Document: NUREG-0800
Document ID: 0b93bfa1-19be-488b-8c78-a6c71cf3b42e
Document Type: srp
Title: MASS AND ENERGY RELEASE ANALYSIS FOR POSTULATED
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0535/ML053560191.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.3
CFR Part: 
CFR Title: 

Content:
t the 61 cm (24-inch) level, and a constant 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. 6.2.1.3-6 Revision 3 - March 2007 iv. 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. v. 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 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, CRAFT-2, RELAP5/MOD2-B&W, Revision 1 and RELAP5/MOD2-B&W, Revision 4. Combustion Engineering: CEFLASH-4A and CESSAR System 80. General Electric: M3CPT, NEDO-20533, and SHEX. Westinghouse: WCAP-8312, SATAN-V, WCAP-10325, SATAN-VI, and WREFLOOD. Theses codes and methods have been referenced in licensee submittals and on a case by case basis have been found to be acceptable for these purposes. Other methods will be acceptable if they are