ML023120447

RAI: Hatch Relief Request RR-34, Revision 1, and RR-37

ML023120447
Person / Time
Site:	Hatch
Issue date:	11/08/2002
From:	Joseph Colaccino NRC/NRR/DLPM/LPD2
To:	Luker I Southern Nuclear Operating Co
Colaccino J, NRR/DLPM, 415-2753
References
TAC MB5009, TAC MB5010
Download: ML023120447 (3)

Text

From: Joseph Colaccino To: INTERNet:ifluker@southernco.com Date: 11/8/02 10:32AM

Subject:

RAI: Hatch Relief Request RR-34, Revision 1, and RR-37 Ira Luker, Attached is the staffs request for additional information on Hatch Relief Requests RR-34, Revision 1, and RR-37, submitted to the NRC in a letter dated May 3, 2002. The questions concern the proposed alternatives to use enhanced visual testing examinations in lieu of the ASME Section XI Code-required ultrasonic testing examinations of the reactor pressure vessel inner nozzle radius sections.

Please let me know if you have any questions.

Joe Colaccino, NRC Hatch Project Manager 301-415-2753 CC: Donald Naujock; John Nakoski

November 8, 2002 Request for Additional Information Hatch Relief Request RR-34, Revision 1, and RR-37 Submittal Dated May 3, 2002 NRC TAC Nos. MB5009 and MB5010 Hatch proposed alternatives to use enhanced visual testing (VT) examinations in lieu of the ASME Section XI Code-required ultrasonic testing (UT) examinations of the reactor pressure vessel (RPV) inner nozzle radius sections. Unless otherwise specified, the following questions apply to both RR-34, Revision 1, and RR-37.

1. Provide a list/table of the nozzles, nozzle sizes, percent of coverage from prior examinations, and when (month/year) examined.

2. Discuss changes to examination coverage as a result of using VT (% surface) in lieu of the UT (% volume).

3. Identify the ASME Code Inservice Inspection Program: either A or B. Reference the appropriate IWB-2500-1 item number: either B3.20 or B3.100.

4. Discuss any changes in radiation exposure to personnel as a result of the change in examination method.

5. Provide a technical discussion that supports structural integrity, such as the Oak Ridge report mentioned in RR-37. Provide sufficient data for third party retrieval of the Oak Ridge report.

6. Describe the direct/enhanced visual examination systems and the resolution sensitivity that will be used during the examinations. Discuss how the 1-mil (0.001 inch) resolution sensitivity will be demonstrated for each system. Provide the same for the remote enhanced visual examination systems.

7. Provide a description for the performance of the proposed enhanced direct visual examination of the RPV nozzles that will assure a 1-mil resolution.

8. For each unit, provide the appropriate Code edition of the ASME Section XI, current inservice inspection (ISI) interval, and when the current ISI interval is over.

9. For RR-37, discuss the obstructions for each nozzle or group of nozzles that limit full coverage.

10. For RR-37, if leak-before-break is part of the bases for structural integrity of the vessel, provide the supporting technical justification.

Mail Envelope Properties (3DCBD926.1B2 : 2 : 19651)

Subject:

RAI: Hatch Relief Request RR-34, Revision 1, and RR-37 Creation Date: 11/8/02 10:32AM From: Joseph Colaccino Created By: JXC1@nrc.gov Recipients Action Date & Time southernco.com Transferred 11/08/02 10:33AM ifluker (INTERNet:ifluker@southernco.com) nrc.gov owf2_po.OWFN_DO Delivered 11/08/02 10:33AM DGN CC (Donald Naujock) Opened 11/08/02 11:21AM nrc.gov owf4_po.OWFN_DO Delivered 11/08/02 10:32AM JAN1 CC (John Nakoski) Opened 11/08/02 12:10PM Post Office Delivered Route southernco.com INTERNet owf2_po.OWFN_DO 11/08/02 10:33AM nrc.gov owf4_po.OWFN_DO 11/08/02 10:32AM nrc.gov Files Size Date & Time Hatch RR34R1 and RR37 RAIs.wpd 3616 11/08/02 10:18AM MESSAGE 1177 11/08/02 10:32AM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard Reply Requested: No Return Notification: None Concealed

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