Document: NUREG-0800
Document ID: 32a990b8-4423-466f-a1f4-198cd17fe8bf
Document Type: srp
Title: 15.3.2
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350154.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.3.1
CFR Part: 
CFR Title: 

Content:
LOSS OF FORCED REACTOR COOLANT FLOW INCLUDING TRIP OF PUMP MOTOR AND FLOW CONTROLLER MALFUNCTIONS REVIEW RESPONSIBILITIES Primary - Reactor Systems Branch (RSB) Secondary - None 1. AREAS OF REVIEW A decrease in reactor coolant flow occurring while the plant is at power could result in a degradation of core heat transfer. A resulting increase in fuel tem- perature and accompanying fuel damage could then result if specified acceptable fuel damage limits are exceeded during the transients. A number of transients that are expected to occur with moderate frequency and that result in a decrease in forced reactor coolant flow rate are covered by this SRP section. Each of these transients should be discussed in individual sections of the applicant's safety analysis report (SAR) as suggested by the Standard Format (Ref. 4). Core thermal and hydraulic transients associated with partial and complete loss of reactor coolant flow are evaluated. These include: 1. For boiling water reactors (BWRs), partial and complete recirculation pump trips and malfunctions of the recirculation flow controller to cause decreas- ing flbw. 2. For pressurized water reactors (PWR's), partial and complete reactor coolant pump trips. A partial loss of coolant flow may be caused by a mechanical or electrical failure in a-pump motor, a fault in the power supply to the pump motor, a pump motor trip caused by such anomalies as over-current or phase imbalance, or a failure within the recirculation flow control network (BWR) resulting in decreasing flow. A complete loss of forced coolant flow may result from the simultaneous loss of electrical power to all pump motors. Rev. 1 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to inform the nuclear