Document: NUREG-0800
Document ID: fce5c014-cdea-4bf2-83f9-535d051f0f3b
Document Type: srp
Title: MISSILES GENERATED BY NATURAL PHENOMENA
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070375.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.4
CFR Part: 
CFR Title: 

Content:
iew guidance provided for Evolutionary reactors in the new review procedure step concerning the determination of the statistical significance of identified missiles. 24. Integrated Impact # 280. A new step was added to the review procedures to address the application of probability calculations used to evaluate the statistical significance of identified missiles. Because this change is based upon reviews documented in the ABWR FSER, the applicability of this new review procedure was limited to new applications. The review procedure is consistent with the staff positions documented in section 3.5.1 of the ABWR FSER. 25. Editorial. Renumbered the review procedure steps to accommodate the addition of four new review procedures. SRP Draft Section 3.5.1.4 Attachment A - Proposed Changes in Order of Occurrence Item Source Description DRAFT Rev. 3 - April 1996 3.5.1.4-12 26. Metric Conversion. Converted 1800 kg to 4000 lb to allow for presentation in dual units. Note that there appears to be a contradiction between the various spectra (I,II,A and B) regarding the mass of the automobile missile. However, there is no real conflict here because this object is relatively massive and the minor differences in mass occurring as a result of the rounding rules for conversions, and because of the restrictions on changing established staff guidance without supporting information, are insignificant. For example: in spectra A and B the staff originally specified 4000 lb which must be converted and rounded to 1814 kg to respect the limit (a lighter missile of 1800 or 1810 would imply non-conservative rounding methods) which then apparently conflicts with the two original values of 1800 kg (for spectrum I) and 1810 kg (for spectrum II) which can be conservatively converted and rounded to 4000 lb. 27. Metric Conversion and Editorial. Converted 125 kg to 280 lb and 8" to 20 cm to allow for presentation in dual units. Presented the inch (") indicator as (in.) to be consistent with the