ML18018B572
| ML18018B572 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 02/20/1984 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NLS-84-072, NLS-84-72, NUDOCS 8402280407 | |
| Download: ML18018B572 (4) | |
Text
REGULATORY I.
RMATION DISTRIBUTION SYS (RIDS)
ACCESSION NSR;8002280007 DOC.DATE: 80/02/20 NOTARIZED:
NO
>>>>'OCKET 0
FACIL!50 400 Shearon Harr is Nuclear Power PlantE Unit 12 Carolina 05000400 AUTH~ NAME AUTHOR AFFILIATION MCDUFFIE/M'DA.
Carolina Power L Light Co+
RECIP,NAME RECIPIENT AFFILIATION DENTONiH~ R<
Office of Nuclear Reactor Regulationi Director
SUBJECT:
. Responds to request for addi info re insp intervals on low pr'essure t'urbine rotors. New partial integral rotors purchased 8 undergoing evaluations One half cr.itical crack depth for shrunkon discs exceeds 50 yrs.
DISTRIBUTION CODE$
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SERIAL:
NLS-84-072 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO.
1
DOCKET NO. 50-400
RESPONSE
TO REQUEST FOR ADDITIONAL INFORMATION MATERIALS ENGINEERING BRANCH
Dear Mr. Denton:
In response to a request by Mr. J.
O. Schiffens (Materials Engineering Branch)
Carolina Power
& Light Company (CP&L) hereby submits additional information relative to the inspection intervals on Shearon Harris Nuclear Power Plant (SHNPP) low pressure turbine rotors.
Carolina Power
& Light Company (CP&L) has recently purchased new partial integral rotors and is currently in the process of evaluating them.
We expect these new rotors to perform better than rotors previously planned for SHNPP, especially as regards to rotor disk keyway cracking.
As requested by the reviewer, calculations have been completed to determine the minimum time required to reach one-half critical crack depth for the "shrunk-on" discs.
Preliminary results indicate that the minimum time required to reach one-half critical crack depth is in excess of fifty (50) years (calculated per Westinghouse MSTG-1-P Alternate Method).
If you have further questions or require additional information, please contact our staff.
Yours very truly, JHE/cfr (8502NLU)
M. A. McDuffie Senior Vice President Nuclear Generation cc:
Mr. B. C. Buckley (NRC)
Mr. J. 0. Shiffigens (NRC)
Mr. G. F. Maxwell (NRC-SHNPP)
Mr. J.
P. O'Reilly (NRC-RII)
Mr. Travis Payne (KUDZU)
Mr. Daniel F.
Read (CHANGE/ELP)
Chapel Hill Public Library Wake County Public Library 84022280407 840220 PDR ADOCK 05000400,,
G.
D Mr. Wells Eddleman Dr. Phyllis Lotchin Mr. John D. Runkle Dr. Richard D. Wilson Mr. G. 0~ Bright (ASLB)
Dr. J.
H. Carpenter (ASLB)
Mr. J. L. Kelley (ASLB) 411 Fayettevllle Street o P. O. 8ox 1551 o Raleigh, N. C. 27602
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