ML092950517
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| ML092950517 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/22/2009 |
| From: | Hall J Plant Licensing Branch IV |
| To: | Stroud R Arizona Public Service Co |
| Hall, J R, NRR/DORL/LPL4, 301-415-4032 | |
| Shared Package | |
| ML092950512 | List: |
| References | |
| TAC ME1634, TAC ME1635, TAC ME1636 | |
| Download: ML092950517 (1) | |
Text
REQUEST FOR ADDITIONAL INFORMATION ON THIRD 10-YEAR INSERVICE INSPECTION INTERVAL REQUEST FOR RELIEF NO. 40 ARIZONA PUBLIC SERVICE COMPANY PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 DOCKET NUMBERS 50-528, 50-529 AND 50-530
- 1. In Tables 2.1-3, 2.2-3, and 2.3-3, of the Attachment to the July 1, 2009 relief request, values are given for Cu, Ni, and chemistry factor (CF). These compositions are not all consistent with Nuclear Regulatory Commission (NRC) records in the Reactor Vessel Integrity Database (RVID), or the Palo Verde UFSAR (specifically for the axial and circumferential welds). Please explain where the Cu, Ni, and CF values cited in the tables were previously accepted by the NRC, or provide new data.
- 2. Table 2.1-2 indicates that a flaw was found in the Palo Verde Nuclear Generating Station, (PVNGS) Unit 1 reactor pressure vessel. Please cite the flaw evaluation as well as the calculation inputs that were used to determine that 29.83 flaws of similar size are acceptable per the proposed pressurized thermal shock rule, Title 10 of the Code of Federal Regulations 50.61a, Alternate Fracture Toughness Requirements for Protection Against Pressurized Thermal Shock Events.
- 3. Tables 2.1-1, 2.2-1, and 2.3-1 state that PVNGS, Units 1, 2, and 3 are bounded by 13 heatups/cooldowns per year. Please cite the plant design basis for heatup/cooldowns per year for each unit.