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:
accidents or to mitigate the consequences of an accident. Therefore, the design of the pressurizer relief tank system is acceptable if the integrated system design is in accordance with the following criteria: 1. General Design Criterion 2, as it relates to the protection of essential systems from the effects of earthquakes. Acceptance is based on meeting the guidelines of Regulatory Guide 1.29, position C.2, with regard to the location of the tank in relation to other plant systems should be such that the plant safety-related systems would not be endangered in the event of a tank failure and position C.3 regarding the extension of seismic Category I boundaries. 5.4.11-2 Rev. 2 - July 1981 2. General Design Criterion 4, as it relates to a failure of the system resulting in 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 abnormal occurrences. The initial temperature of water inside tank should be assumed to be no lower than 120'F. 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. e. The tank should be located in such a manner that the rupture discs are not a missile threat to safety-related equipment. III. REVIEW