2"DE-Sl-14 1-4113A-7, 1-4113A-10, 1-4113A-11 4 CGE-1-4113A 1 2"SE-S1-19 1.4113A-12BC 03SI SI-085 6a Low SIHL-B1 Medium None Low 6"SE-SI-20 1-4203A-1. 1-4203A-4, 1-4203A-5. 1-4203A-6. 5 CGE-1-4203A T 1-4203A-7 03SI SI-087 6a Low SIHL-B2 Medium None Low 2"DE-Si-15 1-4211A-1, 1-4211A-2, 1-4211A-4, 1-4211A-5, 11 CGE-1-4211A T 1-4211A-6, 1-4211A-7, 1-4211A-8, 1-4211A-9, 1-4211A-14, 1-4211A-15 2"SE-SI-20 1-4211A-168C 03SI SI-088 6a Low SIHL-B2 Medium None Low 2"DE-Sl-15 1-4211A-3 1 CGE-1-4211A 1 03SI SI-089 6a Low SIHL-82 Medium None Low 2"DE-S1-15 1-4211A-10, 1-4211A-11, 1-4211A-12, 1-4211A 4 CGE-1-4211A 1 13 03SI SI-092 6a Low SIHL-C1 Medium None Low 6"SE-SI-24 1-4304-8, 1-4304-7 2 CGE-1-4304 T 9 of 20

C VC Summer Risk Ranking Report, Rev. 1 (08126/2002)

C Risk Characterization Consequence Failure Potential LinesWelds In Segment Segment Category Rank ID J Rank DMs Rank SegmentCount Weld cc 03SI SI-094 6a Low S1IL-C2 Medium None Low 2"SE-SI-18 1-4311-1, 1-4311-2, 1-4311-5, 1-4311-6 50 CGE-1-4311 2"SE-SI-24 1-4311-8, 1-4311-9, 1-4311-10, 1-4311-11, 1 4311-12, 1-4311-13, 1-4311.14, 1-4311-15, 1 4311-16, 1-4311-17. 1-4311-18, 1-4311-19, 1 4311-20, 1-4311-21, 14311-22. 1-4311-23, 1 4311-24, 1-4311-25, 1-4311-26, 1-4311-27, 1 4311-28, 1-4311-29, 1-4311-30, 1-4311-31, 1 4311-32, 1-4311-33, 1-4311-34, 1-4311-35, 1 4311-36, 1-4311-37, 1-4311-38, 1-4311-39, 1 4311-40,1-4311-41,1-4311-42, 1431143, 1 4311-44, 1-4311-45, 14311-46,1-4311-47, 1 431148,1-4311-49, 1-4311-50, 1-4311-51, 1 4311-52, 1-4311-53 03St SI-095 6a Low SIHL-C2 Medium None Low 2"SE-SI-18 1-4311-4,1-4311-3 2 CGE-1-4311 1 03SI SI-096 6a Low SIHL-C2 Medium None Low 2"SE-S1-18 1-4311-7 1 CGE-1-4311 I 03SI SI-099 6a Low SIRH-A1 Medium None Low 6"SE-SI-23 1-4103A-1, 1-4103A-2, 1-4103A-3, 14103A-4, 10 CGE-1-4103A 1 14103A-5, 1-4103A-6, 1-4103A-7, 1-4103A-8, 1-4103A-9, 1-4103A-10 03SI SI-103 6a Low SIRH-ASI1 Medium None Low 2"DE-SI-14 1-4112A-1, 1-4112A-2, 14112A-3, 1-4112A-4, 10 CGE-1-4112A 1-4112A-5, 14112A-6, 1-4112A-7, 1-4112A-8, 1-4112A-9, 1-4112A-10 03SI SI-105 6a Low SIRH-ASI2 Medium None Low 2"SE-SI-27 1-4111A-1, 1-4111A-2, 1-4111A-4, 1-4111A-5, 37 CGE-14111A 1-4111A-6, 1-4111A-7, 1-4111A-8, 1-4111A-9, 14111A-10, 14111A-11, 1-4111A-12, 1-4111A 13, 1-4111A-14, 1-4111A-15, 1-4111A-16, 1 4111A-17, 1-4111A-18, 1-4111A-19, 1-4111A 20, 1-4111A-21, 1-4111A-22, 1-4111A-23, 1 4111A-24, 1-4111A-25, 1-4111A-26, 1-4111A 27, 14111A-28, 1-4111A-29, 1-4111A-30, 1 4111A-31, 14111A-32, 1-4111A-33, 1-4111A 34, 14111A-35, 1-4111A-36, 1-4111A-37, 1 4111A-38 03SI SI-107 6a Low SIRH-ASI2 Medium None Low 2"SE-SI-27 1-4111A-3 1 CGE-1-4111A 1 03SI S1-108 6a Low SIRH-B1 Medium None Low 6"SE-SI-22 14202A-1, 1-4202A-2, 1-4202A-3, 1-4202A-4, 12 CGE-1-4202A 1 1-4202A-5, 1-4202A-6, 1-4202A-7, 1-4202A-8, 14202A-9, 1-4202A-10, 1-4202A-11, 1-4202A 12 03SI SI-113 6a Low SIRH-BSII Medium None Low 2"DE-SI47 14210A-1, 14210A-2, 1-4210A-3, 14210A-4, 8 CGE-1-4210A I 1-4210A-5, 1421OA-6, 1421OA-7, 1421OA-8 10 of 20

C C VC Summer Risk Ranking Report, Rev. 1 (08/2612002)

Risk Characterization Consequence Failure Potential Lin In Ies Weld Segment Category Rank ID Rank DMs Rank WdISm tkCount o 03SI S1-115 6a Low SIRH-BS12 Medium None Low 2"DE-SI-25 1-42091-1, 1-42090-2 20 CGE-1-4209A 1 2"SE-SI-33 1-4209B-4, 1-4209B.5, 1-4209B-6, 1-4209B-7, CGE-1-4209B 1-4209B-8, 1-42096-9, 1-4209B-10, 1-4209B 11, 1-4209B-12, 1-4209A-13, 1-4209A-14, 1 4209A-15, 1-4209A-16, 1-4209A-17, 1-4209A 18, 1-4209A-19, 1-4209A-20, 1-4209A-21 03SI S1-118 6a Low SIRH-BS12 Medium None Low 2"DE-SI-25/2"SE 1-4209B-3 1 CGE-1-4209B I SI-33 03SI S1-119 6a Low SIRH-C1 Medium None Low 6"SE-SI-21 1-4303-1, 1-4303-2, 1-4303-3, 1-4303-4, 1- 12 CGE-1-4303 1 4303-5, 1-4303-6, 1-4303-7, 1-4303-8, 1-4303 9.1-4303.10, 1-4303-11, 1-4303-12 03SI SI-124 6a Low SIRH-CSI1 Medium None Low 2"DE-SI-17 1-4310-1, 1-4310-2, 1-4310-4, 1-4310-5, 1- 5 - CGE-1-4310 1 4310-6 03SI SI-126 6a Low SIRH-CSI1 Medium None Low 2"DE-SI-17 1-4310-3 1 CGE-1-4310 I 03SI S1-127 6a Low SIRH-CSI2 Medium None Low 2"SE-SI-30 1-4309-1, 1-4309-2, 1-4309-4, 1-4309-5, 1- 23 CGE-1-4309 1 4309-6, 1-4309-7, 1-4309-8, 1-4309-9, 1-4309 10, 1-4309-11, 1-4309-12, 1-4309-13, 1-4309

14. 1-4309-15, 1-4309-16, 1-4309-17, 1-4309 18, 1-4309-19, 1-4309-20, 1-4309-21, 1-4309 22, 1-4309-23, 1-4309-24 03SI SI-129 6a Low SIRH-CSi2 Medium None Low 2"SE-SI-30 1-4309-3 1 CGE-1-4309 I 03SI SI-007 6a Low IL-C-02A Medium None Low 2"Sl 2-3005-16, 2-3005-17, 2-3005-18, 2-3005-19, 2 6 CGE-2-3005 2 3005-20, 2-3005-21 03SI SI-008 6a Low IL-C-02B Medium None Low 2"SI 2-3004-7, 2-3004-8, 2-3004-9, 2-3004-10, 2- 14 CGE-2-3004 2 3004-11, 2-3004-12, 2-3004-13, 2-3004-14, 2 3004-15, 2-3004-16, 2-3004-17, 2-3004-18, 2 3004-19, 2-3004-20 03SI SI-021 6a Low RHR-C-O1A1 Medium None Low 14*SE-SI-04 2-2500-57, 2-2500-58 2 CGE-2-2500 2 03SI SI-022 6a Low RHR-C-01A2 Medium None Low 14"SE-SI-04 2-2500-56, 2-2500-55, 2-2500-54, 2-2500-53, 2 10 CGE-2-2500 2 2500-52, 2-2500-51, 2-2500-49, 2-2500-48, 2 2500-47, 2-2500-46 03SI SI-023 6a Low RHR-C-01A2 Medium None Low 14"SE-SI-04 2-2500-50 1 CGE-2-2500 2 03SI SI-025 6a Low RHR-C-01B1 Medium None Low 14"SE-RH-01 2-2501-60, 2-2501-59 2 CGE-2-2501 2 03SI SI-026 6a Low RHR-C-01B2 Medium None Low 14"SE-SI-05 2-2501-50, 2-2501-51 2 CGE-2-2501 2 03SI SI-041 6a Low RWST-C-01 Medium None Low 20"RH-03 2-3011-1, 2-3011-2, 2-3011-3, 2-3011-4 4 CGE-2-3011 2 03SI SI-042 6a Low RWST-C-02 Medium None Low 20"RH-03 2-3011-5, 2-3011-6, 2-3011-7, 2-3011-8 5 CGE-2-3011 2 8"SP-301 2-3011-BC1 03SI SI-044 6a Low RWST-C-03 Medium None Low 20"RH-03 2-3011-9, 2-3011-10, 2-3011-11, 2-3011-12 6 CGE-2-3011 2 8"CS-22 2-3011-13, 2-3011-14 03SI SI-045 6a Low RWST-C-03 Medium None Low 14"RH-03 2-3011-BC3, 2-3011-15 2 CGE-2-3011 2 03SI SI-046 6a Low RWST-C-03 Medium None Low 12"SP-151 2-3011-BC2 1 CGE-2-3011 2 11 of 20

( C VC Summer Risk Ranking Report, Rev. 1 (08/26/2002)

C Risk Characterization System Consequence Failure Potential Lines In

~Segment W WeCsonuegen [ Count Weld Sketch No(s). CC Segment Category Rank ID Rank DMs I Rank 03SI SI-047 6a Low RWST-C-04 Medium None Low 14"RH-03 2-3011-16, 2-3011-17, 2-3011-18,2-3011-19,2- 5 CGE-2-3011 2 3011-20 03SI SI-048 6a Low RWST-C-05 Medium None Low 14"RH-03 2-3011-21, 2-3011-22, 2-3011-23 3 CGE-2-3011 2 03SI SI-049 6a Low RWST-C-06 Medium None Low 14"RH-03 2-3011-24,2-3011-25,2-3011-26,2-3011-27,2- 11 CGE-2-3011 2 3011-28, 2-3011-29, 2-3011-30, 2-3011-31,2 3011-32, 2-3011-33, 2-3011-34 03St SI-050 6a Low RWST-C-06 Medium None Low 14"RH-03 2-3011-35, 2-3011-36, 2-3011-37, 2-3011-38 4 CGE-2-3011 2 03SI SI-051 6a Low RWST-C-06 Medium None Low 8"RH-08 2-3011-BC4, 2-3011-39, 2-3011-40, 2-3011-41, 8 CGE-2-3011 2 2-3011-42, 2-3011-43, 2-3011-44, 2-3011-45 03SI SI-052 6a Low RWST-C-07 Medium None Low 8"RH-08 2-3011-46, 2-3011-47, 2-3011-48, 2-3011-49, 2 8 CGE-2-3011 2 3011-50, 2-3011-51. 2-3011-52, 2-3011-53 03St SI-053 6a Low SI-C-09A Medium None Low 3"SI 2-3008-1. 2-3008-2, 2-3008-3 3 CGE-2-3008 2 03SI SI-054 6a Low SI-C-09B1 Medium None Low 4"SI 2-3009-1, 2-3009-2, 2-3009-3, 2-3009-4, 2- 13 CGE-2-3009 2 3009-5, 2-3009-6 3"SI 2-3009-7, 2-3009-8, 2-3009-9, 2-3009-10, 2 3009-11, 2-3009-12, 2-3009-13 O3SI SI-055 6a Low SI-C-09B1 Medium None Low 3"SI-2501 2-3014-1, 2-3014-2 2 CGE-2-3014 2 03SI SI-056 6a Low SI-C-11A1 Medium None Low 3"SI 2-3008-4, 2-3008-5 2 CGE-2-3008 2 03SI SI-057 6a Low SI-C-11A2 Medium None Low 3"SI 2-3008-6 14 CGE-2-3008 2 4"SI 2-3008-7, 2-3008-8, 2-3008-9, 2-3008-10 3"SI 2-3008-11, 2-3008-12,2-3008-13,2-3008-14,2 3008-15, 2-3008-16, 2-3008-17, 2-3008-18, 2 3008-19 03SI SI-058 6a Low SI-C-11A3 Medium None Low 3"Sl 2-3008-20, 2-3008-21, 2-3008-22, 2-3008-23, 2- 5 CGE-2-3008 2 3008-24 03SI SI-059 6a Low Si-C-11A3 Medium None Low 3'Sl 2-3008-25, 2-3008-26, 2-3008-27, 2-3008-28, 2- 12 CGE-2-3008 2 3008-29, 2-3008-30, 2-3008-31, 2-3008-32, 2 3008-33, 2-3008-34, 2-3008-35, 2-3008-36 03SI SI-060 6a Low SI-C-11A3 Medium None Low 3"SI 2-3008-37, 2-3008-38, 2-3008-39, 2-3008-40, 2- 8 CGE-2-3008 2 3008-41, 2-3008-42, 2-3008-43, 2-3008-44 03SI SI-061 6a Low SI-C-11A4 Medium None Low 3"Sl 2-3008-45, 2-3008-46, 2-3008-47, 2-3008-48, 2- 13 CGE-2-3008 2 3008-49, 2-3008-50, 2-3008-51, 2-3008-52, 2 3008-53, 2-3008-54, 2-3008-55, 2-3008-56, 2 3008-57 03SI S1-062 6a Low Sl-C-11B1 Medium None Low 3"SI 2-3009-14, 2-3009-15 2 CGE-2-3009 2 03SI SI-063 6a Low Sl-C-11B2 Medium None Low 3"SI 2-3009-16, 2-3009-17, 2-3009-18, 2-3009-19, 2- 7 CGE-2-3009 2 1______ 1__ 13009-20, 2-3009-21, 2-3009-22 1 1 1 12 of 20

( ( (-

VC Summer Risk Ranking Report, Rev. 1 (08/26/2002)

Risk Characterization Consequence Failure Potential Lines in In Segment Weld ID Rank DMs Rank Count Segment Category Rank O3SI SI-064 6a Low SI-C-11 B3 Medium None Low 3"SI 2-3009-23, 2-3009-24, 2-3009-25, 2-3009-26, 2. 19 CGE-2-3009 2 3009-27, 2-3009-28, 2-3009-29, 2-3009-30, 2 3009-31, 2-3009-32, 2-3009-33, 2-3009-34, 2 3009-35, 2-3009-36, 2-3009-37, 2-3009-38, 2 3009-39, 2-3009-40, 2-3009-41 03SI SI-065 6a Low SI-C-11B4 Medium None Low 3"SI 2-3009-42, 2-3009-43, 2-3009-44, 2-3009-45, 2- 15 CGE-2-3006 2 3009-46, 2-3009-47, 2-3009-48, 2-3009-49 CGE-2-3009 3"SI 2-3006-1, 2-3006-2, 2-3006-3, 2-3006-4, 2 3006-5, 2-3006-6, 2-3006-7 03SI SI-066 6a Low SI-C-11B4 Medium None Low 3"Si-X 2-3006-17, 2-3006-18 2 CGE-2-3006 2 O3SI SI-067 6a Low SI-C-12 Medium None Low 3"SI-2501 2-3014-3, 2-3014-4, 2-3014-5, 2-3014-6, 2- 5 CGE-2-3014 2 3014-7 03SI SI-068 6a Low SI-C-13 Medium None Low 3"SI-2501 2-3014-8, 2-3014-9 2 CGE-2-3014 2 03SI SI-069 6a Low S1-C-14 Medium None Low 3"SI-2501 2-3014-10, 2-3014-11,2-3014-12, 2-3014-13, 2- 17 CGE-2-3014 2 3014-14, 2-3014-15, 2-3014-16, 2-3014-17, 2 3014-18,2-3014-19,2-3014-20,2-3014-21,2 3014-22, 2-3014-23, 2-3014-24, 2-3014-25, 2 3014-26 04CS CS-001 6a Low CVCSOl Medium None Low 3"SE-CS-89 1-4106A-1, 1-4106A-2, 1-4106A-3, 1-4106A-4, 5 CGE-1-4106A I 1-4106A-5 04CS CS-005 6a Low CVCS03 Medium None Low 3"SE-CS-89 1-4205A-1, 1-4205A-2, 1-4205A-3, 1-4205A-4, 5 CGE-1-4205A I 1-4205A-5 04CS CS-009 6a Low CVCS05 Medium None Low 2"SE-CS-88 1-4506A-1, 1-4506A-2, 1-4506A-3, 1-4506A-4, 52 CGE-1-4506A I 1-4506A-5, 1-4506A-6, 1-4506A-7, 1-4506A-8, 1-4506A-9, 1-4506A-10, 1-4506A-11, 1-4506A 12, 1-4506A-13, 1-4506A-14, 1-4506A-15, 1 4506A-16, 1-4506A-17, 1-4506A-18, 1-4506A 19, 1-4506A-20, 1-4506A-21, 1-4506A-22, 1 4506A-23, 1-4506A-24, 1-4506A-25, 1-4506A 26, 1-4506A-27, 1-4506A-28, 1.4506A-29, 1 4506A-30, 1-4506A-31, 1-4506A-32, 1-4506A 33, 1-4506A-34, 1-4506A-35, 1-4506A-36, 1 4506A-37, 1-4506A-38, 1-4506A-39, 1-4506A 40, 1-4506A-41, 1-4506A-42, 1-4506A.43, 1 4506A-44, 1-4506A-45, 1-4506A-46, 1-4506A 47, 1-4506A-48, 1-4506A-49, 1-4506A-50, 1 4506A-51, 1-4506A-52 04CS CS-016 6a Low RCS15D Medium None Low 2"SE-CS-92 1-4110A-5, 1-4110A-6 2 CGE-1-4110A 1 04CS CS-017 6a Low RHR-C-04A1 Medium None Low 8"SE-CS-01 2-2522A-17, 2-2522A-18, 2-2522A-19 3 CGE-2-2522A 2 04CS CS-018 6a Low RWST-C-03 Medium None LOw 8"SE-CS-04 2-2540B-90, 2-2540B-91 2 CGE-2-2540B 2 04CS CS-019 6a Low RWST-C-03 Medium None Low 8"SE-CS-04 2-2540B-95, 2-25408-94, 2-2540B-93, 2-2540B 6 CGE-2-2540B 2 92, 2-25401-89, 2-2540B-88 I 13 of 20

C C C VC Summer Risk Ranking Report, Rev. 1 (08126/2002)

Risk Characterization SegmentT Category Syte Rank jSgmntJ Systm ak aegryJ D

1D Consequence Rn Rank [OM DMs [

Failure Potential Rnk Rank Lines In SementCount SemetWelds In Segment Weld CntSketch No(s). 1CC 04CS CS-020 6a Low SI-C-01 Medium None Low 8"SE-CS-04 2-2540B-71. 2-25408-72, 2-25408-73, 2-2540B 9 CGE-2-2540B 2 74, 2-25408-75, 2-2540B-76, 2-25408-77, 2 2540B-78, 2-2540B-97 04CS CS-021 6a Low SI-C-01 Medium None Low 8"SE-CS-04 2-2540B-70, 2-2540B-69, 2-2540B-68, 2-2540B 7 CGE-2-2540B 2 67, 2-2540B-66, 2-2540B-65, 2-2540B-64 04CS CS-022 6a Low SI-C-01 Medium None Low 8"SE-CS-04 2-2540B-44, 2-2540B-45, 2-2540B-46, 2-2540B 10 CGE-2-2540B 2 47, 2-25408-48, 2-2540B-49, 2-2540B-50, 2 2540B-51, 2-2540B-52, 2-2540B-53 04CS CS-023 6a Low SI-C-01 Medium None Low 4"WOL 2-2540B-1BC, 2-2540B-98, 2-25408-99, 2- 4 CGE-2-2540B 2 2540B-100 04CS CS-024 6a Low SI-C-01 Medium None Low 8"SE-CS-01 2-2523C-75, 2-2523C-76, 2-2523C-77, 2- 8 CGE-2-2523C 2 2523C-78, 2-2523C-79, 2-2523C-80, 2-2523C 181, 2-2523C-82 04CS CS-025 6a Low SI-C-02A Medium None Low 8"SE-CS-05 2-2540A-43 1 CGE-2-2540A 2 04CS CS-026 6a Low SI-C-02B Medium None Low 8"SE-CS-04 2-2540B-79 2 CGE-2-2540B 2 8"SE-CS-05 2-25408-80 04CS CS-027 6a Low SI-C-02C Medium None Low 8"SE-CS-04 2-2540B-63, 2-2540B-62, 2-2540B-61 4 CGE-2-2540B 2 8*SE-CS-05 2-25408-60 04CS CS-028 6a Low SI-C-03A Medium None Low 8*SE-CS-05 2-2540A-42, 2-2540A-41, 2-2540A-40, 2-2540A 17 CGE-2-2540A 2 39, 2-2540A-38 6"SE-CS-05 2-2540A-1 2, 2-2540A-1 1, 2-2540A-1 0, 2-2540A 9, 2-2540A-8, 2-2540A-7, 2-2540A-6, 2-2540A 5, 2-2540A-4, 2-2540A-3, 2-2540A-2, 2-2540A 1

04CS CS-029 6a Low SI-C-03B Medium None Low 8"SE-CS-05 2-2540A-81, 2-2540A-82, 2-2540A-83, 2-2540A 21 CGE-2-2540A 2 84, 2-2540A-85, 2-2540A-86, 2-2540A-87 2-2540A-25, 2-2540A-24, 2-2540A-23, 2-2540A 6"SE-CS-04 22, 2-2540A-21, 2-2540A-20, 2-2540A-19, 2 2540A-18, 2-2540A-96, 2-2540A-17, 2-2540A 16, 2-2540A-15, 2-2540A-14, 2-2540A-13 04CS CS-030 6a Low SI-C-03C Medium None Low 8"SE-CS-05 2-2540A-59, 2-2540A-58, 2-2540A-57, 2-2540A 18 CGE-2-2540A 2 56, 2-2540A-55, 2-2540A-54 6"SE-CS-05 2-2540A-37, 2-2540A-36, 2-2540A-35, 2-2540A 34, 2-2540A-33, 2-2540A-32, 2-2540A-31, 2 2540A-30, 2-2540A-29, 2-2540A-28, 2-2540A I 27, 2-2540A-26 04CS CS-031 6a Low SI-C-04A Medium None Low 8"SE-CS-04 2-2922B-36, 2-2522B-37, 2-2522B-38 3 CGE-2-2522B 2 04CS CS-032 6a Low SI-C-04B Medium None Low 8"SE-CS-01 2-2523C-61, 2-2523C-62, 2-2523C-63, 2- 14 CGE-2-2523C 2 2523C-64, 2-2523C-65, 2-2523C-66, 2-2523C 67, 2-2523C-68, 2-2523C-69, 2-2523C-70, 2 2523C-71, 2-2523C-72, 2-2523C-73, 2-2523C 74 ___

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C C C VC Summer Risk Ranking Report, Rev. 1 (0812612002)

Risk1ys1e1 Characterization Consequence Failure Potential inesI Segment Weld SketchnNogs).

Segment Category Rank ID Rank DMs Rank SegmentCountSketch Nos) 04CS CS-033 6a Low SI-C-05A Medium None Low 8"SE-CS-01 2-2522B-65, 2-2522B-30, 2-2522B-31, 2-2522B. 7 CGE-2-2522B 2 32, 2-2522B-33, 2-2522B-34 8"SE-CS-04 2-25228-35 04CS CS-034 6a Low SI-C-05B Medium None Low 8"SE-CS-01 2-2523C-55, 2-2523C-56. 2-2523C-57, 2- 7 CGE-2-2523C 2 2523C-58, 2-2523C-134. 2-2523C-59, 2-2523C 60 04CS CS-035 6a Low SI-C-06A Medium None Low 8"SE-CS-01 2-2522B-20, 2-2522B-21, 2-2522B-22, 2-2522B 11 CGE-2-2522B 2 23, 2-25228-64, 2-2522B-24, 2-2522B-25, 2 2522B-26, 2-25228-27, 2-2522B-28, 2-2522B 29 04CS CS-036 6a Low SI-C-06B Medium None Low 8"SE-CS-01 2-2523C-52, 2-2523C-53. 2-2523C-54 3 CGE-2-2523C 2 04CS CS-037 6a Low SI-C-07A Medium None Low 4"CSA 2-3010-1 5 CGE-2-3010 2 3"CSA 2-3010-2, 2-3010-3, 2-3010-4, 2-3010-5 04CS CS-038 6a Low SI-C-07A Medium None Low 2"CSA 2-3010-1 BC, 2-3010-90, 2-3010-91 3 CGE-2-3010 2 04CS CS-039 6a Low SI-C-07B Medium None Low 4"CSB 2-3010-65 5 CGE-2-3010 2 3"CSB 2-3010-64, 2-3010-63, 2-3010-62, 2-3010-61 04CS CS-040 6a Low SI-C-07B Medium None Low 2"CSB 2-3010-2BC, 2-3010-94, 2-3010-95 3 CGE-2-3010 2 04CS CS-041 6a Low SI-C-07C Medium None Low 4"CSC 2-3010-89 5 CGE-2-3010 2 3"CSC 2-3010-88, 2-3010-87, 2-3010-86, 2-3010-85 04CS CS-042 6a Low SI-C-07C Medium None Low 2"CSC 2-3010-3BC, 2-3010-92, 2-3010-93 3 CGE-2-3010 2 04CS CS-043 6a Low SI-C-08A Medium None Low 3"CSA 2-3010-6, 2-3010-7, 2-3010-8, 2-3010-9, 2- 7 CGE-2-3010 2 3010-10, 2-3010-11, 2-3010-12 04CS CS-044 6a Low SI-C-08B Medium None Low 3"CSB 2-3010-60, 2-3010-59, 2-3010-58, 2-3010-57, 2 7 CGE-2-3010 2 3010-56, 2-3010-55, 2-3010-54 04CS CS-045 6a Low SI-C-08C Medium None Low 3"CSC 2-3010-84, 2-3010-83, 2-3010-82, 2-3010-81,2 6 CGE-2-3010 2 3010-80, 2-3010-79 04CS CS-046 6a Low SI-C-09A Medium None Low 3"CS-15 2-3013-1, 2-3013-2, 2-3013-3, 2-3013-4, 2- 9 CGE-2-3013 2 3013-5, 2-3013-6, 2-3013-7, 2-3013-8, 2-3013 9

04CS CS-047 6a Low SI-C-09A Medium None Low 3"CSA 2-3010-13, 2-3010-14, 2-3010-15, 2-3010-16, 2 6 CGE-2-3010 2 3010-17, 2-3010-18 04CS CS-048 6a Low SI-C-09A Medium None Low 3"CSA 2-3010-19, 2-3010-20, 2-3010-21 3 CGE-2-3010 2 04CS CS-049 6a Low SI-C-09B1 Medium None Low 3*CSB 2-3010-53, 2-3010-52, 2-3010-51, 2-3010-50 7 CGE-2-3010 2 4"CSX 2-3010-49, 2-3010-48, 2-3010-47 04CS CS-050 6a Low SI-C-09B2 Medium None Low 40CSX 2-3010-46, 2-3010-45, 2-3010-44, 2-3010-43 4 CGE-2-3010 2 04CS CS-051 6a Low SI-C-0901 Medium None Low 3"CSC 2-3010-78, 2-3010-77, 2-3010-76, 2-3010-75, 2- 5 CGE-2-3010 2 3010U-74 04CS CS-052 6a Low SI-C-09C2 Medium None Low 3"CSC 2-3010-73,2-3010-72, 2-3010-71, 2-3010-70,2- 5 CGE-2-3010 2 3010-69 04CS CS-053 6a Low SI-C-10A1 Medium None Low 3"CS-15 2-3013-10 1 CGE-2-3013 2 04CS CS-054 6a Low SI-C-10A2 Medium None Low 3"CS-15 2-3013-11, 2-3013-12, 2-3013-13, 2-3013-14, 2- 9 CGE-2-3013 2 3013-15, 2-3013-16, 2-3013-17, 2-3013-18, 2

!3013-19 15 of 20

C C VC Summer Risk Ranking Report, Rev. 1 (08/26/2002)

Risk Characterization Consequence Failure Potential LinesWelds in Segment Sketch No(s). CC Segment Category Rank ID Rank DMs -1 Rank SedCount 04CS CS-055 6a Low SI-C-15 Medium None Low 3"CSA 2-3010-22. 2-3010-23 2 CGE-2-3010 2 O4CS CS-056 6a Low SI-C-16 Medium None Low 3"CSA 2-3010-24. 2-3010-25, 2-3010-26, 2-3010-27, 2- 19 CGE-2-3010 2 3010-28, 2-3010-29, 2-3010-30, 2-3010-31 4"CSX 2-3010-32, 2-3010-33, 2-3010-34, 2-3010-35, 2 3010-36, 2-3010-37, 2-3010-38, 2-3010-39, 2 3010-40, 2-3010-41, 2-3010-42 04CS CS-057 6a Low SI-C-16 Medium None Low 4"CSB 2-3010-66 1 CGE-2-3010 2 04CS CS-058 6a Low SI-C-16 Medium None Low 3"CSC 2-3010-67, 2-3010-68 2 CGE-2-3010 2 04CS CS-059 6a Low SI-C-16 Medium None Low 2"CS-13 2-3010-4BC, 2-3012-1, 2.3012-2, 2-3012-3, 2- 11 CGE-2-3010 2 3012-4, 2-3012-5, 2-3012-6, 2-3012-7, 2-3012- CGE-2-3012 8,2-3012-9,2-3012-10 04CS CS-060 6a Low SI-C-17 Medium None Low 2"CS-13 2-3012-11,2-3012-12, 2-3012-13, 2-3012-14, 2- 9 CGE-2-3012 2 3012-15, 2-3012-16, 2-3012-17, 2-3012-18, 2 3012-19 04CS CS-061 6a Low SI-C-18 Medium None Low 2"CS-13 2-3012-20, 2-3012-21, 2-3012-22, 2-3012-23, 2- 5 CGE-2-3012 2 3012-24 04CS CS-062 6a Low SI-C-18 Medium None Low 2TS-13 2-3012-25, 2-3012-26, 2-3012-27, 2-3012-28, 2- 6 CGE-2-3012 2 3012-29, 2-3012-30 05SP SP-001 6a Low RWST-C-03 Medium None Low 12"SP-151 2-3003-1, 2-3003-2, 2-3003-3, 2-3003-4, 2- 5 CGE-2-3003 2 3003-5 05SP SP-002 6a Low RWST-C-08 Medium None Low 12"SP-151 2-3003-6, 2-3003-7, 2-3003-8, 2-3003-9 4 CGE-2-3003 2 05SP SP-003 6a Low RWST-C-09 Medium None Low 12"SP-151 2-3003-10, 2-3003-11, 2-3003-12, 2-3003-13, 2- 13 CGE-2-3003 2 3003-14, 2-3003-15, 2-3003-16, 2-3003-17. 2 3003-18, 2-3003-19, 2-3003-20, 2-3003-21, 2 3003-22 05SP SP-004 6a Low RWST-C-09 Medium None Low 12"SP-151 2-3003-25, 2-3003-26, 2-3003-27, 2-3003-28, 2- 9 CGE-2-3003 2 3003-29, 2-3003-30, 2-3003-31, 2-3003-32, 2 3003-33 05SP SP-005 6a Low RWST-C-10 Medium None Low 8"SP-301 2-3002-1, 2-3002-2, 2-3002-3, 2-3002-4 4 CGE-2-3002 2 05SP SP-006 6a Low RWST-C-11 Medium None Low 8"SP-301 2-3002-5, 2-3002-6, 2-3002-7, 2-3002-8, 2- 13 CGE-2-3002 2 3002-9, 2-3002-10, 2-3002-11, 2-3002-12, 2 3002-13, 2-3002-14, 2-3002-15, 2-3002-16, 2 3002-17 05SP SP-007 6a Low RWST-C-12 Medium None Low 8"SP-301 2-3002-18, 2-3002-19, 2-3002-20, 2-3002-21, 2- 9 CGE-2-3002 2 3002-22, 2-3002-23, 2-3002-24, 2-3002-25, 2 3002-26 05SP SP-008 6a Low SP-C-O1A Medium None Low 12"SP-151 2-3003-23, 2-3003-24 4 CGE-2-3000 2 12"SP-151R 2-3000-15, 2-3000-14 CGE-2-3003 05SP SP-009 6a Low SP-C-O1A Medium None Low 12"SP-151R 2-3000-19, 2-3000-18, 2-3000-17, 2-3000-16 4 CGE-2-3000 2 05SP SP-011 6a Low SP-C-O1B Medium None Low 12"SP-151 2-3003-34, 2-3003-35 8 CGE-2-3001 2 12"SP-151R 2-3001-21, 2-3001-20, 2-3001-19, 2-3001-18, 2- CGE-2-3003 3001-17, 2-3001-16 05SP SP-012 6a Low SP-C-01B Medium None Low 12"SP-151R 2-3001-26, 2-3001-25, 2-3001-24, 2-3001-23, 2- 7 CGE-2-3001 2 3001-37, 2-3001-22 I_ 12"SP-151R 2-3001-1BC I 16 of 20

C C C VC Summer Risk Ranking Report, Rev. 1 (0812612002)

Risk Characterization Consequence Failure Potential Line in Weld Segment Category Rank ID Rank DMs I Rank SWlInemtCount 05SP SP-014 6a Low SP-C-02A Medium None Low 12"SP-151R 2-3000-13, 2-3000-12. 2-3000-11, 2-3000-10, 2- 13 CGE-2-3000 2 3000-9, 2-3000-8, 2-3000-7, 2-3000-6, 2-3000 5, 2-3000-4, 2-3000-3 10"SP 2-3000-2, 2-3000-1 05SP SP-015 6a Low SP-C-02B Medium None Low 12"SP-151R 2-3001-15, 2-3001-14, 2-3001-13, 2-3001-12, 2 15 CGE-2-3001 2 3001-11, 2-3001-10, 2-3001-9.2-3001-8.2 3001-7, 2-3001-6, 2-3001-5, 2-3001-4, 2-3001 3

10"SP 2-3001-2. 2-3001-1 05SP SP-016 6a Low SP-C-03A Medium None Low 8"SE-SP 2-2553-1, 2-2553-2, 2-2553-3 17 CGE-2-2551A 2 10SE-SP-16 2-2553-4, 2-2553-5, 2-2553-6, 2-2553-7, 2- CGE-2-2553 2553-8, 2-2553-9, 2-2553-10, 2-2553-11. 2 2553-12, 2-2553-13 10"SE-SP-16 2-2551A-54, 2-2551A-53, 2-2551A-52, 2-2551A 72 05SP SP-017 6a Low SP-C-03A Medium None Low 10"SE-SP-16 2-2553-26, 2-2553-27, 2-2553-28, 2-2553-29, 2 6 CGE-2-2553 2 2553-30, 2-2553-31 05SP SP-018 6a Low SP-C-03B Medium None Low 8"SE-SP- 2-2553-14 16 CGE-2-2552 2 10"SE-SP-16 2-2553-15, 2-2553-16, 2-2553-17, 2-2553-18, 2 CGE-2-2553 2553-19, 2-2553-20. 2-2553-21, 2-2553-22, 2 2553-23, 2-2553-24, 2-2553-25 10*SE-SP-16 2-2552-54. 2-2552-53, 2-2552-52, 2-2552-75 O5SP SP-019 6a Low SP-C-03B Medium None Low 10"SE-SP-16 2-2553-53.2-2553-52.2-2553-51,2-2553-50, 2 8 CGE-2-2553 2 2553-49, 2-2553-48, 2-2553-47, 2-2553-46 05SP SP-023 6a Low SP-C-04A Medium None Low 10"SE-SP-16 2-2551A-51, 2-2551A-50, 2-2551A-49, 2-2551A 6 CGE-2-2551A 2

48. 2-2551A-47. 2-2551A-46 05SP SP-024 6a Low SP-C-04B Medium None Low 10"SE-SP-16 2-2552-51 20 CGE-2-2552 2 10"SE-SP-01 2-2552-50, 2-2552-49, 2-2552-48, 2-2552-47, 2 2552-46, 2-2552-45, 2-2552-44, 2-2552-43. 2 2552-42, 2-2552-41, 2-2552-40, 2-2552-39, 2 2552-38, 2-2552-37, 2-2552-36, 2-2552-35, 2 2552-34, 2-2552-33, 2-2552-32 05SP SP-025 6a Low SP-C-05A Medium None Low 10"SE-SP-16 2-2551A-45, 2-2551A-44, 2-2551A-43, 2-2551A 10 CGE-2-2551A 2 42, 2-2551A-41, 2-2551A-40, 2-2551A-39, 2 2551A-38, 2-2551A-37, 2-2551A-36 05SP SP-026 6a Low SP-C-05B Medium None Low 10"SE-SP-01 2-2552-31, 2-2552-30, 2-2552-29, 2-2552-28, 2 11 CGE-2-2552 2 2552-27, 2-2552-26, 2-2552-25, 2-2552-24, 2 2552-23, 2-2552-22, 2-2552-21 05SP SP-027 6a Low SP-C-06A Medium None Low 10"SE-SP-16 2-2551B-35, 2-2551B-34, 2-2551B-33, 2-2551B 6 CGE-2-2551B 2 32, 2-2551 B-31, 2-2551B-30 05SP SP-028 6a Low SP-C-06B Medium None Low 10"SE-SP-01 2-2552-19 1 CGE-2-2552 2 o5SP SP-029 6a Low SP-C-07A Medium None Low 10"SE-SP-16 2-2551B-29, 2-2551B-28, 2-2551B-27, 2-2551B 5 CGE-2-2551B 2 73, 2-2551B-26 17 of 20

C C VC Summer Risk Ranking Report, Rev. 1 (08126/2002)

Risk Characterization Consequence Failure Potential in WLines Weld Syst m Seaen Count Segment Category Rank ID Rank DMs Rank 05SP SP-030 6a Low SP-C-08A Medium None Low 10"SE-SP-16 2-2551B-25. 2-2551B-24, 2-2551B-23, 2-2551B 4 CGE-2-2551B 2 22 05SP SP-031 6a Low SP-C-09A Medium None Low 10"SE-SP-16 2-2551B-19, 2-2551B-18, 2-2551B-21 3 CGE-2-2551B 2 05SP SP-032 6a Low SP-C-09A Medium None Low 10"SE-SP-16 2-2551B-20 1 CGE-2-2551B 2 05SP SP-033 6a Low SP-C-09B Medium None Low 10"SE-SP-01 2-2552-18, 2-2552-16, 2-2552-15 3 CGE-2-2552 2 05SP SP-034 6a Low SP-C-09B Medium None Low 10"SE-SP-01 2-2552-17 1 CGE-2-2552 2 06MS MS-001 6a Low MS-C-01A Medium None Low 32"SE-MS-17 2-2100A-17, 2-2100A-18, 2-2100A-3, 2-2100A- 11 CGE-2-2100A 2

19. 2-2100A-4, 2-2100A-5, 2-2100A-15, 2 2100A-16, 2-2100A-6, 2-2100A-7, 2-2100A-8 06MS MS-002 6a Low MS-C-01B Medium None Low 32"SE-MS-17 2-2200A-18, 2-2200A-19, 2-2200A-3. 2-2200A- 11 CGE-2-2200A 2 20, 2-2200A-4, 2-2200A-5, 2-2200A-6, 2-2200A 17, 2-2200A-7, 2-2200A-8, 2-2200A-9 06MS MS-003 6a Low MS-C-01C Medium None Low 32"SE-MS-17 2-2300-13, 2-2300-14, 2-2300-3, 2-2300-15, 2- 13 CGE-2-2300 2 2300-4, 2-2300-5, 2-2300-6, 2-2300-12, 2-2300 7, 2-2300-8, 2-2300-9, 2-2300-10, 2-2300-11 06MS MS-004 6a Low MS-C-02A Medium None Low 32"SE-MS-05 2-2101A-1, 2-2101A-2, 2-2101A-3, 2-2101A-4, 19 CGE-2-2101A 2 2-2101A-5, 2-2101A-66, 2-2101A-6, 2-21O1A-7, 2-2101A-8, 2-2101A-9, 2-2101A-126, 2-2101A 10, 2-2101A-128, 2-2101A-129, 2-2101A-11,2 2101A-12, 2-2101A-13, 2-2101A-14, 2-2101A 15 06MS MS-005 6a Low MS-C-02B Medium None Low 32"SE-MS-06 2-2201A-1, 2-2201A-2, 2-2201A-3 3 CGE-2-2201A 2 06MS MS-006 6a Low MS-C-02C Medium None Low 32"SE-MS-07 2-2301-1, 2-2301-32,2-2301-2,2-2301-3, 2- 16 CGE-2-2301 2 2301-4, 2-2301-5, 2-2301-33, 2-2301-34, 2 2301-6, 2-2301-7, 2-2301-8, 2-2301-9 33 5"SE-MS-07 2-2301-10, 2-2301-35, 2-2301-11 32*SE-MS-07 2-2301-36 06MS MS-007 6a Low MS-C-03A Medium None Low 32"SE-MS-05 2-2101B-67, 2-2101B-16 2 CGE-2-2101B 2 06MS MS-008 6a Low MS-C-03B Medium None Low 32"SE-MS-06 2-2201A-4, 2-2201A-5, 2-2201A-57 14 CGE-2-2201A 2 33.5"SE-MS-06 2-2201A-6, 2-2201A-56, 2-2201A-7 32"SE-MS-06 2-2201A-58, 2-2201A-8, 2-2201A-9, 2-2201A 59, 2-2201A-10, 2-2201A-11, 2-2201A-60, 2 2201A-12 06MS MS-009 6a Low MS-C-03C Medium None Low 32"SE-MS-07 2-2301-12, 2-2301-13, 2-2301-14 3 CGE-2-2301 2 06MS MS-010 6a Low MS-C-04A Medium None Low 8"SE-MS-05 2-2101A-37BC 7 CGE-2-2101A 2 8"SE-MS-05 2-2101A-56, 2-21OIA-57, 2-2101A-58, 2-2101A 59, .-2101A-60, 2-2101A-61 06MS MS-01I 6a Low MS-C-04B Medium None Low 8"-SE-MS-06 2-2201A-17BC 7 CGE-2-2201A 2 8"SE-MS-06 2-2201A-27, 2-2201A-28, 2-2201A-29, 2-2201A 30, 2-2201A-31, 2-2201A-32 06MS MS-012 6a Low MS-C-04C Medium None Low 8SE-MS-07 2-2301-16BC, 2-2301-27, 2-2301-28, 2-2301- 7 CGE-2-2301 2 1 1 1 29, 2-2301-30, 2-2301-37, 2-2301-31 06MS MS-013 6a Low MS-C-05A Medium None Low 6"SE-MS-05 2-2101A-38BC 1 CGE-2-2101A 2 18 of 20

C C C VC Summer Risk Ranking Report, Rev. 1 (08126/2002)

Consequence Failure Potential in Weilnes S Weld Risk Characterization Segment Category Rank ID Rank DMs None I Rank Low 1 S 6"SE-MS-05 2-21OIA-39BC 1 CGE-2-2101A 2 06MS MS-014 6a Low MS-C-05B Medium 06MS MS-015 6a Low MS-C-05C Medium None Low 6"SE-MS-05 2-2101A-408C 1 CGE-2-2101A 2 06MS MS-016 6a Low MS-C-05C Medium None Low 6"SE-MS-05 2-2101A-41BC 1 CGE-2-2101A 2 06MS MS-017 6a Low MS-C-05E Medium None Low 6"SE-MS-05 2-2101A-42BC 1 CGE-2-2101A 2 06MS MS-018 6a Low MS-C-05F Medium None Low 6"-SE-MS-06 2-2201A-18BC 1 CGE-2-2201A 2 06MS MS-019 6a Low MS-C-O5G Medium None Low 6"-SE-MS-06 2-2201A-19BC 1 CGE-2-2201A 2 06MS MS-020 6a Low MS-C-05H Medium None Low 6"-SE-MS-05 2-2201A-20BC 1 CGE-2-2201A 2 06MS MS-021 6a Low MS-C-051 Medium None Low 6-SE-MS-06 2-2201A-21B3 1 CGE-2-2201A 2 06MS MS-022 6a Low MS-C-05J Medium None Low 6"-SE-MS-06 2-2201A-22BC 1 CGE-2-2201A 2 06MS MS-023 Oa Low MS-C-05K Medium None Low 6"SE-MS-07 2-2301-17BC 1 CGE-2-2301 2 06MS MS-024 6a Low MS-C-05K Medium None Low 6"SE-MS-07 2-2301-10BC 1 CGE-2-2301 2 O6MS MS-025 6a Low MS-C-O5M Medium None Low 6"SE-MS-07 2-2301-198C 1 CGE-2-2301 2 06MS MS-026 6a Low MS-C-O5N Medium None Low 6"SE-MS-07 2-2301-20BC 1 CGE-2-2301 2 06MS MS-027 6a Low MS-C-05P Medium None Low 6"SE-MS-07 2-2301-210BC 1 CGE-2-2301 2 06MS MS-028 6a Low MS-C-10A Medium None Low 14"Cap 2-2101A-36BC, 2-2101A-48, 2-2101A-49 3 CGE-2-2101A 2 06MS MS-029 6a Low MS-C-10C Medium None Low 14"SE-MS-07 2-2301-158C, 2-2301-23, 2-2301-24 3 CGE-2-2301 2 06MS MS-030 6a Low MS-C-11A Medium None Low 14"Cap 2-21018-43BC, 2-2101B-50, 2-2101B-51 3 CGE-2-2101B 2 O6MS MS-031 6a Low MS-C-11iB Medium None Low 14"Capped 2-2201 A-23BC, 2-2201A-25, 2-2201A-26 3 CGE-2-2201A 2 06MS MS-032 6a Low MS-C-11C Medium None Low 14"SE-MS-07 2-2301-22BC, 2-2301-25, 2-2301-26 3 CGE-2-2301 2 07FW FW-001 6a (3) Low (High) FW-C-O1A Medium None (FAC) Low (High) 18"-904 2-2103A-6 1 CGE-2-2103A 2 07FW FW-003 6a (3) Low (High) FW-C-01B Medium None (FAC) Low (High) 18"SE-FW-15 2-2203-7 1 CGE-2-2203 2 07FW FW-005 6a (3) Low (High) FW-C-01B Medium None (FAC) Low (High) 18"SE-FW-15 2-2203-6 1 CGE-2-2203 2 07FW FW-008 6a (3) Low (High) FW-C-01C Medium None (FAC) Low (High) 18"SE-FW-14 2-2303-5 1 CGE-2-2303 2 07FW FW-010 6a (3) Low (High) FW-C-02A Medium None (FAC) Low (High) 18"-904 2-2103A-3, 2-2103A-2 2 CGE-2-2103A 2 07FW FW-013 6a (3) Low (High) FW-C-02C Medium None (FAC) Low (High) 18"SE-FW-14 2-2303-4 1 CGE-2-2303 2 07FW FW-016 6a (3) Low (High) FW-C-03A Medium None (FAC) Low (High) 18"SA-106 2-2102A-15, 2-2102A-14 2 CGE-2-2102A 2 07FW FW-020 6a (3) Low (High) FW-C-03B Medium None (FAC) Low (High) 18"-P22 2-2202-13, 2-2202-12 2 CGE-2-2202 2 07FW FW-024 6a (3) Low (High) FW-C-03C Medium None (FAC) Low (High) 18"SE-FW-14 2-2302-15, 2-2302-14 2 CGE-2-2302 2 07FW FW-026 6a (3) Low (High) FW-C-03C Medium None (FAC) Low (High) 18"SE-FW-14 2-2302-11, 2-2302-10 2 CGE-2-2302 2 07FW FW-002 6a Low FW-C-O1A Medium None Low 18"-904 2-2103A-5 1 CGE-2-2103A 2 07FW FW-004 6a Low FW-C-O1B Medium None Low 18"SE-FW-15 2-2203-50 1 CGE-2-2203 2 07FW FW-006 6a Low FW-C-01B Medium None Low 18"SE-FW-15 2-2203-5, 2-220349,2-2203-4,2-2203-3 4 CGE-2-2203 2 07FW FW-007 6a Low FW-C-01C Medium None Low 18"SE-FW-14 2-2303-6 1 CGE-2-2303 2 O7FW FW-009 6a Low FW-C-02A Medium None Low 18"-904 2-2103A-4 1 CGE-2-2103A 2 O7FW FW-011 6a Low FW-C-02A Medium None Low 18"-904 2-2103A-1 1 CGE-2-2103A 2 O7FW FW-012 6a Low FW-C-02B Medium None Low 18"SE-FW-15 2-2203-2, 2-2203-1 2 CGE-2-2203 2 19 of 20

(7 C C VC Summer Risk Ranking Report, Rev. 1 (08126/2002)

System Risk11_____Lns Characterization Consequence Failure Potential Welds Welds In Segment Wl kthN~)

07FW Segment FW-014 Category 6a Rank Low ID FW-C-02C Rank Medium DMs None Rank Low Segment 18"SE-FW-14 2-2303-3, 2-2303-2. 2-2303-1 Weld Count 3 CGE-2-2303 E

2 07FW FW-015 6a Low FW-C-03A Medium None Low 18"SA-106 2-2102A-18, 2-2102A-17, 2-2102A-16 3 CGE-2-2102A 2 07FW FW-017 6a Low FW-C-03A Medium None Low 18"SA-106 2-2102A-13, 2-2102A-32, 2-2102A-31,2-2102A, 6 CGE-2-2102A 2 30, 2-2102A-29, 2-2102A-28 07FW FW-019 6a Low FW-C-03B Medium None Low 18"-P22 2-2202-16, 2-2202-15, 2-2202-14 3 CGE-2-2202 2 07FW FW-021 6a Low FW-C-03B Medium None Low 18"-P22 2-2202-25, 2-2202-24, 2-2202-23, 2-2202-22 4 CGE-2-2202 2 07FW FW-023 6a Low FW-C-03C Medium None Low 18"SE-FW-14 2-2302-27, 2-2302-26, 2-2302-25, 2-2302-24. 2 12 CGE-2-2302 2 2302-23, 2-2302-22, 2-2302-21, 2-2302-20, 2 2302-19, 2-2302-18, 2-2302-17, 2-2302-16 07FW FW-025 6a Low FW-C-03C Medium None Low 18"SE-FW-14 2-2302-13, 2-2302-12 2 CGE-2-2302 2 07FW FW-027 6a Low FW-C-03C Medium None Low 18"SE-FW-14 2-2302-9, 2-2302-8, 2-2302-7, 2-2302-6, 2- 8 CGE-2-2302 2 2302-5, 2-2302-36. 2-2302-35, 2-2302-34 09SW SW-001 6a (5a) Low SW-C-O1A Medium None (MIC, Low 16"SE-SW-24 2-2556A-1, 2-2556A-2, 2-2556A-3, 2-2556A-4, 9 CGE-2-2556A 2 (Medium) PIT) (Medium) 2-2556A-5, 2-2556A-6, 2-2556A-7, 2-2556A-31, 2-2556A-8 O9SW SW-002 6a (5a) Low SW-C-O1A Medium None (MIC, Low 12"SW 2-2556A-29, 2-2556A-28 2 CGE-2-2556A 2 (Medium) PIT) (Medium) 09SW SW-003 6a (5a) Low SW-C-01B Medium None (MIC, Low 16"SE-SW-22 2-2557A-1, 2-2557A-2, 2-2557A-3, 2-2557A-4, 12 CGE-2-2557A 2 (Medium) PIT) (Medium) 2-2557A-5, 2-2557A-6, 2-2557A-7, 2-2557A-8, 2-2557A-9, 2-2557A-1 0, 2-2557A-1 1, 2-2557A

__________12 09SW SW-004 6a (5a) Low SW-C-011B Medium None (MIC, Low 12"SW 2-2557A-37, 2-2557A-36, 2-2557A-35, 2-2557A 4 CGE-2-2557A 2 (Medium) PIT) (Medium) 34 O9SW SW-005 6a (5a) Low SW-C-02A Medium None (MIC, Low 16"SE-SW-23 2-2556A-11, 2-2556A-12, 2-2556A-13, 2-2556A 4 CGE-2-2556A 2 (Medium) PIT) (Medium) 14 09SW SW-006 6a (5a) Low SW-C-02B Medium None (MIC, Low 16"SE-SW-25 2-2557A-15, 2-2557A-16, 2-2557A-17, 2-2557A. 4 CGE-2-2557A 2 (Medium) PIT) (Medium) 18 03SI SI-009 7a Low IL-C-02C Low None Low 2*SI 2-3007-10, 2-3007-11, 2-3007-12, 2-3007-13 4 CGE-2-3007 2 03SI SI-018 7a Low IL-C-06 Low None Low 10"SE-SI-03 2-2554-1, 2-2554-2, 2-2554-3, 2-2554-29, 2- 7 CGE-2-2554 2 2554-4, 2-2554-5, 2-2554-6 03SI SI-019 7a Low IL-C-07 Low None Low 10SE-SI-18 2-2554-7, 2-2554-8, 2-2554-9, 2-2554-10 10 CGE-2-2554 2 6"SE-SI 2-2554-18, 2-2554-17, 2-2554-16, 2-2554-15, 2 2554-14, 2-2554-13 03SI SI-020 7a Low IL-C-07 Low None Low 10"SE-SI-18 2-2554-11, 2-2554-12 12 CGE-2-2554 2 6"SE-SI 2-2554-28, 2-2554-27, 2-2554-26, 2-2554-25, 2 2554-24, 2-2554-23, 2-2554-22, 2-2554-21, 2 2554-20, 2-2554-19 05SP SP-020 7a Low SP-C-03X1 Low None Low 10"SE-SP-16 2-2553-32, 2-2553-33, 2-2553-34, 2-2553-35, 2- 5 CGE-2-2553 2 1__ _2553-36 1 05SP SP-021 7a Low SP-C-03X2 Low None Low 10"SE-SP-16 2-2553-45, 2-2553-44, 2-2553-43, 2-2553-42, 2- 5 CGE-2-2553 2 2553-41 05SP SP-022 7a Low SP-C-03X2 Low None Low 10"SE-SP-16 2-2553-37, 2-2553-38, 2-2553-39, 2-2553-40 4 CGE-2-2553 2 20 of 20

VC Summer Risk Ranking Summary, Rev I System Risk Consequence Failure Potential Weld ICCIcc Selections Selections Made Category Rank Rank DMs Rank Count Required Class I Class 2 Total O1RC 2 High High TASCS, TT Medium 23 1 8 01RC 2 High High TT. PWSCC Medium 4 1 2 O1RC 2 High High TASCS Medium 2 1 21 0 - 21 O1RC 2 High High TT Medium 36 1 7 01RC 2 High High PWSCC Medium 18 1 4 02RHR 2 High High TASCS Medium 5 1 2 2 - 2 03SI 2 High High TASCS, TT Medium 7 1 4 03SI 2 High High TASCS Medium 13 1 7 1 7 03S] 2 High High TT Medium 8 1 2 04CS 2 High High TASCS, TT Medium 7 1 1

- 7 77 04CS 2 High High -" Medium 18 1 6 08EF 2 High High TT Medium 3 2 1 1 1 O1RC 4 Medium High None Low 172 1 18 18 - 18 02RHR 4 Medium High None Low 3 - - 1 6 3 66 02RHR 4 Medium High None Low 50 2 3 03SI 4 Medium High None Low 28 1 13 2

- 22 22 03SI 4 Medium High None Low 187 2 9 04CS 4 Medium High None Low 11 1 2 2 - 2 05SP 4 Medium High None Low 7 2 1 1 1 O8EF 4 Medium High None Low 5 2 1 1 1 02RHR 5a Medium Medium TASCS Medium 6 2 1 1 1 03SI 5a Medium Medium TT. IGSCC Medium 4 1 1 03SI 6a Medium Medium 17 Medium 10 1 3 0 3 03SI 5a Medium Medium IGSCC Medium 16 1 2 04CS 5a Medium Medium TT Medium 4 1 1 1 1 07FW 5a Medium Medium TASCS Medium 7 2 1 - 1 1 0IRC 6a Low Medium None Low 7 1 0 02RHR 6a Low Medium None Low 18 1 02RHR 6a Low Medium None Low 219 2 03SI 6a Low Medium None Low 283 1 0 03SI 6a Low Medium None Low 235 2 04CS 6a Low Medium None Low 64 1 04CS 6a Low Medium None Low 305 2 05SP 6a Low Medium None Low 226 2 0 -

06MS 6a LOW Medium None Low 143 2 0 - o 07FW 6a (3) Low (High) Medium None (FAC) Low (High) 15 2 0 07FW 6a Low Medium None Low 52 2 0 -

09SW 6a (5a) Low (Medium) Medium None (MIC, PIT) Low (Medium) 35 2 0 03SI 7a Low Low None Low 33 2 0 05SP 7a Low Low None Low 14 2 0 -

Page 1 of 1

VC SUMMER RI-ISI DELTA RISK ANALYSIS, Rev. 4 Introduction The delta risk analysis estimates the risk changes between the present Section XI program (SXI) and the proposed risk-informed program (RI-ISI). Limits are imposed by the EPRI Methodology (TR-1 12657, Reference 1) to ensure that the change in risk of implementing the RI-ISI Program meets the requirements of Regulatory Guides 1.174 (Reference 2) and 1.178 (Reference 3). Licensing commitment changes must result in a risk reducti6n or any increase must be small enough to be considered risk neutral. With regard to increases, the criteria established require the cumulative change in core damage frequency (CDF) and large, early release frequency (LERF) is less than 1E-7 and 1E-8 per year per system, respectively.

Summary of Results As shown in Table 1, a small decrease in risk is estimated from implementing the RI-ISI program (or a small increase in risk, if an improvement in probability of detection (POD) is not credited). All systems show a slight risk decrease, if an improvement in POD is credited. If an improvement in POD is not credited, the systems with a slight risk increase meet the 1E-7 and 1E-8 criteria for CDF and LERF. This conclusion also applies for the total CDF and LERF values.

Analysis This analysis is in accordance with the EPRI Methodology (Section 3.7 of Reference 1).

The following are excluded in the analysis for the reasons provided:

1. Risk Categories 6 and 7 (low risk) are excluded from analysis (based on Section 3.7 of Reference 1) because these have insignificant impact on risk.

2. FAC - welds in the FAC Program scope and with no other damage mechanism identified are excluded from the delta risk analysis because they remain in the FAC program and since there is no change in the program there is no change in risk.

3. IGSCC - welds in the IGSCC Program scope (non-Category A welds) and with no other degradation mechanism are excluded from the delta risk analysis because they remain in the IGSCC program and since there is no change in the program there is no change in risk.

4. Surface Examination - welds that receive only a surface examination in the present Section XI program (i.e., volumetric examination is not performed) are not credited in the delta risk calculation.

The difference in risk between the two inspection programs is estimated with the following equation per Reference 1:

Ns*POD s*R - Nr*PODr*R S=

Where:

N, is the number of inspections in the existing Section XI program Nr is the number of inspections in the proposed RI-ISI program PODs is the probability of detection associated with the existing Section XI program I

VC SUMMER RI-ISI DELTA RISK ANALYSIS, Rev. 4

• PODr is the probability of detection associated with the proposed RI-ISI program R is the risk associated with the inspected location (independent of ISI program)

The risk associated with each risk category is based on the values for the conditional core damage probabilities (CCDPs), the conditional large early release probabilities (CLERPs), the Break Frequencies (Failure Rates) and the Probabilities of Detection (PODs), given in Tables 3. Those values are discussed below.

The best estimate and upper bound break frequencies are as follows:

"* Best estimates are based on References 9 and 14 of the methodology (Reference 1) where 1E-8/weld year is used when there is no degradation mechanism and 2E 7/weld year is used when there is a degradation mechanism other than FAC.

"* Upper bound values of 1E-6 and 1E-5/weld year are suggested in Reference 1 in place of the best estimate values for sensitivity analysis.

CCDP and CLERP values are as follow:

"* CCDP and CLERP used for the high consequence category segments are based on the highest evaluated CCDP (3.8E-03) and CLERP (1.1E-03)

"* For the medium consequence category segments, bounding estimates of CCDP (1E-04) and CLERP (lE-05) are used.

"* For the low consequence category segments, bounding estimates of CCDP (1E-06) and CLERP (lE-07) are used.

POD credit is treated as follows consistent with Reference 1:

" The "without POD improvement" cases ("WO/POD") utilize a POD equal to 0.5 for all examinations.

" The cases that credit POD improvements ("W/POD") utilize the following POD:

- For Section XI welds with Thermal Fatigue identified, POD of 0.3 is used

- For RI-ISI welds with Thermal Fatigue identified, POD of 0.9 is used

- For all other welds, POD of 0.5 is used.

Two sets of calculations are performed as summarized below:

1. Best Estimate: Table 1 provides the best estimate results, which are based on the best estimate break frequencies and on both, an improved POD for RI-ISI, and a POD were improvement was not credited.

2. Upper Bound: Table 2 provides the upper bound results, which are based on the upper bound break frequencies and on both, an improved POD for RI-ISI, and a POD were improvement was not credited.

2

VC SUMMER RI-ISI DELTA RISK ANALYSIS, Rev. 4 References

1. EPRI TR-112657 "Revised Risk-Informed Inservice Inspection Evaluation Procedure" Final Report, Rev. B-A, December 1999.

2. RG 1.174, July 1998, "An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis" 3

C C Table 1: A Bounding Estimate of the Risk Impact Based on the Best Estimate Failure Rates

!,Riskr Consequence , ii,, , . Wt*Best  ;-

, CDF Impact ',

,= . .

CSystdm ategory6 Rn Upper Bound F. PotentlalH EstImate  :: *POD>... .+/-Js*2&Inspections _____ ,*LERFImpact*3/4, CCDPBe Damage* *oRank* *FallUre. {8efore.

fCLERP*

IRAfter, Section XI ; Rt-SI-8 Delta vwIPODr- wolPOD w/PODj!. wolPODt CS CAT2 HIGH 3.80E-03 1.10E-03 TT MEDIUM 2.00E-07 0.3 0.9 0 6 6 -4.10E-09 -2.28E-09 -1.19E-09 -6.60E-10 CS CAT2 HIGH 3.80E-03 1.10E-03 TT, TASCS MEDIUM 2.0OE-07 0.3 0.9 0 1 1 -6.84E-10 -3.80E-10 -1.98E-10 -1.10E-10 CS CAT4 HIGH 3 80E-03 1.10E-03 N LOW 1.00E-08 05 05 0 2 2 -3.80E-11 -3.80E-11 -1.10E-11 -1.10E-11 CS CAT5 MEDIUM 1.00E-04 1.00E-05 TT MEDIUM 2.00E-07 0.3 0.9 0 1 1 -1.80E-11 -1.00E-11 -1.80E-12 -1.00E-12 CS CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.OOE-08 0.5 0.5 16 0 -16 Negligible Negligible Negligible Negligible CS Total -4.8E-09 -2.7E-09 -1.4E-0% -7.8E-10 EF CAT2 HIGH 3.80E-03 1.10E-03 TT MEDIUM 2.00E-07 0.3 9.00E-01 1 1 0 -4.56E-10 0004E00 -1.32E-10 0.OOE+00 EF CAT4 HIGH 3.80E-03 1.102-03 N LOW 1.00E-08 0.5 0.5 2 1 -1 1.90E-11 1.90E-11 5.50E-12 5.50E-12 EF Total -4.4E-10 1.9E-11 -1.32-10 5.5E-12 FW CAT6 (3) MEDIUM 1.00E-04 1.00E-05 NONE LOW 1.00E-08 0.5 0.5 1 0 -1 Negligible Negligible Negligible Negligible (FAC) _

FW CAT5 MEDIUM 1.00E-04 1.00E-05 TASCS MEDIUM 2.00E-07 0.3 0.9 1 1 0 -1.20E-11 No change -1 20E-12 No change FW CAT6 MEDIUM 1.O0E-04 1.00E-05 N LOW 1.00E-08 0.5 0.5 6 0 -6 Negligible Negligible Negligible Negligible FW Total -1.2E-11 Negligible -1.2E-12 Negligible MS CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.00E-08 0.5 0.5 11 0 -11 Negligible Negligible Negligible Negligible MS Total Negligible Negligible Negligible Negligible RC CAT2 HIGH 3.80E-03 1.10E-03 PWSCC MEDIUM 2.00E-07 0.5 0.5 18 4 -14 5 32E-09 532E-09 1.54E-09 1.542-09 RC CAT2 HIGH 3 80E-03 1.10E-03 TASCS MEDIUM 2.00E-07 0.3 0.9 0 0 0 No change No change No change No change RC CAT2 HIGH 3.80E-03 1.10E-03 TT MEDIUM 2.00E-07 03 0.9 7 7 0 -3.19E-09 No change -9242-10 No change RC CAT2 HIGH 3.80E-03 1.10E-03 UT, MEDIUM 2.00E-07 0.3 09 4 2 -2 -4.56E-10 7.60E-10 -1.32E-10 2.20E-10 PWSCC I I RC CAT2 HIGH 3.80E-03 1.10E-03 TT, TASCS MEDIUM 2.00E-07 0.3 09 9 8 -1 -3.42E-09 3.80E-10 -9.90E-10 1.10E-10 RC CAT4 HIGH 3.80E-03 1.10E-03 N LOW 1.00E-08 05 0.5 37 18 -19 3 61E-10 3.61E-10 1.05E-10 1.05E-10 RC CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.00E-08 0.5 0.5 0 0 0 No change No change No change No change RC Total -1.4E-09 6.8E-09 -4.0E-10 2.0E-09 RHR CAT2 HIGH 3.80E-03 1.10E-03 TASCS MEDIUM 2.00E-07 0.3 0.9 2 2 0 -9.12E-10 No change -264E-10 No change RHR CAT4 HIGH 3.80E-03 1.10E-03 N LOW 1.00E-08 0.5 0.5 0 6 6 -1.14E-10 -1.14E-10 -3.30E-11 -3.30E-11 RHR CAT5 MEDIUM 1.00E-04 1.00E-05 TASCS MEDIUM 2.00E-07 0.3 0.9 0 1 1 -1.80E-11 -1.00E-11 -1.802-12 -1.00E-12 RHR CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.002-08 0.5 0.5 17 0 -17 Negligible Negligible Negligible Negligible RHR Total -1.0E-09 -1.22-10 -3.0E-10 -3.4E-11 4

C C Table 1: A Bounding Estimate of the Risk Impact Based on the Best Estimate Failure Rates sn,'Rlsk,;- Consequence F, -;' w, .. , , , maty jUystpper,,Bo a hd. Potbnthal;, Etliateý dFare POD ,izý-4 nspec s.- COF _______.I.pact

... '3 . *CCDPI, "CLERPo 'Damageo rRank*: ,,4Faifre *i÷'*AfterSclto I DBefore-TwIw/P -

,-I 'wDelta woIO wODo/wPOD, SI CAT2 HIGH 3.80E-03 1.10E-03 TASCS MEDIUM 2.00E-07 0.3 0.9 5 1 -4 4.56E-10 1.52E-09 1.322-10 4.40E-10 SI CAT2 HIGH 3.80E-03 1.10E-03 "1 MEDIUM 2.OOE-07 0.3 09 7 2 -5 2.28E-10 1.90E-09 6.60E-11 5.50E-10 SI CAT2 HIGH 3.80E-03 1.10E-03 TT, TASCS MEDIUM 2.00E-07 0.3 0.9 5 4 -1 -1.60E-09 3.80E-10 -4 62E-10 1.10E-10 SI CAT4 HIGH 3.80E-03 1.10E-03 N LOW 1.00E-08 0.5 0.5 28 22 -6 1.142-10 1.142-10 3.30E-11 330E-11 Si CAT5 MEDIUM 1.00E-04 1.00E-05 IGSCC LOW 1.00E-08 0.5 0.5 0 2 2 -2.00E-11 -2.00E-11 -2.00E-12 -2.00E-12 SI CAT5 MEDIUM 1.00E-04 1.00E-05 TT MEDIUM 2.00E-07 0.3 0.9 0 0 0 No change No change No change No change SI CAT5 MEDIUM 1.002-04 1.00E-05 TT. IGSCC MEDIUM 2 00E-07 0.3 0.9 0 1 1 -1.80E-11 -1.00E-11 -1.80E-12 -1.00E-12 SI CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.00E-08 0.5 0.5 45 0 -45 Negligible Negligible Negligible Negligible SI CAT7 LOW 1.00E-06 1.00E-07 N LOW 1.00E-08 0.5, 0.5 3 0 -3 Negligible Negligible Negligible Negligible SI Total -8.4E-10 3.9E-09 -2.3E-10 1.1 E-09 SP CAT4 HIGH 3.80E-03 1.10E-03 N LOW 1.00E-08 0.5 0.5 0 1 1 -1.90E-11 -1.90E-11 -5.50E-12 -5.50E-12 SP CAT6 MEDIUM 1.OOE-04 1.002-05 N LOW 1.00E-08 0.5 0.5 11 0 -11 Negligible Negligible Negligible Negligible SP CAT7 LOW 1.00E-06 1.00E-07 N LOW 1.00E-08 0.5 05 0 0 0 No change No change No change No change SP Total -1.9E-11 -1.9E-11 -5.5E-12 -5.5E-12 SW CAT6 (5) MEDIUM 1.00E-04 1.00E-05 NONE LOW 2.00E-07 0.5 0.5 5 0 -5 Negligible Negligible Negligible Negligible

______________ MIC, PIT) (MEDIUM) ___ ___

SW Total PNegligible Negligible Negligible Negligible Overall Change in Risk -8.6E-09 7.9E-09 -2.5E-09 2.3E-09 5

( (

Table 2: A Bounding Estimate of the Risk Impact Based on the Upper Bound Failure Rates

• 1 zSystem Ca'r' oU"*n14j1 btenF, i 66 LERF Imnpact~

RCCDP:*.* -C *;CLERPj* qDamage,ý :,Rankn BdufdFallur Before, After, Section RI-ISI Delta _jw/POD* woIPODi ',,wIPODrý, *wo/POD,

_____A~Me-halri ýz XI1Rt~ ~ ~ -'2, CS CAT2 HIGH 3.80E-03 1.10E-03 TT MEDIUM 1.00E-05 0.3 0.9 0 6 6 -2.05E-07 -1.14E-07 -5 94E-08 -3.30E-08 CS CAT2 HIGH 3.80E-03 1.10E-03 TT, TASCS MEDIUM 1.00E-05 0.3 0.9 0 1 1 -3 42E-08 -1.90E-08 -9.90E-09 -5.50E-09 CS CAT4 HIGH 3 80E-03 1.10E-03 N LOW 1.00E-06 0.5 0.5 0 2 2 -3.80E-09 -3.80E-09 -1.10E-09 -1.10E-09 CS CAT5 MEDIUM 1.00E-04 1.00E-05 TT MEDIUM 1.00E-05 0.3 0.9 0 1 1 -900E-10 -5.OOE-10 -9 00E-11 -5 00E-11 CS CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.00E-06 0.5 0.5 16 0 -16 Negligible Negligible Negligible Negligible CS Total -2.4E-07 -1.4E-07 -7.OE-08 -4.0E-08 EF CAT2 HIGH 3 80E-03 1.10E-03 TT MEDIUM 1.00E-05 03 0.9 1 1 0 -2.28E-08 No change -6 60E-09 No change EF CAT4 HIGH 3 80E-03 1.10E-03 N LOW 1.00E-06 0.5 05 2 1 -1 1.90E-09 1.90E-09 5.50E-10 5 50E-10 EF Total -2.1E-08 1.9E-09 -6.1 E-09 5.5E-10 FW CATO (3) MEDIUM 1.OOE-04 1.00E-05 NONE (FAC) LOW 1.00E-06 05 0.5 1 0 -1 Negligible Negligible Negligible Negligible FW CAT5 MEDIUM 1.00E-04 1.00E-05 TASCS MEDIUM 1.00E-05 0.3 0.9 1 1 0 -6 O0E-10 No change -6 00E-11 No change FW CATO MEDIUM 1.OOE-04 1.00E-05 N LOW 1.OOE-06 0.5 0.5 6 0 -6 Negligible Negligible Negligible Negligible FW Total -6.02-10 Negligible -6.0E-11 Negligible MS CAT6 MEDIUM 1.00E-04 1.OOE-05 N LOW 1.00E-06 0.5 0.5 11 0 -11 Negligible Negligible Negligible Negligible MS Total Negligible Negligible Negligible Negligible RC CAT2 HIGH 3 80E-03 1.10E-03 PWSCC MEDIUM 1.00E-05 05 0.5 18 4 -14 2.66E-07 2.66E-07 7.70E-08 7.70E-08 RC CAT2 HIGH 3 80E-03 1.10E-03 TASCS MEDIUM 1.002-05 0.3 0.9 0 0 0 No change No change No change No change RC CAT2 HIGH 3.80E-03 1.10E-03 TT MEDIUM 1.OOE-05 0.3 0.9 7 7 0 -1 60E-07 No change -4.62E-08 No change RC CAT2 HIGH 3.80E-03 1.10E-03 TT. PWSCC MEDIUM 1.OOE-05 0.3 0.9 4 2 -2 -2.28E-08 3 80E-08 -6 60E-09 1.10E-08 RC CAT2 HIGH 3 80E-03 1.10E-03 TT, TASCS MEDIUM 1.OOE-05 0.3 09 9 8 -1 -1.71E-07 1.90E-08 -4.95E-08 5.50E-09 RC CAT4 HIGH 3.80E-03 1.10E-03 N LOW 1.00E-06 0.5 0.5 37 18 -19 3 61E-08 3 61E-08 1.05E-08 1.05E-08 RC CAT6 MEDIUM 1.00E-04 1.OOE-05 N LOW 1.O0E-06 05 0.5 0 0 0 No change No change No change No change RC Total -5.1E-08 3.6E-07 -1.5E-08 1.OE-07 RHR CAT2 HIGH 3.80E-03 1.10E-03 TASCS MEDIUM 1 OOE-05 0.3 0.9 2 2 0 -4.56E-08 No change -1.32E-08 No change RHR CAT4 HIGH 3.80E-03 1.10E-03 N LOW 1.002-06 0.5 0.5 0 6 6 -1.14E-08 -1.14E-08 -3 30E-09 -3.30E-09 RHR CAT5 MEDIUM 1 00E-04 1.00E-05 TASCS MEDIUM 1.00E-05 0.3 09 0 1 1 -900E-10 -5.00E-10 -9.00E-11 -5.00E-11 RHR CATS MEDIUM 1.00E-04 1.00E-05 N LOW 1.00E-06 0.5 05 17 0 -17 Negligible Negligible Negligible Negligible RHR Total -5.8E-08 -1.2E-08 -1.7E-08 -3.4E-09 6

C ( C Table 2: A Bounding Estimate of the Risk Impact Based on the Upper Botnd Failttre Rates 7

fSitii?

'_kliký:F~ doqhiience K1fN0lpe CC flol~ dii fi PODIUO'i Inspections m~

-,wo/POD. ,

IEO L4D Win~'

- 'wIPOD

,wo/POD

,,.Category; , ,CCDPtAfter ,. LE *Damag o1 R Bo Frd aiu Before r Section SwcPODn RI-iSi Delta RinkIAI hlBnký. BCaUgor Det gCLERPZý, tRank SI CAT2 HIGH 3 80E-03 1.10E-03 TASCS MEDIUM 1.OOE-05 0.3 0.9 5 1 -4 2.28E-08 7.60E-08 6 60E-09 2.20E-08 SI CAT2 HIGH 3 80E-03 1.10E-03 IT MEDIUM 1.00E-05 0.3 09 7 2 -5 1.14E-08 9.50E-08 3 30E-09 2.75E-08 SI CAT2 HIGH 3.80E-03 1.10E-03 TT, TASCS MEDIUM 1 00E-05 03 09 5 4 -1 -7.98E-08 1.90E-08 -2 31E-08 5.50E-09 SI CAT4 HIGH 3 80E-03 1.10E-03 N LOW 1 00E-06 05 0.5 28 22 -6 1.14E-08 1.14E-08 3.30E-09 3.30E-09 SI CAT5 MEDIUM 1.00E-04 1.00E-05 IGSCC LOW 1.00E-06 0.5 0.5 0 2 2 -1.00E-09 -1.00E-09 -1.00E-10 -1.00E-10 SI CAT5 MEDIUM 1.00E-04 1.00E-05 TT MEDIUM 1 OOE-05 0.3 0.9 .0 0 0 No change No change No change No change SI CAT5 MEDIUM 1.0OE-04 1 00E-05 TT, IGSCC MEDIUM 1.00E-05 0.3 0.9 0 1 1 -9 00E-10 -5 00E-10 -9 00E-11 -5.00E-11 SI CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.00E-06 0.5 0.5 45 0 -45 Negligible Negligible Negligible Negligible SI CAT7 LOW 1.00E-06 1.00E-07 N LOW 1.00E-06 0.5 0.5 3 0 -3 Negligible Negligible Negligible Negligible SI Total -3.6E-08 2.0E-07 -1.0E-08 5.8E-08 SP CAT4 HIGH 3.80E-03 1.10E-03 N LOW 1.00E-06 0.5 0.5 0 1 1 -1.90E-09 -1.90E-09 -5.50E-10 -5.50E-10 SP CAT6 MEDIUM 1.00E-04 1.00E-05 N LOW 1.00E-06 0.5 0.5 11 0 -11 Negligible Negligible Negligible Negligible SP CAT7 LOW 1.00E-06 1.00E-07 N LOW 1.00E-06 0.5 0.5 0 0 0 No change No change No change No change SP Total -1.9E-09 -1.9E-09 -5.5E-10 -5.5E-10 SW CAT6 (5) MEDIUM 1.00E-04 1.002-05 NONE (MIC. LOW 1.002-05 0.5 0.5 5 0 -5 Negligible Negligible Negligible Negligible

_______ _______ ________ PIT) (MEDIUM) _____ ___

SW Total Negligible Negligible Negligible Negligible Grand .4.1E-07 4.1E-07 -I1.2E-07 1.2E-07 Total I 7

C C Table 3: Inputs to the Calculations Consequence Upper Bound Failure Potential Best Estimate Upper Bound POD Rank Failure Rate Failure Rate Ran CCDP CLERP I!air Damage Mechanisms Rank ae FiueRt Before After High 3.80E-03 1.10E-03 FAC High 2.O0E-06 1.00E-04 N/A N/A Medium 1.OOE-04 1.00E-05 TASCS, TT Medium 2.OOE-07 1.OOE-05 0.3 0.9 IGSCC, TGSCC, PWSCC, 0.5 0.5 ECSCC, MIC, PIT, CC, E-C Low 1.OOE-06 1.OOE-07 None Low 1.OOE-08 1.OOE-06 0.5 0.5 8

SUMMARY

OF THE BEST ESTIMATE RESULTS, Rev. 4 System CDF Impact LERF Impact wlPOD wolPOD wlPOD woIPOD CS -4.84E-09 -2.71E-09 -1.40E-09 -7.82E-10 EF -4.37E-10 1.90E-11 -1.27E-10 5.50E-12 FW -1.20E-11 O.OOE+00 -1.20E-12 O.OOE+00 MS O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00 RC -1.39E-09 6.82E-09 -4.02E-10 1.97E-09 RHR -1.04E-09 -1.24E-10 -2.99E-10 -3.40E-1 I SI -8.36E-10 3.88E-09 -2.35E-10 1.13E-09 SP -1.90E-11 -1.90E-1I -5.50E-12 -5.50E-12 SW 0.OOE+00 0.OOE+00 0.00E+00 0.00E+00 Total -8.58E-09 7.87E-09 -2.47E-09 2.29E-09

C (7 A Bounding Estimate of the Risk Impact Based on the Best Estimate Failure Rates, Rev. 4 Risk Category Consequence Upper Bound Failure Potential Best Estimate POO Inspections CDF Impact LERF Impact System Rank CCDP CLERP Damage Mechanisms Rank Failure Rate before after Section XI R14SI Delna wIPOD woIPOD wrPOD wofPOD CS CAT2 HIGH 3 80E-03 I 10E-03 TT MEDIUM 2 00E-07 03 09 0 a 6 -4 10E-09 -2 28E-09 -1 19E-09 -660E-10 CS CAT2 HIGH 3 80E-03 1 IOE-03 TT, TASCS MEDIUM 2 00E-07 03 09 0 1 1 -6 84E.10 -3 80E 8E-A0 -A.10E-l0 CS CAT4 HIGH 3 80E-03 1 1OE-03 N LOW I OOE-08 05 05 0 2 2 -3 80E-11 -3 80E-11 -1.10E-11 -1.10E-11 CS CAT5 MEDIUM I OOE-04 1 OOE-05 TT MEDIUM 2 00E-07 03 09 0 1 1 .1 80E-11 -1 OOE-11 -1 80E-12 -1 00E-12 CS CATO MEDIUM 100E-04 I OOE-05 N LOW 1OOE-08 05 05 16 0 -16 0 0 0 0 CS Total 10 .4 8E-09 .2 7E-09 -14E-09 .7 8E-10 EF CAT2 HIGH 3 80E-03 1.10E-03 TT MEDIUM 2 00E-07 03 9 00E-01 1 1 0 -4 56E-10 0 00E400 .1 32E-10 0 002E00 EF CAT4 HIGH 3 80E-03 1.10E-03 N LOW 1 00E-08 05 05 2 1 -1 1901E-11 1 90E-11 5 50E-12 5 502-12 EF Total 2 -4 4-10 1 9E-11 .1 3E-10 S 5E.12 FW CATO (3) MEDIUM 100-E04 1 00E-05 NONE (FAC) LOW l OOE-08 05 05 1 0 -1 0 0 0 0 FW CAT5 MEDIUM 1 0OE-04 100E-05 TASCS MEDIUM 2 00E-07 03 09 1 1 0 .1 20E-11 0 002E00 -1 20E-12 0OOE+00 FW CATO MEDIUM 1OOE-04 1 00E-05 N LOW 1 00E-08 05 05 6 0 -6 0 0 0 0 FW Total 1 -1 2E-11 0 0E+00 -1 2E-12 0 02+00 MS CATS MEDIUM 1 00E-04 1 00E-05 N LOW 1 00E-08 05 05 11 0 -11 0 0 0 0 MS Total 0 0 0E400 0 0E+00 0 0E+00 0 02+00 RC CAT2 HIGH 3 80E-03 1.10E-03 PWSCC MEDIUM 2 00E-07 05 05 18 4 -14 5 32E-09 5 32E-09 I 54E.09 I 54E-09 RC CAT2 HIGH 3 80E-03 I IOE-03 TASCS MEDIUM 2 00E-07 03 09 0 0 0 0002E00 0 00E+00 0004E00 0 00E200 RC CAT2 HIGH 3 80E-03 1I 0E-03 TT MEDIUM 2 00E-07 03 09 7 7 0 .3 19E-09 0 002E00 -924E.10 0 00+E00 RC CAT2 HIGH 3 80E-03 I IOE-03 TT, PWSCC MEDIUM 2 00E-07 03 09 4 2 -2 -4 562-10 7 60E210 .1 32E-10 2 20E-10 RC CAT2 HIGH 3 80E-03 1 1E-03 TT, TASCS MEDIUM 200E-07 03 09 9 8 -1 -3 42E-09 3 80E.10 -9 902-10 1.10E-10 RC CAT4 HIGH 3 80E-03 1.10E-03 N LOW 1 00E-08 05 05 37 18 -19 3 61E-10 3 61E-10 1051E-10 105E.10 RC CATS MEDIUM I 0OE-04 1 00E-05 N LOW I O0E-08 05 05 0 0 0 0 0 0 0 RC Total 1_ 39 .1 4E.09 6 8E-09 -4 OE-10 2 0E.09 RHR CAT2 HIGH 3 80E-03 1.1OE-03 TASCS MEDIUM 2 00E-07 03 09 2 2 0 -9 12E-10 0004E00 -264E-10 0OOE+00 RHR CAT4 HIGH 3 80E-03 1.10r-03 N LOW IlOE-08 05 05 0 6 6 -1 141-10 -1 14E-10 -330E-11 -3 30E-11 RHR CATS MEDIUM 1 00-E04 1 0OE-0S TASCS MEDIUM 2 00E.07 03 09 0 1 1 -1 80E-11 -1 00E-11 -1 SOE-12 -1 00E-12 RHR CATS MEDIUM I 00E-04 I OOE-05 N LOW 1 00E-08 05 05 17 0 -17 0 0 0 0 RHR Total 9 -1 OE-09 -1 2E-10 -3 02.10 .3 4E.11 SI CAT2 HIGH 3 80E-03 1,10E-03 TASCS MEDIUM 2 00E-07 03 09 5 1 -4 4 56E-10 1 52E-09 1 32E-10 4 40E-10 SI CAT2 HIGH 3 80-E03 1 IOE-03 TT MEDIUM 2 00E-07 03 09 7 2 -5 228E-10 1 00E-09 660E-11 5 50E-10 SI CAT2 HIGH 3 80E-03 t.10E-03 TT, TASCS MEDIUM 2 00-E07 03 09 5 4 -1 -1 60E-09 3 BOE-10 -4 62E-10 1 10E-10 SI CAT4 HIGH 3 80E-03 1.10E-03 N LOW I OOE-08 05 05 28 22 -6 1 14E-10 1.14E-10 3 30E.11 330E-11 SI CATS MEDIUM 1 00E-04 1 00E-05 IGSCC MEDIUM 2 00.-07 05 05 0 2 2 -2 DE-1 1 -2 002-11 -2 00E-12 -2 00E-12 SI CATS MEDIUM 1 00E-04 I 00E-05 TT MEDIUM 2 00E-07 03 09 0 0 0 000E400 O00E200 0 00E+00 0 002400 SI CATS MEDIUM 1 00E-04 100E-05 TT, IGSCC MEDIUM 2 00E-07 03 09 0 1 1 -1 80E-11 -1 00-E11 -1 80E-12 -1 00E-12 SI CATS MEDIUM 1 00E-04 1 00E-05 N LOW 1 00E-08 05 05 45 0 -45 0 0 0 0 Si CAT7 LOW 1 00E-06 1 00E-07 N LOW 1 00E-08 05 05 3 0 -3 0 0 0 0 SI Total 32 -8 4E-10 3 9E-09 -2 3E-10 I IE-09 SP CAT4 HIGH 3 80E-03 1.102-03 N LOW I 00E-08 05 05 0 1 1 -1 90E-1L -1 90E-11 -5 50E-12 -5,50E-12 SP CAT6 MEDIUM 1 00E-04 1 00E-05 N LOW 1 00-E08 05 05 'I 0 -11 0 0 0 0 SP CAT7 LOW 1 00E-06 1 00E-07 N LOW 1 00E-08 05 05 0 0 0 0 0 0 0 SP Total _ 1 -1 9E-11 -1.9E-11 -55E-12 -5 5E-12 SW CATS (5) MEDIUM 1 00E-04 1 00E-05 NONE (MIC. PIT) LOW (MEDIUM) 1 DOE-08 05 05 5 0 -5 0 0 0 0 SWTotal 0 0 0E400 0 0E+00 0 02E00 0 02E00 Overall Change In Risk: 241 94 -8 6E-09 7 9E.09 -2 SE-09 2 3E-09 Page 1of I

( c (I A Bounding Estimate of the Risk Impact Based on the Upper Bound Failure Rates, Rev. 4 System Risk Consequence Upper Bound Failure Potential Upper Bound POD Inspections CDF Impact LERF Impact Category Rank CCDP CLERP Damage Mechanisms Rank Failure Rate before after Section XI RI-ISt Delta wIPOD wofPOD wIPOD Wo/POD CS CAT2 HIGH 3 80E-03 1.10E-03 IT MEDIUM 100E-05 03 09 0 6 6 -2 05E-07 -1.14E-07 -5 94E-08 -3 30E-08 Cs CAT2 HIGH 3 80E-03 1.10E-03 TT, TASCS MEDIUM I 00E-05 03 09 0 1 1 -3 42E-08 -1 90E-08 .9 90E-09 -5 50E-09 CS CAT4 HIGH 3 80E-03 1 10E-03 N LOW 1 OOE-06 05 05 0 2 2 -3 80E-09 -3 80E-09 -1.10E-09 -1.10E-09 CS CATS MEDIUM 100E-04 I OOE-05 TT MEDIUM 1 00E-05 03 09 0 1 1 -9 00E-10 -5 OOE.10 .9 00E-1 1 -5 00E-11 CS CATS MEDIUM 100E-04 I OOE-05 N LOW I OOE-06 05 05 16 0 -16 0 0 0 0 CS Total - 10 -2 4E-07 -1 4E-07 .7 0E-08 .4 0E-08 EF CAT2 HIGH 3 80E-03 I IOE-03 TT MEDIUM 100E-05 03 09 1 1 0 -2 28E-08 0 O0EO00 -6 60E-09 0 001+00 EF CAT4 HIGH 3 8OE-03 1.10E-03 N LOW I OOE406 05 05 2 1 -1 1 90E-09 I 90E-09 5 50E.10 5 50E-10 EF Total 2 .2 1E-08 1.9E-09 -6 1E-09 5 BE-10 FW CATS (3) MEDIUM 1 00E-04 1 00E-05 NONE (FAC) LOW I OOE-06 05 05 1 0 -1 0 0 0 0 FW CATS MEDIUM 1 OOE-04 1 OOE-05 TASCS MEDIUM 1 00E-05 03 09 1 1 0 .6 00E-10 0 00E+00 -6 00E.11 0 OOE+00 FW CATS MEDIUM 1 00E-04 I OOE-05 N LOW 1 00E-06 05 05 6 0 -6 0 0 0 0 FW Total 1 -60E-10 0 0E+00 -6 CE-11 0 0E+00 MS CATS MEDIUM 1 00E-04 I OOE-05 N LOW 1 00E-06 05 05 11 0 -11 0 0 0 0 MS Total 0 0OE+00 0 OE+00 0 08100 0 0E+00 RC CAT2 HIGH 3 80E-03 1 10E-03 PWSCC MEDIUM 100E-05 05 05 18 4 -14 2 66E-07 2 66E-07 7 702-08 7 70E-08 RC CAT2 HIGH 3 80E-03 1.102-03 TASCS MEDIUM I 00E-05 03 09 0 0 0 0 00.E00 000E+00 0 00+E00 0 00E100 RC CAT2 HIGH 3 80E-03 1.10E-03 TT MEDIUM 1 O0E-05 03 09 7 7 0 -1 COE-07 0 00E+00 -4 621-08 0 00E+00 RC CAT2 HIGH 3 BOE-03 1.10E-03 TT. PWSCC MEDIUM I 00E-05 03 09 4 2 -2 -2 28E-08 3 80E.08 -6 60E-09 1TOE-08 RC CAT2 HIGH 3 BOE-03 1.10E-03 TT. TASCS MEDIUM 100E-05 03 09 9 8 -1 -1 71E-07 1 902-08 -4 95E-08 5 50E-09 RC CAT4 HIGH 3 80E-03 I 10E-03 N LOW I 00E-06 05 05 37 18 -19 3 61E-08 3olE-08 1 052-08 1 05E-08 RC CATS MEDIUM 1 00E-04 1 00E-05 N LOW 100E-06 05 05 0 0 0 0 0 0 0 RC Total 39 -5 1E-08 3 2E-07 .1.5E-08 1 0E-07 RHR CAT2 HIGH 3 80E-03 1.10E-03 TASCS MEDIUM 100E-05 03 09 2 2 0 -4 56E-08 0 002E00 -1 32E-08 0 OE+00 RHR CAT4 HIGH 3 80E-03 1.10E-03 N LOW I OOE-06 05 05 0 6 6 .1 14E.08 -1.14E-08 -3 30E-09 -330E-09 RHR CAT5 MEDIUM I 00E-04 1 OOE-05 TASCS MEDIUM 1 00E-05 03 09 0 1 1 -9 00E-10 -500E.10 -9 00E-11 -500E-I1 RHR CATS MEDIUM I OOE-04 O00E-O5 N LOW I OOE-06 05 05 17 0 -17 0 0 0 0 RHR Total 9 -5 BE-08 -1 2E.08 -1,7E-08 -3 4E-09 SI CAT2 HIGH 3 80E-03 1.10E-03 TASCS MEDIUM 1 OQE-05 03 09 5 1 -4 2 28E-08 7 60E-08 6 60E-09 2 20E-08 SI CAT2 HIGH 3 BOE-03 .102E-03 TT MEDIUM I OOE-05 03 09 7 2 -5 1 14E-08 9 50E-08 3 30E-09 2 75E-08 SI CAT2 HIGH 3 BOE-03 1.10E-03 TiT, TASCS MEDIUM I 00E-05 03 09 5 4 -1 -7 98E-08 1 BCE-08 -2 31E-08 5 50E-09 SI CAT4 HIGH 3 80E-03 1,10E-03 N LOW IOOE-06 05 05 28 22 -6 1.14E-08 I 14E-08 3 30E-09 3 302-09 SI CATS MEDIUM 100E-04 1 00E-05 IGSCC MEDIUM I 00E-05 05 05 0 2 2 -1 OOE-09 -1 00E-09 -,001E-10 -100E-10 SI CATS MEDIUM 1 00E-04 1 00E-05 "TT =.. MEDIUM I OOE-05 03 09 0 0 0 '0 00E+00 0000.00 0000+00 0 00+E00 SI CAT5 MEDIUM 1 00E-04 IOOE-05 TT. IGSCC MEDIUM I OOE-05 03 09 0 1 1 -900E-10 -5 OOE-10 -900E-11 -5 00E-11 SI CATS MEDIUM 1 00E-04 I OOE-05 N LOW 1 00E-06 05 05 45 0 -45 0 0 0 0 SI CAT7 LOW 1 00E-06 1 00E-07 N LOW I 00E-06 05 05 3 0 -3 0 0 0 0 SI Total 32 -3 6E-08 2 0E-07 -1.OE-08 5 BE-08 SP CAT4 HIGH 3 80E-03 1.102-03 N LOW I 0CE-06 05 05 0 1 1 -1 90E-09 -190E-09 -5 50E-10 -5 50E-10 SP CATS MEDIUM 1 00E-04 1 00E-05 N LOW I O0E-06 05 05 11 0 -11 0 0 0 0 SP CAT7 LOW 100E-06 1 00E-07 N LOW I OOE-06 05 05 0 0 0 0 0 0 0 SP Total I I 1 .1 BE-09 -1 9E-09 -5 5E-10 -5 5E-10 SW CAT6(5) MEDIUM 1 00E-04 1 OE-05 NONE (MIC, PIT) LOW (MEDIUM) I OCE-06 05 05 5 0 -5 0 0 0 0 SW Total _ 0 0 0Me00 070800 0 0E0+0 0 02E00 Grand Total 241 94 -4 1E-07 4 1E-07 .1 2E-C7 1 2E-07 Page I of I

C (

TEMPLATE: TABLE 3.6 -1 Risk Consequence Failure Potential Inspections CDF Impact LERF Impact System Category Rank Damage Mechanisms Rank Section XI RI-ISI Delta w/POD wo/POD w/POD woIPOD CS CAT2 HIGH TT MEDIUM 0 6 6 -4.10E-09 -2.28E-09 -1.19E-09 -6.60E-10 CS CAT2 HIGH TT, TASCS MEDIUM 0 1 1 -6.84E-10 -3.80E-10 -1.98E-10 -1.10E-10 CS CAT4 HIGH N LOW 0 2 2 -3.80E-11 -3.80E-11 -1.10E-11 -1.10E-11 CS CAT5 MEDIUM TT MEDIUM 0 1 1 -1 80E-11 -1.00E-11 -1 80E-12 -1 00E-12 CS CAT6 MEDIUM N LOW 16 0 -16 negligible negligible negligible negligible CS Total 10 -4.84E-09 -2.71E-09 -1.40E-09 -7.82E-10 EF CAT2 HIGH IT MEDIUM 1 1 0 -4.56E-10 no change -1.32E-10 no change EF CAT4 HIGH N LOW 2 1 -1 1.90E-11 1.90E-11 5.50E-12 5.50E-12 EF Total 2 -4.37E-10 1.90E-11 -1.27E-10 5.50E-12 FW CAT6 (3) MEDIUM NONE (FAC) LOW 1 0 -1 negligible negligible negligible negligible FW CAT5 MEDIUM TASCS MEDIUM 1 1 0 -1.20E-11 no change -1.20E-12 no change FW CAT6 MEDIUM N LOW 6 0 .6 negligible negligible negligible negligible FW Total I -1.20E-11 negligible -1.20E-12 negligible MS CAT6 MEDIUM N LOW 11 0 -11 negligible negligible negligible negligible MS Total 0 negligible negligible negligible negligible RC CAT2 HIGH PWSCC MEDIUM 18 4 -14 5.32E-09 5 32E-09 1.54E-09 1.54E-09 RC CAT2 HIGH TASCS MEDIUM 0 0 0 no change no change no change no change RC CAT2 HIGH TT MEDIUM 7 7 0 -3.19E-09 no change -9.24E-10 no change RC CAT2 HIGH TT, PWSCC MEDIUM 4 2 .2 -4.56E-10 7.60E-10 -1.32E-10 2.20E-10 RC CAT2 HIGH TT, TASCS MEDIUM 9 a -1 -3.42E-09 3.80E-10 -9 90E-10 1.10E-10 RC CAT4 HIGH N LOW 37 18 -19 3.61E-10 3.61E-10 1.05E-10 1.052-10 RC CAT6 MEDIUM N LOW 0 0 0 no change no change no change no change RC Total 39 -1.39E-09 6.82E-09 -4.02E-10 1.97E-09 RHR CAT2 HIGH TASCS MEDIUM 2 2 0 -9.12E-10 no change -2.64E-10 no change RHR CAT4 HIGH N LOW 0 6 6 -1.14E-10 -1.14E-10 -3.30E-11 -3.30E-11 RHR CAT5 MEDIUM TASCS MEDIUM 0 1 1 -1.80E-11 -1.00E-11 -1.80E-12 -1.00-E12 RHR CAT6 MEDIUM N LOW 17 0 -17 negligible negligible negligible negligible RHR Total 9 .1.04E-09 -1.24E-10 -2.99E-10 -3.40E-11 SI CAT2 HIGH TASCS MEDIUM 5 1 -4 4.56E-10 1.52E-09 1.32E-10 4.40E-10 SI CAT2 HIGH TI MEDIUM 7 2 -5 2.28E-10 1.90E-09 6 60E-11 5 50E-10 SI CAT2 HIGH TT, TASCS MEDIUM 5 4 -1 -1.60E-09 3.80E-10 -4 62E-10 1.102-10 SI CAT4 HIGH N LOW 28 22 -6 1.14E-10 1.14E-10 3 30E-11 3 30E-11 SI CAT5 MEDIUM IGSCC MEDIUM 0 2 2 -2.00E-11 -2.OOE-11 -2.00E-12 -2.00E-12 SI CAT5 MEDIUM TT MEDIUM 0 0 0 no change no change no change no change SI CATS MEDIUM TT, IGSCC MEDIUM 0 1 1 -1.80E-11 -1 OOE-11 -1.80E-12 -1.00E-12 SI CAT6 MEDIUM N LOW 45 0 -45 negligible negligible negligible negligible SI CAT7 LOW N LOW 3 0 -3 negligible negligible negligible negligible SI Total 32 -8.36E-10 3.88E-09 -2.35E-10 1.13E-09 SP CAT4 HIGH N LOW 0 1 1 -1.90E-11 -1.90E-11 -5 50E-12 -5.50E-12 SP CAT6 MEDIUM N LOW 11 0 -11 negligible negligible negligible negligible SP CAT7 LOW N LOW 0 0 0 no change no change no change no change SP Total I I -1.90E-11 -1.90E-11 -5.50E-12 -5.50E-12 SW CAT6 (5) MEDIUM NONE (MIC, PIT) LOW (MEDIUM) 5 0 -5 negligible negligible negligible negligible SW Total 0 neglhgible negligible negligible negligible Overall Change In Risk: 241 94 -8.58E-09 7.87E-09 -2.47E-09 2.29E-09 Page 1 of I

C C Risk Impact Inputs Consequence Upper Bound Failure Potential Best Estimate Upper Bound POD Rank CCoP j CLERP Damage Mechanisms Rank Fallure Rate Failure Rate before after High 3 80E-03 1.10E-03 FAC High 2 OOE-06 1 00E-04 N/A N/A TASCS,"1 03 09 Medium 1.00E-04 1.00E-05 Medium 2.OOE-07 1 00E-05 IGSCC, TGSCC, PWSCC.

ECSCC. MIC, PIT, CC, E-C 05 05 Low 1.OOE-06 1.00E-07 None Low 1 OOE-08 I OOE-06 05 05 Page I of 1

RISK-INFORMED INSERVICE INSPECTION PROGRAM PLAN V. C. SUMMER NUCLEAR STATION, REVISION 0 Table of Contents

1. Introduction 1.1 Relation to NRC Regulatory Guides 1.174 and 1.178 1.2 PSA Quality

2. Proposed Alternative to Current Inservice Inspection Programs 2.1 ASME Section XI 2.2 Augmented Programs

3. Risk-Informed ISI Process 3.1 Scope of Program 3.2 Consequence Evaluation 3.3 Failure Potential Assessment 3.4 Risk Characterization 3.5 Element and NDE Selection 3.5.1 Additional Examinations 3.5.2 Program Relief Requests 3.6 Risk Impact Assessment 3.6.1 Quantitative Analysis 3.6.2 Defense-in-Depth

4. Implementation and Monitoring Program

5. Proposed ISI Program Plan Change

6. References/Documentation 1 of 24

1. INTRODUCTION The V. C. Summer Nuclear Station (VCSNS) is currently in the second inservice inspection (ISI) interval as defined by the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Section XI Code for Inspection Program B. VCSNS plans to implement a risk informed inservice inspection (RI-ISI) program in the third inspection period. Pursuant to 10 CFR 50.55a(g)(4)(ii), the applicable ASME Section XI Code for the second interval at VCSNS is the 1989 Edition, no Addenda.

The objective of this submittal is to request the use of a risk-informed process for the inservice inspection of Class 1 and 2 piping. The RI-ISI process used in this submittal is described in Electric Power Research Institute (EPRI) Topical Report (TR) 112657 Rev. B-A "Revised Risk Informed Inservice Inspection Evaluation Procedure." The RI-ISI application was also conducted in a manner consistent with ASME Code Case N-578 "Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method B."

1.1 Relation to NRC Regulatory Guides 1.174 and 1.178 As a risk-informed application, this submittal meets the intent and principles of Regulatory Guide 1.174, "An Approach for Using Probabilistic Risk Assessment in Risk Informed Decisions On Plant-Specific Changes to the Licensing Basis" and Regulatory Guide 1.178, "An Approach for Plant-Specific Risk-informed Decisionmaking Inservice Inspection of Piping". Further information is provided in Section 3.6.2 relative to defense-in-depth.

1.2 PSA Quality The VCSNS Independent Plant Examination (IPE) was produced by a team of South Carolina Electric and Gas (SCE&G), Westinghouse, and Fauske and Associates, Inc.

(FAI) personnel, and completed in June 1993. A SCE&G review process was established early in the IPE project, with continuous feedback used to capture the as operated plant in the modeling. Four different independent reviews were performed during the IPE study. The first two were structured to meet the Independent Review (IR) requirements of Generic Letter 88-20. In addition to the Generic Letter IR review requirement, a human error analyst from Science Applications International Corporation (SAIC) performed a review of the human reliability analysis. Also, SCE&G employed a Probabilistic Risk Assessment (PRA) analyst from SAIC to review all aspects of the Level 1 analysis.

As a result of the IPE process, VCSNS identified several plant improvement opportunities that have been implemented. These include elimination of the Charging /

Safety Injection Pump Chilled Water Dependency, proceduralizing the use of alternate cooling sources, and changes to emergency operating procedures.

The NRC Staff Evaluation Report on the VCSNS IPE was issued in May 1997. Although the NRC review concurred that the VCSNS IPE met the intent of Generic Letter 88-20, the review did note that "miscalibration events" were not explicitly modeled in the analysis of pre-initiators in the human actions. Subsequently, the VCSNS PRA human reliability analysis has been reviewed. The potential for instrument calibration error has been evaluated and determined to be minimal based on a list of calibration practices.

Page 2 of 24

The version of the VCSNS PRA model (3EUP.CAF) used to conduct the RI-ISI analysis calculated a core damage frequency (CDF) for internal events of 5.6E-05/year. The largest contributor to CDF, with a 70.5% contribution, is loss-of-offsite-power/station blackout events. Other non-LOCA transient initiators contribute approximately 13% of the CDF. Special initiators (loss of support systems) contribute approximately 10% to CDF, primadly due to loss of service water and loss of chilled water. Both of these lead to reactor coolant pump seal failure LOCAs. LOCAs contribute approximately 4% to the CDF.

The Level 2 analysis calculated that given core damage, the conditional probability of late containment failure is 21%. No containment overpressure failures were found to occur within the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The large early release frequency (LERF) was calculated to be 7.OE-07/year.

Since the issuance of the VCSNS IPE, the PRA model and documentation have been updated and were used in the RI-ISI evaluation. The revised PRA model received an independent review by personnel from Westinghouse that was completed on MIlarch 22, 2001. The purpose of this review was to:

"* aid SCE&G in defining tasks to prepare the PRA for use in plant risk-informed applications, and

"* support an upcoming Westinghouse Owners Group (WOG) PRA Peer Review Strengths identified during this review included:

"* the PRA is being actively maintained and upgraded to better reflect plant configurations and procedure changes

" a single integrated PRA model that supports PRA applications by the PRA group and "real time" assessments (e.g., Equipment Out Of Service) by plant staff exists which also allows the use of very low truncation values to ensure that all important modeled contributors are accounted for Areas for improvement identified during this review included:

• the use of more recent generic and plant specific initiating event frequencies Note - this should not have an impact on the RI-ISI results as the EPRI RI-ISI process for responding to pipe breaks that cause an initiating event is based upon conditional values for initiating event contribution and therefore will not change if the frequencies are updated

• better documentation of the fault tree development process, including the results of the model review process Note - this should not impact the results of the RI-ISI process

• modeling of several scenarios for the Steam Generator Tube Rupture and Interfacing System LOCA events could be improved Page 3 of 24

Note - while better modeling would improve the ease of use of the PRA, this should not impact the RI-ISI results

• more recent data and common cause information should be incorporated into the updated model for special initiators such as a total loss of service water Note - as the RI-ISI evaluation only postulated single train losses of service water, this comment should have no impact In summary, this independent review concluded that the VCSNS PRA is generally suitable for risk-informed applications. While enhancement opportunities were noted, this review provided VCSNS staff an opportunity to better prepare for the upcoming WOG PRA peer review scheduled for August 2002.

2. PROPOSED ALTERNATIVE TO CURRENT ISI PROGRAM REQUIREMENTS 2.1 ASME Section XI ASME Section XI Examination Categories B-F, B-J, C-F-1 and C-F-2 currently contain the requirements for the nondestructive examination (NDE) of Class 1 and 2 piping components. The alternative RI-ISI program for piping is described in EPRI TR-112657.

The RI-ISI program will be substituted for the current program for Class 1 and 2 piping (Examination Categories B-F, B-J, C-F-1 and C-F-2) in accordance with 10 CFR 50.55a(a)(3)(i) by alternatively providing an acceptable level of quality and safety. Other non-related portions of the ASME Section XI Code will be unaffected. EPRI TR- 12657 provides the requirements for defining the relationship between the RI-ISI program and the remaining unaffected portions of ASME Section XI.

2.2 Augmented Programs The following augmented inspection programs were considered during the RI-ISI application:

"* The augmented inspection program for flow accelerated corrosion (FAC) per Generic Letter 89-08 is relied upon to manage this damage mechanism but is not otherwise affected or changed by the RI-ISI program.

" The augmented inspection program for the service water intake and piping is addressed in Procedure ES-505, "Service Water System Corrosion Monitoring and Control Program." This procedure is relied upon to manage this damage mechanism (i.e., Microbiologically Influenced Corrosion (MIC) and Pitting (PIT)) but it is not otherwise affected or changed by the RI-ISI program.

Page 4 of 24

3. RISK-INFORMED ISI PROCESS The process used to develop the RI-ISI program conformed to the methodology described in EPRI TR-1 12657 and consisted of the following steps:

• Scope Definition

• Consequence Evaluation

• Failure Potential Assessment

• Risk Characterization

• Element and NDE Selection

• Risk Impact Assessment

• Implementation Program

• Feedback Loop A deviation to the EPRI RI-ISI methodology has been implemented in the failure potential assessment for V. C. Summer. Table 3-16 of EPRI TR-1 12657 contains criteria for assessing the potential for thermal stratification, cycling and striping (TASCS). Key attributes for horizontal or slightly sloped piping greater than 1" nominal pipe size (NPS) include:

1. Potential exists for low flow in a pipe section connected to a component allowing mixing of hot and cold fluids, or

2. Potential exists for leakage flow past a valve, including in-leakage, out-leakage and cross-leakage allowing mixing of hot and cold fluids, or

3. Potential exists for convective heating in dead-ended pipe sections connected to a source of hot fluid, or

4. Potential exists for two phase (steam/water) flow, or

5. Potential exists for turbulent penetration into a relatively colder branch pipe connected to header piping containing hot fluid with turbulent flow, AND AT > 501F, AND Richardson Number> 4 (this value predicts the potentialbuoyancy of a stratifiedflow)

These criteria, based on meeting a high cycle fatigue endurance limit with the actual AT assumed equal to the greatest potential AT for the transient, will identify all locations where stratification is likely to occur, but allows for no assessment of severity. As such, many locations will be identified as subject to TASCS where no significant potential for thermal fatigue exists. The critical attribute missing from the existing methodology that would allow consideration of fatigue severity is a criterion that addresses the potential for fluid cycling. The impact of this additional consideration on the existing TASCS susceptibility criteria is presented below.

Page 5 of 24

> Turbulent penetration TASCS Turbulent penetration typically occurs in lines connected to piping containing hot flowing fluid. In the case of downward sloping lines that then turn horizontal, significant top-to bottom cyclic ATs can develop in the horizontal sections if the horizontal section is less than about 25 pipe diameters from the reactor coolant piping. Therefore, TASCS is considered for this configuration.

For upward sloping branch lines connected to the hot fluid source that turn horizontal or in horizontal branch lines, natural convective effects combined with effects of turbulence penetration will keep the line filled with hot water. If there is no potential for in-leakage towards the hot fluid source from the outboard end of the line, this will result in a well mixed fluid condition where significant top-to-bottom ATs will not occur. Therefore TASCS is not considered for these configurations. Even in fairly long lines, where some heat loss from the outside of the piping will tend to occur and some fluid stratification may be present, there is no significant potential for cycling as has been observed for the in-leakage case, The effect of TASCS will not be significant under these conditions and can be neglected.'

>* Low flow TASCS In some situations, the transient startup of a system (e.g., RHR suction piping) creates the potential for fluid stratification as flow is established. In cases where no cold fluid source exists, the hot flowing fluid will fairly rapidly displace the cold fluid in stagnant lines, while fluid mixing will occur in the piping further removed from the hot source and stratified conditions will exist only briefly as the line fills with hot fluid. As such, since the situation is transient in nature, it can be assumed that the criteria for thermal transients (TT) will govern.

>. Valve leakage TASCS Sometimes a very small leakage flow of hot water can occur outward past a valve into a line that is relatively colder, creating a significant temperature difference. However, since this is a generally a "steady-state" phenomenon with no potential for cyclic temperature changes, the effect of TASCS is not significant and can be neglected.

>. Convection heating TASCS Similarly, there sometimes exists the potential for heat transfer across a valve to an isolated section beyond the valve, resulting in fluid stratification due to natural convection. However, since there is no potential for cyclic temperature changes in this case, the effect of TASCS is not significant and can be neglected.

In summary, these additional considerations for determining the potential for thermal fatigue as a result of the effects of TASCS provide an allowance for the consideration of cycle severity in assessing the potential for TASCS effects. The above criteria have previously been submitted by EPRI for generic approval (Letter dated February 28, 2001, P.J. O'Regan (EPRI) to Dr. B.

Sheron (USNRC), "Extension of Risk-Informed Inservice Inspection Methodology").

Page 6 of 24

3.1 Scope of Program The systems included in the RI-ISI program are provided in Table 3.1. The piping and instrumentation diagrams and additional plant information including the existing plant ISI program were used to define the Class 1 and 2 piping system boundaries.

3.2 Consequence Evaluation The consequence(s) of pressure boundary failures were evaluated and ranked based on their impact on core damage and containment performance (i.e., isolation, bypass and large early release). The consequence evaluation included an assessment of shutdown and external events. The impact on these measures due to both direct and indirect effects was considered using the guidance provided in EPRI TR-1 12657.

3.3 Failure Potential Assessment Failure potential estimates were generated utilizing industry failure history, plant specific failure history, and other relevant information.- These failure estimates were d6termined using the guidance provided in EPRI TR-1 12657, with the exception of the previously stated deviation.

Table 3.3 summarizes the failure potential assessment by system for each degradation mechanism that was identified as potentially operative.

3.4 Risk Characterization In the preceding steps, each run of piping within the scope of the program was evaluated to determine its impact on core damage and containment performance (i.e., isolation, bypass and large, early release) as well as its potential for failure. Given the results of these steps, piping segments are then defined as continuous runs of piping potentially susceptible to the same type(s) of degradation and whose failure will result in similar consequence(s). Segments are then ranked based upon their risk significance as defined in EPRI TR-1 12657.

The results of these calculations are presented in Table 3.4.

3.5 Element and NDE Selection In general, EPRI TR-112657 requires that 25% of the locations in the high risk region and 10% of the locations in the medium risk region be selected for inspection using appropriate NDE methods tailored to the applicable degradation mechanism. In addition, per Section 3.6.4.2 of EPRI TR-1 12657, if the percentage of Class 1 piping locations selected for examination falls substantially below 10%, then the basis for selection needs to be investigated. As depicted below, the percentage of Class 1 welds selected for examination per the RI-ISI process is greater than 10% for V. C. Summer. It should be noted that the 10% figure was achieved based on welds that are subject to volumetric examination rather than just a VT-2 visual examination. In addition, no credit was taken for any FAC augmented inspection program locations beyond those selected by the RI-ISI process to meet the sampling percentage requirements.

Page 7 of 24

A brief summary is provided in the following table, and the results of the selections are presented in Table 3.5. Section 4 of EPRI TR-1 12657 was used as guidance in determining the examination requirements for these locations.

2 Class I Piping Welds(1) Class 2 Piping Welds( 1 All Piping Welds13)

U n itT Total Selected Total Selected oa Total Selected 1 761 77 1542 17 2303 94 Notes

1. Includes all Category B-F and B-J locations.

2. Includes all Category C-F-1 and C-F-2 locations.

3. All in-scope piping components, regardless of risk classification, will continue to receive Code required pressure testing, as part of the current ASME Section XI program. V17-2 visual examinations are scheduled in accordance with the station's pressure test program that remains unaffected by the RI-ISI program.

3.5.1 Additional Examinations The RI-ISI program in all cases will determine through an engineering evaluation the root cause of any unacceptable flaw or relevant condition found during examination. The evaluation will include the applicable service conditions and degradation mechanisms to establish that the element(s) will still perform their intended safety function during subsequent operation. Elements not meeting this requirement will be repaired or replaced.

The evaluation will include whether other elements in the segment or additional segments are subject to the same root cause conditions. Additional examinations will be performed on those elements with the same root cause conditions or degradation mechanisms. The additional examinations will include high risk significant elements and medium risk significant elements, if needed, up to a number equivalent to the number of elements required to be inspected on the segment or segments during the current outage. If unacceptable flaws or relevant conditions are again found similar to the initial problem, the remaining elements identified as susceptible will be examined. No additional examinations will be performed if there are no additional elements identified as being susceptible to the same root cause conditions.

3.5.2 Program Relief Requests An attempt has been made to select RI-ISI locations for examination such that a minimum of >90% coverage (i.e., Code Case N-460 criteria) is attainable.

However, some limitations will not be known until the examination is performed, since some locations may be examined for the first time by the specified techniques.

In instances where locations are found at the time of the examination that do not meet the >90% coverage requirement, the process outlined in EPRI TR-112657 will be followed.

None of the existing VCSNS relief requests are being withdrawn due to the RI-ISI application.

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3.6 Risk Impact Assessment The RI-ISI program has been conducted in accordance with Regulatory Guide 1.174 and the requirements of EPRI TR-1 12657, and the risk from implementation of this program is expected to remain neutral or decrease when compared to that estimated from current requirements.

This evaluation identified the allocation of segments into High, Medium, and Low risk regions of the EPRI TR-1 12657 and ASME Code Case N-578 risk ranking matrix, and then determined for each of these risk classes what inspection changes are proposed for each of the locations in each segment. The changes include changing the number and location of inspections within the segment and in many cases improving the effectiveness of the inspection to account for the findings of the RI-ISI degradation mechanism assessment. For example, for locations subject to thermal fatigue, examinations will be conducted on an expanded volume and will be focused to enhance the probability of detebtion (POD) during the inspection process.

3.6.1 Quantitative Analysis Limits are imposed by the EPRI methodology to ensure that the change in risk of implementing the RI-ISI program meets the requirements of Regulatory Guides 1.174 and 1.178. The EPRI criterion requires that the cumulative change in core damage frequency (CDF) and large early release frequency (LERF) be less than 1E-07 and 1 E-08 per year per system, respectively.

V. C. Summer conducted a risk impact analysis per the requirements of Section 3.7 of EPRI TR-1 12657. The analysis estimates the net change in risk due to the positive and negative influence of adding and removing locations from the inspection program. A risk quantification was performed using the "Simplified Risk Quantification Method" described in Section 3.7 of EPRI TR-1 12657. The conditional core damage probability (CCDP) and conditional large early release probability (CLERP) used for high consequence category segments was based on the highest evaluated CCDP (3.8E-03) and CLERP (1.1E-03), whereas, for medium consequence category segments, bounding estimates of CCDP (1E-04) and CLERP (1E-05) were used. The likelihood of pressure boundary failure (PBF) is determined by the presence of different degradation mechanisms and the rank is based on the relative failure probability. The basic likelihood of PBF for a piping location with no degradation mechanism present is given as Xo and is expected to have a value less than 1E-08. Piping locations identified as medium failure potential have a likelihood of 20xo. These PBF likelihoods are consistent with References 9 and 14 of EPRI TR-112657. In addition, the analysis was performed both with and without taking credit for enhanced inspection effectiveness due to an increased POD from application of the RI-ISI approach.

Table 3.6-1 presents a summary of the RI-ISI program versus 1989 ASME Section X1 Code Edition program requirements and identifies on a per system basis each applicable risk category. The presence of FAC and MIC/PIT was adjusted for in the performance of the quantitative analysis by excluding its impact on the risk ranking. However, in an effort to be as informative as possible, for those systems where FAC or MIC/PIT is present, Table 3.6-1 Page 9 of 24

presents the information in such a manner as to depict what the resultant risk categorization is both with and without consideration of FAC or MIC/PIT. This is accomplished by enclosing the FAC or MIC/PIT damage mechanism, as well as all other resultant corresponding changes (failure potential rank, risk category and risk rank), in parentheses. Again, this has only been done for information purposes, and has no impact on the assessment itself. The use of this approach to depict the impact of degradation mechanisms managed by augmented inspection programs on the risk categorization is consistent with that used in the delta risk assessment for the Arkansas Nuclear One, Unit 2 (ANO-2) pilot application. An example is provided below.

Risk Consequence Failure Potential Categorym Rank") Rank DMs Rank In this example if FAC is not considered, the failure potential rank is "medium" instead of "high" based on the TASCS and TT damage mechanisms. When a "medium" failure potential rank is combined with a "medium" consequence rank, it results in risk category 5 ("medium" risk) being assigned instead of risk category 3 ("high" risk).

FW , 5(3) Medium (High) Medium - TASCS, iT, (FAC)

• I In this example if FAC were considered, the failure potential rank would be "high" instead of "medium". If a "high" failure potential rank were combined with a "medium" consequence rank, it would result in risk category 3 ("high" risk) being assigned instead of risk category 5 ("medium" risk).

Note

1. The risk rank is not included in Table 3.6-1 but it is included in Table 5-2.

As indicated in the following table, this evaluation has demonstrated that unacceptable risk impacts will not occur from implementation of the RI-ISI program, and satisfies the acceptance criteria of Regulatory Guide 1.174 and EPRI TR-1 12657.

Page 10 of 24

Risk Impact Results System(1 ) 1 WI POD ARiSkCDF w wio POD J w/POD ARiskLERF w1 w/o POD RC -1.39E-09 6.82E-09 -4.02E-10 1.97E-09 RHR -1.04E-09 -1.24E-10 -2.99E-10 -3.40E-11 SI -8.36E-10 3.88E-09 -2.35E-10 1.13E-09 CS -4.84E-09 -2.71 E-09 -1.40E-09 -7.82E-10 SP -1.90E-11 -1.90E-11 -5.50E-12 -5.50E-12 MS negligible negligible negligible negligible FW -1.20E-11 negligible -1.20E-12 negligible EF -4.37E-10 1.90E-11 -1.27E-10 5.50E-12 SW negligible negligible negligible negligible Total -8.58E-09 7.87E-09 -2.47E-09 2.29E.09 Note

1. Systems are described in Table 3.1.

3.6.2 Defense-in-Depth The intent of the inspections mandated by ASME Section XI for piping welds is to identify conditions such as flaws or indications that may be precursors to leaks or ruptures in a system's pressure boundary. Currently, the process for picking inspection locations is based upon structural discontinuity and stress analysis results. As depicted in ASME White Paper 92-01-01 Rev. 1, "Evaluation of Inservice Inspection Requirements for Class 1, Category B-J Pressure Retaining Welds," this method has been ineffective in identifying leaks or failures. EPRI TR-1 12657 and Code Case N-578 provide a more robust selection process founded on actual service experience with nuclear plant piping failure data.

This process has two key independent ingredients, that is, a determination of each location's susceptibility to degradation and secondly, an independent assessment of the consequence of the piping failure. These two ingredients assure defense in depth is maintained. First, by evaluating a location's susceptibility to degradation, the likelihood of finding flaws or indications that may be precursors to leak or ruptures is increased. Secondly, the consequence assessment effort has a single failure criterion. As such, no matter how unlikely a failure scenario is, it is ranked High in the consequence assessment, and at worst Medium in the risk assessment (i.e., Risk Category 4), if as a result of the failure there is no mitigative equipment available to respond to the event. In addition, the consequence assessment takes into account equipment reliability, and less credit is given to less reliable equipment.

All locations within the Class 1 and 2 pressure boundaries will continue to receive a system pressure test and visual VT-2 examination as currently required by the Code regardless of its risk classification.

Page 11 of 24

4. IMPLEMENTATION AND MONITORING PROGRAM Upon approval of the RI-ISI program, procedures that comply with the guidelines described in EPRI TR-1 12657 will be prepared to implement and monitor the program. The new program will be integrated into the second inservice inspection interval. No changes to the Technical Specifications or Final Safety Analysis Report are necessary for program implementation.

The applicable aspects of the ASME Code not affected by this change will be retained, such as inspection methods, acceptance guidelines, pressure testing, corrective measures, documentation requirements, and quality control requirements. Existing ASME Section XI program implementing procedures will be retained and modified to address the RI-ISI process, as appropriate.

The monitoring and corrective action program will contain the following elements:

A. Identify B. Characterize C. (1) Evaluate, determine the cause and extent of the condition identified (2) Evaluate, develop a corrective action plan or plans D. Decide E. Implement F. Monitor G. Trend The RI-ISI program is a living program requiring feedback of new relevant information to ensure the appropriate identification of high safety significant piping locations. As a minimum, piping segments will be reviewed and Risk Ranking adjusted as necessary on an ASME period basis.

In addition, significant RI-ISI Program changes may require more frequent adjustment as directed by NRC Bulletin or Generic Letter requirements, or by industry and plant specific feedback.

5. PROPOSED ISI PROGRAM PLAN CHANGE A comparison between the RI-ISI program and ASME Section XI Code 1989 Edition program requirements for in-scope piping is provided in Tables 5-1 and 5-2. Table 5-1 provides summary comparisons by risk region. Table 5-2 provides the same comparison information, but in a more detailed manner by risk category, similar to the format used in Table 3.6-1.

VCSNS is currently in the third period of its second inspection interval. Up until this point, 64.5% of Examination Category B-F, B-J, C-F-I, and C-F-2 welds have been completed.

Beginning in the first refueling outage of the third period of the second interval, the examinations determined by the RI-ISI process will replace those formerly selected per ASME Section XI criteria. Since 64.5% of the examinations have been completed thus far in the second interval, 35.5% of the RI-ISI examinations will be performed during the remaining refueling outages in the third period. Subsequent ISI intervals will implement 100% of the examination locations selected per the RI-ISI program. Examinations shall be performed during the interval such that the period examination percentage requirements of ASME Section Xl, paragraphs IWB-2412 and IWC-2412 are met.

Page 12 of 24

6. REFERENCES/DOCUMENTATION EPRI TR-112657, "Revised Risk-Informed Inservice Inspection Evaluation Procedure", Rev. B-A ASME Code Case N-578, "Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method B,Section XI, Division 1" Regulatory Guide 1.174, "An Approach for Using Probabilistic Risk Assessment in Risk Informed Decisions On Plant-Specific Changes to the Licensing Basis" Regulatory Guide 1.178, "An Approach for Plant-Specific Risk-Informed Decisionmaking Inservice Inspection of Piping" Supporting Onsite Documentation "Risk-Informed Inservice Inspection Consequence Evaluation of Class 1 & 2 Pipirig, V. C.

Summer Nuclear Station," Revision 1 Structural Integrity Calculation No. EPRI-1 56-330, "Degradation Mechanism Evaluation for the Class 1 (Category B-J / B-F) Piping at the Virgil C. Summer Nuclear Station (VCSNS)," Revision 1

Structural Integrity Calculation No. EPRI-156-331, "Degradation Mechanism Evaluation for the Class 2 (Category C-F-1 / C-F-2) Piping at the Virgil C. Summer Nuclear Station (VCSNS),"

Revision 0 "Risk Ranking Summary, Matrix and Report for the V. C. Summer Nuclear Station," Revision I "V. C. Summer Risk-Informed ISI Delta Risk Analysis," Revision 4 Page 13 of 24

( (. (

Table 3.1 System Selection and Segment I Element Definition System Description Number of Segments Number of Elements RC - Reactor Coolant 66 262 RHR - Residual Heat Removal 37 301 SI - Safety Injection 128 824 CS - Chemical and Volume Control 62 409 SP - Reactor Building Spray 34 247 MS - Main Steam 32 143 FW - Feedwater 28 74 EF - Emergency Feedwater 6 8 SW - Service Water 6 35 Totals 399 2303 Page 14 of 24

C C (7 Table 3.3 Failure Potential Assessment Summary Stress Corrosion Cracking Localized Corrosion Flow Sensitive System~'1 Thermal Fatigue TASCS TT IGSCC TGSCC ECSCC PWSCC MIC PIT CC E-C FAC RC X X x RHR X X Si X X X CS X X SP MS FW X x EF X SW x x Note

1. Systems are described inTable 3.1.

Page 15 of 24

C (7 C Table 3.4 Number of Segments by Risk Category With and Without Impact of FAC and MICIPIT High Risk Region Medium Risk Region Low Risk Region System(l) Category I Category 2 Category 3 Category 4 Category 5 Category 6 Category 7 With Without With Without With Without With Without With Without With Without With Without RC 29 29 34 34 3 3 RHR 3 3 7 7 2 2 25 25 SI 12 12 29 29 17 17 66 66 4 4 CS 7 7 2 2 3 3 50 50 SP 2 2 29 29 3 3 MS 32 32 FW 10(2) 0 3 3 15 25 EF 3 3 3 3 SW 6_(3) 0 0 6 Total 54 54 10 0 77 77 25 25 226 236 7 7 Notes

1. Systems are described in Table 3.1.

2. These ten segments become Category 6 after FAC is removed from consideration due to no other damage mechanisms being present.

3. These six segments become Category 6 after MICIPIT is removed from consideration due to no other damage mechanisms being present.

Page 16 of 24

( ( C Table 3.5 Number of Elements Selected for Inspection by Risk Category Excluding Impact of FAC and MICIPIT High Risk Region Medium Risk Region Low Risk Region System(l) Category I Category 2 Category 3 Category 4 Category 5 Category 6 Category 7 Total JSelected Total Selected Total Selected Total Selected Total Selected Total Selected Total Selected RC 83 21 172 18 7 0 RHR 5 2 53 6 6 1 237 0 SI 28 7 215 22 30 3 518 0 33 0 CS 25 7 11 2 4 1 369 0 SP 7 1 226 0 14 0 MS 143 0 FW 7 1 67 0 EF 3 1 5 1 SW 35 0_

Total 144 38 463 50 47 6 1631 0 18 0 Notes

1. Systems are described inTable 3.1.

Page 17 of 24

C C C Table 3.6-1 Risk Impact Analysis Results 3 LERF Impacte3)

CDF Impact l System" I Category Consequence Rank DMs Failure Potential Rank Section Xl(2j Inspections Ri-ISI Delta w/ POD wlo POD wI POD w/o POD RC 2 High TASCS, TT Medium 9 8 -1 -3.42E-09 3.80E-10 -9.90E-10 1.10E-10 RC 2 High TT, PWSCC Medium 4 2 -2 -4.56E-10 7.60E-10 -1.32E-10 2.20E-10 RC 2 High TASCS Medium 0 0 0 no change no change no change no change RC 2 High TT Medium 7 7 0 -3.19E-09 no change -9.24E-10 no change RC 2 High PWSCC Medium 18 4 -14 5.32E-09 5.32E-09 1.54E-09 1.54E-09 RC 4 High None Low 37 18 -19 3.61E-10 3.61E-10 1.05E-10 1.05E-10 RC 6 Medium None Low 0 0 0 no change no change no change no change RC Total -1.39E-09 6.82E-09 -4.02E-10 1.97E-09 RHR 2 High TASCS Medium 2 2 0 -9.12E-10 no change -2.64E-10 no change RHR 4 High None Low 0 6 6 -1.14E-10 -1.14E-10 -3.30E-11 -3.30E-11 RHR 5 Medium TASCS Medium 0 1 1 -1.80E-11 -1.00E-11 -1.80E-12 -1.00E-12 RHR 6 Medium None Low 17 0 -17 negligible negligible negligible negligible RHR Total -1.04E-09 -1.24E-10 -2.99E-10 -3.40E-11 SI 2 High TASCS,TT Medium 5 4 -1 -1.60E-09 3.80E-10 -4.62E-10 1.10E-10 SI 2 High TASCS Medium 5 1 -4 4.56E-10 1.52E-09 1.32E-10 4.40E-10 SI 2 High TT Medium 7 2 -5 2.28E-10 1.90E-09 6.60E-11 5.50E-10 SI 4 High None Low 28 22 -6 1.14E-10 1.14E-10 3.30E-11 3.30E-11 SI 5 Medium TT, IGSCC Medium 0 1 1 -1.80E-11 -1.00E-11 -1.80E-12 -1.OOE-12 SI 5 Medium TT Medium 0 0 0 no change no change no change no change SI 5 Medium IGSCC Medium 0 2 2 -2.00E-11 -2.OOE-11 -2.OOE-12 -2.OOE-12 SI 6 Medium None Low 45 0 -45 negligible negligible negligible negligible SI 7 Low None Low 3 0 -3 negligible negligible negligible negligible SI Total -8.36E-10 3.88E-09 -2.35E-10 1.1 3E.09 Page 18 of 24

C C (

Table 3.6-1 Risk Impact Analysis Results System(1 Category jConsequence Rank DIs Failure Potential Rank Section X12 Inspections RI-ISI Delta CDF Impacte3 )

w/ POD j wlo POD w/

LERF Impact13 )

POD CS 2 High TASCS,TT Medium 0 1 1 -6.84E-10 -3.80E-10 -1.98E-10 -1.10E-10 CS 2 High TT Medium 0 6 6 -4.10E-09 -2.28E-09 -1.19E-09 -6.602-10 CS 4 High None Low 0 2 2 -3.80E-11 -3.80E-11 -1.101-11. -1.10E-11 CS 5 Medium TT Medium 0 1 1 -1.80E-11 -1.00E-11 -1.80E-12 -1.00E-12 CS 6 Medium None Low 16 0 -16 negligible negligible negligible negligible CS Total -4.84E-09 -2.71 E-09 -1.40E-09 -7.82E-10 SP 4 High None Low 0 1 1 -1.901-11 -1.90E-11 -5.50E-12 -5.50E-12 SP 6 Medium None Low 11 0 -11 negligible negligible negligible negligible SP 7 Low None Low 0 0 0 no change no change no change no change SP Total -1.90E-11 -1.90E-11 -5.50E-12 -5.50E-12 MS 6 Medium None Low 11 0 -11 negligible negligible negligible negligible MS Total negligible negligible negligible negligible FW 5 Medium TASCS Medium 1 1 0 -1.202-11 no change -1.20E-12 no change FW 6 (3) Medium None (FAC) Low (High) 1 0 -1 negligible negligible negligible negligible FW 6 Medium None Low 6 0 -6 negligible negligible negligible negligible FW Total -1.20E-11 negligible -1.20E.12 negligible EF 2 High TT Medium 1 1 0 -4.56E-10 no change -1.32E-10 no change EF 4 High None Low 2 1 -1 1.90E-11 1.90E-11 5.502-12 5.50E-12 EF Total -4.37E-10 1.902-11 -1.27E-10 5.50E-12 SW 6 (5) Medium None (MIC, PIT) Low (Medium) 5 0 -5 negligible negligible negligible negligible SW Total I negligible negligible negligible negligible Grand Total_ -8.58E-09 7.87E.09 -2.47E-09 2.29E.09 Notes

1. Systems are described in Table 3.1.

Page 19 of 24

Notes for Table 3.6-1 (cont'd)

2. Only those ASME Section XI Code inspection locations that received a volumetric examination in addition to a surface examination are Included In the count. Inspection locations previously subjected to a surface examination only were not considered inaccordance with Section 3.7.1 of EPRI TR-1 12657.

3. Per Section 3.7.1 of EPRI TR-112657, the contribution of low risk categories 6 and 7 need not be considered in assessing the change in risk. Hence, the word "negligible" is given Inthese cases In lieu of values for CDF and LERF Impact. In those cases where no inspections were being performed previously via Section XI, and none are planned for RI-ISI purposes, "no change" is listed Instead of 'negligible".

Page 20 of 24

C C C Table 5-1 Inspection Location Selection Comparison Between ASME Section Xl Code and EPRI TR-112657 by Risk Region High Risk Region Medium Risk Region Low Risk Region System Category Weld 1989 Section XI EPRITR-112657 Wed 1989 Section XI EPRITR-112657 Weld 198 Secton XI EPRI TR-112657 Count Vol/Sur ISur Only Ri-ISI J Other(

2 Count Only ( 2 uOtherV(2)

VollSur Sur RI-ISI RC B-F 13 13 0 4 6 6 0 3 B-J 70 25 10 17 166 31 11 15 7 0 0 0 RHR B-J 5 2 0 2 3 0 0 3 18 2 0 0 C-F-1 56 0 0 4 219 15 0 0 SI B-J 28 17 1 7 58 10 8 16 283 17 53 0 C-F-1 187 18 3 9 268 31 4 0 CS B-J 25 0 7 7 15 0 7 3 64 0 13 0 C-F-1 305 16 7 0 SP C-F-1 7 0 0 1 240 11 1 0 MS C-F-2 143 11 3 0 FW C-F-2 7 1 0 1 67 7 0 0 EF C-F-2 3 1 0 1 5 2 0 1 SW C-F-2 35 5 0 0 B-F 13 13 0 4 6 6 0 3 B-J 128 44 18 33 242 41 26 37 372 19 66 0 Total C-F-1 250 18 3 14 1032 73 12 0 C-F-2 3 1 0 1 12 3 0 2 245 23 3 0 Notes

1. Systems are described InTable 3.1.

Page 21 of 24

Notes for Table 5-1 (cont'd)

2. The column labeled "Other" is generally used to identify augmented inspection program locations credited per Section 3.6.5 of EPRI TR-1 12657. The EPRI methodology allows augmented inspection program locations to be credited if the Inspection locations selected strictly for RI-ISI purposes produce less than a 10% sampling of the overall Class 1 weld population. As stated in Section 3.5 of this template, V. C. Summer achieved greater than a 10% sampling without relying on augmented inspection program locations beyond those selected by the RI-ISI process. The "Other' column has been retained In this table solely for uniformity purposes with the other RI-ISI application template submittals.

Page 22 of 24

C C C Table 5-2 Inspection Location Selection Comparison Between 1989 Section Xl Code and EPRI TR-112657 by Risk Category Consequence Failure Potential Code Weld 1989 Section Xl EPRITR-112657 Stem~i) Risk Category Rank Rank DMs Rank Category Count VoliSur Sur Only] RI-ISI IOther(2)

RC 2 High High TASCS, i Medium B-J 23 9 0 8 0 B-F 2 2 0 1 0 RC 2 High High IT, PWSCC Medium RC 2 High High TASCS Medium B-J 2 0 0 0, 0 RC 2 High High T" Medium B-J 36 7 10 7 0 B-F 11 11 0 3 0 High High PWSCC Medium RC 2 B-J 7 7 0 1 0 B-F 6 6 0 3 0 RC 4 Medium High None_______B-J Low 166 31 11 15 0 RC 6 Low Medium None Low B-J 7 0 0 0 0 RHR 2 High High TASCS Medium B-J 5 2 0 2 0 B-J 3 0 0 3 0 RHR 4 Medium High None Low C-F-I 50 0 0 3 0 RHR 5 Medium Medium TASCS Medium C-F-I 6 0 0 1 0 B-J 18 2 0 0 0 Low Medium None Low RHR 6 C-F-1 219 15 0 0 0 SI 2 High High TASCS, "T Medium B-J 7 5 0 4 0 SI 2 High High TASCS Medium B-J 13 5 1 1 0 SI 2 High High TT Medium B-J 8 7 0 2 0 B-J 28 10 0 13 0 Medium High None Low Si 4 C-F-I 187 18 3 9 0 Si 5 Medium Medium TT, IGSCC Medium B-J 4 0 1 1 0 SI 5 Medium Medium T" Medium B-J 10 0 7 0 0 Si 5 Medium Medium IGSCC Medium B-J 16 0 0 2 0 Page 23 of 24

C (Ut Table 5-2 (cont'd)

Inspection Location Selection Comparison Between 1989 Section XI Code and EPRI TR-112657 by Risk Category System (l ) Risk Consequence Failure Potential Code Weld 1989 Section XI EPRITR-112657 Category Rank Rank J DMs Rank Category Count Vol/Sur ISur Only] RI-ISI Other(2 )

B-J 253 17 53 0 0 Si 6 Low Medium None Low C-F-1 264 28 4 0 0 Si 7 Low Low None Low C-F-1 4 3 0 0 0 CS 2 High High TASCS, iT Medium B-J 7 0 3 1 0 CS 2 High High TT Medium B-J 18 0 4 6 0 CS 4 Medium High None Low B-J 11 0 4 2 0 CS 5 Medium Medium TT Medium B-J 4 0 3 1 0 B-J 64 0 13 0 0 CS 6 Low Medium None Low C-F-i 305 16 7 0 0 SP 4 Medium High None Low C-F-1 7 0 0 1 0 SP 6 Low Medium None Low C-F-1 226 11 1 0 0 SP 7 Low Low None Low C-F-1 14 0 0 0 0 MS 6 Low Medium None Low C-F-2 143 11 3 0 0 FW 5 Medium Medium TASCS Medium C-F-2 7 1 0 1 0 FW 6 (3) Low (High) Medium None (FAC) Low (High) C-F-2 15 1 0 0 0 FW 6 Low Medium None Low C-F-2 52 6 0 0 0 EF 2 High High TT Medium C-F-2 3 1 0 1 0 EF 4 Medium High None Low C-F-2 5 2 0 1 0 SW 6 (5) Low (Medium) Medium None (MIC, PIT) Low (Medium) C-F-2 35 5 0 0 0 Notes

1. Systems are described In Table 3.1.

2. The column labeled "Other" Is generally used to Identify augmented Inspection program locations credited per Section 3.6.5 of EPRI TR-112657. The EPRI methodology allows augmented inspection program locations to be credited ifthe Inspection locations selected strictly for RI-ISI purposes produce less than a 10% sampling of the overall Class I weld population. As stated In Section 3.5 of this template, V. C. Summer achieved a 10% sampling without relying on augmented Inspection program locations beyond those selected by the RI-ISI process. The "Other" column has been retained in this table solely for uniformity purposes with the other RI-ISI application template submittals.

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