ML19338B999
| ML19338B999 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/05/1970 |
| From: | COMMERCE, DEPT. OF |
| To: | |
| Shared Package | |
| ML19338B997 | List: |
| References | |
| NUDOCS 8007291148 | |
| Download: ML19338B999 (3) | |
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-Comments on-
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Midland Plant Units 1 and 2 Consumers Power Company j
4 Prelimiring Safety Analysis Report Amendment No. 5, dated' November 7, 1969 Prepared by f
Air Resources Environmental Laboratory Environmental Science Services Administration
~
-January 5, 1970
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Except for the revised site boundary of 500 m, no new meteorological
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~
data are presented in Amendment No. 5 that would change our'~ conclusions-
' as stated in~ cements dated February 3,1969 and July.28, 1969 1
For the 2-hour release we conclude that the Type F inversion condition,-
a 1 m/see wind speed, and a factor of 3 for building effect is a reasonably j.
conservative assumption.
For the.24-hour release, the applicant's analysis from a very limited amount of data shows that for 18 selected " worse" days, the number of hours'of inversion Type F varied from 10 to 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> per day, i
Consequently, we feel that a reasonably conservative assumption is 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> of Type F at 1 m/sec 6_hoursofEat2m/secand6 hours ~ofD
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at 3 m/see averaged over a' 22h degree sector,
~
For the 30-day _ release a mav4== monthly sector wind direction' frequency -
of 20 percent seems appropriate from the seasonal frequencies presented in Fig. 2A5. We also assumed the diffusion conditions to be equally.
distributed. among Types-F, 'D and C at 2, 3 and 3 m/sec respectively and averagedovera22hdegreesector.
Based on a 15 percent prevarHng. wind direction frequency at Saginaw on an annual basis '(Fig. 2A5) we -assumed for the annual concentration a -
TypeDconditionwithaAm/seewindspeedayeragedovera22hdegree sector.
In~ summary,' a comparison of the ESSA computed relative concentrations at 500 m from a ground source to those calculated by the applicant are as follows:
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2 Release ESSA Aeolicsnt 3
2-hr 7 x 10'4
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MEMO:
REPORTi OTH ER:
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cci oTH ER, Dr. Morris 1
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o^TE ^"swrRro ACTION NECESSARY NO ACTION NECESSARY O cowurnr O
ev CLASSIFr POST OFFICE FILE CCDE:
DOCKETS:f50-3J29-330, -285 sne -334 U
DESCRIPTION: (Must B. Uriclassifisc)
REFERRED TO DATE RECEIVED BY DATE Merno ref. our 11-21, 12-22 and 12 69 letters and bereby trans. the P. nm:
2-9 1 (TF9 following coiments as papand by v/2 cyu. -- FM ACTION air assource Env. Isb., ESSA....:
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