ML20090J712
| ML20090J712 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/08/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20090J715 | List: |
| References | |
| RTR-NUREG-0798, RTR-NUREG-798 EF2-68188, NUDOCS 8405230182 | |
| Download: ML20090J712 (2) | |
Text
,_
Clyne H. Jens Dea'r*$tions DehoR Edison Ep3F*-
May 8, 1984 EF2-68188 Director of Nuclear Reactor Regulation Attention:
Mr.
D. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Youngblood:
Reference:
(1) Fermi 2 NRC Docket No. 50-341 (2) NUREG-0798, Safety Evaluation Report Related to Enrico Fermi Atomic Power Plant, Unit No.
2, Supplement No.
3, January 1983 (3) Letter, Detroit Edison to NRC, " Response to Items Requiring Resolution or Evaluation of Emergency Plan Supplement No.
3, NUREG-0798, January 1983", EF2-67132, February 23, 1984
Subject:
Results of the Short-Term Meteorological Study Conducted to Determine the Effect of Lake Erie on Plume Transport Characteristics at the Fermi 2 Site Enclosed are forty copies of the subject report in response to Item 3 of Section 13.3.2.8, of the Fermi 2 SER Supplement No. 3 (Reference 2), as committed in Reference (3).
Detroit Edison performed a short-term meteorological study from May to October 1983 and statistically analyzed the results as described in the attachment.
The enclosed report is based on Detroit Edison Engineering Research Report 83C52-2, dated March 21, 1984.
The objective of the study was to determine the influence of Lake Erie on plume transport at the Fermi 2 site and, if significant, appropriately modify the of fsite dose assessment models used during emergency situations.
k 8405230182 840500 (80
[DRADOCK 05000341 PDR f
I. f 1
__ _ _ j
Mr. B. J. Youngblood May 8, 1984 EF2-68188 Page 2 When the study was initiated in 1983, it was believed that
'through measurement of the appropriate parameters data could be entered in " coastal site" equations presented in the literature and an appropriate model could be selected for the Fermi 2 site.
With actual Thermal Internal Boundary Layer (TIBL) heights being measured by acoustic radar, the capability to statistically compare measured and predicted values was available.
A review of the results presented in the enclosed report clearly indicates that well known methods of predictive modeling do not satisfactorily correlate with measured values when using the Fermi 2 site specific 1983 data base.
Analytical work on the 1983 data base is continuing to identify a TIBL equation best suited for Fermi 2. Two approaches are under investigation:
Improvements to the predictive capability of the o
equations used in the study Development of a site specific relationship o
The results of this investigation will be used to determine the significance of TIBL formation on the dispersion of l
radioactive releases from Fermi 2.
If this effect is sig-nificant on dispersion, the appropriate modifications will be made to the offsite dose assessment model.
It is antici-pated this program can be accomplished such that any modifi-cations can be incorporated during the Summer of 1985.
l The present offsite dose assessment model is based on t
i straightline Gaussian plume transport and incorporates the algorithms found in Reference 17 to Regulatory Guide 1.111, Revision 1, July 1977 and assumes a building wake factor.
The calculations are made using real-time 15-minute averages from the Fermi 2 60 meter tower.
This model is considered adequate until the significance of the ef f ect of Lake Erie is determined because the terrain around the Fermi 2 site in the 10 mile EPZ is flat and has little or no effect on dispersion characteristics.
Should you have any questions, please contact Mr.
O. Keener Earle, (313) 586-4211.
Sincerely, l
l l
cc:
Mr.
P.
M. Byron Mr.
F. Kantor Mr. J.
G. Keppler (3)
Mr.
M.
D.
Lynch USNRC, Document Control Desk Washington, D.C.
20555 I
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