ENS Event | |
|---|---|
15:26 Jun 8, 2010 | |
| Title | Technical Specification Required Shutdown Due to Primary Containment Leak Greater than Limits |
| Event Description | On 6/8/10 at 10:15, primary containment was declared inoperable and a 24 [hour] Limiting Condition for Operation (LCO) was entered due to Engineered Safety Features leakage in excess of the 1.0 gpm value assumed in the Alternative Source Term (AST) analysis as described in the UFSAR.
The leakage was from the 'B' RHR heat exchanger relief valve (SR-10-86B) and was estimated at 1.25 gpm. On 6/8/10 at 11:26, commenced a power reduction for a Technical Specification required shutdown per TS 3.7.A.8. Actions Taken: Isolating the 'B' RHR system per Technical Specifications that will allow us to exit the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LCO. Planning to replace the relief valve. Verified relief valve on 'A' RHR system is not leaking. The licensee has notified State and local authorities and the NRC Resident Inspector. The licensee also anticipates a press release.
The licensee exited the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LCO TS required shutdown condition at 1548 EDT based on isolation of the 'B' RHR system. R1DO (Henderson) notified. |
| Where | |
|---|---|
Vermont Yankee  Vermont (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-0.27 h-0.0113 days <br />-0.00161 weeks <br />-3.69846e-4 months <br />) | |
| Opened: | James Kritzer 15:10 Jun 8, 2010 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jun 8, 2010 |
| 45987 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (99 %) |
WEEKMONTHYEARENS 472382011-09-03T06:35:0003 September 2011 06:35:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Rhr/Cs Room Cooler Being Inoperable ENS 459872010-06-08T15:26:0008 June 2010 15:26:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Primary Containment Leak Greater than Limits ENS 402022003-09-27T11:40:00027 September 2003 11:40:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Rcs Leakage Increase Greater than 2 Gpm 2011-09-03T06:35:00 | |