Document: NUREG-0800
Document ID: 96cbc2a1-0072-44c5-ae86-aadfa416183c
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF MAIN STEAM LINE FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350118.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.1.5
CFR Part: 
CFR Title: 

Content:
equence of occurrence of events. 2. Review of the applicant's description of events by the RSB, includin operator actions. Review of the sequence of events to assure that the most severe case from the standpoint of release of radioactive materials .and calculated doses has been identified. 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. 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 concentra- tion for this case is obtained from Figure 3.4-1 of the NSSS vendor standard technical specification. (Ref. 2, 3, or 4) or from the plant specific technical specifications proposed in Chapter 16 of the appli- cant's SAR, as appropriate. (b) The reactor trip and/or primary system depressurization associated with the MSLB creates an iodine spike in the primary system (Refs. 5 and 6). The increase in primary coolant iodine concentration is estimated using a spiking model which assumes that the iodine release rate from the fuel rods to the primary coolant (expressed in curies per unit time) increases to a value 500 times greater than the release 15.1.5-12 Rev. 2 - July 1981 rate corresponding to the iodine concentration at the equilibrium value stated in the NSSS vendor standard technical specifications or from the plant specific technical specifications, as appropriate (i.e., concurrent iodine spike case). 5. Evaluation of the effects of fuel failure.