NL-14-0634, Response to the Request for Additional Information Regarding ISI Program Alternative FNP-ISI-ALT-14, Version 1.0

Response to the Request for Additional Information Regarding ISI Program Alternative FNP-ISI-ALT-14, Version 1.0

ML14113A533
Person / Time
Site:	Farley
Issue date:	04/22/2014
From:	Pierce C Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-14-0634
Download: ML14113A533 (6)

Text

Charles R. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc.

40 Inverness Center Parl<waY Post Office Box 1295 Birmingham, Alabama 35201 Tel 205.992.7872 Fax 205.992.7601 SOUTHERNA APR 2 2 2014 COMPANY Docket Nos.: 50-348 NL-14-0634 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant - Unit 1 Response to the Request for Additional Information Regarding ISI Program Alternative FNP-ISI-ALT-14, Version 1.0 Ladies and Gentlemen:

By letter dated February 18, 2014, (Agency-Wide Documents Access and Management System (ADAMS) Accession Number ML14050A382) Southern Nuclear Operating Company (SNC) submitted a proposed alternative tendon examination schedule for tendons affected by repair or replacement for Farley Nuclear Plant (FNP) - Unit 1.

Subsequently, by letter dated March 28, 2014, (ADAMS Accession Number ML14085A057), the U. S. Nuclear Regulatory Commission (NRC) submitted a Request for Additional Information (RAI) to enable completion of their review. The enclosure to this letter provides SNC's response to the RAIs.

This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

Respectfully submitted, C.R. Pierce Regulatory Affairs Director CRP/JMC/lac

Enclosure:

Response to Request for Additional Information

U. S. Nuclear Regulatory Commission NL-14-0634 Page2 cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Executive Vice President & Chief Nuclear Officer Ms. C. A. Gayheart, Vice President- Farley Mr. B. L. lvey, Vice President- Regulatory Affairs Mr. D. R. Madison, Vice President- Fleet Operations Mr. B. J. Adams, Vice President- Engineering RTYPE: CFA04.054/ CVC7000 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. S. A. Williams, NRR Project Manager- Farley Mr. P. K. Niebaum, Senior Resident Inspector- Farley Mr. J. R. Sowa, Resident Inspector- Farley

Farley Nuclear Plant - Unit 1 Response to the Request for Additional Information Regarding lSI Program Alternative FNP-ISI-ALT-14. Version 1.0 Enclosure Response to Request for Additional Information

Enclosure to NL-14-0634 Response to Request for Additional Information By letter dated February 18, 2014 (Agencywide Documents Access Management System, Accession Number ML14050A382), Southern Nuclear Operating Company, Inc., submitted a proposed alternative tendon examination schedule for tendons affected by repair or replacement for the Joseph M. Farley Nuclear Plant, Unit No. 1, during the fourth inservice inspection interval. In a letter from the NRC dated March 28, 2014, the NRC staff indicated that additional information was needed to perform their review of the proposed alternative. This enclosure contains the requested information.

FNP-ISI-ALT-14-RAI-1:

"The following ten (10) horizontal tendons: (H7AB, H25AC, H27AC, H28BC, H29AB, H30AC, H33AB, H35AB, H41AB, and H44AB), were affected by post-tensioning repair/replacement activities, as noted in the above Reference.

Please provide the required horizontal tendon force, according to the Farley Nuclear Plant (FNP) - Unit 1 current licensing basis, along with the minimum predicted force, expected at the next regularly scheduled FNP - Unit 1, American Society of Mechanical Engineers Boiler and Pressure Vessel Code,Section XI, IWL inspection (i.e. 4dh Year tendon surveillance), for these ten tendons."

SNC Response to FNP-ISI-ALT-14-RAI-1:

Per reference 5, (Sheet AS) and reference 7, the required horizontal tendons force is 6.01 Kips/wire or 1021.7 Kips total for one tendon (based on 170 wire tendon). Table 1 shows the minimum predicted force expected at the next regularly scheduled inspection for each of the ten aforementioned tendons.

Table 1 Minimum Predicted Force for 40th Year Tendon Surveillance (July 201 6)

Minimum Predicted Force Tendon (Listed as total in Kips for the tendon)

H7AB 1106.54 H25AC 1070.82 H27AC 1096.48 H28BC 1082.79 H29AB 1078.04 H30AC 1085.03 H33AB 1089.01 H35AB 1070.94 H41AB 1075.99 H44AB 1080.82

Conclusion:

All values for predicted force are above minimum value of 1021.7 Kips E- 1

Enclosure to NL-14-0634 Response to Request for Additional Information FNP-ISI-ALT-14-RAI-2:

"For the ten horizontal tendons noted in FNP-151-AL T-14-RAI-1, please provide any information relative to indications of water intrusion or corrosion in these tendons and discuss any corrective actions taken, if indications of water intrusion or corrosion were observed."

SNC Response to FNP-ISI-ALT-14-RAI-2:

Table 2 summarizes the inspections performed for water intrusion and corrosion on the tendons affected by the repair/replacement activity. Only the details for the Field End are shown since these were the anchorheads that were replaced.

Also noted below is the corrosion levels utilized during tendon examinations.

Level "A" and "8" corrosion is considered acceptable and neither requires a justification.

Corrosion Levels and Descriptions A- No visible rust (mill oxide coating is in this category).

8 - Rust which appears to have formed prior to initial filler installation and shows no evidence of having progressed in the interim.

C - New or progressive rust. NOTE: A Nonconformance Report SHALL be written.

E-2

Enclosure to NL-14-0634 Response to Request for Additional Information Table 2 Water Intrusion and Corrosion Inspection Results for Tendons Affected by Repa1r "/R eQJacement I

Water Corrosion Tendon Item/Level Justification for Water or Corrosion Detected (As-Found)

No signs of rust on H7AB No fractured N/A anchorhead pieces Button heads I A H25AC No Anchorhead I A N/A Shims/ A Bearing Plate I B Button heads I A H27AC No Anchorhead I A N/A Shims/ A Bearing Plate I B Buttonheads I A 12 oz. of water observed during detensioning.

Anchorhead I B H28BC Yes Acceptable based on no level "C" corrosion.

Shims/ B Bearing Plate I B Will be tracked in database of tendon inspections.

Button heads I A Anchorhead I A H29AB No N/A Shims/ A Bearing Plate I B NCR FN1097-003 Buttonheads I B Anchorhead I B Acceptable since only Bearing Plate level "C".

H30AC No Shims/B Bearing Plate Restored to level "B" for Post Re-Bearing Plate I C tensioning.

Buttonheads I B Anchorhead I B H33AB No N/A Shims/B Bearing Plate I B NCR FN1 078-002 Buttonheads I B Acceptable since only Shims/Bearing Plate level Anchorhead I C H35AB No "C" and Anchor Head will be replaced.

Shims/C Bearing Plate I C Shims/Bearing Plate Restored to level "B" for Post Re-tensioning.

Buttonheads I A H41AB No Anchorhead I B N/A Shims/ A Bearing Plate I B Button heads I 8 Anchorhead I B H44AB No N/A Shims /B Bearing Plate I 8 E-3