ML101600189
| ML101600189 | |
| Person / Time | |
|---|---|
| Site: | Farley, San Onofre  |
| Issue date: | 06/04/2010 |
| From: | Menichino J Dresser-Rand |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML101600189 (3) | |
Text
DRESSER-RAND Wellsville Operations 37 Coats Street P.O. Box 592 Wellsville, NY 14895 PH: 585-593-1234 June 4, 2010 To:
Documentation Control Desk US Nuclear Regulatory Commission Washington, DC, 20555
Subject:
10CFR Part 21 Final Report Dresser-Rand No. 042 To Whom It May Concern-Attached find a copy of Dresser-Rand Final Part 21 Report Number 042. It is directed at a Digital Control System Output Filter. Initial Report Number 042 was submitted to the NRC via confirmed fax on 5/11/2010.
The anomaly was recently discovered during an outage at the Farley Nuclear Power station. The plant was installing Dresser-Rand's Digital Control System Conversion on the Emergency Feedwater Terry Steam Turbine.
The problem was contained immediately. The 2 plants that were affected are Farley Nuclear Power Station and San Onofre Nuclear Power Station. Both plants have been notified of the issue and have implemented corrective action.
Please call me at 585-596-3406 if there are any questions related to this issue.
e-Menichino Manager, Navy/Nuclear Product Engineering Dresser-Rand Government Business Unit AIfZJ~
FINAL REPORT 10CFR PART 21 REPORT OF A POTENTIAL SAFETY HAZARD Report No.
42 Page 1 of 2 PREPARED BY: /
File No:
37858A/40101A V'-rkI c
Serial No:
37858A/40101A TITLE:
Navy Nuclear P'ioduct Engineer Type:
GS2 Ref:
PART NAME:
Output Filter Network DR Part No:
890313-001 DR Dwg No:
890313 APPROVAL:
6%
- iv Rev. Level:
N/A
- 1. DESCRIPTIO OF DEFVCT OR NON-COMPLIANCE The Output Filter Network part # 890313-001 is manufactured at Introl Design for use in the Dresser-Rand digital speed control system for RCIC and Auxiliary Feedwater turbines. The procedure for assembling the printed circuit board is to crimp and solder eyelets on both sides of the board prior to mounting the motor connections terminal block. This procedure was not followed on serial #s 10007 through 10012. For this batch, the eyelets were not soldered to the board on the terminal block side. As a result, the connection between the p.c. board trace and the terminal block may be broken when the connection is stressed such as when tightening wire connections on the terminal block.
- 2. POTENTIAL SAFETY HAZARD OR NON-COMPLIANCE The result of a broken connection in the output filter network would be to lose power to the actuator controlling governor valve position. The control system would not be able to regulate turbine speed. If a GS-2 turbine start were initiated, the governor valve would open wide resulting in an overspeed trip of the turbine.
- 3. NUMBER AND LOCATION OF ALL COMPONENTS Serial # 10007 - Originally sold to SONGS as a spare for digital control system - removed from service and recommend return to DR for inspection and refurbishment.
Serial # 10008 - Originally installed in SONGS turbine control panel for unit 3 - removed from service and recommend return to DR for inspection and refurbishment.
Serial # 10009 - In Dresser-Rand inventory - was inspected and repaired by Introl Design Serial # 10010 - Originally installed in SONGS turbine control panel for unit 2 - removed from service and recommend return to DR for inspection and refurbishment.
Serial # 10011 - Originally sold to Farley NPP for spare. This was installed in control system for unit 2. Unit was removed from service, returned to DR, inspected, and repaired. Returned to Farley NPP and is in spares inventory.
Serial # 10012-In Introl Design inventory. Unit was inspected, repaired, and returned to inventory.
NNSOP12001F1 (Final Report 10 CFR Part 21 Report of a Potential Safety Hazard), REV. 00, 25JUN08 Reference NNSOP-1-2-001
FINAL REPORT 10CFR PART 21 REPORT OF A POTENTIAL SAFETY HAZARD Report No.
42-Page 2 of 2
- 4. CORRECTION ACTION BY: I Mark Koniecznv I COMPLETED BY I Mark Konieczny The affected batch of filters is recommended to be returned to Dresser-Rand for inspection, repair, and testing. As of this date, both customers have been notified of the defect, have removed affected filters from service and inventory, and Dresser-Rand recommends the units be returned for inspection and refurbishment. Dresser-Rand and Introl Design have uncovered the problem, have improved procedures to eliminate a repeat of the problem and have required additional testing of the output filter network prior to delivery to future customers. A failure analysis has been performed and the details of this analysis are in Dresser-Rand EL 20947.
- 5. ADVICE TO AFFECTED CLIENTS RELATED TO THIS REPORT Clients have been advised of the potential risk and have removed affected units from service.
Clients have been instructed on the inspection method to verify proper operation of the filter.
NNSOP12001F1 (Final Report 10 CFR Part 21 Report of a Potential Safety Hazard), REV. 00, 25JUN08 Reference NNSOP-1-2-,001