ENS 51329
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ENS Event | |
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17:31 Aug 18, 2015 | |
Title | Residual Heat Removal Heat Exchanger Outlet Valves Unanalyzed Condition |
Event Description | At 1331 hours0.0154 days <br />0.37 hours <br />0.0022 weeks <br />5.064455e-4 months <br /> [EDT] on August 18, 2015 with the plant in mode 1, IP2 entered TS [Technical Specification] 3.0.3 upon determination by the Shift Manager that MOV-746 and 747 at the outlet of the Residual Heat Removal (RHR) Heat Exchangers may not (fully) open on an Sl [Safety Injection] signal if there was a degraded grid voltage (where the voltage at the 480V Safeguards Buses is below the minimum drop-out value of 415V and above the loss-of-voltage value of 206.6V). The MOV 746 and 747 valves are normally closed so the Sl signal with degraded voltage present could cause the fuses to fail. The time when the fuses would fail and the extent to which the MOVs open has not yet been analyzed. Immediate corrective actions was taken to replace the fuses with fuses that would not fail. The RHR trains were restored to an operable condition at 1419 and 1431 hours0.0166 days <br />0.398 hours <br />0.00237 weeks <br />5.444955e-4 months <br />. This event is potentially reportable under 10 CFR 50. 72(b)(3)(ii) and 10 CFR 50.72(b)(3)(v) since the condition has not yet been fully analyzed but has been corrected.
The plant remained at 100% power during the time of this event. All technical specification requirements were followed. The licensee will notify the NRC Resident Inspector and the State. |
Where | |
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Indian Point New York (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+2.12 h0.0883 days <br />0.0126 weeks <br />0.0029 months <br />) | |
Opened: | John Baker 19:38 Aug 18, 2015 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Aug 18, 2015 |
51329 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Indian Point with 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
WEEKMONTHYEARENS 536992018-10-28T04:00:00028 October 2018 04:00:00
[Table view]10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Non Essential Service Water Inoperable ENS 528362017-06-30T05:30:00030 June 2017 05:30:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Condensate Storage Tank Declared Inoperable ENS 518292016-03-29T20:45:00029 March 2016 20:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Baffle Bolt Indications Identified During Inservice Inspection ENS 513292015-08-18T17:31:00018 August 2015 17:31:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Residual Heat Removal Heat Exchanger Outlet Valves Unanalyzed Condition ENS 457652010-03-13T23:25:00013 March 2010 23:25:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Emergency Diesel Generators (Edgs) Declared Inoperable Due to Service Water Tagout ENS 425242006-04-25T09:00:00025 April 2006 09:00:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Service Water Piping Flooding Concern Impacts Rhr ENS 405922004-03-16T15:42:00016 March 2004 15:42:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Cable Separation Criteria Not Met 2018-10-28T04:00:00 | |
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