ML101260130
| ML101260130 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 05/05/2010 |
| From: | Nicholas Difrancesco Plant Licensing Branch III |
| To: | Hansen J, Mathews M Exelon Corp |
| DiFrancesco N, NRR/DORL/LPL3-2, 415-1115 | |
| References | |
| TAC ME2987, TAC ME2988, TAC ME2990, TAC ME2991 | |
| Download: ML101260130 (2) | |
Text
From:
DiFrancesco, Nicholas Sent:
Wednesday, May 05, 2010 1:55 PM To:
Mitchel.Mathews@exeloncorp.com; jeff.hansen@exeloncorp.com
Subject:
Draft NRC RAI Re: Clinton Power Station, Unit No. 1 - Relief Requests - I3R-01
- I3R-05 (Tac Nos. ME2987,ME2988,ME2989,ME2990 and ME2991)
Mr. Mathews, By letter dated December 30, 2009 (Agencywide Documents and Management System (ADAMS) Accession No. ML093650139), Exelon Generation Company, LLC (EGC), the licensee for the Clinton Power Station (CPS), Unit No. 1, submitted relief requests (RR) I3R-01 through I3R-05.
The Piping and NDE Branch and Probabilistic Risk Assessment Licensing Branch have reviewed the information provided and determined that in order to complete its evaluation, additional information may be required. The draft RAI related to the staff review is provided below.
After reviewing the draft RAI, please contact me at 301-415-1115 to discuss the need for a teleconference concerning the RAIs and to discuss a due date for the response.
Respectfully, Nick DiFrancesco Project Manager Nuclear Regulatory Commission Division of Operating Reactor Licensing nicholas.difrancesco@nrc.gov Tel: (301) 415-1115 Fax: (301) 415-1222
-DRAFT-REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUEST I3R-01 and I3R-05 CLINTON POWER STATION (CPS)
EXELON GENERATION COMPANY, LLC DOCKET NO.: 50-461 By letter dated December 30, 2009, Exelon Generation Company, LLC submitted for staff review and approval ISI Program Relief Request I3R-01, which requests an alternative risk-informed inservice inspection (RI-ISI) selection and examination criteria for Category B-F,
B-J, C-F-1 and C-F-2 pressure retaining piping welds for CPS. To complete its review, the staff requests the following additional information.
- 1. Do the following CPS augmented inspection programs remain unaffected by the RI-ISI program for the third 10-year inservice inspection interval?
Service Water Integrity Program (Generic Letter 89-13)
Flow Accelerated Corrosion (FAC) (Generic Letter 89-08)
High Energy Line Breaks (USNRC Branch Technical Position MEB 3-1)
- 2. Are the inspection locations in the RI-ISI program that have been developed for the third 10-year interval the same locations as those in the program approved in the NRC staff's April 8, 2002, safety evaluation? If not, please summarize the changes to the program and what caused those changes.
- 3. If there are changes in the inspection locations for the CPS third 10-year interval RI-ISI program please provide information for the third interval program regarding:
examinations/system/components/degradation mechanisms/class, etc. similar to that provided in Tables 1, 2, 3, 4 and 5 of the original submittal of the RI-ISI program for the CPS second 10-year inservice inspection interval dated October 15, 2001.
- 4. On p. 2 of Enclosure 1 to Attachment 1 to the application, a current industry peer review of the Clinton PRA is identified as scheduled for the fourth quarter of 2009. State whether the results of this industry peer review are available. If the results are available, identify any new findings that are not already listed in Table 1: Impact of Open Significant PRA Peer Review Findings for the Clinton PRA Model. Provide an impact assessment of any new findings.
By letter dated December 30, 2009, Exelon Generation Company, LLC submitted for staff review and approval ISI Program Relief Request I3R-05, which requests relief from the requirement to perform surface examinations of Category C-G pump casing welds required by American Society of Mechanical Engineers Boiler and Pressure Vessel Code,Section XI, Table IWC-2500-1, Category C-G Item C6.10 for CPS. To complete its review, the staff requests the following additional information.
- 1. Please provide component drawings of the Class 2 High Pressure Core Spray, Low Pressure Core Spray and Residual Heat Removal Pumps which identify the pump casing welds subject to the surface examination requirement of Table IWC-2500-1, Category C-G.
- 2. Please identify the start date and currently scheduled end date for the third 10-year inservice inspection interval at CPS.
-DRAFT-