ML113070652
| ML113070652 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 11/09/2011 |
| From: | John Hughey Plant Licensing Branch 1 |
| To: | Pacilio M Exelon Generation Co |
| Hughey J, NRR/DORL, 301-415-3204 | |
| References | |
| TAC ME6348, TAC ME6349 | |
| Download: ML113070652 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 November 9, 2011 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville,IL 60555
SUBJECT:
LIMERICK GENERATING STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST FOR REACTOR ANOMALIES SURVEILLANCE REQUIREMENT (TAC NOS. ME6348 AND ME6349)
Dear Mr. Pacilio:
By letter to the Nuclear Regulatory Commission (NRC) dated June 2, 2011,1 Exelon Generation Company, LLC, submitted a license amendment request for Limerick Generating Station (LGS),
Units 1 and 2. The proposed change would revise the Technical Specifications for each unit by changing the method of calculating core reactivity for the purpose of performing the reactivity anomaly surveillance at LGS, Units 1 and 2. The NRC staff has reviewed the request submitted by the licensee and determined that additional information is needed as set forth in the Enclosure.
The draft questions were sent to Mr. Thomas Loomis, of your staff, to ensure that the questions were understandable, the regulatory basis for the questions was clear, and to determine if the information was previously docketed. On November 3, 2011, Mr. Loomis indicated that the licensee will submit a response by December 9, 2011. Please note that if you do not respond to this letter by the agreed-upon date or provide an acceptable alternate date in writing, we may reject your application for amendment under the provisions of Title 10 of the Code of Federal Regulations, Section 2.108.
It you have any questions, please contact John Hughey at (301) 415-3204.
sindi?o.~
..Co~Ughey, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-352 and 50-353
Enclosure:
Request for Additional Information cc: Distribution via ListServ I Agencywide Documents Access and Management System Accession No. ML111540120.
REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR TECHNICAL SPECIFICATION CHANGES TO SECTION 3/4.1.2, "REACTOR ANOMALIES" LIMERICK GENERATING STATION - UNITS 1 AND 2 DOCKET NOS. 50-352 AND 50-353 By letter to the Nuclear Regulatory Commission (NRC) dated June 2, 2011,1 Exelon Generation Company, LLC, (Exelon) submitted a license amendment request for Limerick Generating Station (LGS), Units 1 and 2. The proposed change would revise the Technical Specifications for each unit by changing the method of calculating core reactivity for the purpose of performing the reactivity anomaly surveillance at LGS, Units 1 and 2. The proposed change would allow performance of the surveillance based on a comparison of predicted to actual (or monitored) core reactivity. The reactivity anomaly verification is currently determined by a comparison of predicted versus actual control rod density. The NRC staff has reviewed Exelon's submittal and determined that additional information, as described below, is needed to complete the review.
RAI-01
It is implied (but not directly stated) in the licensee's amendment request that PANAC11 is the 3D core simulator code currently used in determination of the predicted core k-effective value. The k-effective value is used to generate the predicted reactivity anomaly curves. Please confirm that PANAC11 is the 3D core simulator code currently used to perform this calculation.
RAI-02
In Attachment 2, "Markup of Technical Specifications and Bases Pages," of the licensee's amendment request, the suggested change to Surveillance Requirement (SR) 4.1.2 does not retain the 1 % delta-k/k comparison criterion that is present in the original version of the SR. Comparison criterion is important in determining whether or not the SR is met. Please explain why the 1 % delta-klk comparison criterion was omitted from the SR markup.
! Agencywide Documents Access and Management System Accession No. ML111540120.
Enclosure
- via e-mail OFFICE LPL 1-2/PM LPL1-2/LA SNPB/BC LPL1-2/BC NAME JHughey ABaxter
- AMendiola (MPanicker for)
HChernoff (REnnis for)
DATE 11/08/2011 11/08/2011 11/08/2011 11/09/2011