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Title: Development of the quantum seal.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1395799
Report Number(s):
SAND2016-9501PE
647686
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the SECANT Grand Challenge LDRD EAB held September 20-21, 2016 in Albuquerque, NM.
Country of Publication:
United States
Language:
English

Citation Formats

Sarovar, Mohan. Development of the quantum seal.. United States: N. p., 2016. Web.
Sarovar, Mohan. Development of the quantum seal.. United States.
Sarovar, Mohan. 2016. "Development of the quantum seal.". United States. doi:. https://www.osti.gov/servlets/purl/1395799.
@article{osti_1395799,
title = {Development of the quantum seal.},
author = {Sarovar, Mohan},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Conference:
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  • Previous work in the Green River basin of Wyoming indicates that overpressuring is the result of gas generation in low-permeability rock sequences. The authors concur, but suggest that an equally important aspect of overpressuring is the development of an effective seal. Most porosity in these tight reservoirs results from dissolution of mineral grains and cements. The effectiveness of this porosity-enhancing process is dependent, in part, on the ability of pore fluids to transport dissolved products away from the sites of dissolution. The authors suggest that, in low-permeability rocks, at depths beginning at subsurface temperatures of 190/sup 0/-200/sup 0/F (88/sup 0/-93/supmore » 0/C), rates of thermogenic gas generation exceed gas loss, causing fluid pressure to increase. In the larger pores, free water is forced into zones of lower pressure. As a result, a water block is formed, with water-bearing reservoirs updip and gas-bearing reservoirs downdip. In the active gas-generating zone, the remaining water is irreducible. This water is immobile and incapable of removing dissolution products. Thus, while other porosity-reducing processes continue, porosity-enhancing processes become ineffective, resulting in a pore network with very low porosity and permeability.« less
  • Current efforts have concentrated on establishing performance requirements and design criteria for a seal system. To accomplish this objective, the repository seal system is considered as one component of the multiple barriers concept of waste isolation. During fiscal year 1982, a simple calculational method to predict steady-state flow rates through a system of shaft seals and backfill zones as a function of plug dimensions, material permeability, and predicted hydraulic gradient has been developed. A Tektronix desk top computer has been programmed to assist in executing the calculations. A preliminary analysis of computer-produced data indicates disturbed rock zone permeability dominates calculatedmore » flow rates and travel times and, therefore as further studies proceed, greater emphasis will be given to the disturbed rock zone characterization. As model development continues, many of the assumptions will be removed and fracture flow conditions will be considered. The goal is to develop a model that is supported and verified by design development and laboratory, field, and in situ materials testing. 4 figures.« less
  • A seal improvement program for reactor recirculation pumps at the Nine Mile Point Unit 1 (NMP-1) plant was carried out from 1983 through 1986. Original seals had given recurring problems-unstable performance and unreliable lifetime, with particular sensitivity to transients and hot standby conditions. They caused an average of one outage per year, assessed at $420,000. The target was therefore to extend seal lifetime to 4 yr with a new, high-integrity seal designed to fit with minimum modification within the existing seal cartridge envelope.