ML20151H006
| ML20151H006 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 04/11/1988 |
| From: | Gucwa L GEORGIA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| SL-4368, NUDOCS 8804200215 | |
| Download: ML20151H006 (4) | |
Text
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4 Georga Poser Company d
333 Pedmont Avenue
. Manta. Georg a 30308 Te'ephone 404 $26 6506 Mawj Ad@ess Post 0"ce Box 4545 Manta, Geor7a 30302 Georgia Power
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- L T Gucwa tM southem eetnc syvem Manager Nucter Safety i
and L cens ng SL-4368 0839m X7GJ17-V200 April 11, 1988 O. S. Nuclear Regulatory Corc ission ATTN:
Document Control Desk Hashington, D.C.
20555 PLANT V0GTLE - UNITS 1, 2 NRC DOCKETS 50-424, 50-425 OPERATING LICENSE NPF-68, CONSTRUCTION PERMIT CPPR-109 ANTICIPATED TRANSIENTS _HITHOUT SCRAM H0DIFICATIONS Gentlemen:
By letter dated November 18, 1987, Georgia Power Coropany submitted information concerning the ATHS Mitigating Systems Actuation Circuitry (AMSAC) system being installed at Plant Vogtle Units 1 and 2.
In that i
letter it was stated that qualification information for the AMSAC output isolation devices in response to Appendix A of the AMSAC SER would be submitted at a later date.
In accordance with that commitment, the qualifir:ation information provided by Hestinghouse is enclosed.
J This submittd complet6s the plant-specific information re:;uirements of the AMSAC SER for Plant Vogtle.
Please contact this office if you have any questions.
j Sincerely, od*r M_m L. T. Gutwa JH/Im i
Enclosure:
AMSAC Isolation Devices c(w): Georaia P.oy.eLCQmoany i
Mr. P. 0- Rica Hr. G. Eackhold, Jr.
GO-NORMS l
U. S. Nuclear Regulatory Commission
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Dr. J. N, Grace, Regional Administrater Mr. J. B. Hopkins, Licensing Projt!Ct Manager, NRR (2 copies)
Mr. J. F. Rogge, Senior Resident Inspector-Operations, Vogtle
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ENCLOSURE PLANT V0GTLE - UNITS 1, 2 NRC DOCKETS 50-424, 50-425 OPERATING LICENSE NPF-68, CONSTRUCTION PERMIT CPPR-109 AMSAC ISOLATION DEVICES Electrical independence of AMSAC from the existing Reactor Protection System (RPS) is provided through several means for VEGP.
The feedwater flow inputs to AMSAC will be derived from existing non-1E signals within the pror.ess control cabinets.
These signals are provided from non-1E flow transmitters which are routed directly to the control cabinets.
This arrangement does not require the use of existing or new isolators to provide electrical independence of these instrument channels from the existing RPS.
For measuring turbino load at the first stage, GPC has elected to use existing turbine impulse chamber pressure transmitters, transmitter power
- supplies, and isolators associated with the 7300 process protection system.
Class IE powered isolation devices are provided to electrically isolate the protection circuits in the process protection cabinets from control circuits outside the cabinets.
These isolation devices have been tested to demonstrate that they are acceptable for their application as described in HCAP-8892A, "Hestinghouse 7300 Series Process Control System Noise Tests".
The purpose of the tests was to determine whether or not protection circuitry could be perturbated to the extent that protective action would be prevented by the pick-up or prcience of credible interference in control wiring in close proximity to protectiw wiring.
The system was subjected to tests that included magnetic noise, output cable voltage faults (maximum credible voltages:
550 VAC, 250 VDC),
cross talk, and random noise.
The acceptance criteria for these tests were that the postulated fault should not prevent required protective action and that spurious protective action caused by the postulated fault snould be acceptable.
Under all tested conditions the protection circuitry operated as intended.
The tests showed conclusively that electrical interference imposed onto the isolator output wiring (control wiring) is not a consideration as to the proper operation of tha perturbated channel or any adjacent channels.
The recordings verify that the interferences imposed onto the control wirings were not induced into the protection wiring.
The magnitude of the electrical interferences introduced into the system and the stringent test procedures far exceeded any conditions J
0839m E-1 04/11/88 SL-4368 4 775
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ENCLOSURE (Con (inued) 1 AMSAC ISQLA110N DEVICid a
that would be present in actual pknt operations.
Since interferences I
which could be prodJced by AMSAC are bounded by the test conditions, it can be concluded that AMSAC would not interfere with operation of the reactor protection system.
3 Relays are provided at the output of AMSAC for isolating the non-class lE AMSAC circuits from the Class 1E final actuator circuits.
The AMSAC outputs are provider $
from separate relay panels within the AMSAC cabinet.
Separation of the Train A and B circuits within the AMSAC cabinet is achieved through a combination of metal barriers, conduit, and distance.
These-relays have been tested with the maximum credible fault (MN) of 590 VAC applied to the relay coil.
Three tests were conducted.OIn the first test, a strip chart recorder was connected across a nomaUy, closed contact to determine the duration of the relay actuation (10 anyy during application of the fau?t to the relay coil and to measure the resulting induced voltage on the contact, while a digital voltmeter (DVM) was connected-across a normally open contact.
In the second and third tests, the strip chart recorder was connected across a normally closed /ontact while the DVM was connect 0J across a second normally closed dontact.
During all tests, the contacts operated as expected.
Test durations and induced voltages were as follows:
Relav #.
If n _for coil U_ brin opeq DVM ReadiOS Recatd Re>At s li (second u lyqLtil (volts) 1 19.45
$otobserved 0.731 l
2 19.92 0.618 0.774 3
20.40 1.40 1.03?
A The relays clearly demonstrated their isolation caoability by limiting any propagation of the faulteu conditions from the non-1E coil to the 1E contacts to a negligible value.
The induced contact voltage (mhimum of 1.4 volts) is determined to be well below industry standard pickup and dropout voltages for components tyoically utilized in1he plan.t circuits.
Additionally, the SER requires that the isolation devicu ccmply with the seismic qualifications and the environmental qualifications (10CFR50.49) which were the basis for plant licensing.
The iselators provided in the 7300 process protection system 'Mye been seismically qualified.
The qualification of the AMSAC outbut ' solation device has been performed in 0839m E-2 04/11/88 SL-4368 em
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ENCLOSURE (Continued)
AMSAC ISOLATION DEVICES accordance with the curthat Hestinghouse seismic qualification program.
This program has denloped and implemented the requirements of IEEE-344-1975, "IEEE -titanjard for Seismic Qualification of Class 1E Electrical Equipment ' for Nuclear Power Generating Stations" for Hestinghouse suppiled instrumentation and control systems.
The qualification of the AHSAC output relays has been performed for a mild environment through the design / purchase specification and the maintenance / surveillance program as described in FSAR Section 3.ll.B.
The methodology for qualification is contained in WCAP 8587 Rev.
6-A, 4
"MethodcAogy for Qualifying Hestinghouse HRD Supplied NSSS Safety Related Electri'cA1 Equipment.."
It is r'equned tt]at measures be taken to protect the safety systems from electrical inte.*fer:nce (i.e., Electrostatic Coupling, EMI, Crosstalk, etc.) that iuy 'h generated within AHSAC circuitry.
These measures for VEGP are prec.autions in grounding of the AMSAC cabinet and internal circuits. Also, the circuitry is in a free standing cabinet which would contain any generated notu.
The Class IE loads ope.vated by the isolation relay contacts are powered from a Class 1E souVce.
The plant specific details of the wiring configuration cag be found on the GPC elementary drawing if needed.
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