ENS Event | |
|---|---|
18:40 Aug 7, 2015 | |
| Title | Degraded Condition Due to Pressure Boundary Leakage on Vent Line Welded Joint |
| Event Description | This notification is being provided in accordance with 10 CFR 50.72(b)(3)(ii)A, Degraded Condition.
At 1340 CDT on 8/7/15, on LaSalle Unit 2, a through-wall (welded joint) leak was identified on a 3/4 inch vent line off of the bonnet of the 2B33-F067B, 2B Reactor Recirculation Pump Discharge Valve. This condition qualifies as pressure boundary leakage, which requires entry into Technical Specification 3.4.5, Reactor Coolant System Operational Leakage, Required Action C, to be in Mode 4, Cold Shutdown, by 0140 on 8/9/15. This leakage is significantly less than 10 gpm [leak rate is 0.2 gpm] and therefore, does not meet the threshold for entry into the Emergency Action Plan. At the time of discovery, Unit 2 was in Mode 3 - Hot Shutdown, heading into Cold Shutdown for a planned maintenance outage. This event does not affect Unit 1. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
LaSalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
| LER: | 05000374/LER-2015-003 Regarding Reactor Recirculation Loop Discharge Isolation Valve Vent Line Leak Due to Weld Defect |
| Time - Person (Reporting Time:+1.3 h0.0542 days <br />0.00774 weeks <br />0.00178 months <br />) | |
| Opened: | Steve Churchill 19:58 Aug 7, 2015 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Aug 7, 2015 |
| 51300 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Shutdown (0 %) |
| After | Hot Shutdown (0 %) |
WEEKMONTHYEARENS 581022025-12-29T22:00:00029 December 2025 22:00:00
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