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Technical elements for the performan...

Light, William Bradley.

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Technical elements for the performance assessment of a high-level waste geologic repository.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Technical elements for the performance assessment of a high-level waste geologic repository./
作者:	Light, William Bradley.
面頁冊數:	265 p.
附註:	Chair: Thomas H. Pigford.
Contained By:	Dissertation Abstracts International59-03B.
標題:	Engineering, Environmental. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9827014
ISBN:	0591794179

Technical elements for the performance assessment of a high-level waste geologic repository.
Light, William Bradley.

Technical elements for the performance assessment of a high-level waste geologic repository. - 265 p.

Chair: Thomas H. Pigford.

Thesis (Ph.D.)--University of California, Berkeley, 1997.

Techniques for predicting various performance elements of a high level radioactive waste repository are developed and demonstrated.

ISBN: 0591794179Subjects--Topical Terms:

783782
Engineering, Environmental.

Technical elements for the performance assessment of a high-level waste geologic repository.
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245 1 0 $a Technical elements for the performance assessment of a high-level waste geologic repository.
300 $a 265 p.
500 $a Chair: Thomas H. Pigford.
500 $a Source: Dissertation Abstracts International, Volume: 59-03, Section: B, page: 1343.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 1997.
520 $a Techniques for predicting various performance elements of a high level radioactive waste repository are developed and demonstrated.
520 $a In the unsaturated Yucca Mountain repository site gaseous radionuclides traveling through open fractures will be retarded by absorption into pore-bound liquid. For small values of the modified Peclet number the fractured porous medium can be modeled as an equivalent continuum as demonstrated by discrete fracture analysis. The travel time for C-14(O2) from failed containers to the accessible environment is predicted to be hundreds to thousands of years and doses from above ground concentrations to be much lower than background radiation at sea level.
520 $a A spent fuel source term is developed for episodic flooding of a partially-failed container. Solubility-limited, congruent, preferential and alteration-rate based release modes are considered. Transport is by advection with the mostly-intact container being credited with effectively blocking diffusive pathways. The possible benefits of limited oxygen entry into the container is also discussed. Calculated releases in response to assumed major flooding episodes are comparable to those of wet-drip models.
520 $a A weapons-plutonium glass waste form might be driven to supercriticality by a flooding episode in the distant future if neutron poisons are first washed away as shown by a preliminary hydrodynamics-coupled reactor model. Criticality is approached from the undermoderated side as water enters the degraded waste form. Point neutronics equations track the event through self-shutdown by water expulsion. Calculated event magnitudes are comparable to those of documented criticality accidents.
520 $a The fundamental problem of diffusion from a circular disc source at constant concentration located in the boundary of a semi-infinite media is solved numerically using coordinate transformation, grid scaling, and intelligent finite difference algorithms. The resulting time-dependent mass-transfer rate is compared to preexisting early and late-time asymptotes which are shown to be in relative agreement for the first 15 minutes and after 300 years for a representative partially-failed container scenario. A similarity solution for early time is also given; its extension to the corresponding infinite half-plane problem is discussed.
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791 $a Ph.D.
792 $a 1997
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