Document: NUREG-0800
Document ID: 23a67737-6e7e-4dfc-9090-dca6a186a7dc
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF MAIN STEAM LINE FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070679.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.1.5
CFR Part: 
CFR Title: 

Content:
en evaluated generically with the standard coolant activity and leakage limits, (2) the applicant proposes to use these standard limits, and (3) the atmospheric dispersion factors (X/Q values) for the site under review are lower than the limiting X/Q value used in the generic review of the standard plant steam line failure.26 The review of main steam line failure accidents at the operating license OL or COL stage 27 consists of the following steps: 1. Review of the applicant's descriptions of the steam line failure accident, with and without offsite power. This includes a review of the time sequence of occurrence of events. 2. Review of the applicant's description of events by the RSBSRXB, including operator actions. Review of the sequence of events to assureensure that the most severe case from the standpoint of release of radioactive materials and calculated doses has been identified calculated release of radioactive material has been identified. This determination is based on the amount of material released as well as on the resulting calculated doses.28 3. Determination of primary and secondary coolant activity equilibrium concentrations. The reviewer assumes the primary and secondary coolant activity concentrations allowed by the technical specifications (SAR Chapter 16 or the standard technical specifications given in References 2, 3, or 4) as equilibrium concentrations prior to the accident. 15.1.5-5 DRAFT Rev. 3 - April 1996 4. Determination of iodine spiking effects. For the dose calculations the following two cases of iodine spiking are analyzed: (a) A reactor transient has occurred prior to the postulated MSLB and has raised the primary coolant iodine concentration to the maximum value permitted by the standard technical specifications (i.e., a preaccident iodine spike case). The primary coolant iodine concentration for this case is obtained from Figure 3.4.16-1 of the NSSS vendor standard technical specification (Ref. 2, 3, or 4) 29 30 or from the