ML110730569
| ML110730569 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/14/2011 |
| From: | Peter Bamford Plant Licensing Branch 1 |
| To: | Chernoff H Plant Licensing Branch 1 |
| Bamford, Peter J., NRR/DORL 415-2833 | |
| References | |
| TAC ME4882 | |
| Download: ML110730569 (3) | |
Text
March 14, 2011 MEMORANDUM TO: Harold K. Chernoff, Chief Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM:
Peter Bamford, Project Manager /ra/
Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
SUBJECT:
THREE MILE ISLAND, UNIT NO. 1 - ELECTRONIC TRANSMISSION, DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-10-01, CONTROL ROD DRIVE HOUSING EXAMINATIONS ASSOCIATED WITH THE THIRD INSERVICE INSPECTION INTERVAL (TAC NO. ME4882)
The attached draft request for additional information (RAI) was transmitted by electronic transmission on March 11, 2011, to Mr. Thomas Loomis, at Exelon Generation Company, LLC (Exelon, the licensee). This draft RAI was transmitted to facilitate the technical review being conducted by the Nuclear Regulatory Commission (NRC) staff and to support a conference call (if needed) with Exelon in order to clarify the licensees relief request regarding their proposal to conduct alternative examinations of welds on three non-peripheral control rod drive (CRD) housings in lieu of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code required examinations of certain peripheral CRD housings. The draft RAI is related to the licensees submittal dated October 13, 2010. The draft questions were sent to ensure that they were understandable, the regulatory basis was clear, and to determine if the information was previously docketed. Additionally, review of the draft RAI would allow Exelon to evaluate and agree upon a schedule to respond to the RAI. This memorandum and the attachment do not represent an NRC staff position.
Docket No. 50-289
Enclosure:
As stated
March 14, 2011 MEMORANDUM TO: Harold K. Chernoff, Chief Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM:
Peter Bamford, Project Manager /ra/
Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
SUBJECT:
THREE MILE ISLAND, UNIT NO. 1 - ELECTRONIC TRANSMISSION, DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-10-01, CONTROL ROD DRIVE HOUSING EXAMINATIONS ASSOCIATED WITH THE THIRD INSERVICE INSPECTION INTERVAL (TAC NO. ME4882)
The attached draft request for additional information (RAI) was transmitted by electronic transmission on March 11, 2011, to Mr. Thomas Loomis, at Exelon Generation Company, LLC (Exelon, the licensee). This draft RAI was transmitted to facilitate the technical review being conducted by the Nuclear Regulatory Commission (NRC) staff and to support a conference call (if needed) with Exelon in order to clarify the licensees relief request regarding their proposal to conduct alternative examinations of welds on three non-peripheral control rod drive (CRD) housings in lieu of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code required examinations of certain peripheral CRD housings. The draft RAI is related to the licensees submittal dated October 13, 2010. The draft questions were sent to ensure that they were understandable, the regulatory basis was clear, and to determine if the information was previously docketed. Additionally, review of the draft RAI would allow Exelon to evaluate and agree upon a schedule to respond to the RAI. This memorandum and the attachment do not represent an NRC staff position.
Docket No. 50-289
Enclosure:
As stated DISTRIBUTION:
Public RidsNrrPMThreeMileIsland Resource LPL1-2 R/F Accession No.: ML110730569
- via email OFFICE LPL1-2/PM CVIB/BC NAME PBamford MMitchell*
DATE 3/14/2011 03/09/2011 OFFICIAL RECORD COPY
DRAFT REQUEST FOR ADDITIONAL INFORMATION THREE MILE ISLAND NUCLEAR STATION, UNIT 1 RELIEF REQUEST CONCERNING CONTROL ROD DRIVE HOUSING EXAMINATIONS ASSOCIATED WITH THE THIRD INSERVICE INSPECTION INTERVAL RELIEF REQUEST RR-10-01 DOCKET NO. 50-289 By letter dated October 13, 2010 (Agencywide Documents Access and Management System Accession No. ML102870077), Exelon Generation Company, LLC submitted relief request RR-10-01 for Three Mile Island Nuclear Station, Unit 1 (TMI-1). TMI-1 is proposing to conduct alternative examinations of welds on three non-peripheral control rod drive (CRD) housings in lieu of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code required examinations of certain peripheral CRD housings. The U.S. Nuclear Regulatory Commission staff has been reviewing the submittal and has determined that additional information is needed to complete its review.
- 1.
Regarding page 2 of the relief request, paragraph 2, provide the specific type(s) of examination(s), i.e., visual (VT-2), dye penetrant (PT), magnetic particle (MT), ultrasonic (UT), etc., referred to in the statement six (6) CRDs not in the periphery were examined
- 2.
Regarding page 2 of the relief request, paragraph 2, provide the specific type(s) of examination(s), i.e., VT-2, PT, MT, UT etc., referred to in the statement, A review of lSI
[inservice inspection] data for examinations of welds A, B, and C completed since 1986 identified no degradation.
- 3.
Regarding page 2 of the relief request, paragraph 2, the second sentence states, There were no examination limitations reported for these welds. Please clarify this statement.
Does it refer to the accessibility of the welds for examination or that there were no defects in the welds?