L-2015-149, Response to Request for Additional Information (RAI) Reqardinq License Amendment Request to Permanently Extend the Integrated Leak Rate Test (ILRT) Frequency to 15 Years

Response to Request for Additional Information (RAI) Reqardinq License Amendment Request to Permanently Extend the Integrated Leak Rate Test (ILRT) Frequency to 15 Years

ML15140A081
Person / Time
Site:	Saint Lucie
Issue date:	05/14/2015
From:	Costanzo C Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2015-149, TAC MF4694, TAC MF4695
Download: ML15140A081 (9)

Text

0 May 14, 2015

• F L. L-2015-149 10 CFR 50.90 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001 Re: St. Lucie Units 1 and 2 Dockets Nos. 50-335 and 50-389 Response to Request for Additional Information (RAI) Reqardinq License Amendment Request to Permanently Extend the Integrated Leak Rate Test (ILRT)

Frequency to 15 Years (MF4694 and MF4695)

References:

1. FPL letter L-2014-230 dated August 26, 2014: St. Lucie Plant - Application for Technical Specifications Change to Permanently Extend the Integrated Leak Rate Test (ILRT)

Frequency to 15 Years [ML14241A496]

2. FPL letter L-2015-015 dated January 14, 2015: St. Lucie Plant, Units 1 and 2 - Response to Request for Additional Information (RAI) Regarding License Amendment Request to Permanently Extend the Integrated Leak Rate Test (ILRT) Frequency to 15 Years

[ML15029A496]

3. FPL letter L-2015-016 dated February 6, 2015: St. Lucie Plant, Units 1 and 2 - Response to Request for Additional Information (RAI) Regarding License Amendment Request to Permanently Extend the Integrated Leak Rate Test (ILRT) Frequency to 15 Years

4. NRC letter dated April 29, 2015: RAIs Regarding License Amendment Request to Extend the Containment Type A Leak Rate Test Frequency to 15 Years - St. Lucie Nuclear Plant (TAC NOs. MF4694 and MF4695) [ML15114A323]

Per Reference 1 above, Florida Power & Light Company (FPL) requested an amendment to the Renewed Facility Operating Licenses for St. Lucie Unit 1 and Unit 2. The license amendment request (LAR) would modify the St. Lucie Units 1 and 2 Technical Specifications to permanently extend the frequency of the containment integrated leak rate test (ILRT) from once per 10 years to once per 15 years. This application was supplemented by letters dated January 14, 2015 (Reference 2) and February 6, 2015 (Reference,3).

By letter dated April 29, 2015 (Reference 4), NRC staff requested additional information regarding the LAR. The enclosure to this letter provides a detailed response to a request for additional information (RAI) from the Containment and Ventilation Branch (SCVB).

The information provided in this submittal does not impact the 10 CFR 50.92 evaluation of "No Significant Hazards Consideration" previously provided in FPL letter L-2014-230. This submittal makes no new commitments or changes to existing commitments.

Should you have any questions regarding this submittal, please contact Mr. Eric Katzman, Licensing Manager, at (772) 467-7734.

P -

Florida Power & Light Company 6501 S, Ocean Drive, Jensen Beach, FL 34957

L-2015-149 Page 2 I declare under penalty of perjury that the foregoing is true and correct. Executed on May _*__ 2015.

Respectfully submitted, Christopher R. Costanzo Site Vice President St. Lucie Plant

Enclosure:

St. Lucie Units 1 and 2 ILRT LAR RAI Response cc: USNRC Regional Administrator, Region II USNRC Senior Resident Inspector, St. Lucie Units 1 and 2 USNRC Project Manager, St. Lucie Units 1 and 2 Ms. Cindy Becker, Florida Department of Health

L-2015-149 Enclosure Page 1 of 7 L-2015-149 Enclosure St. Lucie Units 1 and 2 ILRT LAR RAI Response Response to Request for Additional Information (RAI) Regarding License Amendment Request to Permanently Extend the Integrated Leak Rate Test (ILRT) Frequency to 15 Years (MF4694 and MF4695)

SCVB RAI 1 SCVB RAI 2

L-2015-149 Enclosure Page 2 of 7 SCVB RAI 1 This Request for Additional Information (RAI) was satisfactorily responded to by Florida Power &

Light Company (FPL) with Reference 4 (ADAMS Accession No. ML15029A496). Implicit with the licensee response, FPL is no longer seeking extensions to the allowed frequencies of the 10 CFR 50 Appendix J Type B and Type C tests as originally requested in the LAR.

RESPONSE

No response is required based on the NRC's statement above.

SCVB RAI 2 License Amendment Request (LAR) Section 3.1 "Previous Type A Test 3.1 Integrated Leak Rate Test (ILRT) Results" (pages 9 and 10, Enclosure, Reference 1) provides some details of the test results that satisfied the Technical Speciation 6.8.4.h requirements from the two most recent ILRTs for both St. Lucie Plants, Unit Nos. 1 and 2 *(SL-1 and 2). For SL-1, the most recent successful ILRT was completed in December 2005. For SL-2, the most recent successful ILRT was completed in December 2007.

Florida Power and Light Company (FPL) concluded, in the last sentence of page 9, that "Any unplanned modifications to the containment prior to the next scheduled Type A test would be subject to the special testing requirements (Section IV.A of 10 CFR 50 [Title 10 of the Code of Federal Regulations Part 50], Appendix J, 'Containment Modification,"' which reads:

Containment modification. Any major modification, replacement of a component which is part of the primary reactor containment boundary, or resealing a seal-welded door, performed after the preoperational leakage rate test shall be followed by either a Type A, Type B, or Type C test, as applicable for the area affected by the modification. The measured leakage from this test shall be included in the summary report required by V.B. The acceptance criteria of IIl.A.5.(b), III.B.3., or III.C.3., as appropriate, shall be met. Minor modifications, replacements, or resealing of seal-welded doors, performed directly prior to the conduct of a scheduled Type A test do not require a separate test.

As indicated in LAR Section 3.2, "Type B and Type C Testing (LLRT) [Local Leak-Rate Test Program" (page 10, Enclosure, Reference 1):

To permit operation at Extended Power Uprate (EPU) conditions, the NRC [U.S.

Nuclear Regulatory Commission] issued Amendment 213 [Agencywide Documents Access and Management System (ADAMS) Accession No.] ML12156A208), which raised the Unit 1 Pa [accident pressure] value from 39.6 psig [pounds per square inch gauge] to 42.8 psig, and Amendment 163 (ML12235A463), which raised the Unit 2 Pa value from 41.8 psig to 43.5 psig.

Amendment 213 for SL-1 was issued on July 9, 2012, and Amendment 163 for SL-2 was issued on September 24, 2012. The NRC staff notes that FPL indicated that all SL-1 and 2 components within the scope of the LLRT program are being tested at these revised Pa values with the words:

Currently all components within the scope of the LLRT program are being tested at a test frequency of each refueling outage. This was commenced prior to approval of EPU operation for both units to ensure compliance with the requirements for performing LLRT at or above Pa pressure and to conservatively establish a new

L-2015-149 Enclosure Page 3 of 7 performance history even though the new P, values are not significantly higher.

Currently, St. Lucie has not begun the reevaluation process for extended test intervals."

Given the above regulatory requirement and the above sequence of events:

a. The NRC staff notes that the last sentence of Section 9.2.3, "Extended Test Intervals," of Nuclear Energy Institute (NEI) 94-01 Revision 2-A (Reference 2) reads, "In the event where previous Type A tests were performed at reduced pressure (as described in 10 CFR 50, Appendix J, Option A), at least one of the two consecutive periodic Type A tests shall be performed at peak accident pressure (P,)."

Based on this statement for both SL-1 and 2, confirm that at least one of the actual ILRT test pressures employed during the two most recent Type A tests (per the guidance of American National Standards Institute/American Nuclear Society (ANSI/ANS) 56.8-1994 (Reference 3) bound the revised Pa values of SL-1 Amendment 213 and'SL-2 Amendment 163, respectively.

b. As noted in LAR Section 3.2, SL1- and 2 implemented conducting Appendix J, Type B and Type C tests at the revised Pa values and at a frequency of each refueling outage, prior to NRC approval of EPU operation. The NRC staff requests that FPL provide a summary of the cumulative Type B and Type C test totals from each of the refueling outages since this implementation.

In addition to providing a historical comparison, the staff requests that FPL provide the cumulative Type B and Type C test totals associated with the most recent SL-1 ILRT (completed in December 2005) and the most recent SL-2 ILRT (completed in December 2007). The staff also requests for the "PSL-1 [Plant St. Lucie, Unit No. 1] and PSL-2 LLRT Failures 2005-2014" listed in the tables of LAR Attachment 6, that FPL explain what corrective actions have been taken to correct the problems of components with a history of repetitive failures.

References:

1. Letter L-2014-230, dated August 26, 2014, from Joseph Jensen, FPL to NRC regarding License Amendment Request for the St. Lucie Nuclear Plant Regarding Permanently Extending the Integrated Leak Rate Test Frequency to 15 Years (ADAMS Accession No. ML14241A496).

2. Topical Report NEI 94-01, Revision 2-A, "Industry Guideline for Implementing Performance-Based Option of 10 CFR Part 50, Appendix J," October 2008 (ADAMS Accession No. MLI100620847).

3. ANSI/ANS-56.8-1994, "American National Standard for Containment System Leakage Testing Requirements."

L-2015-149 Enclosure Page 4 of 7

RESPONSE

SCVB RAI 2a - ILRT performed at ANSI/ANS-56.8-1994 requirements for EPU P, The most recent ILRTs on St. Lucie Unit 1 and Unit 2 met the requirements for Type A test (ILRT) pressure in conjunction with the current values for Pa developed from EPU and bound the revised P, values of Unit 1 Amendment 213 and Unit 2 Amendment 163, respectively.

ANSI/ANS-56.8-1994 Section 3.2.11 Type A Test Pressure. The Type A test pressure shall not be less than 0.96 P, nor exceed Pd. ....The test pressure shall be established relative to the external pressure of the primary containment measured at the start of the Type A test.

Unit I ILRT Pressure Sequence 12/7/05, 08:25 42.79 psig Secured air compressors 12/8/05, 00:41 41.43 psig Start Type A test 12/8/05, 08:48 41.29 psig End Type A test 12/8/05, 13:35 41.18 psig End verification test Pa = 42.8 psig 0.96Pa = 41.09 psig (from Unit 1 Technical Specification Amendment 213)

Note: The EPU calculated value was conservatively rounded upwards to 42.8 for program test implementation purposes.

Unit 2 ILRT Pressure Sequence 12/9/07, 23:30 43.11 psig Secured air compressors 12/10/07, 13:05 42.09 psig Start Type A test 12/10/07, 21:05 41.94 psig End Type A test 12/11/07, 01:15 41.85 psig End verification test Pa = 43.48 psig 0.96P, = 41.74 psig (from Unit 2 Technical Specification Amendment 163)

Note: The EPU calculated value was conservatively rounded upwards to 43.5 for program test implementation purposes.

L-2015-149 Enclosure Page 5 of 7 SCVB RAI 2b, Part I - Cumulative Type B & C Test (LLRT) Totals Unit 1 Outage Shutdown P. As- As- As-Left As-Left Notes Date (psig) Found Found Bypass Total Bypass Total (sccm) (sccm)

(sccm) (sccm)

SL1-25 9/2013 42.8 14,567 198,065 22,126 55,144 SL1-24 11/2011 42.8 20,088 27,599 22,951 56,825 SL1-23 4/2010 42.8 17,573 47,803 34,344 50,294 SL1-22 10/2008 39.6 16,688 89,879 31,698 62,718 SL1-21 4/2007 39.6 26,678 39,546 43,054 60,629 SL1-20 10/2005 39.6 15,450 28,570 51,584 103,593 ILRT Performed Total (Type B &C) Limit = 544,933 sccm Bypass Limit = 87,189 sccm Unit 2 Outage Shutdown Pa As- As- As-Left As-Left Notes Date (psig) Found Found Bypass Total Bypass Total (sccm) (sccm)

(sccm) (sccm)

SL2-21 3/2014 43.5 29,921 65,838 35,403 112,690 SL2-20 8/2012 43.5 32,608 72,035 39,710 87,729 SL2-19 1/2011 41.8 17,768 49,094 29,053 104,099 SL2-18 4/2009 41.8 17,832 58,714 29,927 85,259 SL2-17 9/2007 41.8 53,624 83,860 20,883 73,634 ILRT Performed SL2-16 4/2006 41.8 39,833 69,685 48,542 88,855 Total (Type B &C) Limit = 585,233 sccm Bypass Limit = 93,637 sccm

L-2015-149 Enclosure Page 6 of 7 SCVB RAI 2b, Part 2 - Actions Taken on Valves Exhibiting Repetitive Failures (Unit 1)

Unit 1

[AR - action request]

Component Date Description V5204 10/30/05 [AR 00424762] Bottom two belleville washers pinched between piston and upper piston shaft. Repaired under WO 34015405 and performed initial as-left test.

V5204 11/24/05 [AR 00480526] Post-maintenance test (As-Left). Reset stroke length and determined coupling on piston rod was not torqued sufficiently. Repaired under WO 35029155 and retested. Final as-left test was 18 sccm.

V5204 11/13/08 [AR 00455527] Post-maintenance test (As-Left). Swage tube fitting leaking following valve maintenance. Repaired under WO 38025739 and final as-left LLRT was 180 sccm.

FCV-26-3 4/10/10 [AR 00474657] Replaced seat ring and adjusted to reduce friction points at stem coupler/anti-rotation rib and valve stem/packing flange under WO 40006671. As-left test was 127.6 sccm.

FCV-26-3 12/3/11 [AR 01712224] Removed threaded seat ring and re-installed with PRI-102N thread.sealant under WO 40127510. As-Left test was 900 sccm. Subsequent LLRTs in the 2013 and 2015 outages had acceptable results. This valve is currently being maintained on the initial test interval As described in NEI-94-01.

L-2015-149 Enclosure Page 7 of 7 SCVB RAI 2b, Part 2 - Actions Taken on Valves Exhibiting Repetitive Failures (Unit 2)

Unit 2

[AR - action request]

Component Date Description FCV-25-36 8/15/06 [AR 00481633] Failed administrative limit but met Technical Specification limit during quarterly on-line surveillance testing.

After initial troubleshooting under WO 36015415 was scoped to outage.

FCV-25-36 11/24/07 [AR 00484072] Post-maintenance test (As-Left). Failed LLRT after initial diagnostics and maintenance under W036018338 and 36020891 to correct condition found during on-line test.

Valve was then replaced under WO 37025447 and final as-left test was 18 sccm.

FCV-25-36 10/28/12 [AR 01817385] Replaced Tefzel seat and seat o-ring under WO 40085547. The As-left LLRT was 18 sccm. This valve is tested quarterly in accordance with St. Lucie Technical Specifications.

Results of the quarterly surveillance LLRTs have been satisfactory since 2012.

SE-03-2B 10/21/07 [AR 00509403] Post-maintenance test (As-Left). Pilot disk not seating following maintenance. Replaced pilot disk and main disk under WO 37023274. As-left LLRT was 1,600 sccm.

SE-03-2A 1/17/11 [AR 01609506] Checked surfaces but no apparent defects noted. Skim cut and polished main disk under WO 40063404.

As- Left LLRT was 1,400 sccm.

SE-03-2B 8/16/12 [AR 01794724] Main disk not making full contact in seat. Lapped seat and disk under WO 40063405. As-left LLRT was 1,080 sccm.

SE-03-2A/B 3/10/14 [AR 01947012] Decision was made to work SE-03-2A and SE-03-2B simultaneously due to logistics and time involved for complete overhaul. Since SE-03-2A and SE-03-2B are parallel valves which cannot be isolated from each other the program dictates that both valves will be attributed with a failure.

SE-03-2B Pilot disk had groove and was sticking in seat.

Performed inspections and maintenance per upgraded maintenance procedure specific to these valves. Replaced main disk, pilot disk, and other parts as necessary for overhaul under WO 40299600.

SE-03-2A Pilot disk had groove at seating surface. Performed inspections and maintenance per upgraded maintenance procedure specific to these valves. Replaced main disk and pilot disk package and parts as necessary for overhaul under WO 40299599.

The As-left LLRT for SE-03-2A and SE-03-2B was 1,300 sccm.

These valves are being maintained on the initial test interval as described in NEI-94-01.