ML20136B138
| ML20136B138 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/29/1979 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Gossick L NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| References | |
| NUDOCS 7908230001 | |
| Download: ML20136B138 (2) | |
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to QUESTION IV Provide definitive analysis on the hydrogen bubble problem that occurred at TMI..
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ANSWER E f. '."
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Other than the an'alyses made at the time of the accident, and shortly t
thereafter, no definitive evaluation of the hydrogen /exygen generatton rate during the accident at TMI has been made by or for the staff.
The staff was not able to characterize the radiolytic decomposition of water in the unusual post-accident conditions in the TMI-2 reactor coolant system.
We instead depended primari~1y upon requests for technical assistance from other organizations.
A summary of this assistance is j
contained in the enclosed memoranda and notes. The staff intends to obtain the information'and complete a comprehensive evaluation of this aspect of i
the accident under the auspices of the Commission investigati.on of the a ccident.
..i/.
Although that eYaluation is not complete at th s time, the current under-standing, as summarized in the enclosed memorandum of June 13, 1979 from Thomas Murley, to Roger Mat.tson enclosure 1), is that after the initial clad-water reaction there was es(sentially no net production of or oxygen in the reactor vessel because the excess of hydrogen gas forced the recombination of any decomposition. products.
i In addition, the rate of production of hydrogen from radiolytic decomposition of the water in the containment was small compared to the containment volume.
- Copies of the information available in late March or_ early April on the i
reactor coolant s second enclosure.ystem hydrogen combustion question are provided in the The notes begin on. March 30, 1979. and extend through p-April 6,1979.
They were colated from files of Roger tattson, RoEert Tedesco, Darrell Eisenhut, Brian Grimes, the NRC Incident Response Center i
in Bethesda, and the NRC Command Trailer at Three Mile Island.
i the notes were dated when written, the notes were handwritten and most Most of were unsigned.
Dr. Mattson has attempted to place them in chronological 1
and could be recalled. order with an annotation of the author where such indica i
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