ML19350D518
| ML19350D518 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/10/1981 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Hancock J FLORIDA POWER CORP. |
| References | |
| NUDOCS 8104160148 | |
| Download: ML19350D518 (4) | |
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UNITED STATES y)i#(
g NUCLEAR REGULATORY COMMISSION
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WASHINGTO N. D. C. 20555 o
hj.....f April 10, 1981 i
Docket No. 50-302 e\\
'O Mr. J. A. Hancock 8
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/Sg7 Director, Nuclear Operations t
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A Florida Power Corporation g
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P. O. Box 14042, Mail Stop C-4
Dear Mr. Hancock:
' -f\\Dg St. Petersburg, Florida 33733 I
SUBJECT:
DEGRADED GRID VOLTAGE During our review of your submittal of December 22, 1980 regarding degraded grid voltage we detemined that additional information was needed. The additional information that we need is identified in Enclosure No.1.
Please respond within 45 days of the date of this letter.
- Sincemly, l
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.' v John F. Stolz, Chie erating Reactors Branch #1 Division of Licensing Enclosure :
Request for Infomation on Degraded Grid Voltage cc w/ enclosure:
See next page I
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o Crystal River Unit No. 3 50-302 Florida Power Corporation cc w/ enclosure (s):
Mr. S. A. Brandimore Mr. Robert B. Borsum Vice President and General Counsel
~ Babcock & Wilcox P. O. Box 14042 Nuclear Power Generation Division St. Petersburg, Florida 33733 Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Mr. Wilbur Langely, Chairman Board of County Commissioners Mr. Tom Stetka. Resident Inspector Citrus County U.S. Nuclear Regulatory Commission Iverness, Florida 36250 Route !3. Box 717 Crystal River, Florida 32629 U. S. Environmental Protection Agency Region IV Office Mr. Dan C. Poole ATTN: EIS COORDINATOR Nuclear Plant Manager 345 Courtland Street, N.E, Florida Power Corporation Atlanta, Georgia 30308 P. O. Box 219 Crystal River, Florida 32629 Director, Criteria and Standards Division Office of Radiation Programs (ANR-460)
U. S. Environrental Protection Agency Hashington, D. C. 20460 sutaau of Intergovernmental Relations 660 Apalachee Parkway Crystal River Public Library Tallahassee, Florida 32304 668 N. W. First Avenue Crystal River, Florida 32629 Mr. J. Shreve The Public Counsel Room 4 Holland Bldg.
Tallahassee, Florica 32304 Administrator Department of Environmental Regulation Power Plant Siting Section State of Flcrida 2600 Blair Stone Road Tallahassee, Florida 32301 Attorney General Department of Legal Affairs The Capitol Tallahassee, Florida 32304 Dr. William R. Stratton Los Alamos Scientific Lab Box 503 Los Alamos, New Mexico 87544
Enclosure CRYSTAL RIVEP 3 Docket No. 50-302 REQUEST FOR ADDITIONAL INFORMATION ON DEGRADED GRID PROTECTICN FOR CLAS! IC P0h'ER SYSTEMS References Florida Power Corporation (FPC) letter, P. Y. Gaynard to Division of a.
Licensing, NRC, " Adequacy of Station Electric Distribution Systems Voltages", December 22, 1980.
b.
NRC generic letter to all Power Reactor Licensees, " Staff Position Rela-tive to the Emergency Power Systems for Operating Reactors", June 6,1977.
3 The FPC response to item 8 stated:
It is proposed to keep the existing undervoltage relays at their present setpoint of approxipately 555.
It is further proposed that a second set of undervoltage relays be added to the 4160V ES buses.
These relays would be solid state - in-stantaneous relays which would be set to trip at 90% voltage. A totcl time delay of 10 seconds would be used before the 90~ voltage level would initiate transfer to the diesel generators.
The schedule for completing the engineering package for effecting this enange would be approximately April 1,1981.
The actual equipment change could be per-formed during the refueling outage presently planned for Fall 1931, provided equipment, deliveries could be met.
The existing undervoltage scher.c will still be used for initiating a dead bus l
transfer to the diesel generators.
This proposal, in principle, is acceptable.
However, we need further details on your design as previously requested in reference b.
5 1.
Verify that the selection of the voltage and time setpoints were deternined from your analysis 3 of voltage requirements of the class lE loads at all distribution system voltage levels.
2.
Verify that the voltage protection includes coincidence logic to prevent l
spurious trips of offsite power.
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3.
Verirv that tne time delay on the secnnd-levo' undtevoltage relay Icgic a) daes not exceed the taximum time delay that is assured in :na FS;r.
accident analysis (including ciesel : tarting time).
b) minimizes the effect of short-duration disturbances reducir.g the availability of the offsite power sources.
c) does not result in failure of safety systems or coiaponents.
4 Verify that tne voltage monitors autom.atically initiate the disconnecti'on of offsite pcwer sources whenever the voltage setpoint and tine-delay limits have been exceeded.
5.
Verify that the voltage monitor design satisfics the requirements, of IEEE std 279-1971.
6.
Supply preliminary proposed technical specifications in accordance with the -
model technical specificationsD.
These should include limitinc conditions of operation, trip setpoints, with upper ind icwer limits and allowable time delays.
7.
These same ta:nnical specifications should include the testing requirements to demonstrate the ful operability and independence of the onsite povier 1
sources per position 3D.
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