Document: NUREG-0800
Document ID: 506e7738-a99e-48a1-ab15-8e713f61d17f
Document Type: srp
Title: TURBINE BYPASS SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350085.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.4
CFR Part: 
CFR Title: 

Content:
ion between the TBS capacity and relief valve capacity in terms of percentage of rated main steam flow, the maximum reactor power step change the system is designed to accommodate without a reactor or turbine trip, and the maximum electric load step change the reactor is designed to accommodate without reactor control rod motion or steam bypassing. 3. The reviewer uses engineering judgment and the results of failure modes and effects analyses to determine that: a. Failure of the TBS to operate will not preclude operation of any essential systems. Statements in the SAR that confirm the above are acceptable. b. Failure of the TBS high energy piping will not have adverse effects on any safety-related systems or components that may be located close to the system. IV. EVALUATION FINDINGS The reviewer determines that sufficient information has been provided and that the review supports conclusions of the following type, to be included in the staff's safety evaluation report: The turbine bypass system (TBS) includes all components and piping from the branch connection at the main steam system to the main condensers. The scope of review of the turbine bypass system for the plant included layout drawings, piping and instrumentation diagrams, and descriptive information for the TBS and auxiliary supporting systems that are essential to its operation. The basis for acceptance of the TBS in our review was conformance of the designs, design criteria, and design bases to the Commission's regulations as set forth in General Design Criteria (GDC) 4 and 34 of Appendix A to 10 CFR Part 50. 10.4.4-3 Rev. 2 - July 1981 1. The applicant has met the requirments of GDC 4 "Environmental and Missile Design Bases" with respect to the system being designed such that a safe shutdown will not be precluded as a result of the TBS failure. 2. The applicant has met the requirements of GDC 34 "Residual Heat Removal" with respect to the-ability to use the turbine bypass system for shutting down the