ML13333A377
| ML13333A377 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/15/1979 |
| From: | Haynes J Southern California Edison Co |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-04, TASK-8-4, TASK-RR NUDOCS 7906220358 | |
| Download: ML13333A377 (13) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD.
CALIFORNIA 91770 June 15, 1979 Director of Nuclear Reactor Regulation Attention: D. L. Ziemann, Chief Operating Reactors Branch #2 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Systematic Evaluation Program San Onofre Nuclear Generating Station Unit 1 By letter dated December 8, 1978, you requested information to support the staff in their review of SEP Topic VIII-4, Electrical Penetrations of Reactor Contain ment. The enclosed material is provided in response to your request.
If you have any further questions regarding the enclosed or this topic, please contact me.
Very truly yours, J. G. Haynes Chief of Nuclear Engineering Enclosures 790622055'D
NRC QUESTINS A.
CIRCUIT INFORMATION
- 1.
Identify each circuit which has been selected.
- 2.
Provide the trip curves (current versus time) for the primary and the secondary protection devices.
- 3.
State the maximum short circuit current available to the selected penetration circuit (the short circuit current for AC circuits should be expressed in rms symmetrical amperes with the sym metrical current being initially offset by a DC component.
The short circuit current for direct current circuits should be based on the current having a constant DC value).
- 4. State the size of the conductor(s) for the selected circuit (that is, conductor size external to the electrical penetration)..
B.
ELECTRICAL PENETRATION INFORMATION
- 1. State the manufacturers electrical penetration identification number and provide the size of the conductor(s) in the penetration.
Also provide the rated continuous current for each conductor.
- 2. State the rated short-circuit overload current and the duration of this current.
- 3. Provide a description of all electrical tests for these pen etrations and state the results of these tests.
REQUESTD INFORMATION I.
TYPICAL LOW-VOLTAGE PENETRATION CIRCUIT A. Circuit Information
- 1.
The low-voltage penetration circuit which has been selected is the 480 Volt AC Residual Heat Removal (RHR)
Pump B motor.
- 2.
Figures I-1 and 1-2 provide the trip curves for the primary (Breaker 1222 located on 480V Switchgear No. 2) and the secondary (Breaker 1202 located on 480V Switchgear No. 2) protection devices, respectively.
- 3.
The maximum short circuit current available to the 480V RHR Pump B motor circuit is 27,530 amps asymmetrical.
- 4.
The conductors utilized in the RHR Pump B motor circuit external to the penetration are 3-4/0.
B. Electric Penetration Information
- 1. The manufacturer of the penetration containing the RHR Pump B motor circuit is Amphenol.
The identification number associated with this penetration is WPC-23.
The RHR Pump B motor circuit conduc tors located within the penetration are 3-4/0.
The rated continuous current for this conductor is 188 amps.
- 2.
The rated short circuit overload current for the penetration is 41,300 amps asymmetrical for 30.5 cycles.
- 3.
Short circuit current tests were performed on an Arphenol penetra tion.
The test specimen withstood 41,300 amps rms asymmetrical for 30.5 cycles or an equivalent of 23,400 amps rms symmetrical.
Continuity, dielectric strength and insulation resistance tests were conducted on the test specimen following gama radiation, LOCA environment and short circuit testing.
Results of those tests are as follows:
(a) Continuity: @ 3 amps continuous circuit - Acceptable (b) Dielectric strength:
2200V AC for 1 minute - Acceptable (c) Insulation Resistance: @ 500V DC, 1 X 108 ohms minimum (1) > 1 X 1012 ohms following gamma radiation testing (2) > 2.2 X 1010 ohms following LCA testing (3) 2.0 X 1011 ohms following short circuit testing
Figure I Current in percent of breaker trip unit rating 0
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a a
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a C____
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II.
TYPICAL MEDIUM VOLTAGE PENETRATION CIRCUIT A. Circuit Information
- 1.
The medium voltage penetration circuit which has been selected is the 4160V AC Reactor Coolant Pump (RCP) A motor.
- 2.
Figures II-1 and 11-2 provide the trip curves for the primary (Breaker 11A03 located on 4160V Bus 1A) and the secondary (Breaker 11AO4 located on 4160V Bus IA) protection devices, respectively.
Figure 11-3 provides the trip curve for Breaker 11COl located on 4160V Bus IC.
This breaker would be the secondary protection device during cold startup.
- 3.
The maximum short circuit current available to the 4160V RCP A motor circuit is 43,825 amps asymmetrical.
This maximum momentary short circuit current is available during a cold start when 4160V Bus lA and IC are connected via Breaker 11COl located on Bus IC.
- 4.
The conductors utilized in the RCP A motor circuit external to the penetrations are 6-500 MCM.
B.
Electric Penetration Information
- 1.
The manufacturer of the penetration containing the RCP A motor circuits is L&F Machine Company. The identification numbers associated with the penetrations are JBlAO and JB2AO.
The RCP A motor circuit conductors size located within each penetration are 3-500 MCM.
The rated continuous current for the conductors is 565 amps.
- 2.
The rated short circuit overload current for the penetrations is 45,800 amps asymmetrical for 4 cycles.
- 3.
The following momentary current tests were conducted on a spare L&F Machine Company penetration for San Onofre Unit 1.
Test Bus Symmetrical Current Test Voltage Current Duration No.
(volts)
Phase (amperes)
(cycles)
Remarks Alm 4160 A
7,150 5.9 No distress seen.
B 8,100 5.9 Passed 27-kV d-c.
C 7,600 5.9 high-potential test.
Blm 4160 A
19,500 5.3 No distress seen.
B 19,900 5.3 Passed 27-kV d-c.
C 19,700 5.3 high-potential test.
CIm 4160 A
29,500 4.0 See below.
B 32,000 4.0 C
30,000 4.0 (45,800 asymmetrical)
-2 During test Clm, a loose connection on the external test leads to the C-phase bushing resulted in an external flashover to the canister.
The asynmetrical current on C-phase was 45,800 amperes, and the flashover to the canister occurred about 0.8 cycles after the current was initiated.
The C-phase bushing was cleaned off and the unit passed a 27-kV d-c high-potential test.
As a further check on the penetration, "Ductor" readings were made.
The penetra tion was sent to the manufacturer and a hole was cut in the side.
Inspection of the internal parts showed no damage.
Microhm readings were made and all the three phases showed about 90 microhms.
Figure II-1 10
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Figure 11-2 t-ITYPICAL TIME CURVES TYPE CO-8 L
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III.
TYPICAL DIRECT CURRENT PCWER PENETRATION CIRCUIT A.
Circuit Information
- 1.
The direct current power penetration circuit which has been selected is the Emergency RCP Thermal Cooling Pump motor.
- 2.
The primary protection device (Breaker 72-120 located on 125V DC Bus 1) is a 100 AF/100 AT molded case breaker. Figure III-1 provides the trip curve for the secondary protection device (Breaker 72-143 located on 125V DC Bus 1).
- 3. The maximum short circuit current available to the Emergency RCP Thermal Cooling Pump motor circuit is 5,953 amps asymmetrical.
- 4.
The conductors utilized in the Emergency RCP Thermal Cooling Pump motor circuit external to the penetration are 2-2/0.
B. Electric Penetration Information
- 1.
The manufacturer of the penetration containing the Emergency RCP Thermal Cooling Pump motor circuit is Viking.
The identifica tion number associated with this penetration is EPC-6.
The Emergency RCP Thermal Cooling Pump motor circuit conductors within the penetration are 2-2/0.
The rated continuous current for this conductor is 116.7 amps.
- 2.
The rated short circuit overload current for the penetration is 22,600 amps symmetrical for 3.2 cycles.
- 3.
Momentary current tests were made on two types of test specimens.
One was a two pin sample bulkhead to check the penetration connectors.
The other was a full-scale mock-up penetration to determine the capability of the penetration to withstand short circuit currents and associated forces.
A summary of the momentary current tests on the two pin sample units is shown below:
-2 CONNECIOR TEST CURRENT DURATION SIZE NO.
(AMPERES)
(CYCLES)
REMARKS
- 12 Rlm 1,150 4.2 No damage R2m 1,320 4.5 Nb damage Sim 1,930 1.8 No damage
- 12 TIM 270 1.75 sec. No damage Ulm 270 2.3 min.
lb damage
- 4 Dim 7,000 13.8 No damage Elm 10,000 4.6 No damage E2m 10,400 4.4 Damaged connectors
- 2 Lim 11,300 10.3 Nb damage fn 15,400 4.3 lb damage
- 1/0 Na 14,100 11.0 No damage Oli 18,600 3.3 No damage
- 2/0 Pim 14,900 6.1 No damage QLm 22,600 3.2 No damage
- 4/0 FLm 15,100 1.0 No damage F2m 14,400 5.2 lb damage GCm 18,900 3.2 No damage G2m 21,600 2.0 No damage The damage to connector #4 following test E2m was due to removal of the cable support for this test.
A summary of the momentary current tests on the mock-up penetration is shown below:
CONNECTOR TEST CURRENT EURATION SIZE NO.
(AMPERES)
(CYCLES)
REMARKS
- 12 S4m 2,420 1.8 Nb damage
- 4 E4m 10,000 5.1 No damage
- 2 Mam 15,100 5.3 N'b damage
- 1/0 04m 18,800 5.5 No damage
- 2/0 Q4m 21,400 4.1 Nb damage
- 4/0 G4m 22,400 3.4 lb damage
Figure III-i current in percenit of breakrer trip unit rating 0
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Westingqhou~se Eectric Corporation Assem~bled Switchge" aund Devices Dept.: East Pittsbu~rgh Divisi~on Earta itt sburgh.. Pa.
TRIP COIL 1600A INSTANTANEOUS TRIP 8000A LONG TIME TRIP 1600A TIME 20 SEC. @ 4800A