ML19353A806
| ML19353A806 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/28/1981 |
| From: | Lynch O T Office of Nuclear Reactor Regulation |
| To: | Seo T AFFILIATION NOT ASSIGNED |
| Shared Package | |
| ML19353A808 | List: |
| References | |
| NUDOCS 8105070531 | |
| Download: ML19353A806 (3) | |
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Mr. Takeshi Seo.
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Dear Mr. Seo.
s This is in' response to your inquiry to Mr. Lake H. Barrett of March 10, requesting information on the accident at Three Mile Island, Unit 2, on March 28,1979. Mr. Barrett is now the Deputy Program Director Three Mile Island Program' Office (on site) and has asked at to respond since I have greater access.to the information you desire than he does.
I regret taking so long to respond to your request. The information you want, when it exists, has been filed in the archives of the Special Inquiry Group (of which I was a member) and what information I could recover has taken some time to obtain. Regretfully, recovery has not been complete. Many of the documents were reduced to microfiche and are illegible or impossible to locate without a difficult and time consuming search. However I have attempted to provide you with a substitute, of sorts, when possible, which may obviate the need for the actual data.
The information provided compares with that requested as follows:
1.
Quarter-hourly data of the meteorological condition, wind speed, wind direction and vertical temperature difference -- I have provided the best meteorological available:
(a) Memorandun for Files. Task Group 3, from 0. D. T. Lynch, Jr.,
June 27, 1979.
(Actual onsite met trwer data every 15 minutes, plus limited vertical temperature data.)
(b) Letter to Dr. A. Hull, Brookhaven National Laboratory, from George D. Greenly, Jr., dated May 21,1979.
(Met data collected by ARAC, including information from six sites different from TMI, to establish regional air flow patterns.)
2.
Direct readings of the area monitors named HPR-3236 and HPR-3240 -- This information is unavailable to me. I recall seeing a strip chart indicating readings from these units during the Special Inquiry, but have been unable
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1 to locate it..It was very difficult to interpret, since no digital printout was made. However, the President's Comission on the Accident at Three Mile q
Island'(Kemeny Comission) did look 6t this data and developed a source term j
from it.
I have included:
l (a) Appendix D of the President's Comission on the Accident at Three Mile Island, Report of the Task Group on Health Physics and Dosimetry, J. A. Auxier, et. al.,-September 29, 1979.
(The use of the data from HPR-3236 and the resulting source term are discussed
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in this appendix.)
(b) Special Inquiry Groun Report (RogovinJ, Vol. II, Part 2, pages 355-360.
(Evaluates various source tems developed, including that of the Kemeny Commission.)
(c) Special Inquiry Group Report (Rogovin), Vol. II, Part 2, pages 398-400.
(Provides population dose estimates using Kemeny Comission source tem based on HPR-3236 data.)
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(d) Utilization of. the Atmospheric Release Advisory Capability (ARAC) services during and after the Three Mile Island accident, UCRL-52959, i
Joseph B. Knox, et. al., July 1, 1980.
(See post-incident analysis, i
pages 11-19, and especially Figure 8, which depicts the Xenon-133 l
source term for the first 10.5 days of theaccident.)
3.
Figures showing.in detail the locations of the monitors HPR-3236, HPR-3240 and HPR-219 (G, P, I) -- I have been unable to locate any suitable drawings that detail the locations of these instruments.
However, I have included:
I (a) FSAR Table 12.1-5, Area Monitor Descriptions (which describes the locations of HPR-3236 and HPR-3240).
(O FSAR Table 12.2-2, Atmospheric Monitors (which describes the location i
of HPR-219).
(c) FSAR Figure 11-3-3, Gas Release Points (which indicates HPR-219 l
and describes the vent).
(d) FSAR Figure ll-3-3a, Gas Release Points and Site Layout (on which l
I have indicated the Unit 2 vant stack).
(e) Special Inquiry Group Report (Rogovin) Vol. I, page 10, Figure (on which I have indicated the locations of HPR-219 and HPR-3236.
l (f) Special Inquiry Group Report (Rogovin), Vol II, Part 2, Figure 11-13, l
General Building Arrangement (on which I have indicated the locations i
of HPR-219 and HPR-3236).
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4.
Measumd efficiencies of the charcoal cartridges used in the monitor HPR-219(I) and the offsite eight monitors (152. Scl. SA1, FG1.1C1, i
1281 and 9G1) -- I have been unable to locate this infomation. However, I have included *
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(a) Memorandum for Frank J. Miraglia, Leader. Task Group 3. from Ronald R. Bellamy, dated November 13,1979 (which indicates the mt;ults of en arilysis to determine the ioding species mieased).
l (b) A table of raw data indicating radiciodine releases. TMI-II, as detemined from etPR-219. Station vent.
(Obtainedfromthearchives, source Met-Ed.)
(c) Nuclear Consulting Services Report NUCON 6MT611/09. Iodine-131 Removal Efficiency Determination of Absorbeit Samples.
(This 1s Ref. 32 of 2(b) above, and, although does not indicate the 1
efficiencies of the specific charcoal cartridges you requested, it will give you an idea of what charcoal behavior was like during the accident. Incidentally, the FSAR indicates that the charcoal filters on the iodine detector are to have an efficiency of greater than 95%.)
(d) Nuclear Consulting Services Report NUCON 6MT611/12. Iodine-131 Removal Efficiency Determination of Absorbent Samples, Change #2.
(This is a revision of 4(c) above.)
5.
Formal estimates of total noble gas releases from Three Mile Island --
The only femal estimate by the NRC of the total noble gas release is j
12,1979. However, the one you indicated, the preliminary (estimate of Aprilthe NRC's Special Inq
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various calculations of the source ters and provided a discussion in their report.
Although the information provided here is not fully responsive to your inquiry, to improve upon it would require many days of reviewing thousands of microfiche and other files from the Special Inquiry Group and other TMI-2 accident resources (which have not necessarily been catalogued or filed in the most efficient manner).
Unfortunately, because d the urgent press of business, we do not have the manpower resources to justify a more involved search at this time.
I hope, howeeer, what we were able to recover will be of some ase to you in your research.
Sincerely, 2
/
or:ghsNg.wd by O D. T. Ly v A A.
Oliver D. T. Lynch, Jr., Section Leader Environmental Review Section Three Mile Island Program Office e
Enclosures:
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