ML20210K525
| ML20210K525 | |
| Person / Time | |
|---|---|
| Issue date: | 07/30/1999 |
| From: | Hodges M NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Boyle R TRANSPORTATION, DEPT. OF |
| References | |
| NUDOCS 9908060155 | |
| Download: ML20210K525 (2) | |
Text
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.s-l UNITED STATES f
j NUCLEAR REGULATORY COMMISSION t
WASHINGTON, D.C. 20e66 4001
\\*****/
July 30, 1999 Mr. Richard W. Boyle, Chief Radioactive Materials Branch Office of ' Hazardous Materials Technology U.S. Department of Transportation 400 Seventh Street, SW Washington, DC 20590
SUBJECT:
ERRORS IN IAEA SAFETY SERIES NO. 37
Dear Mr. Boyle:
lAEA Safety Series No. 37, Advisory Material for the IAEA Regulations for the Safe Transport of Radioactive Materials, describes the effects of forced convection in a pool fire for the fire test j
that is required for certification of transportation packages.
In paragraph A-628.20, on page 93, the Safety Guide cites the Colburn correlation for a forced convective heat transfer coefficient from a textbook by McAdams entitled " Heat Transmission."
This textbook is copyrighted 1954, and the Colburn correlation is not the most recent correlation i
available for determining the values for forced convection in a regulatory fire.
In addition to these facts, in the Safety Guide, the Colburn correlation is given as:
j u = 0.036 (Prandtl Number) (Reynolds Number)*8 it appears that the formula should read:
i Nu = 0.036 (Prandt! Number) (Reynolds Number)'8 The correlation is used for convection along a flat plate with mixed boundary layer conditions (laminar and turbulent) and is for the average heat transfer along the plate, it cannot be used k
for local calculations.
'D A more recent heat transfer correlation, such as the Churchill-Bernstein correlation, provided
/
below, could be used for determining the forced convection heat transfer coefficient for flow about a cylinder. The Churchill-Bernstein equation is:
m - Gs QD 1
0.62 Re"Prm
/
Re 3
y Nu = 0.3 +
( 2.82 X 10' )
p g
T A - I ' 1)
I 060033 9908060155 990730 PDR ORG NOMA PDR
I R. Boyle This equation is provided in incropera and Dewitt," Fundamentals of Heat Transfer," Second Edition, Page 336.
From the equation above, the heat transfer coefficient for forced convection, h, is determined from the Nusselt (Nu) number. As a minimum, this misprint should be corrected. Additionally, it may be appropriate to use a more recent equation.
)
Please contact me if you have any questions.
Sincerely, ORIGINAL SIGNED BY /s/
M. Wayne Hodges, Deputy Dires 'or Technical Review Directorate Spent Fuel Project Office Office of Nuclear Material Safety and Safeguards DISTRIBUTION:
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