Document: NUREG-0800
Document ID: f209621d-e334-4866-bbfa-78bca86bd44d
Document Type: srp
Title: PRESSURIZER RELIEF TANK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550003.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.11
CFR Part: 
CFR Title: 

Content:
ry I boundaries. 2. The staff uses the following specific criteria to determine whether the requirements of GDC 4 are met: A. The rupture disks have a relief capacity that at least equals the combined capacity of the pressurizer relief and safety valves, with sufficient allowance for rupture disk tolerance. B. The pressurizer relief tank volume and the quantity of water initially stored in the tank should be such that no steam or water will be released to containment under any normal operating conditions or AOOs. It should be assumed that the initial temperature of water inside the tank will be no lower than 49 EC (120 EF). Systems performing similar functions should also be shown to have no release to containment during normal operations and AOOs. C. The design of the pressurizer relief tank and rupture disk should accommodate full vacuum so that the tank will not collapse if the contents are cooled after a discharge of steam without the addition of nitrogen. 5.4.11-5 Revision 3 - March 2007 D. Alarms for high temperature, high pressure, and high and low liquid levels for the pressurizer relief tank have been provided. Systems performing similar functions should also have appropriate instrumentation to inform the operator about the condition of the systems. E. The location of the tank should be such that the rupture discs do not pose a missile threat to safety-related equipment. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. Compliance with GDC 2 requires that the design of SSCs important to safety will withstand the effects of expected natural phenomena, combined with the appropriate effects of normal and accident conditions, without losing the capability to perform their safety functions. The design of nonsafety-related equipment, such as the pressurizer relief tank, should be consistent with this objective. GDC 2 applies to