05000335/FIN-2011005-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Reactor Pressure Vessel supports not included in the St. Lucie ISI Program |
| Description | The inspectors identified an unresolved item related to the Reactor Pressure Vessel (RPV) component supports, for which additional information is needed. The information will be used to determine if the performance deficiency that has been identified is more than minor. The inspectors identified that the scope of the St. Lucie, Unit 1 In-Service Inspection (ISI) Program did not meet the requirements of 10 CFR 50.55a, which requires that in-service inspections be conducted in accordance with the requirements of ASME Code,Section XI, Rules for In-service Inspection of Nuclear Power Plant Components. The inspectors identified that the nuclear Class 1 reactor pressure vessel supports were not included in the scope of the St Lucie Unit 1 ISI Program for the fourth interval. The ISI program was prepared in accordance with the 2001 Edition of the ASME Section XI Code, with addenda through 2003, as modified by 10 CFR 50.55a. In accordance with the requirements of Article IWF1000, Table IWF-2500-1, Examination Category, Item Number F1.40, Support Other than Piping Supports, Class 1, 2, 3 and MC, the RPV supports are required to be visually examined per the requirements of the VT-3 examination. The St. Lucie Reactor Pressure Vessel (RPV) is supported by three supports that are made up of an integrally attached lug and other support components. The function of the support assembly is to provide support to the reactor vessel and attached piping and to allow for thermal movement of the piping during normal and accident conditions. Periodic examinations are required to provide reasonable assurance that these supports can continue to perform their intended function. The licensee initially indicated that they have documentation that indicated it was acceptable to not include these supports in their ISI program. Subsequently the licensee determined that these supports are subject to the examinations requirements of the ASME Section XI Code and should have been included in the ISI program scope. The licensee entered this issue into their CAP with AR 176657. Currently the licensee has identified a partial disposition of AR 176657 which includes: Revise design drawings to clearly include equipment ID numbers and locations of RPV supports. Update the ISI Program to include the RPV supports and create component ID numbers. Schedule the RPV supports for examination prior to startup during the current refueling outage. Update ISI isometric drawings to reflect the component ID numbers and locations of the RPV supports. The visual (VT-3) inspections of the RPV supports are scheduled to be conducted prior to the completion of the current refueling outage. Unit 1 is currently in an extended shutdown for Power Uprate modifications and the outage is scheduled to be completed in March 2012. Further evaluation of this issue will be performed upon completion of the following licensees corrective actions: Licensees evaluation of the results of the RPV support examinations conducted during this outage Update the ISI Program to include the RPV supports and create component ID numbers Revise design drawings to clearly include equipment ID numbers and locations of RPV supports Update ISI isometric drawings to reflect the component ID numbers and locations of the RPV supports This issue requires further review and additional information from the licensee to complete its disposition in accordance with IMC-0609. Therefore, this issue will be tracked as an unresolved item. |
| Site: | Saint Lucie  |
|---|---|
| Report | IR 05000335/2011005 Section 1R08 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.08 |
| Inspectors (proximate) | L Lake T Hoeg B Caballero D Rich M Coursey N Childs A Butcavage R Reyes |
| INPO aspect | |
| ' | |
Finding - Saint Lucie - IR 05000335/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Saint Lucie) @ 2011Q4
Self-Identified List (Saint Lucie)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||