ML102080003
| ML102080003 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 07/30/2010 |
| From: | Balwant Singal Plant Licensing Branch IV |
| To: | Matthew Sunseri Wolf Creek |
| Singal, Balwant K, NRR/DORL 301-415-3016 | |
| References | |
| TAC ME2965 | |
| Download: ML102080003 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 20555-0001 July 30, 2010 Mr. Matthew W. Sunseri President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington. KS 66839
SUBJECT:
WOLF CREEK GENERATING STATION - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATION 3.8.4, "DC SOURCES OPERATING,"
SURVEILLANCE REQUIREMENTS 3.8.4.2 AND 3.8.4.5 (TAC NO. ME2965)
Dear Mr. Sunseri:
By letter dated December 16, 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML093640042), Wolf Creek Nuclear Operating Corporation (WCNOC.
the licensee) submitted a request for a license amendment to revise Technical Specification (TS) 3.8.4, "DC [Direct Current] Sources - Operating," Surveillance Requirements (SRs) 3.8.4.2 and 3.8.4.5 for Wolf Creek Generating Station.
The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the information provided by the licensee and determined that additional information identified in the enclosure to this letter is needed in order for the NRC staff to complete its review. The draft copy of the request for additional information was provided to Ms. Diane Hooper of your staff via e-mail on July 19, 2010. Mr. Steve Wideman of WCNOC informed the NRC staff on July 28, 2010, that a conference call to discuss the request for additional information is not needed and agreed to provide the response within 30 days of the date of the letter.
If you have any questions, please contact me at 301-415-3016 or balwant.singal@nrc.gov.
Sincerely, rr--171JJ! ~
Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482 Enclosure As stated cc w/encl: Distribution via Listserv
REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATION 3.8.4, "DC SOURCES - OPERATING,"
SURVEILLANCE REQUI'REMENTS 3.8.4.2 AND 3.8.4.5 WOLF CREEK GENERATING STATION DOCKET NO. 50-482 By letter dated December 16, 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML093640042), Wolf Creek Nuclear Operating Corporation (the licensee) submitted a request for a license amendment to revise Technical Specification (TS) 3.8.4, "DC [Direct Current] Sources - Operating," Surveillance Requirements (SRs) 3.8.4.2 and 3.8.4.5 for Wolf Creek Generating Station.
The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the information provided by the licensee and determined that the following additional information is needed in order for the NRC staff to complete its review:
- 1.
Regarding Calculation Change Notice 007 to Calculation No. NK-E-002, "Class 1E Battery Sizing," please provide a summary of changes that were made to the battery sizing calculation to support this license amendment request (LAR).
- 2.
In the LAR, the licensee stated that calculation No. NK-E-002-004-CN007 established 48 micro ohms as the suitable battery "individual inter-cell connection resistance" design value. Please provide a summary of this calculation to show how the 48 micro ohm inter-cell connector resistance design limit was derived.
- 3.
The following questions pertain to the Basic Engineering Disposition (BED),
"Administrative/Procedural Control Limits for NK Battery Connections," that was provided in the LAR:
- a.
Please provide the technical basis for subtracting the combined inter-tier, inter bank, and terminal connections to determine the inter-cell connection resistance limit of 33 micro ohms.
- b.
Table B1 of Attachment 1 of the LAR (page 14 of 16), "Individual Resistance Design Limit of Vendor-provided Battery Inter-Cell Connector," identifies 48 micro ohms as the individual resistance design limit of vendor provided battery inter-cell connectors. Table 85 of Attachment 1 of the LAR (page 14 of 16), "60-cell battery system Administrative Control limit for Resistance of Individual Vendor provided Battery Inter-cell Connector," shows how the licensee determined the inter-cell connection resistance limit of 33 micro ohms. Please provide a detailed technical discussion on the two different resistance values for the same individual inter-cell connector.
Enclosure
- 2
- c.
The proposed TS limits on battery resistance do not bound the 'provisional' configurations that are identified in the BED. Please explain how the proposed TS limits address permissible battery configurations.
- 4.
In the LAR, the licensee stated that for a normal 60-cell Battery System configuration, calculation No. NK-E-002-005 determined a maximum design value of 2,880 micro ohms
(= 60 Inter-cell connections x 48 micro ohms) for the "Maximum Calculated Total Battery Connection Resistance"; however, Reference 5 was not issued as of the date of issuance of this BED. Is this calculation complete? If so, please provide a summary of this calculation.
- 5.
In the LAR, the licensee stated that the review of the STS MT-020 NK battery connection resistance readings performed during three recent refueling outages via the sub-work orders (SWO's) listed in Reference 2 determined that the highest single value recorded for each of the terminal. inter-tier, and inter-bank connections is 98, 97, and 107 micro ohms, respectively. Please confirm that each battery passed every service test during this period.
- 6.
Please provide an executive summary of the calculation that demonstrates that the proposed TS changes will result in the battery being able to provide the minimum required voltages to the downstream loads during the worst-case scenario.
, Memo dated 7/16/10 "via email OFFICE NRRlLPL4/PM NRRlLPL4/LA DE/EEEB/BC NRR/LPL4/BC NRRlLPL4/PM NAME BSingal JBurkhardl'*
GWilson MMarkley BSingal (JRHall for)
DATE 7/29/10 7/29/10 7/16/10*
7/30/10 7/30/10