ML19261E834
| ML19261E834 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/05/1970 |
| From: | Ross D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910170874 | |
| Download: ML19261E834 (2) | |
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ATOMIC ENERGY COMMISSION i
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i in June 5, 1970 R. C. DeYoung, Assistant Director for PNR's, Division of Reactor Licensing THRU:
C. G. Long, Chief, PWR-2 Project Branch, Division of Reactor. /,,e Licensing S C MI ETING WIfH MET-ED REPRESENTATIVES ON THREE MILE ISLA';D UNIT #1 METEOROLCGY (DOCKEI No. 50-289)
A meeting was held on May 19, 1970 to discuss the on-site meteo-rology
- data and analysis for T.11 Unit No. 1.
Attending were K. Woodward (of Pickard-Lewe, representing Met-Ed), Dr. Isaac VanderHoven (of ESSA), and Ross, Nischan, and Spickler of DRL.
Woodard stated that the percentage calms was about 4%, based en about 11,000 measurements in 2 years.
No breakdown on day-night calm distribution was immediately available.
The data have been rcduced to X/Q (and dose) vs probability of occu. rence with Sector (22 1/2*) as a paramet er.
In this analysis an extended exclusion distance was used (greater than 2000') for those directions, generally westward, that it appeared feasible.
No neni.ivu of this tyre of beundary extension is at preaent in the FSAR.
In a rough approximation to a 1-hour probability model, where the
-4 calras were classmed as Pasqdll G, im/sec, R appea[s that 5 x 10 3
3 sec/m is the five-percentile figure. We used 3 x 10 *sec/m at the CP review for 2-hour dose calculations.
We suggested at data be gathered to enable Pasquill category classification. Another meteorology tower is being constructed and at instruments will be installed.
We asked for revisions to Tables 2-10 through 2-16 of the FSAR, so that calms would be accounted for.
We also asked fer a clarification of the exclusion area boundary.
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D. F. Ross Distributicn:
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