ML110730586
| ML110730586 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/16/2011 |
| From: | Peter Bamford Plant Licensing Branch 1 |
| To: | Pacilio M Exelon Nuclear |
| Bamford, Peter J., NRR/DORL 415-2833 | |
| References | |
| TAC ME4882 | |
| Download: ML110730586 (3) | |
Text
\\,.~,..p. REGlIJ _
UNITED STATES vV
""'f;.
..iii!'
"0",...
NUCLEAR REGULATORY COMMISSION t!
(")
WASHINGTON. D.C. 20555-0001
<f 0
\\i;
,I :
~
~
~
~
"1
...0 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville. IL 60555 March 16, 2011
SUBJECT:
THREE MILE ISLAND NUCLEAR STATION. UNIT 1 - 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)
Dear Mr. Pacilio:
By letter dated October 13, 2010 (Agencywide Documents Access and Management System Accession No. ML102870077). Exelon Generation Company. LLC (Exelon, the licensee) submitted a relief request 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 Nuclear Regulatory Commission staff has been reviewing the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAI). The questions were sent via electronic transmission on March 11. 2011. to Mr. Thomas Loomis, of your staff. The draft questions were sent to ensure that the questions were understandable. the regulatory basis for the questions was clear, and to determine if the information was previously docketed. The draft questions were discussed in a teleconference with your staff on March 16, 2011. It was agreed that a response to this RAI would be submitted by April 18, 2011.
Please contact me at 301-415-2833. if you have any questions.
Sincerely, Peter Bamford, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-289
Enclosure:
As stated cc w/encl: Distribution via Listserv
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?
Enclosure
March 16,2011 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
THREE MILE ISLAND NUCLEAR STATION, UNIT 1 - 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)
Dear Mr. Pacilio:
By letter dated October 13, 2010 (Agencywide Documents Access and Management System Accession No. ML102870077), Exelon Generation Company, LLC (Exelon, the licensee) submitted a relief request 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 Nuclear Regulatory Commission staff has been reviewing the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAI). The questions were sent via electronic transmission on March 11, 2011, to Mr. Thomas Loomis, of your staff. The draft questions were sent to ensure that the questions were understandable, the regulatory basis for the questions was clear, and to determine if the information was previously docketed. The draft questions were discussed in a teleconference with your staff on March 16,2011. It was agreed that a response to this RAI would be submitted by April 18, 2011.
Please contact me at 301-415-2833, if you have any questions.
Sincerely, IRA!
Peter Bamford, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-289
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
RidsNrrPMThreeMilelsland Resource PUBLIC LPLI-2 R/F RidsAcrsAcnw_MailCTR Resource RidsNrrLAABaxter Resource RidsOgcRp Resource RidsRgn1 MailCenter Resource RidsNrrDortDpr Resource RidsNrrDorlLpl1-2 Resouce EAndruszkiewicz, NRR RidsNrrDciCvib Resource ADAMS Accession Number' ML110730586
- via email OFFICE LPL1-21PM LPL1-2/LA DCI/CVIB/BC LPLI-2/BC NAME PBamford ABaxter (SUttle for)
MMitchell*
HChernoff
! DATE 6/11 3/16/11 03/09/2011 3116111 OFFICIAL RECORD COPY