ENS 43895
ENS Event | |
|---|---|
22:22 Jan 11, 2008 | |
| Title | Tech. Spec. Required Shutdown Due to Gas Voiding in Discharge Piping |
| Event Description | Gas intrusion into ECCS piping required entry into Technical Specification (TS) 3.0.3.
Wolf Creek was operating at 100% power when gas voiding was discovered in RHR discharge piping common to both trains of ECCS. Due to void reoccurring in excess of predetermined limits both trains of ECCS were declared inoperable at 1525 CST. A TS required shutdown was commenced at 1622. Engineering is researching the composition of the gas and possible sources." The licensee must determine that the line is solid with fluid without any gas voiding before exiting the TS required shutdown. All normal and emergency power supplies are available. All EDG's are operable. Reactor power is being reduced one-half a percent per minute. The licensee notified the NRC Resident Inspector.
At 1550 [CST] on 1/14/2008, Engineering notified control room that the A RHR pump suction from the recirc sump has a void in excess of the allowable limit. Due to the isolation of the 'piggyback' line from the A RHR to the suction of the CCPs, [Wolf Creek] no longer has 'at least the ECCS flow equivalent to a single OPERABLE ECCS train available.' [Wolf Creek] has already entered condition B of 3.5.2 and the cooldown requirement from action B of 3.5.2 is more restrictive than the cooldown requirement of 3.0.3. No additional actions need to be taken to comply with Tech Specs. At 1700 [CST] on 1/14, Engineering reports that the voids in the 'piggyback' line has been filled to within acceptable limits. The licensee will notify the NRC Resident Inspector. Notified the R4DO (Spitzberg) |
| Where | |
|---|---|
Wolf Creek  Kansas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-4.48 h-0.187 days <br />-0.0267 weeks <br />-0.00614 months <br />) | |
| Opened: | Jeff Isch 17:53 Jan 11, 2008 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Jan 14, 2008 |
| 43895 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (97 %) |
WEEKMONTHYEARENS 545082020-02-02T00:45:0002 February 2020 00:45:00
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