ENS 50807
ENS Event | |
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22:50 Feb 10, 2015 | |
Title | High Head Safety Injection Inoperable Due to Missing Piping Support |
Event Description | This is a non-emergency 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> report in accordance with 10 CFR 50.72(b)(3)(ii)(B).
At 1750 [EST] hours on 2/10/15, Unit 4 entered Technical Specification 3.0.3 due to missing tubing supports identified for two separate high point vent lines. This condition is unanalyzed and potentially rendered the cold leg High Head Safety Injection flow path inoperable. Upon discovery, the vent line root isolation valves were closed and Technical Specification 3.0.3 was exited at 1805. Investigation has been initiated to determine cause. The licensee has notified the NRC Resident Inspector.
The licensee is retracting this report based on the following: On 2/11/2015 at 0103 EST, Event Notification 50807 reported to the Nuclear Regulatory Commission Operations Center (NRCOC) the potential inoperability of the Unit 4 cold leg High Head Safety Injection (HHSI) piping due to missing tubing supports on two separate high point vent lines. Subsequent analysis has determined that the Unit 4 HHSI cold leg injection flow path to the reactor coolant system (RCS) remained operable with the missing vent line tubing supports and its safety related function was not affected. The Unit 4 HHSI system discharge flow path to the RCS had been operable with the missing vent line tubing supports, Technical Specification (TS) requirements were met, and entry into TS 3.0.3 was not required. The HHSI system remained capable of fulfilling the safety function to mitigate the consequences of an accident on Unit 4. Therefore, the immediate notification to the NRCOC on 2/11/2015 at 0103 EST in accordance with 10 CFR 50.72(b)(3)(ii)(B) is hereby retracted. The licensee informed the NRC Resident Inspector. Notified R2DO (Walker). |
Where | |
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Turkey Point Florida (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+2.22 h0.0925 days <br />0.0132 weeks <br />0.00304 months <br />) | |
Opened: | Jay Van Hulzen 01:03 Feb 11, 2015 |
NRC Officer: | Jeff Rotton |
Last Updated: | Mar 31, 2015 |
50807 - NRC Website
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Unit 4 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 508072015-02-10T22:50:00010 February 2015 22:50:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition High Head Safety Injection Inoperable Due to Missing Piping Support ENS 445622008-10-11T09:45:00011 October 2008 09:45:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Vendor Calculation Error ENS 411022004-10-07T18:00:0007 October 2004 18:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Single Point Vulnerability in Emergency Containment Filter Dousing System 2015-02-10T22:50:00 | |