ML082750387
| ML082750387 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 09/29/2008 |
| From: | Richard Guzman Plant Licensing Branch 1 |
| To: | |
| Guzman R | |
| References | |
| Download: ML082750387 (11) | |
Text
Nine Mile Point 2 Extended Power Uprate Impact on Steam Dryer NRC Meeting September 9, 2008 The way energy 'J\\,orks~~
Agenda
- Meeting Objectives
- EPU Project Schedule
- Plant Information
- Steam Dryer Overview
- BWRVIP Screening
- Acoustic Loads
- Dryer Stresses
- Remaining Open Issues z
Meeting Objectives
- Provide Status of Current Dryer Analysis
- Discuss NRC expectations for Steam Dryer Evaluation
- Discuss Remaining Open Steam Dryer Items
NMP2 EPU Timeline 2006 2007 2008 I
2009 I
2010 I
2011 I 2012_
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-c RFO 13 Receive NRC Approval of MELLLA+
(if pursued)
Submit MELLLA+ to NRC Submit EPU to NRC commen how to a 1200/00L Receive NRC Approval of ARTS/MELLLA it LLLA C
t, Start EPU conceptual phase 4
Plant Information
- Nine Mile Point Unit :2 GE BWR 5 Operating License in 1986 - 3323 MWt In 1995, uprated to 104.3% OLTP - 3467 MWt
- Extended Power Uprate to 120% OLTP - 3988 MWt
- CLTP rated main steam flow = 15.002 Mlbm/hr
- EPU rated main steam flow = 17.636 Mlbm/hr
- NMP2 has two constant speed recirculation pumps with flow control valves.
5
Steam Dryer Integrity Evaluation Methods
- NMP2 Steam dryer Integrity for Power Uprate based on the BWRVIP guidance
- BWRVIP-182 "Guidance for Demonstration of Steam Dryer Integrity for Power Uprate" BWRVIP-181 "Steam Dryer Repair Design Criteria" BWRVIP LTR "Methodologies for Demonstrating Steam Dryer Integrity for Power Uprate" BWRVIP-139 "Steam Dryer Inspection and Flaw Evaluation Guidelines" 6
Steam Dryer Information
- BWR-5 251 Curve Hood
- Figure 2-37 BWRVIP-139
- NMP2 design incorporates the structural reinforcements:
- Outer hood 0.5'" BWRVIP-139 figure 2-43
- Center outlet plenum 0.5"
- Tie Bars 2"x 2"
- Two sided fillet on middle and inner hood to end plate
- Inner hood reiniorcement strip (BWRVIP figure 2-44) in 2004
- Support lugs 011 RPV leveled prior to service 7
Steam Dryer Inspection Baseline
- NMP2 has completed the BWRVIP-139 baseline inspections for curved hood dryers
- IGSCC cracking identified
- Extent and location consistent with industry experience as noted in BWRVIP,-139 section 2
- The IGSCC has been evaluated as not structurally significant per BWRVIP-139 guidance.
- Consistent with BWRVIP-139 and BWRVIP-182 guidf1l1ce the impact of EPU loads on the cracking is evaluated.
Fatigue Flaw Identified in 2004 related to undersized weld at inner hood to end plate
- Location repaired in 2004 with reinforcement 8
Steam Dryer Comparison Overview MSL Velocity OLTP Ft/sec MSL Velocity EPU Ft/sec Dryer Type EPU Ops MSL Branch Line VY 140 168 Square 120% OLTP none QC 168 202 Square 117% OLTP none Mont 146 179 Square 120% OLTP none HC 141 167 Curved 116.6%
OLTP none Susq 128 153 Curved 120% OLTP Yes BF 1,2,3 135 CLTP 153 Slanted 120% OLTP Yes NMP2 143 177 Curved 120% OLTP none 9
Proprietary Information SLIDES 11 through 23 CONTAIN COl and BWRVIP PROPRIETARY INFORMATION 10
Summary
- Status of Current Dryer Analysis
- NRC expectations for Steam Dryer Evaluation
- Complete Steam dyer evaluation consistent with BWRVIP-182 and BWRVIP LTR for CDI methods
- Resolution of Open Steam Dryer Items
- Plan to submit with a alternating stress margin of >2