ML050190261
| ML050190261 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/10/2005 |
| From: | Rosalyn Jones Duke Energy Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML050190261 (30) | |
Text
,Duke RON A. JONES
-VPowere Vice President Oconee Nuclear Site A Duke Energy Company Duke Power ONO1VP / 7800 Rochester Highway Seneca, SC 29672 January 10, 2005 864 885 3158 864 885 3564 fax U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555
Subject:
Oconee Nuclear Station, Units 1, 2, and 3 Docket Nos. 50-269, 50-270, 50-287 Response to Request for Additional Information License Amendment Request (LAR) for Technical Specification (TS) 3.4.9, "Pressurizer," TS Change (TSC) Number 2003-07
Reference:
Letter from Ronald A. Jones (Duke) to U. S. Nuclear Regulatory Commission," Oconee Nuclear Station, Units 1, 2, and 3; Docket Numbers 50-269, 50-270, and 50-287; "Response to Request for Additional Information, License Amendment Request (LAR) for Technical Specification (TS) 3.4.9, "Pressurizer," TS Change (TSC)
Number 2003-07," dated May 11, 2004 In the aforementioned Reference, Duke Energy Corporation (Duke) responded to the Staff's request for additional information (RAI). This response included several diagrams depicting the switchgear, load centers, and motor control centers (MCCs) that feed the pressurizer heater groups for each unit. Also given were the current Units 1, 2, and 3 maximum kilowatt values available which consisted of the sum of 2 of 3 switchgears following the loss of the highest worth switchgear. As concluded from this information, the maximum kWs available to the heater elements were well above the 400 kW minimum proposed in the LAR.
In July 2004, the Staff requested more detailed information with regards to pressurizer heater breaker coordination. In response to this request, in September 2004, Duke completed an evaluation that analyzed the breaker coordination on nonsafety loadcenters that supplied the pressurizer heaters and transmitted it to the NRC for review. Following an October 2004 conference call, the NRC requested that thermal limit curves, for cables supplying load centers and MCCs and for the nonseg bus supplying the 4.16 kV switchgear, be added to the report. This request has been completed and the revised report is attached. A brief summary of the report is given below.
Summary The attachment to Duke Power's submittal to the NRC dated May 11, 2004 (Reference) shows the normal alignment for the Switchgear and Load Centers that supply the various pressurizer heater groups. Refer to this attachment for a basic understanding of the power alignment. Load centers 1X6, 1X7, 2X5, 2X6, 3X5 and 3X6 each supply a single motor control center (MCC) for the Pressurizer Heaters.
Load centers 1X5, 2X4 and 3X4 supply two MCCs for pressurizer heaters. The A
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U. S. Nuclear Regulatory Commission January 10,2005 / Page 2 and K heaters are on one MCC and the E and H heaters are on another MCC. The B heaters are supplied from safety system MCC's.
The existing Oconee breaker coordination calculation (OSC-3120) demonstrates coordination between the 4.16 kV Switchgear main breakers and the 4.16 kV feeder breakers to the 600V load centers. This demonstrates that an overload or fault on the load centers will not cause the loss of a 4.16 kV switchgear. The calculation does not extend to lower voltage levels on the nonsafety system.
Most Oconee nonsafety MCCs, including all those that feed the pressurizer heaters, have a normal and alternate supply coming from different load centers. If a motor control center is in its normal alignment and the source switchgear or load center loses power and power is available from the alternate load center, the MCC will be automatically re-aligned to its alternate source by load center breaker action. Thus, loss of the normal switchgear or load center source would not result in loss of power to any pressurizer heaters. The previous submittal did not take credit for this automatic transfer.
For the load centers supplying the pressurizer heater MCCs, the protection between the load center feeder breakers supplying the MCCs and the load center main breaker or 4.16 kV Switchgear feeder to the load center has been examined and found to coordinate except for a 600V system three phase fault with a high degree of asymmetry. Plans are to reset the instantaneous unit on the 4.16 kV feeders to the nonsafety load centers. Once reset, an overload or fault on a MCC center would not cause power to a load center to be lost due to miscoordination.
The load center feeders to the Pressurizer heater MCCs utilize a long time and instantaneous trip. The MCC incoming breaker is a thermal magnetic breaker with an instantaneous trip. The feeders to pressurizer heater circuits are protected with a thermal magnetic breaker which has an instantaneous trip. Since all devices associated with MCC protection have instantaneous trips, there is a possibility that a MCC feeder fault could cause the loss of an entire MCC resulting in loss of all heaters fed from one specific MCC. This is no different than what would occur for a fault on a MCC bus and will not prevent the necessary amount of heaters from being available.
On loss of the offsite source, load centers 1X5, 1X6, 2X5, 2X6, 3X5 and 3X6 are re-energized automatically when voltage is restored to the plant 4.16 kV electrical system via the onsite source. Power to the 1X7, 2X4 and 3X4 load centers is automatically restored after a 1 minute time delay.
With the present relay setpoints, a nonsafety load center could be tripped for a 3 phase fault on a 600V load center feeder. However, the required pressurizer heater capacity would remain available. Once the instantaneous units are reset on the 4.16 kV feeders to the load centers, up to one pressurizer heater MCC could be lost due to load center feeder overloads or faults. Based on the previously submitted study, a heater capacity of greater than 400 kW would be available following tripping of a bus due to an overload or short circuit.
U. S. Nuclear Regulatory Commission January 10, 2005 / Page 3 Please pfyct any questions or requests for additional information to Stephen C.
Newnran, Oponee Regulatory Compliance Group, at (864) 885-4388.
Attachment
U. S. Nuclear Regulatory Commission January 10, 2005/ Page 4 xc:
W. D. Travers, Regional Administrator U.S. NRC, Region II Atlanta Federal Center 61 Forsyth St., SW., Suite 23T85 Atlanta, GA 30303 L. N. Olshan, Project Manager, Division of Licensing Project Management U. S. Nuclear Regulatory Commission Mail Stop 0-8 H12 Washington, DC 20555-0001 M. C. Shannon NRC Senior Resident Inspector Oconee Nuclear Station
U. S. Nuclear Regulatory Commission January 10, 2005 / Page 5 AFFIDA V'IT R. A. Jones, being duly sworn, states that he is Vice President, Oconee Nuclear Site, Duke Energy Corporation, that he is authorized on the part of said Company to sign and file with the U. S. Nuclear Regulatory Commission this revision to the Facility Operating License Nos. DPR-38, DPR47, and DPR-55; and that all statements and matters set forth herein are true and correct to the best of his knowledge.
R. A. Jo es, Vice President Oconee Nuclear Site Subscribed and sworn to before me this i)day of 05 Notary Public My Commission Expires:
&/ /D/2X 3 Date SEAL
Attachment Evaluation of Breaker Coordination of Nonsafety Loadcenters Supplying PZR Heaters (Rev. 1)
Oconee Nuclear Station Evaluation of Breaker Coordination on Nonsafety, Loadcenters Supplying Pzr Heaters
-Rev. 01 I1 By: Datc:
Da JZ/j/- Y Reviewed:, f Sj! ~Date: J1 / i /o t
I 1.0 Purpose Demonstrate Switchgear feeder to the loadeentcr and loadcenter mains coordinate with the loadccnter feeder breakers 2.0 References 2.1 IPIOA1A4980/052D, Rev. 26, Carriere FB600E Trip Device Test 2.2 TP/I/A14980/05IA, Rev 13, CO-5, CO-6, CO-7, CO-8, and CO-1I Relay Test 2.3 IP/)/A/4980/05IA, Rev 19, CO-5, CO-6, CO-7, CO-8, and CO-1I Relay Test 2.4 IPI3IA/4980/051A, Rev 21, CO-5, CO-6, CO-7, CO-8, and CO-1I Relay Test 2.5 OSC-3120, Rev. 08, Oconee Relay Settings and Breaker Coordination 2.6 OSC-2059, Rev. 18 2.7 OSC-2060, Rev. 17 2.8 OSC-2061, Rev. 15 2.0 Assumptions 2.1 All loadcenters supplying pressurizer heaters are energized, supplying their normal loads.
3.0 Method of Analysis The relay settings for the incoming breaker and feeder breakers for loadcenters feeding pressurizer heaters were determined from Reference 2.1 and tabulated in Table 1. The relay settings for thc 4.16KV Switchgear breakers supplying the loadeenters was determined from References 2.2, 2.3 and 2.4. The setting for thc 4.16 kV Switchgear Breakers are the same, and the loadeenter main breakers on Units I and 3 are the same.
The loadcenter mains on Unit 2 are set to trip faster in the longtime region but all Unit 2 Mfains have the same setting. The feeder breaker with the highest longtime pickup was determined. The 4.16kV Breaker Relaying, the Loadcenter Main Breaker and the Loadcenter feeder breaker was then plotted in Captor (Figure l). The Captor database and library established in OSC-3 120 was used to plot the curves. In checking loadcenter feeder breaker coordination with upstream breakers both the loadcenter main and 4.16 kV breakers must be checked because the trip curves of these two breakers eross. Loading of feeders was based on LOCA loadflow studies with the pressurizer heaters on.
Coordination w as checked on the wvorse case feeder circuit. The worsc case feeder circuit is the circuit which %when load is increased on the feeder to the LT pickup, will result in the greatest loadeenter load. Note that in all cases significant margin exists betwec'n the loadcenter feeder breaker and the loadeenter main or 4.16 kV switchgear breaker.
Loading in amperes was taken from study cases in OSC-2059, OSC-2060 and OSC-2061 for the steady state load flow during a LOCA with the Pressurizer Heaters operating.
Loading on each loadcenter feeder is tabulated in Tables 2, 4, and 6.
Figures 2, 3, and 4 show the protection of the load center feeder cables supplying the motor control centers.
2 Figure 5 shows the protection of the cable supplying the load center transformers from the sivitchgear.
It is desirable that the instantaneous relaying supplying load center transformers from the 4.16 kV system be set above the three phase fault current on the 600V load center. This is done to assure that for a three phase fault on a load center feeder breaker there is no likelihood that the 4.16 kV breaker instantaneous relay, ill trip the 4.16kV breaker supplying the load center. Load center 1X7 transformer has the lowest transformer impedance (7.77% on a 1500 kVA base) and hence a fault on a feeder from load center I X7 %%illhave the highest 4.16 kV system contribution.
The calculated fault current supplied from the 4.16 kV System to a fault on IX7 is 17,644 amperes per OSC-2059, Rev. 18, Attachment 1, page 20, Case 5B.
At 4160V this results in a fault current of If= 2545 amps The CT ratio for the 4.16 kV feeder circuits to the non-safety transformers is 300!5.
Thus, thc above fault current will result in a CT secondary current of let = 2545
- 5/300 = 42.4 amperes The instantaneous units for the 4.16 kV feeders to the 1500 kVA nonsafety load centers supplying pressurizer heaters are presently set at 61 amperes.
The present relay setpoint is 61/42.4 = 1.44 times the secondary symmetrical three phase fault current.
Duke Electrical Criteria RE-3.01 recommends that the instantaneous setpoint be above 1.73 times the symmetrical fault current. Thus, Ir min = 73.4 amperes.
It is recommended that the relay setpoints be increased to at least greater than 73.4 amperes. A setting of 75 amperes is recommended.
Figure 1A and 5A shows the relay curves with the instantaneous setpoint on the 4.16 kV feeders to the load centers increased to 75 amperes.
Figure 6 compares the relay curve for the 4.16 k-V Swvitchgear incoming breaker with the thermal damage curve of the nonsegregated phase bus. Bus thermal limit information was obtained from Jay Patel at Nimisha International.
4.0 Conclusion Based on Figure I and the results tabulated in Tables 2 and 7, it is concluded that the feeder breakers on the nonsafety loadcenters feeding pressurizer heater motor control centers coordinate with upstream breakers except for some high level three phase faults.
With the present instantaneous setpoint for the 4.16 kV breaker supplying the load centers and for a three phase fault with a high degree of asymnnctry, a fault on a load center feeder breaker could trip the 4.16 I;N breaker. Coordination will exist for three phase faults with the recommended new setpoint. Based on Figures 2 thru SA, it is concluded that the cables are properly protected against short circuit currents. Figure 6 shows that the 4.16 kV Switchgear relaying properly protects the nonsegregated phase bus.
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11 Table I Loadcenter Relay Setpoints Loadoenter 1X5 fed from ITD-02 LC Compt Desc LT Pickup LT Delay ST Pickup ST Delay Inst 1X5 4A Main 1600 A 12.5s @ 6X 12000 A .25 sec NIA 1X5 4C 1XH Norm 600 A 12.5s @ 6X n/a nla 4800 Amp 1X5 4D 1XK Norm 200 A 12.5s@ 6X n/a na 1600 Amp 1X5 5A 1XT Norm 400 A 12.5s @ 6X nla nla 3200 Amp 1X5 5C 1XL Norm 400 A 12.5s @ 6X nla nla 3200 Amp 1X5 6A IXO Emer 600 A 12.5s @ 6X n/a n/a 5000 Amp 1X5 6B IXI Emer 600 A 12.5s @ 6X nia nia 5000 Amp I
12 Table 1, Continued Loadoenter Relay Setpoints Loadcenter 1X6 fed from 1TE-02 LC COmpt Desc LT Pickup LT Delay ST Pickup ST Delay Inst 1X6 4A Main 1600 A 12.5s @ 6X 12000 A .25 sec N/A 1X6 4C IXI Norm S600A 12.5s @ 6X nla n/a 4800 Amp 1X6 4D 1XP Norm 600 A 12.5s @ 6X nla nla 4800 Amp 1X6 5B 1XN Norm 300 A 12.5s @ 6X n/a nla 2400 Amp 1X6 6A 1XJ Emer 600 A 12.5s@ 6X nla n/a 5000 Amp 1X6 6B 1XK Emer 200 A 12.5s 6X a nla 1600 Amp 1X6 6C 1XR Emer 400 A 12.5s 6X /a na 3200 Amp 1X6 6D 1XL Emer 300 A 12.5s @ 6X n/a n/a 2400 Amp
13 Table 1, Continued Loadcenter Relay Setpoints Loadoenter 1X7 fed from ITC-02 LC lCompt Desc LT Pickup LT Delay ST Pickup ST Delay Inst 1X7 14A Main 1600 A 12.5s @ 6X 12000 A .25 sec NIA 1X7 4C XJ Norm 600 A 12.5s @ 6X nla n/a 4800 Amp 1X7 4D 1XR Norm 400 A 12.5s @ 6X n/a n/a 3200 Amp 1X7 5B 1XO Norm 600 A 12.5s @6X nla n/a 4800 Amp 1X7 6A IXH Emer 600 A 12.5s @6X nla n/a 5000 Amp 1X7 6B IXT Emer 400 A 12.5s@ 6X nla n/a 3200 Amp 1X7 6C 1XN Emer 300 A 12.5s @ 6X nfa n/a 2400 Amp 1X7 6D IXPEmer 600 A 12.5s i 6X n/a n/a 5000 Amp 4
14 Table 1, Continued Loadcenter Relay Setpoints Loadcenter 2X4 fed from 2TC-03 LC Compt Desc LT Pickup LT Delay ST Pickup ST Delay Inst MCC Main 2X4 4A Main 1600 A 7.5s @ 6X 12000 A .25 sec NIA 2X4 4C 2XH Norm 600 A 12.5s @ 6X nla n/a 5000 Amp 600A TB6 2X4 4D 2XK Norm 200 A 12.5s @ 6X nla n/a 1600 Amp 200ATB4 2X4 5A 2XR Norm 400 A 12.5s () 6X nla n/a 3200 Amp 400A TB4 2X4 6A 2XI Emer 600 A 12.6s @ 6X n/a na 5000 Amp 600A TB6 2X4 6B 2XL Emer 400 A 12.5s @ 6X nla n/a 3200 Amp 400ATB4 2X4 6C 2XP Emer 600 A 1 2.5s @ 6X n/a n/a 5000 Amp 600ATB6
15 Table 1, Continued Loadcenter Relay Setpoints Loadcenter 2X5 fed from 2TD-03 LC Compt Desc LT Pickup LT Delay ST Pickup ST Delay Inst MCC Main 2X5 4A Main 1600 A 7.5s @ 6X 12000 A .25 sec NIA 2X5 4C 2XI Norm 600 A 12.5s @ 6X nra n/a 5000 Amp 600A TB6 2X5 4D 2XL Norm 400 A 12.5s @ 6X nla n/a 3200 Amp 400A TB4 2X5 5A 2XO Norm 600 A 12.5s @ 6X nla nla 5000 Amp 600A TB6 2X5 A 12XJ Emer 600 A 12.5s @ 6X n/a n/a 5000 Amp 600A TB6 2X5 6B 12XR Emer 400 A 12.5s @ 6X n/a n/a 13200 Amp 400A TB4 2X5 6C 12XN Emer 400 A 12.5s @ 6X n/a n/a 3200 Amp 400A TB4
16 I
Table 1, Continued Loadcenter Relay Setpoints Loadcenter 2X6 fed from 2TE-03 LC Compt Desc LT Pickup LT Delay ST Pickup ST Delay Inst MCC Main 2X6 4A Main 1600 A 7.5s @ 6X 12000 A .25 sec NIA 2X6 4C 2XJ Norm 600 A 12.5s ( 6X nla nla 5000 600A TB6 2X6 4D 2XN Norm 400 A 12.5s © 6X nla nla 3200 Amp 400A TB4 2X6 5A 2XP Norm 600 A 12.5s @ 6X n/a n/a 5000 Amp 600A T86 2X6 6A 2XH Emer 600 A 12.5s @ 6X n/a nla 5000 Amp 600A TB6 2X6 6B 2XK Emer 200 A 12.5s @ 6X n/a na 1600 Amp 200A TB4 2X6 6C 2XO Emer 600 A 12.5s @ 6X n/a nla 5000 Amp 600A TB6
17 Table 1. Continued Loadoenter Relay Setpoints Loadeenter 3X4 fed from 3TC-03 LC Compt Desc LT Pickup LT Delay ST Pickup ST Delay Inst MCC Main 3X4 4A Main 1600 A 12.5s @ 6X 12000 A .25 sec N/A I_ I 3X4 4C 3XH Norm 600 A 12.5s @ 6X lna lna 4800 Amp 600A TB6 3X4 4D 3XK Norm 200 A 12.5s @ 6X n/a nra 1600 Amp 200A TB4 3X4 5A 3XR Norm 600 A 12.5s @ 6X n/a nla 4800 Amp 600A TB6 3X4 5B 3XT Norm 400 A 12.5s @ 6X n/a nla 3200 Amp 400A TB4 3X4 6A 3XI Emer 600 A 12.5s @ 6X n/a na 4800 Amp 600A T86 3X4 6B 3XL Emer 400 A 12.5s @6X na n/a 3200 Amp 400A TB4 3X4 6C 3XP Emer 600 A 12.5S @ 6X n/a n/a 4800 600A TB6
18 Table 1, Continued Loadoenter Relay Setpoints Loadcenter 3X5 fed from 3TD-03 LC Compt Desc LT Pickup LT Delay ST Pickup ST Delay Inst MCC Main 3X5 4A Main 1600A 12.5s@6X 12000 A .25 sec N/A 7 _ 1 3X5 4C 3XI Norm 600 A 12.5s @ 6X nla n/a 4800 Amp 600A TB6 3X5 4D 3XL Norm 400 A 12.5s @ 6X nla n/a 3200 Amp 400ATB4 3X5 5A 3XO Norm 600 A 12.5s @ 6X nla n/a 4800 Amp 600A TB6 3X5 6A 3XJ Emer 600 A 12.5s @ 6X n/a n/a 4800 Amp 600ATB6 3X5 6B 3XR Emer 600 A 12.5s @ 6X n/a n/a 4800 Amp 600A TB6 3X5 6C 3XN Emer 400 A 12.5s @ 6X nla n/a 3200 Amp 400ATB4
19 Table 1. Continued Loadoenter Relay Setpoints Loadoenter 3X6 fed from 3TE-03 LC Compt Desc LT Pickup LT Delay ST Pickup ST Delay Inst MCC Main 3X6 4A Main 1600 A 12.5s @ 6X 12000 A .25 sec N/A 3X6 4C 3XJ Norm 600 A 12.5s @ 6X n/a n/a 4800 Amp 600A TB6 3X6 4D 3XN Norm 400 A 12.5s @ 6X n/a n/a 3200 Amp 400A T84 3X6 5A 3XP Norm 600 A 12.5s @ 6X n/a n/a 4800 Amp 600A TB6 3X6 6A 3XH Emer 600 A 12.5s @ 6X n/a nla 4800 Amp 600AT86 3X6 6B 3XK Emer 200 A 12.5s @ 6X n/a n/a 1600 Amp 200ATB4 3X6 6C 3XO Emer 600 A 12.5s @ 6X n/a n/a 4800 Amp 600ATB6 3X6 6D 3XT Emer 400 A 12.5s @ 6X n/a n/a 3200 Amp 400A TB6
20 Table 2 Unit I LOCA results with Pzr Heaters On-LOCA Loads Amps LC 1X5 . _ _ 852 1XH 187.5 IXK 154.3 1XT 302.4 IXL 240.6 1X6 507.7
_1XI 248.6 IXP 115.2 IXN 169 1X7 700.3 1XJ 208.1 1XR 387 XO 1__ 128.7
-Ampere values are from OSC-2059, Rev 18 Steady State Load Flows Table 3 1 Unit 1 1X5 Coordination During a LOCA .
LC/Swr Fdr Current LC to 1XH LC Fdr Trip LC Load Trip 600 >366 sec 1264.5 1500 85 sec 2164.5 201 sec 2000 47 see 2664.5 128 sec 3000 20.7 sec 3664.5 68 sec 5340 7 sec 6004.5 15 sec Above approximately 5340 Amps LC feeder will trip instantaneously.
21 Table 4 Unit 2 LOCA results with Pzr Heaters On' LOCA Loads Amps 626 1 LC 2X4 .
2XH 189.7 2XK 156.1 2XR 302.7 2X5 557.5 2XI 353.7 2XL 116.2 2X0 114 2X6 288.6 2XJ 118.8 2XN 101.4
____2XP
__ 85.6
' Ampere values are from running a loadflow case using the LOCA case in OSC-2060, Rev 17. Steady State Load Flows Table 5 Unit 1 2X5 Coordination During a LOCA LCISwr Fdr Current LC to 2XO LC Fdr Trip LC Load Trip 600 >366 sec 1043 1500 85 sec I 1943 146 sec 2000 47 sec 2443 90 sec 3000 20.7 sec 3443 45 sec 5340 7 see _ 578316 sec Above approximately 5340 Amps LC feeder will trip instantaneously.
22 Table 6 Unit 3 LOCA results With Pzr Heaters On' LOCA Loads _ Amps LC 3X4 _ 922.62
_3XH 174.48 3XK 154.5 3XR 311.52 3XT 314.24 3X5 703.56 3XI 325.64 3XL 189.35 3XO 220.04 3X6 _ 479.34 3XJ 183.37 3XN 155.41 3XP 164.6
- Ampere values are from running load case in OSC-2061, Rev 15 Steady State Load Flows Table 7 Unit 3 3X4 Coordination During a LOCA _ __
LC/Swr Fdr Current LC to 3XH LC Fdr Trip LC Load Trip 600 >366 sec 1348.14 1500 85 sec 2248.14 182 sec 2000 47 sec 2748.14 124 sec 3000 20.7 sec 3748.14 67 sec 5340 7 see 6088.14 15 sec Above approximately 5340 Amps LC feeder Mwll trip instantaneously.