GO2-82-974, Forwards marked-up Revision to FSAR Section 8.3.1.4 Reflecting Analysis Justification for coil-to-contact Relay Isolation Between Redundant Class IE Circuits & Revision 0 to Electrical Separation Practices
| ML17276B756 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/09/1982 |
| From: | Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17276B758 | List: |
| References | |
| GO2-82-974, NUDOCS 8212170374 | |
| Download: ML17276B756 (8) | |
Text
REGULATORY I RMATION DISTRIBUTION SYST 4 (RIDS)
AWCESS40N NBR:8212170374 DOC,DATE: 82/12/09 NOTARIZED:
NO FE<C5f,:$ 0 397 WPPSS Nuclear Pr ojecti Uni t 2~ Washington 'Publ ic Powe AU'fHQvA4E AUTHOR Af FlLIATION
"-BQUCH(YgG,D ~.
Washington Public Power Supply System REC 1P ~ NA4 REC IP IENl'F F ILIATION SCHNENCERgA, Licensing Branch 2
DOCKET 05000397
SUBJECT:
Forwards marked-up revision to FSAR Section 8>3.1,4 reflecting analysis Justification for coil-to-contact relay isolation between redundant Class IE circuits L forwards Revision 0 to "Electr ical Separation Practices" DISTRIBUTION CODE 8001S COPIES RECEIVED LTR ENCL SIZE ~,
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TITLE: Licensing Submittal:
PSAR/FSAR Amdts 8, Related Correspondence NOTES:
RECIPIENT ID CODE/NAME NRR/DL/ADI NRR LB2 LA INTERNAL: ELD/HDS2 IE/DEP EPDS 35 NRR/DE/AEAB NRR/DE/EQB 13 NRR/DE/HGEB 30 NRR/DE/MTEB 17 NRR/DE/SAB 24 NRR/DHFS/HFE840 NRR/DHFS/OLB 34 NRR/DS I/AEB 26 NRR/DSI/CSB 09 NRR/DSI/METB 12 N
8 22 04 RM/DDAMI/MIB EXTERNAL: ACRS 41 DMB/DSS (AMDTS)
LPDR 03 NSIC 05 COPIES LTTR ENCL.
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RECIPIENT ID CODE/NAME NRR L82 BC
- AULUCKgR, 01 IE FILE IE/DEP/EPLB 36 NRR/DE/CEB ll-NRR/DE/GB 26 NRR/DE/MEB 18 NRR/DE/QAB 21 NRR/DE/SEB 25 NRR/DHFS/LQB 32 NRR/DL/SSPB NRR/DS I/CPB 10 NRR/DSI/ICSB 16 NRR/DS I/PSB 19 NRR/DS I/RSB 23 RGN5 BNL(AMDTS ONLY)
FEMA REP DI V 39 NRC PDR 02 NTIS COPIES LTTR ENCL 1
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LTTR 52 ENCL
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Dear Mr. Schwencer:
Subject:
Also, enclosed is the WNP-2 Electrical Separation Practices document as committed in previous conversations on this subject.
Section IV, Field Verification, is currently being revised and will be submitted prior to December 24, 1982, as Revision 1 to this. document.
Additional clarifications to the FSAR section on Electrical Separation will also be provided by December 24, 1982.
Very truly yours, NUCLEAR PROJECT NO.
2 FSAR SECTION 8.3, ELECTRICAL SEPARATION Enclosed are sixty (60) copies of a revision to FSAR Section 8.3.1.4, reflecting analysis justification for the coil-to-contact relay isolation between redundant Class 1E circuits.
G.
D. Bouchey
- Manager, Nuclear Safety and Regulatory Programs CDT/jca Enclosure cc:
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~ v WNP-2 AMENDMENT NO.
23 February 1982 8.3.1.4.3.6.3 PGCC Cable Assembly and Routing The cable assembly within the power generation control complex is designed around the following variables:
engineered system designation, circuit signal classification, PGCC separation classification based on power supply, and finally, the origination/destination which provides the routing and length (see Table 8.3-21).
Each PGCC cable is precut, assembled (with lugs and connectors at either end as required) and installed in the panel/floor module shipping section.
Special cable and routing requirements are shown on Table 8.3-22.
The cable. jacket and conductor insulation for the cables within the PGCC is either Raychem Flamtrol, General Electric Vulkene/Geoprene, or Tefzel.
The fire suppression system has been provided to limit any off-gasing/smoke that could result from a cable fire.
Cable routing consists of two categc@4s:
field interface terminations
( fits) and system interface terminations (sits).
Fits cables are routed between termination cabinets and PGCC control panels, while sits cables are routed between PGCC control panels and do not interface with BOP field cable (see Figure 8.3-30).
8.3.1.4.3.7 Separation Within Panels Separation of wiring in panels and instrument racks for redun-dant divisions of=-Class lE circuits is accomplished by mounting redundant equipment on physically separated panels or control boards wherever practicable.
Where locating control devices on separate panels is considered prohibitive for manual operation of equipment for optimum equipment arrangement, and where no single credible event in a single panel could disable two sets of redundant control circuits, both devices are located in the same panel.
Where control devices of redundant systems are mounted in the same panel, physical separation (six inches), barriers, or isolation devi-ces are provided.
Wherever wiiing of two redundant divisions exists in a single panel section, separated or isolated ter-minal boards and wiring preclude the possibility of fire pro-pagation from one division of fairing to another.
This separation is adequate since the material used in the construction of panel board, devices, and wiring are of a fire retardant nature.
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Insert "A" to 8.3.1.4.3.7, Page 8.3-58c The justification for this configuration is provided below.
The coil-to-contact relays used for isolation included General Electric types HHA, HFA and CR105 and Agastat type GP.
The relays are used for 125VDC or less applications.
The justification for this type configuration is the following:
a.
The circuits are all control circuits which are low energy.
b.
Wire insulation is fire retardant complying with the requirements of IEEE 383-1974.
c.
Each circuit is provided with Class 1E over-current protective devices to isolate faults.
d; These circuits are not allowed to bridge directly between redundant Class lE raceways.
e.
Fire loading inside panels is a minimum.
f.
Wire insulation within these relays is rated at 600 V minimum Type Class A or H
while the control circuit voltage carried by this wiring is 125 VOC maximum.
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