ML19261E829
| ML19261E829 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/19/1970 |
| From: | Ross D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910170858 | |
| Download: ML19261E829 (2) | |
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UNITED STATES ATOM!C ENERGY CCMM:SSiCN rg '
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June 19, 1970 P.. C. DeYoung, Assistant Director, PWRs Division of Reactor Licensing f,/',('
THRU :
Charles G. Long, Chief, PWR Project Branch 2, DRL 4'~
HYDROLOGY MEETING ON THREE MILE ISLAND UNIT 1, POL (DOCKET 50-289)
A meeting was held with representatives of Gilbert Associates, the A/E for Met-Ed on Three Mile Island Unit 1.
The purpose of the meeting was to discuss the PMF calculations for the site. At tending were R. H.
MacLemore and Joel Caves for Gilbert and D. Ross, W. Nischan, and D. Nunn for DRL.
MacLemore demonstrated a plot of flood stage along the river f or various discharges up to 1.75 million cubic feet per second. He also showed a map where flood contours had been calculated.
He discussed the procedures used to calculate level versus discharge with the DRL hydrologist, D. Nunn.
As a result of our discussions, we notified Gilbert that we contemplated four broad question areas to be included in our next formal list of questions, along the following lines:
1.
We caid that the pplicent chculd provide a discharge hydrograph for the PMF, both regulated and unregulated.
2.
We asked for the backwater analyses for the 1936 and 1964 floods and for the calculated discharges of 1.1 million and the PMF.
3.
We requested a discussion of the procedures for calculation of backwater cnd the significance of overbank flow.
This should include, we said, a table shcwing the Manaing-n coef ficients,
and the discharge values and elevations at each cross section.
We also want the comparison ot measured versus computed eleva-tions for the observed floods incorporating the known high water marks, and a map showing the location of the river cross sections used in the computer program.
Finally, we want flood level Con tou rs.
4.
We anticipate a need for a discussion by the applicant of the operating procedures in advance of and during extreme flood events. This should include the information that will be avail-able to the operating staf f and the decision levels that the staf f must face in terms of river stage or precipitation.
79101" U 1481 066
.4 R. C. DeYoung 2
June 19,1970 These comments were given to the Gilbert representatives. We cautioned them to await a formal trans'. sion of these requests before submitting answe rs. We also notified th<
of our intention to visit the site next mon th.
h e. L 6 ',l c.-
sp.
Denwood F. Ross PWR Project Branch 2 Division of Reactor Licensing Distribution:
Docket DRL Reading PWR-2 Reading P. A. Morris F. Schroeder T. R. Wilson R. S. Boyd R. C. DeYoung D. Skovholt E. C. Caca. DRS R. R. Maccary R. W. Klecker Compliance (2)
DRL & DRS Branch Chiefs D. F. Ross W. E. Nischan D. Nunn F. W. Karas
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