ML12220A393: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
 
(Created page by program invented by StriderTol)
Line 13: Line 13:
| page count = 4
| page count = 4
}}
}}
=Text=
{{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY COMMISSION REGION III 2443 WARRENVILLE ROAD, SUITE 210 LISLE, IL 60532
-4352  August 6, 2012 Mr. Michael J. Pacil i o Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL  60555
==SUBJECT:==
ASSESSMENT FOLLOW-UP LETTER FOR BRAIDWOOD STATION UNIT 2 
==Dear Mr. Paci l i o:==
As a result of our quarterly review of plant performance, which was completed on July 31, 2012 , the NRC updated its assessment of Braidwood Station Unit 2. The NRC's evaluation consisted of a review of performance indicators and inspection results. This letter informs you of the NRC's assessment of Braidwood Station Unit 2 and its plans for a future inspection at your facility. This letter supplements, but does not supersede, the annual assessment letter issued on March 5, 2012 (ADAMS A ccession No. ML12065A102
).
The NRC's review of Braidwood Unit 2 identified that the Mitigating System Performance Index for the Cooling Water Support System has crossed th e Green-to-White threshold. This was due to probabilistic risk assessment model change errors, operating restrictions on the cooling water support system, and equipment failures.
The NRC determined the performance at Braidwood Station Unit 2 to be in the Regulatory Response Column of the Reactor Oversight Process Action Matrix beginning in the second quarter of 2012 based on the PI data report ed to the NRC.
Therefore, the NRC plans to conduct a supplemental inspection in accordance with Inspection Procedure 9500 1 , "Supplemental Inspection for One or Two White Inputs in a Strategic Performance Area," to provide assurance that the root causes and contributing causes of risk-significant performance issues are understood, that the extent of condition and cause is identified, and to ensure the licensee's corrective actions for risk
-significant performance issues are sufficient to address the root and contributing causes and prevent recurrence.
The NRC requests that your staff provide notification of your readiness for the NRC to conduct this supplemental inspection.
M. Pacilio In accordance with 10 CFR 2.390 of the NRC
=s ARules of Practice,@ 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 NRC's 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).
Please contact Eric Duncan a t 6 30-829-9620 with any questions you may have regarding this letter. Sincerely,  /RA/  Gary L. Shear , Acting Director Division of Reactor Projects
Docket No.
50-45 7 License No.
NPF-77  cc:  Distribution via ListServ TM M. Pacilio In accordance with 10 CFR 2.390 of the NRC
=s ARules of Practice,@ 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 NRC's 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).
Please contact Eric Duncan at 630-829-9620 with any questions you may have regarding this letter. Sincerely, 
/RA/ Gary L. Shear, Acting Director Division of Reactor Projects Docket No.
50-45 7 License No.
NPF-77  cc:  Distribution via ListServ TM                DOCUMENT NAME:
G:\DRPIII\BRAI\Braidwood Assessment Follow
-up Letter
- White PI.docx Publicly Available Non-Publicly Available Sensitive  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  RIII  NAME RNg:dtp EDuncan DPassehl JLara GShear DATE 08/03/12 08/03/12 08/06/12 08/06/12 08/06/12 OFFICIAL RECORD COPY
Letter to M. Pacilio from G. Shear dated August 6, 2012.
==SUBJECT:==
ASSESSMENT FOLLOW
-UP LETTER FOR BRAIDWOOD STATION UNIT 2  DISTRIBUTION
: Silas Kennedy RidsNrrDorlLpl3
-2 Resource RidsNrrPMBraidwood Resource RidsNrrDirsIrib Resource Chuck Casto Cynthia Pederson Steven Orth Jared Heck Allan Barker DRPIII DRSIII Carole Ariano Linda Linn Patricia Buckley Tammy Tomczak ROPreports.Resource@nrc.gov}}

Revision as of 23:20, 1 August 2018

Braidwood Unit 2 Assessment Follow-Up Letter
ML12220A393
Person / Time
Site: Braidwood Constellation icon.png
Issue date: 08/07/2012
From: Shear G L
Division Reactor Projects III
To: Pacilio M J
Exelon Generation Co
References
Download: ML12220A393 (4)
v • d • e


Text

UNITED STATES NUCLEAR REGULATORY COMMISSION REGION III 2443 WARRENVILLE ROAD, SUITE 210 LISLE, IL 60532

-4352 August 6, 2012 Mr. Michael J. Pacil i o Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

ASSESSMENT FOLLOW-UP LETTER FOR BRAIDWOOD STATION UNIT 2

Dear Mr. Paci l i o:

As a result of our quarterly review of plant performance, which was completed on July 31, 2012 , the NRC updated its assessment of Braidwood Station Unit 2. The NRC's evaluation consisted of a review of performance indicators and inspection results. This letter informs you of the NRC's assessment of Braidwood Station Unit 2 and its plans for a future inspection at your facility. This letter supplements, but does not supersede, the annual assessment letter issued on March 5, 2012 (ADAMS A ccession No. ML12065A102

).

The NRC's review of Braidwood Unit 2 identified that the Mitigating System Performance Index for the Cooling Water Support System has crossed th e Green-to-White threshold. This was due to probabilistic risk assessment model change errors, operating restrictions on the cooling water support system, and equipment failures.

The NRC determined the performance at Braidwood Station Unit 2 to be in the Regulatory Response Column of the Reactor Oversight Process Action Matrix beginning in the second quarter of 2012 based on the PI data report ed to the NRC.

Therefore, the NRC plans to conduct a supplemental inspection in accordance with Inspection Procedure 9500 1 , "Supplemental Inspection for One or Two White Inputs in a Strategic Performance Area," to provide assurance that the root causes and contributing causes of risk-significant performance issues are understood, that the extent of condition and cause is identified, and to ensure the licensee's corrective actions for risk

-significant performance issues are sufficient to address the root and contributing causes and prevent recurrence.

The NRC requests that your staff provide notification of your readiness for the NRC to conduct this supplemental inspection.

M. Pacilio In accordance with 10 CFR 2.390 of the NRC

=s ARules of Practice,@ 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 NRC's 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).

Please contact Eric Duncan a t 6 30-829-9620 with any questions you may have regarding this letter. Sincerely, /RA/ Gary L. Shear , Acting Director Division of Reactor Projects

Docket No.

50-45 7 License No.

NPF-77 cc: Distribution via ListServ TM M. Pacilio In accordance with 10 CFR 2.390 of the NRC

=s ARules of Practice,@ 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 NRC's 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).

Please contact Eric Duncan at 630-829-9620 with any questions you may have regarding this letter. Sincerely,

/RA/ Gary L. Shear, Acting Director Division of Reactor Projects Docket No.

50-45 7 License No.

NPF-77 cc: Distribution via ListServ TM DOCUMENT NAME:

G:\DRPIII\BRAI\Braidwood Assessment Follow

-up Letter

- White PI.docx Publicly Available Non-Publicly Available Sensitive 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 RIII NAME RNg:dtp EDuncan DPassehl JLara GShear DATE 08/03/12 08/03/12 08/06/12 08/06/12 08/06/12 OFFICIAL RECORD COPY

Letter to M. Pacilio from G. Shear dated August 6, 2012.

SUBJECT:

ASSESSMENT FOLLOW

-UP LETTER FOR BRAIDWOOD STATION UNIT 2 DISTRIBUTION

Silas Kennedy RidsNrrDorlLpl3

-2 Resource RidsNrrPMBraidwood Resource RidsNrrDirsIrib Resource Chuck Casto Cynthia Pederson Steven Orth Jared Heck Allan Barker DRPIII DRSIII Carole Ariano Linda Linn Patricia Buckley Tammy Tomczak ROPreports.Resource@nrc.gov

Retrieved from "https://kanterella.com/w/index.php?title=ML12220A393&oldid=933330"