ML20138F097
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.s NUCLEAR REGULATORY COMMISWON waseameron.o.c.mma m
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'POUWEXM TO:
Frederick J. Hebdon. Project Director i
Project Directorate II-3 i
Division of Reactor Projects. I/II t
FRCH:
Keith R. W1chman. Chief Material Integrity Section I f Materials and Chemical Engineering Branch 1
N Division of Engineering
!l StBJECT:
ST. LUCIE LMITS 1 AW 2 EVAllRTION OF PTS OF REACfCR VESSEL j
BELTLINE MATERIALS Plant Name:
St. Lucie Units 1 and 2 Licensee:
Florida Power & Light Company l
t, Re1ewSkatus:
By letter dated May 14. 1996, the licensee s@mitted pressurized thermal shock i
(PTS) evaluations for E C review and approval. These evaluations contain the licensee *s determination of the projected reference temperature. RT i
for the reactor vessel beltline materials of each unit. Also inclub, values as part l
of the submittal was Coeustion Engineering (beers Grote (CEOG) remrt i
CEN 405 P. Revisim 2 "Apg11 cation of Reactor Vessel Surveillance )ata for i
Ent>rittlement ManvAment.
The licensee requested that the report be withheld j
from p@lic disclosure. The proprietary determination is a separate issue from the PTS assessment.
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I CEOG report CEN 405 P. Revision 7 presents tw approaches for CE omers to agly Regulatory Position 2.1 of Regulatory Guide (RG) 1.99. Revision 2 Wen
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tie limiting material of the vessel is not in the surveillance program, and i
the surveillance data meet the remaining four RG credibility criteria. The integrated surveillance approach would use limiting material data from another CE fabricated host vessel after determining the similarity of that vessel to i
the, subject vessel (i.e. similari of irradiation environment). The margin i
reduction approach would use the ant specific surveillance data to reduce the margin to be added to the 1cted shift.
r A511 cation of the margin reduction approach would require an exemption from t1e PTS rule. The current rule irir.cipriates the five credibility criteria of i'
RG 1.99. Revision 2. The first criterion states that
- Materials in the capsulesJ hould M hos most likely to be controlling with regard to f
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i CONTACT:
A. Lee. MR NRC HLE CENTER CO
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radiation embrittlement acording to the reconnendations of [RG 1.99.
Revi:1on 2]."
The licensee's ap> roach proposes that the credibility of the surveillance data be determined )y evaluating it using only four of the l
criteria.
i The integrated surveillance approach would be allo d by the PTS rule.
In order to apply this approach a licensee would need to confirm that the material in the host surve111ance program is equivalent to the controlling
- 4 material in their vessel. This method involves several plant specific i ;
considerations. Therefore, approval of a generic topical report for a method that would need to be reviewed on a case-by-case basis could lead to situations where licensees may not be able to effectively reference CEN 405 P.
j Revision 2.
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The review is currently on hold until the proprietary issue is resolved. The l
submittal is a priority 3 (long term action) Item. Once the pro)rietary issue is resolved, the staff will determine how the review of the St..ucie thits 1 and 2 PTS assessment will proceed in light of the issues raised regarding the j
CEOG report CEN 405-P. Revision ~2.
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'bcket Nos.: 50 M 336
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. radiatton embrittlement according to the recomendations of [RG 1.99.
Revision 2)."
The licensee's ap> roach proposes that the credibility of the surveillance data be determined )y evaluating it using only four of the j
criteria.
The integrated surveillance approach. would be allowed by the PTS rule.
In i
order to apply this approach a licensee would need to confirm that the material in the host surveillance program is equivalent to the controlling mater 16i in their vessel. This method involves several plant specific considerations. Therefore, approval of a generic topical report for a method that would need to be reviewed on a case by-case basis could lead to situations Wre licensees may not be able to effectively reference CEN-405 P.
l Revision 2.
i s
The review is currently on hold until the proprietary issue is resolved. The submittal is a priority 3 (long term action) Item. Once the pro)rietary issue is resolved, the staff will determine hw the review of the St.
.ucie thits 1 and 2 PTS assessment will proceed in light of the issues raised regarding the i
CE0G report CEN 405 P. Revision 2.
i Docket Nos.: 50 4t$ 336 cc:
J. Strosnider L. Wiens DISTRBUTION:
.-Central Files EMCB RF/PF Glainas BSheron G:\\ LEE \\STLUCIE.MEM To receive a copy of this document. Indicate th the box C-Copy w/o attachment / enclosure E-Copy with ettechnent/ enclosure N = No copy 0FFICE DE:EMCB DEjEM/
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