ML20155A654
| ML20155A654 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/28/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8810060033 | |
| Download: ML20155A654 (4) | |
Text
f-4 TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 37401 5N 1578 Lookout Place SEP 281988 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Hashington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - COMPARISON OF THE SQN DIESEL GENERATOR LOAD ANALYSIS (DGLA) RESULTS This letter provides NRC with the information that was requested during a telephone conversation on September 21, 1988, regarding the results of the SQN DGLA (SQN-E3-002) that was issued as part of the unit I restart effort. The specific Informatica requested was for TVA to provide a graphical comparison of the DGLA results obtained for the unit I restart effort (SQN-E3-002, revision 10) versus those obtained by TVA during the unit 2 restart effort (SQN-E3-002, revision 7).
NRC also requested that TVA provide a litt of the major differences between wese two revisions with respect to the methods usea to determine the diesel generator (DG) load.
The enclosure provides a graphical comparison of the maximum loading for the heaviest loaded DG (i.e., DG 28-B).
This comparison shows that the maximum loading calculated for unit I restart (in support of two-unit operation) is bounded by that previously calculated for unit 2 restart.
The enclosure also provides a list of the major differences between revision 7 and revision 10 of the DGLA.
No commitments are made by this letter.
Please direct questions concerning this issue to B. A. Kimsey at (615) 870-6847.
Very truly yours, TENNESSEE VALLEY AUTHORITY V
kn Nuclear'y, Manage 7 f R.l Grid, Licensing and Regulatory Affairs Enclosure cc:
See page 2 o
8810060033 000920
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PDR ADCCK 05o00327 P
PNU i
An Equal Opportunity Employer l
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. ((.S.NuclearRegulatoryCommission
$[f jg jggg cc (Enclosure):
Ms. S. C. Black, Assistant 0) rector forProjects TVA Projects Division U.S. Nuclear Regulatory Cun.91ssion One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant Director for Inspection Programs TVA Projects Olvision U.S. Nuclear Regulatory Comission Region II
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101 Marietta Strset, NW, Sulte 2900 Atlanta, Georgia 30323 i
Sequoyah Resloent Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road l
Soddy Daisy, Tennessee 37379 i
ENCLOSURE Comparison of the SON DGLA Results ENGINE LOAD kilowatts (kW) 5000 -
4968 LEGEND 4900 -
(2)
= Unit 2 Restart (SON-E3-002, R7)
= Unit 1 Restart 4000 -
4746 (SQN-E3-002, R10) 4700 -
4600 --
4500 -
4435 4400 --
4354 t
(3) i 1
1 4291 4300 -
1 4278 (1) i I
(4) 4198 4200 --
I 1
I 4100 --
4083 I
4000 3 Ain 2 hrs LOAD SEQUENCE TIME
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REFERENCES U2 Restart (DG 28-B)
U1 Restart (DG 2B B)
(1) flax Transient Load SON-E3-002,R7 Sh 44 SQN-E3-002,R10 Sh 9 (2) Max Transient Load SON-E3-002,R7 Sh 45 SQN E3-002,R10 Sh 9 (3) Max Running Lead SON-E3 015,R1 Sh L3 SON-E3-002,R10 Sh 9 (4) Max Continueus Load SQN E3-015,R1 Sh L.1 SQN-E3-002,R10 Sh 9 Notes 1.
This graph and the DGLA results are based on the heaviest loaded DG (D0 2B-B).
2.
'Maximus Running Load' represents the maximun load as a result of automatic sequencing.
' Maximum Continuous Load' represents removal of the nonessential loads in accordance with abnormal operating instruction ( A01)-35 and manual initiation of the hydrogen mitigation systen.
k
2-Comparison of the SQN DGLA Results M4JOR DIFFERENCES The following items represent the major differences between SQN-E3-002, R7, and SQN-E3-002, R10. The kW difference is shown for each item along with the appropriate scenario (s) and the points in time that the difference is applicable.
This list is not all inclusive because there are other differences (approximately 5 to 20 kW) such as more accur ate power factor / efficiency data for low voltage motors and differences because of sodifications.
A.
Transformer and Cable Losses Exclu(3d Justification: SQN-E3-002, Rio, Sh 243 Difference
-71.4 kW, Phase A and B, Transient and Steady-State (t t 0)
B.
Different Assumotion For Randon Loads Justification: SQN-E3-002, Rio, Sh 1 Differences
-194.4 kW, Phase A, Transient (t t 0)
-173.8 kW, Phase B, Transient (t t 0)
'HTTO Lube 011 Pumo' Not A DG Load Justification EFB-SON-MS-TI-05-001, R0 Difference:
-62.0 kW, Phase A and B, Steady-State (t 1 15 min)
D.
'D0 Immortion Heaters' Off By Thermostat Justification: SQN-E3 002, R10, Sh 4 Difference
-32.0 kW, Phase A and B, Steady-State (t < 2 hrs)
E.
'D0 Air Compressors' Are A Constant Load Justification:
Extra Coriser'eatism Differences
+16.8 kW, Phase A and B, Steady-State (t > 2 hrs)
F.
120-min Valves Stroke Before 25 min Justification: SQN-E3-002, RIO, Sh 215 Differences
-8.5 kW, Phase A and B, Steady-State (t < 2 hrs) f
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