Document: NUREG-0800
Document ID: eb937958-fe7c-410a-91e3-63f04734878a
Document Type: srp
Title: MAIN STEAM ISOLATION VALVE LEAKAGE CONTROL SYSTEM (BMR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350465.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.7
CFR Part: 
CFR Title: 

Content:
o the extent practicable and complete functional testing during plant shutdown. f. The capability of the system and main steam supply system components to withstand effects resulting from the use of a sealing medium, if any, such as thermal stresses, pressures associated with flashing, and thermal deformations, so that the structural integrity of the main steam lines and main steam isolation valves will not be affected and that any deformation of valve internals will not result in exces- sive leakage from or through the valves. g. The design provisions incorporated to prevent or treat main steam isolation valve stem packing leakage or other direct leakage. h. The instrumentation and control features necessary to accomplish the system function, including isolation of components of the system in the event of malfunctions. i. The need for a third main steam shutoff valve in each main steam line upstream of the turbine stop valve to assure the safety function of the MSIVLCS. 3. ASB also performs the following reviews under the SRP sections indicated: a. Review for flood protection is performed under SRP Section 3.4.1. b. Review of the protection against internally generated missiles is performed under SRP Section 3.5.1.1. c. Review of the structures, systems, and components to be protected against externally generated missiles is performed under SRP Section 3.5.2. d. Review of protection against pipe breaks is performed under SRP Section 3.6.1. 6.7-2 Rev. 2 - July 1981 Related review evaluations will be performed by other branches and the results will be coordinated by ASB to complete the overall evaluation of the system. The evaluations provided by other branches are as follows. The Structural Engineering Branch (SEB) determines the acceptability of the design analyses, procedures, and criteria used to establish the ability of seismic Category I structures housing the system and supporting systems to withstand the effects of natural phenomena such as the safe shutdown