Yucca Mountain Update -- A Publication of the State of Nevada Nuclear Projects Agency

Volume 1 Issue 2 - December 23, 2002
http://www.state.nv.us/nucwaste

 

 

 

IN THIS ISSUE...
- Nevada Proposes Comprehensive, Independent Testing Program for Casks Designed to Deliver Nuclear Waste to Yucca Mountain
- Laboratory Experiments: Metal Alloy Nuclear Waste Containers Will Dissolve


Nevada Proposes Comprehensive, Independent Testing Program for Casks Designed to Deliver Nuclear Waste to Yucca Mountain

Citing serious credibility problems associated with past federal government-sponsored tests of casks being developed to deliver high-level nuclear waste to the proposed Yucca Mountain repository, the State of Nevada Nuclear Projects Agency recently asked U.S. Nuclear Regulatory Commission Chairman Richard Meserve to consider Nevada’s proposal on how to carry out a series of independent tests to oversee and verify the government’s previous findings.

 

A current-generation truck transportation cask.In a letter to Meserve, agency Executive Director Bob Loux said the state believes that “comprehensive full-scale testing would not only demonstrate compliance with NRC performance standards, it would improve the overall safety of the cask and vehicle system and generally enhance confidence in both qualitative and probabilistic risk and analysis techniques.” 

 

Loux also wrote that the tests could increase public and state and local government acceptance of the shipments, and could reduce adverse social and economic impacts caused by current public perceptions of the risks of transporting the nation’s high-level nuclear waste to Yucca Mountain, 90 miles northwest of Las Vegas.

 

A future-generation rail transportation cask. Nevada is proposing a four-pronged approach to the full-scale certification testing: meaningful stakeholder participation in development of testing protocols and selection of test facilities and personnel; full-scale physical testing, including sequential drops of casks, fire, puncture, and immersion, prior to NRC certification; additional computer simulations to determine performance in extra-regulatory accidents and to determine failure thresholds; and, reevaluation of previous risk study findings and, if appropriate, revisions of NRC cask performance standards. 

 

Loux said Nevada also considers destructive testing of a randomly selected production cask to be a highly desirable way of ascertaining actual failure thresholds.

 

Nevada in 1999 requested a comprehensive assessment of the affects of three types of terrorist attacks and sabotage on waste casks: attacks against transportation infrastructure used by nuclear waste shipments, attacks involving the capture of a nuclear waste shipment and use of high-energy explosives against the cask, and direct attacks on a cask using anti-tank missiles.  As part of that request, Nevada also recommended that the NRC consider the need for physical testing on full-scale or scale models of casks to evaluate weapons capabilities, cask vulnerability to attack with high-energy explosive and the response of spent nuclear fuel to such attacks. 

 

However, Loux said the NRC has yet to take any action on Nevada’s recommendation, “despite the added urgency brought about by the events of Sept. 11 and their implications for potential terrorism against spent fuel and/or high-level waste shipments.”

 

Loux added that during the preliminary phase of the NRC’s Package Performance Study, conducted in 1999 and 2000, the NRC repeatedly acknowledged the importance of establishing stakeholder confidence in the PPS study process and its findings.  However, the NRC has yet to release the draft PPS testing protocol for public review and comments, as it promised in summer 2002, nor has the NRC rescheduled the promised PPS public meetings in Nevada, originally planned for August and September, 2002.

 

“The process to date does not inspire confidence, nor does it come close to meeting NRC-stated commitments to public and stakeholder involvement in developing and review of testing protocols,” Loux said.

 

Laboratory Experiments: Metal Alloy Nuclear Waste Containers Will Dissolve
S
cientists working for the State of Nevada recently told the National Academy of Sciences’ Board of Radioactive Waste Management that metal alloy containers designed to hold high-level nuclear waste at Yucca Mountain will in time dissolve under certain conditions.

 

Dr. Roger Staehle and Dr. Don Shettel conducted the experiments at Catholic University using conditions simulating those anticipated at Yucca Mountain.  They told the board that given the natural conditions found at Yucca Mountain – including moisture and heat – manmade metal alloy containers cannot safely hold high-level nuclear waste for the required regulatory period, but in time will dissolve.

 

“These findings reinforce our belief that the U.S. Department of Energy and the Nuclear Regulatory Commission have long used fuzzy science to prop up their plans to dump the nation’s nuclear waste in Nevada,” said Loux.  “Once again, the scientific facts are proving the fallacy of DOE’s assertion that Yucca Mountain is safe for the long-term storage of nuclear waste.”

 

A schematic showing a storage container for high-level nuclear waste. (Department of Energy graphic)A critical element of the proposed Yucca Mountain repository is an engineered barrier system incorporating nuclear waste canisters composed of C-22 Hastelloy and a drip shield made of titanium-7 metal. The drip shield is designed to divert any water seepage
and prevent it from reaching the waste canisters.

Dr. Staehle and Dr. Shettel have been conducting laboratory experiments to assess the stability of the two key barrier metals, C-22 and Ti-7, under anticipated repository conditions. These conditions include rock dust and precipitates covering the drip shield and hot canisters; fracture and rock-pore water dripping and flowing; microbial/fungal reactions; and man-made intrusive materials.

Using simulated Yucca Mountain pore water, Dr. Staehle’s and Dr. Shettel’s experiments strongly suggest that heating in the repository will produce a powerful acid vapor called aqua regia, which is so potent it even dissolves gold. As this caustic vapor condenses and evaporates, concentrated acid and solid precipitates form. The solid precipitates in turn attract water vapor from the air and form additional very strong acids. Under these conditions, at temperatures ranging from 70 degrees Celsius (158 degrees Fahrenheit) to 145 C (293 F), the engineered-barrier metals C-22 and Ti-7 dissolve.

The scientists’ findings just add to the list of problems with C-22 and Ti-7.  Previously, laboratory results showed that lead, mercury, fluorine, and possibly other trace elements in the water and rock of Yucca Mountain would hinder the ability of C-22 and Ti-7 to contain the nuclear wastes for the required period of time.

Outrage of
the Week

Yucca Mountain project spokesman Alan Benson, responding recently to finds of State of Nevada researchers that the canisters DOE is designing to hold spent fuel and high level radioactive waste in a Yucca Mountain repository are subject to severe and rapid corrosion, was quoted as saying that "no decision has been made about what type of alloy to use for the casks."

Such an admission is not only remarkable, but it is also reflective of the disingenuous and misleading information DOE used to convince Congress last summer that Yucca Mountain should be approved as a repository location. 

Because DOE has been forced to acknowledge that the geology at Yucca Mountain is so porous it can't, by itself, keep deadly radioactive waste from reaching the accessible environment, DOE proposes to use exotic waste disposal containers that will have to be able to withstand corrosion - and every other form of natural process and event - for 10,000 years or more.  To do this, DOE settled on an unproven metal alloy known as C-22 for the waste canisters, and boldly touted the material's durability.  

The problem is, DOE never did the studies to determine if the metal would, in fact, perform as advertised.  When Nevada scientists conducted the research, it became apparent very rapidly that C-22 (as well as the titanium proposed to be used for drip shields over each of the waste containers) would corrode quickly when exposed to water with the chemical make up of that found underground at Yucca Mountain.

In light of this finding, DOE's spin doctors are now saying that the State's findings are not important because DOE hasn't decided what metal the waste disposal packages will be made from.  Well, if alloys as highly touted as C-22 and as durable used as titanium won't do the job, it's hard to imagine any metal that is going to last 10,000 years.

More disturbing, Benson's admission means that DOE's entire basis for using Yucca Mountain suitable as a repository is negated.  The only way DOE could assert that waste disposed of at Yucca Mountain would remain isolated from the environment was to create the myth of 10,000 year waste containers.  Admitting that DOE hasn't a clue about how to make the containers last that long is paramount to admitting the entire Yucca Mountain program is a scam.


 

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