ML20215G039
| ML20215G039 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/10/1986 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20215G043 | List: |
| References | |
| GN-1226, NUDOCS 8612240227 | |
| Download: ML20215G039 (9) | |
Text
. _ _ _ -.__
Georgia Power Company Pbst Offica Box 282 Waynesboro, Georgi 3 30830 Telephone 404 554 9961 404 724-8114 Southem Company Services,Inc.
Post Office Box 2625 Birmingham, Alabama 35202 Telephone 205 870-6011 Vogtle Project December 10, 1986 Director of Nuclear Reactor Regulation File:
X7BC35 Attention:
Mr. B. J. Youngblood Log:
GN-1226 PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C.
20555 REF: BAILEY (GPC) TO DENTON (NRC), GN-1143, 10/31/86 NRC DOCKET NUMBERS 50-424 AND 50-425 i
CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE ELECTRIC GENERATING PLANT - UNITS 1 AND 2 i
SER OPEN ITEM 14b:
SAFETY PARAMETER DISPIAY SYSTEM (SPDS)
Dear Mr. Denton:
In a conference call on December 1,1986, your staff requested supplemental information to the referenced letter. Attachment A provides the procedure which was used to determine the maximum credible fault (MCF) and sustained overcurrent (S0). Attachment B is the report which documents the MCF and SO testing of the isomate digital isolator board (IDIB).
The conclusion that the IDIB has self-fusing characteristics was based on the j
test results which show that when the MCF was applied on the non-Class lE side of the IDIB, fault current reached 400 Amp de at 0.03 sec. At this instant, the circuit path at the proximity of the non-Class 1E side of the IDIB connector opened and interrupted the fault current. During the S0 test, 7 Amp de was applied on the IDIB and the relay K5 circuit, located farther away from the connector but within the non-Class 1E portion of the board, opened at 0.03 sec and interrupted the overcurrent.
If your staff requires any additional information, please do not hesitate to contact me.
S ncerely, e
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f.O J. A. Bailey
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Project Licensing Manager JAB /caa 0
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Director of Nuclear Reactor Regulation
., File: X7BC35 December 10, 1986
1 Log:
GN-1226 Page 2 i (;
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R. E. Conway NRCkygionalidninistrator R. A. Thomas NRC Resident Inspector J. E. Joiner, Esquire D. Feig R. A. McManus B. W. Churchill, Esquire 4
M. A. Miller (2)
L.,T. Gucwv.o r
B. Jones, Esquire Vogtle Project File G. Bockhold, Jr.
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ATTACHMENT A PROCEDURE WHICH ESTABLISHED THE MAXIMUM CREDIBLE FAULT AND SUSTAINED OVERCURRENT A.
GENERAL:
The Vogtle BOP Isolation Device Panels (IDPs) are used to isolgte Class 1E circuit inputs to the annunciator and/or
,' computer.
The IDPs are furnished by United Controls, Inc.
(formerly Reliance Electric).
These annunciator circuits are designated as project service level "V"
and computer circuits as service level "W"
"V" and "W" cables are routed in the control level trays.
Project criteria further defines that control level cables are 120 VAC or 125 VDC circuits in which the load currents are less than 10 amperes or control circuits with intermittent-loads of less than 70 amperes.
Note that the isomate digital isolator board (IDIB) was tested and passed the following tests:
4 1.
1500 VAC high potential dielectric test.
2.
500 VDC ir.sulation resistance test.
3 IEEE-472 surge withstand capability test.
4.
Environmental and seismic qualification test.
B.
IDENTIFICATION OF CABLES SHARING THE SAME RACEWAY:
Control level trays contain the control cables with service level "S"
(T, U),
"V" and "W".
All the cable information is inputed into the Circuit and Raceway Schedule Program -
EE580.
With the aid of the EE580 computer program, all cables sharing raceways with the IDP output (non-C1ssa 1E) cables and its routing were identified.
4 235/BB
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The' program steps were as follow:
1.'
Use the non-Class 1E IDP electrical location numbers to identify all IDP output cables.
2.
FromEthe--identification cable (ids), establish each cable routing and its respective' raceway.
3 From the raceway ids, gather all the associated cables sharing the same raceway with the IDP output cables.-
-4.
Eliminate all duplicated cable ids.
5.
Print associated cable ids per each IDP location number.
The printed output reports form a complete listing of control level cables sharing raceways with the IDP output cables.
C.
-SIGNAL CHARACTERISTICS - MAXIMUM CREDIBLE FAULT / SUSTAINED OVERCURRENTS.
Since the project criteria limits the control service cable tray to accept cables of 120 VAC and 125 VDC circuits, the IDP output cables are exposed to 120 VAC and 125 VDC only.
The largest AC and DC feeder sharing common raceways with the IDP output cables were identified as follow:
1.
The largest feeder in the 120 VAC distribution system is from MCC panel 1NYF1, breaker 24, rated at 30 amperes.
2.
The largest. feeder in the 125 VDC distribution system is from DC distribution panel 1ND31, breaker 01, rated at 70 amperes.
The two thermal mar,n rte treuit breakers' time-current characteristic curs 5 we.
chen plotted as shown in figure 1.
The value obtained from the curves are as follows:
235/BB i
- 3. 30A CB Ioc=30+ amps at 1000 see IIN=450 amps AC at 1.0 sec
- 4. 70A CB-Ioc=70+ amps at 1000 see IIN=1050 amps DC at 1.0 see Based on this data, the maximum sustained overcurrent is 70 2
amps and the maximum I t for VEGP control level circuit is 1050 amperes which could be applied to the IDIB during a bolted fault caused by a fire event.
D.
CONCLUSION:
From the above analysis, it was recommended that the BOP Reliance IDIB should be tested at sustained overcurrent of 70 amperes and maximum fault current of 1050 amperes, to determine the board's isolation capability.
235/BB
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OISTRIBUTION TO: FOR: REVIEW lNFO.
V0GTLE ELECTRIC JOB NO.
GENERATING PLANT M
- MECHANICAL HVAC EQUIPMENT TAG N0=
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- CONTROL SYSTEMS
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- ELECTRICAL C/6 I
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- HAZARDS b N/I NI$~fI b
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hlGNTION NO.
- CIVIL / STRUCTURAL
- NUCLEAR ACTIVITY NO
- STRESS / PLANT 0ESIGN SYSTEM NO
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b CODES AND STANDARDS CATEGORY NO"
- ARCHITECTURAL
-Q
- STARTUP RETROFITTING REQUIRED YES @ NO e CONSTRUCTION
- NOT REQ'O BY ENGRG j
- CLIENT
- EQUIP. QUALIFICATION
- M & QS
- WESTINGHOUSE 10ENTIFYING TITLE OF THIS 00C8JMENT:
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ACCEPTABLE supo er and does est relieve supplier from feu semplisees with noseesteel ehligations.
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