RA06-062, In Service Inspection Intervals
| ML062720153 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 09/22/2006 |
| From: | Landahl S Exelon Generation Co, Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA06-062 | |
| Download: ML062720153 (4) | |
Text
Exeluan Exelon Generation Company, LLC www.exeloncorp.com NEUxeeIa-LaSalle County Station 2601 North 21"Road Marseilles, IL 61341-9757 RA06-062 September 22, 2006 10 CFR 50.55a(g)
U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-1 1 and NPF-1 8 NRC Docket Nos. 50-373 & 50-374
Subject:
In Service Inspection (ISI) Intervals The purpose of this letter is to inform the NRC that Exelon Generation Company, LLC (EGC) intends to synchronize the Ten-Year In Service Inspection (ISI) intervals between LaSalle County Station (LSCS) Units 1 and 2 for American Society of Mechanical Engineers (ASME) Code Classes 1, 2 and 3 and to align the Ten-Year Containment ISI (CISI) interval for ASME Code Classes MC (Metallic Containment) and CC (Concrete Containment) with the synchronized Units 1 and 2 Ten-Year ISI interval.
The LSCS Unit 1 second ISI interval is scheduled to end on October 11, 2006. The LSCS Unit 2 second ISI interval will end on July 4, 2007. The LSCS CISI first interval will end on September 9, 2008 for both Units 1 and 2.
To effect the synchronization and alignment between the Unit 1 and Unit 2 ISI and CISI intervals, the following will be implemented based on the provisions of ASME Section XA paragraph IWA-2430 "Inspection Intervals." In accordance with "Program B" of sub-paragraph IWA-2430(d), each inspection interval may be reduced or extended up to one year. The details of the reductions and extensions planned for LSCS Units 1 and 2 are provided in the attachment.
Since the provisions of ASME Section XA paragraph IWA-2430(d) are met, a relief request in accordance with 10 CFR 50.55a, "Codes and standards," paragraph (a)(3)(i) is not required and therefore this letter is provided for information only.
September 22, 2006 U.S. Nuclear Regulatory Commission Page 2 Should you have any questions concerning this submittal, please contact Mr. Terrence W. Simpkin, Regulatory Assurance Manager, at (815) 415-2800.
Respectfully, Susan R. Landahl Site Vice President LaSalle County Station Attachment cc:
Regional Administrator - NRC Region III NRC Senior Resident Inspector - LaSalle County Station
Attachment ISI Inspection Intervals The LaSalle County Station (LSCS), Unit 1 second In-Service Inspection (ISI) interval is scheduled to end on October 11, 2006 and the same LSCS, Unit 2 interval will end on July 4, 2007. The LSCS Units 1 and 2 Containment ISI (CISI) first Interval will end on September 9, 2008.
The purpose of this letter is to inform the NRC that Exelon Generation Company, LLC (EGC) intends to synchronize the Ten-Year In-Service Inspection (1SI) intervals between LaSalle County Station (LSCS) Units 1 and 2 for American Society of Mechanical Engineers (ASME) Code Classes 1, 2 and 3 and to align the Ten-Year Containment ISI (CISI) interval for ASME Code Classes MC (Metallic Containment) and CC (Concrete Containment) with the synchronized Units 1 and 2 Ten-Year ISI Interval.
These changes will assure that both the ISI and CISI Programs use the same Code Edition and Addenda for the next and successive intervals and will likewise establish common implementing procedures for both LSCS units. In addition, the next (i.e., second interval) CISI Program interval for both Units I and 2 will be aligned with the start of new (i.e., third interval) ISI Program interval. This synchronization and alignment will permit the subsequent ISI and CISI Programs to share common inspection intervals and implement common Code Editions for ASME Code Classes 1, 2, 3, MC, and CC components. The common code of record for the third interval ISI programs and second interval CISI programs will be the 2001 Edition through the 2003 Addenda of ASME Section XI.
To effect the synchronization and alignment between the Unit 1 and Unit 2 ISI and CISI intervals, the following will be implemented based on the provisions of ASME Section XI paragraph IWA-2430, "Inspection Intervals." In accordance with "Program B" of sub-paragraph IWA-2430(d), each inspection interval may be reduced or extended up to one year, however, adjustments shall not cause successive intervals to be altered by more than one year from the original pattern of intervals.
As a result of these extensions or reductions of the current ISI and CISI intervals as shown in Table 1, the date to start both Unit 1 and Unit 2 ISI Third Interval and the Unit 1 and Unit 2 CISI Second Interval will be on October 1, 2007. The extensions or reductions are all within the required maximum of one year in accordance with IWA-2430(d).
Table 1 - Extension or Reduction of Current ISI and CISI Intervals Unit No.
Program Inclusive Dates Days Days
__ Extended Reduced Unit 1 ISI Oct 11, 2006 to Sept 30,2007 354 Days Unit 2 ISI July 4, 2007 to Sept 30, 2007 t
88 Days Unit 1 CISI Sept 9, 2008 to Sept 30, 2007 345 Days Unit 2 CISI Sept 9, 2008 to Sept 30, 2007 345 Days The remaining required inspections for the current ISI Second interval'and the CISI First Interval will be implemented during the dates/outages stated below. 'These examinations will be conducted and credited under the rules of the existing codes of record (i.e., 1989 Edition, No Addenda (ISI), and the 1998 Edition, No Addenda (CISI)):
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Attachment ISI Inspection Intervals
- 2. Second Interval, Third Period, Unit 2 ISl Inspection = L2R11 (2/07)
- 3. First Interval, Third Period Unit 1, CISI (IWE) Inspection = L1R12 (2/08)
- 4. First Interval, Third Period Unit 2, CISI (IWE) Inspection = L2R1 1 (2/07)
The successive ISI and CISI Inspections for the new intervals will be performed as shown in Tables 2, 3, and 4.
Table 2 - First Period of the Synchronized and Aliqned ISI and CISI Intervals (October 1. 2007 to September 30. 2010)
Unit Program Interval and Period Outage and Date No.
Unit 1 ISI Third Interval, First Period L1 R12 (2/08) and L1 R13 (2/10)
Unit 2 ISI Third Interval, First Period L21R12 (3/09)
Unit 1 ClSl Second Interval, First Period L1R13 (2/10)
Unit 2 CISI Second Interval, First Period L2R12 (3/09)
Table 3 - Second Period of the Synchronized and Aligned ISI and CISI Intervals (October 1, 2010 to September 30,. 2014)
Unit Program Interval and Period Outage and Date No.
Unit 1 ISI Third Interval, Second Period L1 R14 (2/12) and L1 RI5 (2114)
Unit 2 ISI Third Interval, Second Period 1_2R13 (3/11) and L2R14 (3/13)
Unit 1 CISI Second Interval, Second Period LIRi4 (2/12) and LIR15 (2/14)
Unit 2 CISI Second Interval, Second Period L2R13 (3/11) and L2RI4 (3/13)
Table 4-Third Period of the Synchronized and Aligned ISI and CISI Intervals (October 1. 2014 to September 30, 2017)
Unit Program Interval and Period Outage and Date No.
Unit 1 ISI Third Interval, Third Period L1R16 (2/16)
Unit 2 ISI Third Interval, Third Period L2R15 (3/15) and L2R16 (3/17)
Unit 1 1CSI Second Interval, Third Period Li R1 6 (2/16)
Unit 2 CISI Second Interval, Third Period L2R15 (3/15) and L2R16 (3/17)
For the rolling five-year IWL frequency applicable to Class CC components that are subject to Subsection IWL requirements, the current schedule will be maintained, and the inspection will be conducted in accordance with the ASME code of record for LSCS at the time of examination.
Since the provisions of ASME Section Xl paragraph IWA-2430(d) has been adhered to as required, a relief request under the provision of IOCFR50.55a(a)(3)(i) is not required.
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