ML15117A280
| ML15117A280 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/13/1995 |
| From: | Wein L Office of Nuclear Reactor Regulation |
| To: | Berkow H Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9501190389 | |
| Download: ML15117A280 (6) | |
Text
o UNITED STATES 4"
NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 January 13, 1995 MEMORANDUM TO: W. Russell B. Grimes Chief, ROS, EDO F. Miraglia B. D. Liaw J. Caldwell A. Thadani B. Sheron Operations Center R. Zimmerman G. Lainas E. Merschoff, RH D. Crutchfield G. Holahan W. Travers M. Virgilio F. Gillespie R. Spessard S. Varga J. Calvo J. Zwolinski D:DRCH J. Roe DD:DRCH E. Adensam THRU:
/1-zHVe rt N. Berkow, Director,<I l..
/3 Project Directorate 11-3 Division of Reactor Projects -
I/II FROM:
Leonard A. Wiens, Senior Project Managerx <
/
44..
-1;31pf Project Directorate 11-3 Division of Reactor Projects -
I/II
SUBJECT:
DAILY HIGHLIGHT - MEETING WITH DUKE POWER COMPANY CONCERNING EMERGENCY ELECTRICAL SYSTEM MODIFICATION - OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 DATE & TIME:
January 19, 1995 1:00 p.m. -
4:00 p.m.
LOCATION:
One White Flint North 11555 Rockville Pike Room 0-16 B-11 Rockville, Maryland 20852 PURPOSE:
To discuss technical, details of a proposed modification to provide over-frequency protection for the Oconee emergency power system.
DEC 2
NRC LCN COPY 9501190389 950113 PDR ADOCK 050002691 F
PDR__
January 13, 1995 PARTICIPANTS*:
NRC DUKE POWER G. Lainas J. Hampton C. Berlinger J. Davis H. Berkow E. Burchfield E. Weiss M. Bailey K. Poertner, RH T. Ledford L. Wiens J. Beckman F. Burrows C. Little Docket Nos. 50-269, 50-270, and 50-287
Enclosure:
Agenda Questions cc:
See next page
- Meetings between NRC technical staff and applicants or licensees are open for interested members of the public, petitioners, intervenors, or other parties to attend as observers pursuant to "Commission Policy Statement on Staff Meetings Open to the Public" 59 Federal Register 48344, 9/20/94.
DISTRIBUTION:
CD.Ic ketEile PUBLIC PDII-2 Reading A. Chaffee, DOPS/OECB OGC, 0-15 B15 E. Jordan, D/AEOD, T-4 D18 Receptionist, OWFN ACRS (4), TWF OPA, 0-2 G5 A. Gody, DISP/PIPB G. Tracy, EDO, 0-17 G21 R. Crlenjak, RH K. Clark, Region II C. Berlinger, 0-7 E4 E. Weiss, 0-7 E4 K. Poertner, RH F. Burrows, 0-7 E4 To receive a copy of this docum nt, indicate in the box: "C" = Copy without attachment/enclosure "E" = o with attachmen /enclosure "N" = No copy OFFICE LA D
RP E
PM: D23: RPE E D:P 23: RPE NAME L
LWi
.cw HBe DATE 95
/
95
/ /95
/ /95
//95 DOCUMENT NAME: G:\\OCONEE\\DPC1-19.MTG
-2 PARTICIPANTS*:
NRC DUKE POWER G. Lainas J. Hampton C. Berlinger J. Davis H. Berkow E. Burchfield E. Weiss, M. Bailey K. Poertner, RII T. Ledford L. Wiens J. Beckman F. Burrows C. Little Docket Nos. 50-269, 50-270, and 50-287
Enclosure:
Agenda Questions cc:
See next page
- Meetings between NRC technical staff and applicants or licensees are open for interested members of the public, petitioners, intervenors, or other parties to attend as observers pursuant to "Commission Policy Statement on Staff Meetings Open to the Public" 59 Federal Register 48344, 9/20/94.
Duke Power Company Oconee Nuclear Station cc:
A. V. Carr, Esquire Mr. Ed Burchfield Duke Power Company CompH ance
.422 South Church Street Duke Power Company Charlotte, North Carolina 28242-0001 Oconee Nuclear Site P. 0. Box 1439 J. Michael McGarry, III, Esquire Seneca, South Carolina 29679 Winston and Strawn 1400 L Street, NW.
Ms. Karen E. Long Washington, DC 20005 Assistant Attorney General North Carolina Department of Mr. Robert B. Borsum Justice Babcock & Wilcox P. 0. Box 629 Nuclear Power Division Raleigh, North Carolina 27602 Suite 525 1700 Rockville Pike Mr. G. A. Copp Rockville, Maryland 20852 Licensing -
ECO50 Duke Power Company Manager, LIS 526 South Church Street NUS Corporation Charlotte, North Carolina 28242-0001 2650 McCormick Drive, 3rd Floor Clearwater, Florida 34619-1035 Dayne H. Brown, Director Division of Radiation Protection Senior Resident Inspector North Carolina Department of U. S.'Nuclear Regulatory Commission Environment, Health and Route 2, Box 610 Natural Resources Seneca, South Carolina 29678 P. 0. Box 27687 Raleigh, North Carolina 27611-7687 Regional Administrator, Region II U. S. Nuclear Regulatory Commission Mr. J. W. Hampton 101 Marietta Street, NW. Suite 2900 Vice President, Oconee Site Atlanta, Georgia 30323 Duke Power Company P. 0. Box 1439 Max Batavia, Chief Seneca, South Carolina 27679 Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 County Supervisor of Oconee County Walhalla, South Carolina 29621
AGENDA QUESTIONS
- 1.
LER 93-01 states that a load rejection test was performed on October 25, 1992, and that the results of that test indicate that calculations used to establish acceptable Keowee operating limits (power, head, number of operating hydro units) are conservative.
Please provide the detail test results and discuss how they validate and relate to the calculations and results discussed in the Duke letter to the staff on January 4, 1995.
Also, during the EDSFI conducted at Oconee, the inspection team was supplied with results from load rejection tests conducted during initial start-up, February 18 to April 15, 1971.
Please discuss how these results relate to the calculations and their results discussed in the January 4, 1995, letter. Discuss results from any other load rejection events or tests.
Duke letter dated January 4, 1995, states that Evaluation KC Unit 1-2 0106 used a bench-marked computer model.
Please discuss what means were used to bench-mark this model.
- 2.
EDSFI inspection report for Oconee raised the issue of possible adverse effects on Keowee auxiliary equipment during overvoltage/overfrequency transients related to Keowee load rejection scenarios (Finding 2).
Duke letter dated November 1, 1994, (on corrective action for EDSFI findings) states that analyses of the overvoltage/overfrequency effects on the Keowee auxiliaries will not be completed until June 1, 1995. Please discuss how satisfactory operation of Keowee auxiliaries following load rejection scenarios is ensured without supporting tests or analyses being available.
Duke letter of January 4, 1995, states that during overspeed transient Keowee output voltage remains relatively constant. Discuss voltage control circuits and any limitations for their operation.
- 3.
LER 93-01 discusses a scenario whereby the Keowee units could trip on overspeed. The LER implies that the setpoint for this trip is 140% of rated speed but no time delay value is discussed. Duke letter of January 4, 1995, implies that the time delay may be 30 seconds but no setpoint for the overspeed is provided. Please provide the specific setpoints and time delays associated with all overspeed trips (normal and emergency) and discuss any corrective action associated with the overspeed trips resulting from the load rejection scenario in the LER.
-2
- 4.
LER 93-01 references FSAR Section 15.14.3.3.6 as containing the requirements that ECCS flow be established within 48 seconds for the LOCA/LOOP scenario. Please provide a detailed discussion (using detailed timelines) of the sequence of events for worse case load rejection/overfrequency scenario which includes the worst case values (considering uncertainties) for undervoltage relay reset, frequency relay setpoints (pickup and reset) and associated time delays, breaker closure times, retransfer startup time delays, etc. Compare this to the worst case sequence for a non-overfrequency scenario to provide the basis for margin between the current FSAR analyses and a worse case load rejection scenario. Discuss any modifications and/or administrative controls that have been or will be implemented that ensure the analysis of FSAR Section 15.14.3.3.6 remains bounding.
- 5.
Duke letter of January 4, 1995, states that overhead circuit parameters were used in lieu of the corresponding underground path parameters.
Please provide detailed justification for the validity of this approach.
- 6.
Discuss the design basis for the Keowee/Oconee units, how commercial operation of the Keowee units fits into the design basis, how the load rejection/overspeed/overfrequency event impacts that design basis, and how the modifications and adminstrative controls ensure that design basis is met.