ML20063C269
| ML20063C269 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 04/29/1982 |
| From: | Fiedler P GENERAL PUBLIC UTILITIES CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20063C273 | List: |
| References | |
| NUDOCS 8205040641 | |
| Download: ML20063C269 (1) | |
Text
GPU Nuclear gg gf 100 Interpace Parkway Parsippany, New Jersey 07054 201 263-6500 TELEX 136-482 Writer's Direct Dial Number:
April 29, 1982
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Mr. Dennis M.
Crutchfield, Chief Y
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Operating Reactor Branch #5 27 Y /3 Division of Licensing M
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U.S. Nuclerr Regulatory Commission g g['fy*
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Washington, D.C.
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Dear Mr. Crutchfield:
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Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 Reactor Protection System Power Supply
References:
1.
Letter D. M. Crutchfield to I. R. Finfrock, August 3, 1981 2.
Letter P. B. Fiedler to D. M. Crutchfield, March 24, 1982 Pursuant to your letter of ^ugust 3, 1981, please find enclosed General Electric (G.E.) document NEDO-24317, G.E.
drawing 913E911 Rev. O and Jersey Central Power & Light Co. drawing BR 3013 Rev. 18.
In accordance with G.E.'s recommendation a 100 millisecond time delay shall be provided as part of the protective circuit modification.
A review of the Reactor Protection System (RPS) components indicates that they will not be adversly affected during the duration of the delay.
The time delay will serve to minimize the number of challenges to the RPS as a result of abnormal conditions on the RPS power distribution bus.
If additional information is required, please contact Mr. J.
Knubel at (201) 299-2264.
00/
Very truly yours, 2
hs D,* E -
P.
te 1er Vice President Director-Oyster Creek OUp 1r 8205040641 820429 PDR ADOCK 05000219 PDR p
GPU Nuclear is a part of the General Public Utihties System
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REACTOR PROTECTION SYSTEM PROTECTIVE CIRCUIT UPGRADE DESCRIPTION R. S. De VREUGD I
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NEDO-24317 81NED301 Class 1 January 1981 REACTOR PROTECTION SYSTEM PROTECTIVE CIRCUIT UPGRADE DESCRIPTION R. S. DeVreugd l
Approved:
t'///b Approved:
R
. Brandon, Manager R.
. Gridley Manager N lear Services Engineering Fuel and Services Licensing Nuclear Fuel and Services Safety and Licensing Engineering Department Operation NUCLE AR POWER SYSTEMS DIVISION e GENERAL ELECTRIC COMPANY SAN JOSE, CALIFORNI A 95125 GENER AL $ ELECTRIC
NEDO-24317 IMPORTANT NOTICE REGARDING CONTENTS OF THIS REPORT Please Read Carefully The only undertakings of General Electric Company respecting information in this document are contained in the contract between the plant owner provided with this document and General Electric Company, and nothing contained in this document shall be construed as changing the contract. The use of this information by anyone other than the plant owner, or for any purpose other than that for which it was intended, is not authorized; and with respect to any unauthorized use, General Electric Company makes no representation or warranty, and assumes no liability as to the completeness, accuracy or use-fulness of the information contained in this document.
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NED0-24317 f
CONTENTS Page 1.
INTRODUCTION 1-1 2.
HISTORY 2-1 3.
HARDWARE QUALIFICATIONS 3-1 4.
SYSTEM DESCRIPTION AND APPLICATION 4-1 5.
SPECIFICATIONS 5-1
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5.1 Front Panel Control / Indicators 5-1 5.2 Electrical Requirements 5-1 5.3 Operating Requirements 5-2 5.4 Mechanical 5-2 5.5 Cables 5-2 5.6 Seismic Qualification 5-2 6.
REFERENCES 6-1 I
iii/iv
NED0-24317 ILLUSTRATIONS Figure Title Page 2-1 Existing RPS Protective Circuitry 2-2 I
4-1 New kPS Protective Circuitry 4-2 5-1 Front Panel Control / Indicators 5-3 i
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NED0-24317 1.
INTRODUCTION This report describes the Electrical Protection Assembly (EPA) for plants with Reactor Protection System (RPS) Motor Generator (MG) sets.
The EPA provides redundant protection to the RPS and other essential circuits j
against overvoltage, undervoltage, and underfrequency. The EPA consists of trip components which disconnect circuitry from input power whenever voltage or frequency exceeds their normal tolerances. The unit is Class lE qualified to IEEE standards, l
1-1/1-2 i
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NED0-24317 f
2.
HISTORY Prior to the issuance of the Edwin I. Hatch Unit 2 operating license, the Nuclear Regu'.atory Commission (NRC) identified a concern regarding the RPS instrument MG set.
It was noted that the existing RPS MG protective circuitry was not Class lE.
This fact lead to the conclusion that the system output voltage of 120 volts alternating current (Vac) could be varied sufficiently by a seismic event to cause a failure of the RPS.
Normally, the MG set's output voltage is maintained virtually constant by means of a voltage regulator (see Figure 2-1).
Additionally, overvoltage and under-voltage protective devices isolate the MG's output from the RPS if the voltage exceeds 10% of 120 Vac.
Isolation also occurs if output voltage frequency drops by more than 5%.
The NRC's concern was that the overvoltage, undervoltage, and underfrequency devices were not seismically qualified and could become inoperable, along with the voltage regulator, as a result of a seismic event. The RPS could then receive an out-of-limits voltage supply and thereby sustain damage to the RPS which could prevent a required reactor scram.
The RPS instrument MG set concern applies to all plants where the RPS employs a relay system as opposed to the solid state RPS.
The single exception to this rule is the Limerick plant which derives 'its RPS supply voltage from inverters. The design modification is generic for all affected plants, thus simplifying the review process and facilitating the procurcaent of the addi-tional equipment.
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NED0-24317 3.
HARDWARE QUALIFICATIONS l
Seismically qualified protective circuits for undervoltage, overvoltage, and underfrequency are packaged in an enclosure designed to be wall mounted. Two of these assemblies will be connected in series, between the power source and k
the RPS.
The enclosures will be mounted separately from the MG sets, and separate from each other.
The circuits and enclosures are designed and manu-I factured to General Electric Company specifications.
The enclosures will be located in an area where the ambient temperature will be 40*F to 122*F.
The circuits within the enclosures are qualified to operate up to 137*F at 95% relative humidity. The assemblies are seismically qualified per IEEE-344, 1975, to the Safe Shutdown Earthquake (SSE) and Operating Base Earthquake (OBE). The units are environmentally qualified to the requirements of IEEE-323, 1974.
Enclosure dimensions are 20 inches by 16 inches by 8 inches.
3-1/3-2 L
NEDO-24317 4.
SYSTEM DESCRlPTION AND APPLICATION j
The block diagram shown in Figure 4-1 functionally depicts the addition of the new assemblies to the RPS power supplies. Two assemblies will be connected in I
series to each RPS's power source, including auxiliary power. The protective circuit trip setpoints are plus and minus 10 percent of nominal alternating I
current (ac) voltage and minus 5 percent of nominal frequency.
At installation, voltage measurements will be taken to determine ac line losses between the motor generator set, protective circuits, and downstream components.
The motor generator voltage regulators and the protective circuit trip points will be adjusted to voltage levels that reflect optimal operating conditions for the Reactor Protection System and associated system components.
Protecting the EPA from tripping due to low frequency, overvoltage or under-voltage transients is accomplished by three independent time delays. These variable time delays (from 0.1 to 3.0 seconds) prevent the EPA from immediately tripping with the occurrence of a transient.
Thus, if the transient dissipates prior to tripping the EPA, the EPA remains untripped.
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NEDO-24317 5.
SPECIFICATIONS 1
I 5.1 FRONT PANEL CONTROL / INDICATORS (see Figure 5-1) 5.1.1 Indicators (Test Maintenance)
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a.
Overvoltage b.
Undervoltage c.
Underfrequency d.
Power IN e.
Power OUT 5.1.2 Indicators (Operation)
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Power IN b.
Power OUT 5.1. 3 Controls a.
Main circuit breaker ON/0FF b.
Lockswitch for test maintenance use.
5.2 ELECTRICAL REQUIREMENTS Nominal Voltage Range:
120 Vac (12%)
Current Requirements:
Startup Current:
280 mA for one second Running Current: 250 mA Single Phase: Two Wire (plus ground) 5-1
NED0-24317 Frequency: 50 hertz (Hz)/60 Hz Time Delay: Continuously Adjustable 0.1 to 3.0 seconds I
Circuit Breaker Max Load: 175 amperes ac 5.3 OPERATING REQUIREMENTS l
Temperature: 40*F to 137'F j
Humidity: Up to 95% Relative Radiation: 2x10 RAD, Silcon Total Integrated Dose (TID) Group I 5
2x10 RAD, Silcon Total Integrated Dose (TID) Group II l
l Altitude: 0 - 10,000 feet above sea level.
l 5.4 MECHANICAL Weight:
60 pounds Height:
20 inches Depth:
8 inches Width:
16 inches A hasp and staple are provided for padlocking the EPA enclosure. External feet are furnished for mounting.
5.5 CABLES l
J Cable and conduit access openings to be provided by the user at time of installation.
5.6 SEISMIC QUALIFICATION a.
Operating base earthquake (OBE) 5.0 gravity (G)
I b.
Safe sL tdown earthquake (SSE) 7.0 C c.
Frequency Spectrum 1 to 33 Hz 5-2 l
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ELECTRICAL PROTECTION ASSEMB LY
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Figure 5-1.
Front Panel Control / Indicators 5-3/5-4 1
NEDO-24317 6.
REFERENCES I
l l
General Electric Company Instruction Manual for the Electrical Protection Assembly, Vendor Print File (VPF) 3830-83-6, December 1980.
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l 6-1/6-2
NEDO-24317 DISTRIBUTION Name M/C R. S. De Vreugd (2) 781 K. R. Miller (1) 275 R. A Siemer (1) 740 C. L. Tully (44) 277 l
L. M. Zull (1) 682 NEBG Library (5) 328 VNC Library (2)
V01
NUCLEAR ENERGY DIVISIONS
- GENERAL ELECTRIC COMPANY SAN JOSE. CALIFORNIA 95125 GENER AL h ELECTRIC TECHNICAL INFORMATION EXCHANGE TITLE PACE f
l AUTHOR SUBJECT TIE NUMBER 81 NED 301 R. S. DeVreugd Nuclear Science DATE and Technology January 1981 TITLE GE CLASS Reactor Protection System I
Protective Circuit Upgrade GOV ERNMENT CLASS Description REPRODUCIBLE COPY FILED AT TECHNICAL NUMBER OF PAGES SUPPORT SERVICES, R&UO SAN JOSE, CALIFORNIA 95125 (Mail Code 211) 15
SUMMARY
A description of the Electrical Protection Assembly for plants with Reactor Protection System motor generator sets is presented.
l By aitting out this rectangle and folding in half, the above information can be fitted into a standard card file.
DOCUMENT NUMBER NEDO-24317 INFORM ATION PREP ARED FOR Nuclear Power Systems Division SECTION Nuclear Safety and Licensing Operation K-2121 M AIL CODE 682 BUILOING AND ROOM NUMBER NED-914 (6/77)
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1 GEN ER AL h ELECTRIC u