Document: NUREG-0800
Document ID: fd06ef1f-75ea-4f29-9779-8714e92f3050
Document Type: srp
Title: MAIN STEAM ISOLATION VALVE LEAKAGE CONTROL SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070451.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.7
CFR Part: 
CFR Title: 

Content:
stem. b. The failure of nonseismic Category I equipment or components will not have an adverse effect on the ability of the system or components to function. c. The capability of the system to perform its intended safety function is maintained assuming a single active failure of a main steam line isolation valve. 2. The ASB SPLB also reviews the design of the leakage control system with respect to the 6 following: a. The capability of the system to withstand the effects of the safe shutdown earthquake SSE, including the source of sealing medium, if any. 7 b. The capability of the system to control main steam isolation valve leakage and preserve containment integrity under design basis LOCA conditions, including loss of offsite power. c. The compatibility of initiation means and controls of the system with loading requirements on the emergency electrical buses, operator reaction times, and with actuation times available in view of the specific team isolation valve leakage limits. d. The requirements for interlocks to prevent inadvertent system operation. e. The capability of the system design to permit functional testing of components, controls, and actuation devices during power operations to 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 excessive 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. 6.7-3 DRAFT Rev. 3 - April 1996 h. The instrumentation and control features necessary to accomplish the system function,