ML093360121
| ML093360121 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/02/2009 |
| From: | Plant Licensing Branch IV |
| To: | Southern California Edison Co |
| Hall, J R, NRR/DORL/LPL4, 301-415-4032 | |
| Shared Package | |
| ML093360110 | List: |
| References | |
| TAC ME2340, TAC ME2341 | |
| Download: ML093360121 (1) | |
Text
ENCLOSURE OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION THIRD TEN-YEAR INSERVICE INSPECTION INTERVAL RELIEF REQUEST ISI-3-30, INSPECTION OF REACTOR VESSEL HEAD IN-CORE INSTRUMENT NOZZLES SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 SOUTHERN CALIFORNIA EDISON DOCKET NUMBERS: 50-361 AND 50-362 By letter dated October 2, 2009 (Agencywide Document Access and Management System Accession Number ML092790155), Southern California Edison (SCE) requested relief from the inspection coverage requirements of American Society of Mechanical Engineers Code Case N-729-1, as conditioned by Title 10 of the Code of Federal Regulations 50.55a(g)(6)(ii)(D), for the San Onofre Nuclear Generating Station (SONGS), Units 2 and 3, for the third 10-year inservice inspection interval. The U.S. Nuclear Regulatory Commission staff has reviewed the relief request and has determined that the information specified in this Request for Additional Information is needed to complete its evaluation.
- 1. Please describe the spatial extent, i.e., the distance above the root of the J-groove weld and the distance below the toe of the J-groove weld, of the eddy current (ECT) examination and the ultrasonic (UT) time of flight diffraction (TOFD) examination.
- 2. Please provide a best estimate of the fractional volume of the in-core instrument nozzle (ICI) nozzle material which could be successfully evaluated from the nozzle ID using UT TOFD examination for each ICI nozzle. This evaluation should be restricted to the volume of the nozzle from the root of the J-groove weld to 2 inches below the root or the end of the nozzle, whichever is less.