Document: NUREG-0800
Document ID: 2133c57c-1767-4769-89e9-ceb528fb7c2b
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF STEAM GENERATOR TUBE FAILURE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350149.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.3
CFR Part: 
CFR Title: 

Content:
o attain an exact match but to confirm the validity of the applicant's calculated results. 4. The appropriate atmospheric dispersion factors (X/Q values) for the staff's independent dose analysis will be determined by the assigned meteorologist in accordance with SRP Section 2.3.4. 5. Determination of the initial primary and secondary coolant activity 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 3, 4, and 5) as equilibrium conditions prior to the accident. 6. 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 steam generator tube failure accident 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 3.4-1 of the NSSS vendor standard technical specification (Ref. 3, 4, or 5) or from the plant-specific technical specifications proposed in Chapter 16 of the applicant's SAR. (b) The reactor trip or the primary system depressurization associated with the postulated accident creates an iodine spike in the primary system (Ref. 6 and 7). The increasing primary coolant iodine concen- tration 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 rate corresponding to the iodine concentra-- tion at the equilibrium value stated in the NSSS vendor standard 15.6.3-3 Rev. 2 - July 1981 technical specifications or from the plant-specific technical specifications (i.e., concurrent iodine spike case). 7. Evaluation of the effects of fuel