ML20035F104
| ML20035F104 | |
| Person / Time | |
|---|---|
| Site: | 07109221 |
| Issue date: | 04/06/1993 |
| From: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Engel W ENERGY, DEPT. OF |
| References | |
| NUDOCS 9304200268 | |
| Download: ML20035F104 (3) | |
Text
_
I APR C 1933 IMTB:BHW l
71-9221 U.S. Department of Energy i
ATTN: Mr. W. P. Engel Naval Reactors 1
Washington, DC 20585
Dear Mr. Engel:
i This refers to your application dated August 31, 1992, requesting an amendment to Certificate of Compliance No. 9221 for the Model No. NRBK-41 package.
In connection with our review, we need the information identified in the i
enclosure to this letter.
l Please advise us within 30 days from the date of this letter when this information will be provided. Additional information requested by this letter j
should be submitted in the form of revised pages.
If you have any questions i
regarding this matter, we would be pleased to meet with you and your staff.
Mr. Bernard H. White IV is the project manager for our review of your application. Mr. White may be contacted at (301) 504-2455.
j Sincerely, Origing signed E'i Charles E. MacDonald, Chief l
Transportation Branch l
Division of Industrial and Medical Nuclear Safety, NMSS
Enclosure:
As stated Distribution:
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71-9221 Encl. to ltr. dtd. __geR C 1993 Chance in Containment System The MIN-41 inner container is the containment system of the Model No. NRBK-41 package. Replacing the MIN-41 with the HIP-41 inner container is a significant change with respect to the design, operating characteristics, and safe performance of the containment system.
In accordance with 10 CFR 571.13(c), the application should be revised to show that the package, with both the HIP-41 and the MIN-41 containment systems, meets the requirements of 10 CFR Part 71 for a Type B(' )F package.
J Structural Show that the containment vessel will maintain its structural integrity and containment capability under the normal and hypothetical accident conditions of 10 CFR Part 71. Specify the codes and standards that will be used to design and fabricate the containment system.
Containment 1.
The 30 day limit on content holdtime is too short. Revise the i
application to specify a longer holdtime and justify that the longer holdtime is acceptably long. Show how compliance with this longer holdtime limit will be assured during operations. Describe the actions that will be taken if the time is exceeded.
2.
The 0-ring seals in the containment boundary are susceptible to radiation damage. Discuss the margin of safety gy which the seals remain acceptable after a total fluence of 10 Roentgens. Justify the assumption of one gamma ray per disintegration for radioactive isotopes such as Co".
3.
The thermal tests showed that the elastomer seals can maintain their sealing capability for 40 days at 550 *F and 2000 psi. Hotsever, it appears that these test were performed on unirradiated seals. Determine the effect irradiation has on the seal's allowable service temperature and service length.
4.
The application states that a pre-shipment leak test with an acceptance 3
criterion of 1 x 10~3 atm-cm /sec will be performed prior to each loaded shipment. The draft DOE certificate specifies that the double 0-rings on the HIP-41 are to be replaced prior to each loaded shipment.
Revise the application to specify a prq-shipment leak test with an acceptance criterion of I x 10'7 atm-cd/sec.
5.
Revise the application to show that the package meets the special requirements for plutonium snipments in 10 CFR 571.63.
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Thermal i
1.
Specify the maximum normal and accident condition temperatures of the package.
Include the temperatures of the contents, containment. vessel, shielding material, seals, and other safety-related components.
2.
Specify the maximum normal operating pressure (MNDP) and the maximum internal pressure under accident conditions. Show how the pressures were i
calculated. Specify the temperatures that were used to calculate the i
pressures. Also, consider the effects of phase change, gas generation and chemical decomposition of the contents.
3.
The draft DOE Certificate of Compliance specifies internal pressure j
limits for specific temperatures (Condition 5b). Discuss the measures l
that will be taken to assure that the containment pressure does not exceed these limits.
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