ENS Event | |
|---|---|
19:00 Oct 14, 2009 | |
| Title | Safety System Functional Failure - Alternate Safe Shutdown Source Range Neutron Monitor Inoperable |
| Event Description | At 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> on October 14, 2009, the power supply for neutron source range detector N-38 was determined to be unable to provide reliable power to detector N-38 and the detector was declared inoperable. Technical Specification (TS) 3.3.4 (Remote Shutdown) Basis Table 3.3.4-1, Function 1.a requires one channel. Technical Requirements Manual (TRM) 3.3.D (Appendix R Alternate Safe Shutdown Instrumentation) requires entry into the condition referenced in TRM Table 3.3.0-1 and entry into the applicable related TS referenced in TRM Table 3.3.D-1 when one or more required functions with one or more required instruments in Table 3.3.D-1 [are] inoperable. TRM Table 3.3.D-1, TRO 3.3.D1, neutron flux (source range only) lists and specifies detector N-38 only and references TS 3.3.4 Basis Table 3.3.4-1, Item 1a. Although there is an operable redundant source range neutron detector N-39, the only source range detector which has indication remote from the control room is N-38. Therefore, the safety function for safe shutdown remote from the control room for reactivity control in accordance with TS Basis Table 3.3.4-1, Function 1a can not be met with N-38 inoperable. The inability to meet the TS condition is a safety system functional failure. Actions are in progress to provide a reliable power supply for N-38. Unit 2 is at 100% and is not affected by the condition.
The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Indian Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
| Time - Person (Reporting Time:+-1.85 h-0.0771 days <br />-0.011 weeks <br />-0.00253 months <br />) | |
| Opened: | Dan Lyon 17:09 Oct 14, 2009 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Oct 14, 2009 |
| 45432 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 528012017-06-11T13:11:00011 June 2017 13:11:00
[Table view]10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Excessive Bonnet Leakage from Chemical Volume Control System Valve ENS 467822011-04-25T13:50:00025 April 2011 13:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Single Train Charging Pump Declared Inoperable ENS 463922010-11-04T05:23:0004 November 2010 05:23:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Charging Pump '23' Declared Inoperable During Surveillance Testing ENS 462222010-09-01T20:00:0001 September 2010 20:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Loss of Temperature Instrumentation ENS 454322009-10-14T19:00:00014 October 2009 19:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Safety System Functional Failure - Alternate Safe Shutdown Source Range Neutron Monitor Inoperable ENS 451522009-06-23T22:23:00023 June 2009 22:23:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Potentially Degraded Inventory Control During Shutdown ENS 442362008-05-23T07:30:00023 May 2008 07:30:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Charging Pump Declared Inoperable Due to Relief Valve Lifting Below Setpoint 2017-06-11T13:11:00 | |