ML061160141

Notice of Meeting with Arizona Public Service Company Regarding Palo Verde Nuclear Generating Station, Unit 1 Shutdown Cooling Line Vibration Issue

ML061160141
Person / Time
Site:	Palo Verde
Issue date:	05/01/2006
From:	Fields M Plant Licensing Branch III-2
To:	Terao D Plant Licensing Branch III-2
Fields M , NRR/ADPT,415-3062
References
Download: ML061160141 (5)

Text

May 1, 2006 MEMORANDUM TO: David Terao, Branch Chief Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM: Mel B. Fields, Senior Project Manager /RA/

Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

SUBJECT:

FORTHCOMING MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING PALO VERDE NUCLEAR GENERATING STATION, UNIT 1 SHUTDOWN COOLING LINE VIBRATION ISSUE DATE & TIME: Thursday, May 11, 2006 8:00 a.m. - 12:00 noon LOCATION: U.S. Nuclear Regulatory Commission (NRC)

Two White Flint North 11555 Rockville Pike, Room O 3 B-4 Rockville, Maryland 20852 PURPOSE: To discuss the higher-than-normal vibration levels observed in the Train A shutdown cooling line and valve SI-651, and Arizona Public Service Company's plans for resolving this issue (see attached agenda).

CATEGORY:

• This is a Category 1 Meeting. The public is invited to observe this meeting and will have one or more opportunities to communicate with the NRC after the business portion, but before the meeting is adjourned.

PARTICIPANTS: Participants from the NRC include members of the Office of Nuclear Reactor Regulation.

NRC Arizona Public Service Company K. Manoly Carl Churchman D. Terao Scott Bauer M. Fields, et al. Mo Karbassian Winston Borrero Jeff Brown Docket No. STN 50-528

Enclosure:

Agenda cc w/encl: See next page MEETING CONTACT: Mel B. Fields, NRR 301-415-3062 mbf1@nrc.gov

• Commission's Policy Statement on Enhancing Public Participation in NRC Meetings," (67 FR 36920), May 28, 2002

May 1, 2006 MEMORANDUM TO: David Terao, Branch Chief Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM: Mel B. Fields, Senior Project Manager /RA/

Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

SUBJECT:

FORTHCOMING MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING PALO VERDE NUCLEAR GENERATING STATION, UNIT 1 SHUTDOWN COOLING LINE VIBRATION ISSUE DATE & TIME: Thursday, May 11, 2006 8:00 a.m. - 12:00 noon LOCATION: U.S. Nuclear Regulatory Commission (NRC)

Two White Flint North 11555 Rockville Pike, Room O 3 B-4 Rockville, Maryland 20852 PURPOSE: To discuss the higher-than-normal vibration levels observed in the Train A shutdown cooling line and valve SI-651, and Arizona Public Service Company's plans for resolving this issue (see attached agenda).

CATEGORY:

• This is a Category 1 Meeting. The public is invited to observe this meeting and will have one or more opportunities to communicate with the NRC after the business portion, but before the meeting is adjourned.

PARTICIPANTS: Participants from the NRC include members of the Office of Nuclear Reactor Regulation.

NRC Arizona Public Service Company K. Manoly Carl Churchman D. Terao Scott Bauer M. Fields, et al. Mo Karbassian Winston Borrero Jeff Brown Docket No. STN 50-528

Enclosure:

Agenda cc w/encl: See next page MEETING CONTACT: Mel B. Fields, NRR 301-415-3062 mbf1@nrc.gov

• Commission's Policy Statement on Enhancing Public Participation in NRC Meetings," (67 FR 36920), May 28, 2002 DISTRIBUTION:

Public RidsNrrPMMFields RidsNrrDorl LPL4 r/f RidsNrrLADJohnson RidsRgn4MailCenter(TPruett)

RidsOgcMailCenter RidsNrrAdro RidsNrrAdro (CDorsey)

TBloomer, EDO RIV RidsAcrsAcnwMailCenter RidsNrrDorlLplg RidsOpaMail PMNS KManoly Receptionist (OWFN and TWFN) (Hard Copy) VDricks, OPA RIV RJasinski, NRR Accession Number: NRC-001 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NAME MFields DJohnson DTerao DATE 5/1/06 5/1/06 5/1/06 OFFICIAL RECORD COPY

AGENDA MEETING WITH ARIZONA PUBLIC SERVICE COMPANY SHUTDOWN COOLING LINE VIBRATION ISSUE PALO VERDE NUCLEAR GENERATING STATION, UNIT 1 MAY 11, 2006

Background

During power ascension of Palo Verde Nuclear Generating Station (Palo Verde), Unit 1 in December 2005 following a refueling outage in which the steam generators were replaced, the vibration level of the Train A shutdown cooling (SDC) line and valve SI-651 was found to reach approximately two inches per second (ips) at approximately 32% rated thermal power. In order to prevent exceeding the SDC line vibration administrative limit of 2.0 ips and design limit of 2.25 ips, power ascension was stopped. Since that time, Unit 1 reactor power was limited to keep the SDC line vibration within the administrative limit. The SDC line vibration is hypothesized by Arizona Public Service Company to be the result of a flow-induced excitation of the fundamental acoustic frequency of the SDC suction line. The system is believed to be excited by a pressure disturbance originating at the suction line nozzle resulting from a coupled interaction between instabilities within the flow shear layer over the nozzle and the refracted standing wave in the line. Palo Verde is currently defueled and undergoing repair activities to correct the vibration problem.

Introductions 8:00 a.m.

History of SI-651 Vibration Issue Proposed Modifications Final Corrective Action Closing Remarks Public Comment/Questions Adjourn 12:00 noon

Palo Verde Generating Station, Unit 1 cc:

Mr. Steve Olea Mr. Hector R. Puente Arizona Corporation Commission Vice President, Power Generation 1200 W. Washington Street El Paso Electric Company Phoenix, AZ 85007 310 E. Palm Lane, Suite 310 Phoenix, AZ 85004 Mr. Douglas Kent Porter Senior Counsel Mr. John Taylor Southern California Edison Company Public Service Company of New Mexico Law Department, Generation Resources 2401 Aztec NE, MS Z110 P.O. Box 800 Albuquerque, NM 87107-4224 Rosemead, CA 91770 Mr. Thomas D. Champ Senior Resident Inspector Southern California Edison Company U.S. Nuclear Regulatory Commission 5000 Pacific Coast Hwy Bldg D1B P. O. Box 40 San Clemente, CA 92672 Buckeye, AZ 85326 Mr. Robert Henry Regional Administrator, Region IV Salt River Project U.S. Nuclear Regulatory Commission 6504 East Thomas Road Harris Tower & Pavillion Scottsdale, AZ 85251 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Mr. Jeffrey T. Weikert Assistant General Counsel Chairman El Paso Electric Company Maricopa County Board of Supervisors Mail Location 167 301 W. Jefferson, 10th Floor 123 W. Mills Phoenix, AZ 85003 El Paso, TX 79901 Mr. Aubrey V. Godwin, Director Mr. John Schumann Arizona Radiation Regulatory Agency Los Angeles Department of Water & Power 4814 South 40 Street Southern California Public Power Authority Phoenix, AZ 85040 P.O. Box 51111, Room 1255-C Los Angeles, CA 90051-0100 Mr. Craig K. Seaman, General Manager Regulatory Affairs and Mr. Brian Almon Performance Improvement Public Utility Commission Palo Verde Nuclear Generating Station William B. Travis Building Mail Station 7636 P. O. Box 13326 P.O. Box 52034 1701 North Congress Avenue Phoenix, AZ 85072-2034 Austin, TX 78701-3326 March 2006

Palo Verde Generating Station, Unit 1 cc:

Ms. Karen O'Regan Environmental Program Manager City of Phoenix Office of Environmental Programs 200 West Washington Street Phoenix AZ 85003 Mr. Matthew Benac Assistant Vice President Nuclear & Generation Services El Paso Electric Company 340 East Palm Lane, Suite 310 Phoenix, AZ 85004 March 2006