ML19220C632
| ML19220C632 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/04/1979 |
| From: | Marino G NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| Shared Package | |
| ML19220C630 | List: |
| References | |
| NUDOCS 7905110351 | |
| Download: ML19220C632 (3) | |
Text
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W. Y. Johnston. Chief MEHORANDUM FOR: Fuel, Behavior Research Branch G. P. Marino FRO 4:
Fuel Behavior Research Branch
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MAXIMUM STEADY-STATE CLAD TEMPERAT
SUBJECT:
TMI PLANT AFTER YOIDING kcording to current sequence of events' reports rece1ved b
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d for personnel, the THI reactor core may have been initially unco At this time no hours into the transient.
stored energy should be left in the rods and the clad and fuel approximately one hour at 1 ld be tures at the decay power level (apprgximately 1 percent) shouU essentially that of the coolant (556 F).
f the simple matter to calculate the maximum obtai i
surroundings.
When the core is in static steam, the fuel rods will begin to he by since the heat removal rate will be less than th use, ft was found that a given rod will heat up a decay heat.
h t of and a HTC of 5 BTU /HR-ft - F 1% for initial rod er of 11kw/ft be Such a rate would a low the steady-state temperature of cla the heat reached in approximately 5-10 minutes.
reached is easily calculated by equating the little over 5-10 minutes).
i.e., Heat generated (in flux units) = H (Tclad - Tconj)'
i The resulting calculation yielded the following equation i
attainable cladding temperature of the TMI core for voidin mately 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> into the transient.
y 556 + 30319 P T
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H clad 7505110 3 5/-
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- ft 0 4 gy P is the power in br/ft. H the HTC from clad to steam in BTU /HR-The equation is plotted as T versus P in w,}re#, and T in degrees F.
FT -F Note that for an initial rod power of figure 1 for various values of H.a decay heat fractional power of 0.01 (i.e 10kw/ft,and the maximum temerature obtainable for H's of 5, 4. 3. 2.5 and 2 arePicklesimer 1160F,1320F,1560F,1770F, and 2080F at steady-state.
curve of zircaloy oxidation damage (based on kissner's work) indicates that to oxidize clad sufficiently in an hour so Qat it guld not sur-This vive themal shock, the temperature would have to be 2010 F.
requires a HTC 1ess than 2.5 foi the TMI conditions. 'This is an ex low hTC and will probably only occur in very stagn have kept the HTC near 5.0 and prevented serious damage to evetn the hottest rods of the core.
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G. P. Marino
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Fuel Behavior Research Branch s
Division of Reactor Safety Research cc:
L. S. Tong D. Hoatson H.. Scott R. Van Houten W. Beckner Y. Y. Hsu R. Sherry M. L. Picklesimer S. Fabic Z. Rosztoczy J. Volglewede G. L. Bennett C. Johnson DISTRIBUTION _
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