Document: NUREG-0800
Document ID: 7a841760-7020-433b-b182-63af2e6f5e72
Document Type: srp
Title: OVERPRESSURE PROTECTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340596.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.2
CFR Part: 
CFR Title: 

Content:
cific acceptance criteria necessary to meet the requirements of GDC 15 and 32 are as follows: A. For overpressure protection, during power operation of the reactor, the relief valves shall be designed with sufficient capacity to preclude actuation of safety valves, during normal operational transients, when assuming the following conditions at the plant: a. The reactor is operating at licensed core thermal power level. 5.2.2-2 Rev. 2 - November 1988 b. All system and core parameters are at values within normal operating range that produce the highest anticipated pressure. C. All components, instrumentation, and controls function normally. Safety valves shall be designed with sufficient capacity to limit the pressure to less than 110% of the RCPB design pressure (as specified by the ASME Boiler and Pressure Vessel Code [Ref. 2]), during the most severe abnormal operational transient with reactor scram. Also, sufficient margin shall be available to account for uncertainties in the design and operation of the plant assuming: (1) The reactor is operating at a power level that will produce the most severe overpressurization transient. (2) All system and core parameters are at values within normal operating range, including uncertainties and technical specifica- tion limits that produce the highest anticipated pressure. (3) The reactor scram is initiated by the second safety-grade signal from the reactor protection system. (4) The discharge flow is based on the rated capacities specified in the ASME Boiler and Pressure Vessel Code (Ref. 2), for each type of valve. 3. Full credit is allowed for spring-loaded safety valves designed in accordance with the requirements of the ASME Boiler and Pressure Vessel Code (Ref.7). B: The low temperature, overpressure protection (LTOP) system shall be designed in accordance with the requirements of Branch Technical Posi- tion RSB 5-2 attached to this SRP section (Ref. 3). The LTOP system shall be operable during startup and shutdown