ML030720188

Ctr, Request for Additional Information for Relief Requests NDE-R001 (Revision 1) & NDE-R045 for Third 10-Year Interval of Inservice Inspection Program

ML030720188
Person / Time
Site:	Duane Arnold
Issue date:	03/14/2003
From:	Hood D NRC/NRR/DLPM/LPD3
To:	Peifer M Nuclear Management Co
References
TAC MB4800, TAC MB4803
Download: ML030720188 (5)

Text

March 14, 2003 Mr. Mark A. Peifer Site Vice President Duane Arnold Energy Center Nuclear Management Company, LLC 3277 DAEC Road Palo, IA 52324-0351

SUBJECT:

DUANE ARNOLD ENERGY CENTER - REQUEST FOR ADDITIONAL INFORMATION FOR RELIEF REQUESTS NDE-ROO1 AND NDE-R045 (TAC NO. MB4800 AND MB4803)

Dear Mr. Peifer:

By letter dated March 29, 2002, the Nuclear Management Company, LLC, forwarded four relief requests for the third 10-year interval of the Inservice Inspection (ISI) Program for Duane Arnold Energy Center and requested Nuclear Regulatory Commission (NRC) staff review and approval. The NRC staff finds that additional information, identified in the enclosure, is needed for two of the four relief requests (non-destructive examination (NDE)-R001, Revision 1, and NDE-R045).

A draft of the enclosure was discussed with Ms. C. Rushworth and others of your organization during a phone call on March 6, 2003. Following that call, we have expanded the request regarding NDE-R045 by adding requests 2 and 3 to the draft questions. Our subsequent discussion with Mr. S. Catron and Ms. Rushworth on March 12, 2003, indicates a mutually agreeable response date of 30 days from the date of this letter.

Should you have questions regarding the enclosure, or in the event you should be unable to meet the response date, please contact me by phone at 301-415-3049 or by email (dsh@nrc.gov).

Sincerely,

/RA/

Darl S. Hood, Senior Project Manager, Section 1 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-331

Enclosure:

Request for Additional Information cc w/encl: See next page

ML030720188 OFFICE PDIII-1/PM PDIII-1/LA EMCB/SC PDIII-1/SC NAME MPadovan for DHood THarris TChan LRaghavan DATE 03/13/03 03/13/03 03/13/03 03/14/03 Duane Arnold Energy Center cc:

John Paul Cowan Jonathan Rogoff, Esquire Chief Nuclear Officer General Counsel Nuclear Management Company, LLC Nuclear Management Company, LLC 27780 Blue Star Memrial Highway 700 Frist Street Cover, MI 49043 Hudson, WI 54016 Jeffrey S. Forbes Bruce Lacy Senior Vice President Nuclear Asset Manager Nuclear Management Company, LLC Alliant Energy/Interstate Power Monticello Nuclear Generating Plant and Light Company 2807 West Country Road 75 3277 DAEC Road Monticello, MN 55362-9637 Palo, IA 52324 John Bjorseth Daniel McGhee Plant Manager Utilities Division Duane Arnold Energy Center Iowa Department of Commerce 3277 DAEC Road Lucas Office Buildings, 5th floor Palo, IA 52324 Des Moines, IA 50319 Steven R. Catron Chairman, Linn County Manager, Regulatory Affairs Board of Supervisors Duane Arnold Energy Center 930 1st Street SW 3277 DAEC Road Cedar Rapids, IA 52404 Palo, IA 52324

REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUESTS NDE-R001 (REVISION 1) AND NDE-R045 DUANE ARNOLD ENERGY CENTER DOCKET NO. 50-331 By letter dated March 29, 2002, Nuclear Management Company, LLC (the licensee) forwarded four relief requests for the third 10-year interval of the Inservice Inspection (ISI) Program for Duane Arnold Energy Center and requested Nuclear Regulatory Commission (NRC) staff review and approval. The NRC staff finds that additional information is needed for two of the four relief requests:

Relief Request NDE-R001, Revision 1 (TAC No. MB4800)

1. Please provide the non-destructive examination (NDE) reports for reactor vessel welds VCB-B004, HMA-B002, and VCB-C005, complete with sketches showing the limitations regarding the extent of examination coverage. (The licensees letter of March 29, 2002, only provided data for one of the four reactor vessel welds, HCC-C001, for which relief is requested).

2. Is relief being requested in advance of performing the NDE on the three reactor vessel welds listed in item 1 above? This is different from the remainder of the relief requests where the examination is performed, reviewed against previous interval results and coverage calculated. If so, please provide sketches of the limitations on examination coverage and discuss the results found from testing of the welds during the second 10-year ISI Interval. Indicate whether any pattern of degradation was found and, if so, discuss this pattern. Also, identify the expected percentage of coverage.

3. What action will be taken if the amount of coverage for which relief is sought should not be obtained?

4. Page 3 of Attachment 1 to the licensees letter of March 29, 2002, states that HCC-C001 (the vessel head to flange weld) was examined as follows:

A third of this weld was examined during the RFO14 (1st period) with a weld coverage of 36.8 percent. The second third was examined during RF017 (2nd period) with a weld coverage of 70.54 percent. The third that was examined in RFO14 will be re-examined to obtain the 70.54 percent in the 3rd period.

This infers that the final third of HCC-C001 (with partial coverage) will not be examined and it will be replaced by re-examining a portion of the weld examined during the 1st period. Please explain the limitation that prevents partial coverage of this final third.

Relief Reguest NDE-R045 (TAC No. MB4803)

1. This relief request addresses scram discharge weld SDN-CF010. Please indicate whether the NDE results were compared with previous data on this weld and whether there was any change in the results.

2. Please explain why the required coverage cannot be achieved using a two-sided or one-sided full Vee examination.

3. In the Basis for Relief, you state that the adoption of Code Case N-460 permits a reduction in examination coverage of Class 1 welds...; however, your relief request pertains to Class 2 welds. Please address the applicability of your request relative to Class 2 welds.