ENS 51473
ENS Event | |
|---|---|
17:20 Oct 14, 2015 | |
| Title | Two Containment Isolation Valves Not Properly Tested Per Technical Specifications |
| Event Description | At 1220 CDT on October 14, 2015, GGNS identified that in June 2013, testing of two containment isolation valves in a penetration were not tested in accordance with Technical Specification Surveillance Requirement 3.6.1.3.9. Specifically, the pressure used to demonstrate operability of the penetration did not meet the post-Extended Power Uprate expected highest Containment pressure during an accident.
The valves were declared inoperable and isolated in accordance with Technical Specification 3.6.1.3, Primary Containment Isolation Valves (PCIVs) . Even though a reasonable assurance that the safety function could be met existed based on previous analysis and testing, the containment penetration was declared inoperable until appropriate testing could be completed to demonstrate operability. Testing of the penetration was completed at 1101 CDT on October 15, 2015 and demonstrated that both penetration valves were operable at the higher test pressure for the entire time period between June 2013 and October 15, 2015. In accordance with NUREG-1022, Event Reporting Guidelines 10 CFR 50.72 and 50.73, Section 3.2.7, Event or Condition that Could Have Prevented Fulfillment of a Safety Function, requires that when a signal train system is declared inoperable the condition must be reported under 10CFR 50.72(b)(3)(v)(C). The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+28.7 h1.196 days <br />0.171 weeks <br />0.0393 months <br />) | |
| Opened: | Sean Dunfee 22:02 Oct 15, 2015 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Oct 15, 2015 |
| 51473 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |