ML13077A389

Response to Request for Additional Information (RAI 42) Regarding Confirmatory Action Letter Response

ML13077A389
Person / Time
Site:	San Onofre
Issue date:	03/15/2013
From:	St.Onge R Edison International Co, Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC ME9727
Download: ML13077A389 (21)

Text

SOUTHERN CALIFORNIA Richard I. St. Onge EDISONI EDISONDirector. Nuclear Regulatory Affairs and Emergency Planning An EDISON INTERNATIONAL Company March 15, 2013 10 CFR 50.4 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Subject:

Docket No. 50-361 Response to Request for Additional Information (RAI 42)

Regarding Confirmatory Action Letter Response (TAC No. ME 9727)

San Onofre Nuclear Generating Station, Unit 2

References:

1. Letter from Mr. Elmo E. Collins (USNRC) to Mr. Peter T. Dietrich (SCE), dated March 27, 2012, Confirmatory Action Letter 4-12-001, San Onofre Nuclear Generating Station, Units 2 and 3, Commitments to Address Steam Generator Tube Degradation

2. Letter from Mr. Peter T. Dietrich (SCE) to Mr. Elmo E. Collins (USNRC), dated October 3, 2012, Confirmatory Action Letter - Actions to Address Steam Generator Tube Degradation, San Onofre Nuclear Generating Station, Unit 2

3. Email from Mr. James R. Hall (USNRC) to Mr. Ryan Treadway (SCE), dated February 20, 2013, Request for Additional Information (RAIs 38-52) Regarding Response to Confirmatory Action Letter, San Onofre Nuclear Generating Station, Unit 2

Dear Sir or Madam,

On March 27, 2012, the Nuclear Regulatory Commission (NRC) issued a Confirmatory Action Letter (CAL) (Reference 1) to Southern California Edison (SCE) describing actions that the NRC and SCE agreed would be completed to address issues identified in the steam generator tubes of San Onofre Nuclear Generating Station (SONGS) Units 2 and 3. In a letter to the NRC dated October 3, 2012 (Reference 2), SCE reported completion of the Unit 2 CAL actions and included a Return to Service Report (RTSR) that provided details of their completion.

By email dated February 20, 2013 (Reference 3), the NRC issued Requests for Additional Information (RAI) regarding the CAL response. Enclosure 2 of this letter provides the response to RAI 42.

63 (

P.O. Box 128 San Clemente, CA 92672

Document Control Desk March 15, 2013 There are no new regulatory commitments contained in this letter. If you have any questions or require additional information, please call me at (949) 368-6240.

Sincerely,

Enclosures:

1. Response to RAI 42 cc: E. E. Collins, Regional Administrator, NRC Region IV J. R. Hall, NRC Project Manager, SONGS Units 2 and 3 G. G. Warnick, NRC Senior Resident Inspector, SONGS Units 2 and 3 R. E. Lantz, Branch Chief, Division of Reactor Projects, NRC Region IV

ENCLOSURE 1 SOUTHERN CALIFORNIA EDISON RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RESPONSE TO CONFIRMATORY ACTION LETTER DOCKET NO. 50-361 TAC NO. ME 9727 Response to RAI 42

RAI 42

In Reference 3, p. 4 (4 of 62), SCE does not conclusively state which screened tubes were actually plugged. Please discuss the threshold and implementation of the criteria (with exceptions) and provide or refer to a list of confirmed plugged tubes in Unit 2.

RESPONSE

Note: RAI Reference 3 is MHI Document L5-04GA571, "Screening Criteria for Susceptibility to In-Plane Tube Motion," Revision 6, dated October 3, 2012.

Conclusively state which screened tubes were plugged All tubes with an aggregate score at or above the threshold screening level were plugged. The Unit 2 steam generator (SG) tubes meeting the screening criteria from RAI Reference 3 are listed in Table 15, for SG 2E-089, and Table 16, for SG 2E-088.

Discuss the threshold and implementation of the criteria (with exceptions)

RAI Reference 3 identified nine screening criteria found to indicate susceptibility to tube-to-tube wear (TTW) from Unit 3 results:

1. COUNT - Number of wear indications at anti-vibration bar (AVB) intersections

2. HOT COUNT - Number of AVB wear indications on the hot leg side of U-bend

3. HIGH/LOW - Wear indications at AVB bars B01/B02 and B131/B12

4. CONTINUOUS -Number of consecutive AVB wear indications

5. TSP -Wear indications at upper tube support plate (TSP) intersections (TSP 5, 6 and 7)

6. LENGTH - Length of AVB wear scars as determined from bobbin coil inspection data

7. VOID - Average void fraction that the tube is exposed to in U-bend region

8. REGION - Distance to center of AVB wear area

9. COUPLING - Coupling effect between adjacent tubes (i.e., proximity to tubes that screen in for plugging)

Details of the nine screening criteria are described in RAI Reference 3, Section 3, "Proposed screening criteria based on Unit 3 results."

Weighting factors for each of the nine criteria were developed based on the proportion of Unit 3 tubes meeting the criteria that exhibited TTW. Individual thresholds were not set for each criterion. Instead, all nine weighting factors were aggregated to produce a combined, tube-specific TTW susceptibility score. Using the examination data from the 326 tubes found with TTW in Unit 3, a threshold screening level was established such that the combined TTW susceptibility scores of all tubes exhibiting TTW were above the threshold screening level. This assured that the false negative rate for the threshold screening level was zero.

The screening criteria were applied to tubes in both Unit 2 SGs, and 99 tubes in SG 2E-088 and 203 tubes in SG 2E-089 were identified with combined TTW susceptibility scores above the threshold screening level. Further validating the screening criteria approach, the 203 screened tubes in SG 2E-089 included both tubes in SG 2E-089 found with TTW (no tubes in SG 2E-088 were found with TTW).

Page 2 of 19

No exceptions were taken to the screening criteria. However, additional tubes were selected for preventative plugging based on recommendations from vendors and industry experts. Refer to Table 8-4 of the CAL Response, Enclosure 2, SONGS Unit 2 Return to Service Report.

Provide a list of confirmed plugged tubes in Unit 2 SONGS Nuclear Engineering Change Package (NECP) 800873488, Revision 0, Affected Section Change (ASC) D0062286, contains lists of the confirmed plugged tubes in Unit 2. The following pages provide the tube plugging lists excerpted from this NECP. The highlighted tubes were those recommended for plugging in RAI Reference 3, Tables 15 and 16.

Page 3 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page _28_of U2NCP No800873486 43 1 U2 NECP 800873488 RSG 2E-088 Tube Plugging/Stabilizing Lista Row Col Plug Stab Typeb Stab Length (in) Reason 112 88 Yes Single 668 35% TWD AVB 133 91 Yes Single 668 35% TWD AVB 124 48 Yes Single 668 47% TWD- Retainer Bar 125 49 Yes Single 668 54% TWD - Retainer Bar 120 92 Yes Single 668 Preventative -AVB 128 94 Yes Single 668 Preventative -AVB 121 81 Yes Split Note c Preventative - FSW 120 82 Yes Split Note c Preventative. FSW 105 83 Yes Split Note c Preventative - FSW 107 83 Yes Split Note c Preventative - FSW 104 84 Yes Split Note c Preventative - FSW 106 84 Yes Split Note c Preventative - FSW 108 84 Yes Split Note c Preventative - FSW 122 84 Yes Split Note c Preventative - FSW 97 85 Yes Split Note c Preventative - FSW 99 85 Yes Split Note c Preventative - FSW 103 85 Yes Split Note c Preventative - FSW 105 85 Yes Split Note c Preventative - FSW 107 85 Yes Split Note c Preventative - FSW 115 85 Yes Split Note c Preventative - FSW 121 85 Yes Split Note c Preventative - FSW 123 8S Yes Split Note c Preventative - FSW 133 85 Yes Split Note c Preventative - FSW 98 86 Yes Split Note c Preventative - FSW 100 86 Yes Split Note c Preventative - FSW 102 86 Yes Split Note c Preventative - FSW 104 86 Yes Split Note c Preventative - FSW 106 86 Yes Split Note c Preventative - FSW 108 86 Yes Split Note c Preventative - FSW 112 86 Yes Split Note c Preventative - FSW 114 86 Yes Split Note c Preventative - FSW 116 86 Yes Split Note c Preventative - FSW 122 86 Yes Split Note c Preventative - FSW 124 86 Yes Split Note c Preventative - FSW a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2- Steam Generators 88 & 89- 2012.-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 1 of 16 Page 4 of 19

NECP Number 800873488 Rev 0 Page 29 of 43 1 U2NCP No800873486 U2 NECP 800873488 RSG 2E-088 Tube Plugging/Stabilizing Lista Row Col Plug Stab Typeb Stab Length (in) Reason 126 86 Yes Split Note c Preventative - FSW 101 87 Yes Split Note c Preventative - FSW 103 87 Yes Split Note c Preventative - FSW 105 87 Yes Split Note c Preventative - FSW 111 87 Yes Split Note c Preventative - FSW 113 87 Yes Split Note c Preventative - FSW 115 87 Yes Split Note c Preventative - FSW 121 87 Yes Split Note c Preventative - FSW 123 87 Yes Split Note c Preventative - FSW 125 87 Yes Split Note c Preventative - FSW 100 88 Yes Split Note c Preventative - FSW 102 88 Yes Split Note c Preventative - FSW 104 88 Yes Split Note c Preventative - FSW 106 88 Yes Split Note c Preventative - FSW 110 88 Yes Split Note C Preventative - FSW 114 88 Yes Split Note c Preventative - FSW 116 88 Yes Split Note c Preventative - FSW 118 88 Yes Split Note c Preventative - FSW 120 88 Yes Split Note c Preventative - FSW 122 88 Yes Split Note c Preventative - FSW 124 88 Yes Split Note c Preventative - FSW 95 89 Yes Split Note c Preventative - FSW 101 89 Yes Split Note c Preventative - FSW 103 89 Yes Split Note c Preventative - FSW 105 89 Yes Split Note c Preventative - FSW 107 89 Yes Split Note c Preventative - FSW 111 89 Yes Split Note c Preventative - FSW 113 89 Yes Split Note c Preventative - FSW 115 89 Yes Split Note c Preventative - FSW 117 89 Yes Split Note c Preventative - FSW 119 89 Yes Split Note c Preventative - FSW 121 89 Yes Split Note c Preventative - FSW 123 89 Yes Split Note c Preventative - FSW 127 89 Yes Split Note c Preventative - FSW a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Steam Generators 88 & 89- 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 2 of 16 Page 5 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page _Mof List" 43 1 800873488 U2 NECP U2 NECP Tube 800873488 Plugging/Stabilizing 2E-088 RSG RSG 2E-088 Tube Plugging/Stabilizing List' Row Col Plug Stab Typeb Stab Length (in) Reason 94 90 Yes Split Note c Preventative - FSW 100 90 Yes Split Note c Preventative - FSW 102 90 Yes Split Note c Preventative - FSW 104 90 Yes Split Note c Preventative - FSW 106 90 Yes Split Note c Preventative - FSW 110 90 Yes Split Note c Preventative - FSW 112 90 Yes Split Note c Preventative - FSW 114 90 Yes Split Note c Preventative - FSW 116 90 Yes Split Note c Preventative - FSW 95 91 Yes Split Note c Preventative - FSW 101 91 Yes Split Note c Preventative - FSW 103 91 Yes Split Note c Preventative - FSW 105 91 Yes Split Note c Preventative - FSW 107 91 Yes Split Note c Preventative - FSW 109 91 Yes Split Note c Preventative - FSW 111 91 Yes Split Note c Preventative - FSW 113 91 Yes Split Note c Preventative - FSW 115 91 Yes Split Note c Preventative - FSW 117 91 Yes Split Note c Preventative - FSW 98 92 Yes Split Note c Preventative - FSW 100 92 Yes Split Note c Preventative - FSW 102 92 Yes Split Note c Preventative - FSW 104 92 Yes Split Note c Preventative - FSW 106 92 Yes Split Note c Preventative- FSW 108 92 Yes Split Note c Preventative - FSW 110 92 Yes Split Note c Preventative - FSW 112 92 Yes Split Note c Preventative - FSW 114 92 Yes Split Note c Preventative - FSW 116 92 Yes Split Note c Preventative - FSW 118 92 Yes Split Note c Preventative - FSW 136 92 Yes Split Note c Preventative - FSW 99 93 Yes Split Note c Preventative - FSW 101 93 Yes Split Note c Preventative - FSW 103 93 Yes Split Note c Preventative - FSW a) From AREVA Steam Generator Eddy Current Final Report -San Onofre Nuclear Generating Station (SONGS) Unit 2- Steam Generators 88 & 89- 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 3 of 16 Page 6 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 31 of 43 1 U2 NECP 800873488 RSG 2E-088 Tube Plugging/Stabilizing Lista Row Col Plug Stab Typeb Stab Length (in) Reason 107 93 Yes Split Note c Preventative - FSW 111 93 Yes Split Note c Preventative - FSW 117 93 Yes Split Note c Preventative - FSW 129 93 Yes Split Note c Preventative - FSW 94 94 Yes Split Note c Preventative -FSW 4

135 93 Yes Split Note c Preventative - FSW 137 89 Yes Split Note c Preventative - FSWd 108 34 Yes None Preventative - Retainer Bar 110 34 Yes Single 668 Preventative - Retainer Bar 111 35 Yes None Preventative - Retainer Bar 109 35 Yes Single 668 Preventative - Retainer Bar 110 36 Yes None Preventative - Retainer Bar 112 36 Yes None Preventative - Retainer Bar 111 37 Yes None Preventative - Retainer Bar 113 37 Yes None Preventative - Retainer Bar 112 38 Yes None Preventative - Retainer Bar 114 38 Yes None Preventative - Retainer Bar 113 39 Yes None Preventative - Retainer Bar 11S 39 Yes None Preventative - Retainer Bar 114 40 Yes None Preventative - Retainer Bar 116 40 Yes None Preventative - Retainer Bar 115 41 Yes None Preventative - Retainer Bar 117 41 Yes None Preventative - Retainer Bar 116 42 Yes None Preventative - Retainer Bar 118 42 Yes None Preventative - Retainer Bar 117 43 Yes None Preventative - Retainer Bar 119 43 Yes None Preventative - Retainer Bar 118 44 Yes None Preventative - Retainer Bar 120 44 Yes None Preventative - Retainer Bar 119 45 Yes None - Preventative - Retainer Bar 121 45 Yes Single 668 Preventative - Retainer Bar 122 46 Yes None - Preventative - Retainer Bar 120 46 Yes Single 668 Preventative - Retainer Bar 121 47 Yes None Preventative - Retainer Bar a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Steam Generators 88 & 89 - 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 4 of 16 Page 7 of 19

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ACt' ki rnnC)')QC Page ag _322f4of 43 1 U2 NECP 800873488 RSG 2E-088 Tube Plugging/Stabilizing Lista Row Col Plug Stab Typeb Stab Length (in) Reason 123 47 Yes None Preventative - Retainer Bar 122 48 Yes None Preventative - Retainer Bar 123 49 Yes None Preventative - Retainer Bar 124 50 Yes None Preventative - Retainer Bar 126 50 Yes None Preventative - Retainer Bar 125 51 Yes None Preventative - Retainer Bar 127 51 Yes None Preventative - Retainer Bar 126 52 Yes None Preventative - Retainer Bar 128 52 Yes None Preventative - Retainer Bar 127 53 Yes None Preventative - Retainer Bar 129 53 Yes None Preventative - Retainer Bar 128 54 Yes None Preventative - Retainer Bar 130 54 Yes None Preventative - Retainer Bar 129 55 Yes None Preventative - Retainer Bar 131 55 Yes None Preventative - Retainer Bar 130 56 Yes Single 668 Preventative - Retainer Bar 132 56 Yes Single 668 Preventative - Retainer Bar 131 57 Yes None Preventative - Retainer Bar 131 121 Yes None - Preventative - Retainer Bar 130 122 Yes Single 668 Preventative - Retainer Bar 132 122 Yes Single 668 Preventative - Retainer Bar 129 123 Yes None - Preventative - Retainer Bar 131 123 Yes None Preventative - Retainer Bar 128 124 Yes None Preventative - Retainer Bar 130 124 Yes None Preventative - Retainer Bar 127 125 Yes None Preventative - Retainer Bar 129 125 Yes None Preventative - Retainer Bar 126 126 Yes None Preventative - Retainer Bar 128 126 Yes None Preventative - Retainer Bar 125 127 Yes None Preventative - Retainer Bar 127 127 Yes None Preventative - Retainer Bar 124 128 Yes None Preventative - Retainer Bar 126 128 Yes None Preventative - Retainer Bar 123 129 Yes None Preventative - Retainer Bar a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Steam Generators 88 & 89 - 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilzer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23)

Attachment 3 PAGE S of 16 Page 8 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 33 of 43 1 U2 NECP 800873488 LiSta RSG ZE-088 Tube Plugging/Stabilizing Row Col Plug Stab Typeb Stab Length (in) Reason 125 129 Yes None Preventative - Retainer Bar 122 130 Yes None Preventative - Retainer Bar 124 130 Yes None Preventative - Retainer Bar 121 131 Yes None Preventative - Retainer Bar 123 131 Yes None Preventative - Retainer Bar 122 132 Yes None - Preventative - Retainer Bar 120 132 Yes Single 668 Preventative - Retainer Bar 119 133 Yes None - Preventative - Retainer Bar 121 133 Yes Single 668 Preventative - Retainer Bar 118 134 Yes None - Preventative - Retainer Bar 120 134 Yes None Preventative - Retainer Bar 117 135 Yes None Preventative - Retainer Bar 119 135 Yes None Preventative - Retainer Bar 116 136 Yes None Preventative - Retainer Bar 118 136 Yes None Preventative - Retainer Bar 115 137 Yes None Preventative - Retainer Bar 117 137 Yes None Preventative - Retainer Bar 114 138 Yes None Preventative - Retainer Bar 116 138 Yes None Preventative - Retainer Bar 113 139 Yes None Preventative - Retainer Bar 115 139 Yes None Preventative - Retainer Bar 112 140 Yes None Preventative - Retainer Bar 114 140 Yes None Preventative - Retainer Bar 111 141 Yes None Preventative - Retainer Bar 113 141 Yes None Preventative - Retainer Bar 110 142 Yes None Preventative - Retainer Bar 112 142 Yes None Preventative - Retainer Bar 111 143 Yes None - Preventative - Retainer Bar 109 143 Yes Single 668 Preventative - Retainer Bar 108 144 Yes None - Preventative - Retainer Bar 110 144 Yes Single 668 Preventative - Retainer Bar 98 84 Yes Split Note c Wear at 6 Continuous AVBs 88 88 Yes Split Note c Wear at 6 Continuous AVBs 97 89 Yes Split Note c Wear at 6 Continuous AVBs a) From AREVA Steam Generator Eddy Current Final Report -San Onofre Nuclear Generating Station (SONGS) Unit 2- Steam Generators 88 & 89- 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 6 of 16 Page 9 of 19

NECP Number 800873488 Rev 0 ASC No- D0062286 Page 34 of 43 1 U2 NECP 800873488 RSG 2E-088 Tube Plugging/Stabilizing Lista Row Col Plug Stab Typeb Stab Length (in) Reason 108 90 Yes Split Note c Wear at 6 Continuous AVBs 124 92 Yes Split Note c Wear at 6 Continuous AVBs 134 94 Yes Split Note c Wear at 6 Continuous AVBs a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Steam Generators 88 & 89 - 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 7 of 16 Page 10 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 35 of 43 1 U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Usta Row Col Plug Stab Typeb Stab Length (in) Reason 111 81 Yes Split Note c 14% TWD- FSW (Preventative) 113 81 Yes Split Note c 14% TWD- FSW (Preventative) 127 127 Yes Single 668 38% TWD - Retainer Bar 119 133 Yes Single 668 90% TWD - Retainer Bar 103 77 Yes Split Note c Preventative - FSW 109 77 Yes Split Note c Preventative - FSW 111 77 Yes Split Note c Preventative - FSW 100 78 Yes Split Note c Preventative - FSW 102 78 Yes Split Note c Preventative - FSW 104 78 Yes Split Note c Preventative - FSW 108 78 Yes Split Note c Preventative - FSW 110 78 Yes Split Note c Preventative - FSW 112 78 Yes Split Note c Preventative - FSW 97 79 Yes Split Note c Preventative - FSW 99 79 Yes Split Note c Preventative - FSW 101 79 Yes Split Note c Preventative - FSW 112 79 Yes Split Note c Preventative - FSW 92 80 Yes Split Note c Preventative - FSW 94 80 Yes Split Note c Preventative - FSW 96 80 Yes Split Note c Preventative - FSW 98 80 Yes Split Note c Preventative - FSW 100 80 Yes Split Note c Preventative - FSW 102 80 Yes Split Note c Preventative - FSW 110 80 Yes Split Note c Preventatve - FSW 112 80 Yes Split Note c Preventative - FSW 114 80 Yes Split Note c Preventative - FSW 91 81 Yes Split Note c Preventative - FSW 93 81 Yes Split Note c Preventative - FSW 9S 81 Yes Split Note c Preventative - FSW 97 81 Yes Spilt Note c Preventative - FSW 99 81 Yes Split Note c Preventative - FSW 101 81 Yes Split Note c Preventative - FSW 1U3 81 Yes Split Note c Preventative - FSW 106 81 Yes Split Note c Preventative - FSW 107 81 Yes Split Note c Preventative - FSW a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 -Steam Generators 88 & 89-2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabiizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 8 of 16 Page 11 of 19

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Attachment 3 PAGE 9 of 16 Page 12 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 37 of 43 1 U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Usta Row Col Plug Stab Typeb Stab Length (in) Reason 117 83 Yes Split Note c Preventative - FSW 119 83 Yes Split Note c Preventatve - FSW 121 83 Yes Split Note c Preventative - FSW 90 84 Yes Split Note c Preventative - FSW 92 84 Yes Split Note c Preventative - FSW 94 84 Yes Split Note c Preventative - FSW 96 84 Yes Split Note c Preventative - FSW 98 84 Yes Split Note c Preventative - FSW 100 84 Yes Split Note c Preventative - FSW 102 84 Yes Split Note c Preventative - FSW 104 84 Yes Split Note c Preventatlve - FSW 106 84 Yes Split Note c Preventative - FSW 106 84 Yes Split Note c Preventative - FSW 110 84 Yes Split Note c Preventative - FSW 112 84 Yes Split Note c Preventative - FSW 114 84 Yes Split Note c Preventative - FSW 116 84 Yes Split Note c Preventative - FSW 118 84 Yes Split Note c Preventative - FSW 120 84 Yes Split Note c Preventative - FSW 126 84 Yes Split Note c Preventative - FSW 128 84 Yes Split Note c Preventative - FSW 132 84 Yes Split Note c Preventative - FSW 91 85 Yes Split Note c Preventative - FSW 93 85 Yes Split Note c Preventative - FSW 95 85 Yes Split Note c Preventative - FSW 97 85 Yes Split Note c Preventativ - FSW 99 85 Yes Split Note c Preventative - FSW 101 85 Yes Split Note c Preventative - FSW 103 85 Yes Split Note c Preventative - FSW 105 85 Yes Split Note c Preventative - FSW 107 85 Yes Split Note c Preventative - FSW 109 85 Yes Split Note c Preventative - FSW 1U 85 Yes Split Note c Preventative - FSW 113 85 Yes Split Note c Preventative - FSW 115 85 Yes Split Note c Preventative - FSW a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Stea m Generators 88 & 89 - 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 10 of 16 Page 13 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 38 of 43 1

U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Lista Row Col Plug Stab Typeb Stab Length (in) Reason 117 85 Yes Split Note c Preventative - FSW 119 85 Yes Split Note c Preventative - FSW 121 85 Yes Split Note c Preventative - FSW 127 85 Yes Split Note c Preventative - FSW 88 86 Yes Split Note c Preventative - FSW 92 86 Yes Split Note c Preventative - FSW 94 86 Yes Split Note c Preventative - FSW 96 86 Yes Split Note c Preventative - FSW 98 86 Yes Split Note c Preventative - FSW 100 86 Yes Split Note c Preventative - FSW 102 86 Yes Split Note c Preventative - FSW 104 86 Yes Split Note c Preventative - FSW 106 86 Yes Split Note c Preventative - FSW 108 86 Yes Split Note c Preventative - FSW 110 86 Yes Split Note c Preventative - FSW 112 86 Yes Split Note c Preventative - FSW 114 86 Yes Split Note c Preventative - FSW 116 86 Yes Split Note c Preventative - FSW 118 86 Yes Split Note c Preventative - FSW 122 86 Yes Split Note c Preventative - FSW 130 86 Yes Split Note c Preventative - FSW 93 87 Yes Split Note c Preventative - FSW 95 87 Yes Split Note c Preventative - FSW 97 87 Yes Split Note c Preventative - FSW 99 87 Yes Split Note c Preventative - FSW 101 87 Yes Split Note c Preventative - FSW 103 87 Yes Split Note c Preventative - FSW 105 87 Yes Split Note c Preventative - FSW 107 87 Yes Split Note c Preventative - FSW 109 87 Yes Split Note c Preventative - FSW 111 87 Yes Split Note c Preventative - FSW 113 87 Yes Split Note c Preventative - FSW 115 87 Yes Split Note c Preventative - FSW 117 87 Yes Split Note c Preventative - FSW 119 87 Yes Split Note c Preventative - FSW a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 -Steam Generators 88 & 89- 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 11 of 16 Page 14 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 39 of 43 1 U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Usta Row Col Plug Stab Typeb Stab Length (in) Reason 129 87 Yes Split Note c Preventative - FSW 94 88 Yes Split Note c Preventative - FSW 96 88 Yes Split Note c Preventative - FSW 98 88 Yes Split Note c Preventative - FSW 100 88 Yes Split Note c Preventative - FSW 102 88 Yes Split Note c Preventative - FSW 104 88 Yes Split Note c Preventative - FSW 106 88 Yes Split Note c Preventative - FSW 10 88 Yes Split Note c Preventative - FSW 110 88 Yes Split Note c Preventative- FSW 112 88 Yes Split Note c Preventative - FSW 114 88 Yes Split Note c Preventative - FSW 116 88 Yes Split Note c Preventative - FSW 118 88 Yes Split Note c Preventative - FSW 138 88 Yes Split Note c Preventative - FSW 95 89 Yes Split Note c Preventative - FSW 97 89 Yes Split Note c Preventative - FSW 99 89 Yes Split Note c Preventative - FSW 101 89 Yes Split Note c Preventative - FSW 103 89 Yes Split Note c Preventatlve - FSW 105 89 Yes Split Note c Preventative - FSW 107 89 Yes Split Note c Preventative - FSW 109 89 Yes Split Note c Preventative - FSW 111 89 Yes Split Note c Preventative - FSW 113 89 Yes Split Note c Preventative - FSW 115 89 Yes Split Note c Preventative - FSW 117 89 Yes Split Note c Preventative - FSW 131 89 Yes Split Note c Preventative - FSW 100 90 Yes split Note c Preventative - FSW 102 90 Yes Split Note c Preventative - FSW 104 90 Yes Split Note c Preventative - FSW 106 90 Yes Split Note c Preventative - FSW 108 90 Yes Split Note c Preventative - FSW 110 90 Yes Split Note c Preventative - FSW 112 90 Yes Split Note c Preventative - FSW a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Steam Generators 88 & 89 - 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 12 of 16 Page 15 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 40 of 43 U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Usta Row Col Plug Stab Type? Stab Length (in) Reason 114 90 Yes Split Note c Preventative - FSW 116 90 Yes Split Note c Preventative - FSW 118 90 Yes Split Note c Preventative - FSW 130 90 Yes Split Note c Preventative - FSW 132 90 Yes Split Note c Preventative - FSW 134 90 Yes Split Note c Preventative - FSW 99 91 Yes Split Note c Preventative - FSW 105 91 Yes Split Note c Preventative - FSW 107 91 Yes Split Note c Preventative - FSW 109 91 Yes Split Note c Preventative - FSW 113 91 Yes Split Note c Preventative - FSW 115 91 Yes Split Note c Preventative - FSW 117 91 Yes Split Note c Preventative - FSW 123 91 Yes Split Note c Preventative - FSW 98 92 Yes Split Note c Preventative - FSW 104 92 Yes Split Note c Preventative - FSW 108 92 Yes Split Note c Preventative - FSW 114 92 Yes Split Note c Preventative- FSW 116 92 Yes Split Note c Preventative - FSW 103 93 Yes Split Note c Preventative - FSW 115 93 Yes Split Note c Preventative - FSW 102 94 Yes Split Note c Preventative - FSW 114 94 Yes Split Note c Preventative - FSW 116 94 Yes Split Note c Preventative - FSW 103 95 Yes Split Note c Preventative - FSW 105 95 Yes Split Note c Preventative - FSW 107 95 Yes Split Note c Preventative - FSW 109 95 Yes Split Note c Preventative - FSW 115 95 Yes Split Note c Preventative - FSW 109 97 Yes Split Note c Preventative - FSW 110 98 Yes Split Note c Preventative - FSW 112 98 Yes Split Note c Preventative - FSW 80 68 Yes Split Note c Preventative - FSWd 104 72 Yes Split Nate c Preventative - FSWd 132 94 Yes Split Note c Preventative - FSWd a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 -Steam Generators 88 &89 -2012-UJ2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabiizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 13 of 16 Page 16 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 41 of 43 /

U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Usta Row Col Plug Stab Typeb Stab Length (in) Reason 108 34 Yes None - Preventative - Retainer Bar 110 34 Yes Single 668 Preventative - Retainer Bar 111 35 Yes None - Preventative - Retainer Bar 109 35 Yes Single 668 Preventative - Retainer Bar 110 36 Yes None - Preventative - Retainer Bar 112 36 Yes None Preventative - Retainer Bar 111 37 Yes None Preventative - Retainer Bar 113 37 Yes None Preventative - Retainer Bar 112 38 Yes None Preventative - Retainer Bar 114 38 Yes None Preventative - Retainer Bar 113 39 Yes None Preventative - Retainer Bar 115 39 Yes None Preventative - Retainer Bar 114 40 Yes None Preventative - Retainer Bar 116 40 Yes None Preventative - Retainer Bar 115 41 Yes None Preventative - Retainer Bar 117 41 Yes None Preventative - Retainer Bar 116 42 Yes None Preventative - Retainer Bar 118 42 Yes None Preventative - Retainer Bar 117 43 Yes None Preventative - Retainer Bar 119 43 Yes None Preventative - Retainer Bar 120 44 Yes None - Preventative - Retainer Bar 118 44 Yes Single 668 Preventative - Retainer Bar 119 45 Yes None - Preventative - Retainer Bar 121 4S Yes Single 668 Preventative - Retainer Bar 122 46 Yes None - Preventative - Retainer Bar 120 46 Yes Single 668 Preventative - Retainer Bar 121 47 Yes None - Preventative - Retainer Bar 123 47 Yes None Preventative - Retainer Bar 122 48 Yes None Preventative - Retainer Bar 124 48 Yes None Preventative - Retainer Bar 123 49 Yes None Preventative - Retainer Bar 125 49 Yes None Preventative - Retainer Bar 124 50 Yes None Preventative - Retainer Bar 126 50 Yes None Preventative - Retainer Bar 125 51 Yes None Preventative - Retainer Bar a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Steam Generators 88 & 89 - 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 14 of 16 Page 17 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 42 of 43 1 ASC No D0062286 U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Usta Row Col Plug Stab Typeb Stab Length (in) Reason 127 51 Yes None Preventative - Retainer Bar 126 52 Yes None Preventative - Retainer Bar 128 52 Yes None Preventative - Retainer Bar 127 53 Yes None Preventative - Retainer Bar 129 53 Yes None Preventative - Retainer Bar 128 54 Yes None Preventative - Retainer Bar 130 54 Yes None Preventative - Retainer Bar 129 55 Yes None Preventative - Retainer Bar 131 55 Yes None - Preventative - Retainer Bar 130 56 Yes Single 668 Preventative - Retainer Bar 132 56 Yes Single 668 Preventative - Retainer Bar 131 57 Yes None Preventative - Retainer Bar 131 121 Yes None - Preventative - Retainer Bar 130 122 Yes Single 668 Preventative - Retainer Bar 132 122 Yes Single 668 Preventative - Retainer Bar 129 123 Yes None - Preventative - Retainer Bar 131 123 Yes None Preventative - Retainer Bar 128 124 Yes None Preventative - Retainer Bar 130 124 Yes None Preventative - Retainer Bar 127 125 Yes None Preventative - Retainer Bar 129 125 Yes None Preventative - Retainer Bar 126 126 Yes None Preventative - Retainer Bar 128 126 Yes None Preventative - Retainer Bar 125 127 Yes None Preventative - Retainer Bar 124 128 Yes None Preventative - Retainer Bar 126 128 Yes None Preventative - Retainer Bar 123 129 Yes None Preventative - Retainer Bar 125 129 Yes None Preventative - Retainer Bar 122 130 Yes None Preventative - Retainer Bar 124 130 Yes None Preventative - Retainer Bar 121 131 Yes None Preventative - Retainer Bar 123 131 Yes None Preventative - Retainer Bar 122 132 Yes None - Preventative - Retainer Bar 120 132 Yes Single 668 Preventative - Retainer Bar 121 133 Yes Single 668 Preventative - Retainer Bar a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 - Steam Generators 88 & 89 - 2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 15 of 16 Page 18 of 19

NECP Number 800873488 Rev 0 ASC No. D0062286 Page 43 of 43 1 U2 NECP 800873488 RSG 2E-089 Tube Plugging/Stabilizing Usta Row Col Plug StabTypeb Stab Length (in) Reason 118 134 Yes None Preventative - Retainer Bar 120 134 Yes None Preventative - Retainer Bar 117 135 Yes None Preventative - Retainer Bar 119 135 Yes None Preventative - Retainer Bar 116 136 Yes None Preventative - Retainer Bar 118 136 Yes None Preventative - Retainer Bar 115 137 Yes None Preventative - Retainer Bar 117 137 Yes None Preventative - Retainer Bar 114 138 Yes None Preventative - Retainer Bar 116 138 Yes None Preventative - Retainer Bar 113 139 Yes None Preventative - Retainer Bar 115 139 Yes None Preventative - Retainer Bar 112 140 Yes None Preventative - Retainer Bar 114 140 Yes None Preventative - Retainer Bar 111 141 Yes None Preventative - Retainer Bar 113 141 Yes None Preventative - Retainer Bar 110 142 Yes None Preventative - Retainer Bar 112 142 Yes None Preventative - Retainer Bar 111 143 Yes None - Preventative - Retainer Bar 109 143 Yes Single 668 Preventative - Retainer Bar 108 144 Yes None Preventative - Retainer Bar 110 144 Yes Single 668 Preventative - Retainer Bar 98 76 Yes Split Note c Wear at 6 Continuous AVBs 87 79 Yes Split Note c Wear at 6 Continuous AVBs 89 83 Yes Split Note c Wear at 6 Continuous AVBs 122 84 Yes Split Note c Wear at 6 Continuous AVys 121 89 Yes Split Note c Wear at 6 Continuous AVBs 120 90 Yes Split Note c Wear at 6 Continuous AVBs a) From AREVA Steam Generator Eddy Current Final Report - San Onofre Nuclear Generating Station (SONGS) Unit 2 -Steam Generators 88 & 89-2012-U2C17 & Return to Service b) Single stabilizers are installed on the hot side of the tube, split stabilizers are installed on the hot and cold side of the tube c) See AREVA Product Information Sheet for Stabilizer U-Bend (Ref. 15) for split stabilizer lengths d) Conservatively plugged as a defense in depth action per Westinghouse recommendation (Ref. 23) PAGE 16 of 16 Page 19 of 19