ML082750387

Enclosure 2 Meeting Slides

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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Pi :E :E U. o Receive NRC Submit EPU Approval of to NRC MELLLA+

(if pursued)

RFO 13 t,

Receive NRC Approval of ARTS/MELLLA Start EPU it conceptual LLLA phase C Submit MELLLA+ to commen NRC how to a 1200/00L 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 and EPU rated core flow = 108.5 Mlbm/hr

• CLTP and EPU operating dome pressure = 1035 psia

• 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 MSL Dryer Type EPU MSL Branch Velocity Velocity Ops Line OLTP EPU Ft/sec Ft/sec 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% none OLTP 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

- Plan to address IGSCC impact on FIV analysis 24