ML102100137
| ML102100137 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/29/2010 |
| From: | Nick Hilton NRC/OE |
| To: | Calvert Cliffs |
| Coleman, N. OE, 301-415-1048 | |
| References | |
| EA-10-080, EN-10-032 | |
| Download: ML102100137 (3) | |
Text
July 29, 2010 EN 10-032 OFFICE OF ENFORCEMENT NOTIFICATION OF SIGNIFICANT ENFORCEMENT ACTION Licensee:
Calvert Cliffs Nuclear Power Plant EA-10-080 Calvert Cliffs Unit 2 Docket No. 50-318
Subject:
ISSUANCE OF FINAL SIGNIFICANCE DETERMINATION AND NOTICE OF VIOLATION This is to inform the Commission that a Notice of Violation associated with a White Significance Determination Process (SDP) finding will be issued on or about August 3, 2010, to Calvert Cliffs Nuclear Power Plant (Licensee), as a result of the failure to develop and implement scheduled preventative maintenance for safety-related Agastat E7000 series time delay relays that are used in the protective logic for the 2B Emergency Diesel Generator (EDG). This resulted in a failure of the time delay relay which caused the 2B EDG to trip when called upon to energize the 24.4 kV safety bus during an event on February 18, 2010.
The licensee chose not to attend a Regulatory Conference nor provide a written response to the NRC preliminary determination; however, they provided a letter to the NRC acknowledging the characterization of the risk significance of this finding. After considering the information developed during the inspections, and having assessed the finding using the reactor safety significance determination process, the NRC has concluded that the finding is appropriately characterized as White.
A Notice of Violation is included based on the licensees failure to meet Technical Specifications 5.4.1, which requires, in part, that procedures shall be established, implemented, and maintained covering the applicable procedures recommended in Regulatory Guide 1.33. Regulatory Guide 1.33, states, in part, that preventative maintenance schedules should be developed to specify inspection or replacement of parts that have a specific lifetime. Contrary to this requirement, the Licensee failed to replace safety-related relays used in the 2B EDG protective logic within the vendor-recommended 10-year lifetime, nor did the Licensee establish a performance monitoring program. This resulted in the relay timing out early, failing to support a demand fast start and run of the 2B EDG. This resulted in the EDG becoming inoperable with the resultant loss of alternating current to the 24 safeguards bus during the dual unit trip that occurred on February 18, 2010.
The NRC considered citing a violation for the EDG being inoperable for a time in excess of the allowed outage time specified in the Technical Specifications. However, the NRC decided to cite the violation related to deficiencies in the Licensees performance monitoring and maintenance activities, because this violation most appropriately captures the deficiencies that directly contributed to the EDG inoperability.
It should be noted that the licensee has not been specifically informed of the enforcement action.
The schedule of issuance and notification is:
Mailing of Final Significance Determination August 3, 2010 Telephone Notification of Licensee August 3, 2010 The State of Maryland will be notified.
Contacts:
Nicole Coleman, OE, (301) 415-1048 Nick Hilton, OE, (301) 415-3055
Distribution: EN-10-032, July 29, 2010 OWFN Chairman Jaczko Comm. Svinicki Comm. Apostolakis Comm. Magwood Comm. Ostendorff SECY OCA PA IP OWFN EDO DEDR DEDMRS OE OGC NRR NSIR OI TWFN OCFO OP CENTER FSME OIG OCIO RES ACRS EBB NMSS Regional Offices RI RII RIII RIV MAIL ADAMS OE staff Electronic DISTRIBUTION:
R. Zimmerman, OE N. Hilton, OE N. Coleman, OE OE r/f EN binder ADAMS ML102100137 PUBLICLY AVAILABLE NON-SENSITIVE OFFICE OE:ES OE:BC NAME N. Coleman R. Summers for N. Hilton DATE 7/22/2010 7/29/2010 OFFICIAL RECORD COPY