Document: NUREG-0800
Document ID: d7254cf8-c034-434f-b7d8-6eb96075d286
Document Type: srp
Title: PRESSURIZER RELIEF TANK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070439.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.11
CFR Part: 
CFR Title: 

Content:
early delineate system operation and the system capability to accept the steam flow released from the pressurizer for step load decreases. 2. The SAR is reviewed to determine that the rupture disks on the relief tank have a relief capacity at least equal to the combined capacity of the pressurizer relief and safety valves. The reviewer determines that the tank design pressure provides a conservative margin above the calculated pressure resulting from the maximum design relief and safety valve discharge, i.e., the maximum surge resulting from complete loss of load. The reviewer verifies that the tank and rupture disks are designed for full vacuum, so as to prevent tank collapse if the contents are cooled following a discharge without nitrogen being added. 3. The pressure suppression capability of the system is reviewed to assure ensure proper 29 system operation. The RSBSRXB will verify the mass and energy blowdown data 30 including rate of energy release to evaluate the above effects. 4. The piping and instrumentation diagrams are reviewed to verify that high temperature and pressure alarms and high and low liquid level alarms have been provided for the pressurizer relief tank. 5. The reviewer verifies that the system will function following anticipated abnormal occurrences. The reviewer evaluates the failure modes and effects analysis presented in the SAR to assureensure function of required components, traces the availability of 31 these components on system drawings, and checks that the SAR information contains verification that minimum system flow and heat transfer requirements are met for each degraded situation over the required time spans. For each case, the design will be acceptable if minimum system requirements are met. 6. The reviewer determines that failure of the pressurizer relief tank system or portions of the system not designed to seismic Category I, and which are located close to 32 safety-related systems, will not as a result of their failure