Document: NUREG-0800
Document ID: 3320f197-9b8e-4c8c-a548-d533a1f691f4
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF A CONTROL ROD EJECTION ACCIDENT (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350416.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.8
CFR Part: 
CFR Title: 

Content:
persion factors (X/Q values). The acceptability of the X/Q values is determined under SRP Section 2.3.4. III. REVIEW PROCEDURES The reviewer selects and emphasizes specific aspects of this appendix to SRP Section 15.4.8 as are appropriate for the particular plant. The judgment which areas need to be given attention and emphasis is determined by the similarity of the information presented in the SAR or other licensing submittals to that recently reviewed on other plants and whether items of special safety significance are involved. The detailed review of the radiological consequences of a rod ejection accident is done at the OL stage when system parameters and accident analysis results are fully developed. At the CP stage, the reviewer estimates the doses from the rod ejection accident based on the review of similar plants that have been recently reviewed. Regulatory Guide 1.77 (Ref. 2) is used in the analysis of the control rod ejection accident. In particular, Appendix B of the guide should be used in the evaluation of the radiological consequences. A loss of offsite power is assumed in the analysis. The AEB review of the accident includes the following: 1. Review of the applicant's description of the control rod ejection. accident: This includes a review of the sequence of events to assure that the most severe case from the standpoint of release of fission products to the environment has been analyzed. 2. Evaluation of fuel damage: The Core Performance Branch (CPB) reviews the physics and thermal-hydraulic aspects of the accident. Verification of the applicant's calculations of the number of fuel pins reaching DNB and the amount of fuel reaching the fuel melting temperature are obtained from the CPB. The fuel melting temperature criterion used for release of large fractions of fission gases corresponds to the initiation of melting as opposed to the 280 cal/gm used as a criterion by the CPB for core disruption. It is assumed that the fission products released to