ML18292A523

Letter to K. Manzione Acceptance Review of Request for Amendment No. 13 to Certificate of Compliance No. 1014 for the HI-STORM 100 Multipurpose Canister Storage System - Request for Supplemental Information (W/Enclosure)

ML18292A523
Person / Time
Site:	Holtec
Issue date:	10/19/2018
From:	Lingam S P Spent Fuel Licensing Branch
To:	Manzione K Holtec
Lingam S P
References
EPID L-2018-LLA-0202
Download: ML18292A523 (9)

Text

Code of Federal Regulations

"Your technical justification for continued use of the loaded cask systems evaluated the thermal and radiological performance of the casks and concluded that the casks would continue to meet all of their required functions. The justification relied upon an assumed leakage rate from the casks, and utilized a dose assessment methodology that credited gravitational settling to reduce calculated release estimates. The NRC does not have any data to confirm the acceptability of your assumed cask leakage rates, and has not previously reviewed or endorsed the methodology used in your response for calculating the site dose rates attributed to postulated leakage from the casks. The NRC concluded that while your response provides supplemental information to support the continued safe operation of the casks, additional site specific information is needed to ensure that the loaded casks will continue to meet all regulatory requirements."

"Casks previously loaded to Amendment 7 and all prior amendments are exempt from this requirement and must meet the requirements of the amendment to which they were loaded."

"Casks previously loaded to Amendment 7 and all prior amendments are exempt from this requirement and must meet the requirements of the amendment to which they were loaded." "Casks loaded prior to July 1, 2009, to Amendment Nos. 2 through 7 are grandfathered and therefore not required to comply with the above helium leak test requirements. Casks fabricated and loaded after July 1, 2009, must comply with the above helium leak test requirement."

"Leakage testing has been reinstated at the manufacturing facility for all MPCs currently being fabricated or in storage. Leakage tested on newly fabricated MPCs was reinstated on July 1, 2009."

"Written cask acceptance tests and maintenance program shall be prepared consistent with the technical basis described in Chapter 9 of the FSAR."

"This issue is considered to be of greater than minor significance since approximately 120 MPCs were loaded without being adequately tested to demonstrate their leaktightness." "[-] 107 MPCs were manufactured and loaded without fabrication leakage testing being performed."

Text

Code of Federal Regulations

"Your technical justification for continued use of the loaded cask systems evaluated the thermal and radiological performance of the casks and concluded that the casks would continue to meet all of their required functions. The justification relied upon an assumed leakage rate from the casks, and utilized a dose assessment methodology that credited gravitational settling to reduce calculated release estimates. The NRC does not have any data to confirm the acceptability of your assumed cask leakage rates, and has not previously reviewed or endorsed the methodology used in your response for calculating the site dose rates attributed to postulated leakage from the casks. The NRC concluded that while your response provides supplemental information to support the continued safe operation of the casks, additional site specific information is needed to ensure that the loaded casks will continue to meet all regulatory requirements."

"Casks previously loaded to Amendment 7 and all prior amendments are exempt from this requirement and must meet the requirements of the amendment to which they were loaded."

"Casks previously loaded to Amendment 7 and all prior amendments are exempt from this requirement and must meet the requirements of the amendment to which they were loaded." "Casks loaded prior to July 1, 2009, to Amendment Nos. 2 through 7 are grandfathered and therefore not required to comply with the above helium leak test requirements. Casks fabricated and loaded after July 1, 2009, must comply with the above helium leak test requirement."

"Leakage testing has been reinstated at the manufacturing facility for all MPCs currently being fabricated or in storage. Leakage tested on newly fabricated MPCs was reinstated on July 1, 2009."

"Written cask acceptance tests and maintenance program shall be prepared consistent with the technical basis described in Chapter 9 of the FSAR."

"This issue is considered to be of greater than minor significance since approximately 120 MPCs were loaded without being adequately tested to demonstrate their leaktightness." "[-] 107 MPCs were manufactured and loaded without fabrication leakage testing being performed."