DISCLAIMER 5.6. 7.8. 9.10. 11.12. 13.14. . LIST OF FIGURES (contd.)Title LIST OF TABLES 1. 2.3. 4.5. 6. 7.8. 9. 10 ABSTRACTWaste package assemblies consisting of actinide-doped West Valley ATM-10 reference glass and sensitized 304L stainless steel have been reacted with simulated repository groundwater using the Unsaturated Test Method. Analyses of surface corrosion and reaction products resulting from tests that were terminated at scheduled intervals between 13 and 52 weeks are reported. Analyses reveal complex interactions between the groundwater, the sensitized stainless steel waste form holder, and the glass. Alteration phases form that consist mainly of smectite clay, brockite, and an amorphous thorium iron titanium silicate, the latter two incorporating thorium, uranium, arid possibly transuranics. The results from the terminated tests, combined with data from tests that are still ongoing, will help determine the suitability of glass waste forms in the proposed high-level repository at the Yucca Mountain Site. 1 2

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DISCLAIMERThis report was prepared a. k a n account of work sponsored by a n agency of theunited States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or asu.ms any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disdosed, or represents that its use would not infringe privately owned rights. Reference The apparent G(NO3-+ NO27 value for alpha exposure at 25°C is 2.4 * 1.1, slightly lower than that for gamma exposure at the same temperature. The lower yields may result from partial attenuation of alpha particles in the thin films of water that condensed on the 241Am foils used in the experiments. The alpha particle radiation being emitted from the waste after storage periods in excess of 300 years might still be of a sufficient intensity to acidify the thin films of water condensed on the waste. The . INTRODUCTIONcarboxylic acids in air-water systems exposed to radiation alpha-emitting transuranic elements suggests that radiolytic a long-term concern for repository performance.The emplacement of nuclear waste in a geologic repository will subject the immediate environment of the waste container to radiation effects. The waste container, and the radioactive waste itself in the event of container failure, will be exposed to radiolytic products formed by the interaction of radiation with the air and liquid present in the repository environment. The influence of these radiolytic products is an important consideration for radionuclide immobilization because of their ability to corrode the waste containers and radioactive waste forms, thereby increasing the potential for radionuclide release to the accessible environment.The intensities of the various types of radioactivity emanating from glass and spent nuclear fuel waste forms will vary as the waste ages. During the first several hundred years of repository operation, the radioactive energy is expected to be dominated by beta and gamma emissions from fission products with relatively short half-lives, such as 1376s and 90Sr w. Transuranic elements that decay to emit alpha particles generally have longer half-lives (from hundreds to tens of thousands of years) and will become the dominant radiation source at longer times. Because of their low penetrability in solids, alpha and beta particles can interact with the environment surrounding the waste container only after it has been breached and the aidwater environment of the repository has directly contacted the waste. Gamma radiation can penetrate the waste container walls and thus may interact with the environment surrounding the waste package immediately after emplacement. The relatively short half-lives of gamma-emitting sources, however, lessen their importance as the waste Many studies have been conducted to investigate the effects of radiation on glass ages (I.).. alteration in air-water systems. Ionizing radiation will electronically exc...

This report was prepared us an account of work sponsored by an agency uf the United StalesGovernment. Neither the United Slalcs Government nor any agency (hereof, nut any of thctr employees, makes any warranty, express or implied* or assumes any legal liability ur responsi bility for Ihc accurac;. completeness, or usefulness of any information, apparatus, producl, or process disclosed, or represents thai j|s use would not infringe privately owned rights. Refer ence rierein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise docs not necessarily constitute or imply iis endorsement, recom mendation, or favoring by ihc United Sidles Government or any agency thereof, The views and opinions of authors expressed herein do not necessarily state or reflect those of (he United Statu Government or any agency thereof, #^DISTBIBUltfB SF Tlliii B^di^i id UNLIMITED t Work perform' ««kr Ike iBfkn if Ik I .S. Dtprt-mn\ of Kxru by I J* met Urmmr N«li»«il I arm-IN) wfcf nxnci uahr M-7*5.tNG-4J. Tin hnawH »ti •frond u i« KTOMI of »Bk spMMrri by •• *r*c> of Ik Intro 1 SUIn Gotiwww. Nrilkt Ik I KMc W .SUM GoennMnl Mr Ik Lui'mlty of CalifanU Mr ••> of ikir rapfaym. irako My airruty. r\tmi oriaoUei, or •»•«"» in) kial llaoilHy or ia|» utility for Ik Koxy. nmtkttimv ir nrMarn of lay iafonaatioa. iHualw. oroiorl, pr oractvt rindou*. or rrornrab thai in me KHM M infrion oritmlv i**i rhdiln. RrfcreMc kretfl to uy iptdfir itmimiroal tro4acu. pracm orvnlcf a? trao>ajo*.lrao>iMrk.auiMfac. law. or otkrwiK. wn Ml aecnstrilj ctffilkMt or imply in twlmcmn*. rtcoamtkilioa, or fnorinc IJ ik I'ltM Slain CotrnHanii or Ik 1'nitersiijr of California. Tk rinj ••i ufiwn of artkn rxpreuta' kreln w Ml arrev uril\ Mid or ttflrct iko* ef Ik UnM4 Stun GmrMMM or Ik Ulicnlly of Califoraia. ud tull am k ova 1 for •iiHiHinft or product raoannarM tarpaMs.

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