ML19224A996
| ML19224A996 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/27/1979 |
| From: | Coffman F Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TASK-TF, TASK-TMR NUDOCS 7906130394 | |
| Download: ML19224A996 (1) | |
Text
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f UNITED STATES
['
'k NUCLEAR REGULATORY COMMISSION 1
E, WASHINGTON, D. C. 20555
/
APR 2 71979 NOTE TO:
Files FROM:
F. D. Co ffman, Section Leader, RSB, D0R 4
SUBJECT:
RECORD OF ACTIONS, THREE MILE ISLAND ACCIDENT I
Per the instructions given by H. R. Denton in his memorandum to the NRR Staff, same subject, April 24, 1979, the following communications are logged.
In the afternoon of March 29th, W. Hodges, AB/ DSS, called from the Incident response Center to get an estimate of the heat generation rate 'a the TMI-2 core coming from the oxid'ation of the fuel cladding.
He stated the core conditions were that the temperatures above the bundles were 600 F, the inlet i.emperature was 280 F, and the saturation temperatures for the current vessel pressure was 540 F.
After consulting with Dr. M. Picklesimer, FBRB/RSR, about the MATPRO 1
handbook, TREE-NUREG-ll80, Version /D, Figure B.16-8 (Heating per meter
~
for a rod of initial diameter 1.25 x 10-2 M as a function of temperature i
for various initial oxide thicknesses), I provided W. Hodges with the following summa ry:
The heat generation rate depends upon the initial oxide l
thickness, the cladding radius, the temperature variant heat of reaction, the duration of the cime step, and the
~
cladding temperature.
If the cladding temperature were 600"F, then the instantaneous heat rate is less than E-1 N/M.
If the cladding temperature were 1200 F, then th( instantaneous heat rate is less than 3 KW/M but will rapidly drop to less than i KW/M (about.1 KW/M). What-r ever tne tenperature, the heat rate due to oxidation will last only as long as there is cladding to oxidize.
2; S
In the evening of March 29th, '.. Noonan, EB/ DOR, called to determine the K'
estimated number of fuel rods in TMI-2.
I told him that I did not have E-documents in front of me at home, but, from memory, there should be 177 fuel bundles in TMI-;' each cantaining about 200 fuel rods.
C D. Cof m n, Section i.eader b
r Re n.or Safety Branch J^)Y D. Crutchfield /
180 356 cc:
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