Document: NUREG-0800
Document ID: a2aa41aa-b86d-4157-91c2-f5d60d02c61c
Document Type: srp
Title: PRESSURIZER RELIEF TANK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100700178.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.11
CFR Part: 
CFR Title: 

Content:
or step load decreases. 2. The staff reviews the SAR to verify that the rupture disks on the relief tank have a relief capacity that at least equals 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 to prevent tank collapse if the contents are cooled after a discharge without the addition of nitrogen. 3. The staff reviews the pressure suppression capability of the system to ensure proper system operation. The reviewer verifies the mass and energy blowdown data, including rate of energy release, to evaluate the above effects. 4. The staff reviews the piping and instrumentation diagrams to verify that alarms for high temperature and pressure and alarms for high and low liquid levels 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 ensure the function of required components, traces the availability of these components on system drawings, and confirms that the SAR information includes 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 is acceptable if minimum system requirements are met. 6. The reviewer determines that a failure of the pressurizer relief tank systems or portions of the systems located close to safety-related systems will not preclude essential operations of these safety systems. Reference to the general arrangement and layout drawings for structures and systems will be necessary. 5.4.11-7 Revision 4 - May 2010 7. The