05000254/FIN-2009005-04
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Finding | |
|---|---|
| Title | Failure of RHR Torus Spray Isolation Valve to Open Due to Declutch Mechanism Problems |
| Description | A finding of very low safety significance and a NCV of TS 3.6.2.4, Residual Heat Removal (RHR) Suppression Pool Spray, was self-revealed for the licensees failure to meet the Technical Specification (TS) limiting conditions of operation (LCO) requirement prior to transitioning into an operating mode where the LCO was required to be satisfied. Specifically, Motor Operator (MO) 1-1001-37B for the Unit 1 RHR torus (suppression pool) spray isolation valve was found to have been inoperable when the operating crew transitioned Unit 1 from Mode 4 to Mode 2 on May 30, 2009. The valve actuator had been inadvertently declutched (i.e., motor disengaged) and the valve was not demonstrated operable by stroking the valve electrically after the actuator motor was declutched. Inspectors determined that the finding was cross-cutting in the area of Problem Identification and Resolution - Corrective Action (P.1(a)) because plant personnel failed to identify the physical contact with the valve actuator that resulted in the valve being declutched; therefore, operators incorrectly assessed the system condition as in compliance with TS 3.6.2.4. Immediate licensee corrective actions included engagement of the motor and stroke testing of the valve. The finding is more than minor because it was associated with the equipment performance quality attribute of the Mitigating Systems Cornerstone and affected the objective of ensuring availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, failure to verify system availability and capability prior to entering the required modes resulted in fewer available mitigating systems than assumed in the operating risk evaluations. The inspectors determined the finding could be evaluated using the SDP in accordance with IMC 0609, Significance Determination Process, Attachment 0609.04, Phase 1 - Initial Screening and Characterization of findings, Table 4a. Inspectors answered all of the questions for the Mitigating Systems Cornerstone No. Therefore, the finding screened as Green or very low safety significance. |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2009005 Section 4OA3 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | B Cushman C Mathews C Moore J Mcghee M Bielby M Mitchell M Ring R Jickling R Orlikowski |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
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Finding - Quad Cities - IR 05000254/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2009Q4
Self-Identified List (Quad Cities)
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