05000416/LER-2017-005
| 9-7-2017 | On July 9, 2017, at approximately 2158 hours0.025 days <br />0.599 hours <br />0.00357 weeks <br />8.21119e-4 months <br /> central daylight time a pressure boundary door to the Control Room Envelope was left unsecure. The Control Room Envelope was inoperable for approximately one minute, at which time the door was closed. Grand Gulf Nuclear Station personnel identified that a loss of Safety Function occurred due to a breach in the Control Room Envelope resulting in inoperability of both divisions of Standby Fresh Air. This event is being reported under 10CFR 50.72(a)(2)(v)(D), as any event or condition that, at the time of discovery, could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. The cause was determined to be that the organization failed to understand the nuclear safety consequence associated with a degraded condition of door SZ1000516 and failed to implement a mitigating strategy. Corrective actions included restoration of the door to operable status and coaching of the responsible individual.
Future corrective action will include implementation of a maintenance strategy for control room pressure boundary doors to ensure reliable operation. There were no nuclear safety consequences or radiological consequences as a result of this event. (4-2017) 366A U.S. NUCLEAR REGULATORY COMMISSION ContentsCONTINUATION SHEET(See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.qovireading-rm/doc-collectionsinureasistaff/sr1 0221r31) APPROVED BY OMB: NO. 3150-0104 EXPIRES: 3/31/2020 Reported lessons learned are incorporated into the licensing process and fed back to industry. Send comments regarding burden estimate to the Information Services Branch (T-2 F43), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocoilects.Resource@nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs. NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection. 2. DOCKET 3. LER NUMBER 05000 416 DESCRIPTIONOn July 9, 2017, at approximately 2158 hours0.025 days <br />0.599 hours <br />0.00357 weeks <br />8.21119e-4 months <br /> central daylight time a pressure boundary door to the Control Room Envelope [NA] was left unsecure. The Control Room Envelope was inoperable for approximately one minute, at which time the door was closed. Grand Gulf Nuclear Station personnel identified that a loss of Safety Function occurred due to a breach in the Control Room Envelope resulting in inoperability of both divisions of Standby Fresh Air systems. REPORTABILITYThis event is being reported under 10CFR50.73(a)(2)(v)(D), as any event or condition that, at the time of discovery, could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. CAUSEThe direct cause of the event was that the door was degraded, resulting in the door dragging on the floor such that the automatic door closer would not function properly. The organization failed to understand the nuclear safety consequence associated with the degraded condition and failed to implement a mitigating strategy. CORRECTIVE ACTIONSImmediate Corrective Actions:Upon identification the door was immediately secured and the Control Room Supervisor was notified. The event was entered into the Grand Gulf Nuclear Station corrective action program. Grand Gulf Nuclear Station Security personnel provided immediate coaching to the employee who left the door open. The support hinge bushing was replaced, restoring normal door closure. Corrective Actions To Prevent Recurrence: Implement a maintenance strategy for doors SZ1000715, Passageway Door; SZ1000708, Corridor Door; SZ1000612, Corridor No. 3 Door; SZ1000516, Corridor Door. NRC FORM(6-2016) nec.,„..., 366A U.S. NUCLEAR REGULATORY COMMISSION CONTINUATION SHEET(See NUREG-1022, R.3 for instruction and guidance for completing this form htlp://www.nrc.novireading-rm/doc-collections/nurecis/staff/sr1022/r3/) APPROVED BY OMB: NO. 3150-0104 EXPIRES: 3/31/2020
Washington, DC 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection. 2. DOCKET 3. LER NUMBER 05000 416 SAFETY SIGNIFICANCEThere were no nuclear safety consequences or radiological consequences as a result of this event. No Technical Specification Safety Limits were violated. PREVIOUS SIMILAR OCCURRENCESThe identified licensee event reports were reviewed and it has been determined that the causes and corrective actions for the previously identified events were sufficiently different that they could not have predicted or prevented the occurrence of this event. |
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| Grand Gulf Nuclear Station, Unit 1 | |
| Event date: | 7-9-2017 |
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| Report date: | 9-7-2017 |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident |
| 4162017005R00 - NRC Website | |
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