ML13267A185
| ML13267A185 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun, 07109168  |
| Issue date: | 09/23/2013 |
| From: | Cortopassi L Omaha Public Power District |
| To: | Document Control Desk, NRC/NMSS/SFST |
| References | |
| LlC-13-0128 | |
| Download: ML13267A185 (8) | |
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Djljljj IJmBIIa PubIk: 1'08' IJirIIff;t 444 South 16th Street Mall Omaha, NE 68102-2247 LlC-13-0128 September 23,2013 A TIN: Document Control Desk Director, Division of Spent Fuel Storage and Transportation, Office of Nuclear Material Safety and Safeguards, U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
Reference:
Letter from D. B. Shrum (EnergySolutions) to M. Lombard (U. S. NRC),
"10 CFR 71.95 Report on the 8-120B Cask," dated August 14, 2013 (Accession Number ML13247A179)
Subject:
Report In Accordance With 10 CFR 71.95 Related to the Pressure Drop Testing of the EnergySolutions 8-1208 Shipping Cask In accordance with 10 CFR 71.95, "Reports," Omaha Public Power District (OPPD) is submitting the attached report pursuant to 10 CFR 71.95(a)(3) regarding potential instances in which the conditions of approval in Certificate of Compliance (Co C) #9168 for the EnergySolutions Model 8-120B shipping cask, may not have been observed when making shipments. This report is based on OPPD's discovery of the potential condition on August 14, 2013, as discussed in the referenced letter. This cask has not been in use at the OPPD Fort Calhoun Station since 2006.
The potential condition involves a discrepancy in the vent port seal air pressure drop test hold time between EnergySolutions Test Procedure TR-TP-002 and the Safety Analysis Report (SAR) for the 8-120B shipping cask (i.e., a 20 minute hold time in accordance with the test procedure, versus the 60 minutes required by the SAR supporting the CoC).
The referenced notification was developed by the certificate holder, but it is applicable to the use of the 8-120B shipping cask at Fort Calhoun Nuclear Station. Since the discrepancy between the EnergySolutions Air Pressure Drop Test Procedure, TR-TP-002, and the 8-120B SAR has existed since February 2001, OPPD cannot rule out the possibility that shipments may have occurred where the subject vent port seal was opened and a 20-minute leak test was performed in accordance with TR-TP-002 in lieu of the 60-minute test required by the 8-120B SAR.
Employment with Equal Opportunity
U. S. Nuclear Regulatory Commission LlC-13-0128 Page 2 OPPD has made four shipments using the 8-120B shipping cask.
Shipment Number Date Volume (ft3)
Chemical and Physical Form FCS-RW-04-02 2/19/2004 120 Metal Oxide, Solid FCS-RW-Q5-39 5/2/2005 120 Metal Oxide, Solid FCS-RW-06-12 4/26/2006 120 Metal Oxide, Solid FCS-RW-Q6-24 8/23/2006 120 Metal Oxide, Solid Contents Primary Resin Primary Resin Primary Resin Primary Resin All future OPPD shipments will be made using new cask lids, which were deployed for use by EnergySolutions on September 1, 2013. Test procedures for future shipments will be consistent with the test requirements for the new lids.
There are no new regulatory commitments contained in this submittal. If you should have any questions, please contact Terrence W. Simpkin, Manager, Site Regulatory Assurance, at (402) 533-6263.
Sincerely, Louis P. Cortopassi Site Vice President and CNO LPC/rjr
Attachment:
Letter from D. B. Shrum (EnergySolutions) to M. Lombard (U. S. NRC),
"10 CFR 71.95 Report on the 8-120B Cask," dated August 14, 2013 c:
S. A. Reynolds, Acting NRC Regional Administrator, Region IV J. M. Sebrosky, NRC Project Manager L. E. Wilkins, NRC Project Manager J. C. Kirkland, NRC Senior Resident Inspector
LlC-13-0128 Attachment Page 1 Attachment Letter from D. B. Shrum (EnergySolutions) to M. Lombard (U. S. NRC),
"10 CFR 71.95 Report on the 8-1208 Cask," dated August 14, 2013
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==========ENERGYSOLUTIONS==========
August 14, 2013 Mark Lombard, Director Division of Spent Fuel Storage and Transportation Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Washington DC 20555-0001 ATTN: Document Control Desk
Subject:
10 CFR 71.95 Report on the 8-120B Cask
Dear Mr. Lombard:
CD 13-0232 EnergySolutions hereby submits the attached report providing the information required by 10 CFR 71.95( a)(3) for instances in which the conditions of approval in the Certificate of Compliance for the 8-120B Cask (Certificate of Compliance #9168) may not have been observed in making certain shipments. The circumstances described in this report are applicable to all licensed users of the cask.
If you have any questions regarding this submittal, please contact me at 801-649-2109.
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Daniel B. Shrum Senior Vice President, Regulatory Affairs EnergySolutions
Attachment:
Failure to Observe Certificate of Compliance Conditions for the 8-120B Vent Port Leak Test Hold Time cc: Michele Sampson, Chief Thermal and Containment Branch Pierre M. Saverot Licensing Branch 423 Wesl300 South, Suite 200* Salt lake City, UT 84101 www.energysolutions.com
- 1) Abstract
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ENERGYSOLUTION.S' Failure to Observe Certificate of Compliance Conditions for the 8-120B Vent Port Leak Test Hold Time August 14, 2013 This report provides the infonnation required by 10 CFR 71.95(a)(3) for instances in which the conditions of approval in the Certificate of Compliance for the 8-120B Cask (Certificate of Compliance #9168) may not have been observed in making certain shipments. The circumstances described in this report are applicable to all licensed users of the cask.
EnergySolutions' air pressure drop test procedure TR-TP-002 describes a 20-minute hold time for the pre-shipment leak test of the cask vent port. The 8-120B Safety Analysis Report (SAR), however, specifies a hold time of 60 minutes for the leak test ofthe vent port; therefore the conditions of approval in the Certificate of Compliance may not necessarily have been observed in making shipments. TR-TP-002 is the basis for leak tests on an EnergySo!utions shipments, as wen as the suggested procedure content for most shipments by our authorized users. I The 8-120B CoC requires the package to be prepared for shipment and operated in accordance with Chapter 7 of the SAR, and tested and maintained in accordance with Chapter 8 of the SAR. TR-TP-002 captures the applicable SAR requirements and provides further detail for the development of a shipper's operating procedure. Recently, an 8-120B cask user identified the hold time discrepancy between TR-TP-002 and the SAR (i.e., 20 versus 60 minutes). Based on a review of past revisions ofCoCs, SARs, and cask handling procedures, it appears that this discrepancy has existed for approximately 12 years, spanning approximately 88 cask users and approximately 1,400 shipments.
Upon notification and after confinnation of the discrepancy, EnergySolutiol1S revised TR-TP-002 to incorporate the SAR required 60-minute vent port leak test. This change to TR-TP-002 was communicated to an EnergySolutions registered cask users on June 13, 2013. The SAR requires pre-shipment leak testing of the vent port only when the port has been opened since the preceding vent port leak test. EnergySolutions issued a notice to registered cask users on July 2, 2013 to clarify this issue. Operation of a package vent port is infrequent. However some vent ports may have been opened during the past 12 years; and therefore the pre-shipment leak testing would have been required.
The licensing basis for the pre-shipment leak tests for all three of the 8-120B lid containment seals is a pressure drop calculation for.the largest of the three seals (the primary lid seal).
The required hold time is therefore conservative for the two seals with smaller test volumes.
Because of the small size of the vent port seal test volume, EnergySolutions has detennined that the 20-minute hold time meets the same criterion by which the 60-minute hold time was derived for the larger primary lid seal. In fact, in the case of the vent port leak test, the 20-minute hold time provides substantial margin for detecting any leakage from the vent port. It therefore follows that there is no safety significance associated with the condition.
1 Since registered users of the 8-120B package are licensees, these licensees would normally prepare and issue an approved procedure to control their pre-shipment activities.
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ENERGYSOLUTIONS Furthennore, there is no continuing safety concern as new lids are required to be used after August 31, 2013 with different testing procedures.
Due to the long timeframe over which this condition has existed, the large number of 8-120B cask users, the many shipments that have occurred, the difficulty of detennining which if any shipments may have been out of compliance, and the finding of no significant safety impact, EnergySolutions hereby submits this notification to summarize the issue as it applies to all 8-120B users. Because of the imminent ronout of new lids and related test procedures, no further corrective actions by certificate users are necessary to address this leak test procedure.
- 2) Narrative Description of the Event a) Status of Components All 8-120B components are operating normally.
b) Dates of Occurrences February 2001 to prese~t.
c) Cause of Error Discrepancy between EnergySolutions air pressure drop test procedure TR-TP-002 and Chapter 8 of the 8-120B SAR.
d) Failure Mode, Mechanism, and Effects Not applicable; no 8-I 20B packaging components have failed.
e) Systems or Secondary Functions Affected Not applicable.
f) Method of Discovery of the Error The condition was identified by an 8-120B cask user.
- 3) Assessment of Safety Consequences There is ito safety consequence of performing the pre-shipment leak test of the 8-120B cask vent port using a 20-minute hold time versus the 60-minute hold time that is required by the 8-120B CoCo The required hold time varies in proportion to the test volume if the test pressure and acceptance criterion remain unchanged. Larger test volumes require longer hold times. The test volume includes the free volume of the space to be tested and the volume of the test manifold. For the original subject 8-120B lids, Section 4.4 of the July 2012 SAR Addendum shows the calculation basis for a 60-minute hold time. Only one calculation was presented for the large primary lid containment seal. Since the other seals have smaller test volumes, a 60-minute hold time was conservatively specified for all seals, including the vent port.
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ENERG\\'SOLUTIONS The SAR test volume for the primary containment seal was 103.2 cc. For the pre-shipment vent port leak test, there is no safety impact from a 20-minute hold time provided that the test volume is less than or equal to the 20/60 times the primary containment seal test chamber volume, or (20/60)*103.2 = 34.4 cc. The vent port test volume is equal to the combined volume of the test manifold (10 cc) plus a very small residual volume inside the vent port, which is less than 34.4 cc. Therefore, pre-shipment leak tests of the vent port performed using a 20-minute hold time are adequate to demonstrate compliance with maximum leak rate acceptance criteria, and there is no safety consequence from testing vent ports for 20 minutes instead of 60 minutes.
- 4) Planned Corrective Actions As noted above, upon notification and after confirmation of the discrepancy, EnergySolutions revised TR-TP-002 to incorporate the SAR required 60-minute vent port leak test and notified registered cask users of the change.
Beginning September 1, 2013, the 8-120B fleet will ship with a new lid design, authorized in the latest revision ofthe CoC? Thereafter, the 8-120B cask may no longer be used with the old seals that were authorized in Revision No. 17 of the 8-120B CoCo Shipments with the new lids will be required to use the seals authorized in Revision 19 of the Coc. The EnergySofutions air pressure drop test procedure TR-TP-002 is being revised and reissued based on the requirements of Revision 19 of the 8-120B Coc. These revisions are reviewed and approved by the EnergySolutions Cask Licensing Manager to assure that they are compliant with the requirements of the Coc.
EnergySolutions also has initiated a lifecycle procedure for managing Type B casks to assure that CoC requirements flow through the design, fabrication, and operational phases. This is a new procedure that also would identify existing inconsistencies and prevent future inconsistencies between the SAR and operating procedures. The procedure will be effective August 19,2013.
The error in incorporating the revised 60-minute vent port leak rate criteria into TR-TP-002 raises a question as to whether there are other similar errors involving the flow-down of requirements into operating procedures. Accordingly, EnergySolutions plans to conduct a review of the 8-120B and other EnergySo!utions Type B packagings to verify that CoC and SAR requirements have been accurately translated into the prescribed operating procedures.
If any such discrepancies are found, EnergySolutions will expand the scope of these reviews as necessary,
- 5) Previous Similar Events Involving the 8-120B No previous similar events have been identified.
2 No shipments have been made using the new lids to date.
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ENERGVSOLUTIONS
- 6) Contact for Additional Information Dan Shrum EnergySolutions Senior Vice President, Regulatory Affairs (801) 649-2109
- 7) Extent of Exposure of Individuals to Radiation or Radioactive Materials None.