ML091460763
| ML091460763 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/22/2009 |
| From: | Arizona Public Service Co |
| To: | Hall J Plant Licensing Branch IV |
| Hall, J R, NRR/DORL/LPL4, 301-415-4032 | |
| Shared Package | |
| ML091460692 | List: |
| References | |
| PRR-8, TAC ME1346 | |
| Download: ML091460763 (13) | |
Text
Palo Verde Nuclear Generating Station Discussion Relief Request HPSI 3B 5/22/08
Discussion Topics
- Overview of Reason for Request
- Pump Description
- Maintenance Performed 3R14
- Problem Description / Repairs Performed 2
- Problem Description / Repairs Performed
- Code Requirements
- Current Plant Status
- Proposed Pump Demonstration Testing
- Basis for Relief Request
Overview of Reason for Request
- High Pressure Safety Injection Pump 3B
- New Pump Seal Installed
- Installation Difficulties Required Replacement
- Bearing Replacement Performed
- Code Requires Full Flow Test 3
- Normally Conducted Open Vessel (Reactor Defueled)
- Unit 3 Approaching Mode 4 When Discovered
- Request Deviation from Full Flow Test
- Conduct Maxi Flow Test Approx 80% Full Flow
- No Impact to Pump Flow Characteristics during Maintenance
- Full Flow Test Conducted this Outage
- Plant not in Optimal Alignment to conduct Full Flow Test
Pump Description
- High Pressure Safety Injection Pump
- Centrifugal Pump
- Ingersol - Rand Model 4X11CA-8 PM being performed to Upgrade Seal 4
- PM being performed to Upgrade Seal
- Pump Performance Acceptable Prior to Refuel
- Post Maintenance Full Flow Test Acceptable Results
Maintenance Performed 3R14
- 4/25-4/30/09 - Scheduled PM
- Removal/replacement of mechanical seal
- 5/3 - Initial Fill - Outboard Mech Seal Leak 5
- Small Piece of Carbon Material Found
- Reassembled outboard seal/bearing
- ISLT and Section XI testing completed satisfactorily
Maintenance Performed 3R14
- 5/6 - 5/19 HPSI B Pump Sat Idle
- Observed Leakage from outboard seal
- Initially ~ 1/2 gpm 6
Initially 1/2 gpm
- Reduced to ~ 1 drop/sec at End of 4 hrs
7
8
Repairs Performed
- Entered Level B Troubleshooting Plan
- OEM Vendor Support
- Determined Cause of Seal Leakage -
Improper Alignment of Seal Faces 9
Improper Alignment of Seal Faces
- Outboard Seal Damaged Due to Misalignment
- Thrust Bearing (damaged during removal)
- Performed repairs to HPSI B outboard seal w/
replacement of thrust bearing
Code Requirements
- ISTB-3310 Effect of Pump Replacement, Repair, and Maintenance on Reference Values If R f V l S t f V l M
h 10
- If Reference Value or Set of Values May have been effected by repair or replacement
- Bearing Replacement May Affect
- New Reference Values shall be determined
- By a Comprehensive or Group A Test Run
- Prior to declaring pump operable
Current Plant Conditions At Time of Determining Retest
- Reactor Reassembly Complete
- Primary Plant Solid
- Drawing a Bubble in the Pressurizer 11
- RCP Sweeps in Progress
- Normal Full Flow Test Conducted with
- Fuel Off Loaded
- Reactor Vessel Open
Proposed Pump Demonstration Testing
- 2 Hour Run
- Verify Correct Seal Operation
- Change Bearing Oil
- Collect vibration data Additi l 2 h R
(1 dditi l
12
- Additional 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Run (1 additional as a minimum)
- Vibration measured and analyzed at each point
- Utilize Max Recirc Flow Alignment
- At least 750 gpm versus 1040 gpm design
- Acceptable in Mode 5
Basis for Relief Request
- New Bearing is Only Cause for Comprehensive Flow Test
- No Change to Pump Characteristics
- Successful Comprehensive Flow Test 13 Successful Comprehensive Flow Test Performed this Refuel Outage
- Vibration Data at Min Flow Generally worse than Full Flow
- Testing Under Current Plant Conditions Not Typical Configuration for Full Flow Testing