ML19220C637
| ML19220C637 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/06/1979 |
| From: | Beckner W NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| Shared Package | |
| ML19220C630 | List: |
| References | |
| NUDOCS 7905110363 | |
| Download: ML19220C637 (2) | |
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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'* g W ASHINGTON, D, C. 20555 APR 6 1979
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MEl10RANDUM FOR: File William D. Beckner Separate Effects Research Branch FROM:
PRELIMINARY CALCULATIONS OF THREE
SUBJECT:
CORE DAMAGE to Initial attempts have been made to bound the po id with high exists that the core was covered with saturated flu the core.
At 1.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, the main coolant pump wa flow rates.
d Superheat in the hot leg and subcooling in the cold leg w this time.
This suggests little or no coolant as well as a pressure drop.
flow and an at least partially voided core.
To bound the damage, an assumption of a completelg* voide (lower limit witn a heat transfer coefficient of 3.0 Btu /hr-ft._ F Under these based on calculations of Y. Y. Hsu on 4/6/79).
Fuel assumptions and making use of information developed by the 4/4/79),
Behavior Research Branch (letter, Marino b ut 25% of This represents about 11-13 Kwt/ft would be damaged.
This should represent a good u_om the core volume near the center.
bound on core damage,at this time.
During later time periods (8-14 hours), similar dry conditio could have lasted for significantly longer periods and steamA Up to 40% of the core volume temperatures may have been higher.
10 Kw/f t cauld also have been damaged.
could have been damaged.
f These numbers are scoping calculations based on a lim information and some assumptions. Updated calculations will be perfo damage was possible.
information becomes available.
L!dba b $<W William D. Beckner Separate Effects Research Branch Division of Reactor St if Research cc: see next page 7905110 3 4 3 gg jjo