ML101730331

06/17/10 Summary of Telephone Conference Call Held Between NRC and Arizona Public Service Co., Concerning Draft Request for Additional Information Pertaining to Palo Verde, Units 1, 2 & 3 License Renewal Application

ML101730331
Person / Time
Site:	Palo Verde
Issue date:	07/23/2010
From:	Lisa Regner License Renewal Projects Branch 2
To:
Lisa Regner, 415-1906
References
Download: ML101730331 (6)

Text

~t.",1'\ REGu<.q UNITED STATES

+~"  ;.o~ NUCLEAR REGULATORY COMMISSION

! ~ WASHINGTON, D.C. 20555-0001

<{

~

c;.;;

0 July 23,2010

~ l'

"'-? ..,,0 Jt***i' LICENSEE: Arizona Public Service Company FACILITY: Palo Verde Nuclear Generating Station, Units 1,2, and 3

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JUNE 17, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND ARIZONA PUBLIC SERVICE COMPANY, CONCERNING DRAFT REQUEST FOR ADDITIONAL INFORMATION PERTAINING TO THE PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3, LICENSE RENEWAL APPLICATION The U.S. Nuclear Regulatory Commission (the staff) and representatives of Arizona Public Service Company (the applicant) held a telephone conference call on June 17, 2010, to discuss and clarify the staff's draft request for additional information (RAI) concerning the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, license renewal application. The telephone conference call was useful in clarifying the intent of the staff's draft RAI.

Enclosure 1 provides a listing of the participants and Enclosure 2 contains a listing of the draft RAI discussed with the applicant, including a brief description on the status of the items.

The applicant had an opportunity to comment on this s mary.

Lisa M. Regner, Sr. Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-528, 50-529, and 50-530

Enclosures:

As stated cc: Distribution via Listserv

TELEPHONE CONFERENCE CALL PALO VERDE NUCLEAR GENERATING STATION, UNITS 1,2, AND 3 LICENSE RENEWAL APPLICATION LIST OF PARTICIPANTS JUNE 17, 2010 PARTICIPANTS AFFILIATIONS Lisa Regner U.S. Nuclear Regulatory Commission (NRC)

William C. Holston NRC Ashley Thomas NRC Angela Krainik Arizona Public Service Company (APS)

Glenn Michael APS Eric Blocher Strategic Teaming and Resource Sharing (STARS) Alliance ENCLOSURE 1

DRAFT REQUEST FOR ADDITIONAL INFORMATION PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 LICENSE RENEWAL APPLICATION JUNE 17, 2010 The U.S. Nuclear Regulatory Commission (the staff) and representatives of Arizona Public Service Company (the applicant) held a telephone conference call on June 17, 2010, to discuss and clarify the following draft request for additional information (RAI) concerning the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, (PVNGS) license renewal application (LRA).

DRAFT RAI 82.1.6-1

Background:

In its discussion of aging effects for cavitation erosion for treated water, EPRI 1010639, "Non-Class 1 Mechanical Implementation Guideline and Mechanical Tools," Appendix A, Section 4.1, "Assumptions," states, in part, that it is assumed cavitation erosion problems are a design deficiency, which will be detected and corrected during current operation, except when the cavitation occurs in infrequently operated systems. In these cases, it states that plant specific consideration may need to be addressed in the aging management review. In addition, the GALL Report, Table IX.E, "Aging Effects", notes that loss of material may be due to several causes and erosion is specifically included. Also, the GALL Report, Table IX.F, "Significant Aging Mechanisms," defines both cavitation and erosion.

Issue:

During a review of operating experience, the NRC identified a corrective action program document (CRDR 2932507), which documents a through-wall leak in piping immediately downstream of a valve in the high pressure safety injection (HPSI) refueling water tank (RWT) recirculation line "due to erosion by damaging cavitation." The apparent cause evaluation for this issue indicated that the flow-accelerated corrosion (FAC) program was to ultrasonically inspect these potentially susceptible components, and that the FAC program was to be revised to examine portions of all three units' HPSI train "B" recirculation piping every 18 months in order to assess cavitation erosion. The affected sections of the HPSI system are to be replaced on a conservative interval of every 7.5 years. While this will preclude further need of aging management for those specific locations, the apparent cause evaluation indicated that components and locations in other safety-related system were potentially susceptible to the same degradation mechanism.

Based on operating experience, the exception noted above in EPRI 1010639, regarding infrequently operated systems, appears to apply, and plant-specific consideration needs to be addressed in the aging management review.

ENCLOSURE 2

-2 In addition, the extent of condition section in the apparent cause evaluation indicates that it only addressed stainless piping and components in systems associated with heat removal and implied that the FAC program would address the cavitation erosion issue in carbon steel piping systems. The staff notes that although the FAC program monitors carbon steel piping, the implementing computer program, CHECWORKS, specifically excludes cavitation considerations, and that the scope of the FAC program only includes a limited number of systems (condensate, feedwater, etc.) that are operated within specific parameters (temperatures, pressures, oxygen content, etc.) associated with FAC.

Request:

1) For all in-scope piping and components that have been identified, either directly or as a result of the extent of condition evaluation, as being susceptible to cavitation erosion:

a) provide the currently established time-based replacement frequency and the basis for this frequency, or b) if a time-based replacement frequency will not be established, plior to the period of extended operation, provide the proposed aging management program for these segments or components until such time as a time-based replacement frequency is established, or c) provide the proposed aging management program that will be used to manage this age related degradation during the period of extended operation.

2) For any other in-scope piping and components in infrequently operated systems, which were excluded from the extent of condition evaluation discussed above, provide the basis to show that a cavitation erosion degradation mechanism, similar to that identified in the above plant specific operating experience, is not applicable.

Discussion: Following the discussion with APS staff, NRC staff will modify request 2 as follows:

2) For any other in-scope piping and components in infrequently operated water systems, which were excluded from the extent of condition evaluation discussed above, provide the basis to show that a cavitation erosion degradation mechanism, similar to that identified in the above plant-specific operating experience, is not applicable, or provide an AMP.

July 23, 2010 LICENSEE: Arizona Public Service Company FACILITY: Palo Verde Nuclear Generating Station, Units 1, 2, and 3

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JUNE 17, 2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND ARIZONA PUBLIC SERVICE COMPANY, CONCERNING DRAFT REQUEST FOR ADDITIONAL INFORMATION PERTAINING TO THE PALO VERDE NUCLEAR GENERATING STATION, UNITS 1,2, AND 3, LICENSE RENEWAL APPLICATION The U.S. Nuclear Regulatory Commission (the staff) and representatives of Arizona Public Service Company (the applicant) held a telephone conference call on June 17, 2010, to discuss and clarify the staff's draft request for additional information (RAI) conceming the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, license renewal application. The telephone conference call was useful in clarifying the intent of the staff's draft RAI. provides a listing of the participants and Enclosure 2 contains a listing of the D-RAI discussed with the applicant, including a brief description on the status of the items.

The applicant had an opportunity to comment on this summary.

IRA!

Lisa M. Regner, Sr. Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-528, 50-529, and 50-530

Enclosures:

As stated cc: Distribution via Listserv DISTRIBUTION:

See next page LA:RPOB:DLR :DLR BC:RPB2:DLR PM:RPB2:DLR SFigueroa DWrona LRegner 07/1/10 07/12/10 o OFFICIAL RECORD COpy

Memorandum to Arizona Public Service Company from Lisa M. Regner dated July 23, 2010

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JUNE 17,2010, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND ARIZONA PUBLIC SERVICE COMPANY, CONCERNING DRAFT REQUEST FOR ADDITIONAL INFORMATION PERTAINING TO THE PALO VERDE NUCLEAR GENERATING STATION, UNITS 1,2, AND 3, LICENSE RENEWAL APPLICATION DISTRIBUTION:

HARDCOPY:

DLR RF E-MAIL:

PUBLIC RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDIrRer1 Resource RidsNrrDlrRer2 Resource RidsNrrDlrRerb Resource RidsNrrDlrRpob Resource RidsNrrDciCvib Resource RidsNrrDciCpnb Resource RidsNrrDciCsgb Resource RidsNrrDraAfpb Resource RidsNrrDraApla Resource RidsNrrDeEmcb Resource RidsNrrDeEeeb Resource RidsNrrDssSrxb Resource RidsNrrDssSbpb Resource RidsNrrDssScvb Resource RidsOgcMailCenter Resource RidsOpaMail L. Regner B. Mizuno R. Treadway, RIV G. Pick, RIV