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:
eleases to the environment. The means for prevention or control need not be part of the leakage control system itself, but should meet the same design criteria. 7. The leakage control system design is reviewed to determine if a third main steam line valve, located between the main steam isolation valve and the turbine stop valve, is required to assureensure that the MSIVLCS can perform its safety function following a design basis LOCA. 8. An acceptable alternative to providing an MSIVLCS involves taking credit for fission product plateout and holdup in the large volume and surface area of the main steam piping, main steam drain lines, turbine bypass line, and main condenser for controlling offsite consequences from leakage past steam line isolation valves in the event of a LOCA. If this alternative is proposed, the reviewer coordinates with SPLB reviews under other SRP sections and reviews of other branches as described in subsection I to verify that: a. offsite consequences of such an event are acceptable, b. appropriate components associated with the proposed fission product plateout and holdup path are seismic Category I or analyzed for SSE conditions, as applicable, and DRAFT Rev. 3 - April 1996 6.7-10 c. the classification of affected components subjects them to quality standards adequate to ensure performance of these functions.50 For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to verify that the design set forth in the standard safety analysis report, including inspections, tests, analysis, and acceptance criteria (ITAAC), site interface requirements and combined license action items, meet the acceptance criteria given in subsection II. SRP Section 14.3 (proposed) contains procedures for the review of certified design material (CDM) for the standard design, including the site parameters, interface criteria, and ITAAC.51 IV. EVALUATION