ENS 46401
ENS Event | |
|---|---|
05:00 Sep 16, 2010 | |
| Title | Part 21 Report - Ups Motherboard Failed Pre-Service Inspection |
| Event Description | The information below is a summary of a report received via facsimile from QualTech NP dated November 8, 2010.
This letter provides notification per regulation 10 CFR Part21 concerning the discovery through testing and evaluation of (4) four UPS System motherboards that reported to have failed pre-service inspection prior to installation into a UPS system at Southern Nuclear- Farley Station Unit 1 TDAFWP UPS 'B' Section. Trentec (now known as QualTech NP) provided these safety related motherboards for installation on a UPS system manufactured by (OEM) Dependable Power System. The (4) four questionable motherboards were returned to QualTech NP for testing and evaluation to determine operability of their safety function including fit, form and function for use within the UPS System. Southern Nuclear Condition Report, CR2010109013, states 'Motherboard (DPS 20050061, SN 354, Trentec Tag # 7T55201 SN01) with different valued resistors and or different locations than original motherboard...' QualTech NP developed a new dedication plan (DPS2010.0 Rev.1) to evaluate the returned motherboards for fit, form and function. The plan involves visual inspection verification - QualTech NP compared the returned boards to DPS BOM lists to identify any differences; and functional performance verification - the functionality of the items were verified by performance testing as factory Go/No Go board tests using a UPS system to the parameters defined in the existing referenced dedication plans. Visual inspection of the motherboards found one resistor installed in the wrong location. Performance testing of motherboards found the resistor installed in the wrong location affected the safety function of the UPS system. The motherboard with the resistor installed in the wrong location failed to operate during performance testing. The motherboard was reworked by original equipment manufacturer (OEM) who removed the resistor in question and re-installed it in the correct location. The repaired motherboard was performance tested and found acceptable for safety function for use within the UPS system. QuaITech NP has reviewed its customer project / PO files and has determined the dedicated UPS system (2) and these motherboards with Date Code 2007 have only been provided to Southern Nuclear-Farley Station Unit 1 & 2 (total quantity- 4). Southern Nuclear- Farley Station Unit 1 & 2 has two (2) motherboards in service. QualTech NP has addressed the dedication and testing of motherboards by the developing a new dedication plan (DPS2010.0 Rev. 1). Southern Nuclear has reviewed and approved this new plan. QuaITech NP's conclusion is that the resistor in the wrong location on the motherboard caused the UPS system not to operate during performance testing and established the equipment would not perform its intended safety function. After rework, relocation of the resistor, and retesting the UPS system became operable and was performing its safety related function. QualTech NP has completed testing, evaluation, and repair of motherboards, no further action is required. |
| Where | |
|---|---|
| Qualtech Np Cincinnati, Ohio (NRC Region 3) | |
| Organization: | Curtiss Wright Flow Control Co. |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+1279.8 h53.325 days <br />7.618 weeks <br />1.753 months <br />) | |
| Opened: | Kurt Mitchell 13:48 Nov 8, 2010 |
| NRC Officer: | John Knoke |
| Last Updated: | Nov 8, 2010 |
| 46401 - NRC Website | |
Qualtech Np with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | |
WEEKMONTHYEARENS 464012010-09-16T05:00:00016 September 2010 05:00:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Report - Ups Motherboard Failed Pre-Service Inspection 2010-09-16T05:00:00 | |