ML120660210
| ML120660210 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 03/12/2012 |
| From: | John Hughey Plant Licensing Branch 1 |
| To: | Pacilio M Exelon Generation Co |
| Hughey J, NRR/DORL, 301-415-3204 | |
| References | |
| TAC ME7538, TAC ME7539 | |
| Download: ML120660210 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 March 12, 2012 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST FOR USE OF NEUTRON ABSORBING INSERTS IN UNITS 2 AND 3 SPENT FUEL POOL STORAGE RACKS (TAC NOS. ME7538 AND ME7539)
Dear Mr. Pacilio:
By letter to the Nuclear Regulatory Commission (NRC) dated November 3,2011,1 as supplemented on December 22,2011,2 Exelon Generation Company, LLC, submitted a license amendment request for Peach Bottom Atomic Power Station, Units 2 and 3. The submittal seeks to modify the Technical Specifications to include the use of neutron absorbing spent fuel pool rack inserts for the purpose of criticality control in the spent fuel pools. 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 March 2, 2012, Mr. Loomis indicated that the licensee will submit a response by April 6, 2012. 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.
If you have any questions, please contact John Hughey at (301) 415-3204.
P'£)~
John D. Hughey, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-277 and 50-278
Enclosure:
Request for Additional Information cc: Distribution via ListServ 1 Agencywide Documents Access and Management System (ADAMS) Accession No. M L 113081441.
2 ADAMS Accession No. ML113570208.
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- 1< LICENSE AMENDMENT REQUEST FOR TECHNICAL SPECIFICATION CHANGES USE OF NUETRON ABSORBING SPENT FUEL POOL RACK INSERTS EXELON GENERATION COMPANY, LLC PSEG NUCLEAR, LLC PEACH BOTTOM ATOMIC POWER STATION - UNITS 2 AND 3 DOCKET NOS. 50-277 AND 50-278 By letter to the Nuclear Regulatory Commission (NRC) dated November 3, 2011,1 as supplemented on December 22,2011,2 Exelon Generation Company, LLC, (Exelon) submitted a License Amendment Request (LAR) for Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3. The proposed amendment would modify the Technical Specifications (TS) to include the use of neutron absorbing spent fuel pool (SFP) rack inserts for the purpose of criticality control in the SFPs at PBAPS, Units 2 and 3. The NRC staff has reviewed Exelon's submittal and determined that additional information, as described below, is needed to complete the review.
RAI-06
Please confirm that the qualification testing acceptance criterion for the manufactured panels is greater than 0.0105 g/cm2 given that the qualification testing acceptance criteria is listed as greater than 0.0087g/cm2 on page 3-5 of NET-259-03 Rev 5 (Attachment 5 of the LAR dated November 3, 2011).
RAI-07
Please describe how the 2 rack inserts are selected that will be visually inspected during each insert in-situ inspection per Section 3.9.4.1 of Attachment 1 of the LAR.
How will these 2 rack inserts be representative of all inserts in the SFP?
RAI-08
Please clarify whether the insert that will be removed and inspected every 10 years (per Section 3.9.4.2 of Attachment 1 of the LAR) will be re-inserted in the racks, and how the one rack insert selected is going to be representative of all the inserts in the SFP.
Page 15 of Attachment 1 and page 4-6 of Attachment 5 of the LAR describes an estimated stress relaxation of 50% over 20 years of service for the insert material.
RAI-09.1: Please describe how stress relaxation of the inserts will be monitored and the frequency of monitoring. What are the acceptance criteria for stress relaxation?
Describe the maximum amount of stress relaxation allowable.
1 Agencywide Documents Access and Management System (ADAMS) Accession No. ML113081441.
2 ADAMS Accession No. ML113570208.
Enclosure
- 2 RAI-09.2: Please provide the data and justification of the data extrapolation that determined that over 20 years of service would be an estimated 50% stress relaxation.
RAI-10
Please discuss whether the data from the fast start coupon surveillance program at LaSalle (described in Section 3.9.2 of Attachment 1 of the LAR) can be used to inform the use of the Peach Bottom inserts given that the SFP environments may not be identical. Please provide the results of this program.
RAI-11
Will the coupons be re-inserted into the SFP after being inspected?
RAI-12
Page 19 of Attachment 1 of the LAR indicates that the areal density will only be measured on select coupons. Please discuss why the areal density measurement is only performed on select coupons as opposed to all of the coupons.
During the insert installation period, storage cells without inserts will be placed into three categories as described in the proposed license condition associated with the LAR. The determination of categories relies on the minimum panel Boron-10 areal density of the Boraflex in the storage cell.
RAI-13.1: Given that all the inserts may not be installed until 2016, what is the frequency for performing RACKLIFE predictions?
RAI-13.2: Given that all the inserts may not be installed until 2016, what is the frequency and sample size of the BADGER measurements?
March 12, 2012 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST FOR USE OF NEUTRON ABSORBING INSERTS IN UNITS 2 AND 3 SPENT FUEL POOL STORAGE RACKS (TAC NOS. ME7538 AND ME7539)
Dear Mr. Pacilio:
By letter to the Nuclear Regulatory Commission (NRC) dated November 3, 2011,1 as supplemented on December 22,2011,2 Exelon Generation Company, LLC, submitted a license amendment request for Peach Bottom Atomic Power Station, Units 2 and 3. The submittal seeks to modify the Technical Specifications to include the use of neutron absorbing spent fuel pool rack inserts for the purpose of criticality control in the spent fuel pools. 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 March 2,2012, Mr. Loomis indicated that the licensee will submit a response by April 6, 2012. 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 ofFederal Regulations, Section 2.108.
If you have any questions, please contact John Hughey at (301) 415-3204.
Sincerely, IRA!
John D. Hughey, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-277 and 50-278
Enclosure:
Request for Additional Information cc: Distribution via ListServ DISTRIBUTION:
RidsNrrPMPeaehBottomResouree RidsNrrLAABaxterResouree RidsNrrDeEsgbResouree RidsRgn 1 MailCenterResou ree RidsNrrDorlLpl1-2Resouree EWong, NRR RidsOgeRpResouree PUBLIC RidsAersAenw MailCTRResouree LPLI-2 RtF AObodoako, NRR RidsNrrDorlDprResouree ADAMS Accession No*.. ML120660210
- via memo dated OFFICE LPL 1-2/PM LPL 1-2/LA ESGB/BC*
LPL 1-2/BC NAME JHughey ABaxter GKulesa MKhanna DATE 3/8/2012 3/7/2012 02114/2012 311212012 OFFICIAL RECORD COpy 1 Agencywide Documents Access and Management System (ADAMS) Accession No. ML113081441.
2 ADAMS Accession No. ML113570208.