Document: NUREG-0800
Document ID: 7ed30441-8f7a-44a4-b42a-6bbe8c5bbff4
Document Type: srp
Title: UNCONTROLLED CONTROL ROD ASSEMBLY WITHDRAWAL AT POWER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070712.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.2
CFR Part: 
CFR Title: 

Content:
assembly withdrawal at power, in combination with a LOOP will not result in a reactor transient that could cause the reactor coolant pressure boundary design conditions or the fuel design limits to be exceeded.26 3. Compliance with GDC 20 requires that the protection system be designed (1) to initiate automatically the operation of appropriate systems, including the reactivity control systems, to ensure that specified acceptable fuel design limits are not exceeded as a result of anticipated operational occurrences and (2) to sense accident conditions and to initiate the operation of systems and components important to safety. GDC 20 is applicable to this section because the reviewer evaluates the effects and consequences of an uncontrolled control rod assembly withdrawal at power (i.e., a bank for a PWR; a single rod with current control modes for a BWR). The reactor protection DRAFT Rev. 3 - April 1996 15.4.2-4 system (RPS) automatically initiates the operation of appropriate systems, including the reactivity control system (RCS), to terminate the AOOs analyzed in this SRP section. The AOOs are terminated in a timely manner so that acceptable specified fuel design limits are not exceeded for either a PWR or a BWR. SRP Section 15.4.2 as well as SRP Sections 4.2, 4.3, and 4.4 provide guidance for ensuring that specified acceptable fuel design limits are not exceeded as a result of AOOs. Meeting the requirements of GDC 20 provides assurance that specified acceptable fuel design limits are not exceeded by ensuring that the RPS initiates the operation of appropriate systems in a timely manner to terminate AOOs caused by an uncontrolled control rod assembly withdrawal at power.27 4. Compliance with GDC 25 requires that protection systems be designed to ensure that specified acceptable fuel design limits are not exceeded for any single malfunction of the reactivity control system such as accidental withdrawal (not ejection or dropout) of control rods. GDC 25 is applicable