ML20024H505
| ML20024H505 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 05/23/1991 |
| From: | Silver H Office of Nuclear Reactor Regulation |
| To: | Beard P FLORIDA POWER CORP. |
| References | |
| TAC-77031, NUDOCS 9106040304 | |
| Download: ML20024H505 (2) | |
Text
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s May 23, 1991 Docket No. 50-302 DISTRIBU110N i DocketTTTi~
M51nkule Ril Mr. Percy M. Beard, Jr.
NRC & LPDRs DMiller j
Senior Vice President, PD22 Rdg File HBerkow Nuclear Operations Svarga Florida Pc+er Corporation CLainas ATTil: Manager, Nuclear Operations DDorman Licensing I. Silver P. O. Box 219-NA-21 OGC Crystal Piver, florida 32629 EJordan MNBB-3701 CYCheng 7/D/4
Dear Mr. Beard:
ULeckner 10/E/4 i
SUBJECT:
CRYSTAL RIVER UNIT 3 - STEAM GENERATOR EDDY CURRENT EXAMINATION (TAC NO. 77031)
The staff hos revicwed the results of the Refuel 7 eddy current examination of the once-thrcugh steam generator (OTSG) tubes at Crystal River Unit 3 (CR-3).
Although the approach used by Florida Power Corporation (FPC) to randomly select and sample tubes did not follow the progressive logic of Table 4.4-2 of the Technical Specifications (TS), the small number of defective tubes, compared to the large sample size, has adequately demonstrated the integrity of the OTSG pressure boundaries.
FPC's approach to the sample tube selection and sampling sequence carries the implied assumption that the results of the sa:ple at each stagt would be no worse than C-2 (see TS Table 4.4 2), and would not result in sufficient defective tubes to be C-3.
(A C-3 result would require sampling all of the tubes in the dffected steam generator). This assumption may not be valid as a general rule.
However, the results of Crystal River's examination indicate that the assumption was reasonable in this case, As the steam generators continue in service, how-ever, this assumption becomes less valid.
Since the assumption cannot be proven valid until after testing is completed, TPC should adhere to the progressive logic of the TS in the future.
This cor-pletes our efforts on TAC No. 77031.
Sincerely, (Original signed by)
Harley Silver, Project Manager Project Directorate 11-2 Division of F,eactor Projects - 1/11 Office of Nuclear Reactor Regulation cc: See next page *SEE PREVIOUS CONCURRENCE LA:PDII-2* PM:PDil-2*
1-2 EMCB:NRR* PRAB:NRR*
D;@$
DMiller DDorman:jkd 1 ver CYCheng UBeckner HBer W 05/22/91 05/22/91 g 91 05/21/91 05/22/91 fi/yV91 l
with changes
- CR-3 STEAM GENERATOR noted i o gr%88M 888ljp IMC FIE CErm ggpy i
4 Mr. Percy M. Seard, Jr.
Crystal River Unit No. 3 Nuclear Florida Power Corporation Generating Plant cc:
Mr. A. H. Stephens State Planning and Development General Counsel Clearinghouse Florida Power Corporation Office of Planning and i.'6get I
MAC - ASD Executive Office of the jovernor P. O. Box 14042 The Capitol Butiding St. Petersburg, Florida 33733 Tallahassee, Florida 32301 Mr. P. F. McKee, Director Chairman
-l Nuclear Plant Operations Board of County Commissioners Florida Power Corporation Citrus County P. O. Box 219-NA-2C 110 North Apopka Avenue
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Crystal River, Florida 32629 inverness, Florida 32650 i
Mr. Robert B. Borsum Mr. Rolf C. Widell, Director B&W Nuclear Technologies Nuclear Operations Site Support 1700 Rockville Pike, Suite 525 Florida Power Corporation Rockville, Maryland 20852 P.O. Box 219-NA-21 Crystal River, Florida 32629 Senior Resident Inspector Mr. Gary L. Boldt Crystal River Unit 3 Vice President, Nuclear Production U.S. Nuclear Regulatory Commission Florida Power Corporation 6745-N. Tallahassee Road P. O. Box 219-SA-2C Crystal River, Florida 32629 Crystal River, Florida 32629 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street N.W., Suite 2900 Atlanta, Georgia 30323 Mr. Jacob Daniel Nash Office of Radiation Control Department of Health and Rehabilitative Services 1317.Winewood Blvd.
Tallahassee, Florida 32399-0700 Administrator Department of Environmental Regulation Power Plant Siting Section State'of Florida 2600 Blair Stone Road Tallahassee, Florida 32301 Attorney General Department of Legal Affairs The Capitol Tallahassee, Florida 32304 c.,,-m..,.w_.,