ML19340C614
| ML19340C614 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/17/1979 |
| From: | Bernero R NRC - NRC THREE MILE ISLAND TASK FORCE |
| To: | Frampton G NRC - NRC THREE MILE ISLAND TASK FORCE |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8012110557 | |
| Download: ML19340C614 (2) | |
Text
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i December 17, 1979 Note to:
George Frampton From:
Bob Bernero In response to your questions, I offer the following:
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Question 1 - When did Region I learn hot leg temperatures above saturation?
Answer
- The first clear record that Region I knew of superheated steam I
conditions was Gallina's report at 2:55 p.m. (IMF-C-17) where it was reported that:
P = 450 psig Th = 550 which means there were 90-100 degrees F of superheat.
Question 2 - When did Bethesda learn of hot leg temperatures above saturation?
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Answer
- At 12:34 p.m. the HQ Field Comunicator recorded:
l P = 1100 psi 0
T = 560 F h
0 T = 560 F c
0 which would be about 3 F of superheat. A reasonable man would call these saturation conditions, not superheat.
l At 2:15 p.m. the HQ Field Communicator recorded:
P = 500 psi l
h=600%
l T
l which would be about 125"F of superheat.
I Question 3 - When did NRC learn about supersaturation conditions?
i Answer
- Supersaturation means superheat.
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2-Ouestion 4 - Is it true that there is no way to get temperatures above the saturation point without the core being uncovered?
Enswer
- Yes, th? core is the only heat source in the RCS. It is therefore the heat source to boil the water and the heat source to further heat the steam produced. Substantial superheat means a substantial length of fuel in the top of the core is covered only by steam.
Bob Bernero cc:
R. DeYoung R. Haynes W. Ballaine i
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