ML031250478
| ML031250478 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/02/2003 |
| From: | Subbaratnam R NRC/NRR/DRIP/RLEP |
| To: | |
| Subbaratnam R NRR/DRIP/RLEP, 415-1478 | |
| References | |
| Download: ML031250478 (9) | |
Text
May 2, 2003 LICENSEE: Omaha Public Power District FACILITY: Fort Calhoun Station, Unit 1
SUBJECT:
SUMMARY
OF TELECOMMUNICATION WITH OMAHA PUBLIC POWER DISTRICT (OPPD) TO DISCUSS THE POTENTIAL OPEN ITEMS AS THEY WERE INCORPORATED IN THE DRAFT SAFETY EVALUATION REPORT FOR RENEWAL OF THE OPERATING LICENSE FOR FORT CALHOUN STATION, UNIT 1 (FCS)
On March 18, 2003, the NRC staff (the staff) and representatives from OPPD held a telecommunication (telecon) to discuss electrical issues related to Potential Open Items (POIs) as they were incorporated in the Safety Evaluation Report for FCS license renewal. A list of telecon participants are enclosed (see Enclosure 1). The following is a summary of these discussions.
(1) POI-1(c) - In LRA Section 2.5.1, "Cables and Connectors," the applicant identified fuse blocks as components within the scope of license renewal and subject to an aging management review (AMR). The staff was unsure whether fuse holders were included within the component type "Fuse Block." By letter dated February 20, 2003, the staff issued POI-1(c), requesting the applicant to clarify whether fuse holders were within the scope of license renewal and subject to an AMR, and, if fuse holders are brought in and require aging management, to provide the associated aging management information.
Telecon Discussion:
At the March 18, 2003, telecon, OPPD representative stated that all fuse holders at FCS are within active enclosures such as switchgear, and motor control centers, and hence were not subject to environmental degradation and thus do not require aging management. The licensee considered all of these fuse holders essentially outside the scope for license renewal.
However, the staff was concerned that there may be some fuse holders such as the ones that isolate safety loads from non-safety loads, may actually be housed outside of the enclosures and may require AMR. The staff felt that the applicant should investigate this. If the licensee considered all fuse holders outside of the scope, they should make a positive statement to that effect on the docket, so that the staff can document and close the open item as such.
(2) POI-6(a) - The applicants AMR results for the electrical components for external environments were shown in Table 2 of the applicants response to RAI 2.5-1. This table also referred to plant-specific programs that have been credited for aging management of the station blackout (SBO) restoration system components. However, several SBO components (a high voltage bus work/duct, aluminum conductor, steel reinforced (ACSR) transmission cables and insulators associated with the transmission conductors) are not identified in this table as requiring an AMR. Therefore, it was not clear to the staff whether these components were within the scope of license renewal and subject to an AMR. By letter dated February 20, 2003, the staff issued a POI
requesting the applicant to clarify whether these components were within the scope and subject to an AMR.
Telecon Discussion:
Back feeding during a SBO:
The applicant response dated March 14, 2003, answered all the above issues. However, during the telecon, the staff requested that the applicant describe how the connections from both SBO recovery paths are made. Previously the applicant stated that the connection from the start up transformer to the on-site buses was made by cables. However, during the telecon the applicant did not elaborate on this clearly.
(3) POI-6(b) raised an issue that Table 2.5.20-1 stated that electrical bus bars and bus bar standoffs have no aging effects that require management. The basis for the applicants conclusion was unclear to the staff. By letter dated February 20, 2003, the staff issued POI-6(b), requesting the applicant to provide information on the components materials and environments, along with the basis for concluding that these components have no plausible aging effects.
Telecon Discussion:
During the telecon the staff raised additional issues as follows:
The applicant stated that the bus bar materials are copper and aluminum. Therefore, no aging effects were identified for these materials. However, there are several licensee event reports (LERs) and information notices (INs) written on the bus failures by other licensees. It was not clear to the staff if the applicant had considered all aging effects, particularly oxidation and corrosion of the metallic components. For example, oxidation of aluminum electrical connections could be problematic. The oxidation could create a high resistence connection resulting in additional heating at the connection and further oxidation until failure occurs. The staff requested the applicant to provide a description of its aging management program used to detect aging effects associated with oxidation and corrosion of metallic components, and loosening of fastener components in the electrical phase bus; or provide justification why such a program is not needed.
(4) POI Medium Voltage Cables:
During the telecon, the staff raised an additional issue as follows:
In LRA Appendix A, the summary of the AMR discusses only medium voltage cables. The staff requested that the applicant provide a brief summary description of the programs for managing aging effects for cables and connectors in accordance with NUREG-1800 Table 3.6-2,"FSAR Supplement for Aging Management of Electrical and Instrumentation and Control Systems."
These additional staff queries discussed in the telecon were sent to the applicant via an e-mail dated March 18, 2003 (see Enclosure 2).
OPPD has reviewed and provided comments on this Telecon summary.
/RA/
Ram Subbaratnam, Project Manager License Renewal Section License Renewal and Environmental Impacts Program Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation Docket No.: 50-285
Enclosures:
As stated cc w/encl: See next page
These additional staff queries discussed in the telecon were sent to the applicant via an e-mail dated March 18, 2003 (see Enclosure 2).
OPPD has reviewed and provided comments on this Telecon summary.
/RA/
Ram Subbaratnam, Project Manager License Renewal Section License Renewal and Environmental Impacts Program Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation Docket No.: 50-285
Enclosures:
As stated cc w/encl: See next page DISTRIBUTION:
C:\ORPCheckout\FileNET\ML031250478.wpd OFFICE PM:RLEP:DRIP PM:RLEP:DRIP LA:RLEP:DRIP SC:RLEP:DRIP NAME RSubbaratnam WBurton YEdmonds SLee DATE 05/2 /2003 05/2 /2003 05/2 /2003 05/2 /2003 OFFICIAL RECORD COPY
DISTRIBUTION: Summary of Telecon with OPPD Re: FCS RAIs, Dated: May 2, 2003 HARD COPY RLEP RF WBurton E-MAIL:
PUBLIC J. Johnson W. Borchardt D. Matthews F. Gillespie RidsNrrDe R. Barrett E. Imbro G. Bagchi K. Manoly W. Bateman J. Calvo C. Holden P. Shemanski H. Nieh G. Holahan H. Walker S. Black B. Boger D. Thatcher G. Galletti C. Li J. Moore R. Weisman M. Mayfield A. Murphy W. McDowell S. Smith (srs3)
T. Kobetz R. Assa S. Duraiswamy C. Munson RLEP Staff O. Chopra, EEIB, DE
Telecon Participants OPPD NRC Don Findlay Ram Subbaratnam, RLEP, NRC Bernie Van Sant Om Chopra, EEIB, DE, NRC Tom Matthews Tom Koshy, EEIB DE, NRC Philip A.Dibenedetto Duc Nuygen, EEIB DE, NRC Paul Gill, EEIB, DE Enclosure 1
Subject:
Clarification on William Burtons FCS POIs sent by PM William Burton- March 18 2003 call Creation Date: 3/18/03 4:50PM From: Ram Subbaratnam Created By: RXS2@nrc.gov Tom:
As promised, here is a summary of our thoughts and further clarifications that NRC staff need to close out the various POIs raised in todays conference call. A timely resolution and a quick response on the docket, will be to your advantage for successfully closing these POIs.
Clarifications sought by the NRC staff as a result of our conference call of March 18, 2003, as follows:
""POI-1(c)--The staff requests that the applicant make a positive statement that all Fuse Holders at FCS are within active enclosures such as switchgear, and motor control centers and are hence are considered outside the scope for license renewal. The applicant claims there is no fuseholder that would fall within the definition of being in a outside environment that would need aging management review. However, the staff is concerned that there may be some fuse holders, example ones used to isolate safety loads from non-safety loads. The applicant may not have been accounted for similar such holders, the applicant needs to investigate . Either revise its response accordingly or categorically confirm that there is none, which falls into this category.
POI -6(a)---The staff requests that the applicant describes how the connections from both SBO recovery paths are made. Needs more elaboration of the connection path up to and beyond main transformer .
POI-6(b)----The applicant states that the bus bar materials are copper and aluminum, therefore no aging effects were identified for these materials. However, there are several LERs and INs written on the bus failures. The staff is not clear if the applicant has considered all aging effects particularly, oxidation and corrosion of the metallic components. For example, oxidation of aluminum electrical connections can be problematic. The oxidation can create a high resistence connection resulting in additional heating at the connection and further oxidation until failure occurs. The staff requests the applicant to provide a description of its aging management program used to detect aging effects associated with oxidation and corrosion of metallic components, and loosening of fastener components in the electrical phase bus; or provide justification why such a program is not needed. Please use other licensees operational experience as an example.
POI-12--LRA Appendix A --this summary of the AMR discusses only medium voltage cables. The staff requests the applicant to provide a brief summary description of the programs for managing aging effects for cables and connectors in accordance with NUREG-1800 Table 3.6-2," FSAR Supplement for Aging Management of Electrical and Instrumentation and Control Systems." (SRP)"
If you have any questions, please do not hesitate to call Om Chopra directly and His phone number here at NRC is (301) 415 3265.
I am on vacation on Wednesday and Thursday and I will catch up on Friday.
Ram Subbaratnam PM Program Support RLEP, US NRC 301 415-1478 Enclosure 2
Ft. Calhoun Station, Unit 1 cc:
Winston & Strawn Mr. S. K. Gambhir ATTN: James R. Curtiss, Esq. Division Manager - Nuclear Operations 1400 L Street, N.W. Omaha Public Power District Washington, DC 20005-3502 Fort Calhoun Station FC-2-4 Adm.
Post Office Box 399 Mr. Kent Wilcox, Chairman Hwy. 75 - North of Fort Calhoun Washington County Board Fort Calhoun, NE 68023-0399 of Supervisors P.O. Box 466 Mr. Mark T. Frans Blair, NE 68008 Manager - Nuclear Licensing Omaha Public Power District Mr. Wayne Walker, Resident Inspector Fort Calhoun Station FC-2-4 Adm.
U.S. Nuclear Regulatory Commission Post Office Box 399 Post Office Box 309 Hwy. 75 - North of Fort Calhoun Fort Calhoun, NE 68023 Fort Calhoun, NE 68023-0399 Regional Administrator, Region IV Mr. Fred Emerson U.S. Nuclear Regulatory Commission Nuclear Energy Institute 611 Ryan Plaza Drive, Suite 1000 1776 I Street, N.W., Suite 400 Arlington, TX 76011 Washington, DC 20006-3708 Mr. John Fassell, LLRW Program Manager W. Dale Clark Library Health and Human Services Attn: Margaret Blackstone Regulation and Licensure 215 South 15th Street Consumer Health Services Omaha, NE 68102 301 Cententiall Mall, South P. O. Box 95007 Blair Public Library Lincoln, Nebraska 68509-5007 Attn: Ruth Peterson 210 South 17th Street Mr. Richard P. Clemens Blair, NE 68008-2055 Manager - Fort Calhoun Station Omaha Public Power District Fort Calhoun Station FC-1-1 Plant Post Office Box 399 Hwy. 75 - North of Fort Calhoun Fort Calhoun, NE 68023 Mr. Joseph Gasper Manager - Nuclear Licensing Omaha Public Power District Fort Calhoun Station FC-2-4 Adm.
Post Office Box 399 Hwy. 75 - North of Fort Calhoun Fort Calhoun, NE 68023-0399