ML063120257
| ML063120257 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 11/08/2006 |
| From: | Satorius M Division Reactor Projects III |
| To: | Crane C Exelon Generation Co, Exelon Nuclear |
| References | |
| MSIV-2-203-1A | |
| Download: ML063120257 (4) | |
Text
November 8, 2006 Mr. Christopher M. Crane President and Chief Nuclear Officer Exelon Nuclear Exelon Generation Company. LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
ASSESSMENT FOLLOW-UP LETTER - DRESDEN NUCLEAR POWER STATION, UNIT 2
Dear Mr. Crane:
On October 30, 2006, the NRC staff completed, as part of our quarterly review, an update of our assessment of the Dresden Nuclear Power Station. The assessment evaluated performance indicators (PIs) and inspection results. The purpose of this letter is to inform you of your safety performance during this period and our plans for a future inspection at your facility. This letter supplements, but does not supercede, our mid-cycle assessment letter issued on August 31, 2006.
Our review of Dresden Nuclear Power Station Unit 2 identified that you have crossed the threshold from GREEN to WHITE for the Scrams With Loss of Normal Heat Removal performance indicator. On July 4, 2006, Unit 2 experienced a reactor scram caused by the inboard main steam isolation valve (MSIV), 2-203-1A, drifting closed. This resulted in the indicator value for the Scrams With Loss of Normal Heat Removal PI to become 3.0 and the PI to become WHITE. The threshold for this PI is: White > 2.0, Yellow > 10.0, Red > 20.0.
As a result, we have assessed Dresden Unit 2 performance to be in the Regulatory Response Column of the NRCs Action Matrix. Therefore, we plan to conduct Inspection Procedure (IP) 95001, Inspection for One or Two White Inputs in a Strategic Performance Area, during the first quarter of 2007. This inspection procedure is conducted to provide assurance that the root cause and contributing causes of risk significant performance issues are understood, the extent of condition is identified, and the corrective actions are sufficient to prevent recurrence.
The IP 95001 inspection will be conducted in addition to the baseline inspections currently scheduled. The time frame for the inspection was selected based on communications between your Dresden Regulatory Assurance staff and our Dresden Resident Inspection Office on November 6, 2006, indicating that your corrective actions were sufficiently complete to support the inspection, and in consideration of your planned outages on Units 3 and 2, respectively.
In accordance with 10 CFR 2.390 of the NRCs Rules and Practices, a copy of this letter will be made available electronically for public inspection in the NRC Public Document Room or from the Publicly Available Records (PARS) component of NRCs document system (ADAMS).
ADAMS is accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).
C. Crane If circumstances arise which cause us to change the inspection plan, we will contact you to discuss the change as soon as possible. Please contact Mark Ring, Chief, Reactor Projects Branch 1 at 630-829-9703 with any questions you may have regarding this letter.
Sincerely,
/RA/
Mark A. Satorius, Director Division of Reactor Projects Region III Docket No. 50-237 License No. NPF-19 cc w/encl:
Site Vice President - Dresden Nuclear Power Station Dresden Nuclear Power Station Plant Manager Regulatory Assurance Manager - Dresden Chief Operating Officer Senior Vice President - Nuclear Services Senior Vice President - Mid-West Regional Operating Group Vice President - Mid-West Operations Support Vice President - Licensing and Regulatory Affairs Director Licensing - Mid-West Regional Operating Group Manager Licensing - Dresden and Quad Cities Senior Counsel, Nuclear, Mid-West Regional Operating Group Document Control Desk - Licensing Assistant Attorney General Illinois Emergency Management Agency State Liaison Officer Chairman, Illinois Commerce Commission
C. Crane If circumstances arise which cause us to change the inspection plan, we will contact you to discuss the change as soon as possible. Please contact Mark Ring, Chief, Reactor Projects Branch 1 at 630-829-9703 with any questions you may have regarding this letter.
Sincerely,
/RA/
Mark A. Satorius, Director Division of Reactor Projects Region III Docket No. 50-237 License No. NPF-19 cc w/encl:
Site Vice President - Dresden Nuclear Power Station Dresden Nuclear Power Station Plant Manager Regulatory Assurance Manager - Dresden Chief Operating Officer Senior Vice President - Nuclear Services Senior Vice President - Mid-West Regional Operating Group Vice President - Mid-West Operations Support Vice President - Licensing and Regulatory Affairs Director Licensing - Mid-West Regional Operating Group Manager Licensing - Dresden and Quad Cities Senior Counsel, Nuclear, Mid-West Regional Operating Group Document Control Desk - Licensing Assistant Attorney General Illinois Emergency Management Agency State Liaison Officer Chairman, Illinois Commerce Commission DOCUMENT NAME:C:\\FileNet\\ML063120257.wpd G Publicly Available G Non-Publicly Available G Sensitive G Non-Sensitive To receive a copy of this document, indicate in the concurrence box "C" = Copy without attach/encl "E" = Copy with attach/encl "N" = No copy OFFICE RIII RIII RIII RIII NAME MSatorius
/ ABarker for/ MRing DATE 11/08/06 11/07/06 OFFICIAL RECORD COPY
C. Crane DISTRIBUTION:
TEB JXH11 RidsNrrDirsIrib GEG KGO GLS DRC1 CAA1 LSL (electronic IRs only)
C. Pederson, DRS (hard copy - IRs only)
DRPIII DRSIII PLB1 TXN ROPreports@nrc.gov (inspection reports, final SDP letters, any letter with an IR number)