ML20081J939
| ML20081J939 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 03/21/1995 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9503280279 | |
| Download: ML20081J939 (18) | |
Text
{{#Wiki_filter:. .y DukeIbwerCompny ' T C McMEcxn McGuire Nuclear Generation Department VicePresident '
- 12700Hagers ferryRoad(MG01W)
(704)8754300 fluntersville, NC280788985 (704)8754309 Fax ( e-- March 21, 1995 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555
Subject:
McGuire Nuclear Station, Units 1 and 2 Docket Oos. 50-369 and 50-370 Supplemental Information to 2/23/95 Proposed Technical Specification Change Submittal TSs 3.8.2.1 and 3.8.3.1 - 125 VDC Vital I & C Power System Circuit Breaker Replacement \\
Dear Sir:
By letter dated 2/23/95,.McGuire Nuclear Station submitted a proposed Technical Specification (TS) amendment to incorporate a special footnote into TSs 3.8.2.1 and 3.8.3.1 to allow the de-energization of a 125 VDC vital bus for breaker replacement modification. The footnote also allows the use of temporary cables to connect the loads of the de-energized bus to an energized redundant bus, and allows a one-time extension of the allowable outage time from 72 hours to.112 hours to' complete'the replacement'of the breakers. Various technical discussions between ONRR staff and McGuire Nuclear Station staff followed this submittal. Through these technical discussions,.it was explained that the proposed breaker replacement modification will optimize the design to eliminate the EDSFI breaker miscoordination concern considering existing hardware f limitations. ONRR staff requested additional information regarding the options McGuire considered before choosing the proposed. breaker replacement, further explanation of the breaker coordination provided by the proposed' design,' time vs current I characteristic curves and data sheets for the breakers and switches, and explanation as to why it is necessary to perform l the breaker replacement at power. Please find attached (Attachment 1) McGuire's responses to these l questions. ! includes the characteristic curves and data sheets j_ for the. breakers and fuses, and a wiring diagram for the 125 VDC distribution center main breakers and switches. 9503200279 950321 PDR ADDCK 05000369 P. PDR j hk3 tl
U.S. NRC March 21, 1995 Page 2 A copy of this document is being forwarded to the appropriate North Carolina State Official. If any additional information is required, please call P.T. Vu at (704) 875-4302. fYRUL ' T.C. McMeekin Attachments xc: Mr. S.D. Ebneter Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta St., NW, Suite 2900 Atlanta, GA. 30323 Mr. V. Nerses Senior Project Manager U.S. Office of Nuclear Reactor Regulation One White flint North, Mail Stop 14H25 Washington, D.C. 20555 Mr. G. Maxwell NRC Senior Resident Inspector McGuire Nuclear Station Mr. Dayne Brown, Director Division of Radiation Protection P.O. Box 27687
- Raleigh, N.C.
27611-7687
- U.S. NRC-f March 21, 1995 Page 3 bxc: P. Herran (MG01VP) D. Jamil (MG01EE) W. Matthews (MG01EE) A. Williams (MG01EE) McGuire TS Change Subject File ELL (EC050) A.V. Carr (PB05B) G.A. Copp (EC05N) Z.L. Taylor-(CN01RC) Ed Burchfield (ONO3RC). E 9 t I i s l 1
km ei 4 } [ l L r 6 r 1 i ATTACHMENT 1 REQUEST FOR ADDITIONAL INFORMATION QUESTIONS AND ANSWERS i I E I i f i r l I i l l t I )
i U.S. Nuclear Regulatory Commission March 21, 1995 page 1 BACKGROUND: In letter to Duke Power dated 7/31/91 (EDSFI At McGuire Report Nos. 50-369/91-09 and 50-370/91-09), FINDING 91-09-01, it was identified that the 125 VDC breakers have miscoordination where a fault of higher than 4,500A on a single branch breaker will open the main 600A main feeder breaker separating the battery and charger from the 125 VDC distribution center. The result would be a loss of one channel (approximately one-half of one train) for both Units 1 and 2 simultaneously. Both Units would trip due to this loss. This miscoordination would have a more severe result when the distribution centers are cross connected with tie breakers as during charger maintenance. In this case, both units would again trip; however, two trains of vital I & C power could be lost. In letter to NRC dated 9/27/91, McGuire stated that the most feasible solution was to replace the charger breaker, battery breaker, main breaker and cross-tie breaker with non-fusible and fusible switches. McGuire also stated that it would determine the feasibility of providing full coordination in DC panelboards for branch circuit protection after considering concerns such as space limitations and plant operation during modification. In letter to NRC dated 12/12/91, McGuire stated that it would not be necessary to replace the charger breaker because of its internal current limiting feature. McGuire also stated that providing full coordination in DC panelboards was not feasible. In letter to NRC dated 8/26/94, McGuire stated that the main bus, battery and cross-tie breakers would be replaced by 12/31/95. In letter to NRC dated 2/23/95, McGuire submitted a proposed Technical Specification Amendment needed for this breaker replacement modification. In this submittal, it was stated that the main bus breaker would be replaced with a fusible switch, the battery breaker would be replaced with a non-fusible switch, and the tie breaker would be replaced with a 600 amp breaker. The explanation for the use of a higher amp breaker instead of a fusible or non-fusible switch for the tie breaker is provided in answer #3. Further explanation for battery protection with respect to the proposed battery non-fusible switch is provided in answer #2. I +
U.S. Nuclear Regulatory Commission March 21, 1995 page 2
- 1. QUESTION:
Describe the options that McGuire considered before choosing the proposed breaker replacement.
- 1. ANSWER:
The following options were also considered before selecting the current modification scope: a/ Replace Panelboards With Fuse Panelboards: This option was not explored in extensive detail simply because of the vast amount of installation, design and operating concerns that arise. b/ Replace Panelboard Feeder MCCB With A Fuse Or Larger Circuit Breaker: This option was considered and a suitable fuse could not be found which would ensure the upstream MCCBs would not unlatch. Increasing the size of the circuit breaker would require more space in the distribution center and larger compartments are not available. Increasing the panelboard feeder to the maximum which will fit in the compartment will not cause enough improvement to justify the cost of the changes (such as cable replacement). c/ Install Larger Circuit Breakers, Allowing Coordination: f After consulting several suppliers, no circuit breaker was found which could provide this function. This option would also require more space than is available in the distribution center. Cable termination would also need to be addressed. d/ Install a Fuse /MCCB Combination: This design is used on reactor building penetration circuits. Available space and coordination with upstream devices prevent this from being a feasible option. i e/ Install Battery Fused Switch Or Non-Fused Switch: To delay isolation of the battery until the main fuse can operate, the battery fuse must have a higher long-time rating than the main fuse (above 600A). Increasing the long-time rating of the fuse would remove any overload protection and require a larger switch assembly. The larger assembly could not be accommodated in the existing
~ U.S. Nuclear Regulatory Commission March 21, 1995 page 3 enclosure. If the battery fuse were to operate prior to the main fuse, the charger would remain connected to the system because of its current limit feature. Since adding a fuse to the battery switch would not significantly improve the system and there are physical restrictions, a non-fused switch was selected.
- 2. QUESTION:
The 600A battery circuit breaker will be replaced by a 600A non-fusible switch. Explain how the battery will be protected if the fault is between the distribution center fusible switch and the battery non-fusible switch.
- 2. ANSWER:
With this modification, the level of protection for the battery will not be decreased.irom the original design. In the original design the battery circuit breaker was located in the distribution center, so the original design did not have thermal or magnetic protection 2 rom the battery circuit breaker back to the battery. The battery conductors are in interlocked armor cable and less than 40 feet long. If an automatic overcurrent device was used in the battery switch position, it would further weaken the overall coordination scheme by challenging the main fuse to respond first. includes a wiring diagram for the distribution center main breakers and switches. All the switches are located in the same distribution center. The conductors between the main and the battery switches are also contained within this distribution center and are less than four feet long. Also contained in this distribution center are conductors connecting the charger circuit breaker and the battery switch. In both cases these conductors are silicone rubber insulated to a 600V 200 C rating. This node where the switches interconnect (see wiring diagram) is insulated cable (not bus bar), therefore the positive and negative buses cannot be inadvertently shorted by personnel working in the distr bution center. i As with any electrical system, a fault on the distribution center equipment itself could require extensive testing and repair. Any damage sustained to the battery would also be evaluated and repaired within the same time required for distribution center equipment repairs. j 1
i I V.S. Nuclear Regulatory Commission March 21, 1995 page 4
- 3. QUESTION:
Given the fact that the present distribution center main incoming circuit breaker (600A) and the battery circuit breaker (600A) may trip if a fault occurs on one of the 125 VDC panelboards, explain why the same 600A breaker when used as a tie circuit breaker will coordinate with the 125 VDC panelboard breaker.
- 3. ANSWER:
The proposed 600A tie breaker, when compared to the existing 400A tie breaker, will coordinate somewhat better with the 125 VDC panelboard breakers. The main coordination when in the cross-tie configuration is between the proposed main bus fusible switch and the panelboard breakers, instead of between the tie breakers and the panelboard breakers. The tie circuit breakers are only used to connect two channels under a Limited Condition of Operation (Technical Specification 3.8.2.1 action b). If a fault occurred on the channel without the battery during an LCO, that channel's tie circuit breaker would trip. This would isolate only the channel with the fault. If the fault occurred on the channel with the battery, that channel's panelboard breakers would trip before the main bus fusible switch would trip. This, again, would isolate only the channel with the fault. During normal operation, the tie circuit breakers are not used to cross-tie channels. The tie circuit breakers are used to connect two channels during the following operations: Op3 ration Frecuency Battery Service Test 18 Months Battery Performance Test 60 Months Equalize Charge See Note Note: Equalize charge is performed on an as needed basis as required by the quarterly pilot cell parameter test. An equalize charge has not been required in the past three years. Currently, molded case circuit breaker testing on the battery circuit breaker requires two channels to be cross-tied, however testing will not be required following the modification.
U.S. Nuclear Regulatory Commission March 21, 1995 page 5
- 4. QUEUTION:
Provide the time vs current characteristic curves for the 600A circuit breaker, 600A fusible switch, and 125 VDC panelboard circuit breakers. Also, provide data sheets for these breakers.
- 4. ANSWER: includes these curves and data sheets.
Also, a composite time current characteristic (TCC) curve is provided with all subject overcurrent devices included. Data is included separately if not included on TCC. Fuse rating given in l qualification document: 150Vdc 10,000AIC
- 5. QUESTION:
Explain why it is necessary to perform these modifications at power.
- 5. ANSWER:
These shared distribution centers are always energized and providing power to vital instrumentation and controls for both Unit 1 and Unit 2. During an outage this equipment supplies important loads needed for management of the outage such as residual heat removal, control power and automatic interlocks and controls.
1 l l l l I i 3 I l ATTACHMENT 2 CHARACTERISTIC CURVES DATA SHEET l WIRING DIAGRAM I i L h i l 1 i 1 l
. ~ -... - -.- ~.. -. 9 - =# WIRING DIAGRAM 7-- Two 350 MCM Cu / D PO R 1 To BATTERY TO CHARGER I '- - d" <- - IN D T. B. Aux. CONT. 0 AUX. CONT. COMPT.) 6 -l ^ l r l-yTTERY lI2 lI 4 ' LA f 'f k4 r 1 k5, l 4}l-4h3 BKR. SWITCH 2-A. 1-T 6, 600A.' 2T 2T / 3 N. t -4 -4 (T B3 i-DB iM v v ~ "' DB [P (N / P N AIN BUS ~ P N C0 FLEX FLEXIBLE BUS -f -f BAR
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T o LA BKR. 600 A.F. O l REVISED PER NSM: MQ-5?g8/P _p w REv!SION DATES d*.h IM g N.MG COPY "N 0 -- IMPLEMENTAT10N DATES aux. CONT. MLIED THIS IS A LIMITED EDITION PRINT s\\ND SHALL 91 4 i NOT BE USED AS A PERMANENT RECORD. 12 15 SCHEMATIC DIAGRAM 76 OA CONDITION 1 MCM 1314.01-0301 001 l HEF. LF-660-51 l REV DB-REV PER NSM WIRING DIAGRAM OiSTRIBuTION Mo-52428 P2 oRu. ppa,t/.ro/fr 125 VDC - VITAL SYSTEM E. FILE ~ CsKo,SM 2/i#ps MAIN BREAKERS ,J [R R AK APPR. p M/ Mf i DUKE POWER COMPANY l P.O. " A37498 & [F32365) CAN. ~ INSP. M M g/0/ff CONrgDCerfint en0ptatt OF S 3 netson etecraic a'r-880-Ovssi-i ERNS MC0042Cl OlvtSION OF SOLA SmSIC IsGU$falES TULSA REV. DB u
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