ENS 46605

v t e ENS Event
00:04 Feb 10, 2011
Title	Pressure Boundary Leakage
Event Description	At 1830 CST on 02/09/11, LaSalle Unit 1 commenced a Technical Specification required plant shutdown, due to identification of pressure boundary leakage. At 1804 CST on 02/09/11, it was identified that 1E51-F076, Reactor Core Isolation Cooling System Steam Supply Inboard Isolation Bypass Warmup Valve, had a one inch crack in a weld on the pressure seal joint. This qualifies as pressure boundary leakage, which requires entry into Tech Spec 3.4.5, RCS Operational Leakage, Required Action C, to be in Mode 3, Hot Shutdown, by 0604 on 02/10/11, and Mode 4, Cold Shutdown, by 0604 on 02/11/11 . At the time of discovery, Unit 1 was in startup mode following a forced outage. A repair plan is being prepared at this time and the Unit will remain in cold shutdown until repairs are complete. This is an unisolable leak. Reactor pressure is 913 psig. The licensee notified the NRC Resident Inspector.

ENS 46605 +/-
Where
LaSalle Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
Time - Person (Reporting Time:+-4.08 h-0.17 days <br />-0.0243 weeks <br />-0.00559 months <br />)
Opened:	John Van Fleet 19:59 Feb 9, 2011
NRC Officer:	Mark Abramovitz
Last Updated:	Feb 9, 2011
46605 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
LaSalle with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2025-12-29T22:00:00 [Table view]
[ENS list for LaSalle]

Navigation menu