Application of MAAP 4.0.2 and MAAP4-DOSE to develop revised accident source terms for Millstone unit 1
- Fauske & Associates, Inc., Hudson, OH (United States)
- Northeast Utilities Service Co., Hartford, CT (United States)
The revised source terms for regulatory use published in NUREG-1465 reflect time-dependent release characteristics associated with postulated core-melt accidents, which makes it possible to realistically credit fission product retention in the containment building. Due to the strong dependence of fission product retention on plant-specific features and accident sequence progression, however, NUREG-1465 source terms do not already credit retention. An additional point to consider is that {open_quotes}...any source term selected for a particular regulatory application should appropriately reflect the likelihood associated with its occurrence.{close_quotes} In other words, a licensee`s plant-specific source term should consider a spectrum of probabilistically significant accident scenarios. Such a set of accident sequences has already been developed and quantified by NUSCO in response to the U.S. Nuclear Regulatory Commission Generic Letter 88-20. NUREG-1465 also states that {open_quotes}An applicant may propose changes in source term parameters (timing, release magnitude, and chemical form) from those contained in [NUREG-1465], based upon and justified by design specific feature.{close_quotes} The ability of licensees to provide an alternate source term to NUREG-1465, which is justifiable, was reaffirmed, recently in meetings of the NRC Advisory Committee on Reactor Safeguards.
- OSTI ID:
- 426503
- Report Number(s):
- CONF-961103--
- Journal Information:
- Transactions of the American Nuclear Society, Journal Name: Transactions of the American Nuclear Society Vol. 75; ISSN TANSAO; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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