ML20148L566
| ML20148L566 | |
| Person / Time | |
|---|---|
| Site: | 07105791 |
| Issue date: | 11/01/1978 |
| From: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Matt W ENERGY, DEPT. OF |
| References | |
| FCTR:WH1, NUDOCS 7811200300 | |
| Download: ML20148L566 (3) | |
Text
.
N
[
(
o,,
UNITED STATES h[
g NUCLEAR REGULATORY COMMisslON e
)<
. j WASHINGTON, D. C. 20555 k;...J
,o$
011978 FCTR:WHL 71-5791 U.S. Department of Energy
~~
~~~ ~'
ATTN: Dr. William E. Mott Washington, DC 20545 Gentlemen:
This refers to your request dated July 1, 1976 to review the Model No. Al-M6 package.
In connection with our review of this package, we need the information identified in the enclosure to this letter.
Please advise us when this information will be provided.
Sincerely,
!gCharlesE.MacDonald, Chief f
Transportation Branch Division of Fuel Cycle and Material Safety
Enclosure:
As stated cc:
DOE, Albuquerque Operations Office ATTN: Mr. Jack R. Roeder P.O. Box 5400 Albuquerque, MN 87115 78112003oo
u Model No. Al-M6 Shipping Container NOV 011978 Enclosure to ltr dtd.
DRAWINGS AND SPECIFICATIONS 1.
Provide Mound Research Corporation Drawing No. AYD750148 for the Model No. Al-M6 shipping container.
The drawing should identify all significant safety features, e.g., dimensions, materiais of construction, welds and seals.
2.
Provide the Acceptance and Reuse Inspections specification, Mound Research Corporation Drawing No. SPA 740977.
STRUCTURAL Provide an assessment of the Model No. Al-M6 containment vessel for the 30 foot bottom end drop.
CONTAINMENT Show that the containment capabilities of the package following normal conditions of transport and accident damage conditions are sufficent for packaging containing plutonium oxide power.
Regulatory Guide 7.4 should be used to develop an acceptable test to demonstrate adequate containment for the packaging subjected to the accident damage test sequence. The test or analysis must address the actual environment predicted for the accident damage test sequence.
We also note that the requirements of 10 CFR 971.42 should be addressed.
TESTING AND MAINTENANCE Discuss the leak testing and maintenance program to be used to ensure the package containment capability initially and undei continued use.
Tests should include initial, periodic and preshipment leck tests to be used on the containment system.
The maintenance schedule should include the inspection, test and replacement schedule for components that comprise the containment systems.
Regulatory Guide 7.4 may be used for leak tests before first use and for periodic leak testing.
For assembly verification testing, it is recommended that a test of sufficent sensitivity to detect a leak I
of lx10 3 3
atm-cm /sec be used.
The leak tests should be applied to the I
containment vessel and the separate inner container as defined in 10 CFR 571.42.
l 1
s a
, CRITICALITY In order for any package to qualify as Fissile Class I it is necessary to demonstrate that the requirements of 10 CFR 971.38 are met.
In practice, Fissile Class I indicates that controls for criticality in transport are not required. This is possible since there is essentially no neutron interaction between packages under normal conditions of transport and at least 250 damaged packages are subcritical.
It should be recognized that Fissile Class I packages could be commingled with other Fissile packages.
In the case of the subject package it has not been shown that any number (infinite array) of packages are subcritical for the normal conditions of transport.
In this regard, we need a description of the criticality model and analysis and results which support a Fissile Class I designation.
i