ML16259A236
| ML16259A236 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/27/1990 |
| From: | Wiens L Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| References | |
| TAC-68468, TAC-68469, TAC-68470, TAC-73399, TAC-73400, TAC-73401, NUDOCS 9007310067 | |
| Download: ML16259A236 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 July 27, 1990 Dockets Nos.:
50-269, 50-270 and 50-287 Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company Post Office Box 1007 Charlotte, North Carolina 28201 - 1007
Dear Mr. Tucker:
SUBJECT:
OCONEE UNITS 1, 2 AND 3 - HIGH PRESSURE INJECTION PUMP MOTOR AND REACTOR BUILDING SPRAY PUMP MOTOR OVERCURRENT DURING MOTOR STARTUP SAFETY EVALUATION REPORT (TAC NOS. 68468, 68469, 68470, 73399, 73400 AND 73401)
By Licensee Event Report (LER) 269/87-05 (Rev. 1) dated February 1, 1988, you reported a situation where the high pressure injection (HPI) pump motors could potentially trip on overcurrent if starting during a LOCA/LOOP scenario at the Oconee Nuclear Station. The NRC staff reviewed the event and expressed a concern about low emergency bus voltages and their potentially adverse effect upon the HPI pump motors.
In LER 270/89-06 dated September 5, 1989, you reported that the overcurrent protective relay setting for the reactor building spray (RBS) pump motor (like the overcurrent relay setting for the HPI pump motor) had to be raised so it would not trip during low voltage conditions. Once again, the NRC staff was concerned about a situation (similar to the HPI pump motor) where low emergency bus voltage could have an adverse effect upon an RBS pump motor.
In an effort to resolve our concerns, we requested, in a January 4, 1990, letter, that you provide us with either of the following for both the HPI and RBS pump motors:
(1.)
Motor manufacturer's certification that these motors will start and accelerate to rated speed at the predicted voltage condition for a three-unit LOOP with no adverse effect upon the motors' performance and/or life.
(2.)
Actual low voltage starting test data for the motors which demonstrate that the pump motors will start and accelerate to rated speed at the worst case predicted voltage with no adverse effect upon the motors' performance and/or life.
In response to our request, in letters dated February 21 and March 21, 1990, you provided data and an analysis from the motor manufacturer (Westinghouse) for low voltage operation of the HPI pump motors. Westinghouse stated in 9007310067 900-727 PD R ADIOCK 0500269 S
PFDC F
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9 Mr. H. July 27, 1990 their analysis that the HPI pump motor "will not lock up" at 65% of rated voltage. Additionally, in your March 21 response, you stated that the HPI and RBS pump motors will start and accelerate to rated speed at the predicted worst case voltage conditions with no adverse effect upon the motors' performance and/or life.
We have reviewed your response and conclude that it represents a "manufacturer's certification" which we requested for these motors. On this basis, we consider our concerns related to the low voltage operation of the HPI and RBS pump motors resolved.
This completes our efforts for TAC Nos. 68468, 68469, 68470, 73399, 73400, and 73401.
Sincerely, Leonard A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc: See next page Distribution:.
Docket File F. Burrows NRC & Local PDRs D. Tondi PD 11-3 R/F F. Rosa S. Varga OGC (info. only)
G. Lainas E. Jordan D. Matthews ACRS (10)
L. Wiens Oconee Plant File R. Ingram OFFICIAL RECORD COPY Document Name:
OCONEE SER PUMP OVERCURRENT LA:PDI I4v PM.
lI D:PDII3 RIngram LWiens:sa DMatthews
/
a.s/90
-7 / /0
/
90
Mr. H. B. Tucker Oconee Nuclear Station Duke Power Company Units Nos. 1, 2 and 3 cc:
Mr. A. V. Carr, Esq.
Mr. Paul Guill Duke Power Company Duke Power Company P. 0. Box 33189 Post Office Box 33189 422 South Church Street 422 South Church Street Charlotte, Ncrth Carolina 28242 Charlotte, North Carolina 28242 J. Michael McGarry, III, Esq.
Bishop, Cook, Purcell & Reynolds Mr. Alan R. Herdt, Chief 1400 L Street, N.W.
Project Branch #3 Washington, D.C. 20005 U.S. Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 Mr. Robert B. Borsum Atlanta, Georgia 30323 Babcock & Wilcox Nuclear Power Division Ms. Karen E. Long Suite 525 Assistant Attorney General 1700 Rockville Pike N. C. Department of Justice Rockville, Maryland 20852 P.O. Box 629 Raleigh, North Carolina 27602 Manager, LIS NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 34623-1693 Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 Office of Intergovernmental Relations 116 West Jones Street Raleigh, North Carolina 27603 County Supervisor of Oconee County Walhalla, South Carolina 29621