Letter Sequence Other |
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CAC:MF5471, Use of TS 3.10.1 for SCRAM Time Testing Activities (Approved, Closed) CAC:MF5472, Use of TS 3.10.1 for SCRAM Time Testing Activities (Approved, Closed) CAC:MF5473, Use of TS 3.10.1 for SCRAM Time Testing Activities (Approved, Closed) CAC:MF5474, Use of TS 3.10.1 for SCRAM Time Testing Activities (Approved, Closed) CAC:MF5475, Use of TS 3.10.1 for SCRAM Time Testing Activities (Approved, Closed) CAC:MF5476, Use of TS 3.10.1 for SCRAM Time Testing Activities (Approved, Closed) |
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MONTHYEARML15324A4392015-12-17017 December 2015 Issuance of Amendments (CAC Nos. MF5471-MF5476) Project stage: Approval ML16029A3432016-02-0303 February 2016 Recent Amendments Adding Technical Specification 3.10.8, Inservice Leak and Hydrostatic Testing Operations. Project stage: Other 2015-12-17
[Table View] |
Dresden Nuclear Power Station, Units 2 & 3; LaSalle County Station, Units 1 & 2; & Quad Cities Nuclear Power Station, Units 1 & 2 - Recent Amendments Adding Technical Specification 3.10.8, Inservice Leak and Hydrostatic Testing Operations.ML16029A343 |
Person / Time |
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Site: |
Dresden, Quad Cities, LaSalle |
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Issue date: |
02/03/2016 |
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From: |
Purnell B A Plant Licensing Branch III |
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To: |
Bryan Hanson Exelon Generation Co |
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Purnell B A |
References |
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CAC MF5471, CAC MF5472, CAC MF5473, CAC MF5474, CAC MF5475, CAC MF5476 |
Download: ML16029A343 (3) |
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Category:Letter
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E. Ginna - Nuclear Radiological Emergency Plan Document Revisions2024-07-12012 July 2024 Independent Spent Fuel Storage Installation, Nine Mile Point, Units 1 and 2, Quad Cities, Units 1 and 2, R. E. Ginna - Nuclear Radiological Emergency Plan Document Revisions SVP-24-041, Regulatory Commitment Change Summary Report2024-07-0505 July 2024 Regulatory Commitment Change Summary Report SVP-24-043, Registration of Use of Casks to Store Spent Fuel2024-07-0505 July 2024 Registration of Use of Casks to Store Spent Fuel ML24162A0982024-07-0303 July 2024 – Issuance of Amendment Nos. 301 and 297 Adoption of 10 CFR 50.69 “Risk Informed Categorization and Treatment of Structures, Systems, and Components for Nuclear Power Reactors” RS-24-064, Nuclear Radiological Emergency Plan Document Revisions2024-06-28028 June 2024 Nuclear Radiological Emergency Plan Document Revisions ML24178A2522024-06-27027 June 2024 County Station – Acknowledgement of Response to NRC Inspection Report 05000373/2024001 and 05000374/2024001 and Disputed Non-Cited Violation IR 05000237/20243012024-06-27027 June 2024 NRC Initial License Examination Report 05000237/2024301; 05000249/2024301 ML24138A0572024-06-26026 June 2024 – Issuance of Amendment Nos. 285 and 278 Application to Adopt TSTF-564, “Safety Limit Mcpr” SVP-24-040, Registration of Use of Casks to Store Spent Fuel2024-06-25025 June 2024 Registration of Use of Casks to Store Spent Fuel ML24138A1812024-06-18018 June 2024 Aging Management Audit Plan Regarding the Subsequent License Renewal Application Review ML24128A2742024-06-14014 June 2024 Notice of Acceptance and Opportunity for Hearing - 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[Table view] |
Text
Mr. Bryan C. Hanson Senior Vice President UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 3, 2016 Exelon Generation Company, LLC President and Chief Nuclear Officer (CNO) Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3; LASALLE COUNTY STATION, UNITS 1 AND 2; AND QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 -RECENT AMENDMENTS ADDING TECHNICAL SPECIFICATION 3.10.8, "INSERVICE LEAK AND HYDROSTATIC TESTING OPERATIONS"
Dear Mr. Hanson:
On December 17, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15324A439), the U.S. Nuclear Regulatory Commission (NRC) issued the following amendments:
- 1. Amendment No. 248 to Renewed Facility Operating License No. DPR-19 and Amendment No. 241 to Renewed Facility Operating License No. DPR-25 for Dresden Nuclear Power Station (DNPS), Units 2 and 3, respectively, 2. Amendment No. 219 to Facility Operating License No. NPF-11 and Amendment No. 205 to Facility Operating License No. NPF-18 for the LaSalle County Station (LSCS), Units 1 and 2, respectively, and 3. Amendment No. 261 to Renewed Facility Operating License No. DPR-29 and Amendment No. 256 to Renewed Facility Operating License No. DPR-30 for the Quad Cities Nuclear Power Station (QCNPS), Units 1 and 2, respectively.
The amendments added a new technical specification, Section 3.10.8, "lnservice Leak and Hydrostatic Testing Operation," including a new limiting condition for operation (LCO). After issuance of the amendments, Exelon Generation Company, LLC (Exelon, the licensee) informed the NRC staff of an issue with the underlined portion of the following paragraph from page 8 of the associated safety evaluation (SE): Prior to use of the special operation LCO 3.10.8 for the inservice leakage and hydrostatic testing of the RCS [reactor coolant system]. all main steam isolation valves and the primary containment isolation valves connected to RCS should be in their fully closed position, even though the primary containment is inoperable.
Therefore, if there is a main steam line break in the secondary containment during use of the LCO, the resulting conditions inside and outside the secondary containment are bounded by the conditions resulting from a large main steam line break inside the secondary containment in Mode 1 described in UFSAR [updated final safety analysis report] Section 15.6.4 (for all six plants) because the SGTS [standby gas treatment system] and secondary containment are B. Hanson operable for all six plants. Based on this, the NRC staff finds the proposed LCO 3.10.8 acceptable to the extent that GDC [general design criterion]-16 for LSCS and draft GDC-10 for DNPS and QCNPS would continue to be satisfied.
The NRC staff discussed this issue with Exelon personnel during a call on January 28, 2016. Exelon explained that some of the isolation valves are open or bypassed during testing to maintain shutdown cooling capability or to facilitate the 10-year extended boundary test of the reactor coolant system. As discussed in the license amendment request and reinforced by Exelon during the call, the plant conditions and conservatisms in the main steam line break analysis (UFSAR Section 15.6.4) envelope the expected conditions during testing. Exelon stated that its UFSAR Section 15.6.4 analysis assumed full power operations and did not take credit for secondary containment and the SGTS. Under the test conditions, the reactor is not operating and the RCS has a lower temperature thus any break would result in a smaller source term. Furthermore, LCO 3.10.8 requires that secondary containment and the SGTS are operable such that any radioactive release would be reduced due to holdup within secondary containment and filtration through the SGTS. The NRC staff considered the potential for some of the isolation valves to be open or bypassed during testing and determined that this does not alter the staff's finding in the SE that the UFSAR Section 15.6.4 analysis bounds the consequences of a pipe break in the primary system under the test conditions.
Therefore, the staff's conclusions in the SE are not affected.
The staff does not expect the licensee to change how it performs its testing to conform to the above statement.
If you have any questions, please contact me at 301-415-1380.
Docket Nos. 50-237, 50-249, 50-373, 50-374, 50-254, and 50-265 cc: Distribution via Listserv Sincerely, Blake Purnell, Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation B. Hanson operable for all six plants. Based on this, the NRC staff finds the proposed LCO 3.10.8 acceptable to the extent that GDC [general design criterion]-16 for LSCS and draft GDC-10 for DNPS and QCNPS would continue to be satisfied.
The NRC staff discussed this issue with Exelon personnel during a call on January 28, 2016. Exelon explained that some of the isolation valves are open or bypassed during testing to maintain shutdown cooling capability or to facilitate the 10-year extended boundary test of the reactor coolant system. As discussed in the license amendment request and reinforced by Exelon during the call, the plant conditions and conservatisms in the main steam line break analysis (UFSAR Section 15.6.4) envelope the expected conditions during testing. Exelon stated that its UFSAR Section 15.6.4 analysis assumed full power operations and did not take credit for secondary containment and the SGTS. Under the test conditions, the reactor is not operating and the RCS has a lower temperature thus any break would result in a smaller source term. Furthermore, LCO 3.10.8 requires that secondary containment and the SGTS are operable such that any radioactive release would be reduced due to holdup within secondary containment and filtration through the SGTS. The NRC staff considered the potential for some of the isolation valves to be open or bypassed during testing and determined that this does not alter the staff's finding in the SE that the UFSAR Section 15.6.4 analysis bounds the consequences of a pipe break in the primary system under the test conditions.
Therefore, the staff's conclusions in the SE are not affected.
The staff does not expect the licensee to change how it performs its testing to conform to the above statement.
If you have any questions, please contact me at 301-415-1380.
Sincerely, /RAJ Blake Purnell, Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-237, 50-249, 50-373, 50-374, 50-254, and 50-265 cc: Distribution via Listserv DISTRIBUTION:
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