ENS 45307
ENS Event | |
|---|---|
03:10 Aug 28, 2009 | |
| Title | Non-Conservative Technical Specification Setpoints Discovered |
| Event Description | Non-conservative Tech Spec setpoints were discovered that affected Steam Leak Detection for Unit 1 and Unit 2 [High Pressure Coolant Injection] HPCI room high differential temperatures. During a steam leak detection system design basis leak, the present temperature setpoint would not isolate the HPCI steam supply piping.
A calculation has been performed by engineering which demonstrates that, with both room coolers secured, a design basis steam leak will result in the room ventilation differential temperature exceeding the present Tech Spec setpoints. At this time, the room unit coolers have been secured and HPCI and the associated steam leak detection system remain operable. Calculations are in-progress by engineering for changes to the high differential temperature steam leak detection setpoint. The licensee notified the NRC Resident Inspector.
This is a retraction of the event notification made on 8/28/09 at 0113 EDT. This event (#45307) was initially reported as a condition that could have prevented fulfillment of a safety function under the requirement of 10 CFR 50.72 (b)(3)(v)(c). A follow-up review of the HPCI equipment room steam leak detection system calculations determined that other HPCI equipment room ambient high temperature instruments would have automatically actuated a HPCI steam line isolation during a 25 gpm design basis HPCI steam line leak event. Therefore, a condition did not exist at the time of discovery that could have prevented the fulfillment of the HPCI steam line isolation safety function. The licensee notified the NRC Resident Inspector. Notified R1DO (Doerflein). |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+-1.95 h-0.0813 days <br />-0.0116 weeks <br />-0.00267 months <br />) | |
| Opened: | Mark Arnosky 01:13 Aug 28, 2009 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Oct 20, 2009 |
| 45307 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 506702014-12-11T14:45:00011 December 2014 14:45:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Secondary Containment Airlock Doors Opened Simultaneously ENS 497062014-01-09T16:35:0009 January 2014 16:35:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Entry Into & Exit from Technical Specification 3.6.5.1.1 Due to Open Air Lock Doors ENS 496592013-12-18T19:09:00018 December 2013 19:09:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Unit 2 Secondary Containment Integrity ENS 496512013-12-18T14:39:00018 December 2013 14:39:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Unit 1 Secondary Containment Integrity ENS 495262013-11-10T18:51:00010 November 2013 18:51:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Integrity Momentarily Declared Inoperable ENS 493182013-09-03T10:46:0003 September 2013 10:46:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Access Air Lock Doors Opened Simultaneously Resulting in Momentary Degradation ENS 483342012-09-21T20:00:00021 September 2012 20:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Isolation Valves Could Fail to Fully Close ENS 453072009-08-28T03:10:00028 August 2009 03:10:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Non-Conservative Technical Specification Setpoints Discovered 2014-12-11T14:45:00 | |