ML17347B603

Requests Approval to Use Code Case N-468 at Plants

ML17347B603
Person / Time
Site:	Saint Lucie, Turkey Point
Issue date:	02/27/1990
From:	Goldberg J FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-89-351, NUDOCS 9003140395
Download: ML17347B603 (5)

Text

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ACCESSION NBR~9003140395 DOC.DATE: 90/02/27 NOTARIZED: NO DOCKET I FACIL:50 2'50 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250 50-251 Turkey Point Plant, Unit 4, Florida Power and Light C 05000251 AUTH. NAME AUTHOR AFFILIATION GOLDBERG,J.H. Florida Power & Light Co.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Requests approval to use Code Case N-468 at plants.

DISTRIBUTION CODE: AOOID COPIES RECEIVED:LTR l ENCL ( SIZE:

TITLE: OR Submittal: General Distribution NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 1 1 PD2-2 PD 1 1 EDISON,G 5 5 INTERNAL: NRR/DET/ECMB 9H 1 1 NRR/DOEA/OTSB11 1 1 NRR/DST 8E2 1 1 NRR/DST/SELB 8D 1 1 D

NRR/DST/SICB 7E 1 1 NRR/DST/SRXB 8E 1 1 NUDOCS-ABSTRACT 1 1 B 1 0 S OGC/HDS2 1 0 REG FIL 01 1 1 RES/DSIR/EIB 1 1 EXTERNAL: LPDR 1 1 NRC PDR 1 1 NSIC 1 1 R

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P.O. Box14000, Juno Beach, FL 33408-0420 L-89-351 10 CFR 50.55(a)

FEBRVARY. 2 7 1990 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555 Gentlemen:

Re: St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 American Societ of Mechanical En ineers ASME Code Case N-468 The subject Code Case was approved on March 8, 1989 and was published by ASME July 1, 1989. A copy is attached. In accordance with Article NCA-1140 of the ASME Section III Code, Florida Power 6 Light Company (FP&L) hereby reguests approval from the Commission to use the Code Case at St. Lucie Units 1 and 2 and Turkey Point Units 3 and 4.

Very truly yours, J. H. Goldberg Executive Vice Pre ident JHG/JNB/gmp CC: Stewart D. Ebneter, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, Turkey Point Plant Senior Resident Inspector, USNRC, St. Lucie Plant I

9003140395 900227 PDR ADOCK 05000250 p pNU i(i an FPL Group company

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CASE N-468 CASES OF ASME BOILER AND PRESSURE VESSEL CODE Approval Date: March 8, 1989 See Numeric Index for expiration and any reaffirmation dates.

Case N-468 A= the design basis zero period ground acceler-Alternate Method of Earthquake Description for ation defined for the site.

Class 2 and 3 Piping at Low Seismicity Sites W= weight of the component expressed as 1.0g m Section III, Division 1 where g is the acceleration of gravity and m is the mass of the piping.

K=d K, Inquiry: What alternatives to the Earthquake De- K, = a coefficient which accounts for the shape of scription (loads) given in Section III, Division 1, Ap- the applicable design ground and amplified or pendix N, para. N-1210 are acceptable for use in earth- floor response spectra used to define a generic quake analysis of Class 2 and 3 piping at low seismicity or site specific seismic design basis. The factor sites? Low seismicity sites are defined as sites which Ki on a site specific basis is chosen such that have Safe Shutdown Earthquake zero period ground the mean values of the piping moments and accelerations equal to or less than 0.15g. support reactions are within 25 percent of the largest moment or reaction on a system using the simplified load coefficient method are Reply: It is the opinion of the Committee that for equal to those determined from response spec-Section III, Division 1, Class 2 and 3 construction that tra modal analysis, RSMAM, at the site.

a simplified load coefficient method may be used to d = 1.2 (for moments in the piping system) and describe equivalent static earthquake loads on piping 1.0 (for reaction loads) at low seismicity sites as follows: These design margins provide at least a 20

= KAW percent additional margin for the standard Ept problems when the simplified LCM is used.

where The difference value of d for moments versus Frt= total force applied to mass distribution of the reaction loads are due to the observed con-system in the ith x, y, or z global direction. sistent conservatism in the ratio of RSMAM/

In general, three directions of external forces, LCM results for reaction loads of approxi-one vertical and two horizontal (nominal E- mate 75 percent as compared to the ratio of W and N-S), will be used in developing the RSMAM/LCMmoment results in the "stan-resultant forces, moments, and reactions in dard" piping systems.

the local 1, 2, or 3 corrdinate system of the The equivalent static load defined herein is the inertia piping. These resultant separate forces, mo- component of earthquake load. Earthquake loads re-ments, and reactions will then be combined sulting from seismic anchor motion are not included.

on the SRSS basis to account for independence This Case number shall be shown in documentation of seismic input directions. on the Code Data Report when this method is used.

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