SMRNRC_000030January 21, 2014

ENCLOSURE 4

Westinghouse Small Modular Reactor (SMR) Draft Slide Packages for the

Piping Introductory Meeting to be held on February 19, 2014

(Non-Proprietary)

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This document is the Non-Proprietary version.

AP1000 is a trademark or registered trademark of Westinghouse Electric Company LLC, its affiliates and/or itssubsidiaries in the United States of America and may be registered in other countries throughout the world. All

rights reserved. Unauthorized use is strictly prohibited. Other names may be trademarks of their respective owners.

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Agenda

1. Description of SMR Power Block and Nuclear Island

2. SMR Piping - Licensing Plan- Overview- Physical difference from the AP1000® plant- Leak Before Break (LBB)- Break Exclusion Zone (BEZ)- SMR Piping Philosophy

3. Closing Points

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Pressurizer (PZR) I

I Steam Generator (SG)0 Containment

Vessel (CV)I

I Reactor Vessel (RV) K

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Diesels

DID, HVAC,UHS Pools

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_Safety Trains

Spent Fuel

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( Seurity -R I - WithholdUnder•-Iso -10 -•-•i.,90)

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RCA/SFP

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Significant piping difference from the APIO00® plant

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Piping fil IIlss methd

Systems essential to shutdown are protected from piperuptures by applying the following methods:* Postulated piping failures* Pipe Rupture Hazard Analysis (PRHA)

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Leak Before Break (LBB) inside containment

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Lines considered for BEZ- Meet stress, inspection, anchor and weld requirements- Evaluated for a 1.0 square foot break for pressurization loads- Effects of flooding, spray wetting, and subcompartment

pressurization- Through-wall cracks are not postulated

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The methods and criteria used in the design and analysis ofthe ASME Code Classes 1, 2, and 3 piping are itemized inSMR DCD Table 3.9-19.

All SRP acceptance criteria are met.

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SMR system piping design will be confirmed and validated viaITAAC and not by DAC

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Questions?

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