ML20239A159
| ML20239A159 | |
| Person / Time | |
|---|---|
| Site: | 07109168 |
| Issue date: | 09/01/1998 |
| From: | Steve Jones CHEM-NUCLEAR SYSTEMS, INC. |
| To: | Chappell C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20239A162 | List: |
| References | |
| 579-077-98, 579-77-98, NUDOCS 9809080276 | |
| Download: ML20239A159 (4) | |
Text
_ - _ - _ - _ _
7 1 - M fc e
HEM-NUCLEAR SYSTEMS 140 Stonondge Drive
- Columbia. South Carolina 29210 * (803) 256-0450 4
September 1,1998 579-077-98 Mr. Cass R. Chappell, Section Leader Cask Cenification Section Storage and Transport Systems Branch Division ofIndustrial and Medical Nuclee Safety, NMSS U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Chappell:
St' 4-SAFETY ANALYSb l* ' ORT FOR CilEM-NUct. EAR MODEL NO. CNS 8-1208, REY. 2 Enclosed is our application for the subject revision to the Safety Analysis Report (SAR) for the CNS 8 -
120B, Certi6cate of Compliance No. 9168. We request that you amend the Certificate for the CNS 8-120B to reDect the attached Rev. 2 changes to the SAR.
The purpose of this Revision f. is to correct Section 4.5 of the SAR," Periodic Leak Rate Determination Using R-134a Gas." Section.6 was added to the SAR in our February 1994 submittal ta permit R-134a a
to be used as an optional periodic leak test gas. Ilowever, the calculations in Section 4.6 incorrectly used material propenies given in ANSI N14.5 - 1987 for sulfur hexafluoride (SF ) as the propenies for R-6 134a. This submittal uses the material properties for tetra 0uoroethane instead, which is the correct chemical compound for R-134a. Attachment 4.1 has also been added to provide information on R-134a and its material properties since tetranuoroethane is not referenced in ANSI N14.7.
ADer approval of our February 1994 submittal allowing the use of R-134a as a test gas, the results of the calculations in Section 4.6 were incorporated into our test procedure for the CNS 8-120B that speciGes the allowable leak rate for R-134a and detector sensitivity requirements for the annual leak test. When the erroneous leak rate was recently discovered, we re-performed the annual leak test using the R-12 gas.
We also evaluated the safety consequences of having performed the annual leak test on the CNS 8-120B l
using an incor' ect allowable leakage rate for R-134a. This evaluation, which was performed under j
r Chem-Nuclear's Quality Assurance Program, consisted of assessing shipments made in the 8-120B casks i
since we began using the R-134a gas for the annual testing, and concluded that there were no significant safety issues resulting from this. We have also revised our annual leak test procedure to remove testing with the R-134a gas until this Rev. 2 submittal is approved by the NRC.
It should be noted that the calculations in Section 4.6, Rev. 2, use formulas presented in ANSI N14.5 -
1987Property "ANSI code" (as page type) with input value "ANSI N14.5 -</br></br>1987" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process., llowever, there is a significant deviation from ANSI N14.5 - 1987; based on NUREG CR5403 and discussions with NRC staff, all flow is assumed to be non-choked (laminar), and only non-choked flow f
i equations from ANSI N14.5 - 1987 are used. It is our understanding that this is consistent with ANSI kh k {)
N14.5 - 1997, which has nc! been published yet.
' Section 4.5, in which the calculations are presented for the periodic veri 6 cation leak test for R-12 gas, was revised to also use the non-choked How equations as discussed in the paragraph above. This w'as 9909090276 990901 5 PDR ADOCK 07109168 k
8 C
PDR g i
L
l i-Mr. Cass R. Chappell Page Two done so that these ca'culations are consistent with the calcu!stions for the Rev. 2 Section 4.6 for the R-134a gas.
. The following attachments are included with this submittal: : Attachment 1 is a directory of changes to the SAR showing which pages should be re-moved from Rev. I and added to the SAR to incorporate Rev. 2. : This attachment contains the revision pages for Rev. 2 to the SAR.
L:
Should you or members of your staff have any questions about the application, please feel free to contact Mr. Charles Witt at (803)7581890.
Sincerely,
\\
I
\\W Scotty W. Jones Assistant Licensing Manager Attachments:
(1) Directory of Rev. 2 Changes (2) Rev. 2 Change Pages l
L-l l
l i
Directory of Changes for Incorporating Rev. 2 CNS 8-120B Safety Analysis Deport Remove These Pages Insert These From Rev.1 Rev. 2 Pages Cover Sheet Cover Sheet V
V X
X 4 - 15 thru 4 - 35 4 - 15 thru 4 - 26 4 - 27 (Appendix 4.1) 8-2 8-2 i
l
Rev. 2 Change Pages i
l l
L------- -----
---