Document: NUREG-0800
Document ID: 0f072807-5b7f-4a13-85e3-594352505a7e
Document Type: srp
Title: TURBINE GENERATOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350054.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.2
CFR Part: 
CFR Title: 

Content:
vided that senses the turbine speed by magnetic pickup and closes all valves associated with speed control at approximately 112 percent of rated speed. This backup electrical overspeed trip system may utilize the same sensing techniques as the electro- hydraulic control system. However, the circuitry is reviewed to determine that the control signals from the two systems are isolated from and independent of one another. 3. The main steam stop, control, reheat stop, and intercept valving arrange- ments and valve closure times are reviewed to ensure that no single valve failure can disable the overspeed control function. 4. The extraction steam valving arrangements and valve closure times are reviewed to see that stable turbine operation will result after a TGS trip. 5. The capability for testing of essential components during TGS operation is reviewed. 6. The proposed inservice inspection program for essential speed control valves is reviewed to verify that it includes the provisions of item 5 of subsection II of this SRP section. 7. The RAB reviews the expected radiation levels around the TGS and the degree of access to TGS components during operation and the MEB reviews the quality and seismic classification as indicated in subsection I of this SRP section. 8. If there are safety-related systems or portions of systems located close to the TGS, the physical layout of the system is reviewed to assure that protection has been provided from the effects of high and moderate energy TGS piping failures or failure of the connections from the low pressure turbine section of the main condenser. The means of providing such pro- tection will be given in Section 3.6 of the SAR, and the procedures for reviewing this information are given in the corresponding SRP Sections. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and his review supports conclusions of the following type, to be included in the staff's Safety Evaluation Report: The