Document: NUREG-0800
Document ID: 16650158-402d-4897-850a-bc9e2cce7648
Document Type: srp
Title: INADVERTENT OPENING OF A PWR PRESSURIZER PRESSURE RELIEF
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070726.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.1
CFR Part: 
CFR Title: 

Content:
res that the reactor coolant system and associated auxiliary, control, and protection systems be designed with sufficient margin to ensure DRAFT Rev. 2 - April 1996 15.6.1-6 that the design conditions of the reactor coolant pressure boundary are not exceeded during any condition of normal operation, including anticipated operational occurrences. GDC 15 is applicable to this section because the reviewer evaluates the consequences of the inadvertent opening of a PWR pressurizer pressure relief valve or a BWR pressure relief valve (i.e., anticipated operational occurrences). Further, the reactor coolant pressure needs to be analyzed to ensure that the pressure acceptance criterion is satisfied. Meeting the requirements of GDC 15 provides assurance that the design conditions of the reactor coolant pressure boundary are not exceeded for the inadvertent opening of a PWR pressurizer pressure relief valve or a BWR pressure relief valve.44 3. Compliance with GDC 26 requires that reactivity control systems at nuclear power plants include control rods with the capability to control reactivity changes, thereby ensuring that specified acceptable fuel design limits are not exceeded under conditions of normal operation, including anticipated operational occurrences. The design for this system must have an appropriate margin to accommodate malfunctions such as stuck rods. GDC 26 is applicable to this section because the transient analyzed by the reviewer may involve the movement of control rods in response to the transient. In such instances, rod misalignment, including stuck rods, can produce more severe thermal-hydraulic conditions than would otherwise exist. GDC 26 requires that the thermal margin be sufficient to accommodate these conditions. SRP Section 15.6.1 examines this margin to ensure that thermal criteria are satisfied. Meeting the requirements of GDC 26 provides assurance that appropriate margins are included to accommodate malfunctions of the reactivity control