Document: NUREG-0800
Document ID: 1085af08-a4b7-4fe7-bfed-ca7a60f2022c
Document Type: srp
Title: LOSS-OF-COOLANT ACCIDENTS RESULTING FROM SPECTRUM OF
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070734.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.5
CFR Part: 
CFR Title: 

Content:
f's safety evaluation report: The staff concludes that the loss-of-coolant analysis resulting from a spectrum of postulated piping breaks within the reactor coolant pressure boundary is acceptable and meets the relevant requirements of 10 CFR Part 50, 50.46 and Appendix K, GDC 35, 88 89 and 10 CFR Part 100. This conclusion is based on the following: The applicant has performed analyses of the performance of the emergency core cooling system (ECCS) in accordance with the Commission's regulations (10 CFR Part 50, 50.46 and Appendix K to 10 CFR Part 50). The analyses considered a spectrum of postulated break sizes and locations and were performed with an evaluation model which had been previously reviewed and approved by the staff as described in _________.that follows the guidance contained in Regulatory Guide 1.157 or Section I of Appendix K to Part 50 and meets the requirements of 10 CFR 50.46. The results of the analyses show that the 90 ECCS satisfy the following criteria: 1. The calculated maximum fuel rod cladding temperature does not exceed 1200 C o (2200 F). o 91 2. The calculated maximum local oxidation of the cladding does not exceed 17% of the total cladding thickness before oxidation. 3. The calculated total amount of hydrogen generated from the chemical reaction of the cladding with water or steam does not exceed 1% of the hypothetical amount that would be generated if all of the metal in the cladding cylinders surrounding the fuel, excluding the cladding surrounding the plenum volume, were to react. 4. Calculated changes in core geometry are such that the core remains amenable to cooling. 5. After any calculated successful initial operation of the ECCS, the calculated core temperature is maintained at an acceptably low value and decay heat is removed for the extended period of time required by the long-lived radioactivity. 6. The applicant has met the requirements of TMI Action Plan items II.E.2.3, II.K.2.8 (B&W), II.K.3.5 (Generic Letters 85-012,