Document: NUREG-0800
Document ID: 45eeca5d-838e-41bb-9ab1-5681c845852e
Document Type: srp
Title: TURBINE GENERATOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380204.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.2
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Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of power conversion systems Secondary - None I. AREAS OF REVIEW Nuclear reactor plants include a turbine generator system (TGS) to convert the energy in steam from the nuclear steam supply system into electrical energy. The TGS consists essentially of (1) the turbine unit and the automatic devices, alarms, and trips that control and regulate turbine action and (2) the generator unit and its controls. The turbine control system, steam inlet stop and control valves, low-pressure turbine steam intercept and inlet control valves, and extraction steam control valves control the speed of the turbine under normal and abnormal conditions and are thus related to the overall safe operation of the plant. The TGS installed in a nuclear plant is typically equipped with redundant overspeed protection instrumentation and controls. The main steam and reheat steam control and stop valving arrangements typically provide redundancy in the valves essential for overspeed protection. The intent of the review under this SRP section is to verify that such redundancy, in conjunction with inservice inspection and testing of the essential valves, makes a turbine overspeed condition that exceeds the design overspeed very unlikely and to ensure conformance with General Design Criterion (GDC) 4. 10.2-2 Revision 3 - March 2007 The specific areas of review are as follows: 1. The TGS and the components and subsystems are normally provided with equipment with respect to the following considerations: A. The general arrangement of the turbine and associated equipment with respect to safety-related structures and systems and balance of plant B. The types and locations of main steam stop and control valves, reheat stop and intercept valves, and associated piping arrangements C. The capability of the turbine generator control and overspeed protection systems to detect a turbine overspeed condition and to actuate appropriate system