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:
other plant systems (the design of the tank system should be such that the plant safety-related systems would not be endangeredcontinue to perform their safety function in the event of a tank failure) and position C.3 regarding the extension of seismic 19 Category I boundaries. 2. General Design Criterion 4 (GDC 4), as it relates to a failure of the system resulting in 20 missiles or adverse environmental conditions that could result in unnecessary damage to safety-related systems or components. The following specific criteria are used to determine if the requirements of GDC 4 are met: a. The rupture disks have a relief capacity at least equal to 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 anticipated operationalabnormal21 occurrences. The initial temperature of water inside the tank should be assumed 22 to be no lower than 120 F49 C (120 F).23 c. The pressurizer relief tank and rupture disk should be designed for full vacuum so that the collapse of the tank will not occur if the contents are cooled following a discharge of steam without the addition of nitrogen. d. High temperature, high pressure, high and low liquid level alarms for the pressurizer relief tank have been provided. DRAFT Rev. 3 - April 1996 5.4.11-4 e. The tank should be located in such a manner that the rupture discs are not a missile threat to safety-related equipment. Technical Rationale The technical rationale for application of these acceptance criteria to reviewing the pressurizer relief tank is discussed in the following paragraphs:24 A. Compliance with GDC 2 requires that systems, structures, and components important to safety be designed to withstand the effects of expected natural phenomena, combined with the