ML14147A415

Slide for 5/29/14 Meeting Re. Fuel Transition Project

ML14147A415
Person / Time
Site:	Saint Lucie
Issue date:	05/29/2014
From:	Nextera Energy
To:	Audrey Klett Plant Licensing Branch II
Klett A
References
Download: ML14147A415 (10)

Text

St. Lucie Unit 2 Fuel Transition Project Fuel Transition Project May 29 2014 May 29, 2014

Agenda Purpose Fuel Mechanical Design Fuel Mechanical Design Fuel Rod Design and Fuel Performance Neutronics Design/Thermal Hydraulic Analysis Safety Analysis LAR Contents Key Milestones Key Milestones Summary/Conclusions 2

Purpose The purpose of this meeting is to provide an overview of the planned transition to the AREVA HTP fuel design at St. Lucie Unit 2 with proposed schedule for license amendment request submittal schedule for license amendment request submittal and requested approval.

3

Fuel Mechanical Design AREVA HTP fuel design CE 16x16 HTP O

ll bl di i

i il t

th t St L i

U it 2 f l

Overall assembly dimensions similar to the current St. Lucie Unit 2 fuel HTP grid design MONOBLOC guide tube M5 f l

d l ddi M5 fuel rod cladding.

Improved resistance to grid-to-rod fretting, as compared to the current St. Lucie Unit 2 fuel design The AREVA HTP design has operated successfully in St. Lucie Unit 1 (8 g

p y

(

completed cycles with no failures in HTP fuel)

Other operating experience Significant successful operating history of base HTP design in B&W 15x15 plants, Westinghouse 15x15 and 17x17 plants, and CE 14x14, 15x15, and 16x16 plants in the US, as well as worldwide experience A comparable CE 16x16 HTP design recently completed 3 successful cycles of Lead Assembly operation 4

y p

Fuel Rod Design and Fuel Performance Fuel rod design will use AREVA methodology and review criteria g

criteria

- Rod design uses NRC approved methods based on RODEX2 (modified to account for TCD impact)

- Structural design uses standard approved AREVA methods to

- Structural design uses standard approved AREVA methods to show compliance to approved criteria

- Full seismic/LOCA evaluation for BOL and EOL conditions using BAW-10133P-A for lateral loads (modified for EOL grid strength) and 1-D model for vertical loads Fuel performance analysis uses cycle designs, typical of expected actual operating cycles p

p g y Advanced M5 fuel rod cladding - low corrosion properties, extensive worldwide operating history 5

Neutronics Design & TH Analyses Core/Neutronics Design g

y

- The core design methodology unchanged from the current Westinghouse methodology used for St. Lucie Unit 2 (ANC/PHOENIX)

- Westinghouse physics methodology to be used with AREVA safety analysis codes similar to current method used for St Lucie Unit 1 analysis codes - similar to current method used for St. Lucie Unit 1 Thermal Hydraulic Analysis

- T&H analysis done with AREVA approved methodology

- Mixed core effects addressed

- No changes to COLR limits expected 6

Safety Analysis Non-LOCA Analyses Safety Analysis

- Use of S-RELAP5 methodology as modified and approved for St. Lucie Unit 1 as part of recent EPU approval

- DNB/FCM-related events will be submitted to the NRC as part of fuel t

iti LAR transition LAR SBLOCA Analysis

- Use of S-RELAP5 based SBLOCA methodology as modified and approved for St. Lucie Unit 1 RLBLOCA Analysis

- Use of RLBLOCA methodology with Transition Package and changes gy g

g approved for St. Lucie Unit 1 7

Contents of LAR Tech Spec changes M5 cladding

- M5 cladding

- AREVA methodology

- Limit Lines Fuel mechanical design & analysis description T&H analysis, including fuel compatibility (mixed core effects)

Selected Non LOCA analysis (affected by fuel design change)

Selected Non-LOCA analysis (affected by fuel design change)

SBLOCA summary report RLBLOCA summary report M5 Cladding 10 CFR 50.46 and 10 CFR 50 Appendix K Exemption Request (similar to recent St. Lucie Unit 1 submittal) 8

Key Milestones Initial NRC meeting May 2014 Pre-submittal meeting October/November 2014 License amendment request & M5 exemption request submittal December 2014 Post-submittal meeting as needed SER request date 1Q 2016 Initial fuel delivery 1Q 2017 y

Current schedule for Cycle 23 startup March 2017 9

Summary

• Summary Minimal TS changes M5 l ddi M5 cladding AREVA methodology Limit lines supporting new DNB correlation N

h i

t i

th d l No change in neutronics methodology Safety analysis methodology - same as previously approved and currently used for St. Lucie Unit 1 M5 Exemption - previously approved by NRC for other utilities and St. Lucie Unit 1 M5 Exemption previously approved by NRC for other utilities and St. Lucie Unit 1 Lessons learned from recent AREVA fuel transitions, and St. Lucie Unit 1 EPU, incorporated in the transition work

• Operational Benefits Improved fuel reliability - grid-to-rod fretting resistant HTP fuel design 10