ML042720488
| ML042720488 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 09/20/2004 |
| From: | NRC/NRR/DLPM/LPD2 |
| To: | Florida Power & Light Co |
| Arroyo J, NRR/DLPM, 301-415-2149 | |
| Shared Package | |
| ML042720215 | List: |
| References | |
| TAC MC4084 | |
| Download: ML042720488 (11) | |
Text
C* Update September 20, 2004 Revised C* Report To be Completed in October.
Provides Tubesheet Region Inspection Lengths for CE-designed Units Based on Conservative Methodology Previously Submitted to NRC by SCE/APS Addresses NRC RAls on CE-designed Units C* Participants Available to Meet with NRC Staff in early November 1
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004
- NRR, WHITE FLINT FLORIDA POWER & LIGHT ST. LUCIE UNIT 2 STEAM GENERATOR INSPECTION PLANNING NRR - WHITE FLINT SEPTEMBER 20, 2004
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT AGENDA
. Purpose of Meeting
. Background
- SI2-15 Inspection Scope
. Projected Tube Plugging
- Operating Experience
- Contingency Planning
- Summary & Closing I
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT Purpose of Meeting
. Review SL2 S/G Condition
- Review SL2-15 Inspection Plans a GL 2004-01 Response a Address Staff Concerns 2
1
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT
Background
S/G Design CE Model 3410 8411 Tubes/ SG
-18.3 EFPY @ SL2-15 A-600 HTMA Tubing CS Lattice Support System Tubesheet Joint - Explosive Total Tubes Plugged SG A -671 (8.0%)
SG B - 872 (10.4%)
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STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT
Background
FPL Steam Generator Program
- Committed to Safe Operation
- Full Implementation of NEI 97-06, S/G Program Guidelines
'Inspection
'Chemistry
'Leak Monitoring
- Incorporate Industry Experience
- Extensive Examination History at Unit 2
- Conservative Approach
' In Situ Pressure Test at Last 5 Inspections 4
2
STEAM GENERATOR INSPECTION PLANNING STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT
Background
. Last Inspection - SL2-14 in April 2003
- Results Discussed with NRR During Outage
' Most Damage Mechanisms as Expected
' No ODSCC in Dings
' PWSCC in Tubesheet Limited and Confined to Upper 2'
'Increase in Axial ODSCC at Eggcrate Supports
'Degradation Trend Typical for Unit with A-600 MA Tubing 5
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004-NRR, WHITE FLINT
Background
Summary of PSL-2 Indication Counts (April 2003)
Mechanism Number of Indicators SVG A S/GC B
Total Axial ODSCC at Eoqcrates 222 441 663 Axial ODSCC at Dlaoonal Straps 0
2 2
Axial ODSCC at Dinrls 0
0 0
Axial ODSCC In Freespans (2) 1 0
1 Axial OSCC atTubesheet (Hot) 17 14 31 Axial IDSCC below Tubesheet (Hot) 6 2
8 Circumferential ODSCC at Tubesheet (Hot) 3 7
10 Circumferential Indications below Expansion Transition 0
0 0
OD Volumetric at Tubesheet (Hot)'"'
0 2
2 Wear at Tubesheet (Cold) 5 1
6 Wear at Diaconawertical and Epocrate Supports 695 478 1173 Notes:
- 1. Two Indicators detected at bat wing supports were evaluated In combination with eggcrate indications.
- 2. Single Indication detected In freespan was evaluated in combination with eggcrate Indications.
- 3. Volumetric Indications are attributed to loose part wear. These indications were evaluated in combination with top-of-tubesheet wear Indications.
6 3
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT
Background
Tube Plugging by Mechanism (1)
ODSCC at Eggcrates Wear at Tube Supports ODSCC at Top of Tubesheet Preservice, FO Wear, Preventative Circ. ODSCC at Top of Tubesheet OD Volumetric - Various IDSCC Below Top of Tubesheet ODSCC at Dings ODSCC in Freespan Cumulative Plugging Cumulative Percent 4100 11/01 14 259 18 11 16 19 51 5
13 2
1 1
5 54 361 4/03 482(2) 27 6
10 4
1 530 652 1013 1543 3.9%
6.0%
9.2%
(1) Axial unless noted otherwise.
(2) Includes 2 indications at Diagonal Strap.
7 STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004-NRR, WHITE FLINT
Background
In Situ Pressure Testing Through SL2-14
- 54 Total Indications
- Mechanisms Include
'Axial ODSCC at Eggcrates
'Axial ODSCC at Dings
'Axial ODSCC at TTS
'Axial IDSCC below TTS
'Circ ODSCC at TTS
'OD Volumetric TTS No Leakage or Burst 8
4
c N STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT SL2-15 Inspection Scope nVisual Examination of All Tube Plugs oBobbin Probe All Active Tubes
' Screen Dings <5 Volts in Straight Sections
' Full Length Row 3-140, Straight Length Row 1-2
.Plus Point Probe
' 100% Hot Leg Top of Tubesheet (+37/- WCAP Value)
' Cold Leg Periphery Tubes for FO Damage (+3./-2')
' 35% Row 1-2 U-bends (-40/SG) 100% Wear Scars at Eggcrates & HL Diagonal (A-1 18. B-84)
> 20% Wear Scars at U-bends & CL Diagonal (A-11l. B-73)
' All Tubes with No Tube Expansion (A-22 B-1) 9 J
o
-STEAM GENERATOR INSPECTION PLANNING S-L2-15 NOVEMBER 2004 - NRR, WHITE FLINT SL2-15 Inspection Scope (con't)
- Plus Point Probe for Dings MA SGB
' All Dings Hot Leg Tubesheet to 1 st Support 43 24
' All Dings >5 volts 1st Support to HL Bend 98 77
' All Dings in HL & CL Square Bends Row 19-140 68 54
' All Dings >5 volts in Horizontal Run Row 19-140 97 107
' All Dings in Rows 1-18 U-Bends 140 104
' 20% Dings >5 volts CL Tubesheet to CL Bend 26 23 472 389
- In Situ Testing Based on Industry Screening Guidance 10 5
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT Projected Tube Plugging NMbh iocaon Axal OSCC at Egcrate Supports dMa ODSC00 at Top d Tdsheet OaurTferenhal OCSOC at Ewansion TrarUias Adal COSCCat Dirgs Adal lDS0C Below Secrdy Faze d Tbesheet TOTAL PFUECTED Predicted nt&er S12-15 700-1100 30-50 10-20 5-10 5-10 750-1190 11 STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004-NRR, WHITE FLINT Operating Experience
- Continue Emphasis on Dings/Dents &
Anomalous Indications
- Foreign Object Damage
- U-Bend Cracking
- Coverage of Auto Analysis
- Tube to Tube Wear (Tube Sever Potential)
- Wear Progression Analysis Completed for Plugged Tubes
- 49 Locations Susceptible to Tube-to-Tube Contact <SL2-17
- Susceptible Locations to be Reviewed by Lead Analysts 12 6
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT Contingency Planning Issue or Inspection Item Leaking Plug Crack In Row 1 &2 U-bend Crack In U-bend Wear Scar Crack in Cold Leg Ding Foreign Object Wear CL Expansion Transition Cracking Freespan Cracking Continaency Action Replace as Necessary Test 100% Affected Rows
& 20% Row 3, etc.
Test All (A-450, B-300)
Test All (A.-104, B-92)
Bound FO Wear Test 100% In Affected SG Validate Bobbin POD 13 STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT Generic Letter 2004-01 FPL Program Complied with NEI 97-06 and Tech Specs for All Past Inspections
- Tubesheet Inspection Depth Not Challenged
' Cracking Limited to 2" Below Top of Tubesheet
' Inspections to 5" and 8" Below Top of Tubesheet
- Frequency & Extent of Cracking is Limited
- LAR to Redefine Inspection Depth Submitted Prior to SL2-14
' Withdrawn Based on Inspection Results and Discussions with NRC 14 7
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004-NRR, WHITE FLINT Generic Letter 2004-01 ID Axial Cracks Below Expansion Transition (1)
RFO Exam Exam No.
Maximum Depth Date Scope Depth IND Into Tubesheet 04-97 100%
-2" 1
-1.10" 11-98 100%
-2" 0
04-00 100%
2" 1
-0.17" 11-01 100%
5" 2(2)
-2.1 o" 04-03 100%
8" 8(3)
-1.89" (1) No ID circumferential indications reported below transition (2) Only one tube affected (3) Only four tubes affected i5 STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT Generic Letter 2004-01
- Planning for SL2-15 Inspection
' Assumptions on Distribution of Degradation in Tubesheet Challenged by Recent Inspection Results
' Need to Redefine Tube Inspection Depth and Plugging Limit
' Submit License Amendment Request e Follow Guidance in GL 2004-01
- Tube Inspection & Plugging Limit Definitions
- Inspection Depth Based on WCAP
- New WCAP to Address NRC Comments
- May Request Expedited License Amendment Approval 16 8
STEAM GENERATOR INSPECTION PLANNING SL2-15 NOVEMBER 2004 - NRR, WHITE FLINT Summary & Closing
- FPL Program Meets Industry Guidance
- Reasonable Assurance of Tube Integrity
. Compliance with Tech Spec & NRC Position
. Amend License Consistent with GL 2004-01
. Identify & Address Staff Concerns 17 9