ML18278A038
| ML18278A038 | |
| Person / Time | |
|---|---|
| Site: | 07003103 |
| Issue date: | 10/01/2018 |
| From: | Cowne S Louisiana Energy Services, URENCO USA |
| To: | Document Control Desk, Office of Nuclear Material Safety and Safeguards |
| References | |
| LES-18-125-NRC | |
| Download: ML18278A038 (4) | |
Text
LES-18-125-NRC ATTN: Document Control Desk Director OCT O 1 2018 Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Louisiana Energy Services, LLC NRC Docket No. 70-3103
Subject:
10 CFR 70.50(c)(2), 30 Day Report On September 14, 2018, Louisiana Energy Services, d.b.a, URENCO USA (UUSA),
notified the NRC of planned corrective maintenance activities affecting the Criticality Accident Alarm System (CAAS). Event Notification 53604 details this occurrence.
As required by 10 CFR 70.50(c)(2), Enclosure 1 provides the written follow-up report within 30 days of the initial report.
If you have any questions, please contact Wyatt Padgett, Licensing and Performance Assessment Manager, at 575-394-5257.
Respectfully, n Cowne Nuclear Officer and Compliance Manager
Enclosures:
- 1) 10 CFR 70.50(c)(2) Report LES.PO Box 1789, Eunice, New Mexico 88231,USA T: +1 575 394 4646 F: +1 575 394 4545 W: www.urenco.com/LES
LES-18-116-NRC Cc:
U.S. Nuclear Regulatory Commission, Region II 245 Peachtree Center Avenue, NE.
Suite 1200 Atlanta, GA 30303-1257 RidsRgn2MailCenter@NRC.gov J. Keith Everly, Senior Program Manager U.S. Nuclear Regulatory Commission JKeith.Everly@NRC.gov Jacob Zimmerman, Enrichment & Conversion Branch Chief U.S. Nuclear Regulatory Commission Office of Nuclear Material Safety and Safeguards Jacob.Zimmerman@NRC.gov Karl Sturzebecher, Project Manager - UUSA U.S. Nuclear Regulatory Commission Karl.Sturzebecher@NRC.gov Omar Lopez-Santiago, Chief - Region II Projects Branch I U.S. Nuclear Regulatory Commission Omar. Lopez-Santiago@NRC.gov
LES-18-116-NRC 10 CFR 70.50(c)(2) Report 10 CFR 70.50(c)(1)
(i) The individual who facilitated the report EN53604 was Wyatt Padgett, Licensing and Performance Assessment Manager. The call-back telephone number for Wyatt Padgett is 575-394-5257.
(ii) The Report time was 11 :29 EST on September 14, 2018. The maintenance activities commenced on September 15, 2018 at approximately 09:30 EST. The location of this event was at URENCO USA in Eunice, New Mexico (Lea County). This event affected activities at the entire site. Populated areas were limited to the Security Alarm Station, Operations Control Room, and the Maintenance Area housing the CAAS control cabinets in the Technical Services Building (TSB).
(iii) The description of the event remains unchanged from the anticipated activities in the initial Event Notification reported in accordance with 10 CFR 70.50(b)(2).
The UUSA facility CAAS exists to detect and alarm in the unlikely event of a criticality accident, as required by 10 CFR 70.24, Criticality accident requirements. This monitoring system was temporarily disabled during planned corrective maintenance activities for approximately thirty minutes. This activity affected the CAAS in the Separations Building Module (SBM) 1001/1002 and the Cylinder Receipt and Dispatch Building (CRDB). The CAAS in the remaining portions of the facility was unaffected.
CAAS coverage of the populated areas was provided during the maintenance activity by temporary criticality detection equipment. Compensatory measures were implemented in accordance with section 3.1.5 of the UUSA Integrated Safety Analysis (ISA) Summary.
These measures, including evacuation of non-essential personnel from the areas of concern and the Immediate Evacuation Zone (IEZ) before removing the equipment from service, limiting access into facility, and restricting Special Nuclear Material (SNM) movement were implemented until CAAS coverage was verified operational.
The CAAS was returned to service on September 15, 2018 approximately fifteen minutes after maintenance activities commenced. UUSA notified the NRC once CAAS coverage was returned to normal operation.
(A) Radiation surveys were conducted prior to re-entry to confirm acceptable conditions in the area. During the maintenance period, no abnormal radiation readings were observed. No radiological or chemical hazards exist and no material was released.
(B) No health or safety consequences to workers or the public, or the environment exist.
No unexpected exposure or production of radioactive materials or hazardous chemicals occurred.
(C) The occurrence leading to this event was a defective fault detector card. The card was generating a fault indication with no associated fault code. There is a 2 digit 7
LES-18-116-NRC segment display that shows a number which corresponds to a specific fault. The card would go into alarm but was not resettable and did not show any specific code.
(D) At no time prior to maintenance were the detection capabilities lost. The control room always had the ability to manually activate the annunciation and keep out warning lights.
Upon discovery of the faulted card the annunciation and keep out warning lights were tested to confirm functionality.
(iv) No external conditions affected this event.
(v) Work order 100035517 4 was utilized to complete the replacement of the fault detector card in accordance with manufacturer's recommendations. Event Report 126823 was created in the UUSA corrective action program for information purposes and tracking of regulatory responsibilities. No additional actions have been taken in response to this event.
(vi) This event has been terminated. The fault detector card for the CAAS has been replaced. Functional test(s) were performed to verify adequate repair. The CAAS has been returned to normal operating condition.
(vii) No change in site emergency status occurred or will occur in response to this event.
(viii) No notifications to local, State, or Federal agencies occurred or will occur for this event.
(ix) No press releases were made and no press releases are planned.
(ii) The probable cause of the event, as stated, was a defective fault detector card.
Item description: Board, Fault Detector Card Manufacturer part number: 99-02-0699-001, PSC (iii) Work order 100035517 4 was utilized to complete the replacement of the fault detector card in accordance with manufacturer's recommendations. Event Report 126823 was created in the UUSA corrective action program for information purposes and tracking of regulatory responsibilities.
(iv) Compensatory measures were implemented in accordance with section 3.1.5 of the UUSA Integrated Safety Analysis (ISA) Summary.