Document: NUREG-0800
Document ID: 8f36358d-8e5e-4f79-a3ea-ce1e8cf349bf
Document Type: srp
Title: PRESSURIZER RELIEF TANK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340639.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.11
CFR Part: 
CFR Title: 

Content:
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 pres- surizer 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 proper system operation. The RSB will verify the mass and energy blowdown data 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 assure function of required components, traces the availability of 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 safety-related systems, will not as a result of their failure preclude essential operations of these safety systems. Reference to the general arrangement and layout drawings for structures and systems will be necessary. 7. The reviewer