Current Event Notification Report for February 4, 2010
FARLEY -TWO OF THREE TRAINS OF AUXILIARY FEED WATER DECLARED INOPERABLE
| TWO OF THREE TRAINS OF AUXILIARY FEED WATER DECLARED INOPERABLE |
SOUTH TEXAS - TECHNICAL SPECIFICATION SHUTDOWN REQUIRED DUE TO CONTROL ROD OUT OF ALIGNMENT
"A shutdown of South Texas Project Unit 1 was initiated at 13:44 hours [CST] on February 3, 2010. When in Action b.2. of Technical Specification (TS) 3.1.3.1, 'Moveable Control Assemblies Group Height,' a second control rod, B-12, in Shutdown Bank A was declared inoperable when the rod came out of alignment with the remainder of the rods within its bank. The second control rod came out of alignment during the performance of Surveillance Requirement 4.1.3.1.2; a surveillance to determine operability by movement of the rod.
"For the above condition, Action c. of TS 3.1.3.1 was entered. When the requirements of the action could not be met, South Texas Project Unit 1 entered TS 3.0.3. and a plant shutdown was initiated.
"Prior to initiation of this event, South Texas Project Unit 1 was in Action b.2 [of TS 3.1.3.1] with rod C-5 of Shutdown Bank D trippable but inoperable due to causes other than addressed by Action a. The inoperable rod, C-5, was aligned within 12 steps of the remainder of the rods within its group and the rod sequence and insertion limits as specified in the Core Operating Limits Report were being maintained."
At the time of this report, South Texas Project Unit 1 was at 30% power and decreasing. The plant will enter Mode 3, Hot Shutdown, at approximately 1800 CST. Shutdown was initiated when rod B-12 could not be aligned within 12 steps of the remainder of rods within its bank as specified in Action c. of TS 3.1.3.1.
* * * UPDATE FROM BOB SCARBOROUGH TO HOWIE CROUCH @ 2220 EST ON 2/03/10 * *
"At 1730 [CST] during performance of the Unit 1 shutdown, control rod H-2 in Bank 1C inserted from 246 steps, as indicated by the digital rod-position indication system, to 234 steps indicated without a demand signal applied to the control bank. The group step counter remained at 249 steps with no other rods in Bank 1C indicating movement.
"The shutdown continued normally from that point. Control rod H-2 stepped with the rest on the rods in the bank down to zero steps. All control rods in Unit 1 are at zero steps. The shutdown rods are currently withdrawn."
CLINTON - FEEDWATER CHECK VALVE LEAK RATE EXCEEDED TECHNICAL SPECIFICATION REQUIREMENT
"At 1100 [CST] on February 3, 2010, it was discovered that a primary containment local leak rate test performed on feedwater check valve 1B21-F032B exceeded its acceptance criteria. Technical Specification Surveillance Requirement (SR) 3.6.1.3.11 requires that the combined leakage rate for both primary containment feedwater penetrations to be less than or equal to 2 gallons per minute. The measured leakage for 1B21-F032B was reported to be 2.5 gallons per minute (gpm). Operations immediately declared 1B21-F032B inoperable and initiated action to close the feedwater inlet shutoff valve 1B21-F065B to isolate the affected penetration. At 1136 [CST], 1B21-F065B was closed and its breaker was turned off to comply with TS 3.6.1.3, Condition C required actions.
"At 1447 [CST], the Feedwater Leakage Control System (FWLCS) was declared inoperable in accordance with LCO 3.6.1.9 and the plant entered a 30-day action to restore FWLCS to an operable condition.
"After performance of a line flush, plans are underway to attempt to re-perform the local leak rate test for the feedwater check valve, 1B21-F032B. If unsuccessful, further corrective actions will be taken.
