Licensing Design Basis Source Term Update for the Evolutionary Advanced Light Water Reactor
- TENERA, L.P., Bethesda, MD (United States)
- Battelle Memorial Inst., Columbus, OH (United States)
- EG and G Idaho, Inc., Idaho Falls, ID (United States)
- Stone & Webster Engineering Corp., Boston, MA (United States)
- Los Alamos Technical Associates, Inc., NM (United States)
- US Department of Energy (USDOE), Washington DC (United States)
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States)
The purpose of this report is to document the technical basis for a licensing source term update for the Evolutionary Advanced Light Water Reactor (ALWR) which will make the source term more physically realistic. While TID (Technical Information Document) 14844 and related regulatory guidance have served the industry well, much has been learned about source term over the last 30 years, and the ALWR Requirements Document provides an opportunity to incorporate this experience by updating the licensing source term. Further, the source term update will provide an improved basis for evolutionary ALWR accident mitigation design. Results of this work indicate that the fission product release magnitude to containment is slightly less than TID 14844 for noble gas, iodine, and semi and low volatiles, but somewhat higher for cesium and tellurium. Release timing is delayed by one hour or more after the accident initiation. The chemical form of iodine is largely aerosol with significantly less organic iodine compared to regulatory guidance which specifies mostly elemental and a relatively large fraction of organic. Containment spray aerosol removal rate was determined to be significantly higher than specified in regulatory guidance. Finally, BWR suppression pool decontamination factor was determined to be less effective than allowed by regulatory guidance early in the accident (due to the delayed release noted above) and more effective than that allowed by regulatory guidance later in the accident. It is recognized by the ALWR program that the source term update could be taken further in the direction of a physically-based source term.
- Research Organization:
- EG and G Idaho, Inc., Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 6081119
- Report Number(s):
- DOE/ID--10298; MISC--90132; ON: DE91010061
- Country of Publication:
- United States
- Language:
- English
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