ML18136A486
| ML18136A486 | |
| Person / Time | |
|---|---|
| Site: | 07109338 |
| Issue date: | 03/31/2018 |
| From: | Vaughan R Croft Associates Limited |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML18136A483 | List: |
| References | |
| TAC L24678 CTR 2018/01 | |
| Download: ML18136A486 (17) | |
Text
SAFKEG-HS 3977A CTR 2018/01 Docket Number 71-9338 Issue A Page 1 of 17 SAFKEG-HS 3977A SARP Update Matrix for Thorium Target Title SAFKEG-LS 3977A SARP Update Matrix for Thorium Target Number CTR 2018/01 Issue A
File Ref CTR2018-01-A-v3-Update matrix for Thorium target Compiled Checked R A Vaughan A L Ferguson Approved Issue Date 31 Mar 2018 R A Vaughan Croft Associates Ltd, F4 Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB. 01865 407740
SAFKEG-HS 3977A CTR 2018/01 Docket Number 71-9338 Issue A Page 2 of 17 Contents 1 Notes on methodology and content............................................................................................................................. 3 2 Reason for the changes in the SARP in updating from Rev 13................................................................................... 3 3 SARP Changes............................................................................................................................................................ 4 4 NRC Questions and Croft Responses........................................................................................................................ 14 Appendix A New or edited Supporting Documents provided in the SARP from Rev 13...................................... 15 Appendix B Contents Type CT Thorium Target............................................................................................. 16
SAFKEG-HS 3977A CTR 2018/01 Docket Number 71-9338 Issue A Page 3 of 17 1 Notes on methodology and content This Update Matrix document (CTR 2018/01) details the changes in the SAFKEG-HS 3977A SARP in updating from Rev 13 to Rev 14.
This SARP update is to allow Thorium targets to be carried in the package as new Contents Type 6 (CT-6).
This Update Matrix document will be updated during the NRC review process to include responses to questions from the NRC, thereby fully documenting all changes made during the entire SARP update.
Minor editorial changes in the SARP to clarify and correct errors are also detailed in this Update Matrix document.
This Update Matrix document (CTR 2018/01) provides the following in updating from Rev 13 for the addition of Thorium targets.
Details of SARP supporting document changes proposed with reason for the change - Table 1 Question and Response Matrix - Table 2 (this includes all the updates made to the SARP to answer all the questions posed by the NRC)
List of new or edited supporting documents provided in the SARP - Table 3, Appendix A Explanation of the approach taken for new contents type CT-6 (radioactive thorium target) - Appendix B.
2 Reason for the changes in the SARP in updating from Rev 13 Ac-225 is being developed for medical purposes and LANL have developed a methodology of producing Ac-225 by irradiating of a thorium target in a proton beam. The SAFKEG-HS 3977A has been identified by LANL as appropriate package for shipping irradiated thorium targets and Croft have been contracted to have irradiated thorium targets added to the SARP.
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 4 of 17 3 SARP Changes This table contains notes on all the SARP Page Changes and supporting Document Changes.
Table 1 Summary of SARP Changes and Supporting Document Changes for Rev 14 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Sections 0 to 8 Throughout the SARP The Rev status has been updated to Rev 14 for all SARP pages and not just pages with changes.
This change has been made to simplify management of the SARP for which master documents are electronic Word documents. This change reduces the potential for editorial errors and also facilitates the production of pdf copies produced for reviewers (simplified as each Section will be complete and not just be separate pages All changes to the SARP from the previous revision are shown in the Compare documents provided for each Section.
Throughout the SARP These are shown in the Compare documents provided for each Section.
Editorial changes have been made to correct errors, standardise terminology, etc.
To correct errors, standardise terminology, etc.
All pages Header throughout the SARP Footer throughout the SARP Page Rev status amended to Rev 14 for all pages.
Changes required solely to change from page control to document control to facilitate future update.
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 5 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Filename updated and date removed Date not needed as it is the same for all pages as shown in Section
- 0.
Section 0 - Contents Page 0-2 Table Updated for Rev 14 Editorial Section 0.2 Page status changed throughout Update to of Rev Documents in Section 1.3.3 Headings have been added for the drawings for each version of the CV.
The drawings for the Sealed Split Lid Version of the CV have been added.
This change is required to accommodate a thorium target.
Documents in Section 3.5.2, Appendix The document references, status and titles have been edited (for those docs having an External Report Number (ETR #) added).
The ETR #s and eFilenames have been added to facilitate finding electronic copies of these documents (they did not have Ref
- s).
Documents in Section 4.5.2, Appendix Details for CS2018/01 added Section 1 - General Information Pages - various Throughout Section Editorial changes made as necessary for addition of the sealed split CV lid.
Editorial and clarification Page 1-3 Section 1.2.1.3 Edited to add the CV seal plug having an O-ring seal.
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 6 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 1-3 Section 1.2.1.3, 5th para Details of the sealed split CV lid added For new Contents Type CT-6 Page 1-4 Section 1.2.1.4 New Figures referenced Page 1-4 Section 1.2.1.5 New Figures referenced Page 1-8 Figure 1-1c added Depicting split CV lid Page 1-8 Details of the package with sealed split CV lid added For new Contents Type CT-6 Page 1-12 Figure 1-2c added Shows new sealed split CV lid Page 1-16 Figure 1-3c added Shows new sealed split CV lid Page 1-19 Figure 1-4c added Shows new sealed split CV lid Page 1-21 Table 1.1 Contents mass limit for sealed split CV lid added For new Contents Type CT-6 Page 1-24 Table 1.2 CTs renumbered CT-3 Gas reinstated [as Rev 11 of the SARP]
CT-6 added Editorial adjustment Deleted from the SARP at Rev 13 in error.
For new Contents Type CT Thorium target Page 1-27 Table 1.3.3 CT-3 Gas reinstated [as Rev 11 of the SARP]
Deleted from the SARP at Rev 13 in error.
Page 1-30 Table 1.3.6 CT-6 added For new Contents Type CT Thorium target Page 1-35 Table 1.4.3 CT-3 Gas reinstated [as Rev 11 of the SARP]
Deleted from the SARP at Rev 13 in error.
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 7 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 1-38 Table 1.4.6 CT-6 added For new Contents Type CT Thorium target See also Appendix B Page 1-46 Section 1.3.3.3 added Drawings for the package having the new sealed split CV lid added For new Contents Type CT Thorium target Section 2 - Structural Evaluation Pages 54, 2-55, 2-58, Table numbering corrected.
Editorial Section 3 - Thermal Evaluation Page 3-4a Section 3.1.3, 4th para Comment on temperatures for CT-6 added.
For new Contents Type CT Thorium target Page 3-23 Section 3.5.2 Document references ETR added for MURR reports and Mallinckrodt report.
The ETR #s have been added to facilitate finding electronic copies of these documents (they did not have Ref #s).
Section 4 - Containment Evaluation Page 4-1 and elsewhere Section 4.1, 1st para and elsewhere Edited to accommodate new sealed split CV lid For the new package assembly for CT-6.
Page 4-3 Figure 4-3 Figure 4-3 added.
For the new sealed split CV lid for CT-6.
Page 4-4 Table 4-1, note (2) and last para.
Note re dose rate for CT-4 added.
For the new package assembly for CT-6.
Page 4-5 Section 4.2.2, 2nd and 3rd paras.
Edited for reinstatement of CT-3 (gas) and CT-6 (thorium).
Editorial for reinstatement of CT-3 and new CT-6.
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 8 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 4-6 Section 4.2.4, 4th to 7th paras.
Edited for reinstatement of CT-3 (gas) and CT-6 (thorium).
Editorial for reinstatement of CT-3 and new CT-6.
Page 4-7 Section 4.3.2, 2nd to 4th paras.
Edited for reinstatement of CT-3 (gas) and CT-6 (thorium).
Editorial for reinstatement of CT-3 and new CT-6.
Page 4-8, 4-9 Section 4.3.4.2, 3rd and 4th paras.
Edited for reinstatement of CT-3 (gas).
Editorial for reinstatement of CT-
- 3.
Page 4-9 Section 4.4.1, 3rd para.
Requirements for testing the plug/body seal of the split lid sealed plug added.
For the new sealed split CV lid for CT-6.
Page 4-9 Section 4.4.2, 3rd para.
Requirements for testing the plug/body seal of the split lid sealed plug added.
For the new sealed split CV lid for CT-6.
Page 4-9 Section 4.4.3, 3rd para.
Requirements for testing the plug/body seal of the split lid sealed plug added.
For the new sealed split CV lid for CT-6.
Page 4-10 Section 4.4.4, 3rd to 5th paras.
Edited for renumbering the CTs and comments on not require a leak test for new CT-6.
For the new sealed split CV lid for CT-6.
Page 4-11 Section 4.5.2 Reference for new calculation sheet CS 2018/01 added.
For the gas contents of new CT-6.
CS 2018/01 Append to Section 4 New calculation sheet CS 2018/01 added.
For the gas contents of new CT-6.
Section 5 - Shielding Evaluation Page 5-1 and elsewhere Section 5.1.1, 1st and 3rd paras.
Editorial re references, figure and table numbering.
Add references and figures for the new sealed split CV lid for CT-6.
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 9 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 5-3 Figure 5-2 Figure 5-2 edited to not show the Insert.
The figure shows the shielding but not the insert which does not provide significant shielding.
Page 5-43 Figure 5-3 Figure 5-5 added Shows new sealed split CV lid Page 5-10 Section 5.3.1, three paras following Table 5-3.
Information re MNCP calculations for CT-6 added.
For new CT-6 Page 5-10 Section 5.3.2 Data for neutron sources removed.
None of the radionuclides specified in the contests emit neutrons.
Page 5-11 Section 5.4.1 Editorial changes Clarification Page 5-11 Section 5.4.1, 5th para Information re MNCP calculations for CT-6 added.
For new CT-6 Page 5-12 Table 5-4 Last row of table Editorial [spelling]
Information re MNCP calculations added.
Correction For new CT-6 Page 5-19 Figure 5-14 Figure 5-14 added to show Thorium target locations for MCNP Model For new CT-6 Page 5-22 Section 5.4.2, after Table 5-6 Ref to materials properties for CT-6 added.
For new CT-6 Page 5-23 Section 5.5.1 Ref to calculation method for CT-6 added.
For new CT-6
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 10 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 5-23 Section 5.5.2 Ref to calculations for CT-6 added.
For new CT-6 Page 5-23 Section 5.5.3 Ref to dose rate conversion for CT-6 added.
For new CT-6 Page 5-28 Section 5.5.4.3 Details of 5.5.4.3 MCNP calculations for thorium target added.
For new CT-6 Page 5-32 Section 5.5.6 Ref for new calculation report for CT-6 /01 added.
For new CT-6 Atkins 5163778-HS-REP-001-001 Append to Section 5 New calculation report for CT-6 added.
For new CT-6 Section 6 - Criticality Evaluation Page 6-1, 6-2 Section 6 All details removed.
Consistency and clarification.
The contents of this package are non-fissile and therefore no evaluation for the safety of fissile contents is required.
Section 7 - Operating Procedure Page 7-1 Section 7, 5th para Editorial Clarification Page 7-2 Section 7.1.1 - title & para 8)
Editorial Clarification Page 7-3 Section 7.1.1 - para 11)
Drawing info added For new sealed split lid CV Page 7-4 Section 7.1.2 - para 7)
Editorial Clarification Page 7-5 Section 7.1.3 - Note Editorial Clarification
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 11 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 7-6 Section 7.1.4 - all paras Loading requirements added for sealed split lid CV For new CT-6 Page 7-7 Section 7.1.5 - title & para 4)
Editorial Clarification Page 7-7 Section 7.1.5, 1)
Editorial To be consistent with ANSI N14.5 Section 7.6.4 acceptance criterion Page 7-8 Section 7.2 1st para Section references added Clarification & for new CT-6 Page 7-9 Section 7.2.2 - paras 1) & 6)
Editorial for contamination added Clarification Page 7-10 Section 7.2.3 - paras 1) & 6)
Editorial for contamination added Clarification Page 7-11 Section 7.2.4 - all paras Unloading requirements added for sealed split lid CV For new CT-6 Page 7-14 Section 7.3,2 para 12)
Requirement added to ovoid damage Consistency Page 7-14 Section 7.1.4 - all paras Loading requirements added for sealed split lid CV For new CT-6 Page 7-14 & 71-15 Section 7.3.3 - all paras Requirements added for shipment of empty package having a sealed split lid CV For new CT-6 Section 8 - Acceptance Tests & Maintenance Program Page 8-1 Section 8, 4th para Para added Consistency with Section 7 Page 8-2 Section 8.1.2 Drawing info added For new sealed split lid CV and clarification Page 8-2 Section 8.1.3 - 2nd para as specified added Clarity
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 12 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 8-2 Section 8.1.4 - 1st para Editorial For new CT-6 Page 8-3 Section 8.1.4 penultimate para Leak testing requirements added for new sealed split lid CV For new CT-6 Page 8-3 Section 8.1.5.2 - 3rd para Editorial For new CT-6 Page 8-4 Section 8.1.5.5 and 8.1.5.6 Drawing info added For new sealed split lid CV and clarification Page 8-6 Section 8.2 - 4th para as specified added Clarity Page 8-7 Section 8.2.2.3 - all paras Loading requirements added for sealed split lid CV For new CT-6 Page 8-8 Section 8.2.3.1 - 2nd paras Drawing info added For new sealed split lid CV and clarification Page 8-8 Section 8.2.3.2 - para 3) as specified added Clarity Page 8-9 Section 8.2.3.2 - para 8) as specified added Clarity Page 8-9 Section 8.2.3.3 - title Editorial Clarification Page 8-9 Section 8.2.3.3 - para 6)
Drawing info added For new sealed split lid CV and clarification Page 8-10 Section 8.2.3.3 - para 7)
Reference added to the section giving the leak test requirements rather than repeating them Consistency Page 8-10 Section 8.2.3.3 - para 8) as specified added Clarity Page 8-10 Section 8.2.3.4 - para 2) as specified added Clarity Page 8-11 Section 8.2.3.5 - para 6) as specified added Clarity Page 8-11 Section 8.2.3.6 - para 2) as specified added Clarity
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 13 of 17 Summary of SARP Page Changes and Supporting Document Changes for Rev 14 SARP Page or Doc Location Change Reason for Change Page 8-11 Section 8.2.3.7 - title para 2)
Editorial as specified added Clarity Page 8-12 Section 8.2.5.3 as specified added Clarity Page 8-13 Table 8-1 Insert O-ring added Split lid sealed plug O-ring Completeness For new sealed split lid CV
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 14 of 17 4 NRC Questions and Croft Responses This section is provided to document all NRC Questions and Croft Responses.
Table 2 - Question and Response Matrix Table Q#
Review Question Croft Response Changed Item None at this time
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 15 of 17 Appendix A New or edited Supporting Documents provided in the SARP from Rev 13 Supporting Documents provided in the SARP at Rev 14 Table 3 - New or edited supporting documents provided in the SARP Related SARP Section or Doc Document Reference Title Section 1 - General Information Documents in Section 1.3.3, Licensing Drawings Addition 1C-7940 A
Cover sheet for Safkeg-HS Design No. 3977A - Sealed plug Addition 0C-7941 A
Safkeg-HS Design No. 3977A - Sealed plug Addition 0C-7942 A
Keg Design No. 3977 - Sealed plug Addition 0C-7943 A
Cork set for Safkeg-HS - Sealed plug Addition 1C-7944 A
CV Design No. 3978 - Sealed plug Addition 1C-7945 A
CV lid - Sealed plug Addition 1C-7946 A
CV body - Sealed plug Addition 1C-7947 A
Containment vessel plug - Sealed plug Documents in Section 1.3.4 Supporting Documents Update PCS 038 I
Package Contents Specification for Safkeg-HS - Package Design No 3977A Section 5 - Shielding Evaluation Addition CS 2018/01 A
SAFKEG-HS 3977A - Gas contents limit for leaktight condition - Thorium target Documents in Section 5.5.2 Addition Atkins report:
5163778-HS-REP-001-001 Iss 001 HS Container Shielding Assessment with Thorium Target
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 16 of 17 Appendix B Contents Type CT Thorium Target This appendix is provided to explain the approach taken for contents type CT-6 which is for a radioactive thorium target.
The radioactive content of the thorium target arises from proton irradiation at typically 200 uA for > 1 day to produce nominally 0.2 Ci Ac-225 at EOB [End Of Beam - removal from the proton beam]. The target is allowed to decay for at least 24hour after EOB to allow short halflife radionuclide to decay and reduce the radiation dose from the target. LANL and BNL propose to irradiate similar thorium targets with similar but different proton beam energy, current and time.
The radionuclides produced by proton irradiation have been calculated using MCNP by both LANL and BNL - the LANL situation produces higher secondary nuclides [the principal being Ac-225] - the results are given in SARP Section 1.3.4.
The results of the Monte Carlo shielding calculations, for the radionuclides present in nominally
>0.5% of total activity at EOB in a typical thorium target, are reported in Atkins report 5163778-HS-REP-001-001 (Section 5.5.2). The calculations determine the dose rate at the base of the package for 1 Ci of each nuclide listed in the contents (which is the location of the highest external surface dose rate).
Under NCT and HAC, it is assumed that the contents (thorium target) are contained in the CV cavity by the form of the thorium metal and sealed Inconel housing (and product container where used) and by the seal system provided by the CV and sealed split CV lid with the target being restrained to sit in the axial centre of the CV cavity.
The dose rate at the base of the package for a typical thorium target (thorium metal disc in Inconel housing) has been calculated for the radioactive content of the thorium target from proton irradiation at LANL with 24h decay after EOB. The data is presented in PCS 038 (see SARP Sections 1.3.4 and 5.5.4.3).
The calculations of the radionuclides produced by proton irradiation indicated a very large number of radionuclides but with most in small quantities and most individually < A2. Also, many radionuclides have short halflives. It is recognized that there may be variations in the radionuclide content due to variations in the exact composition of both the thorium metal disc in Inconel housing and to the irradiation parameters (proton beam energy, current and time), which would produce package external dose rates which would differ to some extent.
The shielding calculations reported in PCS 038 (based on Atkins report 5163778-HS-REP-001-001 (Section 5.5.2) show that the dose rate on the external surface of the package may be close to the non-exclusive use regulatory limit of 2 mSv/h but will be within the Exclusive Use limits for a shipment. The calculated maximum package dose rate for the activated LANL thorium target is 5.26 mSv/hr at 1 day from EOB: this reduces to 1.52 mSv/hr at 2 days from EOB.
The package maximum surface dose rate, heat output, #s of A2 and mass of radioactive material for a thorium target activated in the LANL proton accelerator are given in SARP Section 1, Table 1-4-6 [taken from PCS 038]. It can be seen that most of the radionuclides are present in <A2.
SAFKEG-HS 3977A Docket Number 71-9338 CTR 2018/01 Issue A Page 17 of 17 These are considered to be typical for such activation. A calculation of the activation in the BNL proton accelerator also for 0.2 Ci Ac-225 at EOB (same as for the LANL case) showed that the secondary radionuclides would be present in smaller quantities than calculated for the LANL case.
Considering the factors that affect package safety, it is noted that for the typical activated thorium target (the LANL case) the data in PCS 038 (see SARP Section 1.3.4) shows the following.
- The heat output is < 1W (the package is design for a maximum of 30W).
- Only 12 nuclides are present at > A2 quantities with the total for the target being 76 A2s.
- The halflives are short with the longest being 10 days for Ac-225.
- The maximum dose rate at the package surface is less than the regulatory limit of 10 mSv/hr for shipment under Exclusive Use - this may require decay of just a little more than 24 hr as the conservatively calculated dose rate at 24 hr from EOB is 10.7 mSv/hr.
- Radioactive gases are present in less than the allowable limits calculated for gas leakage (at ~2% of allowable leakage rate of 10-6 A2/hr).
- Total mass of radioactive nuclides is < 1g - all distributed though the thorium and Inconel metal parts of the target.
As noted above, the calculated heat output, gas leakage, and radiation dose are within the package and regulatory limits with the dose rate being closest to the regulatory limit.
As the nuclide content of the thorium target can vary, but with the calculated dose rates being within the regulatory limit, it is proposed that the criteria for allowing shipment be as follows.
- The maximum activity of Ac-225 shall be up to 7.9 GBq (0.2 Ci) with other radionuclides arising from proton irradiation of the thorium target in its Inconel housing.
- The external dose rate on the package (top, side and bottom) shall be monitored and the package may not be shipped if this exceeds 10 mSv/hr.
It is proposed that only the activity of Ac-225 (being the principal radionuclide of interest) be reported on the shipping labels and documentation and the there is no need to the shipper to establish that the limit for the radionuclides calculated to be in the thorium target are less than specified limits.
Appropriate conditions have been added in the SARP in Section 1, Table 1-3-6 for CT-6.