ML20141M938
| ML20141M938 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 02/24/1986 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| SBN-950, NUDOCS 8603030082 | |
| Download: ML20141M938 (4) | |
Text
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UI SEABROOK STATION Engineering Office il Pub 5c Service of New HampeNro February 24, 1986 SBN-950 Mew Hampshire Yankee Division T.F. B7.l.2 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Vincent S. Noonan, Project Director PWR Project Directorate No. 5
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter SBN-903, datt.d November 27, 1985, " Resolution of Power System Branch Confirmatory Items," J. DeVincentis to G. W. Knigh ton (c) PSNH Letter SBN-899, dated November 21, 1985, "Seabrook Station Voltage Regulation Study," J. DeVincentis to G. W. Knighton
Subject:
Resolution of Power System Branch Confirmatory Item; SER Section 8.3.1.1.3, Item (2) (SER Confirmatory Issue No. 22)
Dear Sir:
SER Section 8.3.1.1.3, Item (2), regarding compliance with Position B3 of BranchTechnicalPosition(BTP)PSB-1,requiresconfirmationthatthestartingg and running of Non-Class lE loads coincident with the start of accident loads have been considered in the Voltage Regulation Study [ Reference (c)] and are reflected in Table 3 of the same study.
The running of Non-Class 1E loads coincident with the start of accident loads has been addressed in a previous response [ Reference (b)]. To address the concern regarding the starting of Non-Class lE loads during accident conditions, we have performed a review to determine the potential for these loads to randomly start coincident with accident loads and any subsequent effects on the Class lE bus voltages. The results of our evaluation indicate that the consideration of the random start loads coincident with accident loading does not reduce the Class 1E bus voltages, as presented in Table 3 of
'the Voltage Study, to unacceptable levels.
In the course of this review, we identified some additional loads which receive a start signal during accident conditions via the Containment Isolation (T) Signal. Previously, only those starts initiated by a Safety
. Injection (SI) Signal were considered. Table 3 of the Voltage Regulation Study has been revised to incorporate the simultaneous start of these loads during accident conditions. A copy of the revised Table 3 is attached.
8603030082 860224 PDR ADOCK 05000443 g(
E PDR P.O Box 300. Socbrook.NH 03874 Totophone [603]474 9521
United States Nuclear Regulatory Commission Attention:
Mr. Vincent S. Noonan Page 2 As can be seen in the enclosed table, all voltages are above the 80%
required for starting except the voltages at the terminals of fans EAH-FN-4A and 4B. This condition is determined to be acceptable based on the following reasons:
1.
Adequate voltage exists for the acceleration of all 4kV safeguards motors, and as these large motors accelerate (typically one to two seconds), voltage at the 480V buses will recover within two seconds such that the voltage at the terminals of the subject 460V motors will exceed the required 80%.
2.
Discussions with the fan vendor indicate that there would be no problem in starting and accelerating the subject fans with terminal voltages as low as 75% from zero to two seconds, followed by voltage recovery above 80% after two seconds. Vendor's reasons for justification include: a) subject motors are only 72% loaded, b) motors utilize Class H insulation, and 3) motors are only 7.5 hp but have frame size comparable to 20 hp motor.
3.
It should also be noted that during PSB-1 verification testing, it was identified that the computer model used to simulate motor start conditions yielded conservative results.
Based on the results of our evaluation which considers the starting and running of Non-Class 1E loads coincident with the start of accident loads, we believe that this submittal resolves that portion of SER Confirmatory Issue No.22 involving 529 Section 8.3.1.1.3, Item (2); and we request that the resolution f this item be reflected in the next supplement to Seabrook Station's bdR.
Very truly yo rs, m
John DeVincentis, Director Engineering and Licensing cc: Atomic Safety and Licensing Board Service List L
William S. Jord n, III Donald E. Chick Dicn2 Curren T:wn Manrg2r Harmon, Weiss & Jordan Town of Exeter 20001 S. Street, N.W.
10 Front Street Suite 430 Exeter, NH 03833 Washington, D.C.
20009 Brentwood Board of Selectmen Robert G. Perlis RED Dalton Road Office of the Executive Legal Director Brentwood, NH 03833 U.S. Nuclear Regulatory Commission Washington, DC 20555 Richard E. Sullivan, Mayor City Hall Robert A. Backus, Esquire Newburyport, MA 01950 116 Lowell Street P.O. Box 516 Calvin A. Canney Manchester, NH 03105 City Manager City Hall Philip Ahrens, Esquire 126 Daniel Street Assistant Attorney General Portsmouth, NH 03801 Augusta, ME 04333 Stephen E. Merrill Mr. John B. Tanzer Attorney General Designated Representative of Dana Bisbee, Esquire the Town of Hampton Assistant Attorney General 5 Morningside Drive Office of the Attorney General Hampton, NH 03842 25 Capitol Street Concord, NH 03301-6397 Roberta C. Pevear Designated Representative of Anne Verge, Chairperson the Town of Hampton Falls Board of Selectmen Drinkwater Road Town Hall Hampton Falls, NH 03844 South Hampton, NH 03827 Mrs. Sandra Gavutis Patrick J. McKeon Designated Representative of Selectmen's Office the Town of Kensington 10 Central Road RFD 1 Rye, NH 03870 East Kingston, NH 03827 Carole F. Kagan, Esquire Jo Ann Shotwell, Esquire Atomic Safety and Licensing Board Panel Assistant Attorney General U.S. Nuclear Regulatory Commission Environmental Protection Bureau Washington, DC 20555 Department of the Attorney General One Ashburton Place, 19th Floor Mr. Angi Machiros Boston, MA 02108 Chairman of the Board of Selectmen Town of Newbury Senator Gordon J. Humphrey Newbury, MA 01950 U.S. Senate Washington, DC 20510 Town Manager's Of fice (ATTN: Tom Burack)
Town Hall - Friend Street Amesbury, MA 01913 Diana P. Randall 70 Collins Street Senator Gordon J. Humphrey
'Seabrook, NH 03874 1 Pillsbury Street Concord, NH 03301 Richard A. Hampe (ATTN: Herb Boynton)
Hampe and McNicholas 35 Pleasant Street H. Joseph Flynn Concord, NH 03301 office of General Counsel Federal Emergency Management Agency 500 C Street, SW Washington, DC 20472
e TARLE 3 BUS AND MOTOR TERMINAL VOLTAGES WilEN STARTING ALL ACCIDENT LOADS SIMIfLTANE00 SLY UNIT RUNNING AT FULL LOAD 11TILITY GRID AT MINIMUM ANTICIPATED VOLTAGE
( ALL VOLTAGES ARE ON MOTOR VOLTAGE BASE)
NOMINAL SOURCE BUS OR HOTOR TAG NO._
Hi[
VOLTAGE. V FROM UAT. pu FROM RAT, pu 4160 0.9208 0.9344 EDE-SWG-5
- SI-P-6A 450 4000 0.9183 0.9318
- RM-P-8A 400 4000 0.9190 0.9325
- CS-P-2A 600 4000 0.9171 0.9306 480 0.8789 0.8936 EDE-US-51 460 0.8751 0.8898 EDE-MCC-512
- EAH-FN-4A 7.5 460 0.7971 0.8105
- CS-V-142 1.9 460 0.8404 0.8545
- CS-LCV-112B 1.9 460 0.8279 0.8418
- CS-LCV-112D 0.7 460 0.8497 0.8640
- CS-V-196 0.7 460 0.8579 0.8724 480 0.8868 0.9016 EDE-US-52 460 0.8852 0.9000 EDE-MCC-521
- CBA-FN-16A 15 460 0.8398 0.8538 CBA-FN-19 40 460 0.8781 0.8930 480 0.8879 0.9029 EDE-US-53 4160 0.8986 0.9145 EDE-SWG-6
- SI-P-6B 450 4000 0.8966 0.9126
- RH-P-8B 400 4000 0.8971 0.9130
- CS-P-2B 600 4000 0.8952 0.9111
- FW-P-378 900 4000 0.8924 0.9083 480 0.8506 0.8672 EDE-US-61 460 0.8466 0.8632 EDE-MCC-612
- EAH-FN-4B 7.5 t60 0.7728 0.7880
- SW-V-5 0.33 460 0.8396 0.8561
- CS-LCV-112C 1.9 460 0.8007 0.8165
- CS-LCV-112E 0.7 460 0.8295 0.8458
- CS-V-197 0.7 460 0.8317 0.8480 480 0.8693 0.8866 EDE-US-62 460 0.8674 0.8848 EDE-MCC-621 CBA-FN-32 40 460 0.8611 0.8786
- CBA-FN-168 15 460 0.8367 0.8534 SIMULTANEOUS STARTING LOAD NOTES:
1)
OTHER SAFETY AND NON SAFETY LOADS ARE RUNNING 2)
THE FOLLOWING LOADS ARE LUMPED TOCETHER AS BULK STARTING LOAD ON RESPECTIVE BUSES:
LOAD HP MCC LOAD HP MCC CS-V-167 0.7 EDE-McC-512 CS-V-143 1.9 EDE-MCC-612 i
CC-V-145 0.33 EDE-MCC-512 CS-V-168 1.0 EDE-MCC-612 CS-V-149 0.7 EDE-Mcc-512 CC-V-272 0.33 EDE-MCC-612 i
SW-V-4 0.33 EDE-MCC-512 CCC-V-14 0.33 EDE-MCC-521 CCC-V-28 0.33 EDE-MCC-621 TERMINAL VOLTAGES FOR TiiESE LOADS ARE NOT LISTED IN Tile TAtLC BECAUSE Tile LOADS IN Tile TABLE REPRESENT Tile WORST CASE VOLTAGE DROPS. -
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