ML102861886
| ML102861886 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 10/21/2010 |
| From: | John Hughey Plant Licensing Branch 1 |
| To: | Pacilio M Exelon Nuclear Generation Corp |
| Hughey J, NRR/DORL, 301-415-3204 | |
| References | |
| TAC ME4131, TAC ME4132 | |
| Download: ML102861886 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 21, 2010 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 RELATED TO LIQUID NITROGEN STORAGE (TAC NOS. ME4131 AND ME4132)
Dear Mr. Pacilio:
By letter to the Nuclear Regulatory Commission (NRC) dated June 25, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101790114), Exelon Generation Company, LLC, (Exelon) submitted a request to revise the Technical Specifications (TS) for the Peach Bottom Atomic Power Station, Units 2 and 3. The proposed change would revise TS Surveillance Requirement (SR) 3.6.1.3, "Primary Containment Isolation Valves," and SR 3.6.1.5, "Reactor Building-to-Suppression Chamber Vacuum Breakers," to modify the required level for the liquid nitrogen storage tank. Exelon supplemented the amendment request on August 16, 2010, in response to the NRC staff's request for supplemental information dated July 30, 2010. The NRC staff has reviewed the request and supplement submitted by the licensee and determined that additional information is needed as set forth in the Enclosure.
The draft question was sent to Mr. Richard Gropp, of your staff, to ensure that the question was understandable, the regulatory basis for the question was clear, and to determine if the information was previously docketed. On October 20, 2010, Mr. Gropp indicated that the licensee will submit a response by December 6, 2010. 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 me at (301) 415-3204.
sp;;;~
John D. Hughey, Project C Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-277 and 50-278
Enclosure:
As stated cc w/encl: Distribution via ListServ
REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST RELATED TO LIQUID NITROGEN STORAGE 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 June 25, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101790114), Exelon Generation Company, LLC, (Exelon) submitted a request to revise the Technical Specifications (TS) for the Peach Bottom Atomic Power Station, (PBAPS) Units 2 and 3. The proposed change would revise TS Surveillance Requirement (SR) 3.6.1.3, "Primary Containment Isolation Valves (PCIVs)," and SR 3.6.1.5, "Reactor Building-to-Suppression Chamber Vacuum Breakers," to modify the required level for the liquid nitrogen storage tank. Exelon supplemented the amendment request on August 16, 2010, in response to the NRC staffs request for supplemental information dated July 30, 2010. The NRC staff has reviewed Exelon's submittal and determined that additional information, as described below, is needed to complete the review.
The NRC supplemental information letter dated July 30, 2010 (ADAMS Accession No. ML102110061), requested that Exelon provide the calculations that determined the liquid nitrogen tank level/volume correlation for 16 inches of water column to 50,000 standard cubic feet (sct) and 22 inches of water column to 124,000 set, as described in the application dated June 25, 2010. Exelon submitted supplemental information by letter dated August 16, 2010 (ADAMs Accession No. ML102310079). The Attachment associated with the supplemental information letter contained Calculation PM-0375, "To Establish Demand for Nzfor the CAD
[containment atmospheric dilution] System and the SGIG [safety grade instrument gas] System for Dual Unit Operation," Revision 4. Page 23 of the calculation states that a vendor-supplied correlation from Process Engineering Inc. is used to perform the tank level calculations (Reference 18, to calculation PM-0375). This Reference 18 is included in the attachment and page 1 of the reference states the following regarding the charts containing the subject tank level/volume correlation:
All of these charts are based on very limited research into these now seventeen year old units, and should be used for reference only.
Title 10 of The Code of Federal Regulations, Part 50, Appendix B (10 CFR 50, App B),Section III, "Design Control," requires that design control measures shall provide for verifying or checking the adequacy of design, such as by the performance of design reviews, by the use of alternate or simplified calculation methods, or by the performance of suitable testing program.
RAI-01
Provide justification that the vendor-supplied information used in Exelon calculation PM-0375, Revision 4, to determine the liquid nitrogen tank level/volume correlation for 16 inches of water column to 50,000 standard cubic feet (sct) and 22 inches of water column to 124,000 set, as described in the application dated June 25,2010, meets the requirements of 10 CFR 50, App B,Section III, "Design Control."
Enclosure
October 21, 2010 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville,IL 60555 SUB~IECT:
PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST RELATED TO LIQUID NITROGEN STORAGE (TAC NOS. ME4131 AND ME4132)
Dear Mr. Pacilio:
By letter to the Nuclear Regulatory Commission (NRC) dated June 25, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101790114), Exelon Generation Company, LLC, (Exelon) submitted a request to revise the Technical Specifications (TS) for the Peach Bottom Atomic Power Station, Units 2 and 3. The proposed change would revise TS Surveillance Requirement (SR) 3.6.1.3, "Primary Containment Isolation Valves," and SR 3.6.1.5, "Reactor Building-to-Suppression Chamber Vacuum Breakers," to modify the required level for the liquid nitrogen storage tank. Exelon supplemented the amendment request on August 16, 2010, in response to the NRC staff's request for supplemental information dated July 30, 2010. The NRC staff has reviewed the request and supplement submitted by the licensee and determined that additional information is needed as set forth in the Enclosure.
The draft question was sent to Mr. Richard Gropp, of your staff, to ensure that the question was understandable, the regulatory basis for the question was clear, and to determine if the information was previously docketed. On October 20, 2010, Mr. Gropp indicated that the licensee will submit a response by December 6, 2010. 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 me 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:
As stated cc w/encl: Distribution via ListServ DISTRIBUTION:
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HChernoff DATE 10/21/2010 10/2112010 10/13/2010 10/21/2010 OFFICIAL RECORD COPY