Critical parameters and measurement methods for post closure monitoring: A review of the state of the art and recommendations for further studies

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Description

Both NRC and EPA regulations require programs of post closure monitoring to detect substantial and detrimental deviations from expected performance. The unexpected in this case would involve anomalous stress changes that might rupture the canisters or changes in the hydrologic regime that might accelerate corrosion. In the event of leakage brought about by any means transport of radionuclides to the accessible environment could occur through unexpected changes in the hydrologic flow regime caused either by the long term effects of the thermal loading by the waste or by changes in regional stress or hydrology. Studies of performance confirmation have identified ... continued below

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60 p.

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Morrison, H.F.; Majer, E.L. & Tsang, C.F. May 1, 1987.

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Description

Both NRC and EPA regulations require programs of post closure monitoring to detect substantial and detrimental deviations from expected performance. The unexpected in this case would involve anomalous stress changes that might rupture the canisters or changes in the hydrologic regime that might accelerate corrosion. In the event of leakage brought about by any means transport of radionuclides to the accessible environment could occur through unexpected changes in the hydrologic flow regime caused either by the long term effects of the thermal loading by the waste or by changes in regional stress or hydrology. Studies of performance confirmation have identified six parameters or conditions that should be monitored that are associated with the thermal, mechanical and hydrologic phenomena introduced by the waste heat: temperature, stress, displacement, pore pressure, groundwater velocity and permeability. Since it is the thermal load that continues to increase after decommissioning, and which continues to alter the stress field and the hydrological regime, these same six parameters remain the critical ones in post closure monitoring. At two of the repository sites fractures have been clearly shown to be critical in modelling and performance confirmation; at the tuff site fluid saturation is also a critical parameter and for all the sites estimates of the groundwater velocity through the site are very important. Changes in fracture properties, saturation and fluid flow are thus of continuing importance in post closure monitoring. 14 refs., 19 figs.

Physical Description

60 p.

Notes

NTIS, PC A04/MF A01 - OSTI; OSTI as DE89008416

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  • Other Information: PBD: May 1987

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  • Other: DE89008416
  • Report No.: LBL--25505
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/60674 | External Link
  • Office of Scientific & Technical Information Report Number: 60674
  • Archival Resource Key: ark:/67531/metadc698146

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1987

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 4, 2016, 9:11 p.m.

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Morrison, H.F.; Majer, E.L. & Tsang, C.F. Critical parameters and measurement methods for post closure monitoring: A review of the state of the art and recommendations for further studies, report, May 1, 1987; California. (digital.library.unt.edu/ark:/67531/metadc698146/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.