ML17215A518
| ML17215A518 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 08/06/1984 |
| From: | Williams J FLORIDA POWER & LIGHT CO. |
| To: | John Miller Office of Nuclear Reactor Regulation |
| References | |
| 1-84-198, NUDOCS 8408090096 | |
| Download: ML17215A518 (7) | |
Text
REGULATOR INFORMATION DISTRIBUTION
~TEM (RIDS)
ACCESSION NBR'8008090096 DOC ~ DATE: 84/08/06 NOTARIZED:
NO FACIL:50-389 St. Lucie Plant< Unit 2< Florida Power 8 Light Co.
AUTH;NAME AUTHOR AFFILIATION WILLIAMS'
~ N ~
Florida Power8 Light Co ~
RECIP ~ NAME RECIPIENT AFFILIATION MILLER',R~
Operating Reactars Branch 3
r
SUBJECT:
Forwards, addi info re crack growth rates 5 westinghouse methodology for determ)ning temps for-calculating crack growth rates~in respanse to NRC 800409 requests Info will be included in next FSAR update',
DISTRIBUTION CODE ~
4 0 0 1 S COPIES RECEI VED ~ L'TR ENCL
'IZE ~
TITLE! OR Submittal:
General Distribution NOTES:
OL:04/06/83 DOCKET ¹ 05000389 05000389 RECIPIENT ID CODE/NAME NRR ORB3 BC 01 COPIES LTTR ENCL 7
7 RECIPIENT ID CODE/NAME COPIES LTTR ENCL INTERNAL; ADM~LFMB NRR/DE/MTEB NRR/DL/ORAB NRR/DSI /RAB RGN2 E'XTERNAL: ACRS NRC'DR NTIS 09 02' 0
1 1
1 0
1 1
1 1
6 6
1 1
LPDR NSIC 03 05 ELD/HDS2 NRR/DL DIR ETB REG FILE 00 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 26 ENCL 23
a I
w t
w K
. O. BOX 14000, JUNO BEACH, FL 3340B gr C~M FLORIDAPOWER & LIGHTCOMPANY L-84-l98 August 6, 1984 Office of Nuclear Reactor Regulation Attention:
Mr. James R. Miller,Chief Operating Reactors Branch 83 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Miller:
Re: St. Lucie Unit No. 2 Docket No. 50-389 Turbine Disc tns ection During NRC review of Florida Power & Light Company letter L-84-97, dated April 9, l 984,- additional information was requested.
Attachment I provides the information requested concerning crack growth rates and reinspection intervals.
This information willbe included in the next update to the St. Lucie Unit 2 FSAR.
Attachment 2
provides the information requested concerning Westinghouse's methodology for determining temperatures for the purpose of calculating crack growth rate.
Should you require any further information, please call.
Very truly yours,
. WiIlia Jr.
~
~
~
~
~
Group Vic esident Nuclear E rgy JWW/RJS/cab Attachments 8408090096 840806 PDR ADOCK 05000389 p
/ye)
II g PEOPLE...SER ING PEOPLE
FLORIDA POMER 5 LIGHT COMPANY ST.
LUCIE UNIT 2 rOVnoc~euur I
'RACK GROWTH RATE IN/MONTH REINSPECTION TINE NNTH Rotor TN 8194 oy Klc BORE BORE KEYMAY* INLET BORE EXIT BORE BORE KEYMAY INLET EXIT KEYMAY Disc 1
GOV Disc 2 GOV 84.3 88.0 438 280 324 263 116 126.2 246.6.
185.8 7.458 3.883 4.002 1.904
.1618
.0370
.0496
.02935
.02527 DRY 75.2 79.2
.01496 52.4 66.2 63.6 Disc 1
GEN Disc 2 GEN 84.3 88.0 438 280 324
'63 111.0 127.3 173.8 168.5 3.705 3.196 1.800 1.501
.1377
.0382
.0422
.0303
.02151
.01542 DRY 43.9 41.8 41.9 52.8 48.7 ROTOR TN 8195 Disc 1
GOV Disc 2 GOV 84.3 88.0 438 280 324 263 112.9 129.1 178.4 159.8 3.900 2.872 1.914 1.311
.1451
.04012
.04449
.03181
.02268 DRY 43.8 42.2
.01621 35.8 45.1 40.4 Disc 1 GEN Disc 2 GEN 84.3 88.0 438 280 324 263 115.2 131.5 176.8 169.0 3.830 3.212 1.873 1.511
.1547
.04289
.04743
.03401
.02417 DRY 40.4 38.8
.01733 37.4 47.2 43.59 1.2K>c AcR=~
II x 1.21 p"
2 q
2.3 BORE 1.35 KEYWAY TIME
= /
~
CR P)
(MONTHS) da/dt x 730
-7302
+
0278 3.531 BORE)
I *'Y 4.245 IKKYKAYY g= KEYWAY RADIUS = 0.375
~ACR for the Keyway has the radius subtracted from the calculated value.
Westinghouse-Etectrlc Corporation Power Generation RECEIVF 0 Steam Turbine Generator Oivision The Quadrangle University Boutevard at Nafaya Trail Orlando Florida 3281 7 July 18, 1984 JUL a s t:.84 nuclear Ltcensrrtg Mr. Stan Shepherd Florida Power 8 Light Company P.O.
Box 529100 Miami, Florida 33152
Subject:
St. Lucie Unit tmI2
Dear Mr. Shepherd:
This letter will document a Telecon in which S.
Shepherd (FP8L),
R. Stevens (FP8L),
W. Hazelton (NRC), R; Sells (NRC) and M. Schlatter (Westinghouse) participated.
The purpose of the call was to address concerns which were raised by J. Schiffens review of FP8L's recent FSAR which contained disc inspection interval calculations for the St. Lucie Unit b2.
At issue was the method for determing the appropriate temperatures at a shrunk on disc bore and keyway for the purpose of calculating crack growth rate.
Westinghouse confirmed that we use the disc metal temperature at a point two inches from the disc outlet face to calculate keyway crack growth rate.
Likewise, the temperature at a point two inches from the inlet face is used in the bore crack growth rate expression.
These temperatures are determined on an individual unit basis using the relationships between local steam temperature and disc metal temperature as determined by two dimensional steady state heat transfer analysis.
This procedure is consistant with the convention used to establish the growth rate expressions; i.e., all actual keyway data points used in the regression analysis were assigned
.temperatures corresponding to that two inches from the exit face.
The bore points were treated similarly.
'he significance of selecting the locations two inches from the'isc faces is that these represent the average temperatures of the local areas where cracking had been observed.
0 4
There has been no change in the method of establishing these temperatures since the acceptance of the methodology described in MSTG-1-P "Criteria for Low Pressure Nuclear Turbine Disc Inspection" by the NRC in 1981.
- Regards, J. H. Sturges Customer Project Management Southeast Area cc:
W. Caperton M. Schlatter Miami 00610-PGS
'rlando 00707-205 JHS/ep