Document: NUREG-0800
Document ID: 061b3f99-1bfd-4e65-be97-7e9affac9aef
Document Type: srp
Title: UNCONTROLLED CONTROL ROD ASSEMBLY WITHDRAWAL AT POWER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600414.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.2
CFR Part: 
CFR Title: 

Content:
nate 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 reasonable 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. 15.4.2-5 Revision 3 - March 2007 5. Compliance with GDC 25 requires that the protection system be designed to assure that specified acceptable fuel design limits are not exceeded for any single malfunction of the reactivity control systems, such as accidental withdrawal (not ejection or dropout) of control rods. GDC 25 is applicable to this section because, as discussed in Section II above, 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). One criterion specifies that the RPS be designed to ensure that acceptable fuel design limits are not exceeded for either a PWR or a BWR during normal operation or AOOs, including in the event of a single malfunction of the RCS. The RPS operates in a timely manner to initiate automatic termination of the AOOs analyzed in this SRP section. 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 operation or AOOs. Meeting the requirements of GDC 25 provides reasonable assurance that a single malfunction of the reactivity control system, together with AOOs caused by the initiating event of an uncontrolled control rod assembly withdrawal at