ML17053C331
| ML17053C331 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/02/1981 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Dise D NIAGARA MOHAWK POWER CORP. |
| References | |
| NUDOCS 8102240132 | |
| Download: ML17053C331 (10) | |
Text
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+>>*+4'NI'9 NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 February 2, 1*981 Docket No. 50-220 0oS'g)yhlN Hr. Donald P. Disc Vice President - Engineering c/o Hiss Catherine R. Seibert Magara Mohawk Power Corporation 300 Erie Boulevard West
'yracu'se, New York 13202
Dear Mr. Disc:
C We have received your letter of December 10, 1980 in response to our request for additional information regarding your October 3, 1979 letter on adequacy of station electric distribution system voltages for Nine Mile Poi-nt Unit l.
We have reviewed the correspondence indicated and find.that portions of the questions still remain unanswered.
As a'esult we are re-submitting the original questions followed by a fuller discussion of the areas which still remain unanswered or which require clarification.
Please provide your response to the questions in the enclosure to this
.letter within 45 days of receipt of this letter.
Sincerely, OrJNInal Signed by T.A. IyyolitO Thomas A. Ippolito, Chief Operating Reactors Branch ¹2 Division of Licensing
Enclosure:
Request for Additional Information cc:
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NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 s '>-Q~g February 2, 1981 Docket No. 50-220 Mr. Donald P. Disc Vice President - Engineering c/o Miss Catherine R. Seibert
, Magara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 FEBOS 3981 J
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Dear Mr. Disc:
'We have received your letter of December 10, 1980 in response to our request for additional information regarding your October 3, 1979 letter on adequacy of station electric distribution system voltages for Nine Mile Point Unit l.
We have reviewed the correspondence indicated and find that portions of the questions still remain unanswered.
As a result we are re-submitting the original questions followed by a fuller discussion of the areas which stil,l remain unanswered or which require clarification.
-Please provide your response to the questions in the enclosure to this letter within 45 days of receipt of this letter.
Sincerely,
Enclosure:
Request for Additional Information
/
J i homas
. Ippol ito, Chief Operating Reactors Branch 82 Division of Licensing cc:
See next page
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Nr. Donald P. Disc CC:
Eugene B. Thomas, Jr.,
Esquire
- LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire
- Avenue, N.
W.
'ui.te 1100 Washington, D, C.
20036 State University College at Oswego Penfield Library'- Documents
- Oswego, New York 13126 Mr. Joseph J.
- Sunser, Manager System Security Niagara Mohawk Power Corporation 300 Erie Boulevard West
'yracuse, New York 13202 (Security matters only)
Resident Inspector c/o U.S.
NRC P. 0.
Box 126
- Lycoming, New York 13093
P P~
0 RE(UEST FOR ADDITIONAL INFORMATION NINE NILE POINT UNIT 1 ADE(UACY OF STATION El ECTRIC DISTRIBUTION SYSTEM VOLTAGES
REFERENCES:
1.
NRC letter (William Gammill) to All Power Reactor Licensees, dated August 8, 1979 2.
Niagara Hohawk Power Corporation letter (Donald P.
Diese) to NRC (William Gammill),
dated October 3, 1979
.3..
Niagara lhhawk Power Corporation 'letter (Gerald. K. Rhode)" to NRC (George Lear), dated October 18, 1976 4.
Niagara Mohawk Power Corporation letter (Donald P. Disc) to NRC (William Gammill), dated December 7, 1979 In reviewing the information provided in Reference 2 in response to the NRC letter of August 8, 1979, there are several areas where you have not provided sufficient information to permit an evaluation of the adequacy of station electric distribution system voltages for the Nine Nile Point Unit 1 nuclear power station.
The following additional information is required:
l.
The voltage rating for all Class lE equipment for continuous operating
'nd starting conditions..
Discussion:
Voltage ratings for "operation" of motors is given in reference 3, section l.g as
+ 105.
If this figure is used as the minimum starting voltage as well, then the bus voltages given in reference 3 during full load with the grid at minimum voltage are less than the minim'um required starting voltages for the 575 volt motors used in the diesel generator starting system.
The actual starting voltages should therefore be given.
Reference 3 also says, "all controls" supplied with power from the 600 volt boards will operate satisfactorily within a 495 to 605 volt range.
Do these controls include things.like inverters, battery chargers, motor generators, motor contactors, etc? If so, please specify the individual loads it applies to. If not, give the individual ratings of these or any other non-motor, Class lE loads including the pickup and dropout voltages of motor contactors and motor-operated-valves.
The ratings of low voltage AC (less than 600v)
GDC 13 type'instrumentation should also be provided.
An analysis of the voltage at the terminals of all Class 1E motors and starters during starting and running under worst case plant operating conditions.
Discussion:
Reference 3 analysis gave voltages only down to the l~otor Control Center level.
They should also be provided down to the equipment terminals for all the loads discussed in question 1
above:
An analysis of the effects of starting a large non-CTass lE load on the Class l,E equipment.
The analysis should include the voltage at the terminals of all Class.1E loads under the conditions of full
'auxiliary plant load, including Class 1E loads, during the starting of the non-Class 1E loads and also determine if separation from the offsite power source will occur as a result of the action of the undervoltage relays.
Discussion:
Previous correspondence (refer'ence
- 4) indicated an analysis and test was accomplished in 1974 to demonstrate start-up of a feedwater string.
The motor starting times were given but the corresponding voltages at the Class lE load terminals at minimum grid voltage was not.
The analysis as described in the above question is therefor e required.
A test is also required by reference 1 to verify the validity of all analysis results, including both steady state and transient.
An analysis should be per formed to assure that the maximum voltage ratings of the Class 1E.loads will not be exceeded under conditions of minimum plant electrical load and maximum expected offsite grid voltage.
Discussion:
An analysis at maximum voltage was provided in reference 3, but voltages at the Class lE load terminals were not given.
The analysis results also indicated the maximum voltage (621 volts) at the 600 volt buses was greater than the maximum rated operating voltage (605 volts) of the Class 1E loads.
This should be explained.
Documentation that no manual load shedding is used to prevent unacceptable voltage at the terminals of the Class 1 E equipment.
Discussion:
None of the previous correspondence indicated whether manual load shedding was assumed for the purposes of the analyses performed.
0 FEB 0,4 1981