ML19323E637
| ML19323E637 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 05/02/1980 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Peoples D COMMONWEALTH EDISON CO. |
| References | |
| REF-GTECI-B-45, REF-GTECI-NE, TASK-B-45, TASK-OR NUDOCS 8005270077 | |
| Download: ML19323E637 (5) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION g
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WASHINCTON, D. C. 20555 NAY 2
1980 Docket Nos. 50-295 and 50-304 Mr. D. Louis Peoples Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Peoples:
We are reviewing your responses of November 1, and December 14, 1979 relating to our generic concern "B-45 Adequacy of Station Electric Distribution System Voltages." Your response was in reply to our letter to all reactor licensees dated August 8,1979.
In order for our review to continue, you are requested to provide the additional information shown on the enclosure within 45 days of receipt of this letter.
Si cerely,
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Steven A. Varga, Chi Operating Reactors Bra h fl Division of Licensing
Enclosure:
Questions cc: w/ enclosure See next page THIS DOCUMENT CONTA!NS POOR QUAUTY PAGES b
800527009 f
4 Mr. D. Louis Peoples Commonwealth Edison Company cc: Robert J. Vollen, Esquire 109 North Dearborn Street Chicago, Illinois 60602 Dr. Cecil Lue-Hing Director of Rasearch and Development Metropolitan Sanitary District of Greater Chicago 100 East Erie Street Chicago, Illinois 60611 1
Zion-Benton Public Library District 2600 Emmaus Avenue Zion, Illinois 60099 i
I Mr. Phillip P. Steptoe Isham, Lincoln and Beale Counselors at Law One First National Plaza 42nd Floor Chicago, Illinois 60603 Susan N. Sekuler, Esquire Assistant Attorney General Environmental Control Division l
j 188 West Randolph Street, Suite 2315 Chicago, Illinois 60601 l
I U. S. Nuclear Regulatory Commission Resident Inspectors Office Post Office Box 288 Deerfield, Illinois 60015 h
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l ENCLOSURE
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ZION 1 AND 2 (DOCKET NOS. 50-295 AND 50-304)
QUESTIONS ON ADEQUACY OF STATION ELECTRIC D:STRIBUTION SYSTD1 VOLTACES
References:
Ceco letter (Janecek) to NRC (Gammill), " Adequacy of Station Electric a.
Distribution System Voltages," dated February 1, 1980.
b.
NRC generic letter to all Power Reactor Licensees, " Adequacy of Statian Electric Distribution System Voltage," dated August 8,1979.
" Adequacy of Station Electrical Distributi-n Systems Voltages, Dresden c.
Unit 1," Sargent & Lundy Engiheers report, attachment A to reference a.
d.
CECO letter (Janecek) to NRC (Gammill), " Adequacy of Station Electric Distribution System voltage," dated November 1,1979.
" Adequacy of Station Electrical Distribution Systems Voltagi,"
e.
Dresden Units 2/3," Sargent & Lundy Engineers report, enclosure 1 of re ference d.
f.
" Adequacy of Station Electrical Distribution Systems Voltages," Quad-Cities," Sargent & Lundy Engineers report, enclosure 2 of reference d.
g.
" Adequacy of Station Electrical Distribution Systems Voltages," Zion,"
Sargent & Lundy Engineers report, enclosure 3 of reference d.
h.
CECO letter (Janecek) to NRC (Ga= mill), " Adequacy of Station Electri.e Distribution System Voltages," dated December 14, 1979.
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Ojestions:
1.
The CECO succary attachment" (last paragraph) concludes that the computer program results need not be compared to test results for Dresden 1.
While the Zion program and ' input para =eters were verified by test, it is not known that the input parameters for Dresden 1 (or cther units) can be' verified by test.
CECO should verify the program, input variables, and constants 6 sed for the Dresden and Quad-Cities analyses per the requirements of reference b, page 2, paragraph 3.
2.
Were the grid voltage values, 34.8'to 36.3 kV (item II, page 1)",
132 to 142 kV (item II, page 1)", 344 to 362 kV (item II, page 1)",
333 to 354 kV (iten II, page 1)I, and 343 to 354 kV (item II, page 1)8 deter =ined per NRC guideline 67 If not, describe how they were cbtained.
3.
Supply the calculated voltages for all low voltage AC (less than 430 V) class IE buses for each analyzed case.
Do these systems supply any instruments and control circuits as required by GDC 137 If so, is all equip ent capable of sustaining the analyzed voltages (blowing fuses, overheating, etc.)?
Is the connected equipment qualified by the manu-facturers to withstand the expected voltages without affecting their ability to perform 'he required function?
4.
Figure 3*'*'I'8 shows the lowest bus voltage when starting the largest non-class 1E load for the respective plants. Did this motor start when all the other loads were running? Give the effect of start-b ing this load on all class 1E buses and loads per NRC guideline 3,
What are the bus and load voltages when starting the largest 480 V class 1E load whan all other : lass 1E loads are running?
5.
Define how the acronyms SAT and RAT are used.
It appears, from refer-ences e, f, and g, that they =ight be used interchangeably. The sum-
=ar;. refers to SA!, while the detail review and figures refer to RAT on all units except Dresden 1.
2
s 6.,
is it prssible that tha unit's UAT can supply the class 1E lead greep while the main generator is' disconnected?
If nothing prohibits such a connection to the offsite grid, this analysis should be performed per NRC guideline b.
For Multi-Uni: Plants:
7.
Each SAT is capable of supplying its own unit's auxiliary load and the e=ergency load of the other unit (see the summary *'I'8).
NRC guide-line 2 requires the voltage study for the largest load demand including when one unit is in LOCA and the other unit is in safe shutdown.
The intertie between buses 24-1 and 34-1 (Dresden)", 14-1 and 24-1 (Quad-Cities)I and a similar arrangecent for Zion (bus numbers are unread-able in the report)E demand this voltage analysis.
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