05000250/FIN-2014002-03
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Loose Breaker Control Power Fuse Holder Caused 3B ICW Pump to be Inoperable Longer than Allowed Outage Time |
| Description | On September 28, 2013, while Unit 3 was in Mode 1, operators discovered that power to the 3B intake cooling water (ICW) pump breaker closing circuit and charging springs was lost. The under current (UC) fuse holder was noted to be slightly backed out and not firmly in place which resulted in the loss of breaker control power. Control power was restored after the fuse holder was pressed back in place on September 29, 2013. The licensee performed an investigation that determined that the 3B ICW pump had been inoperable for approximately four days (the time the pump was last started until the fuse holder was fully re-inserted), which was longer than the allowed TS 3.7.3, Intake Cooling Water System, outage time of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Although operators performed a daily verification that the breaker control power available white indicating light was lit on the breaker cubicle, the licensee determined that reasonable assurance could not be established that the fuses had enough contact with the base to ensure power to the closing spring even though the white control power light was lit. Therefore, the licensee concluded that the 3B ICW pump was inoperable for four days prior to discovery of the fuse holder condition. The inspectors determined the ICW system would have been able to perform its function even with the 3B ICW pump inoperable. The 3A and 3C ICW pumps were available and only one ICW pump is needed to remove design basis heat loads. Based on the availability of the ICW system to perform its heat removal function; and the relatively short duration of the condition prior to its discovery on September 28, the inspectors concluded that the event was of very low safety significance. The inspectors determined that a violation of TS limiting condition for operation (LCO) 3.7.3, Intake Cooling Water System, occurred since Unit 3 was in Mode 1 and the 3B ICW pump was not returned to an operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or the unit shut down and placed in hot standby within the next six hours. Although a violation of the TS LCO occurred, the violation was not attributable to an equipment failure that was avoidable by reasonable licensee quality assurance measures or management controls. The inspectors concluded that the violation would normally be characterized as Severity Level IV based on its very low safety significance. The NRC exercised enforcement discretion (Enforcement Action (EA)-14-058) in accordance with Section 2.2.4.d of the Enforcement Policy because the violation was not associated with a licensee performance deficiency; and therefore, it will not be considered in the assessment process or the NRCs Action Matrix. This issue is documented in the licensees CAP as AR 1929130. Corrective actions included an investigation of the material condition of the fuse holder and base assembly, and a revision to the breaker operation procedure to include additional guidance on validating proper installation of the fuse holder when racking in a four kilovolt breaker. The LER is closed. |
| Site: | Turkey Point  |
|---|---|
| Report | IR 05000250/2014002 Section 4OA3 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | Violation: Severity level Enforcement Discretion |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | C Fontana D Rich M Endress M Speck R Carrion S Sanchez T Hoeg |
| Violation of: | Technical Specification - Procedures Technical Specification |
| INPO aspect | |
| ' | |
Finding - Turkey Point - IR 05000250/2014002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Turkey Point) @ 2014Q1
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||