ML13011A389
| ML13011A389 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/22/2013 |
| From: | Thomas Wengert Plant Licensing Branch III |
| To: | Jeffery Lynch Northern States Power Co |
| Wengert T | |
| References | |
| TAC ME6849, TAC ME6850 | |
| Download: ML13011A389 (5) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 January 22, 2013 Mr. James E. Lynch Site Vice President Northern States Power Company - Minnesota Prairie Island Nuclear Generating Plant 1717 Wakonade Drive East Welch, MN 55089-9642
SUBJECT:
PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST TO ADD DIESEL FUEL OIL LICENSE BASES AND REVISE TECHNICAL SPECIFICATIONS 3.7.8 AND 3.8.3 (TAC NOS. ME6849 AND ME6850)
Dear Mr. Lynch:
By letter dated August 11, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML112240140), as supplemented by letters dated February 21, July 9, and October 4,2012 (ADAMS Accession Nos. ML12054A057, ML12192A213, and ML12279A116, respectively), Northern States Power Company, a Minnesota corporation (NSPM, the licensee), doing business as Xcel Energy, requested approval from the Nuclear Regulatory Commission (NRC) for additional diesel fuel oil license bases and amendments to Technical Specifications 3.7.8, "Cooling Water (CL) System" and 3.8.3, "Diesel Fuel Oil," for the Prairie Island Nuclear Generating Plant, Units 1 and 2.
The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with Mr. Dale Vincent of your staff on January 8, 2013, it was agreed that you would provide a response to this request by February 8, 2013.
The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC's goal of efficient and effective use of staff resources.
J. E. Lynch If circumstances result in the need to revise the requested response date, please contact me at (301) 415-4037.
Docket Nos. 50-282 and 50-306
Enclosure:
Request for Additional Information cc w/encl: Distribution via ListServ Sincerely, Thomas J. Wengert, Senior Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
REQUEST FOR ADDITIONAL INFORMATION (RAI)
PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 DOCKET NOS. 50-282 AND 50-306 By letter dated August 11, 2011, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML112240140), as supplemented by letters dated February 21, July 9, and October 4,2012 (ADAMS Accession Nos. ML12054A057, ML12192A213, and ML12279A116, respectively), Northern States Power Company, a Minnesota corporation (NSPM, the licensee), doing business as Xcel Energy, requested approval from the Nuclear Regulatory Commission (NRC) for additional diesel fuel oil license bases and amendments to Technical Specifications (TS) 3.7.8, "Cooling Water (CL) System" and 3.8.3, "Diesel Fuel Oil,"
for the Prairie Island Nuclear Generating Plant (PINGP), Units 1 and 2. The NRC staff has reviewed this request and the supplemental responses and has determined that the following information is required to complete its review.
Electrical Engineering Branch (EEEB) RAls RAI EEEB-13 The license amendment request (LAR) states that six Design Class I fuel oil storage tanks (19,500 nominal, 17,500 available gallons each) supply fuel oil to the two emergency diesel generators (EDGs) 01/02 and the two diesel-driven cooling water pumps (DDCLPs). These six Design Class I tanks are interconnected such that any tank can be manually aligned to supply any diesel day tank. Therefore, any combination of the six tanks can be used to meet the 14-day storage capacity requirement for a probable maximum flood. This licensing basis will be maintained.
Based on a review of the fuel oil and diesel system flow diagram NF-39232, mechanical isolation valves such as FO-2-6, FO-2-7, FO-13-4, FO-13-5 and the associated piping system may be used to meet the 14-day storage requirement in the Unit 1 EDG system. Verify that the operability of these and other similar valves and piping systems that may be used to transfer fuel within the interconnected fuel oil system with six safety related tanks will be routinely tested using plant procedures to demonstrate the 14-day fuel oil supply capability.
RAI EEEB-14 The "Proposed Changes" section of the LAR states that this LAR also proposes "revisions to the associated TS 3.7.8 and 3.8.3 to require the Unit 1 [diesel fuel oil (DFO)] storage system to have two trains of [fuel oil supply (FOS)] sufficient to operate one Unit 1 EDG and one DDCLP for seven days and for the Unit 2 DFO storage system to have two trains of FOS sufficient to operate one Unit 2 EDG for seven days." [emphasis added]
Clarify the intent of the above statements and provide a listing of the components in the FOS trains for each EDG.
Enclosure
-2 RAI EEEB-15 NSPM's February 21,2012, response to RAI EEEB-1a states that the Unit 1 EDG system has two safety related tanks (121 and 122 DSL GEN OIL) associated with EDG D1, and one safety related tank, 121 DSL CLWP. (EDG D2 has a similar set of tanks). The LAR states that any combination of the three tanks may be used to meet the seven-day fuel oil requirement of the EDG D1 and CLWP 1.
a) Technical Specification Surveillance Requirement (SR) 3.8.1.5 requires the licensee to verify, every 31 days, that the fuel oil transfer system operates to transfer fuel oil from storage tank to day tank. Validate that the surveillance requirements associated with proposed change will confirm the operability of all flow paths associated with each DSL tank and the associated EDG and the CLWP.
b) It is the NRC staff's understanding that the combination of 121 and 122 DSL GEN and 121 DSL CLWP storage tanks will constitute one train of fuel oil system associated with EDG D1 emergency power supply system and storage tanks 123 and 124 DSL GEN coupled with 122 DSL CLWP will comprise the redundant train of the fuel oil system for EDG D2. Verify that the intent of the proposed LAR is to have a seven-day storage capacity in each train of the Unit 1 EDG system as described above. Similarly the Unit 2 EDG system has 2 safety related tanks associated with each EDG. Verify that each train (2 tanks per train) will maintain the seven-day storage capacity.
c) Provide the revised Updated Safety Analysis Report (USAR) description of the specific EDG fuel oil components, using plant-specific nomenclature, that comprise each credited seven-day EDG fuel oil train as described in the proposed TS Bases, that will be incorporated in the USAR prior to implementation of this license amendment.
d) Clarify the intent of words "one or both" as used in proposed changes to TS 3.7.8 and 3.8.3. Describe if "one or both" is related to each train of equipment or specific components or tanks.
RAI EEEB-16 In NSPM letter dated October 4,2012 (ADAMS Accession No. ML12279A116), the licensee stated that a large break LOCA [Ioss-of-coolant accident] event with large loads such as the residual heat removal pumps, high pressure safety injection pumps and containment spray pumps secured after 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> is the bounding case for fuel oil consumption.
a) Verify that events such as a small break LOCA (2 inch or smaller), a steam generator tube rupture or a small steam line break do not require operation of large loads for an extended duration (Le., longer than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />).
b) What process ensures that the major loads would be reduced after 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> for all design basis accidents considered in Section 14 of the PINGP USAR?
J. E. Lynch
-2 If circumstances result in the need to revise the requested response date, please contact me at (301) 415-4037.
Sincerely, IRAJ Thomas J. Wengert, Senior Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-282 and 50-306
Enclosure:
Request for Additional Information cc w/encl: Distribution via ListServ DISTRIBUTION:
PUBLIC LPL3-1 R/F RidsNrrPMPrairielsland Resource RidsAcrsAcnw_MailCTR Resource RidsRgn3MailCenter Resource RidsNrrDorlLpl3-1 Resource RidsNrrLABTully Resource RidsOgcRp Resource RidsNrrDeEeeb Resource RidsNrrDorlDpr Resource GMatharu, NRR GWaig, NRR ADAMS Accession Number' ML13011A389 FICE NRRlLPL3-1/PM NRRlLPL3-2/LA NRR/EEEB/BC NRR/LPL3-1/BC NRR/LPL3-1/PM NAME TWengert SRohrer JAndersen RCarlson TWengert DATE 01/14/13 01/14/13 01/15/13 01/17/13 01/22/13 OFFICIAL RECORD COPY