ML20023D013
| ML20023D013 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 05/13/1983 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8305190020 | |
| Download: ML20023D013 (4) | |
Text
_-
e.
Duxn POWER GOMPANY P.O. Box 33180 CHARLOTTE, N.C. 28242 HAL B. TUCKER Teturnoxe
_=* y="
May 13, 1983 W ') N "
Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: McGuire Nuclear Station Docket No. 50-370
Dear Mr. Denton:
In accordance with Condition 2.C.7.(c) of Facility Operating License No. NPF-17 for McGuire Unit 2, this letter provides a schedule for installation of reactor coolant system cold-leg temperature (T-cold) monitors as an integral part of the Standby Shutdown System (SSS). This modification will be implemented no later than startup following the second refueling outage.
Implementation must coincide with a refueling outage due to work inside containment. Also, allowances have been made for time to receive concurrence from Westinghouse on the final Duke Power design and to procure appropriately qualified equipment. This committed schedule contains conservatism due to substantial uncertainties in the design and procurement schedule estimates.
As required in Supplement 6 of the McGuire Safety Evaluation Report, T-cold indication for at least two reactor coolant loops will be provided in the Standby Shutdown Facility (SSF). Based upon the preliminary design, we plan to provide this instrum:ntation using either:
(1) connectors to transfer the existing T-cold RTD's from the process control system to the SSF readouts, or (2) dual-element RTD's in each reactor coolant loop monitored at the SSF with one RTD element wired to the process control system and the other to an SSF readout.
Since all of the existing T-cold RTD's (1 per reactor coolant loop) are in one channel, an exemption from the cable separation requirements of 10 CFR 50, Appendix R may be needed. A formal request for this exemption will be submitted after detailed design of the modification is sufficiently completed.
Please advise if there are any questions.
Very truly yours,
~d YM DOI Hal B. Tucker REH:jfw 0305190020 830513 PDR ADOCK 05000370 p
- Harold R. Denton May 13, 1983 Page 2 cc:
Mr. James P. O'Reilly, Regional' Administrator U. S. Nuclear Regulatory Commission Region II
-101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 Mr. W. T. Orders URC Resident Inspector McGuire Nuclear Station 4
e DUKE POWER GOMPANY P.O. BOX 03180 CHARLOTrE. N.C. 28242 HAL B. TUCKER TELEPHONE (704) 373-4831 vics,esasorwr May 13, 1983
.Mr.-Harold R. Denton, Director Office of Nuclear _ Reactor Regulation U. S..Naclear Regulatory Commission Washington, D. C.
20555 Attention:
Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: McGuire Nuclear Station Docket No.
50-370-
Dear Mr. Denton:
Condition-2.C.(7).(c) of the McGuire Unit 2 Facility Operating License No.
NPF-17 requires that, prior to exceeding 5% power, a schedule shall be submitted for. installation of source-range neutron flux instrumentation as an integral part'of the Standby Shutdown System (SSS).
In our letter of March 31, 1983, Duke Power requested that the requirement to install thic instrumentation be reconsidered based upon the additional information provided at that time. As a decision by the-NRC on this request is pending, this letter provides ~a provisional schedule fot installing the instrumentation in' the event the NRC decides against our March 31, 1983 request. We believe that providing this provisional schedule satisfies the aforementioned license condition.
If a final decision is made by September 1, 1983 to install the source-range flux instrumentation, we expect to complete the modification no later than startup following the second refueling outage.
Installation must coincide with a refueling outage due to work inside containment. In addition, there are substantial uncertainties associated with equipment procurement schedules.
Furthermore, this schedule will allow the SSS-related modifications to be inte-grated with additional modifications which may be required as a result of reviews related to Regulatory Guide 1.97.
Please advise if there are any questions.
l l
ery truly yours, wxfcP&~
Hal.B. Tucker u
REH:jfw I-i I
- s Harold R. Denton May 13, 1983 Page 2 cc:
Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 M'. W. T. Orders r
NRC Resident Inspector McGuire Nuclear' Station
.