ENS 47580: Difference between revisions
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| facility = Pacific Gas & Electric Co. | | facility = Pacific Gas & Electric Co. | ||
| Organization = Diablo Canyon | | Organization = Diablo Canyon | ||
| license number = | | license number = SNM-2511 | ||
| region = 4 | | region = 4 | ||
| state = California | | state = California | ||
| Line 16: | Line 16: | ||
| event date = 01/09/2012 14:05 PST | | event date = 01/09/2012 14:05 PST | ||
| last update date = 02/29/2012 | | last update date = 02/29/2012 | ||
| title = Nut | | title = Nut on Hold-Down Stud Was Found Loose | ||
| event text = On January 9, 2012, at 1405 [PST], plant personnel notified the Diablo Canyon shift manager that a nut on a hold-down stud on an Independent Spent Fuel Storage Installation(ISFSI) HISTORM spent fuel storage cask was loose to the touch. Plant personnel hand tightened the nut and verified that none of the other 16 casks in the facility had nuts that were loose to the touch. | | event text = On January 9, 2012, at 1405 [PST], plant personnel notified the Diablo Canyon shift manager that a nut on a hold-down stud on an Independent Spent Fuel Storage Installation(ISFSI) HISTORM spent fuel storage cask was loose to the touch. Plant personnel hand tightened the nut and verified that none of the other 16 casks in the facility had nuts that were loose to the touch. | ||
The Diablo Canyon ISFSI design requires that each spent fuel storage cask be installed with the cask compressed against the embedment plate using 16, two-inch diameter, anchor studs. Each stud is pre-loaded to approximately 157,000 lbf. This design ensures the cask will remain stable during a seismic event. A manufacturer's analysis of the stability of the cask with all of the 16 hold down stud nuts installed with no pre-load concluded that the cask would maintain its stability during a seismic event. | The Diablo Canyon ISFSI design requires that each spent fuel storage cask be installed with the cask compressed against the embedment plate using 16, two-inch diameter, anchor studs. Each stud is pre-loaded to approximately 157,000 lbf. This design ensures the cask will remain stable during a seismic event. A manufacturer's analysis of the stability of the cask with all of the 16 hold down stud nuts installed with no pre-load concluded that the cask would maintain its stability during a seismic event. | ||
Latest revision as of 19:17, 24 November 2018
| Where | |
|---|---|
| Pacific Gas & Electric Co. Avila Beach, California (NRC Region 4) | |
| License number: | SNM-2511 |
| Organization: | Diablo Canyon |
| Reporting | |
| Information Only | |
| Time - Person (Reporting Time:+1.65 h0.0688 days <br />0.00982 weeks <br />0.00226 months <br />) | |
| Opened: | Michael Quitter 23:44 Jan 9, 2012 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Feb 29, 2012 |
| 47580 - NRC Website
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