ML102910709
| ML102910709 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 12/11/2009 |
| From: | Lake L NRC/RGN-II/DRS/EB3 |
| To: | Masters A NRC/RGN-II/DCP/CPB1 |
| References | |
| FOIA/PA-2010-0116 | |
| Download: ML102910709 (2) | |
Text
Masters, Anthony From:
Sent:
To:
Subject:
Attachments:
Categories:
Lake, Louis ýý Friday, December 11,2009 8:16 AM Masters, Anthony Emailing: !NRC Request #52 Information.docx
!NRC Request #52 Information.docx Perform Review Here is the latest response to Question #52 for your review.
Lou The message is ready to be sent with the following file or link attachments:
!NRC Request #52 Information.docx Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments. Check your e-mail security settings to determine how attachments are handled.
.1-.
K3
Request #52, NRC SIT Question Information
- 52. SP-182, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, Enclosure 5 is titled "Reduced Force Dome Tendons" and lists 18 tendons. What is meant by this term "reduced force"? When, how, and why did they become reduced? D 125 is shown on this list and is also listed as tested in the 3 rd Surveillance. Please Clarify.
Response to the above question:
Following the investigation and evaluation of the 1976 Dome delamination event the dome tendons were re-stressed to predetermined values, of which approximately every 8 th tendon was stressed at a value much, much lower than the remaining tendons (Approx. 646 KIPS vs. 1635 KIPS). These tendons are exempt from tendon lift-off, and wire removal testing.
During the random selection process if one of these exempt tendons (or in general a tendon that is inaccessible or due to interferences cannot be safely tested per the IWL code) happens to be selected for testing, then a substitute tendon located as close as possible to the exempt tendon gets selected for examination and testing. Although still classified as exempt, the original exempt tendon is still subject to the examination tendon anchorage, free water and corrosion protection medium examination requirements if possible.
A review of the 3 rd Surveillance tendon lift-off data shows that tendon D123 was tested. No test data was found for D125.