Document: NUREG-0800
Document ID: 7c5a6f62-3fbc-4bde-8062-2eb15eeb6d45
Document Type: srp
Title: UNCONTROLLED CONTROL ROD. ASSEMBLY WITHDRAWAL FROM A SUBCRITICAL OR LOW POWER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350326.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.1
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Content:
STARTUP CONDITION REVIEW RESPONSIBILITIES Primary - Core Performance Branch (CPB) Secondary - None I. AREAS OF REVIEW The CPB evaluates the effects and consequences of an uncontrolled control rod assembly withdrawal (a bank for a pressurized water reactor; and a single rod, with current control modes, for a boiling water reactor*) from a subcritical or low-power (e.g., startup-range) condition to assure conformance with the require- ments of General Design Criteria 10, 20, and 25 under this SRP section. The review under this SRP section covers the description of the causes of the transient and the transient itself, the initial conditions, the reactor parameters used in the analysis, the analytical methods and computer codes used, and the consequences of the transient as compared with the acceptance criteria. The reactivity coeffi- cients and control rod worths utilized in this review are also evaluated by the CPB under SRP Section 4.3. II. ACCEPTANCE CRITERIA 1. The following General Design Criteria (Ref. 1) apply: a. Criterion 10, which requires that specified acceptable fuel design limits are not to be exceeded during normal operation, including the effects of anticipated operational occurrences. b. Criterion 20, which requires that the protection system initiate auto- matically appropriate appropriate systems to assure that specified accep- table fuel design limits are not exceeded as a result of anticipated operational occurrences. "If a single-failure proof system prevents the uncontrolled withdrawal of a control rod, this transient need not be considered for BWRs. Rev. 2 - 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 Industry and the general public of regulatory procedures