ML20128E355
| ML20128E355 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 02/04/1993 |
| From: | Oconnor P Office of Nuclear Reactor Regulation |
| To: | Cottle W ENTERGY OPERATIONS, INC. |
| References | |
| TAC-M82595, NUDOCS 9302100388 | |
| Download: ML20128E355 (5) | |
Text
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February 4, 1993
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Docket No. 50-416 Mr. William T. Cottle Vice President, Operations GGNS Entergy Operations, Inc.
Post Office Box 756 Port Gibson, Mississippi 39150
Dear Mr. Cottle:
SUBJECT:
ADEQUACY OF VOLTAGE FOR COMPONENTS IN 125 VDC SYSTEMS - GRAND GULF NUCLEAR STATION, UNIT 1 (TAC NO. M82595)
In Licensee Event Report (LER) 90-012-01 dated January 31, 1991, Entergy stated that several components in Division I and Division-Il 125 Vdc systems might not receive adequate voltage after the loss of their battery chargers.
By letter dated July 13, 1992, the staff requested Entergy to provide the following information:
(1) A list of components that may not receive adequate voltage and their purpose and safety significance.
(2) Justification for the acceptability of below-minimum operating voltage for those components and demonstration that those components will function during the plant's design basis event.
(3) Documentation covering the dedication program which is intended to ensure these components will perform their safety function.
By letters dated August 13, and December 23, 1992, you provided-the requested information.
The staff has completed its review of information provided and concludes that the plant's 125 Vdc systems are adequate based on one or more of the fo'llowing justifications for each component that does not receive manufacturers' minimum recommended voltage per the voltage drop studies:
(1) Some of those components are not required to operate during the time segment when low voltage is present.
(2) Some of those components have voltages calculated by the voltage drop studies that are within a few tenths of a volt of the manufacturers' recommendations.
(3) Some of the components which are required to operate during the design.
basis event are tested every 18 months to verify that the components 9302100388 930204 PDR ADOCK 05000416 m
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r Mr.-William =T. Cottle will function' at voltages at least 10% below their minimum values-calculated _.in the voltage drop studies.
-(4) Indicating lights were all assumed to be incandescent in the voltage drop calculation. Most of the indicating lights in the control: room are neon, which operate at lower voltages than incandescents. Also, in some cases, the lower voltages are present only for a fraction of a second.
For incandescent lights that are expected to receive lower voltages for longer periods, sufficient information is available from other sources.
(5) Some components such as undervoltage relays perform their function when they receive voltages below manufacturers' recommendations.
Also in the your December 23, 1992, submittal, you provided information regarding the-staff's questions concerning possible conflicting documentation.
You also identified proposed changes to Updated Final Safety Analysis Report (UFSAR) pages which will be included in the next scheduled VFSAR update.
'This concludes the staff's review of this issue.
Sincerely, ORIGINAL SIGNED BY:
Paul W. O'Connor, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects - III/IV/V Office of Nuclear' Reactor Regulation cc:
See next page DISTRIBUTION-Docket' File NRC & Local PDRs PD4-1 Reading P. Noonan M. Virgilio J. Roe G. Hubbard PD4-1 Plant-File P; O'Connor ACRS(10)
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will function at voltages at-least 10Wbelow their minimum. values-calculated in the voltage drop studies.
~
i (4): Indicating lights were all-assumed to be incandescent in the voltage
-drop calculation. - Most of the indicating lights in the control room i
are neon, which operate at lower voltages. than incandescents.
Also,.
in some cases, the lower voltages are present only for a fraction of.a second.-- For incandes'*nt lights that are. expected'to receive -lowers voltages for longer periods, sufficient information is available from other sources.
(5) Some components such as_undervoltage relays perform their function-when they receive voltages below manufacturers' recommendations.
Also in_the your December 23,_1992, submittal,-you provided_information:
regarding the staff's questions concerning possible conflicting ' documentation.
You also identified proposed changes to U) dated Final Safety Analysis ~ Report
~a (UFSAR) pages which will be included in tie next scheduled UFSAR update.
This concludes the staff's review of this issue.
Sincerely, ORIGINAL SIGNED BY:
Paul W. O'Connor, Senior _ Project Manager Project Directorate!IV Division of Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation:
cc:
See next page DISTRIBUTION Docket File NRC & Local PDRs' PD4-1[ Reading P. Noonan M. Virgilio.
J. Roe-G..Hubbard
=PD4-1 P1 ant File P.-0'Connor ACRS(10)
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will function at voltages at least 10% below their minimum values-calculated in the voltage drop studies.
(4) Indicating lights were all assumed to be incandescent in the voltage drop calculation. Most of the indicating lights in the control room are neon, which operate at lower voltages than incandescents. Also, in snme cases, the lower voltages are present only for a fraction of a second.
For incandescent lights that are expected to' receive lower voltages for longer periods, sufficient information is available from other sources.
(5) Some components such as undervoltage relays perform their function when they receive voltages below manufacturers' recommendations.
Also in the your December 23, 1992, submittal, you provided information regarding the staff's questions concerning possible conflicting documentation.
You also identified proposed changes to Updated Final Safety Analysis Report (UFSAR) pages which will be included in the next scheduled UFSAR update.
This concludes the staff's review of this issue.
Sincerely, Paul W. O'Connor, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation cc:
See next page a
,e Mr. W. T. Cottle Entergy Operations, Inc.
s_
Grand Gulf Nuclear-Station cc:
Mr. Donald C. Hintz, President Mr. C. R. Hutchinson and Chief Operating Officer GGNS General Manager Entergy Operations, Inc.
Entergy Operations, Inc.
P. O. 31995 P. O. Box 756 Jackson, Mississippi 39286-1995 Port Gibson, Mississippi 39150 Robert B. McGehee, Esquira The Honorable William J. Guste, Jr.
Wise, Carter, Child & Caraway Attorney General P. O. Box 651 Department of Justice Jackson, Mississippi 39205 State of Louisiana P. O. Box 94005 Nicholas S. Reynolds, Esquire Baton Rouge, Louisiana 70804-9005 Winston & Strawn 1400 L Street, N.W. - 12th Floor Alton B. Cobb, M.D.
Washington, D.C.
20005-3502 State Health Officer State Board of Health Mr. Jack McMillan, Director P. O. Box 1700 Division of Solid Waste Management Jackson, Mississippi 39205 Mississippi Department of Natural Resources Office of the Governor P. O. Box 10385 State of Mississippi Jackson, Mississippi 39209 Jackson, Mississippi 39201 President, Mike Morre, Attorney General Claiborne County Board of Supervisors Frank Spencer, Asst. Attorney General Port Gibson, Mississippi 39150 State of Mississippi Post Office Box 22947 Regional Administrator, Region II Jackson, Mississippi 39225 U.S. Nuclear Regulatory Commission 101 Marietta St., Suite 2900 Mr. John P. McGaha Atlanta, Georgia 30323 Vice President, Operations Support Entergy Operations, Inc.
Mr. Michael J. Meisner P.O. Box 31995 Director, Nuclear Licensing Jackson, Mississippi 39286-1995 Entergy Operations, Inc.
P. O. Box 756 Port Gibson, Mississippi 39150 Mr. Rudy Bernhard Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 399 Port Gibson, Mississippi 39150 Mr. K. G. Hess Bechtel Power Corporation P.O. Box 2166 Houston, Texas 77252-2166 l
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