ML19249F173
| ML19249F173 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/26/1973 |
| From: | Bernero R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19249F153 | List: |
| References | |
| NUDOCS 7910100580 | |
| Download: ML19249F173 (2) | |
Text
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October 26, 1973 THREE MILE ISLAND NUCLEAR STATION - DOCKET NO. 50-289 Supplemental Testimony on Flooding By Robert M. Bernero Contention 8.
It is contended that the dikes for the facility have not been constructed for the probable maximum flood.
It is contended that there is not adequate protection in the event of flooding for the -
facility.
Th' Regulatory Staff evaluated the Three Mile Island Nuclear Station e
dike design and the emergency procedure Flood Control, #1202-32, Revision 0, and concluded that they provide adequate assurances that the plant will be safely protected in the event of severe floods up to and including the probable maximum flood $ In drawing that conclusion we noted that a minimum of four hours is available between the time the emergency procedco calls for the plant to be shut down and the time when the waters of the probable.aximum flood back up from the downstream end of the island to the grade level of the plant.
The procedure calls for taking the plant to cold shutdown; I evaluated whether adequate time is available to conduct operations needed for shutdown. The plant is designed so that it can be shutdown and cooled down safely using only the " safety grade" equipment which is located within the structures protected from the floodwaters by flood panels.
Therefore, the offsite power equipment or the cooling tower equipment
- See testimony on this contention by Lewis G. Hulman of the Regulatory Staff.
7010100 h
which might be disabled by the flood waters are not needed. The flood procedure does call for the plant to be brought from operating U
temperature, about 5800F, to cold shutdown, 200 F, promptly.
I wish to note that it is possible to accomplish that cooldown in about four hours without the cooling towers since the cooldown rate is 0
limited to 100 7 per hour for thermal stress control and the cooldown equipment is designed to be able to maintain such a rate for most of the transient.
Therefore, I concluded that there is sufficient time to shut down the plant safely, in the event of a flood up to and including the
' probable maximum flood.
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