Document: NUREG-0800
Document ID: 846ded8e-04ea-4031-8f64-62690ca967b6
Document Type: srp
Title: ANTICIPATED TRANSIENTS WITHOUT SCRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570008.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.8
CFR Part: 
CFR Title: 

Content:
cedures similar to those described in Section III.2 above to confirm acceptable consequences without credit for a diverse scram system. 4. When introducing new fuel designs or power-density changes in BWRs, the reviewer will evaluate whether the core moderator void reactivity coefficient is consistent with the analyzed ranges in the generic BWR ATWS analyses (NEDE-24222). If the void reactivity coefficient is outside those ranges, then the limiting events must be evaluated as follows: A. Generically for every new fuel design. The fuel vendor must document the applicability of the new fuel to BWR ATWS events (e.g., Amendment 22 to GESTAR-II for GE fuels). B. On a plant-specific basis, when the new fuel design or power-density change is introduced. The licensee must confirm that the BWR ATWS acceptance criteria listed in Section II are satisfied for the limiting events. C. On a cycle-specific basis, the licensee must confirm that the ATWS analysis of record, based on the new fuel design or power-density change, bounds the plant-specific core configuration. The reviewer must pay special attention to transition cores involving mixed fuels. 5. For BWRs that implement both extended power uprate (EPU) and expanded power-flow domains (e.g., MELLLA+/Methods), the licensee must demonstrate the following: 15.8-10 Revision 2 - March 2007 A. The licensing ATWS code used to perform the analysis can model all the actions specified in the plant-specific EOPs or EOIs, including emergency depressurization if required. If the licensing ATWS code cannot model the plant- specific EOP actions, including depressurization if the suppression pool heat capacity temperature limit is reached, then the NRC cannot approve operation under the EPU and expanded operating domain. B. In special cases, the staff may accept the use of the ATWS licensing code, even though it cannot model all the required actions specified in EOPs. In these cases, supplemental sensitivity analysis can be used to