ML17228B249
| ML17228B249 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 08/23/1995 |
| From: | Norris J NRC (Affiliation Not Assigned) |
| To: | Goldberg J FLORIDA POWER & LIGHT CO. |
| Shared Package | |
| ML17228B250 | List: |
| References | |
| TAC-M91704, NUDOCS 9508250287 | |
| Download: ML17228B249 (4) | |
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UNITED STATES NUCLEAR REGULATORY COMMlSSION WASHINGTON, O.C. 20555-0001 August 25, 1995 Mr. J.
H. Goldberg President Nuclear Division Florida Power and Light Company Post Office Box 14000 Juno, Beach, Florida 33408-0420
SUBJECT:
ST.
LUCIE UNIT 2 FRACTURE MECHANICS EVALUATION OF PRESSURIZER INSTRUMENT NOZZLES TAC NO. M91704
Dear Mr. Goldberg:
On March 2, 1995, Florida Power and Light Company (FPL), submitted for NRC
- approval, the fracture mechanics evaluation of St. Lucie 2 pressurizer instrument nozzles.
FPL later responded to NRC's request for additional information by sending in its response on July 7,
- 1995, and Revision 1 of the report on August 2, 1995.
The evaluation documented in these reports is an update of a submittal dated March 28,
- 1994, which was approved by the NRC on April 1, 1994.
The issue originated from boric acid leakage from the "C"
instrument nozzle in the pressurizer upper head, which was detected during the 1994 refueling outage.
Using IWB-3600 of Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel
- Code, the FPL's contractor made some very conservative assumptions in the 1994 flaw evaluation to gain approval without flaw removal or repair for one fuel cycle.
The current submittal by FPL was intended to gain approval for 30-year plant life using more realistic assumptions and employing finite element models in the analytical evaluation of the nozzles flaws.
A proposed inservice examination plan in accordance with IWB-2420 (b) and (c) is also included in this report.
The staff has completed the review and found the submittals acceptable.
The staff concludes that the methodology and criteria used in the flaw evaluation for the pressurizer instrument nozzles of St. Lucie 2 plant are in accordance with IWB-3600 of Section XI of the ASME Code.
Based on the information provided, the staff also determines that the fatigue crack growth methodology is adequate.
- Hence, the reported flaws are acceptable without repair for an additional 30 years of plant life.
The proposed inservice inspection plan and schedule in Attachment C, which addresses the inservice reexamination requirements of IWB-2420 of the ASME Code, calls for ultrasonic reexamination of the four repaired instrument nozzles during the next three inspection periods and is adequate.
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Mr. J.
H. Goldberg August 23, 1995 The Enclosure to this letter contains the staff's Safety Evaluation.
This completes our work on TAC No. M91704.
Sincerely, (Original Signed By)
Jan A. Norris, Sr. Project Manager Project Directorate II-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-389
Enclosure:
As stated cc w/enclosure:
See next page Distribution
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Hr. J.
H. Goldberg The Enclosure to this letter contains the staff's Safety Evaluation.
This completes our work on TAG No. N91704.
Docket No. 50-389
Enclosure:
As stated cc w/enclosure:
See next page Sincerely, Ja( A. Norris,
. Project Manager Project Directorate II-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation
Hr. J.
H. Goldberg Florida Power and Light Company CC:
Jack Shreve, Public Counsel Office of the Public Counsel c/o The Florida Legislature ill West Madison Avenue, Room 812 Tallahassee, Florida 32399-1400 Senior Resident Inspector St.
Lucie Plant U.S. Nuclear Regulatory Commission 7585 S.
Mwy A1A Jensen
- Beach, Florida 34957 Mr. Joe Hyers, Director Div. of Emergency Preparedness Department of Community Affairs 2740 Centerview Drive Tallahassee, Florida 32399-2100 J.
R.
Newman
- Morgan, Lewis
& Bockius 1800 H Street, N.W.
Washington, DC 20036 John T. Butler, Esq.
- Steel, Hector and Davis 4000 Southeast Financial Center Miami, Florida 33131-2398 Hr. Thomas R.L. Kindred County Administrator St.
Lucie County 2300 Virginia Avenue Fort Pierce, Florida 34982 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations ABB Combustion Engineering, Nuclear Power 12300 Twinbrook Parkway, Suite 330 Rockville, Maryland 20852 St. Lucie Plant Hr. Bill Passetti Office of Radiation Control Department of Health and Rehabilitative Services 1317 Winewood Blvd.
Tallahassee, Florida 32399-0700 Regional Administrator, RII U.S. Nuclear Regulatory Commission 101 Marietta Street N.W., Suite 2900 Atlanta, Georgia 30323 Hr. H.
N. Paduano, Manager Licensing
& Special Programs Florida Power and Light Company P.O.
Box 14000 Juno
- Beach, Florida 33408-0420 D. A. Sager, Vice President St. Lucie Nuclear Plant P.O.
Box 128 Ft. Pierce, Florida 34954-0128 C. L. Bur ton Plant General Manager St. Lucie Nuclear Plant P.O.
Box 128 Ft. Pi er ce, Florida 34954-0128