ML060960198

SONGS 2, Handouts, Information Supplied by SCE in Support of Discussion

ML060960198
Person / Time
Site:	San Onofre
Issue date:	01/23/2006
From:	Kalyanam N NRC/NRR/ADRO/DORL/LPLG
To:	Rosenblum R Southern California Edison Co
Kalyanam N
Shared Package
ML060950305	List: ML060950286 ML060960198
References
TAC MC8395
Download: ML060960198 (19)

Text

SONGS Unit 2 Steam Generator Inspections 2C14 Update with the NRC January 23, 2006 Enclosure 2

SONGS Unit 2 Background Two (2) Steam Generators

- Supplied by Combustion Engineering

- Designated SG 88 and 89

- SG88 - 8411 tubes in Service (345 sleeved)

- SG89 - 8390 tubes in Service (189 sleeved)

Recent Exam Outages

- Current Refueling Outage (2C14) -17.8 EFPY

- Prior Mid-Cycle Exam (2M9) 10.8 EFPY Prompted by PWSCC at dented intersections

- Prior Refueling Outage (2C9) 10.1 EFPY Performed chemical cleaning of secondary side January 23, 2006 2

SONGS Steam Generator January 23, 2006 3

Completion Status as of 01/23/2006

• Bobbin ECT Inspection - Complete

• +Point ECT Inspection 97% Complete

• In-Situ Testing - Pending

• Sleeving - Cancelled

• Plugging -Following In-Situ Note: Since exams are still in progress, all data and numbers in this presentation should be considered preliminary and subject to change.

January 23, 2006 4

Discussion Points (DP)

DP1) Discuss any trends in the amount of I primary-to-secondary leakage observed during the recently completed cycle.

- No primary-to-secondary leakage was detected during the last operating cycle of this unit; trends are not applicable.

January 23, 2006 5

Discussion Points (DP) k- - 1 DP2) Discuss whether any secondary side pressure tests were performed during the outage and the associated results.

No secondary side pressure tests were planned since there was no primary-to-secondary leakage during operation.

January 23, 2006 6

Discussion Points (DP)

DP-3) Discuss any exceptions taken to the industry guidelines.

No exceptions to the industry guidelines were taken January 23, 2006 7

Discussion Points (DP)

DP-4) Description of Inspections Performed Bobbin Exam

- Full Length Exam of In-Service Tubes (100%)

Rotating Exams (+Point)

- Hot Leg top-of-tubesheet locations (100%) (Inspecting to TSH-1 3.00")

- Cold Leg top-of-tubesheet locations (20%) (Inspection to TSC-1 3.00")

plus tubes adjacent to tie rods and plus a 3-row peripheral tube pattern and a 2-tube pattern surrounding all new and previous eddy-current possible loose parts indications within 1 inch of the TTS.

- Rows 1-4 U-Bend Locations (100%)

- Rows 5-10 U-Bend Locations (20%)

- Installed Sleeves, Full-Length (100%)

- Hot Leg scallop bar supports (20%) (with surrounding hot leg square bend above the bar and one support elevation of tubing freespan below the bar)

- Special Interest Locations 8869 locations

- Non-quantifiable bobbin indications (I-Codes) - 744 locations

- Dents = 2 volts (100%) - 6247 locations

- Dings = 4 volts (100%) - 931 locations

- Tube wear at supports (100%) - 947 locations January 23, 2006 8

Discussion Points (DP) e DP-4) Visual inspection for foreign objects

-Visual inspection for foreign objects

- No sludge lancing this outage

- Loose part identified and retrieved in SG88

- SG89 identified no loose parts during ECT inspection January 23, 2006 9

DP-5) Inspection Results SG88 SG89 TSH Circ, Axial, Volumeric -84 -42 TSC Circ, Axial, Volumetric 0 0 Freespan Axial _2 _4 Tube Support Axial -29 -21 Tube Support Wear (>40% TW) -0 -0 Tube Support (Preventative) 923 Sleeves (Obstructed) -63 -35 Misc. - Obstructed U-Bend _ 1 0 Total Repairable Tubes -202 -111 January 23, 2006 10

nisculssior Points (iDP)

DP-5) SG 88 Top Indications by Voltage SG 88 TSH Top 2 Indications by Voltage Leak Pressure Row Col PP Volts ind Origin Elev Inch1 Length Depth PDA FLDA CA Test Test 27 33 1.16 SCI ID TSH -0.14 50 2.83 33 No No 35 49 1.12 SAI ID TSH -8.31 8.71 49 N/A No No SG 88 FS Top 2 Indications by Voltage Leak Pressure Row Col PP Volts Ind Origin Elev Inch1 Length Depth PDA FLDA CA Test Test 41 47 0.12 SAI N/A 01H 15.98 No No 85 123 0.28 SAI N/A 090 07 No No SG 88 EC Top 2 Indications by Voltage Leak Pressure Row Col PP Volts Ind Origin Elev Inch1 Length Depth PDA FLDA CA Test Test 130 124 1.44 SAI ID 06H 0.11 0.13 21 13.38 No No 31 113 1.16 SAI ID 06H 0.40 0.29 57 45.52 No No January 23, 2006 11

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DP-5) SG 89 Top Indications by Voltage SG 89 TSH Top 2 Indications by Voltage Leak Pressure Row Col PP Volts Ind Origin Eiev Inch1 Length Depth PDA FLDA CA Test Test App D App D 118 114 3.57 SAI ID TEH 3.24 0.4 92 78.74 Exempt Exempt 96 86 1.22 SAI ID TSH -11.9 0.18 39 N/A No No SG 89 FS Top 2 Indications by Voltage ___ _________

Leak Pressure Row Col PP Volts Ind Origin Elev Inch1 Length Depth PDA FLDA CA Test Test 59 103 0.25 SAI N/A 01H 5.02 No No 126 52 0.24 SAI N/A 06H 22.68 No No SG 89 EC Top 2 Indications by Voltage Leak Pressure Row Col PP Volts Ind Origin Elev Inch1 Length Depth PDA FLDA CA Test Test 91 35 1.64 SAI ID 05H 0.18 0.29 49 44.86 No No 87 25 1.6 SAI ID 04H 0.3 0.22 53 42.45 No No January 23, 2006 12

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DP-5) New Inspection Findings

• During the 2R14 inspection, no damage mechanisms that were new to SONGS-2 were detected o All mechanisms were previously detected and included in the degradation assessment and the operational assessment.

• Sleeve Inspection Results (Obs=Obstructed or Partially Obstructed)

Year 2004 2006 2006 2006 Installed Obs In-Service Obs %Obs 1999 0 128 4 3%

2000 0 141 1 1%

2002 10 101 42 42%

2004 N/A 164 51 31%

Total 10 534 98 18%

January 23, 2006 13

Discussion Points (DP)

DP-6) Repair/Plugging Plans o Repair

- All indications exceeding Technical Specification repair criteria

- All crack-like Indications

- Quantified (Percent) Wear Indications

• =25% At tube support locations Diagonal Bar Hot and Diagonal Bar Cold

• =30% At all other support locations

- Circumferentially oriented indications will be stabilized January 23, 2006 14

Discussion Points (DP)

DP-6) Repair/Plugging Plans Continued

• All Sleeves with obstructions will be plugged a All Sleeves installed during the 2002 and 2004 outages will be preventatively plugged January 23, 2006 15

Discussion Points (DP)

DP-7) In-situ Pressure Test and Tube Pull Plans

• Utilizing latest EPRI and CEOG guidelines for candidate selection and testing o All tubes meeting criteria will be tested

• No tubes have been selected to date this outage based on EPRI/CEOG screening criteria

• No tube pulls are planned based on inspection results

• May insitu pressure test tubes with obstructed sleeves that will not allow MRPC inspection of certain bobbin indications January 23, 2006 16

Discussion Points (DP)

DP-8) Schedule for SG Related Activities during Remainder of Current Outage

• 1125106: Complete Eddy Current

. 1 /26/06: Complete Any In-Situ Testing

• 2/06/06: Complete Repairs January 23, 2006 17

Discussion Points (DP)

DP=9) Discuss Loose Parts What Inspections are performed to detect loose parts?

- Secondary Side Visual Exam

- 100% Bobbin Probe

- 100% TSH with rotating +Point

- 20% TSC with rotating +Point Plus a 3 row tube pattern on each side of the blowdown lane and around the peripheral annulus, plus a 2 tube pattern surrounding all new and previous possible loose parts eddy current inspections.

January 23, 2006 18

Discussion Points (DP)

DP9) Discuss Loose Parts

• A description of any loose parts detected and their location within the SG

- One loose part, small, thin strip of metal (responds to magnet),

with eroded edges. Approx. 2.25 inches long, 0.03 inch thickness, with width tapering from 0.25 inches to 0.75 inches

- Location: SG 88, Hot Leg TTS peripheral annulus

• If the loose parts were removed from the SG

-Yes e Indications of the tube damage associated with the loose parts

- None o Source or nature of the loose parts, if known

- Indistinguishable debris January 23, 2006 19