ML070330083
| ML070330083 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 02/02/2007 |
| From: | Dave Solorio, Starkey R NRC/OE |
| To: | |
| Starkey D | |
| References | |
| EA-06-291 EN-07-005 | |
| Download: ML070330083 (2) | |
Text
PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION February 2, 2007 EN-07-005 OFFICE OF ENFORCEMENT NOTIFICATION OF SIGNIFICANT ENFORCEMENT ACTION Licensee:
Exelon Generation Company, LLC (EA-06-291)
Clinton Power Station Docket No. 05000461
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 finding will be issued on or around February 7, 2007, to Exelon Generation Company, LLC, as a result of inspections at the Clinton Power Station. This White finding, an issue of low to moderate safety significance which may require additional U.S. Nuclear Regulatory Commission inspection, involved the licensees failure to select an appropriate method for calculating the minimum elevation (i.e., the analytical level) of water above the high pressure core spray (HPCS) pump suction line to preclude vortex formation and subsequent air entrainment in the pumps suction. As a result, the analytical level would result in significant air entrainment potentially causing the HPCS to be incapable of completing its safety function.
A Notice of Violation is included based on a violation of 10 CFR 50, Appendix B, Criteria III, Design Control. Prior to August 12, 2006, the licensee had not ensured the adequacy of design of the HPCS system by performance of design reviews or by use of alternate or simplified calculational methods. Specifically, the initiation of suction swap-over from the reactor core isolation cooling tank to the suppression pool, a controlling parameter to ensure continued function of the HPCS pump, was required to occur at 740.19 feet. However, this calculated value would not have prevented significant air entrainment in the suction of the HPCS pump and subsequent loss of function of the HPCS pump.
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 February 7, 2007 Telephone Notification of Licensee February 7, 2007 The State of Illinois will be notified.
Contacts: Doug Starkey, OE, 301-415-3456 David Solorio, OE, 301-415-2741
PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION Electronic Distribution: EN-07-005, February 2, 2007 OWFN Chairman Klein Comm. McGaffigan Comm. Merrifield Comm. Jaczko Comm. Lyons SECY OCA PA IP OWFN DO DEDR DEDMRS OE OGC NRR NSIR OI STP TWFN OCFO OP CENTER NMSS OIG OCIO RES ACRS Regional Offices RI RII RIII RIV MAIL PUBLIC OE staff DISTRIBUTION: (Hard copy)
C. Carpenter, OE M. Fahey, OE D. Starkey D. Solorio OE r/f EA-06-291 File EN binder ADAMS ACCESSION ML070330083 File Name: G:\\OECASES\\ENs\\2007 Ens\\EN-07-005 Clinton.drs.wpd X Publicly Available G Non-Publicly Available G Sensitive X Non-Sensitive OE:ES OE:SC DStarkey DSolorio 02/02/07 02/02/07