ML13268A005
| ML13268A005 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/24/2013 |
| From: | Lopez B, Schrader K, Sharp M Pacific Gas & Electric Co |
| To: | Office of Nuclear Reactor Regulation |
| Rankin J | |
| References | |
| TAC MF2630, TAC MF2631 | |
| Download: ML13268A005 (49) | |
Text
DIABLO CANYON POWER PLANT Pre-application pp Meeting, g, Diesel Generator License Amendment Request September 24, 2013 Ken Schrader Regulatory Services Pacific Gas & Electric Co.
A il B Avila Beach, h CA kjse@pge.com 805-545-4328 Mark Sharp Engineering Manager, Licensing Basis Verification Project Pacific Gas & Electric Co.
Avila Beach, CA masl@pge.com 805-305-9366 B
Brandyd Lopez L
Engineer, Licensing Basis Verification Project Pacific Gas & Electric Co.
Avila Beach, CA bnsm@pge.com 805 787 0318 805-787-0318 1
Agenda Diablo Canyon Power Plant (DCPP)
Diesel Generator (DG) Licensing Basis Changes g to License Amendment Request q ((LAR))
Scope since January 15, 2013 meeting Issues to be Resolved byy LAR Scope of Tech Spec (TS) Changes Specificc TS Spec S Changes C a ges DG Load Margin Program Staff Feedback 2
DCPP DG Licensing Basis Safety Guide 9 (SG 9), dated March 10, 1971 Provides basis for DG design DG Ratings:
2600 kW, Continuous (8000 hours0.0926 days <br />2.222 hours <br />0.0132 weeks <br />0.00304 months <br /> per year) 2750 kW, 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> per year 2860 kW, 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 3056 kW, 30 minutes per year Generator full load rating at 80% PF = 3250 kVA Approved exception to SG 9, Regulatory Position C.4 for AFW p pump p frequency q y recovery y time 3
DCPP DG Licensing Basis Regulatory Guide (RG) 1.108, Revision 1 Provides basis for DG testing Approved exceptions to RG 1.108, Rev 1:
Regulatory Position 2.a for DG surveillance frequency Regulatory Position 2.a.(5) for modified DG hot start Regulatory Positions 2.a.(9), 2.d, 2.e, and 3 for DG test validation Regulatory Positions 2.a.(3) and 2.c.(2) for verification that DG cooling system functions within design limits 4
DCPP DG Licensing Basis RG 1.137, Revision 1 Endorses ANSI N195-1976 which provides basis for fuel oil and lube oil volume requirements 5
Changes to LAR Scope Incorporated ambient air temperature derate in accordance with manufacturers recommendations.
Included reduction in low end of frequency band.
Proposed steady state frequency band is 60 +/-
0 8 Hz 0.8 Hz. (Typical DG performance is +/- 0.25 0 25 Hz)
Included reduction in voltage band. Proposed steady state voltage band is 4160 +/- 180 V V.
Correct TS SR 3.8.1.9 to restore compliance with RG 1.108 1 108 Rev Rev. 1 Position 2 2.a.(4).
a (4) 6
Typical DG Voltage and Frequency Loading Response Plots 7
8 9
10 Issues to be Resolved by LAR Submittal of amendment request addresses NRC Administrative Letter 98-10 guidance to submit an amendment request to correct non-conservative TS values in a timely fashion.
11
Issues to be Resolved by LAR DG maximum steady state loading exceeds 2000-hour DG rating (2750 kW) at current Surveillance Requirement (SR) maximum frequency and voltage values Current SR maximum frequency value = 61.2 Hz, voltage l value l = 4400 V Current administratively controlled maximum frequency value = 60.5 Hz (including 0.25 Hz instrument unc.)
DG loading analyses maximum 60.8 Hz/4340 V maintains load < 2750 kW 12
Issues to be Resolved by LAR Current SR load values based on Standard TS (STS) that are based on RG 1.9, Rev 3 as opposed to RG 1.108, Rev 1 RG 1.9, Rev 3 assumes maximum loading below continuous DG rating RG 1.108, Rev 1 requires demonstration of full-load-carrying capability (continuous DG rating)
DG ma maximum im m loading at 6060.88HHz/4340
/4340 V (2663 kW) exceeds continuous DG rating (2600 kW) 13
Issues to be Resolved by LAR Current SR Power Factor (PF) values do not bound DG loading analysis calculated values Current SR minimum PF value = 0.87 DG loading analysis minimum PF value = 84.6%
14
Issues to be Resolved by LAR Current SR day tank volume based on continuous rating versus maximum loading RG 1.137,, Rev 1 endorses ANSI N195-1976,,
which requires each day tank to contain fuel oil for at least 60 minutes of DG operation assuming fuel oil cons consumption mption with ith the DG rrunning nning at 100%
continuous rated load plus 10% additional margin Required fuel oil for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> of DG operation at maximum loading (2663 kW) is greater than current SR minimum day tank volume (250 gal) 15
Issues to be Resolved by LAR Current SR full load rejection test value does not meet RG 1.108, Rev 1 requirements RG 1.108,, Rev 1 requires q demonstration of p proper p
operation during DG load shedding, including a test of complete loss of load Consistent with STS, current SR provides a loading band between 90% and 100% of continuous DG rating (2340 kW to 2600 kW)
DG maximum loading at 60.8 Hz and 4340 V (2663 kW)) exceeds continuous DG ratingg ((2600 kW))
16
Issues to be Resolved by LAR Current SR capability test load values do not meet RG 1.108, Rev 1 requirements RG 1.108,, Rev 1 requires q demonstration of full-load-carrying capability (continuous DG rating) for intervals not less than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> (SR 3.8.1.3) and 24 ho hours rs (SR 3.8.1.14) 3 8 1 14)
Consistent with STS, current SRs provide a loading band between 90% and 100% of continuous DG rating (2340 kW to 2600 kW) for full-load-carrying capability tests 17
Issues to be Resolved by LAR Non-conservative Non conservative TS SR 3.8.1.9 Current SR 3.8.1.9 allows 2.4 seconds for voltage and frequencyy recoveryy after a large g load rejection.
RG 1.108, Rev 1 position 2.a.(4) requires d
demonstration t ti that th t voltage lt andd speed d requirements are met after a large load rejection SG 9 requires voltage and frequency recovery in 1.6 seconds.
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Issues to be Resolved by LAR Address NRC Temporary Inspection Procedure Items did not analyze y for all p postulated accidents did not assume a single limiting failure did not analyze y at limiting g voltage g and frequency y
values did not incorporate momentary loads did not include manually initiated loads 19
DCPP DG Loading Analyses PG&E commissioned DG Load Study Analyses to evaluate vital 4160 V Engineered Safety Features (ESF) bus loading under various Design Basis Accident (DBA) Scenarios Addresses NRC senior resident inspector observations b ti related l t d tto NRC TTemporary IInstruction t ti 2515/176 Address dd ess NRC CCCDBI Inspection spec o Finding d g related e a ed too ambient air temperature derate.
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DCPP DG Loading Analyses The following DBAs are considered in the DG L di A Loading Analyses:
l Event 1: Large Break Loss of Coolant Accident (LBLOCA)
Event 2: Small Break Loss of Coolant Accident (SBLOCA)
Event 3: Steam Generator Tube Rupture (SGTR)
Event 4: Steamline Rupture Inside Containment at Power Event 5: Steamline Rupture Inside Containment at Hot Zero Power Event 6: Feed Line Break Event 7: Loss off Normal Feedwater Event 8: Loss of Offsite Power (LOOP)
Event 9: Station Blackout (SBO) 21
DCPP DG Loading Analyses The following vital 4160 V ESF bus loading cases are considered for each of the postulated DBAs evaluated in the DG Loading Analyses:
Case 1 C 1: All DG DGs operating, ti allll vital it l 4160 V ESF b buses (F (F, G & H) energized with single component failure considerations Case 2: Vital 4160 V ESF bus F has failed resulting in accident l d b loads being i supplied li d b by vital it l 4160 V ESF b buses G and dH Case 3: Vital 4160 V ESF bus G has failed resulting in accident loads being supplied by vital 4160 V ESF buses F and H Case 4: Vital 4160 V ESF bus H has failed resulting in accident loads being supplied by vital 4160 V ESF buses F and G 22
DCPP DG Loading Analyses DG Loading Analyses inputs and assumptions Both limiting single component failures and vital 4160 V ESF bus failures were considered in the analyses to determine the maximum steady state mechanical load demands on the vital 4160 V ESF buses As-installed vendor pump/fan curves were utilized to determine the most limiting mechanical loading considering either the actual equipment performance or the equipment run-out conditions where appropriate 23
DCPP DG Loading Analyses DG Loading Analyses inputs and assumptions No credit was taken for any Time Critical Operator Actions to reduce vital 4160 V ESF bus loading Some credit was taken for delays y in Operators p manually y starting g
loads (based on plant conditions and administratively controlled)
Some credit was taken for administratively controlling electrical configuration g
Load after 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> reduced due to lower auxiliary feedwater flow demands Load after 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> reduced due to lower containment spray flow demands 24
DCPP DG Loading Analyses The summarized vital 4160 V ESF bus loading results from the DG Loading Analyses with the DG operating at the proposed maximum steady state frequency of 60.8 Hz and 4340 V are as follows:
Loading < Loading Loading Unit DG Bus Description Power Factor 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 2-3 hours > 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> Event 1, Case 4; 1-3 F LBLOCA, Bus H is 2654 kW 2593 kW 2593 kW 84.6%
De-Energized Event 1, Case 4; 1 1-2 G LBLOCA, Bus H is 2648 kW 2648 kW 2338 kW 85.4%
De-Energized Event 1, Case 3; 1-1 H LBLOCA, Bus G is 2614 kW 2553 kW 2229 kW 86.6%
De-Energized Event 1, Case 4; 2-3 F LBLOCA, Bus H is 2663 kW 2602 kW 2602 kW 84.6%
De-Energized De Energized Event 1, Case 4; 2 2-1 G LBLOCA, Bus H is 2641 kW 2641 kW 2330 kW 85.1%
De-Energized Event 1, Case 3; 2-2 H LBLOCA, Bus G is 2592 kW 2531 kW 2207 kW 86.6%
De-Energized g
25
DCPP DG Loading Analyses The DG Loading g Analyses y demonstrate that the DGs have sufficient capacity and margin to fulfill the onsite power source requirements established in GDC 17,, Electric Power Systems, y , 1971 The DG Loading Analyses demonstrate the DGs satisfy SG 9, Reg lator Position C Regulatory C.44 req requirement irement that the peak contin continuous o s steady-state loading of the DGs under maximum output frequency and voltage following a postulated DBA does not exceedd th the smaller ll off th the 2000 2000-hr h DG rating ti (2750 kW) kW), or 90% of the 30-minute DG rating (90% of 3056 kW = 2750 kW) 26
Scope of TS Changes SR 3.8.1.2 (DG start from standby)
Steady state voltage and frequency ranges revised SR 3.8.1.3 (1-hour DG capability test)
DG full full-load-carrying load carrying capability test band revised Added DG cooling systems function within design limits SR 3.8.1.4 (fuel oil day tank volume)
Day tank fuel oil requirement revised SR 3.8.1.7 (DG start from standby)
Steady state voltage and frequency ranges revised 27
Scope of TS Changes SR 33.8.1.9 8 1 9 (DG partial load rejection)
Voltage and frequency recovery time limit revised.
SR 3.8.1.10 (DG full load rejection)
DG operating PF value revised DG full-load rejection test load value revised Added note allowing PF > 0.84 if DG synchronized with offsite p
Steady state voltage and frequency ranges revised 28
Scope of TS Changes SR 33.8.1.12 8 1 12 (DG start from SIS)
Steady state voltage and frequency ranges revised SR 3.8.1.14 (24-hour DG capability test)
DG operating PF value revised DG 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> full-load-carrying capability test load values revised Added DG cooling systems function within design limits Added note allowing PF > 0 0.84 84 if DG synchronized with offsite power 29
Scope of TS Changes SR 33.8.1.15 8 1 15 (DG hot re re-start start test)
DG full-load-carrying capability pre-test load values revised Steady state voltage and frequency ranges revised SR 3.8.1.19 (DG Start LOOP and SIS)
Steady state voltage and frequency ranges revised SR 3.8.1.20 (All DGs start from standby)
Steady state voltage and frequency ranges revised 30
Specific TS Changes SR 3.8.1.2 (DG start from standby)
Current steady state voltage band revised from 3785 V and 4400 V to 3980 V and 4340 V Current steady state frequency band revised from 58.8 Hz and 61.2 Hz to 59.2 59 2 Hz and 60.8 60 8 Hz Revised maximum steady state voltage and frequency to reduce post-accident DG loading.
Instrument uncertainty values included in surveillance test procedures 31
Specific TS Changes SR 3.8.1.3 (1-hour (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> DG capability test)
Current loading band revised from 2340 kW and 2600 kW to 2680 kW and 2750 kW Minimum load band value bounds maximum DG loading at frequency of 60.8 Hz and voltage of 4340 V Maximum load band value allows for immediate retest Added DG cooling systems function within design limits Establishes compliance with RG 1.108 Rev. 1 Position 2.c(2) 32
Specific TS Changes SR 3.8.1.4 (fuel oil day tank volume)
Current DG day tank volume revised from > 250 gal to > 258 gal of usable fuel oil Minimum volume value bounds fuel consumption at 2000-hour 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> DG rating and maximum DG loading at 60.8 Hz / 4340 V Meets ANSI N195-1976 requirement to ensure each day tank contains fuel oil for at least 60 minutes of operation assuming fuel oil consumption with the DG running at 100% continuous rated load plus a minimum additional fuel oil volume margin of 10%
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Specific TS Changes SR 3.8.1.7 (DG start from standby)
Current steady state voltage band revised from 3785 V and 4400 V to 3980 V and 4340 V Current steady state frequency band revised from 58.8 Hz and 61.2 Hz to 59.2 59 2 Hz and 60.8 60 8 Hz Revised maximum steady state voltage and frequency to reduce post-accident DG loading No change to transient minimum voltage or frequency values Instrument uncertainty values included in surveillance test procedures 34
Specific TS Changes SR 33.8.1.9 8 1 9 (DG partial load rejection)
Current voltage recovery time limit revised from 2.4 seconds to 1.6 seconds Current frequency recovery time limit revised from 2.4 seconds to 1.6 seconds Restores compliance to RG 1.08 Rev. 1 Position 2.a.(4)
No change to the voltage or frequency ranges 35
Specific TS Changes SR 3.8.1.10 (DG full load rejection)
Current loading band revised from 2340 kW and 2600 kW to 2680 kW and 2750 kW Minimum load band value bounds 2000-hour DG rating and maximum DG loading at 60.8 Hz/4340 V Current PF revised from 0.87 to 0.84 to bound DG load analysis minimum power factor of 0.846 Consistent with STS, note is added that if grid conditions do not permit, the PF is not required to be met and shall be maintained as close as practicable 36
Specific TS Changes SR 3.8.1.11 (LOOP)
Current steady state voltage band revised from 3785 V and 4400 V to 3980 V and 4340 V Current steady state frequency band revised from 58.8 Hz and 61.2 Hz to 59 59.2 2 Hz and 60 60.88 Hz Revised maximum steady state voltage and frequency to reduce post-accident DG loading Instrument uncertainty values included in surveillance test procedures 37
Specific TS Changes SR 3.8.1.12 (DG start from SIS)
Current steady state voltage band revised from 3785 V and 4400 V to 3980 V and 4340 V Current steady state frequency band revised from 58.8 Hz and 61.2 Hz to 59 59.2 2 Hz and 60 60.88 Hz Revised maximum steady state voltage and frequency to reduce post-accident DG loading No change to the transient minimum voltage or frequency values Instrument uncertainty values included in surveillance test procedures 38
Specific TS Changes SR 3.8.1.14 (24-hour (24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> DG capability test)
Current loading band for 2-hr portion revised from 2600 kW and 2860 kW to 2750 kW and 2860 kW Current loading band for 22-hour portion revised from 2340 kW and 2600 kW to 2680 kW and 2750 kW Minimum load band values bound maximum DG loading at maximum 60.8 Hz / 4340 V (worst case steady-state accident load) 39
Specific TS Changes SR 3.8.1.14 (24-hour (24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> DG capability test)
Current PF revised from 0.87 to 0.84 to bound DG load analysis minimum power factor of 0.846 Consistent with STS STS, note is added that if grid conditions do not permit, the PF is not required to be met and shall be maintained as close as practicable Added DG cooling systems function within design limits Establishes compliance with RG 1.108 Rev. 1 Position 2.c(2)
Minimum load band value is an exception to RG 1.108 Rev 1 Position C C.2.a.(3) 2 a (3) to test at load equivalent to 2-hour 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> rating (2860 kW) 40
Specific TS Changes SR 3.8.1.15 (DG hot re-start re start test)
Current loading band for pre-test DG operation revised from 2340 kW and 2600 kW to 2680 kW and 2750 kW Meets RG 1.108, Rev 1, Regulatory Position C.2.a.(5) requirements to demonstrate functional DG capability at full-load temperature conditions 41
Specific TS Changes SR 3.8.1.15 (DG hot re-start re start test)
Current steady state voltage band revised from 3785 V and 4400 V to 3980 V and 4340 V Current steady state frequency band revised from 58.8 Hz and 61.2 Hz to 59 59.2 2 Hz and 60 60.88 Hz Revised maximum steady state voltage and frequency to reduce post-accident DG loading No change to the transient minimum voltage or frequency values Instrument uncertainty values included in surveillance test procedures 42
Specific TS Changes SR 3.8.1.19 (DG Start LOOP and SIS)
Current steady state voltage band revised from 3785 V and 4400 V to 3980 V and 4340 V Current steady state frequency band revised from 58.8 Hz and 61.2 Hz to 59 59.2 2 Hz and 60 60.88 Hz Revised maximum steady state voltage and frequency to reduce post-accident DG loading Instrument uncertainty values included in surveillance test procedures 43
Specific TS Changes SR 3.8.1.20 (All DGs start from standby)
Current steady state voltage band revised from 3785 V and 4400 V to 3980 V and 4340 V Current steady state frequency band revised from 58.8 Hz and 61.2 Hz to 59 59.2 2 Hz and 60 60.88 Hz Revised maximum steady state voltage and frequency to reduce post-accident DG loading No change to the transient minimum voltage or frequency values Instrument uncertainty values included in surveillance test procedures 44
Specific TS Bases Changes TS 3.8.1 Bases Addition of statement that DG loads in SRs 3.8.1.3, 3813 3 3.8.1.10, 8 1 10 3.8.1.14 and 3.8.1.15 that no instrument uncertainties for test load values included in surveillance procedures DG test load values are not modeled in accident analyses DG test load values are limited by vendor ratings (define maintenance intervals)
Instrument uncertainty for DG load displayed by digital meters on the control room vertical board = 90 kW Applying 90 kW uncertainty to each side of test load band adds 180 kW and could unnecessarily operate DG above rated values 45
Specific TS Bases Changes TS 3.8.1 Bases Addition of statement that DG loads in SRs 3.8.1.3, 3813 3 3.8.1.10, 8 1 10 3.8.1.14 and 3.8.1.15 that no instrument uncertainties for test load values included in surveillance procedures (cont.)
DG load analyses assume simultaneous maximum 60.8 60 8 Hz / 4340 V V, difference in DG loading at nominal frequency (60 Hz) and voltage (4160 V) is ~109 kW DG load analyses y assume simultaneous operation p of all intermittent loads (~77 kW), several of which require operator to start and may not be used DG load analyses assumptions are considered to bound instrument uncertainty t i t for f load l d ttesting ti values l
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Specific TS Bases Changes TS 3.8.1 Bases E hb Each bases section ti ffor revised i d TS is i updated d t d tto Reflect the new TS values and ranges Describe how the TS values and ranges comply with various Regulatory Guides (Safety Guides) and associated NRC Position Statements 47
DG Load Margin Program Planning has begun to uprate DGs and reduce DG loading physically DG low margin entered into DCPP Margin Management Program and ranked High Risk DG uprate feasibility studies completed DG uprate and load reduction options have been selected and are in the funding approval process DG uprate and associated testing program will require NRC approval 48
Staff Feedback Staff Feedback 49 49