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:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of reactor thermal-hydraulic systems in pressurized-water reactors Secondary - None I. AREAS OF REVIEW The typical pressurized-water reactor (PWR) primary systems include a pressurizer relief tank (a pressure vessel) to condense and cool the discharge from the pressurizer safety and relief valves. Discharges from small relief valves located inside the containment may also be piped to the tank. Tank capacity is based on a requirement to absorb the pressurizer discharge during a specified step load decrease. Not all PWR primary systems contain a pressurizer relief tank. However, all PWR pressurizers are expected to have one or more sources of effluent during normal operations, anticipated operational occurrences (AOOs), or accident events. That effluent must be routed away from the pressurizer to appropriate locations. To that end, all PWR primary systems are expected to have one or more components and/or systems that perform functions similar to those of the pressurizer relief tank system, as described herein. The staff should review those components and/or systems in accordance with this section, to the extent practical. 5.4.11-2 Revision 4 - May 2010 The review of the pressurizer relief tank, as described in the applicant=s safety analysis report (SAR), includes the tank, piping connections from the tank to the pressurizer relief and safety valves, tank spray system and associated piping, nitrogen supply piping, and piping leaving the tank to the cover gas analyzer and to the reactor coolant drain tank. The pressurizer relief tank system is nonsafety related; the review focuses primarily on ensuring, in accordance with applicable criteria, that its operation is consistent with transient analyses of related systems and that a failure or malfunction of the system could not adversely affect essential systems or components. The specific areas of review are as follows: 1. Review of the seismic