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{{#Wiki_filter: | {{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 3, 2016 Mr. Bryan C. Hanson Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer (CNO) | ||
Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555 | |||
==SUBJECT:== | ==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" | 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:== | ==Dear Mr. Hanson:== | ||
On December 17, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15324A439), 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. | On December 17, 2015 (Agencywide Documents Access and Management System (ADAMS) | ||
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. | Accession No. ML15324A439), the U.S. Nuclear Regulatory Commission (NRC) issued the following amendments: | ||
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 | : 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 | |||
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. | [updated final safety analysis report] Section 15.6.4 (for all six plants) because the SGTS [standby gas treatment system] and secondary containment are | ||
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. | 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. | ||
If you have any questions, please contact me at 301-415-1380. | The NRC staff discussed this issue with Exelon personnel during a call on January 28, 2016. | ||
Sincerely, | 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, 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 | |||
ML16029A343 *b1y e-ma1*1 OFFICE LPL3-2/PM LPL3-2/LA SCVB/BC LPL3-2/BC(A) LPL3-2/PM NAME BPurnell SRohrer RDennig* JPoole BPurnell DATE 2/03/2016 2/01/2016 2/03/2016 2/03/2016 2/03/2016}} | |||
Latest revision as of 02:20, 31 October 2019
| ML16029A343 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, LaSalle  |
| Issue date: | 02/03/2016 |
| From: | Blake Purnell Plant Licensing Branch III |
| To: | Bryan Hanson Exelon Generation Co |
| Purnell B | |
| References | |
| CAC MF5471, CAC MF5472, CAC MF5473, CAC MF5474, CAC MF5475, CAC MF5476 | |
| Download: ML16029A343 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 3, 2016 Mr. Bryan C. Hanson Senior Vice President 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. ML15324A439), 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.
Sincerely, 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
ML16029A343 *b1y e-ma1*1 OFFICE LPL3-2/PM LPL3-2/LA SCVB/BC LPL3-2/BC(A) LPL3-2/PM NAME BPurnell SRohrer RDennig* JPoole BPurnell DATE 2/03/2016 2/01/2016 2/03/2016 2/03/2016 2/03/2016