05000456/FIN-2009003-04
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Finding | |
|---|---|
| Title | Failure of Containment Sump Suction Valve 1SI8811B to Stroke Open |
| Description | On June 24, 2009, the licensee began a planned work window on the 1B Residual Heat Removal train. Part of the planned work included an 18-month surveillance to stroke open the 1B Containment ECCS Sump Suction Valve, 1SI8811B. The 1SI8811B valve is a normally closed motor operated valve that provides a containment isolation function. The valve is required to open to provide a suction source from the ECCS sump to the 1B Residual Heat Removal train for the recirculation phase of emergency core cooling. During performance of the surveillance the valve stopped moving at approximately 35 percent open and failed to stroke. The licensee entered TS 3.6.3, Condition A, due to the inoperable containment isolation function and was already in TS 3.5.2 Condition A for the 1B Residual Heat Removal train work. Initial troubleshooting activities identified a corroded torque switch as the cause of the stroke failure. The licensee replaced the torque switch and the limit switch, and performed several other planned preventive maintenance tasks prior to returning the valve to service on June 26, 2009. To address extent of condition, the licensee completed a successful stroke of the 1SI8811A valve on June 30, 2009, as previously scheduled. At the conclusion of the inspection period, the licensee was performing a past operability evaluation of the 1SI8811B valve. This evaluation will include an analysis of the flow characteristics of the valve at approximately 35 percent open. An URI was opened pending further review of this issue. |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2009003 Section 1R22 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | A Garmoe B Dickson M Holmberg M Mitchell M Perry M Thorpe Kavanaugh R Jones R Ng R Skokowski T Hartmanr Ngb Dickson M Mitchell B Palagi R Walton M Perry A Garmoe R Skokowski M Thorpe-Kavanaugh T Hartman J Gallb Dicksonl Kozak N Valos R Skokowski A Garmoe |
| INPO aspect | |
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Finding - Braidwood - IR 05000456/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2009Q2
Self-Identified List (Braidwood)
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