ML20207H792
| ML20207H792 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 07/15/1986 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20207H796 | List: |
| References | |
| GN-997, NUDOCS 8607250097 | |
| Download: ML20207H792 (6) | |
Text
l Georgia Power Company
. Post Offic3 Box 282 Waynesborn Georgia 30830 Telephone 404 554-9961 404 724-8114 Smthem Cbmpary Services. inc Pbst Office Ebx 2625 Birmingham, Alabama 35202 Telephone 205 870-6011 VOgtie Project July 15, 1986 Director of Nuclear Reactor Regulation File: X7BC35 Attention:
Mr. B. J. Youngblood Log:
GN-997 PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C.
20555 REF.: YOUNGBLOOD TO FOSTER, DATED 11/26/85 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE ELECTRIC GENERATING PLANT - UNITS 1 AND 2 SER OPEN ITEM 14:
CONTROL ROOM DESIGN REVIEW
Dear Mr. Denton:
Attached is the information requested by your staff in the referenced letter.
The attachment contains information concerning the isolation devices used in the VEGP safety parameter display system.
If your staff requires any additional information, please do not hesitate to contact me.
Sincerely,
. f.
J. A. Bailey Project Licensing Manager JAB /caa Attachment xc:
R. E. Conway NRC Regional Administrator R. A. Thomas NRC Resident Inspector J. E. Joiner, Esquire D. C. Teper B. W. Churchill, Esquire W. C. Ramsey M. A. Miller (2)
L. T. Gucwa B. Jones, Esquire Vogtle Project File G. Bockhold, Jr.
0Y 0
0592V 8607250097 860715
, i PDR ADOCK 05000424 E
Attachment RESPONSE TO NRC REQUEST FOR INFORMATION ON SPDS ISOLATION DEVICES a.
For the type of device used to accomplish electrical isolation, describe the specific testing performed to demonstrate that the device is acceptable for its appli-cation (s). This description should include elementary diagrams when necessary to indicate the test configuration and how the maximum credible faults were applied to the devices.
Response
1)
BOP Isolation Devices (Optical Isolators):
Isolation devices for SPDS are the Reliance Electric Company Isomate digital isolation system and is located in the isola-tion device panel.
Barrier panels built into the panel pro-vide front to rear separation between Class 1E and non-Class 1E wiring compartments.
A 5-inch air gap formed by the barriers separates the two compartments.
As part of the isolation device panel environmental qualification program, 1500 V de of high potential dielectric test (refer to ), 500 V de of insulation resistance test (refer to Enclosure 1) and IEEE 472 surge withstand capability test (refer to Enclosure 2) were performed.
The surge withstand capability test wave specified in IEEE 472 is an oscillatory wave, frequency range of 1.0 MHZ to 1.5 MHZ, voltage range of 2.5 KV to 3.0 KV crest value of the half cycle peak, envelop decaying to 50% of the crest value of the first peak in not less than 6 micro seconds from the start of the wave.
The 1500 V de of high potential test voltage was applied for one minute between all inputs tied together and all outputs tied together as shown on Figure 1.6.3.b of Enclosure 1.
The 500 V de of insulation resistance test was applied to outputs of the isolation device as shown on Figure 1.6.3.b of.
The surge withstand capability test wave was applied to the isolation devices in accordance with IEEE 472 as described in.
1
]
2)
NSSS Analog-Isolation Devices:
Specific testing performed for each isolation device is listed below:
-Qualification Test Report Applicable Model No.
Documentation j
NSSS WCAP-8892A 2837A12G01 (NLP Group 1 Card)
ESE-13 Analog
.2837A12G02 (NLP Group 2 Card)
Isolators-2837A12G03 (NLP. Group 3 Card) 2837A14G04 (NSC Group 4 Card)
,i b.
Data to verify that the. maximum credible faults applied during the test were thb maximum voltage / current to which the device could'be exposed, and define'how the maximum voltage /-
current'was determined.
' Response 1)
BOP Isolation Device (Optical IsorOtor):
The non-Class 1E wiring emanating.from the isolation devices extend beyond the equihm9nt panels and are separated from the high energy power cable'.s.by_ routing these cables through control level raceways. 'The cables in the control level raceways are rated 600 V, qualified for the IEEE 383 flame i
resistance test and operated at 120 V ac or 140 V dc (battery charger overvoltage trip setting) or less.
The non-Class 1E 1l' cables of the B0P Isolation Devices for the SPDS carry 48 V/125 ma signal.
Therefore, the test voltages applied during the high pot. test, insulation resistance test, and j
surge withstand capability test envelop the maximum voltage in which the isolation device could be exposed to.
}
2)
NSSS Analog Isolation Devices:
l WCAP-8892A describes the testing configurations used, parameters selected, and how the maximum voltage / current was j
determined.
c.
Data to verify that the maximum credible fault was applied to the output of the device in the transverse mode (between sig-nal and return) and other faults were considered (i.e.,
open and short circuits).
2
/
Response
- 1) B0P Isolation' Devices (Optical Isolators):
The surge withstand capability test wave described in item a above was applied to the output of the isolation device in
'the transverse mode test as shown in Enclosure 2.
'Other faults such as open and short circuits are not necessary to be considered because the condition of open and short cir-cuits in the non-Class 1E circuits (dry contact circuits) of the isolation devices is the same condition as normal operat-ing condition of the isolation device.
2)
NSSS Analog Isolation Devices:
Refer to WCAP-8892A for the test configuration.
d.
Define the pass / fail acceptance criteria for each type of device.
Response
1)
BOP Isolation Devices (Optical Isolators):
1500 V de high potential dielectric test, 500 V de insulation resistance test and IEEE 472 surge withstand capability (SWC) test were performed to verify that the device will perform its safety-related function when subjected to these conditions:
o High Potential Dielectric Test The device is tested as shown on Enclosure 1, Figure 1.6.3.b and a 1500 V de voltage is applied for a duration of one minute.
There should be no failure indicated by the test equipment (the high potential tester should not trip).
o Insulation Resistance Test (Megger Test)
The device is tested as shown on Enclosure 1, Figure 1.6.3.b and a 500 V de voltage is applied.
The insulation resistance should not be less than 50 mega ohms.
o Surge Withstand Capability (SWC) Test The device must withstand the test without damage and must remain functional as specified in IEEE 427.
3
/
/
2.
NSSS Analog Isolation Devices:
Refer to WCAP-8892A for pass / fail criteria.
e.
Provide a commitment that the isolation devices comply with the environment qualifications (10 CFR 50.49) and with the seismic qualifications which were the basis for plant licensing.
Response
- 1) BOP Isolation Devices (Optical Isolators):
The BOP isolation devices are tested in accordance with the project's environmental (Appendix EA) and seismic (Appendix QG) requirements.
Environmentally, the test results shows that the iso.'.ation devices panel and its components can withstand the environmental service conditions during its qualified 41 years life established in Appendix EA.
This compliance is documented in Section 8 of Enclosure 3, " Isolation Device Panel Environmental & Seismic Qualification Report."
Seismically, the isolation device panels and their components can withstand the seismic environment established in Appendix QG without compromising its structure and electrical functions. This compliance is documented in Appendix H of Enclosure 3.
- 2) NSSS Analog Isolation Devices:
The isolation devices do comply with the environmental and seistic qualifications as discussed in the applicable qualification documentation (ESE-13),
f.
Provide a description of the measures taken to protect the safety systems from electrical interference (i.e., electrostatic coupling, EMI, common mode and crosstalk) that may be generated by the SPDS.
Response
The safety signals that interface with the SPDS are all terminated at the ERF computer. They are either digital B0P, analog NSSS, both isolated and tested as described above or NSSS digital. The SPDS, the isolation device panel, (B0P), the 7300 system cabinets (NSSS) and the ERF computer are located in the control room area where there are no high energy devices or circuits to generate significant EMI.
4 l
J
l All the NSSS digital safety signals fed into ERF computer, which drives the SPDS displays re routed via either the PSMS or the PERMS data links. These data links are one way, isolated, digital transmission links. Therefore, the spatial separation, the one-way flow of data, and the optical isolators installed on the data links provide protection to the safety systems.
In the third quarter of 1986, Westinghouse will conduct noise, RFI, and fault testing of their optically isolated data link systems. The results of this testing will be compiled in a WCAP in the fourth quarter of 1986.
Enclosures:
1.
Appendix B - Functional test procedures and results*
2.
Appendix C - Surge withstand Capability Test Procedure and Results*
3.
Section 8 and Appendix H of Isolation Device Panel Environmental & Seismic Qualification Report
- These reports are parts of Isolation Device Panels Environmental & Seismic Qualification Report 5
/