ENS 45987

v t e 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. * * NOTIFICATION FROM KRITZER TO CROUCH AT 1553 EDT ON 6/8/10 * * * 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.

ENS 45987 +/-
Where
Vermont Yankee File:NorthStar Vermont Yankee icon.png 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
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v • d • e

v t e Emergency Notification System
Vermont YankeeFile:NorthStar Vermont Yankee icon.png with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2011-09-03T06:35:00 [Table view]
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