ML20207B829
| ML20207B829 | |
| 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 | |
| ML20207B835 | List: |
| References | |
| RTR-REGGD-01.075, RTR-REGGD-1.075 GN-999, NUDOCS 8607180263 | |
| Download: ML20207B829 (25) | |
Text
{{#Wiki_filter:. _ . - . _ . .-- doorgia Power Company 8 Pbst Offica Box 282 . Waynesbora Georgit 30830 ' Telephone 404 534-9961 ' 404 724-8114 Southem Company Services, Inc Fbst Office Box 2625 Birmingham, Alabama 35202
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Vogtle Project - July 15, 1986 Director of Nuclear Reactor Regulation File: X7BC35 Attention: Mr. B. J. Youngblood Log: GN-999 < PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C. 20555 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-100 AND CPPR-109 V0GTLE ELECTRIC GENERATING PIANT - UNITS 1 AND 2 IMPLEMENTATION OF ALTERNATE ELECTRICAL SEPARATION CRITERIA
Dear Mr. Denton:
The separation criteria utilized in the design of VEGP has been established in accordance with the standard separation requirements of IEEE 384-1974. These separation requirements have been met for the majority of the plant areas. 4 However, where the standard separation distances of IEEE 384 have not been met due to space limitations or other design constraints, a series of tests and analyses have been performed to establish alternate reduced minimum separation distances for circuits of 480 volts or lower voltage as allowed by section 5.1.1.2 of IEEE 384-1974 and Regulatory Guide 1.75. The test results are documented in Wyle Laboratories' Test Report No. d 48141-02, Volumes 1 and 2 which are attached. The Wyle report describes the l alternate reduced separation configurations that were established by analysis !I I based on the test results. Also attached is a proposed FSAR change. This change will be incorporated in Amendment 25 to the FSAR. The implementation of the design aspects of this report has an impact on the l construction schedule of Plant Vogtle. It is therefore respectfully requested
! that your staff review this report as soon as possible.
If your staff requires any additional information, please do not hesitate to contact me. Since rely,
- h. j '
J. A. Bailey - Project Licensing Manager 00 p g{180263860715 A OCK 05000424
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Director of Nuclear Reactor Regulation File: X7BC35 July 15, 1986 Log: GN-999 Page 2 JAB /sm Attachment xc: R. E. Conway R. A. Thomas J. E. Joiner, Esquire B. W. Churchill, Esquire M. A. Miller (2) B. Jones, Esquire G. Bockhold, Jr. NRC Regional Administrator NRC Resident Inspector D. C. Teper W. C. Ramsey (w/o att.) L. T. Gucwa Vogtle Project File 0594V
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VEGP-FSAR-1 [ 1.9.75.2 VEGP Position Conform as discussed below and in paragraph 7.1.2.2. Where isolation devices are used to isolate Class IE circuits l (, from non-Class 1E circuits, the circuits within or from the Class 1E equipment or devices to the isolation device (s) are identified as Class IE and are treated as such. Beyond the isolation device (s) these circuits are identified as non-Class 1E and are separated from Class IE circuits in accordance with paragraph 8.3.1.4.3. Power supply circuits from the transmission network which are connected to the Class l17 )O 1.E switchgear are identified as non-Class IE. All Class IE and non-Class IE circuits are separated in accordance with paragraph 8.3.1.4.3. Repair of cables in raceway using field splices is prohibited. l17 Cable manufacturers' splices and repairs are permitted provided they are qualified by the manufacturer to the same requirements and standards as specified in cable specifications. ] i All raceways and circuits are uniquely identified (by permanent numbering markers and color coding) to distinguish between redundant Class IE and non-Class 1E systems at intervals stipulated in Section 5.1.2 of IEEE Std. 384-1974. 4 j Circuits and raceways of safety-related groups A and C are routed in the lower cable spreading room. Circuits and raceways of safety-related groups B and D are routed in the upper cable spreading room. Group N raceways and circuits are routed in both upper and' lower cable spreading rooms. i ~_,
~Re' fer to paragraph 8.3.1.4.3;f'and table 8.3.1-4 for additional
]j information.
1.9.76 REGULATORY GUIDE 1.76, APRIL 1974, DESIGN BASIS TORNADO
; FOR NUCLEAR POWER PLANTS 1.9.76.1 Regulatory Guide 1.76 Position ,
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! 1.9-65 Amend. 17 7/85 ;
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VEGP-FSAR-8 ( accordance with ICEA P-46-426 where cable spacing is less than one diameter or the ambient temperature is greater than 40*C. All power cables penetrating fire stops have been derated an additional 10 percent. The 13.8- and 4.16-kV power cables generally maintain a minimum ( spacing of one cable diameter between adjacent cables in a single layer. The 480-V load center power cables have a rainimum spacing of 1/4 cable diameter. Where justified by analysis done on a case-by-case basis, minimum spacing of 1/4 diameter for 17 13.8- and 4.16-kV power cables and less than 1/4-diameter ( spacing for 480-V load center power cables have been permitted. Motor control center power cables and control and instrumentation cables are random fill. Control and instrument cable tray design fill is 40 percent of the area of the tray being used; 4-in. deep trays are used in all areas of the plant except where the 40 percent maximum fill of the 4-in. deep tray would be exceeded, in which case a 6-in. deep tray is used. Low voltage power trays are limited to a fill of 30 percent of the area of a 3-in. loading depth tray. When greater than 40 percent fill for control tray or 30 percent for power tray is required, analysis is performed to ensure that the trays will not be filled above the siderails ' and that the cables' ampacities have been properly derated. 8.3.1.4.3 Cable Routing There are five separation groups for th cable and raceway system: groups A, B, C, D, and N. Separation group A (4.16 kV, 480 V, 120 V ac, and 125 V de) contains circuits from safety train A and protection channel I (120 V ac, 125 V de, and instrumentation). Similarly, separation group B contains circuits from safety' train B and protection channel II; group C, train C, and channel III; group D, train D, and channel IV; and group N, normal, nonsafety-related circuits. Cables of one separation group are run in separate raceways and [ physically separated from cables of other separation groups. Group N raceways are separated from safety-related groups A, B, C, and D. However, raceways from group N are routed in the same areas as the safety-related groups per the spatial separation requirements of Regulatory Guide 1. 7.5. ( 1-n $minimum M Tob spatial j Zh separation requirements are as follows: A. Within the cable spreading rocms, control room, and shutdown rooms, the minimum vertical separation for open top cable tray is 3 ft, and the minimum horizontal separation is 1 ft. The minimum separation Amend. 5 4/84 8.3.1-31 Amend. 17 7/85
VEGP-ESAR-8 distance between enclosed' raceways qualified as i barriers is 1 in. The minimum separation distance between non-Class 1E conduit ' including alumin e- nn U-~ 5
-cepper-eheath;d c2bl-e$' and Class 1E open top cable trays is 1 in.
N 7 B. Within general plant areas the minimum vertical y separation is 5 ft, and the minimum horizontal J tJ, separation is 3 ft for open top cable tray. The o minimum separation distance between enclosed raceways j qualified as barriers is 1 in. The minimum separa, tion
- distance between non-Class 1E cond t 'wcluding C 5 aluminum er -copper cheathed cable nd Class lE open top cable trays is 1 in. ' (M
{ C. ithin panels and control boards, the minimum spatial ./ _o separation between components or cables of different fT 8 g d ] separation groups (both field-routed and vendor-supplied internal wiring) is 6 in. Where it is not b possible to maintain this separation, barriers are 1kb y f Ia installed between components and wiring of different separation groups, or analysis 1.st # pertormed to^ ,k g be h Cp
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determine the minimum separation requirements. Refer to subsection 7.1.2 for separation requirements
, 9 y o inside Westinghouse panels and control boards and to , ; y .) table 8.3.1-4 for circuits where analysis has been used.
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l VEGP-FSAR-8 D. Where spatial separation requirements between raceways of different separation groups are not met, fire barriers are installed as follows:
- 1. Where the minimum vertical separation is not maintained, a barrier is installed which extends N at least 6 in. on each side of the tray system or N to the wall, if a wall is within 6 in. when the
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{4 a trays are arranged in stacks.
% Where the trays cross each other, the barrier 3 i extending at least 1 ft on each side of the tray 20
{ (L.j system is spreading installed for those trays in the cable area. d,
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0_ Within the gen 2ral plant areas, however, the barrier extending at least 1 f t on each side of the top trays and 3 ft on each side of the bottom trays i b *- is installed. N %) % L t'
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Where raceways of H.ifferent separation groups are brought to a single enclosure, separation is gx C ~7 d , accomplished by the use of conduit routed in opposite directions from the enclosure, using the enclosure as
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q a barriery .4 2 {je /,o g Non-Class 1E circuits are electrically isolated from i ._) Class lE circuits, and Class 1E circuits from f Vy different separation groups are electrically isolated I
,, {-"dV7 with the use of isolation devices, shielding and wiring techniques, physical separation (in accordance O; '
l~ M f with Regulatory Guide 1.75 for circuits in raceways),
; or an appropriate combination thereof.
[3 3 h When isolation devices are used to isolate Class 1E bk 3 circuits from non-Class IE circuits, the circuits 4C o within or from the Class lE equipment or devices to I. . ,9 the isolation device (s) are identified as Class 1E and
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\ d separated from Class 1E circuits in accordance with the separation criteria described above.
( Amend. 9 8/84 8.3.1-33 Amend. 20 12/85
VEGP-FSAR-8 ( TABLE 8.3.1-4 CIRCUITS ANALYZED FOR SEPARATION REQUIREMENTS 1,7300 Process Control Syste A. Nuclear Instrumentation System 3, Solid State Protection System
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C V 1 f a. The analyses / tests performed for the above equipment are further described in paragraph 7.1.2.2.1. 4
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VEGP-FSAR-Q conduit cannot degrade the Class IE circuits in adjacent tray. The test results demonstrate that the (. (' . heat generated inside the conduit as a result of faulted cable does not produce sufficient heat to raise the temperature in the conduit to a level that will inflict damage to cables in the adjacent trays. The configuration that was tested i.e. , non-Class IE conduit installed above and/or below an open top / bottom Qg Class 1E cable tray, is similar to the VEGP raceway physical layout design. The results of the tests allow g a 1-in. physical separation between the non-Class 1E q conduit and the Class 1E cable tray if the cables inside the non-Class 1E conduit are over 6/0 in size 15 and 1-in. or less if the cables are 4/0 cr below. The 0- VEGP design criterion is to have minimum 1-in. physical separation between the non-Class 1E conduits and Class 1E cable tray, regardless of the size of the cables in D the non-Class 1E conduit. The tests were conducted with large cables to
\.) destraction. The level of energy dissipatea for such
[' cables is much higher than for smaller size enbles. T Consequently, the conservative results of such a test h will more than satisfy cases the cable size in the 3 conduit is smaller. The largest cable used on the VEGP qj project is 500 MCM, which is smaller than the cable tested. b Based upon these industry tests, faults in VEGP Q non-Class IE circuits confined within metallic conduit J
} will not damage cables in adjacent raceways.
o
- Based on the above analysis, the requirements of IEEE C* 384-1974 are met. This position is further I strengthened by IEEE 384-1981, paragraphs 5.5.1(3 ) and O
D 2 5.5.1(4), wherein it is stated that non-Class 1E o circuits do not become associated circuits as long as g they are in enclosed raceways. J
-C. Distances and materials utilized for internal N separation of Class IE circuits and devices or other components are as described by IEEE 384-1974, section 5.6.2. Metallic barriers and raceways are utilized for separation. Where fire-retardant material is utilized,
= 1y 2tmial W 4M M +n aRTM F-11T will be utilized.
(N. . Internal separation of Class IE circuits within the VEGP main control board is in compliance with paragraph 5.6.2 of IEEE 384-1974, Internal Separation, and specifically addresses the main control board. 'This Q430.75-3 Amend. 15 3/85
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