ML081360308
| ML081360308 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 05/14/2008 |
| From: | Nuclear Management Co |
| To: | Office of Nuclear Reactor Regulation |
| Chawla M, NRR/DORL/LPL3-1, 301-415-8371 | |
| Shared Package | |
| ML081540286 | List: |
| References | |
| TAC MD8398 | |
| Download: ML081360308 (12) | |
Text
Agenda Objectives EPU Project Background License Amendment Request Format Items of interest Requested Change to Power Grid Stability Evaluation Containment Analysis Containment Overpressure (COP)
High Energy Line Breaks (HELB)
Steam Dryer Evaluation Startup Test Plan Monticello Schedule Open Discussion DVD Demonstration 1
Objectives Clarify requested license power versus EPU rated thermal power analysis Review items of interest in the submittal Demonstrate linked DVD EPU Project Background VIonticello Background
- Initial License (1970)
- 1670 MWt Original Licensed Thermal Power (OLTP)
- Extended Power Uprate (1998)
- 1775 MWt (-106% of OLTP)
- License Renewal Approved (November 8, 2006)
- Extended Power Uprate
- Constant Pressure Power Uprate (CPPU)*
- 1870 MWt (-112% of OLTP) in 2009 (
- 2004 MWt (120% of OLTP) in 2011 /
4 2
EPU Project Background EPU Project Goals
- Maintain or improve safety and risk profile
- Improve or enhance equipment reliability icense Amendment Request Format NMC EPU PUSAR* Format
- General Electric (GE) PUSAR reformatted to NRC Review Standard RS-001
- Regulatory evaluation and conclusion sections of the RS-001 safety evaluation templates are within the PUSAR
- Plant-specific licensing bases sections provided
/-
f K
K
- PUSAR is Power Uprate Safety Analysis Report 3
.icense Amendment Request Format Cover Letter
Enclosures:
1 - Evaluation of Proposed Changes 2 - Proposed TS Markups 3 - Proposed TS Bases Changes (for information) 4 - Environmental Assessment 5, 6, 7 - PUSAR (Proprietary, Affidavit, Non-Proprietary) 8 - Planned List of Modifications 9 - Startup Test Plan 10- Piping Flow Induced Vibration Monitoring Program 11, 12, 13 - Steam Dryer Dynamic Stress Evaluation (Proprietara Affidavit, Non-Proprietary) 14 - Grid Stability Evaluation Summary 15,- Identification of Risk Implications Due to EPU Items of Interest Requested Change to Power Grid Stability Evaluation Containment Analysis Containment Overpressure (COP)
High Energy Line Breaks (HELB)
Steam Dryer Evaluation Startup Test Plan 4
Items of Interest aquested Change to Power Licensed power of 1870 MWt Rated Thermal Power (RTP) redefined to cover analysis and plant operating parameters (2004 MWt)
Submittal for 2004 MWt when Midwest Independent System Operator (MISO) grid stability complete 9
Items of Interest
'id Stability Evaluation Results of the independent evaluation at 2004 MWt provided in LAR Results of the first MISO evaluation to NRC by June 30, 2008 (commitment)
Norking with MISO for the second evaluation to 2004 MWt 5
Items of Interest ontainment Analysis Credits the presence of passive containment heat sinks Varies residual heat removal (RHR) heat exchanger capability as a function of inlet fluid temperature 4ssumes mechanistic heat and mass transfer From the suppression pool surface to th/e wetwell---*,
airspace
/
Items of Interest
)ntainment Analysis Long-term containment analyses current icense basis performed using the GE SHEX code (with exception of station blackout (SBO))
EPU long-term containment analyses performed with GE SHEX code includingq 6
Items of Interest Dntainment Overpressure Emergency core cooling system (ECCS) low pressure pumps continue to require COP credit to satisfy pump net positive suction head (NPSH) requirements at EPU Requesting a 0.84 psi increase in maximum COP credit
- from 20.36 psia to 21.2 psia (5.66 psig to 6.5-psig)
-single value upper limit to bound all design'and licensing basis events K.
13 Items of Interest gh Energy Line Breaks EPU analysis provides bounding results Steam line breaks unchanged per CPPU methodology Liquid line break results are greater than a typical EPU due to methodology changes Affected equipment will be reanalyzed, requalified or replaced 14 7
Items of Interest
- am Dryer Evaluation lackground
- GE Square Hood Dryer
- Licensing basis accident is main steam line break outside of containment
- Inspections per BWRVIP 139
/
15 Items of Interest
)am Dryer Evaluation
- -valuation Approach
- Screening of susceptibility to acoustic excitation validated by scale model tests
- Strain gage measurements of current licensed thermal power (CLTP) main steam line acoustics
- Acoustic circuit model of steam dome
- Finite element model of dryer at CLTP and EZPU'--.
conditions.
- Limit curves for power ascension 16 8
Items of Interest
- am Dryer Evaluation Evaluation conclusions:
- Scale model tests are consistent with calculated results
- Acceptable stress ratio
- Highest stresses occur in the cover plate to hood welds as expected
- Startup test plan with dryer limit curves S17 Items of Interest
ýrtup Test Plan 3tandard Review Plan (SRP) 14.2.1 and GE icensing topical reports (LTRs) used as guides Derformed after each EPU implementation
)utage (2009 & 2011) 3aseline data taken at 90% and 100% CLTP, ollowed by power ascension in approximate
'..5% increments
(
)ata will be evaluated at each increment" 18 9
Items of Interest artup Test Plan Major Test Evolutions
- TS instrument surveillances
- Feedwater and reactor level and pressure control systems
- Steam dryer performance (moisture carryover) and integrity (structural)
- Main steam and feedwater vibration monitorin-
- Plant walk downs
-AP 19 Items of Interest artup Test Plan Major Test Evolutions (continued)
- Radiation measurement
- Other power dependent parameters
- Post modification operational testing integrated into the plan
- Large transient testing not required 10
Monticello Schedule 1
2008 2009 2010 2011
] FIV Monitoring Mods for EPU WSubmtittal PRNMS & Stability NRC Ration of PRNMI Option IN LAR Prop
& Stability Option III V
Submittal and mrNRC Review oEP
~1870 MWt DFIV Monitoring V NRC Approval nFIV monitoring
-TNRC Approval V Submttl NRC NRC Revlew of Approval I DS-D tall y NRC Review Approval V Submittal V
NRC ME[LL NRC l-
]
Approval A PtNMS installatlon & EPU Phase I A u" Pnsa uplementation dule is still being determined.
Open Discussion Questions Feedback 22 11
DVD Demonstration Facilitate review Precedent Demonstration
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