ENS 48943
ENS Event | |
|---|---|
19:00 Apr 18, 2013 | |
| Title | Pin Holes Leaks Identified in High Pressure Core Spray System |
| Event Description | {{#Wiki_filter:This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), 'Event or Condition that could have prevented fulfillment of a Safety Function needed to Mitigate the Consequences of an Accident', and also 10CFR50.72(b)(3)(ii)(A), 'Degraded or Unanalyzed Condition'. At 1400 [CDT] on 4/18/13, 3 pin hole leaks were identified in the Unit 2 High Pressure Core Spray System (HPCS) minimum flow valve flow line, between the minimum flow valve and the Primary Containment Suppression Pool in the Reactor Building Raceway. The leak is approximately � gallon per minute. This could have prevented the Primary Containment, a single train safety system, from performing its design function, and also results in the nuclear power plant, including its principal safety barriers, being seriously degraded. In addition, the Unit 2 HPCS System, a single train system, has been declared inoperable, and has also lost function due to the minimum flow line leak. This is reportable as an 8 hour ENS [Event Notification System] notification.
At the time the leak was identified, Both LaSalle Unit 1 and 2 are in Hot Shutdown, following a loss of Offsite Power on 4/17/13. Unit 2 will remain shut down until repairs are made to the Unit 2 HPCS minimum flow line leak. Unit 2 will be placed in Mode 4 and remain in Mode 4 until repairs are complete. The licensee has informed the NRC Resident Inspector. }}[[Event description::Description::{{#Regex_clear:This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), 'Event or Condition that could have prevented fulfillment of a Safety Function needed to Mitigate the Consequences of an Accident', and also 10CFR50.72(b)(3)(ii)(A), 'Degraded or Unanalyzed Condition'. At 1400 [CDT] on 4/18/13, 3 pin hole leaks were identified in the Unit 2 High Pressure Core Spray System (HPCS) minimum flow valve flow line, between the minimum flow valve and the Primary Containment Suppression Pool in the Reactor Building Raceway. The leak is approximately � gallon per minute. This could have prevented the Primary Containment, a single train safety system, from performing its design function, and also results in the nuclear power plant, including its principal safety barriers, being seriously degraded. In addition, the Unit 2 HPCS System, a single train system, has been declared inoperable, and has also lost function due to the minimum flow line leak. This is reportable as an 8 hour ENS [Event Notification System] notification. At the time the leak was identified, Both LaSalle Unit 1 and 2 are in Hot Shutdown, following a loss of Offsite Power on 4/17/13. Unit 2 will remain shut down until repairs are made to the Unit 2 HPCS minimum flow line leak. Unit 2 will be placed in Mode 4 and remain in Mode 4 until repairs are complete. The licensee has informed the NRC Resident Inspector. }}| ]] |
| Where | |
|---|---|
LaSalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+2.53 h0.105 days <br />0.0151 weeks <br />0.00347 months <br />) | |
| Opened: | Michael Fitzpatrick 21:32 Apr 18, 2013 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Apr 18, 2013 |
| 48943 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Shutdown (0 %) |
| After | Hot Shutdown (0 %) |