ML20207H211
| ML20207H211 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/31/1986 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | Denton, Youngblood B NRC, Office of Nuclear Reactor Regulation |
| References | |
| GN-1277, NUDOCS 8701070482 | |
| Download: ML20207H211 (5) | |
Text
f Georgia Pbwer Company Post Offc0 Box 282 Waynesboro, Georgia 30830 Telephone 404 054-9961 404 724 8114 Southerrt Company Services, Inc.
Ibst Office Box 2625 Birmingham, Alabama 35202 Telephone 205 870-6011 y
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December 31, 1986 Director of Nuclear Reactor Regulation File X7B35 Attention:
Mr. B. J. Youngblood Log:
GN-1277 PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C.
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NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE ELECTRIC GFNERATING PIANT - UNITS 1 AND 2 STARTUP TEST PROGRAM: LOSS OF OFFSITE POWER TEST i
Dear Mr. Denton:
In recent discussions your staff requested information on the loss of offsite power test. Attached is a revised test abstract, FSAR paragraph 14.2.8.2.46 which provides the requested information to include a separate discussion of j
justification for these changes This revised abstract will be included in the next FSAR amendment.
If your staff requires any additional information, please do not hesitate to contact me.
Since rely, t.
. A. Bailey Project Licensing Manager JAB /sm xc R. E. Conway NRC Regional Administrator R. A. Thomas NRC Resident Inspector l
J. E. Joiner, Enquire D. Feig B. W. Churchill, Esquire R. W. McManus M. A. Miller (2)
L. T. Cucwa B. Jones, Esquire Vogtle Project File G. Bockhold, Jr.
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8701070482 861231 h
PDR ADOCK 05000424 A
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Attachment GN-1277
Subject:
Revision for FSAR Section 14.2.8.2.46, Loss of Offsite Power A revision to the Loss of Offsite Power test abstract, Section 14.2.8.2.46, Ammendment 29 (dated 11/86) has been requested and is included below. All sections were revised as shown below. Strikeouts are deletions; additions are underlined. The entire abstract is shown for clarity. Reasons for change are listed below the abstract.
14.2.8.2.46 Loss of Offsite Power at Greater Than 10-Percent Power Test A.
Objective To demonstrate pe6 mary plant rt+ ponse following a plant trip with no offsite power available.
B.
Prerequisites 1.
The reactor will be operated at approximately 10 to 20 percent power with the reserve auxiliary transformers supplying station electrical load.
2.
The test will occur prior to ascending from the nominal 20% power plateau.
C.
Test Method 1.
Manually te6p the reeeter, Simulate a loss of offsite power t31 one safety train and observe that its diesel Renerator autostarts and autoloads.
2.
Simultaneevely 6eelate ::: IE leads wh6ek wev&d effeet primary plant e::;;;;;. Manually start eman-ne equipment as required for protection of non safety related secondary equipment.
3., Isolate the reserve auxiliary transformers.
4.
Verify reactor trip.
35 Verification ei Verify propee automatic starting and lead sequeneing automatic loading of d6esel generatere the other diesel generator to demonstrated as meetbed in 44,2,8viv97.
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7'461 Verify that natural circu1ation conditions have been established.
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L Abstract For Loss Of Offsite Power Test (Continued)..... 12/29/86.........
4,A[3 Verify that the RCS can be maintained in a stable shutdown condition utilizing the power-operated atmospheric relief valves to remove decay heat.
8.
Certain non safety related secondarv plant equipment
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may g immediately reenergized.
D.
Acceptance Criteria 1.
The automatic transfer of from the reserve auxiliary transformers,to the onsite standby power supply is demonstrated as desee6 bed in 44,218vir97.
2.
The primary plant can be maintained in a stable condition on natural circulation using the battery and diesel power supplies for 30 minutes.
(End Of Abstract Text) 1
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s Justification For Changes N, -
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4 Section A: OBJECTIVE.
The scope of the test has been expanded to include the entire plant.
Section B: PREREQUISITES:
1.
The reserve auxiliary transformers normally supply power to the station below 20% power. This lineup prevents the turbine / generator from supplying power to the station per design for 30 seconds after turbine trip. This method forces a simultaneous losa.of power without turbine coastdown.
2.
Completion of this testing prior to leaving the 20% plateau conforms to recently restated NRC and Reg. Guide 1.68 philosophy of testing safety features as soon as practical. The plant's turbine generator overspeed trips, generator excitation, and other items important to safe operation must be sufficiently adjusted, and these adjustments will require operation at the 20% power plateau.
2
.A.
p Abstract For Loss Of Offsite Power Test (Continued)..... 12/29/86.........
Section C: TEST METHOD:
1.
A loss of offsite power will be initiated in stages to protect plant equipment. One diesel generator will be started prior to general loss of offsite power and reactor trip by a simulated loss of offsite power signal. The breaker feeding its bus from i;
L the Reserve Auxiliary Transformer (RAT) will be opened. Automatic starting and loading will be observed. The diesel will supply cooling to the reactor coolant pump seals throughout the 3
remainder of the test.
2.
Battery powered lubrication and seal oil system pumps in the secondary plant will be started prior to the test to ensure continuous protection of secondary equipment including the main turbine generator, main generator, and main feedwater k
pump turbines.
v x 3.
Isolating the reserve auxiliary transformers will trip the reactor and the plant.
J 4.
Resulting reactor trip must be verified.
5.
The other diesel generator will autostart and autoload on loss of offsite power. Timing and sequencing verification will not be performed. The preoperational test will have performed this measurement. Verification of autostart and autoload are sufficient.
6.
The order of performance has been changed between this and the following step because natural circulation is normally verified within ten minutes. This occurs prior to the 30 minute i
requirement for maintaining the RCS stable.
7.
The order of performance was changed. Stable conditions are a part of this test.
8.
In order to protect equipment and preserve chemistry conditions in the secondary side, certain equipment including main feedwater pump and main turbine lubricating oil, turning gear motors, generator seal oil pumps, condensate pumps, and circulating water pumps may be immediately restarted.
i Service and instrument air will not be restarted until 30 minutes f
after start of the test.
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.,c Ab: tract F:r Lors Of Offcito Power Tact (Continued)..... 12/29/86.........
s Section D:
ACCEITANCE CRITERIA:
l.
References to preoperational testing were deleted. The original intent was to take credit for the preoperational test in FSAR-Section 14.2.8.1.97 and not perfoni this activity during startep testing. Automatic starting and loading will now be verified as requested by the NRC.
2.
Grammar correction.
(End of Justification Text.)
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