Document: NUREG-0800
Document ID: a4ef36de-b662-41f6-9e66-96e4b7197298
Document Type: srp
Title: MASS AND ENERGY RELEASE ANALYSIS FOR POSTULATED
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0601/ML060150002.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.3
CFR Part: 
CFR Title: 

Content:
CRF of 0.80 until the | water level is 61 cm (2 feet) from the top of the core. Above this level, a | CRF of 0.05 may be used. The assumption of steam quenching should be justified by comparison with applicable experimental data. Liquid entrainment calculations should consider the effect on the CRF of the increased core inlet water temperature caused by steam quenching assumed to occur from mixing with the ECCS water. Steam leaving the steam generators should be assumed to be superheated to the temperature of the secondary coolant. d. PWR Post-Reflood Phase All remaining stored energy in the primary and secondary systems should be removed during the post-reflood phase. Steam quenching should be justified by comparison with applicable experimental data. The results of post-reflood analytical models should be compared to applicable experimental data. e. PWR Decay Heat Phase The dissipation of core decay heat should be considered during this phase of the accident. The fission product decay energy model is acceptable if it is equal to or more conservative than the decay energy model given in Branch Technical Position ASB 9-2 in SRP Section 9.2.5. Steam from decay heat boiling in the core should be assumed to flow to the containment by the path which produces the minimum amount of mixing with ECCS injection water. The following methods and computer models are acceptable for calculating the | mass and energy releases for containment design basis calculations: | | Babcock and Wilcox / Framatome ANP: CRAFT (Reference 6), CRAFT-2 | (Reference 2), RELAP5/MOD2-B&W, Revision 1 (Reference 7), and | RELAP5/MOD2-B&W, Revision 4 (Reference 8). | | Combustion Engineering: CEFLASH-4A (Reference 3), and CESSAR System 80 | (Reference 9 and 10). | | Rev. 2 - January 2006 6.2.1.3-6 General Electric: M3CPT (Reference 11), NEDO-20533 (Reference 12), and | SHEX (Reference 13, 14, and 15). | | Westinghouse: WCAP-8312 (Reference 16), SATAN-V (Reference 1), WCAP- | 10325 (Reference 17),