ML20094E736

Responds to Commitment Made by License at Station Blackout follow-up Insp Exit Meeting on 950811.Commitment Was to Complete Load Flow Calculations for 23 Kv Offsite Source by 950911 & Provide Results to NRC

ML20094E736
Person / Time
Site:	Pilgrim
Issue date:	09/25/1995
From:	Boulette E BOSTON EDISON CO.
To:	Ruland W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
95-101, NUDOCS 9511070388
Download: ML20094E736 (60)

Text

{{#Wiki_filter:- _ _ _ _ _ _ Boston sidson Pdgern Nuclear Power Staten Rocky Hdi Road Pfymouth. Masschusetts 02360 4 E. T. Boulette, PhD 3 Senor Vice President - Nudear September 25, 1995 BECo Ltr. #95-101 U.S. Nuclear Regulatory Commission Region i 475 Allendale Road King of Prussia, PA 19406 Attn: William Ruland Docket No. 50-293 Ucense No. DPR-35 Station Blackout Follow-up Inspection dated August 5-11,1995 NRC Inspection No. 95-16. 23Kv Load Flow Calculations Dear Sir This letter is in response to the commitment made by Boston Edison Company (BECo) at the Station Blackout Follow-up Inspection exit meeting on August 11, 1995. The commitment was to complete [ load flow calculations for the 23Kv offsite source by September 11,1995, and provide the results to the NRC thereafter by a letter. We have coropleted the subject calculation, and a copy of the calculation is attached as requested oy the NRC Inspector, Mr. George Morris. The results of the calculation are as follows: ,_For safe shutdown conditions, both safety buses were energized with Turbine Trip loads. The source voltage during peak load condition was used for worst case. The calculated available voltages at the safety related loads are above the minimum required voltages for starting and running conditions. The load flow study was performed for the LOCA scenario, with one bus energized and with the source voltage peak load condition. The calculated available voltages at safety related loads exceed their minimum required voltages. Although the 23Kv source is not credited to satisfy LOCA mitigation with loads from both safety botas, the calculations performed concluded al! required safety loads will ) start and run property with both emergency LOCA loads. Shutdown transformer i loading, however, will be above its continuous rating but below the overload rating. The momentary overload will result in a minimal loss of transformer life. 670CG ~ 9511070308 950925 ~ PDR ADOCK 05000D3 ,/ # 4 u 1

This lett r compi;t;s our commitment mada et the cxit meeting on August 11,1995. Please contact Mr. Walter Lobo of our Regulatory Relations Department, at (508) 830-794G, J you have any further questions. E. T. Boulette, PhD ETB/WGURap95/SBO9517 Attachment cc: M;. R. Eaton, Project Manager Division of Reactor Projects - 1/11 Mail Stop: 14D1 U. S. Nuclear Regulatory Commission 1 White Flint North 11555 Rockville Pike Rockville, MD 20852 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Senior Resident inspector Pilgrim Nuclear Power Station

,i CALCULATION COVER SHEET PILGRIM NUCLEAR POWER STATION in l SHEET 1 OF KSO l CALC. NO.161 REV.o FILE NO. eJ/4 SR RTYPE NSR O

Subject:

23kv Offsite Source Load Flow Study Preliminary Calc. O Finalization Due Date: Discipline Division Manager: Brucegrd Approval /s/: Q Date: gig Final Calc. ~ N Independent Reviewer Lisa Hansen /s/.d.hW Statement Attached @ Page(s) By: Swapan Das Date Ch'k'd Lisa Hansen Date Agreed q /g \\q9 QS \\ /s/J g, q/ggg /s/ y, g q All a, This design analysis O DOES, @ DOES NOT require revision to affected design documents. Affected Design Documents: A PDC 0 IS, glS NOT Required. A Safety Evaluation O IS. @ IS NOT Required. See attached preliminary evaluation checklist. This design analysis O DOES, $DOES NOT affect the piping analysis index (PAI). If the pal is affected, initiate a revision to Calculation M561. Minor revisions made on pages O/A of this calculation. See next revision. U/A Replaces Calc. No. g/A Voided By Calc. No. O Or Attached Memo i CALCCOV. DOC NEsD 3 05 Rev 19

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 2 of 58 Q4 Non Q 1. Purpose 1 The purpose of this calculation is to perform a load flow study for the 23kV offsite source. This calculation will utilize the " DAPPER" program. The study will l ensure that the proper voltage exists at each safety related load to operate as required under the following different :,cenarios: CASE A: Turbine Trip with the Manomet transformer in service and the series i capacitor out of sersice CASE B: Turbine Trip with the series capacitor in service and the Manomet transformer out of service CASE C: LOCA wMoad shed with only one bus energized (swing bus not connected) with the Manomet transformer in service and the series capacitor out of service CASE D: LOCA wMoad shed with only one bus energized (swing bus not connected) with the series capacitor in service and the Manomet transformer out of service CASE E: LOCA wAoad shed with both buses energized with the Manomet transformer in service and the series capacitor in service CASE F: LOCA wAcad shed with only one bus energized with the swing bus connected with the Manomet transformer in service and the series capacitor out of service 2. Summary of Results and Recommendation The results of the calculation for Turbine Trip and LOCA are given in Table 1, Table 2, Table 3, and Table 4. Only safety related MCC's and only safety related loads are evaluated. Turbine Trio From Table 1, it can be concluded that during CASE A) all required safety related i loads will start and run at the lowest expected source voltage (i.e. during peak load conditions). The available voltages are well above the minimum required voltages. For CASE B) all required safety related loads will operate properly at the lowest expected source voltage. However, the available voltage is marginal. Aho A5 and A6 bus voltages will be below the degraded voltage alarm setpoint. This calculation assumes that the operator will reset the alarm prior to initiating any manual starts. At this time, the bus voltages will be above the alarm reset value. The reset value at 4.16kv level corresponds to a voltage of greater than 22.2kv at the source. Calculations were also performed at this source voltage. The ) results indicate that the available voltages will be well above the minimum required for motor starting and running conditions. s

0 BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 3 of 58 Q4 Non Q I LOCA w/loadshed with only one bus enerzi ed A review of Table 2 indicates that for CASE C), the available voltages for all safety loads are well above the minimum required voltage. For CASE D) all safety loads will start and run properly, the available voltages are above the minimum required. Also as mentioned in page 15, during steady state loading the bus voltage will be below the low voltage alarm set point. LOCA w/loadshed with both buses enerzi:ed The 23kv source is not required to satisfy LOCA mitigation with loads connected to both emergency buses. However this calculation was performed to show that this offsite source is capable of accomodating LOCA loads on both emergency 4 buses. The calculation was performed using the source voltage available with both the Manomet transformer and PNPS series capacitor in service. From Table 3, it can be concluded that all required loads will start and run with adequate voltage margin. However, during the starting ofload block-1, the voltage available at MOV's MO202-5 A/5B, M01001-28B and M01001-29B is below that which is required. ] Subsequently calculations were performed which indicate that after a slight time i delay, the bus voltage will have improved (i.e. after 4ky motors have started and are at steady state) the MOV's will have suflicient voltage to start. 1 Although the total calculated loading of 5.3MVA on the Shutdown transformer j during steady state condition (without manual loading) exceeds it's continuous rating of SMVA, this loading is below the overload rating of 5.6MVA. The momentary overloading will result in a minimal loss of the transformer life. LOCA w/ load shed with only one bus enereized w/ Swine bus B6 connected. Although the swing bus B6 will not be connected to the affected bus by design, this study was performed with the assumption that bus B6 is connected to the } \\ affected bus. l A review of Table 4 indicates that the available voltages for all safety related loads I are above the minimum required voltages for starting and running conditions. The available bus voltage during steady state condition will be above the degraded voltage setpoint. t 4

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 4 of 58 QV Non Q 3. Method of Solution

a. Identify allloads (i.e. both safety and non safety) that will be operating during the Turbine Trip and LOCA w/ load shed scenarios.

b. Identify the source voltages to be used in the calculation.

c. Input the data into the DAPPER program.

d. Perform the load flow studies at the different source voltages for the different scenarios (see Section 1 of this calculation for the different scenarios which will be performed in this calculation) using the " DAPPER" program.

e. Review the results to ensure proper voltage is available at each safety related load. Summarize the results in Section 2 and provide recommendations, if any.

4. Input Data and Assumption

a. All loads that will be operating were obtained from calculation PS65A.

b. Power factor values for each load were assumed to be the same as those used in calculation PS65A.

t

c. Source voltages (i.e. voltage at Shutdown transformer terminal) were obtained from Attachment "A" Light and Peak load voltages were used.

d. 23kV is the delayed offsite source as required per GDC17 to maintain reactor coolant pressure boundary limit. The 23kv offsite source is required to supply both trains of Shutdown and 1 train of LOCA loads.

e. For LOCA scenarios with only one bus energized, bus "A5" was chosen as "A5" i

i loading is normally higher than "A6" bus. At PNPS 23kV is also considered as a reliable backup for one Emergency diesel generator (i.e. LCO situation when one EDG is out of service and hence one CSCS bus will be energized).

f. Only loads which will operate for the Turbine Trip scenarios and/or LOCA w/ load shed scenarios will be evaluated. Loads which are off for these scenarios (as shown in PS65A) will not be evaluated.

l

o BOSTON EDISON CALCULATION SHEET i Calculation No. PS-161 Prepared by: Swapan Das l Rev. 0 Date 9/8/95 Checked by: Lisa Hansen i Sheet 5 of 58 Q4 Non Q I

g. Due to the nature of the " DAPPER" program, many loads which do not operate appear in the " Bus Special Study Data" section of the printouts. These loads have 1

not been verified as they are removed from the calculation by taking the appropriate feeder out of service. i

h. This calculation only considers loads fed from safety related load centers / busses as the shutdown transformer is only connected to safety busses.

• All Turbine Trip scenarios include load centers B1, B2, and B6 and all the loads fed from them. It is a::sumed B1 feeds B6.

+For LOCA w/ load shed scenario, three separate studies were performed. One study with only "A5" connected, one w/o swing bus connected, one study with both buses "A5" and "A6" connected, one w/A5 connected i w/ swing bus connected.

j. For any 480v load requiring revision or addition, a demand factor of 90% (0.9 multiplier) was assumed. This is consistent with calculation PS65A.

4 1

k. The plant is assumed to have been operating normally at 100% power prior to the event.

4

1. It is assumed that no system testing is on going prior to the event and all systems are in their normal line-up (i.e. no system failure assumed).

m. All manual action taken by the operators will be assumed to occur 10-15 minutes into the event.

n. When "A5" and "A6" are energized after a dead bus transfer, only one TBCCW pump (P110A) will start after a 20 second time delay. This pump is capable of

_ maintaining system pressure. The redundant pump.(P110B) will not be started as long as P110A is running.

o. Per FSAR section 10.7.5, the maximum number of Salt Service Water pumps that are required during a LOCA is 2 pumps (i.e. I pump per loop ) and 4 pumps during shutdown. The fifth pump P208C is not required to mitigate any design basis accident or any transient.

p. During normal power operation, only one CRD pump is running. During the dead bus transfer the pump will be tripped and will remain in the trip position. In Turbine Trip though it is not required, the operator may stan one CRD pump manually. However during LOCA it will receive load shed signal.

v-~--w,, a v -7, m.---

BOSTON EDISON CALCULATION SIIEET I ' Calculation No. PS-161 Prepared by: Swapan Das l Rev. 0 Date 9/8/95 Checked by: Lisa IIansen Sheet 6 of 58 Q4 Non Q

q. While preparing this calculation, the cable impedance input for the feed from B2 l

to B18 was found to be incorrect. Subsequently an interim revision to calculation PS64 was issued. The cable impedance was recalculated and documented in PS-l 64-3. The revised value was entered into the DAPPER program. l

r. The minimum required voltages as mentioned in Table 1, Table 2, Table 3, and l

Table 4 are obtained from PS65 and PS65A unless otherwise noted. l

s. The SBGT system is not required during loss of offsite power nor during Turbine Trip, however by design the system will start and hence was included in the calculation.

l

t. In Turbine Trip motor starting cases, PS65A assumed the start of P208C at l

MCC B10 even though it clearly states that P208C is not required. This calculation will start the largest operating load (i.e. X101) at MCC B10 and not P208C.

u. At MCC B17, loads for B1735 and B17101 are 15hp and 30hp respectively

[ according to dwg.SE155 Sh2,Rev.E44. Similarly at MCC B18 load for B18101 is j l 30hp These revised loads will be used in lieu of the loads used in PS65 and PS65A.

v. In Turbine Trip, PS65 and PS65A assumes both Control Room Air conditioning l

and CREAF system are operating. The CREAF system is the only manually j operated load which will be started in the event of the loss of air conditioning 1 system. l 5. Calculation The calculation will be performed for the following scenarios with different source voltages (as defined below): 4 Turbine Trip transients LOCA w/ load shed - shutdown transformer only connected to 4.16 KV safety l bus "A5" (swing bus not connected) i LOCA w/ load shed-shutdown transformer connected to 4.16KV safety buses "A5" and "A6" LOCA w/ load shed - shutdown transformer only connected to 4.16 KV safety I bus "A5" (swing bus connected)

BOSTON EDISON CALCULATION SHEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa Hansen I, Sheet 7 of 58 Q4 Non Q a) TURBINE TRIP CASE A (Source voltage 22.4 kv-23.8 kv ) From Attachment "A" with the Manomet transformer in service and the PNPS 1 series capacitor out of service, the expected voltage at the primary side of the shutdown transformer is between 22.4 kv (during peak load) and 23.8 kv (during j light load). The following is the tabulation of the individual MCC's and loads that are connected to "AS" and "A6". These values were obtained from PS65 A, page 29 and 30. j MCC B15: 276 +jl49 KVA MCC B17: 138 + j75 KVA i MCC B29: 1+j0 KVA MCC B17A: 8 + j4 KVA MCC B14: 320 + jl73 KVA MCC B18: 119 + j64 KVA MCC B18A: 8 + j4 KVA MCC B28: 118+ j67 KVA MCC BIO: 233 +jl26 KVA MCC B20: 19 + jl0 KVA P209A 162+j87 KVA P110A 80 + j46 KVA G23 66 +j35 KVA SWYD. AUX. 66 +j36 KVA The above loads will be revised to reflect any addition or deletion of loads that have taken place since calculation PS65A was done. Calculation PS65A was calculated for the scenario where PNPS is powered via the Startup Transformer. \\ Hence loss of voltage was not assumed while making fast transfer. In this calculation loads will be connected to the Shutdown Transformer ( i.e. via 23KV ). Only safety buses A5 and A6 will be connected. The transfer from the Unit Aux. Transformer to the Shutdown Transformer is a dead bus transfer. Both buses will suffer a loss of voltage momentarily. Hence some of the loads will be revised accordingly.

BOSTON EDISON CALCULATION SIIEET Calculation No. PS.161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 8 of 58 Q4 Non Q The revised loading is as follows: MCC B15: 276 + i149 KVA no change from PS65A MCC B17: MCC cubicle B1735 and B17101 loads decreased by Shp and 10hp respectively (see Section 4, item u). Also B17A load was included in B17 loading in PS65A. The revised loading: 138 + j75 = 157 KVA ( PS65A ) - 9 KVA ( B17A load of 10

• 0.9 )

- 9 KVA ( B17101 load of 10hp

• 0.9 )

- 4.5 KVA (.B1735 load of Shp *0.9 ) 134.5 KVA = 118 + i64 MCC B29: 1+i0 no change from PS65A MCC B17A: 8 + i4 no change from PS65A MCC B14: The Standby Gas Treatment loads were not included in PS65A. These loads are automatically started coincident with train "A" SBGT and shut off after 65 seconds if train "A" establishes the required flow. The revised loading: 320 + jl73 = 363,75 KVA ( PS65A ) + 13.5 KVA (B1426 load of15hp

• 0.9 )

+ 19.3 KVA (B1416A load of 21.4kw

• 0.9 )

s 396.55 KVA = 349 +i 188 MCC B18: MCC cubicle B18101 is decreased by 10hp (see Section 4, item u). Also B18A load was included in PS65A. The revised loading: 119+j64 = 135 KVA ( PS65A) 9 KVA ( B18101 load of 10hp

• 0.9 )

9 KVA ( B18A load of 10 KVA

• 0.9 )

I17 KVA= 103 + iS6 MCC B28: 118 + i67 no change from PS65A MCC B18A: 8+i4 no change from PS65A

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. 0 Date 9/8/95 Checked by: Lisa IIansen Sheet 9 of 58 Q4 Non Q MCC BIO: 233 + il26 no change from PS65A MCC B20: 19 + ilo no change from PS65A P209A: 162 + i87 no change from PS65A P110A 80 + i46 no change from PS65A G23: 66 + i35 no change from PS65A SWYD AUX. 66 + i36 no change from PS65A The " DAPPER" runs are then performed with the inputs as calculated above. The following is the list of" DAPPER" runs for different conditions. Only the lowest minimum source voltage of 22.4 kv was used. If all loads can operate satisfactorily at source voltage of 22.4 kv, calculation with higher voltage (i.e. 23.8kv) is not required / performed.

1. Steady-state loading with voltage of 22.4kv. This loading includes all automatic as well as manually operated loads that will be running. Loading for each MCC was taken from above. Results of the run are shown in Attachment "B"

2. Motor starting for each MCC: Verification that the largest motor on each MCC will start will prove that all other motors will have sufficient MCC voltage to start.

MCC B15: The largest motor on this MCC is a 100 hp Salt Service Water Pump (P208A, P208B). One pump (P208A) will automatically start after the voltage recovery. Pump P208B is then manually started by the operator if necessary. The loading on MCC B15 prior to start of this P208B pump is: 204 +jl10 KVA from PS65A, Page 70 The starting KVA for this motor is: 192 +j599 KVA from PS65A Page 70 s Results of the run are shown in Attachment "C" MCC B14: Similar to B15. Salt Service Water pump P208E will be started for this MCC. The loading on MCC B14 prior to start of this pump is 396.55 KVA from Page 8 - 81.72 KVA (P208E load of 90.8 x 0.9) 314.83 KVA = 277 + il49 KVA [

. ~ _ _. -. _. _ BOSTON EDISON CALCULATION SHEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa Hansen Sheet 10 of 58 QY Non Q The starting KVA for this motor is 192 +j599 KVA (PS65A, Page 65) Results of the run are shown in Attachment "D" MCC B17: the largest load in this MCC is P207A, a 50 hp motor. This motor is not required to operate for this scenario. However for conservatism this motor will be started. The starting KVA of this motor is: 123 +j304 KVA (PS65A, Page 74) Results of the run are shown in Attachment "E" MCC B18: Similar to MCC B17. P207B will be started. The starting KVA of this motor is: 123 + j304 KVA (PS65A, page 76) Results of the run as shown on Attachment "F" MCC B20: The largest motor in this MCC is M01001-28B which is an isolation valve. This loading was not included in the steady state loading since it is a short term load (30 sec. typical). The starting KVA of this motor is: i 213 + i284.6 KVA (PS65A page 78) \\ Results of this run as shawn on Attachment "G" MCC BIO: The largest load on this MCC that will be operating is Turning Gear X101, a 60 hp motor. This load is manually started and was included in the steady state loading. The loading on MCC B10 prior to start of X101 is 186 + i100 KVA (PS65A, Page 81)

BOSTON EDISON CALCULATION SHEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa llansen Sheet 11 of 58 Q4 Non Q The starting KVA of this motor is: 140 + j365 KVA (PS65 A,' Page 81) Results of this run are shown in Attachment "H" l The results of each run are shown in Table I for comparison'with the minimum required voltage for each load. This is to ensure that each load will start and run as required. b) TURBINE TRIP CASE B (Source voltage 21.3-24.0 kv) From Attachment "A", with the Manomet transformer out of service and PNPS series capacitor in service, the expected voltage at shutdown transformer is between 21.3 kv (during peak load) and 24.0 kv (during light load). " DAPPER" runs will be performed utilizing both source voltages. Steady state loading as calculated in A) will be used. The steady state loads are: MCC B15: 276 + il49 KVA MCC B17: 118 + i65 KVA MCC B17A: 8 + i4 KVA MCC B29: 1 + i0 KVA MCC B14: 349 + il88 KVA MCC B18: 102 + iS5 KVA MCC B18A: 8 + i4 KVA MCC B28: 118 + i67 KVA MCC BIO: 233 + il26 KVA MCC B20: 19 + J10 KVA i P209A: 162 +j87 KVA G-23: 66 + i35 KVA SWYD. Aux: 66 + i36 KVA The results of the DAPPER runs with source voltages of 21.3kv and 24.0 kv are shown in Attachments "AA" and "AB" respectively. Figure I summarizes the results of DAPPER computer runs Attachments "AA" and "AB" From figure 1, it can be seen that with source voltage of 21.3 kv, the 4160 kv buses will set a low voltage alarm. Currently PNPS procedure 2.4.144 (degraded voltage)is being revised to instruct the operator to shed non-essential loads to improve bus voltages. The steady state calculation includes both essential and non-essential loads.

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa Hansen I Sheet 12 of 58 Q4 Non Q i It is assumed that the bus voltages will be improved to be above the reset value of the undervoltage relays. The reset value of these undervoltage relays is approximately 3986 volts. The corresponding 23kv voltage is approximately 22.3 kv, for conservatism and margin this calculation uses 22.2 kv as the source voltage This source voltage of 22.2 kv will be used to start large motors at each MCC. For the steady state operation, from Figure 1, at 22.2 kv, the minimum available MCC bus voltage is greater than 440 volts which is well above the minimum required MCC bus voltage. For motor starting in each MCC, the same loading as used in "A" was used with a source voltage of 22.2 kv. The results of each run are shown in Attachment AC for B15, Attachment AD for B14, Attachment AE for B17, Attachment AF for B18, AG for B20 and Attachment AH for B10. The results of the steady state and motor starting runs are shown in Table I to compare against the minimum required voltage for each load. This is to ensure that all required safety related loads will start and run as required. c) LOC A w/ load Shed Study. Only " A5" Energized (swing bus not connectedj-CASES C AND D (Source voltage: 23.8 - 22.4 kv, Manomet transformer in, series capacitor out source voltage: 24.0 - 21.3 kv series capacitor in and Manomet transformer out) This calculation will use the lowest source voltage values of 22.4 and 21.3 kv (peak load conditions). The following is the tabulation of the individual MCC's and loads that are connected to the "A5" Bus. The values were obtained from PS-65 A, Page 35 and 36. This loading includes all automatic loads and manually 4 operated loads that may be operating. MCC B10: 135 +j73 KVA MCC B20: 19 +jl0 KVA MCC B15: 307 + jl66 KVA MCC B17: 52 +j28 KVA P110A: 80 +j46 KVA P203A: 639 + J309 P203C: 639 +j309 KVA P215A: 604 +j318 KVA G23: 66 +j35 KVA

BOSTON EDISON CALCULATION SHEET j 1 Calculation No. PS-161 Prepared by: Swapan Das l Rev. 0 Date 9/8/95 Checked by: Lisa Hansen l Sheet 13 of 58 Q4 Non Q j The above loading will be revised to reflect the scenario assumed in this l calculation. In this scenario, a DB A.LOCA was assumed with Emergency Diesel Generator "A" out of service. Hence swing bus B6 will be lined up with the B Loop. Bus "A5" will be energized in approximately 12.5 sec. upon LOCA w/ loop by the Shutdown Transformer. All large ECCS pumps willi.e sequentially loaded in 5 second intervals (approximately). All non-essential loads will be tripped via the load shed logic. Pump Pl 10A will not be energized until 20 seconds after vohage recovery. Swing bus B6 will still be connected to the "B" loop. All 480V large motors (Salt Service Water and RBCCW) will be loaded after time delays. Also i various motor operated valves (short time loading, typically 30 sec) will be operating at different times during this scenario. MOV loads will be included as starting loads but will not be included in Steady State loading.

• Starting ofloads at various time intervals When power is available,(i.e. at approximately 12.5 seconds) the following loads (load block-1) will be at steady state or will be starting (from PS-65A, Pg. 88,89) via AS bus:

l MCC B15: 47 +j25 Steady state MCC Bl7: 52 +j28 Steady state MCC B17: 42 +j55 Starting MCC B15: 84 +jl07 Starting P215A will also start at approximately 12.5 seconds. The starting load for this motor is 840 +j3910 KVA(PS65A). The DAPPER program was run with the above loading. The results are in Attachment SAB for 21.3 KV and Attachment SAA for 22.4kv. From the 4 results, all loads will start and accelerate with the exception of VEX 210A. However, cables associated with this load were replaced via PDC 93-05. A voltage drop calculation was performed for the replacement cables using a Lotus Spreadsheet. Using the Lotus spreadsheet set up in calculation PS113, it was verified that VEX 210A will be able to start with 410v available voltage at MCC B15. See Attachment AAC. e Next loads (load block-2) that will be starting are: P203A: 840 +j3910 (PS65A) MCC B17: M01400-25A 74 +j99 (PS65A)

BOSTON EDISON CALCULATION SHEET 3 I* Calculation No. PS-161 Prepared by: Swapan Das Rev. 0 Date 9/8/95 Checked by: Lisa llansen Sheet 14 of 58 Q4 Non Q l Steady state loading including loads that previously started is (valve l loading neglected): l MCC B17: 52+j28 (from previous mn) MCC B15: 47+j25 (from previous run) =53.23 kva +1.35 kva (B1546 steady state load of 1.5hp*0.9, previously started) +14.35 kva (B1516A steady state load of 16kw*0.9, previously started) +13.50 kva (B1526 steady state load of 15hp*0.9, previously started) 82.50 kva = 73+j39 kv P215A: 604+j318 kva The program was run with the above input. The results are in Attachment SAC for 22.4 kv and Attachment SAD for 21.3 kv. Results indicate that at 22.4 kv both the motor operated valve and P203 A will start. At 21.3 kv M01400-25A will start, however the available voltage is marginal (402.3 required vs. 411 available) eNext load that will start is P203C. P203C: Starting load: 840 + j3910 KVA Steady State Loading: MCC B15: 73 +j39 i MCC B17 52 + j28 P203A: 639+j309 Results of both runs indicate (Attachments S AE and SAF) that P203C will start. s

• The next pump is P208A, salt service water pump which will start at 25 seconds.

P208A starting at B15: 192 + j599 KVA

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa llansen Sheet 15 of 58 Q4 Non Q The steady state loading: MCC B15: 73 +j39 MCC B17: 52 + j28 P110A: 80 + j46 (this pump was started at 20 seconds and is now at steady state) P203A: 639+j309 P203C 639+j309 The results of both runs indicate that P208A will start (Attachment SAG, SAH) e The last pump that will be sequenced on is P202A, RBCCW pump. ] P202A: 135 + j353 on B15 (PS65A, pg. 66) MCC B17: 52 +j28 MCC B15: 73 +j39 = 82.5 KVA +81.72 KVA(P208A steady state load 90.8 x 0.9) 164.22 KVA- = 144.5 +j78 = 145 + j78 P110A: 80+j46 P203A: 639+j309 P203C: 639+j309 The results of both runs indicate that P202A will start (Attachment S AI, S AJ) This completes the start sequence. eThen the steady state loading was calculated for all loads automatically connected f to this bus. Steady state loading is as follows from the previous run: MCC B17: 52 +j28 ) MCC B15: 145 + j78 = 164.22 KVA 50.94 KVA (P202A load) 215.16 KVA = 189 +jl02 The DAPPER runs were performed and results are in Attachments AAA and AAB. A review of results indicate that at 22.4 kv, all loads will run with adequate margin. The voltage at A5 will be slightly above the bus undervoltage alarm set point.

BOSTON EDISON CALCULATION SHEET Calculation No. PS.161 Prepared by: Swapan Das ~ Rev. O Date 9/8/95 Checked by: Lisa Hansen j Sheet 16 of 58 Q4 Non Q The run at 21.3 kv indicates that all 480v loads will operate marginally. All 4160v l loads will operate, however the available voltage will be only slightly above 90% (90.65%). The results also indicate that the bus voltage will be below the set point of the undervoltage alarm (approx.3950v). This will set an alarm in the control room. Currently PNPS procedure 2.4.144 is being revised to instruct the operator to take proper action in the event that this alarm is received when the plant is in this configuration. According to Attachment A, during peak loading with the Manomet transformer out, the voltage will be between 24 kv and 21.3 kv. The 1 source voltage of 21.3 kv used is the worst case voltage during the peak loading. i In reality, the voltage will be somewhat higher than 21.3 kv. 1 The above steady state loading only includes the automatic loads which are required to mitigate a LOCA. However other manually operated loads could be started by the control room operator. These loads are brought on later on in the scenario after an ECCS pump has been manually tripped. In this calculation we will start an additional SSW (P208B) pump without tripping an ECCS load. Also during the start of this pump we will load an additional RBCCW pump (P202B) as a steady state load 1 l The steady state loading as follows are from the beginning of section C: MCC B17: 52+ j28 KVA i P110A: 80+j46 KVA l P203A 639+j309 KVA P203C 639+j309 KVA P215A 604+j318 KVA MCC B15: 307+ jl66 KVA (includes P208B and P202B) = 349.0 KVA 81.72 KVA (P208B loading of 90.8

• 0.9) 236+jl27 KVA Also the starting load of P208B is 192+ j599 KVA s

The DAPPER run was performed and the results are in Attachment AAE. The j results show that P208B will start properly at 22.4 KV. Also the steady state loading including P208B at steady state was run. The results in attachment AAD show that the available voltage is higher than the minimum required. The manualloading with source voltage of 21.3 kv was not performed. As previously mentioned for the automatically connected loads, the 4.16 KV bus voltage is well below the alarm set point. It is assumed that the operator will clear the alarm prior to initiating any manual starts. The alarm reset point is approximately 3986 volts. The 3986 volts corresponds to approximately 22.4KV. Attachment AAE shows that P208B will start at 22.4KV. 41

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. 0 Date 9/8/95 Checked by: Lisa IIansen Sheet 17 of 58 QV Non Q d)LOCA w/ load Shed Study"A5" and"A6" Energized - CASE E i (Source voltage: 24.6 - 23.8 kv, Manomet transformer in, and series capacitor in) This calculation will use the lowest source voltage value of 23.8kv (peak load 4 conditions). The following is the tabulation of the individual MCC's and loads that are connected to "A5" and "A6" Bus. The values were obtained from PS-65 A, Page 35 and 36. This loading includes all automatic loads and manually operated loads that may be operating. MCC B10: 135 +j73 KVA MCC B14: 350+jl89 KVA l MCC B20: 19 + jl0 KVA MCC B18: 50+j27 KVA MCCBI5: 307 + jl66 KVA P203B: 639+j309 KVA MCC B17: 52 + j28 KVA P203D: 639+j309 KVA P110A: 80 +j46 KVA P215B: 604+j318 KVA i P203A: 639 +j309 KVA 4 P203C: 639 +j309 KVA P215A: 604 +j318 KVA G23: 66 +j35 KVA 3 The above loading will be revised to reflect the scenario assumed in this calculation. In this scenario, a DBA LOCA was assumed with both Emergency Diesel i Generators out of service. The swing bus B6 is lined up with the A Loop. Both buses will be energized in approximately 12.5 sec. upon LOCA w/ loop by the Shutdown Transformer. All large ECCS pumps will be sequentially loaded in 5 second intervals (approximately). All non-essential loads will be tripped via the load shed logic. Pump P110A will not be energized until 20 seconds aner voltage recovery. Swing bus B6 will still be connected to the A loop. The vital M-G set from the swing bus will not be connected until 120 second. All 480V large motors (Salt Service Water and RBCCW) will be loaded afler time delays. Also various motor operated valves (short time loading, typically 30 sec) will be operating at different times during this scenario. MOV loads will be included as starting loads but will not be included in Steady State loading. eStaning ofloads at various time intervals When power is available,( i.e. at approximately 12.5 seconds) the following loads (load block-1) will be at steady state or will be starting (from PS-65A. Pg. 88,89) via A5 bus:

l BOSTON EDISON CALCULATION SHEET \\ l Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa Hansen Sheet 18 of 58 Q4 Non Q MCC B15: 47 + j25 Steady state, 84+jl07 Starting MCC B17: 52 +j28 Steady state, 42+j55 Staning MCC B14: 99 + j54 Steady state, 37+jl7 Starting l MCC B18: 50 +j27 Steady state, 39+j51 Starting MCC B20: 19 +jl0 Steady state,16+j21 Starting j MCC BIO: 68 +j37 Steady state Prior to the energization of both buses, the LPCI loop selection will be completed in approximately 4 seconds after the break. The isolation valves M01001-28A/28B and MO202-5A/SB will receive closure signal. These valves are powered via MCC B20 and should be included as Starting loads at 12.5 seconds. The revised loading for MCC B20 is: 16 +j21 (from above) +213+j285 (M01001-28A/28B,PS65A page 98) ] + 74+j99 (MO202-5A/5B,PS65A page 98) l 303+j405 P215 A and P215B will also start at approximately 12.5 seconds. The starting load for each of these motors is 840 +j3910 KV(PS65 A). The DAPPER program was run with the above loading. The results are in Attachment SAK. From the results, all loads will start and accelerate with the exception of VEX 210A, M01001-28B and M0202-5A/5B. However, cables associated with VEX 210A were replaced via PDC 93-05. A voltage drop calculation was performed for the replacement cables using a Lotus Spreadsheet. Using the Lotus spreadsheet set up in calculation PSI 13, it was verified that VEX 210A will be able to start with 400v available voltage at MCC B15. See Attachment SAK-1 A. Also M01001-28B and M0202-5A/5B will not start within their manufacturer's limits. However after all other loads are successfully started, there will be an improvement in bus voltages. To verify that these valves will start after slight time 5 delays, we will model the two core spray pumps as running loads. For conservatism we will keep remaining starting loads unchanged. The results of the run (Attachment SAK-1B) indicate that these valves will start and accelerate properly.

BOSTON EDISON CALCULATION SHEET Calculation No. PS-161 Prepared by: Swapan Das J Rev. 0 Date 9/8/95 Checked by: Lisa Hansen Sheet 19 of 58 QV Non Q eNext loads (load block-2) that will be starting are: P203A: 840 + j3910(PS-65 A) P203B: 840 +j3910(PS-65 A) MCC B17: M01400-25A 74 + j99 (PS-65A) MCC B18: M01400-25B 74 +j99 (PS-65A) MCC B20: M01001-29A/29B 74 +j99 PS-65A) Steady state loading including loads that previously started is (valves loading neglected): MCC B17: 52+j28 (from previous run) MCC B15: 47+j25 (from previous run) =53.23 kva + 1.35 kva (B1546 steady state load of 1.5hp*0.9, previously started) +14.35 kva (B1516A steady state load of 16kw*0.9, previously started) +13.50 kva (B1526 steady state load of 15hp*0.9, presiously ) started) 82.50 kva = 73+j39 kva MCC B14: 99+j54 (from previous run) =112.77 kva + 1.35 kva (B1446 steady state load of 1.5hp*0.9, previously started) +18.00kva (B1416B steady state load of 20kw*0.9, previously started) { 132.12 kva= 117+j63 kva P215A: 604+j318 kva P21SB: 604+j318 kva MCC B18: 50 +j27 kvc 5 MCC B10: 68 +j37 kva MCC B20 19 +jl0 kva The program was run with the above input. The results are in Attachment SAL. results indicate that the motor operated valves, P203A and P203C will start with the exception of M01001-298. To verify that this valve will start,we will utilize the same method as used in the previous run. P203 A and P203B will be used as steady state loads. The results of the run (Attachment SAL-1 A) indicate that M01001-29B will start.

• Next loads that will start are P203C and P203D.

P203C and P203D: Starting loads 840 + j3910 KVA

BOSTON EDISON CALCULATION SHEET Calculation No. PS-161 Prepared by: Swapan Das Rev. 0 Date 9/8/95 Checked by: Lisa llansen Sheet 20 of 58 QV Non Q Steady State Loading: MCC B15: 73 +j39 MCC B17'52 +j28 P203A: 639+j309 P203B: 639+j309 P215A: 604+j318 P215B: 604+j318 MCC B14: 117+j63 MCC B18: 50+j27 MCC BIO: 68+j37 MCC B20: 19+jl0 Results of both runs indicate (Attachment S AM) that both pumps P203C and P203D will start. i eThe next pumps are P208 A and P208D (Salt Service Water pumps) which will start at 25 and 30 seconds respectively. Although these pumps will start at separate time intervals, for conservatism we will start them at the same time. P208A starting at B15: 192 +j599 KVA P208D starting at B14: 192 + j599 KVA The steady state loading: -MCC B15: 73 +j39 MCC B17: 52 + j28 MCC B14: 117+ j63 MCC B18: 50+j27 MCC B10: 68+j37 MCC B20: 19+jl0 P110A: 80 +j46 (this pump was started at 20 seconds and is now at steady state) P203A: 639+j309 P203C: 639+j309 P203B: 639+j309 P203D: 639+j309 P215A: 604+j318 P215B: 604+j318 The results indicate that both pumps P208A and P208D will start (Attachment SAN).

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das j Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 21 or58 Q4 Non Q e The last two pumps that will be sequenced on are P202A and P202D (RBCCW pumps) at BIS and B14. P202A and P202D: 135 + j353 each (PS65A, pg. 66) MCC B17: 52 +j28 MCC B18: 50 +j27 j MCC BIO: 68 +j37 MCC B20: 19 +jl0 MCC B15: 73 +j39 = 82.5 KVA l +81.72 KVA(P208A steady state load 90.8 x 0.9) l 164.22 KVA = 144.5 + j78 = 145 +j78 MCC B14: 117+j63 =132.88 KVA + 81.72 KVA(P208D steady state load 90.8 x 0.9) 214.60 KVA = 189 +jl02 P110A: 80+j46 l P203 A: 639+j309 P203C: 639+j309 P203B: 639+j309 P203D: 639+j309 P215A: 604+j318 P215B: 604+j318 The results indicate that P202A and P202D will start (Attachment SAO) This completes the start sequence. e Then the steady state loading was calculated for all loads automatically connected to both buses. Steady state loading is as follows from previous run: ) i MCC B17: 52 + j28 MCC B15: 145 +j78 = 164.22 KVA +50.94 KVA (P202A steady state load of 56.6hp x0.9) 215.16 KVA = 189 +jl02 MCC B14: 214.6 KVA +50.94 KVA (P202D steady state load of 56.6hp x 0.9) 5.54 KVA= 234+jl26 MCC B18: 50+j27 MCC B10: 68+j37 MCC B20: 19+jl0 P203A 639+j309

BOSTON EDISON CALCULATION SHEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa Hansen Sheet 22 of 58 QV Non Q P203B 639+j309 P203C 639+j309 P203D 639+j309 P215A 604+j318 P215B 604+j318 P110A 80+j45 G23 66+j35 (load started at 120 seconds and is now at steady state) The DAPPER run was performed and results are on Attachments SAP. A review of results indicate that all loads will run with adequate margin. The voltage at both buses will be above the bus undervoltage alarm set point. The above steady state loading only includes the automatic loads which are required to mitigate a LOCA. However other manually operated loads could be started by the control room operator. These loads are brought on later on in the scenario afler an ECCS pump has been manually tripped. In this calculation we will start two additional SSW ( P208B,P208E) pumps at the same time without tripping an ECCS load. Also during the start of these pumps we willload additional RBCCW pumps ( P202B, P202E ) as a steady state loads. The steady state loading which will be used are the same as beginning of this section except for BIS and B14 MCC B15: 307+jl66 KVA (includes P208B and P202B ) = 349.0 KVA 81.72 KVA ( P208B loading of 90.8

• 0.9) 267 = 236+jl27 KVA MCC B14: 350+jl89= 397.77 KVA (includes P208E and P202E )

j _ 81.72 KVA ( P208E loading of 90.8

• 0.9) 316.05 = 278+jl50 Also the starting load of P208B and P208E is 192+ j599 KVA each.

The DAPPER run was performed and the results are in Attachment SAQ. The results show that P208B and P208E will start properly. Also the steady state loading including P208B and P208E at steady state was run. The results in attachment SAR show that the available voltage is higher than the minimum required. e) LOCA w/ load Shed Study. "A5" Energized Swing bus connected-CASE F (Source voltage: 23.8 - 22.4 kv, Manomet transformer in, series capacitor out)

-~ BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa Ilansen Sheet 23 of 58 Q4 Non Q The calculation in section c) was performed with bus "A5" energized without the swing bus B6 connected. Although the swing bus B6 will not be connected to "A5" in this scenario by design a sensitivity study will be performed assuming swing bus B6 is connected to "AS". Since it is a sensitivity study, only the Manomet transformer in with the series capacitor out condition will be evaluated. This calculation will use the lowest source voltage values of 22.4kv (peak load conditions). The following is the tabulation of the individual MCC's and loads that are connected to the "A5" bus. The values were obtained from PS-65A, Page 35 and 36. This loading includes all automatic loads and manually operated loads that may be operating. MCC BIO: 135 +j73 KVA MCC B20: 19 +jl0 KVA MCC B15: 307 +jl66 KVA MCC B17: 52 +j28 KVA P110A: 80 +j46 KVA P203A: 639 +j309 P203C: 639 +j309 KVA P215A: 604 + j318 KVA G23: 66 + j35 KVA The above loading will be revised to reflect the scenario assumed in this calculation. In this scenario, a DBA LOCA was assumed with Emergency Diesel Generator "A" out of service. Swing bus B6 will be assumed to be lined up with the A Loop. Bus "A5" will be energized in approximately 12.5 sec. upon LOCA w/ loop by the Shutdown Transformer. All large ECCS pumps will be sequentially loadr.d in 5 second intervals (approximately). All non-essential loads will be tripped via the load shed logic. Pump P110A will not be energized until 20 seconds after voltage recovery. All 480V large motors (Salt Service Water and RBCCW) will ue loaded after time delays. Also various motor operated valves (short time loading, typically 30 sec) will be operating at different times during this scenario. MOV loads will be included as starting loads but will not be included in Steady State loading.

• Starting ofloads at various time intervals When power is available,(i.e. at approximately 12.5 seconds) the following loads (load block-1) will be at steady state or will be starting (from PS-65A, Pg. 88,89) via A5 bus:

MCC BIS: 47 +j25 Steady state MCC B17: 52 +j28 Steady state

-~ BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa llansen Sheet 24 of 58 Q4 Non Q hfCC BIO: 68 +j37 Steady state htCC B20: 19 +jl0 Steady state hiCC B17: 42 +j55 Starting hfCC B15: 84 +jl07 Starting MCC B20: 16 + j21 Starting i P215A will also start at approximately 12.5 seconds. The starting load for this motor is 840 +j3910 KVA(PS65A). Also M0202-5A/5B and M01001-28A/28B will be starting at the same time. These valves are powered via MCC B20 and the starting loads will be added to the above MCC B20 starting load. The revised MCC B20 starting load: 16 + j21 +74+j99 (M0202-5A/5B from PS65A page 98) 1 +213+285 (M01001-28A/288 from PS65A page 98)' 303+j405 KVA The DAPPER program was run with the above loading. The results are in Attachment SAAA. A review of the results indicate that all loads will start and accelerate properly. e Next loads (load block-2) that will be starting are: P203A: 840 + j3910 (PS65A) MCC B17: M01400-25A 74 + j99 (PS65A) MCC B20: M01001-29A/29B 74 +j99 (PS65A) Steady state loading including loads that previously started is (valve loading neglected): MCC B17: 52+j28 (from previous run) MCC B15: 47+j25 (from previous run) =53.23 kva +1.35 kva (B1546 steady state load of 1.5hp*0.9, previously s started) +14.35 kva (B1516A steady state load of 16kw*0.9, previously started) +13.50 kva (B1526 steady state load of 15hp*0.9, previously started) 82.50 kva = 73+j39 kva P215A: 604+j318 kva MCC BIO: 68+j37 kva MCC B20 19+jl0 kva

i 1 BOSTON EDISON CALCULATION SIIEET { l Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 25 of 58 Q4 Non Q The program was run with the above input. The results are in Attachment SAAB. Results indicate that both motor operated valves and P203A will start. ) eNext load that will start is P203C. P203C: Starting load: 840 +j3910 KVA l Steady State Loading. l MCC B15: 73 +j39 MCC B17 52 +j28 [ P203A: 639+j309 P215A 604+j318 Results of the run indicate (Attachment S AAC) that P203C will start. 1

• The next pump is P208 A, salt service water pump which will start at 25 seconds.

P208A starting at B15; 192 +j599 KVA The steady state loading: MCC B15: 73 +j39 MCC B17: 52 +j28 P110A: 80 + j46 (this pump was started at 20 seconds and is now at steady state) P203A: 639+j309 P203C 639+j309 P215A 604+j318 The results of the run indicate that P208A will start (Attachment SAAD) e The last pump that will be sequenced on is P202A, RBCCW pump. s P202A: 135 +j353 on B15 (PS65A, pg. 66) MCC B17: 52 + j28 MCC B15: 73 +j39 = 82.5 KVA +81.72 KV6(P208A steady state load 90.8 x 0.9) 164.22 kVA = 144.5 + j78 = 145 + j78 P110A: 80+j46 P203 A: 639+j309 P203C: 639+j309 P215A: 604+j318

~.-..--.-. - - --- BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 26 of 58 Q4 Non Q The result of the mn indicate that P202A will start (Attachment S AAE) This completes the start sequence. eThen the steady state loading was calculat:d for allloads automatically connected to this bus. Steady state loading is as follows from the previous run: MCC B17: 52 + j28 MCC B15: 145 +j78 = 164.22 KVA 50.94 KVA (P202A load) 215.16 KVA = 189 +jl02 3 MCC B10: 68 +j37 MCC B20: 19 + jl0 P110A: 80 + j46 P203A: 639 +j309 P203B: 639 + j309 P215A: 604 +j318 G23: 66 + j35 (load was started at 120 seconds and is now at steady state) The DAPPER runs were performed and results are in Attachments AAAA. A review of the results indicate that all loads will run with adequate margin. The voltage at A5 will be slightly above the bus undervoltage alarm set point. The above steady state loading only includes the automatic loads which are required to mitigate a LOCA. However other manually operated loads could be started by the control room operator. These loads are brought on later on in the scenario atler an ECCS pump has been manually tripped. In this calculation we will start an additional SSW (P208B) pump without tripping an ECCS load. Also during the start of this pump we will load an additional RBCCW pump (P2028) as a steady state load. The steady state loading as follows are from the beginning of section e: MCC B17: 52+j28 KVA MCC BIO: 135+j73 KVA MCC B20: 19+jl0 KVA Pl10A: 80+j46 KVA P203A 639+j309 KVA P203C 639+j309 KVA P21SA 604+j318 KVA

BOSTON EDISON CALCULATION SIIEET Calculation No. PS.161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 27 of 58 QV Non Q MCC B15: 307+jl66 KVA (includes P208B and P2028) = 349.0 KVA 81.72 KVA (P208B loading of 90.8

• 0.9) 236+ jl27 KVA G23 66+j35 KVA Also the starting load of P208B is 192+ j599 KVA The DAPPER run was performed and the results are in Attachment AAAB The results show that P208B will start properly. Also the steady state loading including P208B at steady state was run. The results in attachment AAAC show that the available voltage is higher than the minimum required.

I I I l

1. I'U" "U'

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2.3 kV oF FstT 6 S o u s2.c 5 loa o Flood ST u pY 4A G L E i, PAA 6_i_ doestur IctP NSR MZ4: BlD LbAy dQOtP46W Rsquig69 Md4 v o t.fA(qE (V) g*p eIn toms ems seen START CurJ F_>fol3 V 6.) 414 9 M4 B>toly U47 376 7 416 9 MR f 4 M. 5 N4 Stol5 c l9 4(44 M4 B lo23 A l6L 61o23S P144 4222 433 0 W 420 5 u d. 810148 y los B t02F p l 3 2. 382.z6 4 IF.62 /JA B 1026 K 101 397 10 42'274 BloE ! VAC104 A 403,f 428.l M a. B 103 3A V Cc t otA 421.3 MA Blo34 V R. F l ol A 4 1 2. 9 429.I MR B>to4 i Pl3l 3 83.3 4!9.E tJR Bto4 2 P I'2.9 394 9 42.3 NR Rio44 Xtol 3819 419.l MQ Bt064 K.io4c. 3 97.3 425.I M6L s 007 A) M AMO MCg (cay 6 FOR M ER f u, S E ele 9 GAfAcl[OC dA6E uietuou AV AI L A 6LG M 44. f309 VO L(AqE "EM 64EAdy G TATE : 16 0 V b ^[9 d 40R MAEM M(1 139 v ( A 77 Ac y SA E rdT'N', P63. I 9) D b AG E B) H A tJ o u ET f st. Aus FoEM E P 00f, GEtt E s CA PAGl[o g. f>J M t >J iu o u AY AIL AV:,L E Mc.C 604 VoL(A6lE_ G(E A >Y 64A(E.' 43 3 ( A4c'd A A ' PPh 2 4" LlofoL fi'ARitJq'. 4 30V (ANM M AN'f*' 8 g ._ _.,a

CALCULATION SHEET 3%7,og yo._ C PRELIMINARY PREPARED BY_ DATE REV DATE CHECKED BY__ DATE- @ FINAL P5-l6f,Rgv.O BON APPvo or oA1E REV DATE EDISON sneE1 a o, 2 )

SUBJECT:

23EO o F PGITS Soo r2 c.G L o A-b PLotd 6TUDT SR U IA Ga L.E i, FAA 6 f._ foRBluE (CIP NSR [ Mu: sis LbAP 64 O LP46fd REat.Ui#69 W L vo L(A4 E (V) 4 /"R eo ss eM9 1 {,p seen GTART 5?u rd B1513 pil 4(74 926 7 4 t.oaA na rewir<a eer rsett,W B 15'l6 A VG T'F 201 A Not eq=l. Ate couJiMeat-g workiai G, Gl5l6 S V6R Flot A 6152./ .VEy lo4 A 3'81 4 418e-l UR g~ R 1625 Klo4 A 4o61 428 3 MR B1526 VEy 2to A 4lh8 43o.2 q t.a. n o t r etu r ed re, Fs4 g/( SIS 3I P2o2A 3 7.?,4 4 ( 6 5~ B154I P208A 389.2 419,8 d2~~ Bt644 P2ces 339,2 4 98 .q Sl563 VGyto3A 376 1 4 i S.7 tJ d t O U 'T l A) M ANO MEf (cay 6 FO ? M FR f u, S G EiE9 <^ fact (OC G dA6E M itJI M O V AV Al t A 6L-G M66 606 VO L[AqE l fe Ady G TATE : 15 or( A T7 A CH M E 4 TB, f'A 4 6 14) 7 i P 1h U 40f2 9(AEfttJ@! Solv (W A C. 4 M E PJ T h.) 0 O [ At;G. 6) y A tJou gT -[g Aus Foc M Ef2 00f, 6EEtES CAPAGl[0 R. f>J Av AlL A%L { Mcc gg4 VOL.[Ag p, g M Niu tnA 4(E A PY GOfE l 4 21V (AALkM AA. P 14)s y tl2V[. Fi&f j g.i ) P2 U of'o E. 6(AR1'taq.396V ( A-bc.k -4 A C ~_

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INION N PRELIMINARY PREPARED BY_ DATE REV _ DATR FINAL PS t61 'REV.O CHECKED BY DATE BOSTON APPYo eY oA1E REV DATE EDISON ssEer g a_Og a

SUBJECT:

23 kV oFPst rE sooCc E Lo A o GLoA) STUDY SR 4A 6 L 6 3 PAGA7 LOCA PJIT4 A E A u t> A (, NSR ] LbA F dQ OlP4 Gd N5401469 Md6 AVAIL A BLE MAILABLE f,p V oLTA6 E (V) Vo w., Vo t r. 1 MW Dd 94AEf 5?u rd i A So3 92.o3A 3 3 2.g s dyy a sysH4;ld.5A) His I ( Anck. S Am.) A sr6 P 2_o S c. S3 2s 37 tty c2 39#4AlkMAuj 4 So tA Hear 549_) A 50 7 P 2. i S A 352s 3? tt4 tP 3s t4(Ansex) 413c LAHeA> s AA.) A.603 P2o36 $328 37 % 4 34filAu s4L) "4lA6C AHck' S42.) ^6o6 P2. esp 3323 37 % Q 3904(A439#) mi o ( AlfeA SML) A 6e7 P2.15 $ g 32.8 374Q Q 341f(ALA,sjx) 4,25(Agek.cA.g,) Blos Pilo A 3 Q,, 4 14 MQ 9 7K ( A 4ck.S A p.) ~~ 86o6 4 2.?> 368 4H MR 4-1 (Akk. FAc) i l i Tne r e pi r e.d s b 4is$ arcl e e niwg volkge3. wmJ 4o be S o#/o W g o /, e s pe cA've g o -.. ~.. -

h-osvc D O enetiuiN^ny eneg nco ov_ nev oare CHcCKED BY DATE ' - [ FINAL P 5 - l 61, R G tt. O , BOSTON nev onc_ .ngvo or o 1c ' ED/ SON succ1 g o g g

SUBJECT:

2 3 KV o F F S trc. socc c C loa D PtoW ST o DY' h SR TA G> t E 4 17 c-E;L A NSR ] LOCA MITM AE B06 Ap p SQiN% Bec B6 Ltcc.. GIo loa F dQ OlPt46LK NE4.uir26P Mll. AWIL A 6LE AV A IL A S t-C V0'IA6E(V) t/o gy,, yo ty. 1 {,p MMI Dd 94 AP_ T f! u d (A1 tac W M ENTAAd I 99 WA v/4 463 ts i o t 3 x-F9 Ab3 A I A 'S !J4 rJ I A-A63 \\ 6 to IG Y-l9 Slo 234 ICL A I A 3_ IJ R ___ y I A-6toz36 P-14 6 921'l 413>S IJk 463 B io 24 S x - los 420< 4 MQ d/A 963 f ~ 463 e, I6 2(, W: - lo l 397,1 9 t 2,7 M4 443 E> lo41 P-G l _ _3J.3.3 919 4 PM 2 ... mmeses. ,,a m *= -* em es. 8' a w 6e w4M use 9-* O-- --p

p. e.

_.p t

bI Au567uzATior O PRELIMINARY PREPARED BY_ DATE REV__ _DATE E CHECKED OY_ DAVE @ FINAL PS-161,I2.V O [ EDISON BOSTON Aggvo 0, oA1E REV _ DATE ssEE1 gor _gis

SUBJECT:

2 3 KV O F F 61T E sooR C. E Lo A D PL_o v0 STU DY SR 0 dh G> L E 4 PAC,.G Q LoCA kJ I T 4 A E B US NSR ] AMP 6ko t 9q B o 6 B4 M cc: E20 LbA P dQOtPL46HI IsEdlLulf26p F44L A\\//,lL A B LE AV A lt-A 61 E V0'(A4E(V) t/ety,, V o L-r. 1 {p MW W GTAPf f7orJ [A lbck M A A Ad E. 20 n h Y-Ao _9 sS 4 _f_(L-Mil A'5 F,2o14 X - 5'O 4 15' 6 p a_ rJ / A 463 C2.024 uotool-29 A 3S 7. I R 42f(ANcL 54 A 8) 463 ~ 4 4tf(A#d4 AAB) 463 62026 u o tooi-M S 9 14 5-F 2.o 31 No roon29 A 379 3 R 4evAu sA44) 463 6 2A4 mo toor-29 G AoA.3 R Aob(AM *A Ap) Ab3 ~ f,ZosN uo::2ot.2 3706 4 404(Akk s4AA) 4 63 8 2 oSL u o i2or-s o 373 4 4 4o6MM5A4A) 463 , p 2.og 3 so 2o2.-9 A 4 o s 7, 4 MoMAESAGA) $63 r, to't L uo222-S& A v3.] R 40b(p%SAA9) 4 63 Me-es_ P ..i d' g

CALCULATION SHEET -XQygg3rioa no g ~ PRELIMINARY PREPARED BY DAVE _ 1 REV DATE CHECKED BY DAVE _ ~ @ FINAL P 5-161. RE U.o BOSTON .ggvo oY o 1E_ R E V___.. D AT E ___ _. __ _. EDISON gueE,p_orm s

SUBJECT:

'23tv oppgi7g gog gz c g ta g n g,,gg sygny SR 0

dA Cb L E A PAGq_ LOCA bJ f f M AE Bos NSR [ 1 AND SdlNh Eu6 M 14 CC ; B is L oA P dQ O1Pt4 fM RsAusgdp M(L As/xit A gLE AV A IL A SLE V 0'IA4 E (V) t/o ts. Vo L.T. 1 .f. p $ldQ MM Dd SV R.9 eda P.f f!u rJ ( A TrecH.4AAd ~ 74 _a o /A 4 so B1513 D it G IS 16 A v ciTF 2oI A J/A d eJ / 4 4 60 0/A R >3/A 4 60 B l 616B VCEFiorA B(526 VEyatoA .11L. ? 430,1 R fl2(Md 5443) 4 g, _ _ B 153 I r 2. 01A 3%.4 415 5' G 12i[A lid. 54A E) 4 60 iGis33_ ezozs _3.15,j 4i6.s a m(4ua. 44 As) 4 go e, t S9 ( Plo8A $_9% 2 4 n.9 Q (q(AQ gagp) A fo 281544 P to? B .J_9 3.'1_ 43,,3 Q' 3ts (4g.444g] 4 50 BISAL PMl A _...k? 2A. _A%'\\ >JQ A&WAAA: A 50 45D 8t663 vex to3 A 396.1 4197 UA _ SIS 64,go3 goo 361,2 _ __- Q 411(4%. sA AA) 4 6D Q 4;2(Alkk.5AA4) d 50 Bl646 Mo3ROL 363 1 4 b66E toA05 ACE eJo T C.E g o I E E_ P ft)R LeM. Mg OME pou{ (ER Loof IG CE Rui EE P, loa DiMq#)G s W GC E dot I"ctUDED F T"'9 C 4 '6 " ' A T torJ, Lo A Di A E.E OfEfz^TioJ GEE F S A GE lo. 5 5 3 A rJ P l o. 7. 5. / *M M A 40 A L r swA:q vounc h s i s p., bed o-sb+9 o P he e g e,o oxp p s tsw su)h>d w

-~~ l PRELIMINARY PREPARED BY_. DATE j REV DATE CHECKED DY_ DAVE N FINAL PS-16l, REV.O BOSTON Aggvo or-om% j REV DATE-EDISON ,Heern_oP.a a j s

SUBJECT:

2 3 kV OFF5fTE, sauecE Lo40 p t.o tJ 6T O D Y d4 G> L G 4 VAGGQ NSR ] Lo c, A WIT 4 AE Bus l ANp S M 'l Bu6 B6 1 I M cc' 617 LbA p 6QutPL46d fss R u t # d P W L As/4IL A gLE AV A lt. A S t-E } V 0 '<A4 E (V') t/o g., Vo L. r. 1 {,p MN Dd 4-(AR f CurJ GAT TAuf MOJTAge)_ ' 379_ gid 0/A 4 64 __ l Es t 713

c. i o 2, A 817 f 4 V I,P zo s A 372 S 415,i L

>417. # 464 G17D v A c 2o2A 394,*6 91% 6 q 7 4t7 3 464 GL725 v' A C2 o4 B SCL7 40)6 Q >4t74 464 i Q 4(7(Ata.s d 464 81741 M o i4oo-3A 3 73 I B1763 Mo foo t -t4 A W.> O di?Q 4sAAA) 4 A4 j ~ 0 417(AM 5AA A) 4 64 B1736 404094 _3_713 Q 4t1(.Ap s A44) 464 Bt726 M o4 o6 r 371,3 Bt7H y14 init3 Q 4/k 4 64 ~ __31 64 y oA 44 ~ Bt7116 yss B t746 u olyco-a rA..do2.f.7._ q 4tsGman] 464 l ( tKcs e l on J c ane 56 raccl pc 'o n to 4' Based on L6ad BIx1 - d (. AHArk md SAA A ) ~

• 50 O'

4 -) Q j e ed ku. - VoI4% C t l f

I N^*'"" ~ ~ O PRCllMINARY PREPArtCD BY _ DATE. REV_ _DATE _ - o^To _ coccxeo ov _ _. _ @ FINAL Ps - t61 12cv o

1. BOSTON

.,,gvo ov._ _ 041c _ MEDISON nev o^Tc s,,cc1g_oc.s. SUOJECT: 7.3 xV oF F GtTE sooCCE loa P FLov3 GTODY f bb TA 61. E9 ___ PAGf f. 4 NSR ] LCCA MIT4 AS Bus AtJ P 6dlM1 Bo6 B6 L b A T7 t$Q O \\Phl!MI IsCAut(26(7 Ml6 AVAIL A BLE ^ # A U ^ G '- E V0'IA#E(v) t/o g, yo u.r. 1 {.p MM Dd 94ACT (!urJ AGO3 P 103 A J3T5~I N44 # R JTof(AluS448) 1 3ClGO(AM. A Anc) Aso6 e v_o 3 c s3284 g79tj V _4 arg (4g,93,,) 33 6c(Al4d. A g4q A 507 P 116 A 3 281 77,ygf g lus/Aigg.(444),_ _g 9 6 o [4 % A p oc.) j E> t o G _ P 1to A __363_ l 4 14 ( 0A j 4 56 L4}Ick AA Ac) 4 s i(A Hch 444c) o s6o6 623 3QJ 4 14

• dQ

.M .a I 90% 900 & Assousp g o */o 6TA T AMD f

CALCULATION SHEET f^?%7,og no. O PRELIMINARY REV DATE PREPARED BY IOM DATE 9/23/9f" @ FINAL PS-16i, Reg /.o CHECKED BY DATE APPVD BY DATE EDISON ssEEracPm

SUBJECT:

2 3kV o FF 5tTE S ou cc.g. t.oAp p t.o u) 6 To b y Y Asso}soo p g g, f_. \\ To c s W E T re-I P kAb t rJ SR VoL5 A q r 2 t. 3 - 2 t.4 g/ M s /' O b d 13 5 h o e d Y j 6 /' 1 N 12so/g, / 4 f9 / I / / /u a i *%o / / / w / / / 4 4 50 n.- - A 6/A ( AL A cid E.1 5 E T Pold7 l FCO M b't1ACH 'A b' 3 g, 3 m a-l ^5/M A L A t.M powr \\ f " f'i 3 0 \\ \\ \\ / \\ 3750/+20 22. 12.4 ,jg gt; i <2 g,3 2 3 KV VotTAtE(W) t 2i

DON RO. C PRELIMINARY l REV DATE PREPARED BY DATE l, @ FINAL P5 -l6 (, R E V. O CHECKED BY DATE REV DATE BOSTON AggvD oy DA1E EDISON ssEermO,m l

SUBJECT:

G 3 xV o F FSIT E 6c o f> c4 VOLTA 4E Lo A D F Lod G(O P Y P IG 1 h SR ] Lo f. A loa DIM NSR [ l 1 ? 2H N .1 % Al50 a 'N zo A6/A 6 AL A R.M R ESET PolN T M 86 4 l

• A 50 l

AT7Ac.nueNg 'A A A ' l 'A A B' I suo / l l l 375o I 21 3 22. IL4 23 2.3 kN VOL,TA6 E ( KV ) m

BOSTON EDISON CALCULATION SHEET i Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa Hansen i Sheet 28"of 58 Q~4 Non Q SI 6. References

a. Calculation PS64, Rev. O i

b. Calculation PS65, Rev. O

c. Calculation PS65A, Rev. O

d. Drawing El Sh.1, Rev. EIS

e. Drawing E8, Rev. E16 l

f. Drawing E9, Rev. E39

g. Drawing E10, Rev. E29 l

h. National Electric Code - 1987 l

i. PNPS procedure 2.4.144

j. Calculation PSI 13, Rev.0

k. Drawing SE155 Sh.2, Rev.E44 j

1.GE LOCA Analysis, NEDC-31852P

m. FSAR sections 10.5 and 10.7 i

7. Attachments Attachment A - BECo. Memorandum from Mr. J. F. Gurkin to Mr. J. Pawlak, dated September 16,1988. Attachment B " Turbine Trip steady state load 23 kv sot.rce voltage 22.4" Attachment C - DAPPER run " Turbine Trip Motor Start at BIS - 23 kv source voltage 22.4" Attachment D - DAPPER run " Turbine Trip Motor Start at B14 - 23 kv source voltage 22.4" Attachment E - DAPPER run " Turbine Trip Motor Start at B17-23 kv source voltage 22.4" Attachment F - DAPPER run " Turbine Trip Motor Start at B18 - 23 kv source voltage 22.4" Attachment G " Turbine Trip Motor Start at B20- 23 kv source voltage 22.4" Attachment H " Turbine Trip Motor Start at B10 - 23 kv source voltage 22.4" Attachment AA - Turbine Trip Steady State Load - 23 kv source voltage 21.3" Attachment AB " Turbine Trip Steady State Load - 23 kv source voltage 24.0"

BOSTON EDISON CALCULATION SIIEET Calculation No. PS-161 Prepared by: Swapan Das Rev. O Date 9/8/95 Checked by: Lisa IIansen Sheet 29 of 58 Q4 Non Q Lt Attachment AC " Turbine Trip Motor Start At B15 - 23 kv source voltage 22.2" Attachment AD " Turbine Trip Motor Start at B14 - 23 kv source voltage 22.2" Attachment AE " Turbine Trip Motor Stan At B17-23 kv source voltage 22.2" Attachment AF " Turbine Trip Motor Start At B18 - 23 kv source voltage 22.2" Attachment AG " Turbine Trip Motor Start at B20-23 kv source voltage 22.2" Attachment AH " Turbine Trip Motor Start At B10- 23 kv source voltage 22.2" Attachment AAA "LOCA wAcad shed with A5 Bus Steady State - 23 kv source 4 voltage 22.4" Attachment AAB "LOCA w/ load shed with A5 Bus Steady State - 23 kv source voltage 21.3" Attachment AAC " Lotus spread sheet showing VEX 210A acceptable at 391V" Attachment AAD "LOCA wMoad shed with A5 Bus SS w/ MAN Loading-23kv source voltage 22.4" Attachment AAE "LOCA wAcad shed with AS Bus P208B staning -23kv source voltage 22.4" Attachment SAA "LOCA wAcad shed with A5 Bus Load block-1 starting source voltage 22.4" Attachment S AB "LOCA wMoad shed with A5 Bus Load block I starting source voltage 21.3" Attachment SAC "LOCA wMoad shed with A5 Bus Load block-2 starting source voltage 22.4" 1 I Attachment SAD "LOCA w/ load shed with A5 Bus Load block-2 starting source voltage 21.3" Attachment SAE "LOCA wMoad shed with A5 Bus P203C starting source voltage 21.3" l 1 l

l BOSTON EDISON CALCULATION SIIEET 1 Calculation No. PS-161 Prepared by: Swapan Das l Rev. 0 Date 9/8/95 Checked by: Lisa Hansen Sheet Kof 58 QV Non Q SAttachment S AF "LOCA w/ load shed with A5 bus P203C starting source voltage 22.4" Attachment SAG "LOCA w/ load shed with AS Bus P208A starting source voltage 22.4" l Attachment SAH "LOCA w/ load shed with AS Bus P208A starting source I voltage 21.3" i l j Attachment SAI "LOCA w/ load shed with AS Bus P202A starting source voltage 21.3" i Attachment SAJ "LOCA w/ load shed with A5 Bus. P202A starting source voltage, 22.4" Attachment SAK "LOCA w/ load shed with Load block-1 starting source voltage. 23.8." Attachment SAK-1 A " Lotus spread sheet showing VEX 210A acceptable at 400V" Attachment SAK-1B "LOCA w/ load shed with M01001-28A/28B starting source voltage 23.8." Attachment SAL "LOCA w/ load shed with Load block-2 starting source voltage 23.8." Attachment SAL-1 A "LOCA w/ load shed with M01001-29B starting source voltage 23.8. Attachment SAM "LOCA w/ load shed with load P203C,P203D starting source voltage 23.8" Attachment SAN "LOCA w/ load shed with P208A,P208D starting source voltage 23.8" Attachment SAO "LOCA w/ load shed wi.h load P202A,P202D starting source voltage 23.8" Attachment SAP "LOCA w/ load shed with both bus steady state source voltage 23.8"

BOSTON EDISON CALCULATION SHEET Calculation No. PS-161 Prepared by: Swapan Das Rev. 0 Date 9/8/95 Checked by: Lisa llansen Sheetprof 58 Q4 Non Q SV Attachment SAQ "LOCA w/ load shed with P208B,P208E starting source voltage 23.8" Attachment SAR "LOCA w/ load shed with both bus steady state source voltage 23.8" Attachment AAAA "LOCA w/ load shed with A5 bus steady state source voltage 22.4" 4 Attachment AAAB "LOCA w/ load shed with A5 bus P208B starting source voltage 22.4" 1 Attachment AAAC "LOCA w/ load shed with AS bus ss w/ man load source voltage 22.4" Attachment SAAA "LOCA w/ load shed with AS bus load block-1 starting source voltage 22.4" Attachment SAAB "LOCA w/ load shed with A5 bus load block-2 starting source voltage 22.4" Attachment SAAC "LOCA w/ load shed with A5 bus load P203C starting source voltage 22.4. Attachment SAAD "LOCA w/ load shed with A5 bus load P208A starting source voltage 22.4" Attr.chment SAAE "LOCA w/ load shed with A5 bus load P202A starting source voltage 22.4" i

EXHIBIT 4 Sheet 1 of 2 RType A9.02 PRELIMINARY EVALUATION CHECKLIST 1. IDENTIFICATION: Document Number PS-t 6 i Revision o Description 7 3 K._\\/ o F F 5 i T E. S e o e c.E toad P t.o td STo PV. 2. CLASSIFICATION: @ Yes O No

a. Does the proposed change involve Q listed equipment?

O Yes @ No

b. For a new procedure, Temporary Procedure, or major revision; does the Procedure contain procedural steps or requirements in the FSAR?

If yes, identify FSAR sections. O Yes @ No

c. Is this a new procedure or Temporary Procedure that is Fire Protection Program related or a major revision that makes an existing procedure Fire Protection Program related?

3. PRELIMINARY EVALUATION: 0 Yes @ No

a. Would this modify plant characteristics or procedural steps described in the FSAR?

If yes, identify section: O ves 8 No

b. Does this affect the design of systems, structures, or components described in the FSAR7 0 Yes a No

c. Does this affect the function of systems, structures, or wmponents described in FSAR7 0 Yes

@ No

d. Does this affect the method of performing the function of systems, structures, or components described in FSAR?

O Yes @ No

e. Does this indirectly affect the capability of safety related systems, structures, or components described in the FSAR to perform their functions?

O ves 3 No

f. Does this create a new test not described in the FSAR that could affect plant safety?

N0P83E5 Rev. 7 Page 29 of 36 I

EXHIBIT 4 Sheet 2 of 2 PREllMINARY EVALUATION CHECKLIST (Continued) O Yes @ No

g. Would this change assumptions used in the accident analyses described in FSAR Chapter 147 If yes, identify sections:

O Yes @ No

h. Does this change affect the ability of a system required to achieve and maintain safe shutdown in the event of a fire?

O Yes 3 No

1. Does this change affect a requirement of, or major commitment to, 10CFR50 Appendix R7 0 Yes

@ No

j. Does this change affect a requirement of IE Circular 80-18 (for Radioactive Waste Systems)?

O Yes N No

k. Could this affect the function of systems or components required for compliance with the Limiting Conditions for Operation in the Technical Specifications?

O Yes @ No

1. In the judgment of the evaluator, is a Safety Evaluation required?

If the answer to any question in Part 3 is "Yes", then a Safety Evaluation is required prior to implementation. Check the appropriate block and provide any explanatory comments below: 4. SAFETY EVALUATION REQUIRED? O Yes @ No 5. PREPARED BY:- Me / 84-[MMe</[59 Date 8/7/7( e- ~ / Title APPROVED BY: l3 % / N.' m [D w Datek7fT N Title i N0P83E5 Rev. 7 Page 30 of 36

TMN I Calculation - Independent Verification Statement Record P, $ of $ 51 Calculation # PS161, Revision # 0 has been independently verified by the following method (s), as noted below: Mark each item yes, no or not applicable (N/A) and initial each item checked by you. Design Review @ including verification that: M.if S Design inputs were correctly selected and included in the calu e $5 Assumptions are adequately described and are reasonable. . MIA Input or assumptions requiring confirmation are identified, and if any exist, the calculation has been identified as " Preliminary" and a " Finalization Due Date" has been specified. h QS Design requirements from applicable codes, standards and regulatory documents are identified and reflected in the design. ep Applicable construction and operating experience was considered in the design. The calculation number has been properly obtained and entered. An appropriate design method or computer code was used. [ A mathematical check has been performed. $ The output is reasonable compared to the input. W u.s4 rwa.I ou.s Altemate Calculation O including verification of asterisked items noted above. The attemate calculation ( pages) is attached. G4 Qualification Testing O for design feature including verification of asterisked items noted above and the following: d[k The test was performed in accordance with written test procedures. Most adverse design conditions were used in the test. Scaling laws were established and verified and error analyses were performed, if applicable. Test acceptance criteria were clearly related to the design calculation. a Test results (documented in ) were reviewed by the calculation Preparer or other cognizant engineer, independent Reviewer Comments: 6tf P.f IS/ k.0. da A U) 9/gl95 Independ'ent Reviewer /Date

1. R/9;'

Preparer concurrence with /S/ findings and comment resolution Prepa(6r or Other Cognizant Engineer Note: Exhibit 3.06-B (Sheet 3 of 3) may to used for additional comments by IV as a part of the independent Verification for calculations. Docurnent4 NESO 3.06 Rev. 7 Page 1 of 1

f.$h Ch Calculation Independent Verification Statement Record (Cont'd) - Calc. PS161 Rev. 0 All previous comments have been resolved and the calculation text has been revised accordingly. Errors found in the input data were corrected and new DAPPER runs were performed. In some instances the values shown in Tables 1,2 and 3 did not match the output of the DAPPER runs. These tables have been revised to accurately reflect the results of the DAPPER mns. Figure 1 is for the Turbine Trip case only, Figure 2 needed to be created to reflect the LOCA with load shed case. There are differences in the appearance of the DAPPER printouts between this calculation and PS65A. These differences do not impact the results of the calculation, they are only differences in appearance. The DAPPER outputs contain several" Isolated Busses". These isolated busses are created when the feeder cable to the bus /MCC is taken out of service (to model the scenarios in this calculation) but the feeder from the MCC to the load is left in service. In order to prevent these loads from showing up as " isolated busses", the feeder from the MCC to the load should also be taken out of service. However, this would be time-consuming and would not change the results of the calculation, only the appearance of the calculation.}}