ML18153C858

Forwards Request for Addl Info Re App R Multiple High Impedance Fault Submittal,Dtd 901219.Responses to Request for Addl Info Submitted as Rev to Chapter 9 App a of Plant 10CFR50 App R Rept Included as Attachment 2 to Ltr

ML18153C858
Person / Time
Site:	Surry
Issue date:	12/27/1991
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
91-406A, NUDOCS 9201060060
Download: ML18153C858 (50)

Text

SURRY 1 VE&PCO Appendix R-Multiple High Irrpedance Fault Submitta Request for Additional Information Rec'd w/ltr dtd 12/27/91 ... 9201060060

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-NOTICE-

ATTACHMENT l

• REQUEST FOR ADDITIONAL INFORMATION RELATING TO THE SURRY, UNITS 1 AND 2 APPENDIX R MULTIPLE HIGH IMPEDANCE FAULT SUBMITTAL DOCKET NUMBERS 50-280 AND 50-281 We have reviewed the Appendix R multiple high impedance fault submittal dated December 19, 1990, which was provided for the Surry Nuclear Station. Information in this submittal clearly suggests that a fire area by fire area analysis for all Appendix R related associated circuits was not performed. Further, the submittal contains general concluding statements without providing supporting factual information for these statements. In view of these items, we request the following additional information.

1. The Appendix R high impedance fault submittal indicates that 480 Vac motor control centers (MCCs) supply a great diversity of loads located in various plant locations. In addition, this submittal also indicates it is expected that the Unit 1 and Unit 2 480 Vac MCCs supply like unit loads located in different plant areas with power often routed in different directions. Further, the submittal indicates that it would be

• difficult to ascertain the physical locations of the 480 Vac MCC circuits and predict their operation. In view of these expectations and uncer-tainties, provide additional supporting information for the concluding statement that power engineering believes that load diversity and the relatively low (50A or less) trip ratings of many of the 480 Vac MCC breakers limit the potential for tripping due to multiple high impedance faults.

2. The submittal section addressing the 120 Vac vital bus system notes that the 120 Vac vital buses supply a limited number of loads generally located in the control room and emergency switchgear room (including the instrument rack room). In addition, this submittal section contains the statement 11 though there are a number of associated circuits, there are expected to be few circuits not directly unit related and, therefore, routed into common areas. 11 We interpret the above to mean that there are a number of 120 Vac associated circuits in the control room and emergency switchgear room, however most of these associated circuits are expected to be specifically related with either Unit 1 or Unit 2. Verify or clarify this interpretation and provide additional supporting infor-mation for the expectation that there are few circuits not-directly unit related and as such few circuits routed into common areas.

3. Miscellaneous colTITlunication equipment power supplies are: a Unit 1 120/240 Vac semi-vital bus, a Unit 1 120/240 Vac heat trace panel, and a Unit 2 120 Vac communication panel. For these Appendix R power sources, the submittal indicates. it is expected that many of the associated circuits supplied by them are local, while others enter various plant areas. On

• the basis of this expectation, it is assumed in the submittal that a sufficient number of associated circuits from one supply do not enter the redundant power supply fire area to warrant concern for multiple high impedance faults. Provide additional factual information for the above expectation and as such the resulting assumption.

ATTACHMENT 2 CHAPTER 9 APPENDIX A MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION SURRY POWER STATION - UNITS I and 2 PREPARED BY VIRGINIA POWER CH9-APPA Page 1 of 6 Revision 9

SUMMARY

Generic letter 86-10 indicates that high impedance faults should be considered for all associated circuits located in the fire area of concern to meet the

• separation criteria of Sections III.G.2 and III.G.3 of Appendix R. In this case, associated circuits are defined as circuits not required for safe shutdown but

. powered by necessary power supplies. The concern is that a fire expected to result in the loss of an-Appendix R power supply will also result in the loss of the redundant power supply as a result of simultaneous high impedance faults (below the trip point for the breaker on each individual circuit) of associated circuits routed into that same fire area. GL-86-10 states that the phenomenon should be considered for impact on the plants' safe shutdown capability and addressed by either a circuit coordination study or by assuming the shutdown capability will be disabled and provide written procedures to clear the faults.

Virginia Power has performed an evaluation of each Appendix R power supply and determined that the probability of loss due to simultaneous high impedance faults is either impossible in some cases or highly improbable in others for the reasons discussed in this evaluation. Therefore, no further circuit coordination study has*been performed or written procedures developed.

Surry Power Station consists of two "mirror image" units. For fire scenarios in critical plant areas, it is necessary to depend on mechanical cross connects, etc. and shutdown both units with equipment from only one unit. Therefore, redundant equipment often comprises equipment from the opposite unit rather than from redundant channels. Because both units contain similar power supplies, it is not typically necessary to route an abundance of Unit 1 cable into Unit 2 areas and vice versa. This is particularly true for the emergency electrical distribution system utilized for safe shutdown. This natural separation is used as a basis in this report to state that it is assumed that a sufficient number of associated circuits are not routed into fire areas of concern and that the probability of this occurring is low.

Generally, the following sections of this evaluation will provide additional analysis to supplement this reasoning. The attachments to this analysis were prepared in late 1991; it is not intended that this information be maintained up to date based on load changes programmatically. Future load additions or changes are expected to be consistent with the conclusions drawn from the attached tables.

4160V SWITCHGEAR The 4160V switchgear buses (IH, IJ, 2H, and 2J) are not susceptible to tripping due to multiple high impedance faults. The sum of all overcurrent relay trip devices (phase and ground) on the buses' circuits is lower than that of the buses' main, offsite supply, circuit breakers. The same is true when the buses are supplied by their respective emergency diesel generator (phase only, the EDGs are ungrounded) due to the load shed of the "stub" bus supplying the Component Cooling and Residual Heat Removal pumps. The stub bus would be returned to service later to achieve cold shutdown, but this should be after clearing of any other potentially faulted circuits on the buses. Any 4160V high impedance CH9-APPA Page 2 of 6 Revision 9

fault(s) would be expected to have developed into a lower impedance fault by that time and be selectively cleared.

480V SWITCHGEAR The 480V switchgear (load center) buses (lH-1, lJ-1, 2H-1, 2J-1) are not subject to tripping due to multiple high impedance .faults on associated circuits. ~ach 480V load center consists of one feeder breaker and, typically, six load breakers. Of the six, two supply Appendix R required MCCs. Some are spared or provide only contingency service. Therefore, there are very few (0-2) energized associated circuits originating from each Appendix R required 480V load center.

As a result, the sum of the overcurrent trip devices on the Appendix R 480V load center associated circuits, including back-up, contingency breakers is less than the feeder device trip setting.

480V MOTOR CONTROL CENTERS

• \;,* **.; ****.=*',Numerous 480V motor,.,control centers (MCCs) are required for Appendix R, as shown on the Appendix R Evaluation Electrical One Line Diagrams for Surry Units 1 and

2. The required MCCs are located in either the Emergency Switchgear Rooms (Fire Areas 3, 4) or the cable vaults and tunnels (Fire Areas 1, 2) of the respective unit. For a fire in either of those areas of either unit, in general, the other unit's electrical distribution system is utilized for safe shutdown of both units.

The MCCs supply~ great diversity of loads located in various plant locations; it would be difficult to ascertain the physical locations of all MCC circuits.

But, as can be seen by reviewing Attachment 1, the Unit 1 and 2 MCCs predominantly supply like unit loads which would typically be located in different plant areas. Also, the MCC loads vary in frequency of operation; a majority of the associated circuit, as shown in Attachment 1 (e.g., MOVs), are normally de-energized. As discussed in Section 3.8.4 of this Appendix R Report,

• only.fires local to the MCCs are expected to spuriously operate MOVs, i.e.,

energizing the 480V power cables. This philosophy applies equally to other de-energi zed 1oads supp 1i ed by motor starter/contactors. Therefore, the 1arge number of de-energized associated circuits, spuriously energized only for fires at the MCC, and the relatively low (50A or less) trip ratings of a majority of the associated MCC breakers limits the potential for tripping due to multiple high impedance faults.

The ungrounded 480V system at Surry warrants that a minimum of two different phase conductors are necessary to produce fault current. A single conductor in contact with a grounded object, such as a conduit or cable tray, would not draw fault current. Two or three phase conductors are routed to each load, and in many cases, multiconductor or triplexed cables are used. To avoid severely derating power circuits, they are sometimes routed in dedicated conduit. The close proximity of the phase conductors would discourage high impedance faults because the little material existing between conductors would burn away quickly producing a lower impedance, high current fault. The 480V MCCs at Surry have three-phase fault currents of 15,000 - 19,000A available at the buses .

• CH9-APPA Page 3 of 6 Revision 9

• Therefore, some margin typically exists between the available fault current at the end of the circuit and the breaker overcurrent/trip rating. Because of the strong sources and low MCC breaker trip ratings, there should be adequate margin to selectively operate breakers supplying either low or high impedance faults.

Additionally, for motor loads, the contactor overload heaters are sized based on nameplate fuli load current and will operate (i.e., interrupt) for values of load or fault current lower than that required to operate the breakers. It is

• unlikely that a sufficient number-of*high impedance faults with current* l~wer than the individual breaker trip ratings, or motor contactor overloads, will exist to cause operation of the MCC feeder breakers.

For these reasons, the probability of multiple high impedance faults causing misoperation is extremely low and no special precautions are necessary.

125VDC DISTRIBUTION SYSTEM The I25VDC system is an ungrounded system requiring both a positive and negative conductor from the same bus to produce a fault.

• Faults on this system differ

• • ""from -AC*.faul ts .because. the voltage difference between the two involved conductors is constant rather than cyclic and, therefore, DC faults would tend to be uninterrupted allowing materials between the two conductors to be burned away.

This would either clear the fault or, more likely, create a low impedance fault that can be selectively cleared.

• Each DC bus is simultaneously supplied by both the battery and charger. The chargers supply limited fault current and, therefore, most is supplied by the batteries. A circuit breaker between the battery charger and the bus will open for an overcurrent condition, but the batteries are connected directly to the bus. Therefore, the absence of a main bus breaker precludes the possibility of loss of power to the bus. Power will continue to be served and th~ faults(s) would be expected to be cleared. Though the associated DC circuits have not been traced to determine routing, the diversity of DC provided equipment and locations suggests that it is unlikely that a substantial number of circuits would be routed together in such a way to compromise the DC system. The DC distribution cabinets are further limited in exposure to faults because numerous circuits supply other panels or cabinets. Additional levels of protection are provided at those points for circuits originating from those panels, etc.

For these reasons, high impedance faults are not considered a major concern on the I25VDC system and no special precautions have been taken.

120VAC VITAL BUS SYSTEM The I20VAC Vital Buses are normally supplied by current limiting inverters and alternately by current limiting voltage regulating transformers. The vital buses supply a limited number of loads generally located in the Control Room and Emergency Switchgear Room* (including the Instrument Rack Room). Though there are a number of associated circuits, there are few circuits not directly unit related and, therefore, routed into common areas .

• CH9-APPA Page 4 of 6 Revision 9

• Attachment 2 was prepared based on controlled station drawings. The fire zone associated with each vital bus panel and most individual loads has been provided based on a review of plant .physical arrangement drawings and interviews with personnel familiar with plant arrangement; a small number of fire zones are not identified. Additionally, each Appendix R required circuit has been identified based on review of the Appendix R block diagrams, 11448/11548-FE-90 series drawings; all other circuits are "associated." Note that a majority of loads for each vital bus are located in the same fire area as the bus. Additionally, the Control Room (Unit 1 side) is adjacent, directly above, the Unit 1 Emergency Switchgear Room; same for Unit 2. Power cables between the Control Room and Emergency Switchgear Rooms are typically routed through floor sleeves directly between the areas requiring no routing into other plant fire areas. Given this physical arrangement of the plant and the information shown in Attachment 2, few associated circuits for redundant Appendix R required vital buses are routed into common fire areas.

From the Control Room and Emergency Switchgear Room circuit destinations, numerous "secondary" circuits are originated; those circuits may be routed into various plant areas but would typically be protected from that origination point

• .,*ri,:limiting .. the *required protective zone of the Appendix R protective devices.

Also, nonsafety-related circuits entering potentially harsh environments are fused in accordance with 10 CFR 50.49(b)2. The additional protective devices would increase the probability of interrupting the fault.

The automatic transfer from the UPS inverter to the regulating transformer will

• increase the available fault current by a factor of five; this design feature was intended to clear faults. The additional available fault current may provide the *current'required to selectively trip faulted branch circuits.

Additionally, at 120VAC, high impedance faults are not certain to be sustained.

For these r'easons, it is considered improbable that multiple high impedance faults will result in loss of a 120VAC vital bus and no additional precautions have been taken.

MISCELLANEOUS POWER SUPPLIES Other than the several categories of Appendix R power supplies already discussed, there are a number of other miscellaneous power supplies that do not fit into those classifications.

A 120VAC "Appendix R Distribution Panel" has been installed for each unit to supply the Remote Auxiliary Monitoring Panels. The Appendix R panels are not subject to multiple high impedance faults because they lack a sufficient number of associated circuits.

Communication equipment is supplied from the Unit 1 120/240VAC Semi-Vital bus, two 120/240VAC heat trace panels, and an unscheduled 120VAC communications panel.

All of these are, therefore, Appendix R power supplies. These power supplies were chosen, partially, due to the fact that they are located in different areas of the plant .

• CH9-APPA Page 5 of 6 Revision 9

• As shown in Attachment 3, which was prepared based on controlled station drawings, the Unit 1 Semi-Vital Bus (lSVBl) supplies loads predominantly located in the Control Room (Fire Area 5) and the Unit 1 Emergency Switchgear Room (Fire Area 3). As stated for the Vital Buses, the Unit 1 portion of the Control Room is adjacent to the Unit 1 Emergency Switchgear Room and, therefore, cables routed between the two typically follow the shortest route through floor sleeves and into no other fire areas.

The heat trace panels supply heat tracing for the Chemical Volume and Control System (CVCS). A review of the heat tracing conduit plans (11448-FE-63 series) and Operating Procedure OP-27, * "Heat Tracing," indicates that the heat traced components are located in the Auxiliary Building (Fire Area 17). There are very few (1-2 per panel) loads other than heat tracing, like Communications, powered by these panels.

The unscheduled communications breaker panel is located in the Unit 1 Cable Spreading Room (Fire Area 31). That panel supplies no associated circuits; it supplies only the communication equipment analyzed for Appendix R.

Accordingly, a sufficient number of associated circuits from one of these supplies does not enter the redundant power supply fire area warranting fear of multiple high impedance faults. As in other sections of this report it is expected that most faults will either be extinguished or develop into a lower impedance, high current fault allowing proper selective tripping.

Therefore, no additional precautions or measures have been taken for any of these power supplies.

CH9-APPA Page 6 of 6 Revision 9

• MCCs MCCs MCCs lHl-1, lJl-1, 2Hl-1,

• ...2N & S

-2E & W

-2N & S ATTACHMENT 1 MCCs 2Jl-1, -2E & W Existing Circuit Breaker

Reference:

1. Calculation EE-0298, SPS 1 & 2, 480V Molded Case Circuit Breaker Replacement

2. 11448/11548-FE-1 Series Drawings

3. EWR 89-300, Evaluate MI (MOVs) Power Supply

4. Original Plant Design Cutler-Hammer Drawings 11448-1.16-155A through 274A, not inclusive, 11548-1.16-195A through 214A, not inclusive Note: FA3015 indicates 3-phase, 15 amp, Westinghouse type FA.

In some cases, assumptions are made due to lack of information regarding a specific circuit breaker (i.e., an unknown breaker size is assumed to be identical to that of redundant equipment or a load of the same size).

Appendix R/Associated Circuits The Appendix R circuits are identified based on the Appendix R Block Diagrams (11448/11548-FE-90 series) and on Chapter 3 of this Appendix R Report; other circuits are by definition "associated."

Energized/De-energized/Intermittent Circuits circuits falling into these categories have been so designated for the purposes of this report. For conservatism, "Energized" is used more liberally assuming various modes of unit operation.

MCP/ses-2077

SURRY POWER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1H11 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A I I I *- NORMALLY I BREAKER I LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED CE), i I BKR. APPENDIX R CR) DE-ENERGIZED (D), I I I NT ERM I TT ANT Cl ) I I I I I 1A Main Fdr Breaker R E 18 To MCC 1H1-1A JA3175 E 1C Ctrl rm emer sup fan 1-VS-F-41 FA3015 D 1D Charg PP serv Wt PP 1-SW-P-10A FA3040 R E 1E-1 Computer inverter 3-5 KVA TRANS FA3040 E 1E-2 480 V pwr recptacle FA3100 D 2A-1 Semi-vital Bus (alt) 1SVB1----- HFC3070 E 2A-2 SPARE 28 Brg cool ht exh inlet MOV SW-101A FA3015 D 2C Boron inj tk disch MOV 1867C FA3015 D 2D-1 RAD MON CAB 1-1/1-2, 1PH 10 KVA TRANS FA3050 E 2D-2 Spare FA3070 3A Comp cool ht exh inlet MOV SW-102A FA3015 D 38 Chilled water outlet MOV PG-107A FA3040 D 3C Chrg PP saf inj MOV 1869A FA3040 D 3D Cont/rly rm AC cond PP 1-VS-P-1A FA3050 R E 4A-1 A/C fdr 1-VS-AC-1 FA3040 R E 4A-2 A/C fdr 1-VS-AC-7 FA3040 R E 48-1 Spare FA3040 48-2 Spare FA3040 4C UPS 1A-1 UPS 1A-1 JA3150 R E 4D AC chiller PP 1-VS-P-2A FA3050 R E

• SA* Ctrl/rly rm wt chll 1-VS-E-4A JA3175 R E 58-1 Spare HFB3070 58-2 UPS 1A-2 bypass 1A-2 HFB3100 R E

SURRY POWER STATION UNIT ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1H11 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I

I I *-

I I

I LOAD EQUIP. ID EXIST.

BKR.

REQUIRED APPENDIX R (R)

NORMALLY ENERGIZED CE),

DE-ENERGIZED (D),

INTERMITTANT (I)

I SC Chg PP cool Wt PP 1-CC-P-2A FA3040 R E SD Erner Gen Fdr PP 1-EE-P-1A FA3015 R SE-1 Fdr 25KVA trf ht cab HTP-2A3 FA3070 R E SE-2 Ht trace cab #1 FA3070 E 6A Oup cond PP saf area 1-HS-P-38 FA3040 68 Cond inlet MOV CW-106C FA3020 D 6C Recirc spry ht exch MOV SW-103A FA3015 D 6D Rel rm emer supp fan 1-VS-F-42 FA3015 D 7A Cond outlet MOV CW-100D FA3020 D 78 Rec spr ht exch MOV SW-103D FB3015 D 7C Cond inlet MOV CW-106A FA3020 D 7D seal oil bkup pp FA3050 E BA Cond circ wt outlet MOV CW-1008 FA3020 D 88-1 Fdr 15KVA trf ht cab #5 15 KVA TRANS FA3070 E

• 88-2* CONTROL ROOM LTG LP 1C1 FA3070 R E BC Turning gear oil PP JA3125 E

• SURRY POWER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1H12N 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A I I I *- NORMALLY I BREAKER I LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED CE), i I BKR. APPENDIX R CR) DE-ENERGIZED (D)

• I I INTERMITTANT Cl) I I I I I 1A Aux fd wtr cross tie MOV FW260A FA3015 R D 1B Lo hd saf inj suet MOV 1860A FA3015 D 1C PP refuel wtr star tk MOV LCV1115B FA3015 D 1D Chrg pp aux oil pp 1 CH P 1A FA301S E 2A Caustic isol vlv MOV CS103A FA3015 D 2B Chrg pp recir line MOV 127SA FA301S D 2C Chrg pp set vol cont tk MOV LCV1115C FA3015 D 2D Cont vac pp 1 CV P 1A FA301S

• 3A Caustic isol vlv MOV CS-103C MCP31SO D 3B Lo hd saf inj rwst MOV 1862A FA301S D 3C Chrg pp recirc line MOV 127SC FA3015 D

• 3D* Cont/Relay Rm Vent MOD-VS-104B FA301S E 4A Saf area sump pp 1 DA P 1A FA301S 4B Alt ht hd cld leg MOV 1842 FA301S D 4C Chrg pp rep seal stp MOV 1370 FA3015 D 4D REC SPRY PP MOT HTR 1PH RS P 1A FA3030 E SA CON SPRY PP MOT HTR 1PH cs p 1A FA3030 E SB Saf inj ace disch MOV 186SA FA3040 D Sc Chrg line stop MOV 1289A FA3015 D SD Safe area exh fan VS F 40A FA3030 E 6A LHSI PP HTR 1PH SI P 1A FA3030 E 6B Out rec spry pp suet MOV RS 1SSA FA301S D 6C LH si disch to chrg pp MOV 1863A FA301S D 6D REC SPR PP MOT HTR 1PH RS P 2A FA3030 E 7A Boric acid htr CHE 6A FA3040

SURRY POWER STATION UNIT 1 ATT ACHMEN*T MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1H12N 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I -- NORMALLY BREAKER 1 LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

I BKR. APPENDIX R (R) DE-ENERGIZED (D),

I I NT ERM ITTANT ( I )

I I

• 7B* Rec spry ht exch inl MOV SW 104A FA3015 D

• 7C* Rec spry ht exch outl MOV SW 105A FA3015 D 7D Boric acid htr 1 CHE 6B FA3040 8A Lo hd saf inj MOV 1890A FA3015 D

• 8B* Rec spry ht exch inl MOV SW 104C FA3015 D

• 8C* Rec spry ht exch outl MOV SW 105C FA3015 D 8D1 SWGR BUS 1J HTR FDR 15 KVA TRANS FA3100 E 802 lncore inst drive "D" FA3100 E

• 9A Lo hd saf inj MOV 1890C FA3015 0 9B Rec spry cl cross conn MOV SW 106A FA3015 0 9C Out rec spr pp dis MOV RS 156A FA3030 D 90 Rad man samp pp 1 SW P SC FA3040 10A Lo hd saf inj disch MOV 1864A FA3015 0 10B Cont rm_Exh air damp vs 1030 FA3015 E 10C Erner make up pp FW P 4A FA3100 11A-1 H2A tap box 1 FA3070 0 11A-2 Heat tracing cab HTP-2A2 FA3100 E 11B Cont rod cool fan VS F60A JA3125 E 11C Cont rod cool fan VS F 60F JA3125 E

SURRY POWER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1H12S 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A NORMALLY BREAKER LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

BKR. APPENDIX R (R) DE-ENERGIZED (D),

INTERMITTANT (!)

1A Cont spry pp disc MOV CS 101A FA3015 D 1B Aux st gen fd pp MOV FW 151A FA3015 D 1C Res ht rem outlet MOV 1720A FA3040 D 1D Aux st gen fd mtr htr 1 FW P 3B FA3030 E 2A Lo hd saf inj rec MOV 1885A FA3015 D 2B Cont spry pp dis MOV CS 101C FA3015 D 2C Aux st gen fd pp MOV FW 151E F.A3015 D 2D UPS 1A-2 JA3150 R E

• 3A Lo hd saf inj rec MOV 1885C FA3015 D 38 Cont spr pp suet MOV CS100A FA3015 D 3C Aux st gen fd pp MOV FW 151C FA3015 D 3D Rad mon samp pp 1 SW P SA FA3040 4A Chrg pp suet MOV 1270A FA3015 D 4B Ref w chm add tk disc MOV CS 102A FA3015 D 4C Rep bypass MOV 1585 FA3015 D 4D Cont/rel room filt 1 VS S 1A FA3040 E SA Chrg pp disch MOV 1286A FB3015 D SB Rep bypass MOV 1587 FA3015 D SC Chrg pp to boron tk MOV 1287A FA3015 D 5D-1 480 V pwr recp fdr FA3100 D 5D-2 Aux bldg elev fdr FA3100 E 6A Press release MOV 1535 FA3015 D 68 Chrg pp disch MOV 1286C FA3015 D 6C Cont/rel rm vent MOV VS104A FA3015 D 60 Hydrogen recomb A SW 1H1 264 JA3125 D

SURRY POWER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1H12S 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I -- NORMALLY BREAKER 1 LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

I BKR. APPENDIX R (R) DE-ENERGIZED (D),

I INTERMITTANT (I)

I I

7A Chrg pp suet MOV 1267A FA3015 D 7B Chrg pp rec line MOV 1275B FA3040 D 7C Boric acid filt to pp MOV 1350 FA3015 D 7D Future 8A Cont rm isol MOV VS103A FA3015 D 8B Chrg pp suet MOV 1267B FA3015 D 8C Res ht rem inlet MOV 1700 FA3015 D 80 Future FA3015 9A POST ACCID PURGE BLOWER 1 GW C 3A FA3030 D 9B Rep outlet stop MOV 1591 FA3050 D 9C Rep inlet stop MOV 1590 FA3050 D 10A Boric acid trans pp CH P 2A FA3050 E 10B Aux bldg fltr ex fan VS F 9A FA3100 R E 10C-1 Fdr ht trace cab HTP 2A1 HFB3100 E 10C-2 UPS 1A-1 bypass HFB3100 R E 11 Main feeder R E 11A Erner gen oil pp 1 EE P 1 D FA3015 R 11 B Rep outlet stop MOV 1595 FA3050 D 11C Rep inlet stop MOV 1594 FA3050 D

SURRY POWER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1J11 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I *-

I I

I LOAD EQUIP. ID EXIST.

BKR.

REQUIRED APPENDIX R CR)

NORMALLY ENERGIZED (E),

DE-ENERGIZED (0),

I INTERMITTANT Cl)

I I

1A Brg cool w ht exc inl MOV SW 1018 FA3015 D 18 Turn gear mot JA3125 E 1C Spare 2A1 Test equip recp fdr FA3100 D 2A2 HEAT TRAC CAB #2 FDR 3P FA3070 E 28 Space FA3040

• 2C* SPARE FA3020 2D Comp cool ht exch inl MOV SW 1028 FA3015 D 3A1 RAD MON FDR 1PH FA3030 E 3A2 A/C Feeder 1-VS-AC-2 FA3030 R E 381 Lo press co2 refrg fdr FA3070 E 382 TRANS FANS FDR RSS 3PH 1A,1B,1C FA3100 E

• 3C* SPARE FA3020 3D Chill w outlet MOV PG 1078 FA3015 D 4A Gen brg lift pp FA3020 E 48 Chrg pp serv w pp 1 SW P 108 FA3040 R E 4C Erner gen f.o. pp EE P 1C FA3015 R 4D Chrg pp cool w pp 1 cc P 28 FA3040 R E

• SA* SPARE FA3020 58 Space SC UPS 181 HFB3150 R E SD Appx R pwr trans cab JA3225 R E SE Dup cond pp safe area HS P 3A FA3015 6A Cont/rel rm ac cond pp vs P 18 FA3050 R E

• 68* AC chil L w pp vs P 28 FA3050 R E

SURRY POWER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1J 11 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I .-

I I

I LOAD EQUIP. ID EXIST.

BKR.

REQUIRED APPENDIX R (R)

NORMALLY ENERGIZED (E),

DE-ENERGIZED (D),

I INTERMITTANT (I)

I I

• 6C* Cont/rel rm w chill fdr 1 VS E 48 JA3225 R E 6D Chrg pp aux oil pp 1 CH P 1B FA3015 E

"'6E* SPARE FA3040

• 7A* SPARE FA3020 78 Re seal w/ ret stop MOV 1381 FA3015 D 7C Rec spry ht exch MDV SW 103C FA3015 D 701 SEMI VITAL BUS FDR 1PH HFB3100 R E 702 UPS 18-2 bypass HFB3100 R E

• 8A

• 88*

8c 8D1 Rec spry ht exch Spare HHS! dis to cld leg A/C Fdr MOV SW 1038 MDV 18670 1-VS-AC-6 FA3015 FA3015 FA3015 FA3070 R D

D E

8D2 HT TRAC CAB #4 FDR 3PH FA3070 E 9A Chrg pp saf MDV 18698 FA3015 D 9B Spare FA3015

• 9C* Spare 90 Future

• SURRY POWER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1J12E 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I NORMALLY I BREAKER LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED CE),

I BKR. APPENDIX R CR) DE-ENERGIZED CD),

I I NT ERM ITT ANT CI )

I I

1A1 H2A tap box 2 FA3070 D 1A2 Spare FA3030 18 Saf inj ace tk disch MOV 18658 FA3070 D 1C Safe inj ace tk disch MOV 1865C FA3070 D 1D Spare FA3050 2A Inst air comprss 1 IA C 1 JA3175 E 28 Lo hd saf inj suet MOV 18628 FB3015 D 2C Chg pp suet vol cont tk MOV LCV 1115E FA3015 D 3A Space FA3015 38 Cont vac pp CV P 18 FA3015 3C CONT SPR PP MOT HTR 1PH cs P 18 FA3050 E 3D Safe area sump pp DA P 18 FA3015 3E St gen aux fd mot ht 1 FW P 3A FA3050 E 4A Aux fd wtr cross tie MOV FW 2608 FA3015 R D 48 Lo hd saf inj pp recirc MOV 1885D FA3015 D 4C Caustic 250 vlv MOV CS103B FA3015 D 4D REC SPR PP MOT HTR 1PH 1 RS P 18 FA3050 E SA Chrg pp suet rwst MOV LCV 1115D FA3015 R D 58 Lo hd saf inj suet MOV 18608 FA3015 D SC Chrg line stop MOV 12898 FA3015 D SD Safe area exh fan 1 VS F 408 FA3030 E 6A Outs rec spr pp suet MOV RS 155B FA3015 D D

• 68 Lo hd.saf inj disch MOV 18648 FA3015

• 6C* Rec spr ht exc inl MOV SW 1048 FA3015 D 6D Hydro recomb B JA3125 D

SURRY PO\.IER STATION UNIT 1 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1J12E 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I

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NORMALLY EN ERG I ZED CE),

DE-ENERGIZED (D),

I NT ERM ITTANT CI )

I I

• 7A* Rec spr ht exc outl MOV S\.I 105B FA3015 D 7B Rad mon samp pp 1 S\.I P SD FA3030

• 7C* Rec spr htr ex inl MOV S\.I 104D FB3015 D 7D LHSI MOT HTR 1PH 1 SI P 1B FA3050 E

• BA* Rec spr ht ex outl MOV S\.I 105D FA3015 D BB Lo hd saf inj loop MOV 1B90B FA3030 D BC Rec spry cool crss conn MOV S\.1106B F.A3015 D BD REC SPR PP MOT HTR 1PH 1 RS P 2B FA3050 E 9A Outs rec spr pp disch MOV RS 156B FA3015 D 9B LH saf inj disch MOV 1863B FA3015 D 9C Boric acid tk htr 1 CHE 6C FA3050 9D1 4KV swgr Bus H htr fqr FA3070 E 9D2 Incor inst for drive E FA3040 E 10A Resid ht rmvl outl MOV 1720B FA3015 D 10B Res ht rem inlet MOV 1701 FA3015 D 10C Cont rod cool fan 1 VS F 60C JA3125 E

SURRY POWER STATION UNIT ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1J12W 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I *- NORMALLY BREAKER I

• LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

I BKR. APPENDIX R (R) DE-ENERGIZED (D),

I INTERMITTANT (I)

I I

1A Caus isol vlv MOV CS 103D FB3015 D 1B Aux st gen fd pp w htr MOV FW 151D FA3015 D 1C Chrg pp suet MOV 1269A FA3015 D 1D1 Personnel hatch fdr FA3015 D

• 1D2* Air dryer 1 IA D FA3100 E 2A Chem tank disch MOV CS102B FA3015 D 2B Aux st gen fd pp wt htr MOV FW 151B FA3015 D 2C Chrg pp suet MOV 1269B FA3015 D 2D Chrg pp aux oil pp 1 CH P 1C FA3015 E 3A Cont spry fd suet MOV CS 100B FA3015 D 3B Aux st gen fd pp wt htr MOV FW 151F FA3015 D 3C Chrg pp suet MOV 1270B FB3015 D 3D Spare 4A Cont spry pp disch MOV CS 101D FA3015 D 4B React cool pp Bypass MOV 1586 FA3015 D 4C Chrg pp disch MOV 1286B FA3015 D 4D1 UPS 1B-1 bypass HFB3100 R E 4D2 Spare HFB3070 SA Cont spry 'pp disc MOV CS 101B FA3015 D SB Chrg pp disch MOV 1287B FB3030 D SC React cool pp inl stop MOV 1592 FA3050 D 6A Rad man sample pp SW P SB FA3040 6B Erner make up PP FW P 4B FA3100 6C React cool pp outl stp MOV 1593 FA3050 D 7A Chrg pp disch MOV 1287C FA3015 D

SURRY POWER STATION UNIT ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 1J12W 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I NORMALLY BREAKER I -- LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED CE),

1 BKR. APPENDIX R CR) DE-ENERGIZED CD),

I INTERMITTANT CI)

I I

7B Spare FA3015 7C Chrg pp recirc line MDV 1373 FA3015 D 7D Future 8A Press relief isol MDV 1536 FA3015 D 8B Lo hd saf inj recirc MDV 1885B FA3015 D ac Cont rod cool fan 1 VS F 60D JA3125 E 9A Cont rm isol MOD VS 103B FA3030 E 9B POST-ACCID PURGE BLOWER GW C 3B FA3030 D 9C Safe supp ht vent unit VS HV 4 FA3050 10A UPS 1B-2 JA3150 R E 10B Boric acid transf 1 CH P 2B FA3050 10C Aux bldg fil by exh fan 1 VS F 9B FA3100 R E

• SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2H11 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A NORMALLY BREAKER LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

BKR. APPENDIX R (R) DE-ENERGIZED (D),

INTERMITTANT (I)

Mn fdr bkr 24H16 R E 1A1 Ht trace cab #11 FA3070 E 1A2 Lighting LP2C1 FA3070 R E 18 Chrg pp wtr pp 2 CC P 2A FA3040 R E 1C Cont rm supp fan 2 VS F 41 FA3015 D 10 Chrg pp/serv wtr pp 2 SW P 10A FA3040 R E 1E1 Comm VHF repeat FA3015 R E 1E2 480 V PWR RECPT FA3100 D 2A-1 Semi-vital Bus (alt) 2SVB1 HFC3070 E 2A-2 spare NA 28 Brg cool ht ex inl MOV SW 201A FA3015 D 2C HHSI dis cld Leg MOV 2867C FA3015 D 201 Rad man cab2-1 & 2-2 FA3040 E 202 Spare FA3040 NA 3A Sv wtr pp sue vlv MOV SW 202A FB3015 D 38 Chill wtr out MOV PG 107C FA3040 R D 3C UPS 2A-1 JA3150 R E 30 Cont/rel ac pp 1 VS P 1C FA3050 R E 4A1 Spare FA3040 NA 4A2 Spare FA3040 NA 481 A/C fdr 2 VS AC6 FA3040 R E 4B2 A/C fdr 2 VS ACS FA3040 R E 4C EMER BACK-UP APP R JA3225 R E 40 AC chill pp 1 VS P 2C FA3050A R E

• SA* Cont/rel rm wtr chill 1 VS E 4C JA3175A R E

SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2H11 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I

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REQUIRED APPENDIX R CR)

NORMALLY ENERGIZED CE),

DE-ENERGIZED CD),

INTERMITTANT Cl)

I I

581 SPARE HFB3070 NA 582 UPS 2A-2 bypass 2A2 HFB3100 R E SC Erner gen rm fdr #2 2H1-1A JA3175 E SD Erner gen f.o. pp EE P 18 FA3015 R SE Cont/rel rm filt vs s 18 FA3040 E 6A Dup cond pp safe area 2 HS P 38 FA3015 68 Cond cir w inl MOV CI.J 206C FA3020 D 6C Rec spr ht exch MOV SW 203A FA3015 D 6D Rel rm emer supp fan 2 VS F 42 FA3015 D 7A Cond cir wt outl MOV CI.J 200D FA3020 D 78 Recir spry ht exch MOV SW 203D FA3015 D 7C cond cir wt inl MOV CW 206A FA3020 D 7D Turb seal oil bk pp FA3050 8A Cond cir wt outl MOV CI.J 2008 FA3020 D 88 Chrg pp saf inj MOV 2869A FA3040 D ac Turn gear oil pp 2TGP FA3100 E

• SURRY POWER STATION UNIT 2 ATTACHMENT 1 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2H12N 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I

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REQUIRED APPENDIX R (R)

NORMALLY ENERGIZED (E),

DE-ENERGIZED (D),

INTERMITTANT (I)

I I

1A Chrg pp recir stop MOV 2275A FA3015 D 18 Lo hd saf suet MOV 2860A FA3015 D 1C Chrg pp sue rwst MOV LCV2115B FA3015 D 1D Chrg pp aux oil pp 2 CH P 1A FA3015 E 2A AUX S G FD PP MOT HT 1PH 2 FW P 38 FA3050 E 28 Rad mon samp pp 2 SW P SA FA3040 2C Chrg pp suet vol cnt tk LCV 2115C FA3015 D 2D Cont vac pp 2 CV P 1A FA301-5

• 3A Erner gen oil pp 2 EE P 1E FA3015 R 38 Aux fd wtr cross tie MOV FW160A FA3015 R D 3C

• Chrg pp rec Line MOV 2275C FA3015 D 3D Spare NA 4A Safe area samp pp 2 DA P 1A FA3015 48 Alt high hd MOV 2892 FA3015 D 4C Chrg pp rec stop MOV 2370 FB3015 D 4D REC SPRY MOT HTR 1PH 2 RS P 1A FA3050 E SA CONT SPR PP MOT HTR 1PH 2 CS P 1A FA3050 E 58 Saf inj ace disch MOV 2865A HFA3040 D SC Chrg Line stop MOV 2289A FA3015 D SD Saf area exh fan 2 VS F 40A FA3030 E 6A Lo hd saf inj mot htr 2 SI P 1A FA3050 E 68 Out recir spr pp MOV RS 255A FB3015 D 6C Chrg pp suet MOV 2863A FA3015 D 6D Recir spr pp mot htr 2 RS P 2A FA3050 E 7A Boric acid tk htr 2 CHE 6A FA3050

SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2H12N 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• I I *- NORMALLY BREAKER I LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

I BKR. APPENDIX R (R) DE-ENERGIZED (D),

I INTERMITTANT (I)

I I

• 7B* Recir spry ht ex inl MOV SW 204A FA3015 D

• 7C* Recir spr ht ex out MOV SW 205A FA3015 D 7D BORIC ACID TK HTR 2 CHE 6C FA3050 8A Lo hd saf inj lpa MOV 2890A FA3040 D

• 8B* Recir spry ht ex in MOV SW 204C FA3015 D

• BC* Rec spr ht exch out MOV SW 205C FA3015 D 8D1 4 KV SWGR BUS 2J 1PH FA3100 E 8D2 Incore inst drive D FB3040 E 9A Lo hd safe inj MOV 2890C FA3040 D 9B Rec spr ht cool lrgs connMOV SW 205A FA3040 D 9C Outs recir spr disch MOV RS 256A FA3015 D 9D Rad mon samp pp 2 SW P SC FA3040 10A Lo hd safe inj disch MOV 2864A FA3015 D

• 10B* Cont/Rly Rm Vent MOD-VS-204B FA3015 E 10C Erner make up pp 2 FW P 4A FA3100 11A Cont rod cool fan 2 VS F 60A JA3125 E 11 B1 H2A tap box FA3070 D 11B2 Spare FB3030 NA 11 C Cont rod cool fan 2 VS F 60F JA3125 E

• SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2H12S 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A

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NORMALLY ENERGIZED (E),

DE-ENERGIZED (D),

INTERMITTANT (I)

I 1A Cont spry pp disch MOV CS 201A FA3015 D

• 1B* Aux stm gen fd pp MOV FW 251A FA3015 D 1C Resid ht rmvl MOV 2720A FA3040 D 1D UPS 1A-2 JA3150 R E 2A Lo hd saf inj MOV 2885A FA3015 D 2B Cont spr pp disch MOV CS 201C FA3015 D

• 2C* Aux stm gen fd pp MOV FW 251E FA3015 D 2D Spare NA 3A Lo hd saf inj MOV 2885C FA3015 D 38 Cont spr pp suet MOV CS 200A FA3015 D

• 3C* Aux stm gen fd pp MOV Fl./ 251C FA3015 D 3D-1 UPS 2A-1 bypass HFB3100 R E 3D-2 Space HFB3070 NA 4A Chrg pp suet MOV 2270A FA3015 D 48 Ref wtr chem add tk MOV CS 202A FA3015 D 4C RCP bypass MOV 2585 FA3015 D 4D Spare NA SA Chrg pp disch MOV 2286A FA3015 D SB RCP bypass MOV 2587 FA3015 D SC Chrg pp disch MOV 2287A FA3015 D 501 480 V pwr recpt fdr FA3100 D 5D2 h2 recomb FA3100 D 6A Press relief MOV 2535 FA3015 D

• 68 6C Chrg pp disch Cont/rel rm vent MOV 2286C MOV VS 204A FA3015 FA3015 D

D

SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2H12S 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I *- NORMALLY BREAKER I LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED CE),

I BKR. APPENDIX R CR) DE-ENERGIZED CD),

I I NT ERM ITT ANT CI )

I I

6D Future NA 7A Chrg pp suet MOV 2267A FA3015 D 7B Chrg pp rec Line MOV 2275B FA3015 D 7C Boric acid fl tr MOV 2350 FA3015 D 7D Future NA 8A Lo hd saf inj MOV 2862A FA3015 D 8B Chrg pp suet MOV 2267B FA3015 D 8C Future NA

• BD Resid ht rmvl MOV 2700 FB3030 D 9A POST ACCID PURGE BLOWER 2 GIJ C 3A FA3030 D 9B Rep outlet stop MOV 2591 FA3050 D 9C Rep inl stop MOV 2590 FA3050 D 10A Boric acid trnsfr pp 2 CH P 2C FA3050 10B caustic isol vlv MOV CS 203A FB3015 D

- 10C Caus isol vlv MOV CS 203C MCP3150 D 11A future NA 11 B Rep outl stop MOV 2595 FA3050 D 11 C Rep inl stop MOV 2594 FA3050 D

SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2J11 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I NORMALLY BREAKER I -- LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

1 BKR. APPENDIX R (R) DE-ENERGIZED (D),

I INTERMITTANT (I)

I I

1A Brg cool w ht exch inl MOV SW 2018 FA3015 D 18 Turn gear motor FA3100 E 1C-1 Process vent rad mon RM GW 130 1&2 FA3030 E 1C-2 Vent rad mon RM VG 131 1&2 FA3030 E 2A Inst air comprss 2 IA C 1 JA3175 E

• 28* SPARE FA3015 NA 2C _sv wt r pp suet vv MOV SW 2028 FA3015 D 3A-1 RAD MON FDR CAB 1PH FA3030 E 3A-2 A/C Feeder 2-VS-AC-9 FA3030 R E

• 38* Spare FA3070 NA

• 3C* SPARE FA3020 NA 3D Cont rm air iso dmpr 1 VS 103C FA3015 E

• 4A-1* Inst air dryer 2 IA D FA3100 E 4A-2 RES SS TRANS FDR 3PH FA3100 E

• 48* Spare FA3020 NA 4C Auto xfr SW EDG3 ABT JA3175 E 4D Erner gen f.o. pp 1 EE P 1F FA3015 R 4E Chrg pp cool w pp 2 cc P 28 FA3040 R E

• SA* SPARE FA3020 NA 58-2 Spare HFB3070 NA SB-1 UPS 28-2 bypass 28-2 HFC3100 R E SC UPS 28-1 28-1 JA3150 R E SD Dup cond pp safe area 2 HS P3 A FA3015 6A Turb brg lift pp FA3020 E 68-1 Transformer HT T 281 FA3100 R E

SURRY POWER STATION UNIT 2 ATTACHMENT 1 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2J11 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I

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NORMALLY ENERGIZED (E),

DE-ENERGIZED (D),

I NT ERM ITTANT (I)

I I

6B-2 A/C Feeder 2-VS-AC-7 FA3040 R E 6C Chrg pp aux oil pp 2 CH P 1B FA3015 E 6D Chrg pp serv w pp 2 SW P 10B FA3040 R E

• 7A* SPARE FA3020 NA 7B Re seal w/ ret stop MOV 2381 FA3015 D 7C Rec spr ht exch MOV SW 203C FA3015 D 70-1 SEMI VITAL BUS 1PH 2SVB1 FA3100 R E 70-2 Spare FA3100 NA 8A Rec spr ht exch MOV SW 203B FB3015 D

• 8B* CN/RLY RM AC COND PP BU 1-VS-P-1B FA3050 E BC Disch to cold leg MOV 28670 FA3015 D 8D Future NA 9A Chrg pp saf inj stop MOV 2869B FA3015 D

• 9B* CN/RLY RM WCHILLER BU 1-VS-E-4A/B JA3175 R E

• 9C* CHILLED WTR OUTLET BKUP MOV PG 107B FA3015 D

• 9D* A/C CHIL WPP BKUP 1-VS-P-2B FA3050 E

• SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2J12E 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I

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NORMALLY ENERGIZED (E),

DE-ENERGIZED (D),

INTERMITTANT CI)

I I

1A Spare NA 18 Safe inj accum tk MOV 28658 FA3030 D 1C Spare FA3030 NA 1D Spare FA3060 NA 2A Future JA3175 NA 28 POST ACCID PURGE BLOWER 2 GW C 38 FA3030 D 2C Rad man samp pp 2 SW P SB FA3040 2D Erner make up pp 2 FW P 48 FA3100 3A1 Spare NA 3A2 HEAT TRACING CAB 10 3PH FA3100 E 38 Cont vac pp 2 CV P 18 FA3015 3C Cont spr pp mot htr 2 cs P 18 FA3050 E 3D Safe area samp pp 2 DA P 18 FA3015 3E AUX S G FD PP HTR 1PH 2 FW P 3A FA3050 E 4A Lo hd saf inj MOV 28628 FA3015 D 48 Lo hd saf inj rec vlv MOV 2885D FA3015 D 4C AUX FD WTR CROSS TIE MOV FW160B FA3015 R D 4D REC SPR PP MTR HTR 2 RS P 18 FA3050 E SA Chrg pp suet MOV LCV 2115D FA3015 R D SB Lo hd saf inj suet MOV 28608 FA3015 D SC Chrg line stop MOV 22898 FA3015 D SD Safe area exh fan 2 VS F 408 FA3030 E

• 6A Out rec spr pp MOV RS 2558 FB3015 D 68 Lo hd saf inj MOV 28648 FA3015 D

• 6C* Rec spr ht exch inl MOV SW 2048 FA3015 D

SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2J12E 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A NORMALLY BREAKER LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

BKR. APPENDIX R (R) DE-ENERGIZED (D),

I NT ERM IT TANT ( I )

6D Hydro recomb B MAG D

• 7A* Rec spr ht exch outl MOV SW 205B FA3015 D 7B Caustic iso vlv MOV CS 2038 FA3015 D

• 7C* Recirc spr ht exch inl MDV SW 204D FA3015 D 7D lo hd saf inj mot htr 2 SI P 1B FA3050 E

• BA* Recir spr ht exch outl MDV SW 205D FA3015 D BB Lo hd saf inj loop MDV 2890B FA3030 D BC Rec spr cool cross conn MDV SW 206 B FA3015 D 80 Rec spr pp mtr htr 2 RS P 2B FA3050 E 9A Out rec spr pp MOV RS 256B FA3030 D 98 Lo hd st disc to chg pp MOV 2863B FB3015 D 9C Spare NA 9D1 4KV SWGR HTR FDR 1PH FA3070 E 9D2 Incore inst drive 2 IC 1E FA3040 E 10A Res ht rem out isol MOV 2701 FA3030 D 10B Res ht rem out isol MDV 2720B FA3040 D 10C BORIC ACID TK HTR 3PH 2 CHE 68 FA3050 E 10D1 TRANSFORMER 1PH HT T 2B3 HFC3070 E 1002 UPS 2B-1 bypass HFB3100 R E

• SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2J12W 10CFRSO APPENDIX R REPORT, CHAPTER 9, APPENDIX A I

I -- NORMALLY BREAKER 1 LOAD EQUIP. ID EXIST. REQUIRED ENERGIZED (E),

I BKR. APPENDIX R (R) DE-ENERGIZED (D),

I INTERMITTANT (I)

I I

1A Spare NA

• 1B* Aux stm gen fd pp MOV FW 251D FA3015 D 1C Chrg pp suet MOV 2269A FA3015 D 1D1 H2A tap box 2 FA3070 D 1D2 Personnel hatch FA3020 D 2A Chem add tk disch MOV CS 202B FA3015 D

• 2B* Aux stm gen fd pp MOV FW 251B FA3015 D 2C Chrg pp suet MOV 2269B FA3015 D 2D Chrg pp aux oil pp 2 CH P1C FA3015 E 3A Cont spr pp suet MOV CS 200 B FA3015 D

• 3B* Aux stm gen fd pp MOV FW 251F FA3015 D 3C Chrg pp suet MOV 2270B FA3015 D 30 Spare NA 4A Cont spr pp disch MOV CS 2010 FA3015 D 48 Reactor cool pp bypas MOV 2586 FA3015 D 4C Chrg pp disch MOV 22868 FA3015 D 40 Rad mon samp pp 1 SW P SD FA3040 SA Cont spr pp disch MOV CS 2018 FB3015 D SB Chrg pp disch MOV 2287B FB3015 D SC React cool pp inl stp MOV 2592 FA3050 D 6A Future NA 68 cont rod cool fan 2 VS F 60C JA3125 E 6C React cool pp outl stp MOV 2593 FA3050 D 7A Chrg pp disch MOV 2287C FA3015 D 78 Spare FA3015 NA

SURRY POWER STATION UNIT 2 ATTACHMENT MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION MCC 2J12W 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A

• BREAKER I

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I I

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REQUIRED APPENDIX R CR)

NORMALLY ENERGIZED CE),

DE-ENERGIZED CD),

INTERMITTANT CI)

I I

7C Chrg p rec stop MOV 2373 FA3015 D 7D UPS 2B-2 JA3150 R E BA Press relief isol MOV 2536 FB3015 D BB Lo hd saf inj recirc MOV 2BB5B FA3015 D BC Cont rod cool fan 2 VS F60D JA3125 E 9A Safe inj ace tk disc MOV 2B65C FA3030 D 98 Caustic isol vlv MOV CS 203D

• FB3015 D 9C Saf supp htr/vent 2 VS HV 4 FA3050 E 10A Boric acid trans pp 2 CH P 20 FA3050 108 Chg pp suet vol cont tk MOV LCV 2115E FA3015 D 10C1 TRANSFORMER 1PH HT T 2B2 FB3030L E 10C2 Spare FB3100L NA

SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 1-1 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5 REFERENCE DRAWING 11448-FE-11AA-10 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A 1VB24 VERT BO REAR PNL 5 12 15A 1VB28 VERT BO SECT 1-2 YES 5 13 15A 1VB32 VERT BO SECT 1-1 5 14 15A 1VB57 VERT BO SECT 1-1 5 15 15A 1VB100 VERT BO SECT 1-1 5 16 20A 1VB126 VERT BO SECT 1-1 5 17 15A 1VB171 N.I.S. PNL 1 5 18 15A 1VB170 N.I.S. PNL 1 5 19 15A 1VB180 VNTX-R (AUX VENT PNL) 5 1VB902 2-DIP-ESRH YES 4 20 15A SPARE 21 15A 1VB206 M. B. RACK #1 TB 9 3 22 20A SPARE 23 15A 1VB220 VENT PNL UNIT #1 5 24 20A 1VB237 R.M.T. LOGIC CAB A TB 10 3 25 15A 1VB208 CHRRM PNL 5 26 15A 1VB173 BORIC ACID FLATS 17 27 15A 1VB362 VERT. BD SECT.1-1 5 1VB793 PAMR-1(POST ACCIDENT MON. RED) 5 28 15A 1VB225 S.I.A. RACK COMPT VI TB6AA 3 29 15A 1VB161 BENCH BD SECT 1-I 5 1VB801 PAMC-1(POST ACCID MON CNT PNL) 5 30 15A 1VB166 VERT BD REAR PNL 5 1VB805 PAMC-1(POST ACCID MON CNT PNL) 5 31 15A 1VB178 RCP V 9C/1 1 32 15A 1VB178 RCP V 9C/1 33 15A 1VB178 RCP V 9C/1 34 15A 1VB235 VITAL BUS FUSE BOX FB-1 35 100A 1VB912 MAIN FEED FROM UPS 1A-1 YES 3

SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAYLTS EVALUATION BUS VB 1-IA 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 3 REFERENCE DRAWING 11448-FE-11AF-4 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 15A 1VBS1 MAIN BO RACK NO. 1, TB-1 3 2 15A 1VBS102 JB-ICC-2 5 3 15A 1VBS110 ICC MP PNL TRAIN A/B, Pl 5 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 l5A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A SPARE 18 15A SPARE 19 15A SPARE 20 15A SPARE 21 15A SPARE 22 15A SPARE 23 15A 1VBS40 PROCESS RACK NO. 3 24 15A 1VBS45 PROCESS RACK NO. 3 3 25 15A 1VBS41 PROCESS RACK NO. 1 3 26 15A 1VBS46 PROCESS RACK NO. 6 3 27 15A 1VBS42 PROCESS RACK NO. 2 3 28 15A 1VBS47 PROCESS RACK NO. 6 3 29 15A 1VBS43 PROCESS RACK NO. 2 3 30 15A 1VBS48 PROCESS RACK NO. 7 3 31 15A 1VBS44 PROCESS RACK NO. 3 3 32 15A 1VBS49 PROCESS RACK NO. 7 3 33 100A 1VB904 MAIN FEED FROM UPS 1A-1 YES 3

SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 1-II 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5 REFERENCE DRAWING 11448-FE-11AB-8 APPENDIX R FIRE AREA BRK SIZE CABLE DEST! NA TI ON CIRCUIT 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A 1VB281 VERT BD SECT 1-1 5 18 15A 1VB287 VERT BD SECT 1-2 5 19 15A 1VB296 VERT BD REAR PNL 5 20 15A 1VB310 VERT BD SECT 1-1 5 21 15A 1VB332 VERT BD SECT 1-1 5 22 15A 1VB361 M.B. RACK #2 TBS & 9 3 23 15A 1VB371 N.I.S. PNL #2 5 24 15A 1VB385 FLOOD MON PNL"A"VIA FUSEBOX II 5 25 15A 1VB372 N.I.S. PNL #2 5 26 15A SPARE 27 15A 1VB755 RCP VIBRATION DET PNL 5 28 15A 1VB392 SIB RACK COMP VI 3 29 15A 1VB285 XMTTER H2-A-GW-103 5 30 15A 1VB324 BENCH BD SECT 1-1 5 1VB777 (POST ACCID MON CNT PNL)PAMC-1 5 31 15A 1VB756 CHEM REC PNL VIA FUSE BOX II 32 15A 1VB328 VERT BD REAR PNL 5 1VB781 ( POST ACC ID MON CNT PNL)PAMC-1 5 33 15A 1VB611 VNTX-R AUX VENT PNL 5 34 15A 1VB362 CHRRM PNL (CONT HI RANGE RAD. 5 1VB901 1-AMP-NM2 & 1-PRO-NM2 YES 3 (NFD-1270) GAMMAMETRICS CH-2 35 100A 1VB907 MAIN FEED FROM UPS 1B-1 YES 3

SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 1-IIA 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 3 REFERENCE DRAYING 11448*FE-11AG-4 APPENDIX R FIRE AREA BRK SIZE CABLc DESTINATION CIRCUIT 1 15A 1VBS21 PROTECTION RACK N0.13, TB-6 3 2 15A 1VBS23 BENCHBOARD SECT 1-1, B17G 5 3 15A 1VBS27 1-DAS-1, TA 3 4 15A 1VBS28 1-DAS-1, TA 3 5 15A 1VBS29 1-DAS-1, TA 3 6 15A 1VBS30 PROCESS RACK N0.11, TB-6 3 7 15A 1VBS31 1-DAS-3, TBA 3 8 15A 1VBS101 I.C.C. M.P. PNL. TRAINA/BPI 5 9 15A 1VBS104 JB*ICC-1 5 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A 1VBS68 PROCESS RACK NO. 5 TB-7 3 18 15A 1VBS76 PROCESS RACK N0.11 TB-7 3 19 15A 1VBS69 PROCESS RACK NO. 5 TB-8 3 20 15A 1VBS77 PROCESS RACK N0.11 TB-8 3 21 15A 1VBS70 PROCESS RACK NO. 8 TB-7 3 22 15A 1VBS78 PROCESS RACK N0.12 TB-7 YES 3 23 15A 1VBS71 PROCESS RACK NO. 8 TB-8 3 24 15A 1VBS79 PROCESS RACK N0.12 TB-8 3 25 15A 1VBS72 PROCESS RACK NO. 9 TB-7 3 26 15A 1VBS80 PROCESS RACK N0.13 TB-7 3 27 15A 1VBS73 PROCESS RACK NO. 9 TB-8 3 28 15A 1VBS81 PROCESS RACK N0.13 TB-8 3 29 15A 1VBS74 PROCESS RACK N0.10 TB-7 3 30 15A 1VBS82 PROCESS RACK N0.19 TB-7 YES 3 31 15A 1VBS75 PROCESS RACK N0.10 TB-8 3 32 15A 1VBS83 PROCESS RACK N0.19 TB-8 3 33 100A 1VB908 MAIN FEED FROM UPS 1B-1 YES 3

• SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 1-111 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5 REFERENCE DRAWING 11448-FE-11AA-10 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A 1VB450 VERT BO REAR PNL 5 1VB451 JB NR V.C.T. 17 16 15A 1VB456 BENCH BO SECT 1-1 5 17 15A 1VB461 BENCH BO SECT 1-1 5 18 15A 1VB481 VERT BO SECT 1-1 5 19 15A 1VB468 TRAIN "A" RPS TEST RACK 5 3

• 20 15A 1VB521 N. I .S. PNL #3 5 21 15A 1VB505A AUX VENT PNL 5 22 15A 1VB536 M.B. RACL #3 TB-7, 8 & 9 YES 3 23 15A 1VB522 N. I .S. PNL #3 5 24 15A UNSCHED. SEQ OF EVENTS RECORD VIA FBJIJ 5 25 15A 1VB540 VENT. PNL UNIT #2 YES 5 26 15A 1VB438 TB "A" NEAR AIR TEMP. MON PNL 5 1VB439 TRAIN "A" AMBIENT TEMP MON SYS 5 27 15A 1VB500 J.B. MECH EQUIP RM #1 31 28 15A 1VB543 RWST LVL XMTR HTR CONT. PNL B 3 29 15A 1VB560 VERT BO SECT 1-2 5 1VB769 PAMC-1(POST ACCID MON CNT PNL) 5 30 15A 1VB497 VITAL BUS FUSE BOX FB-111 1VB773 PAMC-1(POST ACCID MON CNT PNL) 5 31 FUT.

32 FUT.

33 15A SPARE 34 15A 1VB524 PAMC-1(POST ACCID MON CNT PNL) 5 35 100A 1VB905 MAIN FEED FROM UPS 1A-2 YES 3

• SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 1-1 I IA 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 3 REFERENCE DRAWING 11448-FE-11AF-4 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 15A 1VBS6 PROTECTION RACK N0.23, TB-5 3 2 15A 1VBS8 BENCHBOARD SECT 1-1, B15D 5 3 15A 1VBS12 1-DAS-1, TA 3 4 15A 1VBS13 1-DAS-1, TA 3 5 15A 1VBS14 1-DAS-1, TA 3 6 15A 1VBS15 1-DAS-2 TBA 3 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A 1VBS113 1-CW-PNL-1A 3 18 15A SPARE 19 15A 1VBS52 PROCESS RACK NO. 14 3 20 15A 1VBS59 PROCESS RACK NO. 17 3 21 15A 1VBS53 PROCESS RACK NO. 14 3 22 15A 1VBS60 PROCESS RACK NO. 18 3 23 15A 1VBS54 PROCESS RACK NO. 15 3 24 15A 1VBS61 PROCESS RACK NO. 18 3 25 15A 1VBS55 PROCESS RACK NO. 15 3 26 15A 1VBS62 PROCESS RACK NO. 20 YES 3 27 15A 1VBS56 PROCESS RACK NO. 16 YES 3 28 15A 1VBS63 PROCESS RACK NO. 20 3 29 15A 1VBS57 PROCESS RACK NO. 16 3 30 15A 1VBS64 PROCESS RACK NO. 23 3 31 15A 1VBS58 PROCESS RACK NO. 17 3 32 15A 1VBS65 PROCESS RACK NO. 23 3 33 100A 1VB906 MAIN FEED FROM UPS 1A-2 YES 3

SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 1-IV 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5

• BRK REFERENCE DRAWING 11448-FE-11AB-8 SIZE CABLE DESTINATION APPENDIX R CIRCUIT FIRE AREA 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A 1VB601 VERT BD SECT 1-2 5 16 15A 1VB608 VERT BO SECT 1-1 5 17 15A 1VB641 VERT BO SECT 1-1 5 18 15A 1VB688 VERT BO SECT 1-1 5 19 15A 1VB715 N.I.S. PNL #4 5 20 15A 1VB717 RPS TEST RACK 5 (TRAIN B) 3

• 21 15A 1VB373 VERT BO SECT 1-1 5 22 15A 1VB530 (POST ACCID MON CNT PNL)PAMC-1 5 1VB737 RWST LEV TRNSMIT HTG CNT PNL A 3 23 15A 1VB741 M.B. RACK #4 TB-7, 8 & 9 3 24 15A 1VB660A JB-VB1 5 25 15A SPARE 26 15A SPARE 27 15A 1VB716 N. I .S. PNL 4 5 28 15A 1VB681 JB #2 MECH EQUIP ROOM #1 31 29 15A 1VB694 UNIT #2 VENT PNL 5 30 15A 1VB687 LOAD FREQ CONT PNL/FUSE BOX IV 5 31 15A 1VB760 JB SV1 - TV-SV-102A 32 15A 1VB594 JB NR BORIC ACID TK "C" 17 1VB785 (POST ACCID MON CNT PNL)PAMC-1 5 33 15A 1VB736 RMT LOGIC CAB 11 B11 3 34 15A 1VB759 VERT BD SEC 1-1 5 1VB789 (POST ACCID MON CNT PNL)PAMC-1 5 35 100A 1VB909 MAI.N FEED FROM UPS 18-2 YES 3

• SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 1-IVA 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 3 REFERENCE DRAWING 11448-FE-11AG-4 APPENDIX R FIRE AREA BRK SIZE CABLE" DESTINATION CIRCUIT 15A 1VBS35 INSTRU RACK NO. 25, TD-4 3 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A 1VBS116 1-CW-PNL-1B 3 18 15A 1VB933 ULTRASONIC RCS LEVEL 1VB936 ULTRASONIC RECORDER 5 19 15A 1VBS86 PROCESS RACK N0.21, TB-7 YES 3

• 20 15A 1VBS93

• PROCESS RACK N0.26, TB-8 3 21 15A 1VBS87 PROCESS RACK N0.21, TB-8 3 22 15A 1VBS94 PROCESS RACK N0.27, TB-7 3 23 15A 1VBS88 PROCESS RACK N0.22, TB-7 3 24 15A 1VBS95 PROCESS RACK N0.27, TB-8 3 25 15A 1VBS89 PROCESS RACK N0.22, TB-8 3 26 15A 1VBS96 PROCESS RACK N0.28, TB-7 3 27 15A 1VBS90 PROCESS RACK N0.25, TB-7 3 28 15A 1VBS97 PROCESS RACK N0.28, TB-8 3 29 15A 1VBS91 PROCESS RACK N0.25, TB-8 3 30 15A 1VBS98 PROCESS RACK N0.29, TB-7 3 31 15A 1VBS92 PROCESS RACK N0.26, TB-7 3 32 15A 1VBS99 PROCESS RACK N0.29, TB-8 3 33 100A 1VB910 MAIN FEED FROM UPS 1B-2 YES 3

• SURRY POYER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2- I 1DCFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5

-*

REFERENCE DRAYING 11548-FE-11AA-7 APPENDIX R FIRE AREA BRK SIZE CABLc DESTINATION CIRCUIT 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE s 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A 2VB24 MAIN CONTROL BD REAR PNL 5 12 15A 2VB28 MAIN CONTROL BD SECT 2-2 YES 5 13 15A 2VB32 MAIN CONTROL BD SECT 2-1 s 14 15A 2VB57 MAIN CONTROL BD SECT 2-1 5 15 15A 2VB100 MAIN CONTROL BD SECT 2-1 5 16 15A 2VB126 MAIN CONTROL BD SECT 2-1 5 17 20A SPARE 18 15A UNSCHED NIS REGULATING XFMR (PR!) 5 19 15A 2VB902 1-DIP-ESRH YES 3 20 15A 2VB171 NI S PNL - 1 s 21 15A 2VB206 M. B. RACK #1 TB-8 4 22 15A SPARE 23 15A 2VB212 CONT HI RNGE RAD MONITOR-CHRRM 5 24 15A 2VB182 VNTX-R (AUX VENT PNL) s 2VB236 RMT (RECIRC MODE TRANSFER) 4 25 15A SPARE 26 15A 2VB173 TIC-162 BORIC ACID TK A 17 TIC-103 BORIC ACID TK C 17 TIC-2-934A, 2-SI-TK-2 17 27 15A 2VB226 BENCH BD SECT 2-1 5 28 15A 2VB225 SI-A RACK COMPARTMENT VI 4 29 15A 2VB166 BENCH BD SECT 2-1 s 2VB801 PAMC-2(POST ACCID MON CNT PNL) 5 30 15A 2VB161 MAIN CONTROL BOARD-REAR PNL 5 2VB805 PAMC-2(P0ST ACCID MON CNT PNL) 5 31 15A 2VB177 RCP V 4E/1 2 32 15A 2VB177 RCP V 4E/1 2 33 15A 2VB177 RCP V 4E/1 2 34 15A 2VB235A GAI-TRONICIS & EVAC. HORN JB 5 35 100A 2VB905 MAIN FEED FROM UPS 2A-1 YES 4

• SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2- IA 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 4

• REFERENCE DRAWING 11548-FE-11AF-0 BRK SIZE CABLE DESTINATION APPENDIX R CIRCUIT FIRE AREA 15A 2VBS1 MAIN BO RACK 1 4 2 15A UNSCHED RVLI S RECORDERS "A" TRAIN 5 DISPLAY PWR SUPPLY "A" TRAIN 5 PLASMA DISPLAY PWR SUPPLY 5 3 15A 2VBS110 2-ICC MP PNL TRAIN A/B 4 4 15A 2VBS102 JB-2-ICC-2 4 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A SPARE 18 15A SPARE 19 15A SPARE 20 15A SPARE 21 15A SPARE 22 15A SPARE 23 15A 2VBS40 PROCESS RACK NO. 1 TB-7 4 24 15A 2VBS45 PROCESS RACK N0.3 TB-8 4 25 15A 2VBS41 PROCESS RACK NO. 1 TB-8 4 26 15A 2VBS46 PROCESS RACK NO. 6 TB-7 4 27 15A 2VBS42 PROCESS RACK NO. 2 TB-7 4 28 15A 2VBS47 PROCESS RACK NO. 6 TB-8 4 29 15A 2VBS43 PROCESS RACK NO. 2 TB-8 4 30 15A 2VBS48 PROCESS RACK NO. 7 TB-7 4 31 15A 2VBS44 PROCESS RACK NO. 3 TB-7 4 32 15A 2VBS49 PROCESS RACK NO. 7 TB-8 4 33 100A 2VB906 UPS 2A-1 YES 4

• SURRY POWER STATION ATTACHMENT 2

.\

MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2-II 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5 REFERENCE DRAWING 11548-FE-11AB-7 APPENDIX R FIRE AREA BRK SIZE CABLc DESTINATION CIRCUIT 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A 2VB281 MAIN CONTROL BD SECT 2-1 5 18 15A 2VB287 MAIN CINTROL BD SECT 2-2 5 19 15A 2VB296 MAIN CONTROL BD REAR PNL 5 20 15A 2VB310 MAIN CONTROL BD SECT 2-1 5

• 21 15A 2VB332 MAIN CONTROL BD SECT 2-1 5 22 15A 2VB361 MAIN CONTROL BD RACK #2 TB-8 4 23 15A UNSCHED NIS REGULATING XFMR (PR!) 5 24 15A 2VB385 FLOOD MONITOR PNL "B" (UNIT 2) 5 25 15A 2VB278 CHRRM (CONT. HI RANGE RAD MONT 5 2VB903 ISOLATION XFMR 2-ISOX-W YES 4 26 15A SPARE 27 15A 2VB372 NIS PNL #2 5 28 15A 2VB392 SI-8 RACK COMP VI 4 29 15A 2VB285 XMTR H2-A-GW-203 5 2VB781 PAMC-2(POST ACCIDENT MON CONT) 5 30 15A 2VB328 BENCH BD SECT 2-1 5 2vBm PAMC-2(POST ACCIDENT MON CONT) 5 31 15A 2VB273 TB-B NR AIR TEMP MONITRNG PNL 5 32 15A 2VB324 MAIN CONT BD REAR PNL 5 2VB793 PAMW-2(POST ADDID MON CNT PNL) 5 33 15A 2VB602 VNTX-R AUX VENT PNL REAR 5 34 15A 2VB289 RAD MONITORING CABINET 5 35 100A 2VB909 MAIN FEED FROM UPS 2B-1 YES 4

• SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2- I IA 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 4 REFERENCE DRAWING 11548-FE-11AG-2 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 15A 2VBS21 PROCESS RACK N0.13, TB-6 4 2 15A 2VBS23 BENCHBOARD SECT 2-1, B17G 5 3 15A 2VBS27 2-DAS-1 TA 4 4 15A 2VBS28 2-DAS-1 TA 4 5 15A 2VBS29 2-DAS-1 TA 4 6 15A 2VBS30 PROCESS RACK NO. 11, TB-6 4 7 15A 2VBS31 2-DAS-3 TBA 4 8 15A 2VBS104 JB-2-ICC-2 5 9 15A 2VBS101 ICC MP PNL TRAIN A/B Pl 5 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A 2VBS68 PROCESS RACK NO. 5, TB-7 4 18 15A 2VBS76 PROCESS RACK NO. 11, TB-7 4 19 15A 2VBS64 PROCESS RACK NO. 5, TB-8 4 20 15A 2VBS77 PROCESS RACK NO. 11, TB-8 4 21 15A 2VBS70 PROCESS RACK NO. 8, TB-7 4 22 15A 2VBS78 PROCESS RACK NO. 12, TB-7 4 23 15A 2VBS71 PROCESS RACK NO. 8, TB-8 4 24 15A 2VBS79 PROCESS RACK NO. 12, TB-8 YES 4 25 15A 2VBS72 PROCESS RACK NO. 9, TB- 7 4 26 15A 2VBS80 PROCESS RACK NO. 13, TB-7 4 27 15A 2VBS73 PROCESS RACK NO. 9, TB-8 4 28 15A 2VBS81 PROCESS RACK NO. 13, TB-8 4 29 15A 2VBS74 PROCESS RACK NO. 10, TB-7 4 30 15A 2VBS82 PROCESS RACK NO. 19, TB-7 YES 4 31 15A 2VBS75 PROCESS RACK NO. 10, TB-8 4 32 15A 2VBS83 PROCESS RACK NO. 19, TB-8 4 33 100A 2VB910 SUPPLY FROM UPS 2B-1 YES 4

SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2-111 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5 REFERENCE DRAWING 11548-FE-11AA-7 APPENDIX R FIRE AREA BRK SIZE CABL~ DEST I NA TI ON CIRCUIT 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A 2VB450 MAIN CONTROL BD REAR PNL YES 5 2VB451 NEARV.C.T. 17 16 15A 2VB456 BENCH BD SECT 2-1 5 17 15A 2VB461 BENCH BD SECT 2-1 5 2VB462 RCP-V9C/5 2 18 15A 2VB481 MAIN CONTROL BD SECT 2-1 5 19 15A 2VB468 TRAIN "A" RPS TEST RACK 5 4 20 15A UNSCHED NIS REGULATING XFMR (PR!) 5 21 15A SPARE 22 15A 2VB536 MAIN BD RACK NO. 3, TB-8 4 23 15A SPARE 24 15A SPARE 25 15A 2VB556 VENT PNL UNIT #2 YES 5 26 15A 2VB500 JB IN MER #2 SIA RACK COMP VI 4 27 15A 2VB522 NIS PNL #3 5 28 15A 2VB211 PBX RM ADMIN BLDG 31 2VB769 PAMC-2(POST ACCID MON CNT PNL) 5 29 15A 2VB773 PAMC-2(POST ACCID MON CNT PNL) 5 UNSCHED TELEPHONE EQUIPMENT 30 15A UNSCHED SQUENCE OF EVENTS RECORDER 5 31 15A 2VB540 HTR CONTROL PNL "B" 4 32 30A SPARE 33 15A 2VB524 PAMC-2(POST ACCID MON CNT PNL) 5 34 15A 2VB560 MAIN CONTROL BD SECT 2-2 5 35 100A 2VB907 MAIN FEED FROM UPS 2A-2 YES 4

SURRY POWER STATION ATTACHMENT 2

.\

MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2-IIIA

..;) 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 4 REFERENCE DRAWING 11548*FE-11AF*O APPENDIX R FIRE AREA BRK SIZE CABLE DEST! NA TI ON CIRCUIT 15A 2VBS6 INST PROCESS RACK NO. 23 4 2 15A 2VBS8 BENCHBOARD SECT 2-1 5 3 15A 2VBS12 2-DAS-1 4 4 15A 2VBS13 2-DAS-1 4 5 15A 2VBS14 2-DAS-1 4 6 15A 2VBS15 2-DAS-2 4 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A SPARE 17 15A 2VBS113 2-CW*LS-102A RELAYS 4 18 15A SPARE 19 15A 2VBS52 PROCESS RACK N0.14 TB-7 4 20 15A 2VBS59 PROCESS RACK N0.17 TB-8 4 21 15A 2VBS53 PROCESS RACK N0.14 TB-8 4 22 15A 2VBS60 PROCESS RACK N0.18 TB-7 4 23 15A 2VBS54 PROCESS RACK N0.15 TB-7 4 24 15A 2VBS61 PROCESS RACK N0.18 TB-8 4 25 15A 2VBS55 PROCESS RACK N0.15 TB-8 4 26 15A 2VBS62 PROCESS RACK N0.20 TB-7 YES 4 27 15A 2VBS56 PROCESS RACK N0.16 TB-7 4 28 15A 2VBS63 PROCESS RACK N0.20 TB-8 4 29 15A 2VBS57 PROCESS RACK N0.16 TB-8 4 30 15A 2VBS64 PROCESS RACK N0.23 TB-7 4 31 15A 2VBS58 PROCESS RACK N0.17 TB-7 4 32 15A 2VBS65 PROCESS RACK N0.23 TB-8 4 33 SPACE 34 100A 2VB908 UPS 2A*2 YES 4 35 SPACE 36 SPACE

SURRY POYER STATION ATTACHMENT 2

• MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2-IV

• 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5

.

,.

REFERENCE DRAYING 11548-FE-11AB-7 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 15A SPARE 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A 2VB601 MAIN CONTROL BD SECT 2-2 5 16 15A 2VB608 MAIN CONTROL BD SECT 2-1 5 17 15A 2VB641 MAIN CONTROL BD SECT 2-1 5 18 15A 2VB688 MAIN CONTROL BD SECT 2-1 5 19 15A UNSCHED NIS REGULATING XFMR PRIMARY 5 20 15A 2VB717 REAC. PROTECTION RACK SB 4

• 21 15A 2VB736 RMT LOGIC CABINET TRAIN "8" 4 22 15A SPARE 23 15A 2VB741 MAIN BD RACK #4, TB-8 4 24 15A 2VB760 JB-SV3 EMER. SYITCHGEAR ROOM 4 25 15A 2VB530 PAMC-2(POST ACCID MON CNT PNL) 5 26 15A 2VB935 VNT PNL UNIT 2 YES 5 27 15A 2VB716 NIS PANEL #4 5 28 15A 2VB681 JB #2 MECH EQUIP ROOM #2 31 29 15A 2VB755 RCP VIBRATION DETECTOR PANEL 5 30 15A 2VB785 PAMC-2 5 2VB737 HTR CONT PNL 4 31 15A 2VB650 MAIN CONTROL BD SECT 2-1 5 2VB789 PAMC-2(P0ST ACCIDENT MON CONT) 5 32 15A 2VB594 JB NR TIC-164 BORIC ACID TK-B 17 33 15A 2VB756 AVT/ METEOROLOGICAL PNL 5 34 15A 2VB759 MAIN CONTROL BD SECT 2-2 5 35 100A 2VB911 MAIN FEED FROM UPS 2B-2 YES 4

• SURRY POWER STATION ATTACHMENT 2 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS VB 2-IVA 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 4 REFERENCE DRAWING 11548-FE-11AG-2 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 15A 2VBS35 PROCESS RACK NO. 25, TB-4 4 2 15A SPARE 3 15A SPARE 4 15A SPARE 5 15A SPARE 6 15A SPARE 7 15A SPARE 8 15A SPARE 9 15A SPARE 10 15A SPARE 11 15A SPARE 12 15A SPARE 13 15A SPARE 14 15A SPARE 15 15A SPARE 16 15A 2VB938 ULTASONIC RCS LEVEL 2 2VB941 ULTRASONIC RECORDER 5 17 15A 2VBS116 2-CW-LS-103B RELAYS 4 18 15A SPARE 19 15A 2VBS86 PROCESS RACK NO. 21 TB-7 YES 4 20 15A 2VBS93 PROCESS RACK NO. 26, TB-8 4 21 15A 2VBS87 PROCESS RACK NO. 21, TB-8 4 22 15A 2VBS94 PROCESS RACK NO. 27, TB-7 4 23 15A 2VBS88 PROCESS RACK NO. 22, TB-7 4 24 15A 2VBS95 PROCESS RACK NO. 27, TB-8 4 25 15A 2VBS89 PROCESS RACK NO. 22, TB-8 4 26 15A 2VBS96 PROCESS RACK NO. 28, TB-7 4 27 15A 2VBS90 PROCESS RACK NO. 25, TB-7 4 28 15A 2VBS97 PROCESS RACK NO. 28, TB-8 4 29 15A 2VBS91 PROCESS RACK NO. 25, TB-8 4 30 15A 2VBS98 PROCESS RACK NO. 29, TB-7 4 31 15A 2VBS92 PROCESS RACK NO. 26, TB-7 4 32 15A 2VBS99 PROCESS RACK NO. 29, TB-8 4 33 100A 2VB912 SUPPLY FROM UPS 2B-2 YES 4

SURRY POWER STATION ATTACHMENT 3 MULTIPLE HIGH IMPEDANCE FAULTS EVALUATION BUS 1SVB1 10CFR50 APPENDIX R REPORT, CHAPTER 9, APPENDIX A FIRE AREA NO. 5

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REFERENCE DRAWING 11448-FE-11AC-8 APPENDIX R FIRE AREA BRK SIZE CABLE DESTINATION CIRCUIT 1 20A 1SVB6 WASTE DISP CONTROL BD 5 2 20A 1SVB8 BORON RECOVERY CONTROL BD 5 3 20A 1SVB10 INSTR ROOM RACK MBS 3 4 20A 1SVB12 INSTR ROOM RACK MB6 3 5 20A 1SVB14 INSTR ROOM RACK MB7 3 6 20A 1SVB16 INSTR ROOM RACK MB8 YES 3 7 20A 1SVB18 INSTR ROOM RACK WD1 3 8 20A 1SVB20 INSTR ROOM RACK WD2 3 9 20A 1SVB22 INSTR ROOM RACK WD3 3 1SVB23*CATALYTC RECOMB&CNT PNL 17 10 20A 1SVB24 INSTR ROOM RACK BR1 3 11 20A 1SVB26 INSTR ROOM RACK BR2 3 12 20A 1SVB28 INSTR ROOM RACK BR3 3 13 20A 1SVB80 1-GDC-17 TEST PNL 31 14 20A 1SOV823 1-MS-BC-1 YES 5 15 20A 1SVB156 EMERGENCY SWITCHGEAR ROOM #1 3 16 20A 1SVB151 CONT. RM SHIFT SUPV CONSOLE YES 5 17 20A UNSCHED. CONT. RM SECONDARY LIGHTING 5 18 20A 1SVB41 TURBINE TURN GEAR CONTROL 1-TG 19 20A 1SVB49 IDEWCEL PWR SUPPLY ON COL'M 20 20A 1SVB42 28VDC RECTIFIER FEED FOR TURBN 21 20A 1SVB47 FT BR-132 SEL SWITCH@ J.B.

22 20A 1SVB73 WEATHER& BATTERY RECRDR PNL U1 4 23 20A 1M351 JB NEAR HTG&VNT UNIT 1-VS-HV-4 24 20A SPARE 25 20A 1SVB72 INTAKE SUPV PNL & 5 CNTMT HIGH RNG MONIT. PNL 5 26 20A 1SVB66 BENCHBOARD SEC 1-2 5 27 20A 1SVB5 MAIN XFMR RELAY PNL 3 28 20A 1SVB4 UNIT #1 LOAD FREQ. CONTROL PNL 5 29 20A SPARE 30 20A 1SVB19 E.H. GOVERNOR CONTROL PNL FD. 3 31 20A SPARE 32 50A 1SVB50 PRIMARY OF SOLA XFMR RPI RACK2 3 33 30A 1SVB44 JB NEAR COLM T22 AT FLOWMETERS 31 1SVB52 JB NEAR COLM T18 AT FLOWMETERS 31 34 20A 1SVB58 TB 6C.6, 7 & 8 1SVB59 35 20A 1VMS1 ACOUSTICAL MONIT. PNL 31 36 20A 1HTEMP1 480V EMER SWGR BUS 1H COOL FAN 3 37 20A 1JTEMP1 480V EMER SWGR BUS 1J COOL FAN 3 38 60A UNSCHED. 2SVB1 5