ML20059C384
ML20059C384 | |
Person / Time | |
---|---|
Site: | Mcguire, Catawba, McGuire ![]() |
Issue date: | 10/25/1993 |
From: | Tuckman M DUKE POWER CO. |
To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
Shared Package | |
ML20059C387 | List: |
References | |
RTR-NUREG-1430 NUDOCS 9311010140 | |
Download: ML20059C384 (4) | |
Text
11 I.
9 DukeIbuarCompany MSnuns PO Box 1006 Senior %cePresident Chartone, NC2820N006 NudearGeneration (704)3832200Olkce (704)3824360 Fax DUKEPOWER October 25, 1993 U.
S.
Nuclear Regulatory Commission Washington, D.
C.
20555 Attention: Document Control Desk
Subject:
McGuire Nuclear Station Docket Numbers 50-369 and -370 Catawba Nuclear Station Docket Numbers 50-413 and -414 Technical Specification Change to Reduce Required Minimum Measured' Reactor Coolant System' Flow i
Attached is a proposed revision to the Technical Specifications of the McGuire and Catawba Nuclear Stations, to reduce the required minimum measured reactor coolant systsm flow from 385,000 gallons per minute to 382,000 gpm.
There are two reasons, largely independent of each other, which make this necessary.
Degrading steam generator tubes in McGuire Units 1 and 2, and Catawba Unit 1, have necessitated that tubes be plugged or sleeved, which reduces available flow area in the steam generators and consequently reduces flow through the core.
In addition, a hot leg temperature streaming phenomenon has af fected the ability to accurately measure flow.
The steam generators in the tnree affected units are scheduled to be replaced, beginning in 1995.
Catawba Unit 2 has not experienced the level or rate of degradation that the other three units have,-and this change to reduce required flow is not applicable to Catawba Unit 2.
There are currently no plans to replace the steam generators in this unit.
The flow measurement difficulties caused by the temperature streaming phenomenon will be addressed in a separate submittal.
An additional change in Technical Specification 2.1.1 refers to the Departure from Nucleate Boiling Ratio (DNBR) and centerline fuel temperature as Limiting Conditions for Operation, rather than.a reference to Figure 2.1-1.
These parameters are considered to more accurately reflect the requirements of 10 CFR 50.36. Figure 2.1-1 has also been revised to reflect acceptable operation based on the DNBR limit.
This change is applicable to both units at each of_the two stations.
The change to Technical Specification 2.1.1 is not requisite to, 010040 fN L
9311010140 931025
'd i
rmm w www PDR ADOCK 05000369 f1 P
PDR f;;
1 9
U.
S. Nuclear Regulatory Commission October 25, 1993 Page 2 nor dependent upon, the change to reduce required flow.
Figure 2.1-1, which is referenced by the Specification, was redrawn as a result of the flowrate change; this was considered an opportunity to correct the misleading nature of the figure. The change is consistent with the new Standard Babcock & Wilcox Technical Specifications presented in NUREG-1430.
If, however, this change threatens to impact the review schedule for the portion of this amendment request related to the reduction of required minimum measured 'llow, we will defer our application for the change to Technical Specification 2.1.1, and amend the submittal accordingly.
Approval of this change is requested by the time Catawba Unit 1 begins Cycle 8, currently scheduled for December 24, 1993.
Please note that hardware changes to accommodate revised Overpower Delta-T and Overtemperature Delta-T setpoints will be required when the change to reduce minimum measured flow is approved. Therefore, it is requested that the chmiges be made effective 30 days from the date of issuance; or, for a unit that is shutdown, upon startup.
The marked-up Technical Specification pages are contained in Attachment I, a Justification and Safety Analysis in Attachment II, and a "No Significant Hazards" analysis in Attachment III.
Note that when the changes are
- approved, the Technical Specifications for Catawba Unit 1 will be different from Unit 2 with regard to RCS flow.
The page numbers will be differentiated (e.
g.,
2-A4 for Unit i
vs.
2-B4 for Unit 2),
and the Specifications will be printed on differently colored paper.
By copy of this letter, the States of North Carolina and South Carolina have been notified of the proposed amendment.
If any additional information is required, please call Scott Gewehr at (704) 382-7581.
Very truly yours, QW~
M.
S. Tuckman I
l
- U.- S. Nuclear Regulatory Commission October 25, 1993 Page 3 cc:
Mr. V.
Nerses, Project Manager Office of Nuclear Reactor Regulation U.
S.
Nuclear Regulatory Commission Mail Stop 14H25, OWFN Washington, D.
C.
20555 Mr. R.
E. Martin, Project Manager Office of Nuclear Reactor Regulation U.
S.
Nuclear Regulatory Commission Mail Stop 14H25, OWFN Washington, D.
C.
20555 Mr.
S.
D.
Ebneter, Regional Administrator U.S.
Nuclear Regulatory Commission - Region II 101 Marietta Street, NW - Suite 2900 Atlanta, Georgia 30323 G.
F. Maxwell Senior Resident Inspector McGuire Nuclear Station R. J.
Freudenberger Senior Resident Inspector Catawba Nuclear Station Dayne Brown, Chief Radiation Protection Branch Division of Facility Services Department of Human Services 701 Barbour Drive Raleigh, North Carolina 27603-2008 i
Heyward G.
Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina
'l
'i i
)
U.
S. Nuclear Regulatory Commission October 25, 1993 Page 4 M.
S.
Tuckman, being duly sworn, states that he is Senior Vice President of Duke Power Company; that he is authorized on the part of said Company to sign and file with the Nuclear Regulatory Commission this revision to the McGuire Nuclear Station Facility operating Licenses NPF-9 and NPF-17, and to the Facility Operating Licenses NPF-35 and NPF-52 of the Catawba Nuclear Station;.and that all the statements and matter set forth herein are true and correct to the best of his knowledge.
3
\\ NULW-J M.
S.
Tuckman, Senior Vice President Subscribed and sworn to before me this 25$
day of Odo6co,
1993 0hs W
Notdry ublic My Commission Expires:
.0Au. 22, mb
,