ML19253C010
| ML19253C010 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/02/1972 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7911040017 | |
| Download: ML19253C010 (2) | |
Text
,
October 2, 1972 Docket No.59-289 Metropolitan Edison Company ATTN:
Mr. John G. Miller Vice President P. O. Box 542 Reading, Pennsylvania Gentlemen:
We have completed our review of your Final Safety Analysis Report (FSAR), Section 2.5 Meteorology, up to and including Amendment 27, dated August 15, 1972. On the basis of our review, we have con-cluded that the atmospheric dif fusion f actor (X/Q) to be used in an accident analysis for the 0-2 hour time period at the site of Three Mile Island Unit 1 is 1.2 x 10-3 seconds per cubic meter at the minimum exclusion distance of 610 meters.
This diffusion factor corresponds to a Pasquill type F stability class with a windspeed of 0.5 meters per second.
Using this diffusion factor together with (a) a 2-hour dose reduction f actor of 5.58 due to sodium thiosulfate spray and (b) the integrated leak rate of 0.2 volume percent per day as stated in your FSAR, we determined that the 2-hour dose to the thyroid for the loss-of-coolant accident (LOCA) analysis is 537 Ram at the specified exclusion distance.
In order to reduce the potential radiological dose to an accept-able level we will require that the Technical Specifications limit the integrated leak este of the Three Mile Island Unit 1 containment system to 0.1 volume percent per day. We request that you revise your proposed Technical Specifications in accordance with this requirement and make appropriate changes to your FSAR where necessary.
Sincerely, 1505 124
/s / R. C. DeYoung R. C. DeYoung, Assistant Director for Pressurized Water Reactors Directorate of Licensing cc:
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Docket No. 50-289 PWR-2 Reading HSchie rling SHanauer MService RSBoyd Metropolitan Edison Company RCDeYoung ATIN:
Mr. John G. Miller DSkovholt Vice President FS chroede r P. O. Box 542 RRMaccary Reading, Pennsylvania DKnuth RTedesco Gentlemen:
HDen ton We have completed our review 'of your Final Safety Analysis Report (FSAR), Section 2.5, Meteorolo'gy, up to and including Amendment 27, dated August 15, 1972.
On the basic of our review, we have concluded that the atmospheric diffusion-factor (X/Q) to be used in an accident analysis for tiia4-2 hour time period at the site of Three Mile Island U it L is 1.2 x 10-3 sec/m3 at the minimum exclusion distancs of 610 meters.
This diffusion factor corresponds to a Pas (uill typoj F stability class with a windspeed of 0.5 meters er second.
Using this diffusion factor together with (a) a 2-hour dose reduction factor of 5/.58 due to sodium thiosulfate spray and (b) the integrated lqak rate of 0.27 as stated in your FSAR, we determined that tf e 2-hour dosejto the thyroid for the loss-of-coolant accident (LOCA) adalysis is 537 Rem at the specified exclusion d ance.
We have concluded that in order to meet the guidelines of 10 CFR Part 100, the Technical Specifications for the integrated leak rate of Three Mile Island Unit I will be limited to 0.1%
per day.
The necessary changes should also be included in your FSAR where appropriate.
Sincerely, R. C. DeYoung, Assistant Director for Pressurized Uster R.'s-tors Directorate of Licensing
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