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1 This document is the property of and contains Proprietary Information owned by Westinghouse Electric Company LLC and/or its subcontractors and suppliers. It is transmitted to you in confidence and trust, and you agree to treat this document in strict accordance with the terms and conditions of the agreement under which it was provided to you. 1

2 Westinghouse Non-Proprietary Class 3 Westinghouse AP1000 Classification of Systems, Structures and Components (SSC) Jurie van Wyk Small Modular Reactor Development April NESCC Meeting, Washington DC 2

3 SCC Classification Basis Documents A 51.1 Nuclear Safety Criteria NRC Regulatory Guide 1.26 Quality Group Classification NRC Regulatory Guide 1.29 Seismic Design Classification NRC Regulatory Guide 1.97 Criteria for Accident Monitoring AP1000 DCD Chapter 3.2: 3 Leverage the knowledge of existing fleets and AP1000 for the historical classification basis on SSC s

4 Safety-related function Basis of A 51.1 Safety Related Functions are provided during or following a design basis event: Integrity of the reactor coolant pressure boundary Capability to shut down the reactor and maintain shut down Capability to prevent or mitigate the consequences of accidents that could result in potential offsite exposures comparable to the guideline exposures of 10 CFR The three basic safety related functions 4

5 Seismic Classification (Regulatory Guide 1.29) Seismic Category I SSC that perform safety related function SSC that support or protect SSC s with safety related function Seismic Category II (Westinghouse class) SSC designed to prevent their collapse under the safe shutdown earthquake SSC to preclude their structural failure during a safe shutdown earthquake or interaction with Seismic Category I items which could degrade the functioning of a safety-related SSC to an unacceptable level, or could result in incapacitating injury to occupants of the main control room. Non Seismic Class - Follow Uniform Building Code Westinghouse Seismic Class II criterion is in conformance with the definition of Regulatory Guide

6 Purpose Westinghouse SMR(AP1000) Classification System The classification system provides how SSC relate to Safety related function and seismic classification Quality Group classification related to codes and standards The classification system provides how SSC related to: A nuclear safety classification NRC quality groups, ASME Code, Section III classification, Electrical and other applicable industry standards Test and Inspection Maintenance requirements Clear relation between SSC safety function and their quality requirement 6

7 Westinghouse AP1000 or SME Safety Classification Equipment Class A Same as A 51.1 Safety Class 1 Most Passive Safety components received this classification (Core make up tank, ADS valves etc..) Equipment Class B Same as A 51.1 Safety Class 2 Equipment Class C Same as A 51.1 Safety Class 3 Equipment Class D Same as A 51.1 Non Nuclear Safety Class SSC that directly acts to prevent unnecessary actuation of the passive safety systems which support those which directly act to prevent the actuation of passive safety systems Equipment Class E,F,G,L,P,R,W - Same as A 51.1 None Nuclear Safety Related Class. NRC Approved the Passive Safety Approach in the AP1000 DCD 7

8 Westinghouse AP1000 or SME Comparison of Safety Classification Requirements COMPARISON OF SAFETY CLASSIFICATION REQUIREMENTS AP1000 Code Letter A Equipment Safety Class RG 1.29 Seismic Design Reqmnts ASME Code, Sec. III Class IEEE Requirements RG 1.26 NRC Quality Group 10 CFR 50 Appendix B Inspection & Testing Requirements Required Test & Maint. A SC-1 I 1 NA GROUP A YES YES T+A B SC-2 I 2 NA GROUP B YES YES T+A C SC-3 I 3 1E GROUP C YES YES T+A D N II or ASME VIII C37 GROUP D YES or NO YES A E,F,L P,R,W N II or NA NA NA YES or NO NA NA Seismic 1&II follow ASCE Standard 4-98 or IEEE-344 follow UBC T= Tech Specs (ASME XI) A= Administrative Reliability Assurance Program Safety Classifications are related to quality standards based on their function 8

9 SMR Classification Requirements Structures SEISMIC CLASSIFICATION OF BUILDING STRUCTURES Structure Nuclear Island Basemat Containment Interior Shield Building Auxiliary Building Containment Air Baffle Containment Vessel Plant Vent and Stair Structure Turbine Building First bay adjacent to Nuclear Island outlined by Columns I.1 to R and to 11.2 Turbine Building All portions of Turbine Building except first bay adjacent to Nuclear Island as outlined by Columns H.05 to R and 12.1 to 20 Turbine Building Annex Building Area Outlined by Columns A - D and 8-13 Area Outlined by Columns A - G and Category C-I C-I C-II C-II Annex Building Area Outlined by Columns E - I.1 and 2-13 C-II Radwaste Building Diesel-Generator Building Circulating Water Pumphouse and Towers Category II prevent their collapse under the safe shutdown earthquake 9

10 SMR Classification Requirements System AP1000 CLASSIFICATION OF MECHANICAL AND FLUID SYSTEMS, COMPONENTS, AND EQUIPMENT Tag Number Description AP1000 Class Seismic Category Principal Construction Code Passive Containment Cooling System Location: Containment Shield Building and Auxiliary Building PCS-MT-05 Passive Containment Cooling D II API 650 Ancillary Water Storage Tank Comments PCS-PL-V001A PCCWST Isolation C I ASME III-3 PCS-PL-V047A/B PCS Recirculation Pump Discharge Isolation line D AI B16.34 Equipment Anchorage is Seismic Category II Passive Core Cooling System (PXS) Location: Containment PCS-PL-V004 Recirculation Bypass D AI B16.34 Equipment Anchorage is Seismic Category II PXS-PL-V015B CMT B Discharge Isolation A I ASME III-1 PXS-MT-03 In-Containment Refueling Water Storage Tank C I ACI 349/AISC N690 ACI 349 is used for Evaluation of Structural Boundary More than 75 pages of AP1000 component safety classifications to be used as basis for passive safety plants 10

11 Questions 11