ML20128A360
| ML20128A360 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/26/1993 |
| From: | Durr J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Opeka J NORTHEAST NUCLEAR ENERGY CO. |
| Shared Package | |
| ML20128A364 | List: |
| References | |
| NUDOCS 9302020200 | |
| Download: ML20128A360 (3) | |
See also: IR 05000245/1992030
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Docket Nos. 50-245
50-336
50-423
Mr. John F. Opeka
Executive Vice Preaident - Nuclear
Northeast Nuclear Energy Company
P.O. Ibx 270
liartford, Connecticut 06141-0270
Dear Mr. Opeka:
SUnJECT: INSPECTION REPORT NOS. 50-245/92-30,50-336/92-32, AND 50-423/92-29
This letter refers to the inspection of engineering and technical support activities conducted -
during the period November 16-20,1992, at Berlin and Waterford, Connecticut by
Mr. A. Lohmeier. The inspection related to the retention of records for those facility
components designed for a limited number cf transients or cycles at Northeast Nuclear
Energy Company Millstone Nuclear Power Station Units No.1,2, and S.
Mso included in
the inspection was the response of Northeast Nuclear Energy Company in providing the
required information of Generic Letter 92-01 relating to reactor vessel belt-line material-
adequacy expressed in 10 CFR 50 Appendices G and H. Mr. Imhmeier discussed the results
of the inspection with members of the Northeast Utilities Nuclear Energy Company
engineering and licensing staff at the inspection exit meeting on November 20,1992.
Further telephone discussion with the Northeast Nuclear Energy Company engineering staff
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on December 18,1992, provided additional information and clarification related to-
operational cycle monitoring sufficient to complete the inspection on that date.
The monitoring of transients or cycles over the lifetime of components designed for a limited
number of cycles is important to the safety assessment of equipment during and beyond the
expected facility lifetime. Our inspection revealed both strengths and weaknesses in
Northeast Nuclear Energy Company programs to monitor cyclic operation. Inspection of
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Millstone Unit 3 revealed a system in place for tracking the numbers of operational cycles
and transients. On Millstone Units 1 and 2, however, there was found no system to convert
records of transient or operational cycles to the fatigue life assessment of components
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designed for a limited number of transient or cycles. While the operational data was
recorded in accordance with Technical Specificationn Section 6.9.1.6, the data had not been
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JAff 2 61993
Mr. John F. Opeka
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applied toward assessment of fatigue life of components since 1982. Furthermore, on
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Millstone Unit No.1, on the basis of calculations performed in 1982, estimates of present
fatigue life usage factor approach the allowable value of 1.0 for the reactor basin seal skirt.
The inspector found that Northeast Nuclear Energy Company engineering is considering
installation of a computerized system for transient cycle monitoring in 1993, that would
provide for monitoring and evaluation oi components designed for a limited number of
transients or cycles on Millstone Units 1 and 2.
In discussion of this matter with members -
of your engineering department on December 18,1992, it was requested that Northeast
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Nuclear Energy Company engineering provide analytic justification that the design of the
reactor basin seal skirt of Millstone Unit I will not reach end of fatigue life during the
anticipated life of the facility. This issue will be considered as an unresolved item.
Sincerely,
Oristml sicnea tyr
sectue y,D n
Jacque P. Durr, Chief
Engineering Branch
Division of Reactor Safety
Enclosure: NRC Region I Inspection Report Nos. 50-245/92-30, 50-336/92-32, and -
50-423/92-29
cc w/ encl:
W. D. Romberg, Vice President - Nuclear, Operations Services
S. E. Sede, Vice President, Millstone Station
H. F. Haynes, Nuclear Unit Director
R. M. Kacich, Director, Nuclear Licensing
D. O. Nordquist, Director of Quality Service:
Gerald Garfield, Esquire
Nicholas Reynolds, Esquire
J. S. Keenan, Nuclear Unit Director
C. H. Clement, Nuclear Unit Director
K. Abraham, PAC (2)
Public Document Room (PDR) .
Local Public Document Room (LPDR)
Nuclear Safety Information Center (NSIC)
NRC Resident Inspector
State of Connecticut SLO
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bec w/ encl:'
Region I Docket Room (with concurrences)
R. Blough, DRP
E L. Docrflein, DRP
W. Raymond, SRI, Haddam Neck
P. Swetland, SRI, Millstone
V. McCree, OEDO
DRS/EB SALP Coordinator
R. Barkley, DRP
J. Strosnider, NRR
R. Parkhill, NRR
R. Kirkwood, RES
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