ML20093A818
| ML20093A818 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 10/02/1995 |
| From: | Mehaffey R OMAHA PUBLIC POWER DISTRICT |
| To: | |
| Shared Package | |
| ML20093A819 | List: |
| References | |
| EA-FC-95-027, EA-FC-95-027-R00, EA-FC-95-27, EA-FC-95-27-R, NUDOCS 9510110110 | |
| Download: ML20093A818 (88) | |
Text
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PRODUCTION ENGINEERING DIVISION PED-QP-5.1 QUALITY PROCEDURE FORM R6 PAGE 1 OF 2 EA COVER SHEET la EA-FC- 95-027 Rev. No. O EA Page No. 1 Total Pages_324T " l EA TITLE: Diesel Generator Offnormal Loading Due to a Full Speed Start ETP-6.5-DGT QA CATEGORY: REPORT TYPE:
[x] CQE [] Fire Protection [] Revision
[] Non CQE [] Limited CQE [] Analytical Report )
(x] Special j Does this change Does this analysis Does this change require a DBD identify any require a USAR Revision? potentially reportable Revision?
conditions?
[ ] YES [x] NO [] YES [x] NO (] YES [x] NO INITIATION:
Responsible PED Department DEN Electrical /T&C Responsible Department Head /r3 M <d 'I ~9 Date 2d S /Cf
// ,)//
Preparer R. F. Mehaffev Date 9/22/95
- Mgr - Station Eng./Mgr - DEN Date PED Department No. 356 Due Date 10/20/95 I ENGINEERING ANALYSIS TYPE:
Electrical Equipment Qualification (EEQ) () Computer Code Error Seismic' Equipment Qualification (SEQ) () Analysis (CCE) ()
Core Reload Analysis (CRA) [] Nuclear Mat'l Fire Protection Analysis (FPA) () Accountability (NMA) [ ]
Cable Separation Analysis (CSA) [] Operations Support Associated Circuits Analysis (ACA) () Analysis (OSA) (x]
Safe Shutdown Analysis (SSA) [] USAR Justification OTHER: [] (USJ) (}
- Only required when independent review authorization is required.
DISTRIBUTION:
Copy Copy Group Name & Location Sent (X) Group Name & Location Sent (X) 352 Supervisor -
System Engineering 9510110110 951002 PDR ADOCK 05000285 S PDR
OCT-02-1H5 '5: 14 F.02
]
i PRODUCTION ENGINEERING DIVISICN PED-QP-5.1
) QUALITY PROCEDURE FORM R6 PAGE 2 OF 2 i
1 EA-FC- 95-027 Rev. No. 0 EA Page No.-_-2 Total Pages 6 PREPARATION /REV W:
Preparer (s) / [ // ^ ,4/ / 10/2N6 51@rraturQj( { [ ] Datd j Reviewer (a) [MA b A
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//o/dff j Signature / \ f ,7,q:A Data f Independent Reviewer (s) / Am \_ h /Date
/6 Adf Signature (
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[
AFFECTED DOCUMENTS:
! Responsible Title Revision Division / Dept i
a l
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, l I
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l AFFECTED SYSTEM / EQUIPMENT:
System Tag No. (s) l
, EE DG-1. DC-2 i
i 1
i 4
l i
l
- i l
l PRODUCTION ENGINEERING DIVISION PED-QP-5.4 QUALITY PROCEDURE FORM R6 EA-FC- 95-027 Page No. 3 RECORD OF REVISION Rev. No. Description / Reason for Change 0 Initial Issue
5:T-01-1??! 15:14 c.0 PRODUCTION ENGINEERING DIVISION PED-QP-5.2 QUALITY PROCEDURE FORM R6 PAGE 4 OF 3 EA-FC- 95-027 REV. No. O Page No. 4 EA REVIEW CHECKLIST YES NO N/A
- 1. Does the PURPOSE section adequately and correctly state j the reasons or the need to prepare the EA? /
- 2. Does the EA adequately and correctly address the P' concerns as stated in the PURPOSE section?
- 3. Are the RESULTS AND CONCLUSIONS stated and reasonable v' and supportive of the PURPOSE and SCOPE?
- 4. Were the methods used in the performance of the Analysis appropriately applied? v' ___
- 5. Have adjustment factors, uncertainties and empirical correlations used in the analysis been correctly /
applied?
- 6. Were the INPUTS correctly selected and incorporated /
into the EA?
- 7. Are all INPUTS to the ANALYSIS correctly numbered and referenced such that the source document can be readily "'
1 I
retrieved?
- 8. Were the ASSUMPTIONS used to prepare the EA adequately ,/
documented? ___
- 9. Have the appropriate REFERENCE and the latest revisions v' been' identified?
- 10. Have the REFERENCES been appropriately applied in the preparation of the EA? _ki
- 11. Is the information presented in the ANALYSIS accurate v' and clearly stated in a logical manner?
- 12. If manual calculations are presented in the ANALYSIS are they:
V
' a. free from mathematical error?
- b. appropriately documented commensurate *with the scope of the analysis?
/
2
- 13. Have the affected documents, identified on the PED-QP-5.1 form been accuratel k d up and included
.with a 10CFR50.59 evaluation (y mar eif applicable)? V' YES NO N/A
- 14. Is the EA free of unconfirmed references and .j/
assumptions?
c.03 CCT-02-1995 '5:15 PED-QP-5.2 PRODUCTION ENGINEERING DIVISION R6 QUALITY PROCEDURE FORM PAGE 5 OF 3 EA-FC _95-027 REV. No. O Page No. 5 20
- 15. Have all crossouts or overstrikes been initialed and v' .)$
dated by the Preparer / Reviewer?
- 16. Is the EA legible and suitable for reproduction and /
microfilming?
- 17. Has the EA Cover Sheet been appropriately completed? /
4 18. For Rav4 miens only, is the change identified and 'the reason for the change provided on the Record of /
'Aevision Sheet?
d 1
- 19. Dces the computer run have page number ang alphanumeric v' h(_"
program number on every sheet?
- 20. Is the listing or file reference of the final computer v/'
input and output provided?
- 21. Is the computer code title and version / level properly !
documented in the EA?
PED-MEI-23,
- 22. Is the identification number (Ref.
Section 5.3.1) on the cover sheet as part of the EAs
, v#
description?
9 NOTE: Only applies to DEN Mechanical and Electrical /I&C l
Departments.
v!
- 23. Are final computer runs correctly identified? ~
- 24. Is the computer program validated and verified in v' accordance with NOD-QP-SS
- 25. If the computer program was developed for limited or onetime use and not validated and verified in accordance with NOD-QP-5, has a functional description of the program, identification of the code (title, revision, manufacturer), identification of the software and brief user's instructions been documented in the EA?
_'_ /
- 86. Is the modeling correct in terms of geometry input and initial conditions?
1
,.7 OCT-02-1Mr :s:it PED-QP-5.2 PRODUCTION ENGIN'EERING DIVISION RE QUALITY PROCEDURE FORM PAGE 6 OF 3 I
EA-FC- 95-027 REV. No. O Page No. 6 YES NO N/A 1
- 37. If the analysis has identified a condition that may be l
outside the design basis of the plant, has a PED-QP-19 d-
! reportability evaluation been completed?
NOTE: Applicable only to analysis of existing ']
conditions.
1 NOTE: For all "No" responses, a written comment shall be documented on Comment Form PED-QP-5.5 briefly explaining the deficiency and, as appropriate, providing a suggested resolution. l f
, I COMMENTS: !
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WA / /o /i/95 4 Lv6 c
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Reviewer (s) Signature / Date Department / Organization f
i
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-PRODUCTION ENGINEERING DIVISION PED-OP-5.2 QUALITY PROCEDURE FORM R6 -
PAGE 1 OF 3 EA-FC- 96-007 REV. No. O Page No. /
- EA REVIEW CHECKLIST YES NO N/A
- 1. Does the PURPOSE section adequately and correctly state j
-the reason: or the need to prepare the EA? V 4
- 2. Does the EA adequately and correctly address the y concerns as stated in the PURPOSE section? v
- 3. Are the RESULTS AND CONCLUSIONS stated and reasonable and supportive of the PURPOSE and SCOPE? /
- 4. Were the methods used in the performance of the f Analysis appropriately applied? V
-5. Have adjustment factors, uncertainties and empirical correlations used in the analysis been correctly applied? /
, 6. Were the INPUTS correctly selected and incorporated into the EA? !
- 7. Are all INPUTS to the ANALYSIS correctly numbered and referenced such that the source document can be readily retrieved? V'
- 8. Were the ASSUMPTIONS used to prepare the EA adequately j
. documented? v
- 9. Have the appropriate REFERENCE and the latest revisions :
. been identified? /
2 -10. Have the REFERENCES been appropriately applied in the l preparation of the EA? v! l
- 11. Is the information presented in the ANALYSIS accurate and clearly stated in a logical manner? V l
- 12. If manual calculations are presented in the ANALYSIS l j are they: l
- a. free from mathematical error? ,
,/ \
l b. appropriately documented commensurate with the '
j scope of the analysis? V
. 13..Have the affected documents, identified on the PED-QP-5.1 form been accurately marked up and included /
with a 10CFR50.59 evaluation (if applicable)? V 4
5
j ,
'PRODUCTIONLENGINEERING DIVISION PED-QP-5.2 QUALITY' PROCEDURE, FORM- R6 L PAGE 2 OF 3 EA-FC- A f-02 7 REV. No. O Page .No. / c!
YES NO N/A
- 14. Is the EA free"of unconfirmed references and j-
' assumptions? v i 15. Have all crossouts or overstrikes been; initialed and '
o dated by the Preparer / Reviewer? / ,
- 16. Is_the EA legible and suitable for reproduction and j microfilming? /
i
- 17. Has'the EA Cover Sheet been appropriately completed? v/
! 18. For Revisions only, is the change identified and the i
reason for the change provided on-the Record of j
- Revision Sheet?- V 1
- 19. Does the computer run have page number ans alphanumeric program number on every sheet? v
- 20. Is the listing orffile reference of the final computer' ,
input and output provided? V )
l
- 21. Is the computer code title and version / level properly !
documented in the EA? / l 1
2
- 22. Is the identification number (Ref. PED-MEI-23,
- l. Section 5.3.1) on the cover sheet as part of the EAs y
- description? V i
- NOTE
- Only applies to DEN Mechanical and Electrical /I&C Departments.
- 23. Are final computer runs correctly identified? V 2
- 24. Is the computer program validated and verified in j accordance with NOD-QP-5? V
- 25. If the computer program was developed for limited or onetime use and'not validated and verified in accordance with NOD-QP-5, has a functional description of the program,. identification of the code-(title, revision, manufacturer), identification of the software and brief user's instructions been documented in the j EA? v
^
- 26. Is the modeling correct in terms of geometry input and g ,
initial conditions? ' gec Cdmmen 7 on ney1 paye
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l PED-QP-5.2 PRODUCTION ENGINEERING DIVISION QUAL 2TY PROCEDURE FORM R6 I PAGE 3 OF 3 EA-FC- 9f /)27 REV. No. O Page No. 'C l
YES NO N/A
- 27. If the analysis has identified a condition that may be outside the design basis of the plant, has a PED-QP-19 j reportability evaluation been completed? v NOTE: Applicable only to analysis of existing conditions.
NOTE: For all "No" responses, a written comment shall be documented on Comment Form PED-QP-5.5 briefly explaining the deficiency and, as appropriate, providing a suggested resolution.
COMMENTS: N . b n M u n /^ fb w S 2 5-V
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PRODUCTION ENGINEERING DIVISION PED-QP-5.3 QUALITY PROCEDURE FORM R6 1 PAGE 1.'OF 2 l EA-FC- 4f-Od 7 REV. No. 6) Page No.
i EA INDEPENDENT REVIEW CHECKLIST I YES NO N/A
- 1. Were the INPUTS correctly selected and-incorporated
/
into the EA? V 2, .Nre the ASSUMPTIONS necessary to perform the EA l adequately described and reasonable and appropriately.
documented?- 1/
- 3. If applicable, have the appropriate QA requirements #
i been specified? V l 4. Are the applicable codes, standards and regulatory 1 l
requirements including issue and addenda properly identified and the requirements correctly applied in- y j the EA? V
- 5. Is the approach used in the ANALYSIS section appropriate for the scope of the EA? V
]
- 6. Were the methods applied in the performance of the j
! ANALYSIS appropriate? v i
j 7. Has applicable operating (mperience been considered (e.g. for replacement parts / components, has NPRDS, L INPO, NRC, industry experience been used supporting the j application)? V l
! 8.- Have any interface requirements been appropriately i considered (e.g. between disciplines, Divisions, etc.)? V
! 9. Are the results and conclusions reasonable when /
l compared to the purpose and scope? V i
- 10. Has the impact on Design Basis Documents and the USAR /
i been correctly identified and considered? v _ _ ,
t
- 11. Have all applicable licensing commitments regarding the /
- subject EA been met? V 1
i i
NOTE: For all "No" responses, a written comment shall be documented on Comment Form PED-QP-5.5 briefly explaining the deficiency and, as appropriate, providing a suggested resolution.
PRODUCTION ENGINEERING DIVISION PED-QP-5.3 QUALITY PROCEDURE FORM R6 PAGE 2 OF 2 EA-FC- O 6-02 9 REV. No. O Page No. 7 COMMENTS: I i
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k buwv / lA O 5 bhN ~ $fEC Yf I ependeFRe' viewer (s) / Date Department /Organiz$ tion
, Si ature i
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. .I PRODUCTION ENGINEERING DIVISION PED-QP-5.5 QUALITY PROCEDURE FORM R6 COMMENT FORM EA-FC- 95-027 Rev. No. O Page No.
Reviewer Organization Page of EA Title Date Comment Comment Type ,,
Number Code
- Page Comment Resolution
~~L i
l COMMENT TYPE CODES
- RESOLUTION CATEGORY **
- Editorial (ED) System Interaction / 1= Resolution Required
- Technical (TC) Design Change (DCC) 2=Nonmandatory Recommendation
EA-FC-95-027 l
Rev. O Page 10 TABLE OF CONTENTS T
Page Number 1.0 PURPOSE 11 2.0 SCOPE 11 3.0 INPUTS / REFERENCES TO THE ANALYSIS 12 4.0 ASSUMPTIONS 13
- q. 5.0 ANALYSIS 13 1
- 6.0 RESULTS AND CONCLUSIONS 21 7.0 DESIGN AND/OR LICENSING BASIS CHANGES 21 i 8.0 LIST OF ATTACHMENTS 21 t
t t
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1 f
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e EA-FC-95-027 l Rev. O Page 11 1.0 Purpose 1.1 Event Description From IR 950579 l 1
Following a reactor trip at 11:15 August 24, 1995 each diesel started as designed.
DG-2 accelerated to the correct idle speed (500 rpm) but DG-1 accelerated to 900 rpm. DG-1 should not have ]
accelerated-DG-1 to full speed. The full speed signal generated by low 4160V bus voltage had not actuated. .DG-1 was shut down at I approximately 11:45. The problem that caused DG-1 to accelerate to ;
full speed was determined to be that the governor was in the full.
- speed position. The governor had been left in the full speed' I position on a ' previous test and not returned to the idle speed position.
1.2 Analysis Purpose ;
This analysis is to assess the ability of DG-1 to accelerate the ESF 4160V and 480V loads in an off normal sequence following a DBA ;
and a subsequent grid degraded voltage. The sequence of events of i concern is a DBA (Large Break LOCA) requiring automatic ESF response (Safety Injection Actuation Signal-SIAS and Containment Spray Actuation Signal-CSAS) followed by an Offsite Power Low Signal-OPLS actuation due to a . . . offsite power condition.
The OPLS occurs after'the final ESF load (VA-7C) on ESF Train A has begun to accelerate to full speed.
If the engine governor is mispositioned, DG-1 can be operating at full speed and reenergizes the 4160V and 480V buses before the 480V Load Center undervoltage time / voltage relays and associated fixed time delay relays have time to initiate the 480V Load Center load shed. The operating 480V Load Center loads would load as DG dead loads (at the time of DG breaker closure.) Dead loads could include both ESF loads and non-safety loads such as an Air Compressor and Condenser Vacuum Pump.
2.0 Scope The scope of this analysis is to provide a best estimate of the event using a computer model of DG-1 and its associated electrical
i r
EA-FC-95-027
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Rev. O Page 12 distribution system to find the affect of the off normal loading
- sequence. The best estimate model will use the nominal ESF Load i Sequencer times (see Attachment 8.1) to determine the affect of the
- loads on DG-1.
3.0 Inputs / References i 3.1 EA-FC-92-072 Diesel Generator Transient Analysis a
l 3.2 EA-FC-93-027 Loss of Voltage IAV Relay Setpoints !
I 3.3 EA-FC-91-142 Calibration Procedure Setpoint Determination j in Support of MR-FC-89-013 (480V Load Center j Breaker Setpoints and Time vs. Current Curves) i
- 3.4 G.E. Letter E.I. Hersh to Bob Mehaffey 8/15/78 Diesel Generator Exciter i 3.5 FC03382 Diesel Generator LOCA Loads Revisions 4 and 8 3.6 OP-ST-ESF-0002 Diesel Generator No.1 and Diesel Generator No. l
- 2 Auto Operation i
l 3. 7 EPRI TR-102.814 A Methodology for Determining an EDG's
- Capability to Start Its Emergency Loads 1
3.8 EAR 94-017 OPLS Relay Timing Accuracy i
} 3.9 Drawings:
i 161F597 Sheet 8 (9808) ESF Auto Close Circuit l
~
0223RD455 Sheet 10 (9953) DG-1 Breaker Close/ Trip Circuit j 11405-E-13 Sheet 4 (57238) Bus 1A3 Voltage Relaying 2 11405-E-18 Sheet 1 (12254) Bus 1B3A, 1B3A-4A Voltage Relaying 3.10 IR 930579 DG-1 Full Speed Start, LER 95 06 3.11 ERF Archival Dump DG-1 Voltage Point Y3257 Reactor Trip at
. 11:15 August 24, 1995 DG-1 Time to Full Speed Estimate
-- -- --- - - - -. - - , a
W
! EA-FC-95-027 Rev. 0 Page 13
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3.12 IAV and Fixed Delay 4160V and 480V Calibration Procedures
- (typical) i
- , SP-CP-08-1A3-IAV SP-CP-08-480-1B3A-4A i 3.13 USAR. Table 14.15-2 Large Break LOCA Sequence of Events 3.14 SP-CP-08-DEVAR-1A3 OPLS time delay
{ 3.15 Gould Shawmut Amp-trap Fuse Data A25X100 3.16 OP-ST-ESF-0009 Channel "A" Safety Injection, Containment Spray and Recirculation Actuation Signal Test 3.17 DG-1 Auto Operation Plot from EA-FC-92-072 4.0 Assumptions
- 4.1 This analysis is intended to provide a best estimate of the response of DG-1 to the off normal load sequence. The sequencer timers will be at the nominal setpoint.
4.2 .See the Analysis section 5.0 for specific assumptions.
4.3 MCC contactors drop out on loss of voltage (virtually instantaneously) and are not of concern in this analysis.
1 5.0 Analysis I
5.1 Sequence of Events An investigation was performed to find which of the sequences of events could result in the Diesel Generator being loaded in an off normal sequence. The sequence of events of concern is a DBA (Large Break LOCA) requiring full ESF response (both Safety Injection and Containment Spray) and a Loss of Offsite Power (LOOP) at some point in time. There are three possible scenarios:
1 Large Break LOCA coincident with a Loss of Offsite Power-the
i J
, EA-FC-95-027 Rev. O ;
I Page 14 Diesel Generator governor is mispositioned allowing I acceleration to 900 rpm at the maximum rate. See Table l' I Attachment 8.1.
2 Large Break LOCA with a subsequent Loss of Offsite Power-the Diesel Generator governor is mispositioned allowing acceleration to 900 rpm at the maximum rate. See Table 2 Attachment 8.1.
3 Large Break LOCA with a subsequent Degraded Offsite Power-the Diesel Generator governor is mispositioned allowing acceleration to 900 rpm at the maximum rate. See Table 3 Attachment 8.1.
The data in Attachment 8.1 (based on EAR 94-017) was used to find the maximum HPSI flow to the core time. Although the subsequent analysis uses nominal times the data in Attachment 8.'1 serves to identify the sequence of events of concern. Attachment 8.1 Table 4 provides the normal response to a LBLOCA coincident with a LOOP where the Diesel Generator goes to idle speed.
Table 3 of Attachment 8.1 can be used to find the off normal sequence of events. Attachment 8.7 provides excerpts of the data used in Attachment 8.1.
l The off normal sequence (with governor mispositioned) is a LBLOCA l where at some point into the DBA when all ESF loads have sequenced !
on the offsite power, the offsite power Voltage degrades to the OPLS setpoint.
After the OPLS time delay the offsite power is
)
tripped, the Diesel Generators given a full speed signal (although already running at 900 rpm), the ESF load sequencers reset, and the i 4160V Load Shed initiated.
The design of the ESF associated electrical system requires that if offsite power is lost the 480V Load Centers must remain deenergized for a nominal 2.2 seconds to allow the GE IAV undervoltage time / Voltage relays and associated Agastat fixed time delay relays time to operate. This time delay to deenergize the buses is provided by the time required for the Diesel Generator to accelerate from idle speed to full speed, see Attachment 8.1.
l The under Voltage relays trip the 480V Load Centers' rotating loads l
1
EA-FC-95-027 l Rev. O I Page 15 i
to both reduce the total load expected on the Diesel Generator (by I tripping the non-safety related loads) and allow proper ESF load .
resequencing on the Diesel Generator. The OPLS setpoint 'is .
I designed to maintain 90% of rated motor Voltage on the 480V distribution system.
Ninety percent (90%) motor voltage is such that, if the OPLS setpoint were to be reached, the 480V bus Voltage would remain well above the IAV relay operating range. Attachment 8.2 provides a discussion of relay setting and relay curves for the 4 8 0V 'I AV relays.
If DG-1 is operating at full speed, due to engine governor mispositioning, the time to reenergize the electrical distribution system (480V Load Centers and 4160V Bus) is expected to be a nominal one second. The time delays associated with Diesel Breaker closure are 4160V breaker load shed (virtually instantianeous) and a fixed delay of second. The nominal one second is less than the time required for the undervoltage time / Voltage relays and associated fixed time delay relays to initiate the 480V Load Center load shed. Operating 480V Load Center loads would load as DG dead loads. These loads would include both ESF loads and non-safety loads such as'an Air Compressor and Condenser Vacuum Pump.
Attachment 8.3 compares the sequence of events for the normal response to a DBA-OPLS-DG ESF loading and the off normal sequence described above. The time delays for the relays are bounding maximum delays (the nominal one second breaker closure delay is bounded by an assumed 2-second delay in the sequence of events) .
l The time for DG acceleration to full speed is taken from test data.
5.2 Diesel Generator Load Model i
The off normal load model for DG-1 consists of altering the DG-1 transient analysis model from EA-FC-92-072 to:
i
- 1. Have all 480V Load Center ESF Loads start at T=0, the DG breaker closure time. The loads are SI-2A, AC-3A, SI-2C, CH-1A, AC-3C, VA-3A, SI-3A, and VA-7C.
- 2. Model air compressor CA-1A and Condenser Vacuum Pump FW-8A >
l
-. - j l
f EA-FC-95-027 Rev. O Page 16 as starting at T=0. This model depicts the plant for most of-the eight days of concern. See Attachment 8.4 for the operating data. .
The'DG-1 transient analysis model from EA-FC-92-072 is considered conservative. The' data from diesel generator. load calculation FC03382 shows a load reduction from revision 5 used as the basis for EA-FC-92-72 to the present expected loading as determined in Revision 8. The model used for this analysis has not been revised to reduce the DG loading.
The model and analysis was performed using Electrical Transient l Analyzer Program (ETAP). ETAP is a Personal Computer based application developed and sold by Operations Technology, Inc. of
, Irivine. CA. ETAP version 6.5, serial no. 920MAHAPPD licensed to Omaha Public Power District was used. The program was run on an Intel 486DX processor using Microsoft Corp. MS-DOS version 6.00 i operating system.
5.3 Computer Model Result 5.3.1 Initial Model The initial computer model run was as described in Section 5.2.
See Attachment 8. 5 ,for the computer model time versus Voltage plots.
k 480V Load Center bus voltage plots show that the 480V bus Voltage i does not recover in sufficient time to prevent the operation of the
, 480V Load Center load shed. The off normal starting sequence model must be further refined to account for operation of the 480V Load Centers' load shed relays.
5.3.2 Revised'Model The sequence of events is defined in Attachment 8.3 Table 2. The
- 480V Load Center load shed occurs approximately 1.2 seconds after DG Breaker closure. Bus voltage decay may increase this time delay a small percentage. The 480V bus voltages do not recover to a point high enough to pick up the IAV relays. See Attachment 8.2 for additional discussion on the IAV relays.
. . . _- . . ~. _ _ _ __
d EA-FC-95-027 Rev. O Page 17 The 1.2 seccads is based on total time for the IAV relay to operate on loss of voltage (1.2 seconds) and the nominal fixed time delay of one second less the nominal DG output breaker closure delay time of one second. Any additional time required for voltage decay and relay time uncertainty is accounted for by the difference in the 1.2 seconds after output breaker closure and the first load group breaker closure time. From the timer surveillance data of 9/28/95 the earliest load group 1 breaker closure occurs at 2.8 second, see Attachment 8.7. This allows approximately 1.6 second margin for j uncertainties while keeping the model valid. During the 1.6 second margin, time the 480V Bus voltage remains low assuring a 480V Load
- surveillance test indicates bus voltage decay is complete in 0.5 l
seconds however IAV relay operation begins in approximately 0.1 seconds, see Attachment 8.7 for the DG-1 test data. The voltage decay time is not considered significant. The model is considered valid for the eight days in question.
Each ESF breaker circuit is equipped with an undervoltage load shed bypass from the sequencer circuit. The undervoltage load shed would be removed at the time the sequencer closes the breaker (B relay contacts are used from the same relay that closes the breaker.) This circuit normally prevents breaker tripping from
, possible 480V bus Voltage transients during ESF motor starting.
4 The bypass circuit will also serve to prevent a trip free condition in the event the bus Voltage has not cleared the IAV 480V Load Center Load Shed signal.
l The computer model was revised from that described in Section 5.2 by making the following changes:
1
- 1. Circuit breakers were placed between each 480 Volt motor and the bus that feeds them.
- 2. At t=1.2 seconds after generator breaker closure, all of
, the 480 Volt loads are disconnected from their respective l l 480 Volt busses. I i
- 3. The breaker for each 480 Volt ESF motor is then closed at I
- the normal load sequence time.
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EA-FC-95-027 Rev. O Page 18 The ETAP software has limits to the number of switching' events that can be simulated with it's Dynamic Stability module. This limit allows simulation of 18 seconds of the event after generator breaker closure.
5.4 Revised Model Results The ETAP model results show that DG-1 would start and successfully operate the ESF 4160V and 480V loads associated with ESF Train A.
Bus voltages would be depressed at generator breaker closure causing the 480 volt busses to trip on undervoltage. The sequenced ESF loads would then start at their normal time.
Plots of generator, bus and motor parameters were compared to the results of the original study, EA-FC-92-072. The comparison shows that after the 480 Volt motors are shed at 1.2 seconds after generator breaker closure, all of the parameters match the original study from 3 seconds (first load sequence time) to 18 seconds where the analysis ends.
1 I
5.4.1 Affect on ESF Motor Acceleration Time The 480V Load Center and 4160V ESF motor acceleration times remain the same as those analyzed in EA-FC-92-072. Motor Operated Valves.
modeled in EA-FC-92-072 have already been opened by the offsite l power. The initial low voltage on the buses is not a factor for j the MOV's.
Concentrated boric acid pump CH-4A and the Control Room HVAC unit are the remaining significant dead loads. Their start is delayed by 1.2 seconds. The delay is not considered critical. l The concentrated boric acid pump is use to supply the suction of Charging Pumps. The first Charging Pump sequences on at the second load group (8 seconds) allowing adequate time for the boric acid l pumps to accelerate. There is also available a gravity feed independent of the boric acid pumps.
The 1.2 second delay in Control Room HVAC is not expected to result in any significant Control Room heat up. The Control Room's pressure is not expected to change significantly, as such, in
L EA-FC-95-027 Rev. O j Page 19 leakage of radioactive gases is not expected.
The off normal sequence of events begins reloading the ESF
. equipment approximately 8 seconds earlier than the normal sequence.
The off normal sequence does not have the 8 second idle to full ;
speed acceleration time.
5.4.2 Motor Current Transients ,
Motor transient currents during the 1.2 seconds following the DG-1 breaker closure are not high and would not trip the supply breaker.
Motor starting currents are proportional to motor terminal voltage.
The motor voltages are low, reducing the motor current well below locked rotor current.
5.4.3 Motor Starts - Thermal Damage The.off normal sequence of events would have exposed the motors to one additional start. This start would have occurred on initial DG-1 Breaker closure. This " start" is of short duration, approximately 1.2 seconds. The additional start is truncated when l the 480V Load Center IAV relay load shed occurs. Motor terminal voltage during this start is low (typically less than 50% Voltage.
The reduced motor terminal voltage reduces motor starting current, minimizing motor winding heating. Motors would not have been expected to be damaged by this additional start attempt.
5.4.4 Affects on the Diesel Generator Exciter The Diesel Generator Exciter is rated for 149 amps @ 175V operation for 1 minute. The demand placed on the exciter during the 1.2 seconds before the 480V Load Center load shed actuation is not expected to damage the exciter. In the off normal sequence, neither the magnitude, or the duration excitation voltage peaks are more severe than normal sequence starting transients during the initial 1.2 seconds after generator breaker closure.
The exciter is equipped with a field current forcing circuit that allows higher exciter output for motor starting and faulted conditions. The field current forcing adds a self excitation current to the normal solid state exciter output when the generator
i I
EA-FC-95-027 l Rev. O !
. Page 20 terminal voltage is low. The field forcing component is additive l
to the normal exciter output and is added after the exciter '
protective fuses. The exciter goes to maximum output plus current
- forcing on the normal sequencing of the~ESF loads. In the off normal sequence, neither the magnitude, or the duration excitation voltage peaks are more severe than normal sequence starting
] transients during the initial 1.2 seconds after. generator breaker closure. Note: The DG-1 generator over current protection is bypassed in an emergency start, as such a generator output breaker trip is not expected.
j 5.4.5 Affects on the Generator
.i The affect on the Generator is I 2 t (current squared time) heating caused by the additional 1.2 second off normal transient. This heating is not considered significant because of its short duration (from Attachment 8.6 the field current that drives the generator i
current is well below the the first load group field current.) The worst case winding mechanical stresses are a result of the magnetic stress of a bolted fault on the on the generator terminals. The
. bolted fault is more severe than the load impedance current limiting off normal load case.
5.4.6 Diesel Engine Mechanical Loading 5 Mechanical loading of the engine at the time of generator breaker closure is minimal due to the low output voltage. Motor torque decreases with the inverse of the motor voltage squared which 4
keeps the engine loading minimal for the initial 1.2 seconds.
5.5 Model Conservatism i
The ESF system associated with DG-1 has in it certain conservatism's. The conservatism ensures that the results of the DG-1 load model are correct.
The DG-1 model includen the operation of the motor operated valves that are automatically repositioned in a DBA. These valves would have already been repositioned on offsite power before the i
initiation of OPLS. The loads would not be present on DG-1.
+
9 EA-FC-95-027 Rev. 0 Page 21 4 5.6 ETAP Computer Program Verification The ETAP computer program is a commercial program. Its adequacy -
for use in a Safety Related analysis is verified by its use in a test case. This test case consists of a comparison of the results of an ETAP transient load calculation of the FCS ESF system as it operates in the refueling outage AUTO Operation surveillance test with the actual data recorded during that test. The results of this comparison are contained in EA-FC-92-072 Diesel Generator
! II.ansient Analysis. Results of this verification show that ETAP
) provides conservative results.
In addition to the FCS model verification the program has also been verified in EPRI TR-102814.
Electrical equivalent circuits for the compressor and vacuum pump motors were determined using the ETAP parameter estimat' ion module.
This same module was used and validated by EA-FC-92-072.
ETAP standard speed-torque characteristics for the air compressor and the vacuum pump were used to model the driven equipment. The air compressor was modeled as a reciprocating compressor. The vacuum pump is modeled as a centrifugal compressor.
{
6.0 Results and Conclusions 4
DG-1 and the ESF equipment supplied by DG-1 were operable during time when the DG-1 governor was positioned at the full speed I
setting.
).
7.0 Design Basis and/or Licensing Basis Changes This analysis is for an off normal' condition. The event was reported to the NRC in LER 95 06. There is no change to the Design or Licensing Basis because of this analysis.
T ,
8.0 List of Attachments 1 8.1 DBA Sequence of Events to Define Off Normal Sequence I
i EA-FC-95-027 Rev. O Page 22 1
Table 1 LBLOCA Coincident LOOP DG Governor Set at 900 RPM
, Table 2 LBLOCA followed by OPLS Due to a Loss of Offsite .
Power Actuated during HPSI Start DG Governor Set at 900 RPM 2 Table 3 LBLOCA followed by OPLS Actuated during HPSI Start 4 DG Governor Set at 900 RPM Table 4 LBLOCA Coincident LOOP
, 8.2 480V IAV Relays Setting and Voltage vs Time Curve i
8.3 Sequence of Events for:
Table 1 Expected Normal Response to a DBA-OPLS-DG ESF
- Loading
! Table 2 Off Normal Response Sequence Loading including expected 480V Load Center Load Shed Table 3 Comparison of the Sequence of Events for the Expected Response and the Off Normal Response l Sequence Loading 8.4 ' Equipment Operating Data
- 8.5 Computer Model Results All - ESF Equipment, CA-1A and FW-8A Starting 8.6 Computer Model Results ESF Equipment 480V Load Shed After DG Breaker Closure 8.7 Miscellaneous Input Data OP-ST-ESF-0002 Diesel Generator No.1 and Diesel Generator No.
2 Auto Operation Excerpt ERF Archival Dump DG-1 Voltage Point Y3257 Reactor Trip at 11:15 August 24, 1995 DG-1 Time to Full Speed Estimate U
i
l-t j EA-FC-95-027 4
Rev. 0
- Page 23
. IAV and Fixed Delay 4160V and 480V Calibration' Procedures (typical) Excerpts SP-CP-08-1A3-II.V SP-CP-08-480-1B3A-4A 4
USAR Table 14.15-2 Large Break LOCA Sequence of Events l
4 SP-CP-08-DEVAR-1A3 OPLS time delay Excerpt Gould Shawmut Amp-trap Fuse Data A25X100 i OP-ST-ESF-0009 Channel "A" Safety Injection, Containment Spray and Recirculation Actuation Signal Test j
DG-1 Auto Operation Plot from EA-FC-92-072 8.8 G.E. Letter E.I. Hersh to Bob Mehaffey 8/15/78 Diesel Generator Exciter F
i
]
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4 l
4 4
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EA-FC-95-027 Rev. O Attachment 8.1 ,
DBA Sequence of Events to Define Off Normal Sequence Table 1-LBLOCA Coincident LOOP DG Governor Set at 900 RPM Table 2 LBLOCA followed by OPLS Due to a Loss of Offsite Power Actuated during HPSI Start DG Governor Set at 900 RPM Table 3 LBLOCA followed by OPLS Actuated during HPSI Start DG Governor Set at 900 RPM 1
Table 4 LBLOCA Coincident LOOP l l
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l
Table 1 Off Normal Respnse Time Line to Deliver HPSI Water to the Core to Meet USAR Section 14-15 Assumptions Time Delays Maximized LBLOCA Coincident LOOP DG Governor Set at 900 RPM Time into Event Description Discussion of Data LBLOCA Coincident LOOP T=0 sec. Event Starts Large Break LOCA T=1 sec. SIAS Setpoint Reached RCS Depresurizes 1 sec.
- Relay Actuation Delay 1 sec. (USAR delay from T=2 sec. SIAS Actuates-LOOP Assumed Here LOCA 0.97 sec.)
T=2 Sec. DG's Start to Full Speed SIAS Assume for DG Start
.6 secM.05 sec. hed May (cal T=5.15 sec. 480V Load Shed data)+0.5 decay (assumed original design)
. sec+2R sec. hed delay (cal T=6.16 sec. 4160V Load Shed data)+0.5 decay (assumed original design)
Govemor Left at full speed 8.2 sec from 8/24/95 T=10.2 sec. DG's Accelerate to Full Speed data 2 sec bounds AC-XX relay,1 sec setpoint from T=12.2 sec. DG's Breakers Close 161F597 sh. 8 First Load Group Sequencer Time Delay 3.5 sec.
! T=15.7 sec. HPSI Breaker Closes (test max limit) 1 T=18.7 sec. HPSI Pump Accelerates 3 sec Based on Test and Calc Data T=20.7 sec. HPSI Pipe Fill-HPSI to Core Begins Expected ECCS Performance T=31.57 sec. HPSI Required Delivery to the Core USAR Table 14.15-2 !
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I 10/2/951:15 PM Pagei DGLDSQUE.XLSDG Full Speed
Table 2 Off Normal Respnse Time Line to Deliver HPSI Water to the Core to Meet USAR Section 14-15 Assumptions Time Delays Maximized LBLOCA followed by OPLS Due to a Loss of Offsite Power Actuated during HPSI Start DG Governor Set at 900 RPM Time into Event Description Discussion of Data LBLOCA followed by LOOP during 1 HPSI Start T=0 sec. Event Starts Large Break LOCA T=1 sec. SIAS Setpoint Reached RCS Depresurizes 1 sec. (USAR .6 sec.)
ay Actuadon Delay 1 sec. WSM May fmm T=2 sec. SIAS Actuates LOCA 0.97 sec.)
T=2 Sec. DG's Start to Full Speed SIAS Assume for DG Start First Load Group Sequencer Time Delay 3.5 sec.
T=5.5 sec. HPSI Breaker Closes (test max limit) i T=5.5 sec. Offsite Power Lost Assumption for worst case HPSI Delay I oss oWoltage 2M sec (1.6 miay on 95%
T=7.1 Sec. DG Full Speed Signal Loss of Voltage curve +0.5 voltage decay)
I . se + . sec. hed delay + 0.5 sec T=8.65 sec. 480V Load Shed voltage decay I . sec+2.06 sec. M delay (cal T=9.66 sec. 4160V Load Shed data)+0.5 decay (assumed original design) wm r M at fuH speed 8.2 sec fmm 8/2N95 T=10.2 sec. DG's Accelerate to Full Speed data T=11.5 sec. (6 sec. OPLS Duplicates DG full speed Start 6 sec. used to bound OPLS Relays max delay of delay) and 4160V Load Shed 4.75 sec T=12.2 Sec. DG's Breakers Close 2 sec bounds AC-XX relay,1 sec setpoint First Load Group Sequencer Time Delay 3.5 sec.
T=15.7 Sec. HPSI Breaker Closes (test max limit)
T=19 Sec. HPSI Pump Accelerates Based on Test and Calc Data 3 Sec T=21 Sec. HPSI Pipe Fill-HPSI to Core Begins Expected ECCS Performance T=31.57 sec. HPSI Required Delivery to the Core USAR Table 14.15-2 .
10/2/951:15 PM Page 2 DGLDSQUE.XLSDG Full Speed
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Table 3 Off Normal Respnse Time Line to Deliver HPSI Water to the Core to Meet USAR Section 14-15 !
Assumptions Time Delays Maximized l LBLOCA followed by OPLS Actuated during HPSI Start DG Governor Set at 900 RPM i Time into Event Description Discussion of Data LBLOCA followed by OPLS Actuated during HPSI Start T=0 sec. Event Starts Large Break LOCA -
T=1 sec. SlAS Setpoint Reached RCS Depresurizes 1 sec. (USAR .6 sec.)
Relay Actuation Delay 1 sec. (USAR delay from T=2 sec. SIAS Actuates LOCA 0.97 sec.)
T=2 Sec. DG's Stari to Full Speed SIAS Assume for DG Start First Load Group Sequencer Time Delay 3.5 sec.
T=5.5 sec. HPSI Breaker Closes (test max limit)
OPLS Setpoint Reached Relay T=5.5 sec. Assumption for worst case HPSI Delay begins to time out Govemor Left at full speed 8.2 sec from 8/24/95 T=10.2 sec. DG,s Accelerate to Full Speed data T=115 sec. (6 sec' 6 sec. used to bound OPLS Relays max delay of OPLS Actuation - 4160V Load Shed delay) 4.75 sec T=13.5 Sec. DG's Breakers Close 2 sec bounds AC-XX relay,1 sec setpoint
~nremyr B
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Nhkk hkk h h hk hfkh h 10/2/951:15 PM Page 3 DGLDSQUE.XLSDG Full Speed -
Table 4 Normal Response Time Line to Deliver HPSI Water to the Core to Meet USAR Section 1415 Assumptions Time Delays Maximized LBLOCA Coincident LOOP Time into Event Description Discussion of Data LBLOCA Coincident LOOP i
T=0 sec. Event Starts Large Break LOCA T=1 sec. SlAS Setpoint Reached RCS Depresurizes 1 sec.
Relay Actuation Delay 1 sec. (USAR delay from T=2 sec. SIAS Actuates-LOOP Assumed Here LOCA 0.97 sec.)
T=2 Sec. DG's Start SlAS Assume for DG Start IAV Loss oWoRage 2.1 sec (1.6 relay on 95%
T=4.1 Sec. DG Full Speed Signal Loss of Voltage
- curve +0.5 voltage decay)
. sec+1.05 sec. M delay (cal T=5.15 sec. 480V Load Shed data)+0.5 decay (assumed original design) lAV UV 1.6 sec+2.06 sec. fixed delay (cal T=6.16 sec. 4160V Load Shed
, data)+0.5 decay (assumed original design) 10 Second Start Ready to Load at Voltage based T=12 sec. DG's Accelerate to Full Speed on surviellance criteria sec Munds AC-M miay,1 see setpoint kom T=14 sec. DG's Breakers Close 161F597 sh. 8 First Load Group Sequencer Time Delay 3.5 sec.
T=17.5 sec. HPSI Breaker Closes (test max limit)
T=20.5 sec. HPSI Pump Accelerates Based on Test and Calc Data T=22.5 sec. HPSI Pipe Fill-HPSI to Core Begins Expected ECCS Performance T=31.67 sec. HPSI Required Delivery to the Core USAR Table 14.16-2 l
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10/2/951:15 PM Page 4 DGLDSQUE.XLSDG Full Speed 1
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l EA-FC-95-027 Rev. 0 Attachment 8.2 480V IAV Relays Setting and Voltage vs Time Curve i
I 1
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IAV Relay Setting Evaluation The basis for the IAV Undervoltage Relay settings are provided in EA-FC-93-027 Loss of Voltage IAV Relay Setooints. The IAV relay setpoints are designed to prevent motor winding accelerated aging damage in the event of low bus voltage. Low bus voltages will cause high motor currents.
To determine the IAV trip time the actual bus voltage must be scaled to the IAV relay 100% voltage setpoint. This is accomplished through a series of steps to scale 480V bus voltage to Percent Voltage Required to Close the Right Contact. The IAV right contact is the undervoltage contact used at FCS for equipment protection. The left contact is the overvoltage contact use at FCS for annunciation.
The 480V bus voltage is first divided by the potential transformer ratio to obtain the IAV relay input voltage. The 480V load center PT ratio is 480V to 120V or 4 to 1. The IAV input voltage is then divided by the 100% IAV voltage setpoint. From EA-FC-93-027 the setpoint selected is 94 volts. At this voltage the IAV relay will not trip. After the percent IAV relay voltage is found the relay curve (next page) is used to determine the trip time. The FCS relays are adjusted to their most sensitive curve setting of 95%.
On a total loss of voltage the relay will trip in 1.2 seconds (bounding value . ) The second curve attached to this discussion provides a direct relation of IAV relay trip time plus the 1 second fixed Agastat relay to the 480V bus voltage in percent of 480V. .
The relay trip curves are only valid for decreasing voltage. In the case where voltage is increasing as the Diesel Generator energizes the bus, the relay resets only after the voltage has increase above the nominal 100% level. 1 l
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EA-FC-95-027 Rev. 0
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4.
Attachment 8.3 i
Sequence of Events for:
. Table 1- Expected Normal Response to a DBA-OPLS-DG ESF Loading Table 2 Off Normal Response Sequence Loading including expected 480V Load Center Load Shed Table 3 Comparison of the Sequence of Events for the Expected Response and the Off Normal Response Sequence Loading 2
4 0
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i Table 1 EA-FC-95-027 Diesel Generator Offnormal Loading Due to a Full Speed Start Expected ResponseTime Line to Have Full ESF in Operation Maximizing DG-1 Load, Time Delays Nominal LBLOCA followed by OPLS Actuation During VA-7C Start Time into Event -
LBLOCA followed by Description Discussion of Data OPLS Actuation I T=0 sec. Event Starts Large Break LOCA T=1 sec. SlAS Setpoint Reached RCS Depresurizes 1 sec. (USAR .6 sec.)
el y A ua n e ay 1 sec. (USM delay T=2 sec. SIAS Actuates from LOCA 0.97 sec.)
T=2 Sec. DG's Start SIAS Assume for DG Start T=5 sec. DG's Accelerate to Idle 3 sec estimation-not a entical value Load Group 1,3 sec. SI-IA, AC-10A, SI-2A, T=5 0 see to T=48
^' Nominal Load Grou Times from OP-ST-sequh e n o AC-3C Load oup 3,18 s . AC 10C V e
3A, Load Group 4,31 sec. FW-6, SI-3A, Load Group 5,48 sec. VA-7C f
OPLS Setpoint Reached Relay begins to Assumption for After Start of th6 Last ESF T=50 sec' time out Load VA-7C T=54.5 sec. (4.5 sec. OPLS Actuation-DG Full Speed Signal, OPLS Relays calibration setpoint delay) 4160V Load Shed 3
T=56.7 sec. 480V Load Shed IAV UV 1.2 sec + 1 sec. fixed delay =2.2 sec.
T=62.5 Sec. DG's Accelerate to Full Speed 8 sec. from OPLS used from ESF Testing T=63.5 Sec. DG's Breakers Close AC-XX relay,1 sec setpoint T=63.5 sec. First Load Group Sequencers Operate 3 0 sec. maximum time delay l T=71.5 Sec. Second Load Group Sequencers Operate 8 sec. nominal maximum time delay T=81.5 Sec. Third Load Group Sequencers Operate 18 sec. nominal time delay T=94.5 Sec. Fourth Load Group Sequencers Operate 31 sec. nominal time delay T=111.5 Sec. Fifth Load Group Sequencers Operate 48 sec. nominal time delay 1
10/2/954:34 PM Page1 DGLDSQUE.XLSDG Analysis Nom
Table 2 EA-FC-95-027 Diese; Generator Offnormal Loading Due to a Full Speed Start
- Off Normal Response Time Line to Have Full ESF in Operation Maximizing DG-1 Load. Time Delays Nominal LBLOCA followed by OPLS Actuation Dunng VA-7C Start DG Governor Set at 900 RPM Time into Event -
LBLOCA followed by Description Discussion of Data OPLS Actuation T=0 sec. Event Starts Large Break LOCA T=1 sec. SIAS Setpoint Reached RCS Depresunzes 1 sec. (USAR .6 sec.)
T=2 sec. SlAS Actuates elay AcNadon Delay 1 sec. NSM delay from LOCA 0.97 sec.)
T=2 Sec. DG's Start SIAS Assume for DG Start Load Group 1,3 sec. Sl 1 A, AC-10A, SI-2A, T=5 0 see to T=48 AC-3C Load oup 3,18 ec. AC 10C seqube se E F 0002 3A, Load Group 4,31 sec. FW-6, SI-3A, power Load Group 5,48 sec. VA-7C Govemor Left at full speed 8.2 see from T=10.2 sec. DG's Accelerate to Full Speed 8/24/95 data OPLS Setpoint Reached Relay begins to Assumption for After Start of the Last ESF T=50 sec' time out Load VA-7C
= sec 5 sec.
OPLS Actuation - 4160V Load Shed Of LS Relays calibration setpoint T=55.5 Sec. DG's Breakers Close AC-XX relay,1 see setpoint T=56.7 sec. 480V Load Shed lAV UV 1.2 sec + 1 sec. fixed delay =2.2 sec.
Load Group 1,3 sec. SI-1 A, AC-10A, SI-2A, T=58.5 sec. 3.0 sec. maximum time delay AC-3A T=63.5 Sec. Load Group 2,8 sec. SI-2C, CH-1 A, AC-3C 8 sec. nominal maximum time delay T=73.5 Sec. Load Group 3,18 sec. AC-10C, VA-3A
, 18 sec. nominal time delay j T=86.5 Sec. Load Group 4, 31 sec. FW 6, SI-3A 31 sec. nominal time delay T=103.5 Sec. Load Group 5,48 sec. VA-7C 48 sec. nominal time delay off normal i
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10/2/954:34 PM Page 2 DGLDSQUE.XLSDG Analysis Nom
Table 3 EA-FC-95-027 Diesel Generator Offnormal Loading Due to a Full Speed Start Expected ResponseTirne Line to Have Fuu ESF in Operation Maximizing DG-1 Load, Off Normal Response Time Line to Have Fuu ESF in Operation Maximizing DG-1 Load.
Time Delays Nominal Time Delays Nominal LBLOCA foBowed by OPLS Actuation Dunng VA-7C Start LBLOCA foRowed by OPLS Actuation During VA-7C Start DG Govemor Set at 900 RPM Time into Time into Event - Event -
LBLOCA LBLOCA Description Discussion of Data Description Dscuss on of Data foBowed by foHowed by OPLS OPLS Actuation Actuation
_T=0 sec. Event Starts Large Break LOCA T=0 sec. Event Starts Large Break LOCA T=1 sec. SIAS Setpoint Reached RCS Depresunzes 1 sec. (USAR T=1 sec. SIAS Setpoint Reached *P'**""#** ** ^
.6 sec.) .6 sec.)
Relay Actuation Delay 1 sec. Relay Actuation Delay 1 sec.
T=2 sec. SIAS Actuates (USAR delay from LOCA 0.97 T=2 sec. SIAS Actuates (USAR delay from LOCA 0.97 sec.) sec.)
T=2 Sec. DG's Start SIAS Assume for DG Sta:t T=2 Sec. DG's Start SIAS Assume for DG Start T=5 sec. DG's Accelerate to idle 3 sec estimation-not a critical value lis$sg;jlgsg%si e#M@pggeggfd E85dEMM h d@lE$$$h M e Load Group 1,3 sec. SI-1 A, AC- Load Group 1,3 sec. SI-1 A, AC-T=5.0 sec. to 10A, SI-2A, AC-3A Load Group T=5.0 sec. to 10A, SI-2A, AC-3A Load Group T=48 sec. ESF 2,8 sec. SI-2C, CH-1 A, AC-3C = se . S sec. H-1 A, AC-3C Nominal Load Group Times from , ,
Nominal Load Group Times from Loads Load Group 3,18 sec. AC-10C, L ads Load Group 3,18 sec. AC-10C, OP-ST-ESF-0002 OP-ST-ESF-0002 sequence on VA-3A, Load Group 4,31 sec. sequence on VA-3A, Load Group 4,31 sec.
cffsite power FW-6, SI-3A, Load Group 5,48 offsite power FW-6, SI-3A, Load Group 5,48 sec. VA-7C sec. VA-7C Gov Left at fus speed 82 see T=10.2 sec. DG's Accelerate to Fut Speed
[
OPLS Setpoint Reached Relay Assumption for After Start of the OPLS Setpoint Reached Relay Assumption for After Start of the T=50 sec. " **
begos to time out Last ESF Load VA-7C begins to time out Last ESF Load VA-7C
= 4.5 m. T=54.5 sec.
OPLS Actuation-DG Fut Speed OPLS Actuation - 4160V Load
- Y' * * . " ** E *
(4.5 m . Signal,4160V Load Shed I* ' *' S ays cahabon sew Shed delag delay)
$$iSB@@ M B BMsMin n M W M M JIM E M E @usdEEsh&gMEEdessif#seng T=55.5 Sec. ; DG's Breakers Close i AC-XX relay,1 see setpoint IAV UV 12 sec + 1 sec. fixed delay 12 sec + 1 m. hed My T=56.7 sec. 480V Load Shed -_T=56.7 sec. : 480V Load Shed
=2.2 sec. _ . _ _ _
. . . . . . =2.2 sec.
at
.0 m. mdmurn Sme delay T=62.5 Sec. DG's Accelerate to Fut Speed .
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10/2/95429 PM Page1 DGLDSQUE.XLSDG Analysis C-Non
Table 3 EA-FC-95-027 Diesel Generator Offnormal Loadog Due to a Fus Speed Start Expected ResponseTime Line to Haw Ft.;ESF in Operation Maximizing DG-1 Load, Off Normal Response Time Line to Have fur ESF in Operation Maximizog DG-1 Load.
Time Dew,3 Nominal Time Delays Nominal LBLOCA foRowed by OPLS Actuation Dunng VA-7C Start DG Governor Set at 900 LBLOCA fogowed by OPLS Actuation During VA-7C Start RPM Time into Time into Event - Event -
LBLOCA . LBLOCA Desenption Discussion of Data Description Discussion of Data foHowed by foGowed by OPLS OPLS Actuation Actuation T=63.5 Sec. DG.s Breakers Close AC-XX relay,1 sec setpo.tn t Second Load Group Sequencers 8 sec. nominal maximum time T=63.5 Sec.
Operate delay First Load Group Sequencers P EFT M WW"sW~timpaqe aN EWrwE T=63.5 sec. 3.0 sec. maximum time delay "au";g gg%sW;i m;r Jig pg.M; g ampbMe:na;. E W;Nig!g4 fN 5j.' P . u m#mL Operate :._ 3 ;~g. y ~7.;;pp=gyg a 9gg y g. y pqi u , gag Second Load Group Sequencers 8 sec. nominal maximum time wy een m ~. meAan "mm24 nach:
-%eraw arpmgr p~er^ 1- m r '
T=71.5 Sec.
Operate _.
dela y.w s ap agan x gm3;ggg;g .wg M m!qgggg g ;jgg;g;;g s
csee v " 's' 7- aw;r g"g.e i tg* #r x.>
ggg.gga i@C; > @; -.
.d$hesh;;gs98 4 3cggig tag M J8__ g ga;g"T7?ggg4,
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.. m d a m a@g g;aga + pp:43p.jpgi T=73.5 Sec.
,. at 4 -
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7 -
n samus qameggm Operate 18 sec. nominal time delay T=81.5 Sec.
Third Load Group Sequencers 18 sec. nominal time delay NMT "iNM ..sg Mght hes (fpMp6 gn skig!N pqp "^"WjgAbm.FW:q tytga 4 R ^m .MPM Operate no m ggggg .fgggg qa /an,zygg j g g g:ggg g; tan.,s
- aw m ggg-
,ge. Q . Of 7 PB f5I Md T 86.5 Sec.
Fourth Load Group Sequencers T i b i $e g. Sup& g%ggy%@SWEE gggg . Wii. @Ag@w((Mi'HL ga a A@*M@wwgggg;; d gggg hOperate g a mp - a -
31 sec. nominal time delay pgsigjj!gg ;g jeG a M u ws go a maa h" m :mr hgg m g
=m rwm esw bi Fourth Load Group Sequencers i W P!P T=94.5 Sec. 31 sec. nominal time delay g%p% M7 "Mi A3 @py@g g$gpwa@fg un g"_gg g gg ggg+gumgqpsM4lp5w;9 r6:
3 g;gh g e.d ggg%
s sm w
Operate
..m .*?!N*MeFMgg 2 ....we.w. w gat ggggg; j .
Fifth Load G equencers y hhg .g.sh. --- w.e. .. ,hhh e.m:wh. f hffff f f:s. T=103.5 Sec. 48 sec. nominal time delay Fifth Load Group Sequencers c esspa To111.5 Sec. Operate 48 sec. nominal time delay < qv-a rFO Md.4gpeqqpge); igg gggg.py gggg %grpm 'sgg.gg::s@me s.
i Not Applicable TimesW Autume%"
- M es at$ Off Normal Sequence Times 10/2/954:29 PM Page 2 DGLDSQUE.XLSDG Analysis C-Non
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Equipment Operating Data 4
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CA-1A Tune l l l~ ~Uf35 CA-1C Off, to sta-1by Trne 0300 0310 ._-
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d Location: FORT CALHOUN STATION Project #: .8031 Date: 09 30-1995 Engineers STONs & WE85TER ENGRG CORP Study Case #: FCSDG1T4
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2 Data Filenames FCSDG1T4 Plot Filenames FCSOG174 1
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] Location: FORT CALHOUN STATION
- Project # .8031 Date: 09 30 1995 1 Engineer STONE & WEBSTER ENGWG CORP Study case #: FCS0G174 l'
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l Data Filenames FCSDG174 Plot Filenames FCSDGIT4 i s 1 Bus # 71: BUS 183C '
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, eedeeeeeeeeeeeeeeeeeeeeee Project: OPPD ETAP 6.5 Page:
Locationt FORT CALHOUN STATION Project #: .8031 Date: 09 30 1995 Engineers STONE & WEBSTER ENGRG CORP Study Case #: FCSDG1T4 44&&&&&444&&&&446&&&&&&&&&&4444444444446&&&444444444444&&&&&&&&&444444&&&&d&444&&&&&&&6&&d4444&&&&&&&&&&&&&&&&&d&&&d44444446&&&&&&&&
DG 1 LOADING TRANSIENT ANALYSi$
- W/0 480 LOAD SHED EA FC 95 027 DEAD LOAD /480V ESF LOADS /CA 1A/FW 8A G T=0 sec & UNDERVOLTAGE LOAD SHED G T=1.2 see Attachment 8.6 eeeeeeeeeeeeeeeeeeeeteneeeeeeeeeeeeeeeeeeeeeeeeeeeee6deetedeeeeeedeeeeeeeseeeeeeeeeeeeeeeeseeeeeesseeeeeeeeeeeeseseeseees6teeeeeeeee Data Filenames FCSDG174 Plot Filenames FCSDG174
, Induction Motor # 928: $1 1A t
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Location: FORT CALHOUN STAfl0N Project #1 .8031 Date: 09 30 1995 Engineers STONE & WEBSTER ENGRG CORP Study Case #: FCSDG1T4
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DG 1 LOADING TRANSIENT ANALYSIS
- W/0 480 LOAD 5HED EA FC 95 027 DEAD LOAD /480V ESF LOADS /CA 1A/FW 8A G T=0 sec & UNDERVOLTAGE LOAD SHED G T=1.2 see Attachment 8.6 eeeseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeedeeeesdeeeeeseeeeeeeeeeeeeeeeeeseeediedeeeeeeeesse666eseeeeedeessieteeseeeeeeeeeeeeeeeeee Data Filenames FCSDG174 Plot Filenames FCSDG1T4 l Induction Motor # 928: S! 1A l
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TRANSIENT STABILifY PL0f5
. eeeeeeeeeeeeeeeeeeeeeeeee l Project OPPD ETAP 6.5 Page: '
Location: FORT CALHOUN STAi!ON l Project #: .8031 Date: 09 30 1995 Engineer: STONE & WEBSTER ENGRG CORP Study Case #: FCSDGIT4 ,
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, DEAD LOAD /480V ESF LOA 05/CA 1A/FW 8A a f=0 sec & UNDERv01.TAGE LOAD SHED G T=1.2 sec Attachment 8.6
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- 6.5 Page:
Location: FORT CALHOUN STATION Project #: .8031 Date: 09-30-1995 Engineer STONE & WEBSTER ENGRG CORP Study Case #: FCSDG1T4 4666b666666666666666666666666666666666666666666b666666b6666666666666666666666666666666666666666bbbbbbbbbbbbbbbbbibbbbbbbbbbbbbbibbib DG 1 LOADING TRANSIENT ANALYSIS - W/0 480 LOAD SHED EA FC 95-027 DEAD LOAD /480V ESF LOADS /CA 1A/FW 8A a T=0 sec & UNDERVOLTAGE LOAD SHED a T=1.2 see Attachment 8.6 eeddeeeeeeeeeeeeeeeeeeeeeeeeeeeeseeeeeeeeeeeeeeeeeeseeeeeeeeeeeeeeeeeeeseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeseeeeeeeeeeteeeeeeeeeeeede Data filename: FCSCGif4 Plot Filename: FCSDG1T4 Induction Motor # 915: AC 3A l
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Miscellaneous Input Data l I
OP-ST-ESF-0002 Diesel Generator No. 1 and Diesel Generator No. 2 Auto Operation Excerpt
< ERF' Archival Dump DG-1 Voltage Voltage Point Y3257 Reactor Trip at 11:15 August 24, 1995 DG-1 Time to Full Speed Estimate
< l 4
IAV and Fixed Delay 4160V and 480V Calibration Procedures (typical) Excerpts SP-CP-08-1A3-IAV j SP-CP-(8-480-1B3A-4A l
} USAR Table 14.15-2 Large Break LOCA Sequence of Events )
l
- SP-CP-08-DEVAR-1A3.OPLS time delay Excerpt Gould Shawmut Amp-trap Fuse Data A25X100 OP-ST-ESF-0009 Channel "A" Safety Injection, Concainment Spray l and Recirculation Actuation Signal Test Excerpt i
DG-1 Auto Operation Plot from EA-FC-92-072 Excerpt 4
l 4
I 1
FORT CALHOUN STATION OP-ST-ESF-0002
. SURVEILLANCE TEST PAGE 25 OF 99 Test Coordinator in the Control Room INITIALS 7.34 Verify the following equipment received an Auto Start Signal AND record the sequence values.
Computer Computer Number Set Point Point Time SI-1A 2.0 to 3.5 sec. D1084 AC-10A 2.0 to 3.5 sec. D1023 SI-2A 2.0 to 3.5 sec. D1020 AC-3A 2.0 to 3.5 sec. D1024 SI-2C 7.5 to 11.0 sec. D1015 CH-1A 7.5 to 11,0 sec. D1019 AC-3C 7.5 to 11.0 sec. D1022 AC-10C 15.0 to 21.0 sec. D1021 VA-3A 15.0 to 21.0 sec. D1026 FW-6 28.5 to 33.5 sec. D1028 SI-3A 28.5 to 33.5 sec. D1025 VA-7C 44.0 to 50.0 sec. D1027 I
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- 1. 0,0,0 200-949__ 8/24/1995 j11 13:43 :8/24/1995 11:16:46 of ,
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FORT CALHOUN STATION SP-CP-08-1A3-IAV CALIBRATION PROCEDURE PAGE 23 OF 25 i
CALIBRATION OF THE OVER AND UNDERVOLTAGE IAV RELAYS AND AGASTATS LOCATED IN BUS 1A3 CONTROL CIRCUIT Page 4 of 6 Steps 7.2 through 7.7: IAV53 Relays
. l 27-1/1A3 PU V.. DO V. DO DO and TAP LEFT RT. TIME TIME TEST 27.-2/1A3 CONT CONT SEC. VOLTAGE OPT 93 98.00 93.00 s 5.9 118-87VAC SETTINGS MIN N/A 96.10 91.28 4.0 N/A ISSUED MAX N/A 99.66 94.84 5.9 N/A OPPD AF 118-87VAC
- 89 27-2 AL 118-87VAC TEST EOUIP NAME: ID NUMBER CERT DATE DUE DATE i
(relay tested by) (date)
R1
1 FORT-CALHOUN STATION SP-CP-08-1A3-IAV CALIBRATION PROCEDURE PAGE 24 OF 25 CALIBRATION OF THE OVER AND UNDERVOLTAGE IAV RELAYS AND AGASTATS LOCATED IN BUS 1A3 CONTROL CIRCUIT Page 5 of 6 i
Steps 7.8 through 7.15: Test of Agastats 27T1/1A3 TIME PU AND DIAL TIME 27T2/1A3 SEC .
OPT 2.0
- : INFORMATION ONLY TEST EOUIP NAME: ID NUMBER CERT DATE DUE DATE (relay tested by) (date) d G
R1
SP-CP-08-480-1B3A-4A i
FORT CALHOUN STATION CALIBRATION PROCEDURE PAGE 21 OF 22 l CALIBRATION OF THE PROTECTIVE RELAYS FOR 480-1B3A-4A BUS Page 4 of 5
- dtops 7.2 through 7.7 27-1/1B3A-4A PU V. DO V. DO DO DO DO and LEFT RT. TIME TIME TEST TIME TIME TEST
]i 27-2/183A-4A TAP CONT CONT SEC. VOLTAGE SEC. VOLTAGE
\
- SETTINGS OPT 93 94.00 89.30 7.0 115-84VAC 1.2 115-0VAC i ISSUED 1 MIN N/A 93.5 88.8 4.5 N/A 0.4 N/A 1
- MAX N/A 94.5 89.8 9.5 N/A 2.0 N/A f
l OPPD AF 115-84VAC 115-0VAC I # 122 115-84VAC 115-OVAC 27-1 AL i
]
I OPPD AF 115-84VAC 115-OVAC l # 123 115-84VAC 115-0VAC
! 27-2 AL
! TEST EOUIP NAME: ID NUMBER CERT DATE DUE DATE i
I 4
l I
i (relay rested by) (date)
Steps: TIME PU l TIME i 7.8 27T1/133A-4A DIAL i through SEC 7.11 OPT 1.0
- 1.00 SETTINGS MIN N/A .95 f' ISSUED MAX N/A 1.05 l'
- : INFORMATION ONLY TEST EOUIP NAME: ID NUMBER CERT DATE DUE DATE
,1 1
1 1
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(relay tested by) (date)
FC/SP-CP/05A R5
. FORT CALHOUN STATION SP-CP-08-1A3-IAV CALIBRATION PROCEDURE PAGE 24 OF 25 CALIBRATION OF THE OVER AND UNDERVOLTAGE IAV RELAYS AND AGASTATS LOCATED IN BUS 1A3 CONTROL CIRCUIT Page 5 of 6 Steps 7.8 through 7.15: Test of Agastats 27T1/1A3 TIME PU AND DIAL TIME c 27T2/1A3 SEC OPT 2.0
- : INFORMATION ONLY TEST EOUIP NAME: ID NUMBER CERT DATE DUE DATE B
(relay tested by) (date) 4 i
R1
TABLE 14.15-2 FORT CALHOUN LARGE BREAX LOCA ANALYSIS LARGE BREAK SE00ENCE OF EVENTS MIN SI FLOW MIN SI FLOW MIN SI FLOW F', = 1.75 F', = 1.75 F', = 1.75 RESULTS DECLG Cm=0.4 DECLG Cm=0.6 DECLG Cm=0.8 Start 0.0 0.0 0.0 Rx Trip Signal 0.60 0.59 0.59 S.I. Actuation Signal 0.97 0.77 0.67 S.I. Tank Injection 22.80 16.80 14.00 Pump Injection Begins 31.87 31.67 -31.57 End of Bypass 28.92 20.59 17.48 End of Blowdown 28.92 20.59 17.48 Bottom of Core Recovery 39.34 31.73 28.52 S.I. Tanks Empty 94.92 90.14 88.01 Note: All times are in seconds.
TABLE 14.15-3 FORT CALHOUN LARGE BREAK LOCA ANALYSIS BREAK SPECTRUM SENSITIVITY ANALYSIS RESULTS f
M)NSIFLOW F , = 1.75 MJ,NSIFLOW MJ,NSIFLOW F = 1.75 F = 1.75 RESULTS DECLG C =0.4 DECLG C =0.6 DECLG C =0.8 I
i Peak Clad Temperature (*F) 1981. 1869. 1815. l 1
Peak Clad Temp. Elevation (Ft.) 9.25 9.25 9.25 l Peak Clad Temperature Time (Sec.) 113.9 98.3 86.8 Max Local Zr/H 2O Reaction (%) 2.98 2.88 2.38 Total Zr/H,0 Reaction (%) <l.0 <l.0 <1.0 Hot Assy. Burst Time (Sec.) 47.4 69.5 61.1
- Hot Assy. Burst Elevation (Ft.)- 8.75 9.00 8.75
! Blockage on Hot Rod (%) 41.0 35.2 38.8
, 14.15-8 R3 7/92 i .
)
)
FORT CALHOUN STATION SP-CP-08-DEVAR-1A3 CALIBRATION PROCEDURE PAGE 23 OF 24 CALIBRATION OF THE DEVAR RELAY AND ASSOCIATED TIMERS FOR BUS 1A3 l
Page 5 of 6 Steps 7.5 Test of Agastat'27T1/OPLS-A TIME DO l 27T1/OPLS-A DIAL TIME SEC OPT
- : INFORMATION ONLY TEST EOUIP NAME: ID NUMBER CERT DATE DUE DATE i
(relay tested by) (date) d R7
A FORT CALHOUN STATION SP-CP-08-DEVAR-1A3 CALIBRATION PROCEDURE PAGE 22 OF 24 CALIBRATION OF THE DEVAR RELAY A?O ASSOCIATED TIMERS FOR BUS 1A3 Page 4 of 6 Steps 7.1 thru 7.3 Test of Devar Relay .27-74/1A3 INTERNAL INTERNAL 27-74/1A3 Relay Relay OPPD NO. 3 Al A2 ,
1 OPT 114.61 114.61 SETTINGS ,
ISSUED MIN 113.97 113.97 1 MAX 115.25 115.25 AC AF VOLTS AL ;
Steps 7.4 Test of Agastat 27T1X/OPLS-A ,
I l
TIME DO 27T12/OPLS-a DIAL TIME OPPD NO. 3 SEC OPT
- 10 15.0 SETTINGS MIN N/A 14.5
, ISSUED MAX N/A 15.5 l
- : INFORMATION ONLY
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600Lp INc/ GOULD SHAWMUT 59E D E 4055570 0002889 2b2 m
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Amp-trap *-Form 101 Semiconductor Protection Fuses A13X/A25X/A50P/A50QS A60X/A70P/A700/A100P For Semiconductor Protection ;
Extremely Fast Acting Current Limiting 130,250,500,600, ,
700 and 1000 Volts AC l 1 to 6000 Amperes Low I't Controlled Arc Voltage Blown Fuse Indicator Available Many are UL Recognized l l
l Catalog Number Explanation A 70 p 4oo 4 y:
Amp trap Form 101 fuses are extremely fast acting fuses which provide protection for diodes, '*' ,l thyristors, tnacs and other solid state components Ep.7r pNusu AF l
and devices. Though intended primanly for short
, circuit protection, most Form 101 fuses provide a
' Rsted Vol _ Sty W c degree of overload protection Jigainst currents of approximately 2 times fuse ampere rating and 250 x,z 25 l
l greater. The melting time current curves for yP,os 50 these fuses show the range of overload currents 600 - x. 2 60 l
j over which these fuses will effectively operate. y - Q j.2 1N Supplementary overload protection such as gate 1200 P, x. 2 120 i
1500 - P, X. Z 150 l pulse suppression should be employed to interrupt l current levels below those shown on the fuse melting time current curves, l
j Proper fuse selection is an integral and important stgle gdg l
, part of the equipment design process. For Faster. Lower l e t p assistance in fuse selection request tne Gould Fastest. Lowest i e t Q or QS Shawmut publication " Semiconductor Fuse Arnpern Rahg in Amperes l Applications". This publication has been wotlen for the designer and discusses in depth the common Mounting Types
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parameters involved in the selection of fuses for ge -
1 semiconductor protection. i w x ,y, ) 2 In addition to the products shown here. Gould HNy'Nbolt in 128 I
offers standard Form 101 fuses with voltage ratings Integral Blown-Fuse Indicator to 1500 VAC. We maintain the capability of Trigger inemator Ti Trigger Actuster TA developing custom designs for those applications not adequately served by our standard products
- For ampere ra:Ings and styles not listed, consult the factory.
For Form 101 Amp Trap fuse accessones and fuse blocks, see pages 161 and 162.
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Single Pole Fuse Blocks' For A25X Fuses FUSE FUSE BLOCK AMPERE CATALOG RATING NUMBER 1-30 20306 31-60 P243G 61 100 P243 101 200 P243 201 400 P243G 401-600 P243G
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2 A25X35 60 4 3W 'b 1% 2% 2% % -
3 A25X70-200 4 3% 1 1% 2W 2W W 1 W -
3 A25X225 700 4 38 1% 1% 2% 2 % 1 % - i 3 A25X800 4 32N 2 1% 2% 2W % 1% % -
2% 2% 1% %-24 % Deep 4 A25X800-1200 128 2% 3 - - -
% 24-% Deep 5 A25X1500 2500 128 2% 3% 2% 3 1% 1% - -
2% 4% 2% 3% 1% 1% - - % 20-% Deep 5 A25X3000 4500 128
-Standard Fuse Ampere Ratings' For A25X Fuses MOUNTING AMPERE MOUNTINO AMPERE MOUNTING AMPERE TYPE RATING TYPE RATING TYPE RATING 1 50 4 500 4 1
60 4 52 4 2 1 70 4 600 4, 4TA. 4T1 3 1 4 1 80 4 700 4.128 00 4 800 4,4TA,128 5 1 100 4,4Ti 1000 128,12BTI (
8 1 125 4 1200 128 7 1 130 4 1500 128 8 1 150 4. 4Ti 1600 128 9 1 175 4 2000 128 10 1 12 1 200 4,4Tl 2500 128 15 1 225 4 3000 128 20 1 250 4, 4Ti 3500 128 25 1 300 4.4TI 4000 128 350 4 4500 128 30 1 35 4 400 4. 4TA. 4Ti 4 450 4 40
- Includes standard ampere ratings and rnounting types available in eacn ampere rating.
GOULD IMC/Cout.9 SHAUMUT DIY
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EA-FC-95-027 Rev. 0 Attachment 8.8 G.E. Letter E.I. Hersh to Bob Mehaffey 8/15/78 Diesel Generator Exciter I
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SERVICE ENGINEERING GENERAL ELECTRIC COMPANY 8401 WEST DOCGE RCAD, SUITE 210 DEPARTMENT P.O. 80X 14210. OMAHA. NEBRASKA 68114 79ene (402) 337 4500 ,
August 15, 1978 DIESEL GENERATOR EXCITER, Mr. Bob Mehaffey Omaha Public Power District Fort Calhoun Nuclear Station Fort Calhoun, Nebraska 68025
Dear Bob:
On 3/9/78 the above exciter f ailed again under what we believe to be "similar conditions". On my arrival, the situation was discussed witn our Product Design Engineer, Mr. Paul Luck in Salem, Virginia. The following was established:
- 1. The exciter rating is 100A, 117 volts.
- 2. One minute rating is 149A, 175 volts.
- 3. Operation above Item #2 over a longer period of time could produce blowing of fuses in the SCR circuit (100A).
Our next task was to operate the diesel, af ter the newly installed feference zener was exchanged. The following points were mentioned:
- 2. Field voltage.
- 3. Regulator voltage (point 60-61).
- 4. Current across 220 ohm resistor in series with reference zener.
The equipment was operated in parallel with the system for two hours loaded to 2500 KW P.F. of .9 voltage of 4160 to 4170V and 380A. KVAR's within 800 to 1050 range.
All of the monitored points showed satisf actory readings with the .
field current at 80 amp level and field voltage of 95 to 105V level. !
. Oscilloscope observations across the field and across the SCR's
, produced normal patterns.
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2-Mr. Bob Mehaffey August 15, 1978
.Our next task was.to examine the computer trend readouts from prior operation that produced a failure.- The following was ,
establi.shed: .
a) Frior to paralleling of the diesel, the bus voltage was 4155 volts.
b) on closing the diesel breaker, the bus voltage went up to 4174 and the generator loaded up to 1347 KVAR's (lagging) 314A and 1300KW.
'From then on the operation (see attached graph) exhibited a rising characteristic and 50 minutes into the run a fuse blew in the SCR circuit. At that time the last computer reading showed 2051 KVAR, 445 A, 2436 KW and 4186 bus volts. There was no correction made by the operator. To estimate the actual exciter current output, it would be necessary to examine the generator saturation curve or re-duplicate the above condition with a shunt in the field circuit.
In summary, we do not believe that the newly installed zener corrected the situation. The. exciter should exhibit drooping characteristics with load. Therefore, the following is suggested at the time of the next runs a) ' Reinstall the shunt and monitor field current voltage.
b) After' loading the generator to some load (KW) with about 250 to 300 amps output, momentarily short the droop C.T., the observed field current and output amps should increase. Should there be no change in the current, we could suspect the C.T. current and ratio should be verified with a clamp on the meter. Also recheck the droop circuit.
If all tests show correct compensation, it could be desirable to increase.the droop compensation taps on the droop transformer (after a shutdown). j Also,. Mr. Paul Luck suggested that the max. excitation limit could be energized (i.e. placed in the circuit) by a delay timer !
(30 seconds to one minute after initial black start) and then set to limit'the exciter output to 120 to 125%, i.e. field current.
GENER AL @ ELECTRIC Mr. Bob Mehaffey August 15, 1978 Should you have any questions, do not hesitate to call.
Yours truly f~.0 $,
E. I. HERSH AREA ENGINEER EIH/mim P.S. The voltage ripple between points 60-61 was calculated in Salem to be normal at one volt. If larger, the series choke should be checked.
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