ENS Event | |
|---|---|
17:08 Apr 13, 2018 | |
| Title | Two Cracks Identified at the Feed Water Line 'B' Containment Concrete Penetration |
| Event Description | At 1208 CDT on April 13, 2018, GGNS [Grand Gulf Nuclear Station] identified cracks in the primary containment concrete penetration [outer wall] around feed water line 'B'. There are no available dimensions for crack width or depth until further inspections are performed.
In accordance with NUREG 1022, Event Reporting Guidelines 10 CFR 50.72 and 10 CFR 50.73, Section 3.2.4, any event or condition that results in the condition of the nuclear power plant, including its principal safety barriers being seriously degraded, requires that when a principal safety barrier is declared inoperable the condition must be reported under 10 CFR 50.72 (b)(3)(ii). The licensee has notified the NRC Resident Inspector.
Grand Gulf Nuclear Station (GGNS) personnel performed an inspection of the wall around feed water line 'B'. This inspection included the protective coating in the identified area and a partial inspection of the underlying concrete. The inspection of the protective coating found a collection of non-linear anomalies, chipping, and flaking. The inspection found non-significant linear indications in the concrete. Grand Gulf Nuclear Station determined that the collection of non-significant coating imperfections and non-significant indications in the concrete do not constitute serious degradation of primary containment. The indications do not adversely impact the operability, mission time, or safety-function (as described per Technical Specification 3.6.1.1, Primary Containment) of the containment structure. The as-found conditions have been entered into the GGNS corrective action program for final disposition. The containment structure is operable, therefore, GGNS is retracting this event notification. The licensee has notified the NRC Resident Inspector. Notified R4DO (Kellar). |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
| Time - Person (Reporting Time:+3.93 h0.164 days <br />0.0234 weeks <br />0.00538 months <br />) | |
| Opened: | Brandon Starnes 21:04 Apr 13, 2018 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Apr 15, 2018 |
| 53335 - NRC Website
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WEEKMONTHYEARENS 533352018-04-13T17:08:00013 April 2018 17:08:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Two Cracks Identified at the Feed Water Line 'B' Containment Concrete Penetration ENS 478802012-04-30T23:01:00030 April 2012 23:01:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Weld Defect Indication Found in Residual Heat Removal System to Reactor Pressure Vessel Nozzle 2018-04-13T17:08:00 | |