ENS Event | |
|---|---|
06:28 Aug 22, 2012 | |
| Title | Tech Spec Required Shutdown Due to Reactor Coolant System Pressure Boundary Leak |
| Event Description | On August 22, 2012, it was determined, based on a remote video camera inspection inside the secondary shield wall, that a primary system leak at a Pressurizer Heater bundle exists and is not isolable. Technical Specification (TS) Limiting Condition for Operation (LCO) 3.1.6.4 does not allow any leakage through a nonisolable RCS strength boundary. The discovery of leakage from the Pressurizer Heater bundle is considered a degradation of a principal safety barrier. This condition does not represent a reduction in the public health and safety.
This is reportable as a 4-hour ENS notification under 10CFR50.72(b)(2)(i) due to the initiation of a nuclear plant shutdown required by the plant's Technical Specifications. The licensee notified the NRC Resident Inspector. The licensee expects to also notify state and local government agencies of the shutdown. The current leak rate, as calculated by the plant process computer, is approximately .2 gallons per minute. |
| Where | |
|---|---|
Three Mile Island  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| LER: | 05000289/LER-2012-003 |
| Time - Person (Reporting Time:+-2.58 h-0.108 days <br />-0.0154 weeks <br />-0.00353 months <br />) | |
| Opened: | William Price 03:53 Aug 22, 2012 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Aug 22, 2012 |
| 48220 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 482202012-08-22T06:28:00022 August 2012 06:28:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Reactor Coolant System Pressure Boundary Leak ENS 424062006-03-11T06:00:00011 March 2006 06:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit Entered a T.S. Required Shutdown After Declaring Both Condenser Offgas Radiation Monitors Inoperable 2012-08-22T06:28:00 | |