Text

Forwards Info on Adequacy of Util Electrical Distribution Sys Voltages,In Response to NRC
	ML20009A965
Person / Time
Site:	Fort Calhoun
Issue date:	07/02/1981
From:	William Jones; OMAHA PUBLIC POWER DISTRICT
To:	Clark R; Office of Nuclear Reactor Regulation
References
	NUDOCS 8107140556
	Download: ML20009A965 (11)
	v • d • e

..

Omaha Public Power District 1623 HARNEY a OMAHA. NEBRASKA 68102 m TELEPHON E 536 4000 AREA CODE 402 July 2,1981 Il

,c' Mr. Robert A. Clark, Chief

/

Office of Nuclear Reactor Regulation (i

10 U. S. Nuclear Regulatory Commission

("

.Ob 131981" 1.

Division of Licensing

' J d

T, /

Operating Reactors Branch No. 3 o.s.

Washington, D.C.

20555 W.

/

ut D g

/

Reference:

Docket No. 50-285

Dear Mr. Clark:

The Commission's letter dated May 13, 1981, forwarded questions regarding the adequacy of Fort Calhoun Station's electrical distribution system voltages. Omaha Public Power District's response to those questions are attached.

Since ely,

'\\h' ()'$W W. C. Jones Divisi n Manager Produ ion Operations WCJ/KJM/TLP:jmm Attachment cc: LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.

Washington, D.C.

20036 Ohho!oOojs5 p6k PDR L

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Attachment Question (A) Tables 1 and 2 of attachment 9 provide transient voltage values during the sequenced starting of the engineered safeguard loads on buses 1A3 and 1A4.

1.

What are the final (steady-state) voltagas at the 4160V and 480V buses, the 4160V, 4000V, and 460V motor tm ainals, and the 460V motor starters when all safeguard loads are operacing for Cases 4, 5, and 6 of Table 1 and Cases 3, 4, 5, and 6 of Table 2?

2.

What are the lowest 4160V bus transient voltages for Cases 4, 5, and 6 of Tables 1 and 2, attachment 9?

. Response The intent of question (A), part 1., is apparently to determine if the 161 kV tap setting on the 161/4.16 kV transformers would adversely affect the steady-state voltages after all the engineered safeguard loads have started and become operable. With this understanding, it is then apparent that, if the worst case motor terminal voltage exceeds minimum operating limits, then all the other cases would also be acceptable. This is what is shown in tables provided by enclosure 1, where the worst case was taken to be the motor which provides the largest load and cable impedence.

For Table 1, the worst case gave a per unit value of 0.7494 which is 75% of 480 volts which exceeds the minimum acceptable level of 70% of 480 volts at the motor terminals.

Question l

(B) The voltages at buses 1A3 and 1A4 in Tables 1, 2, and 3 of attachment 5 appear to be based on transformers T1A3 and T1A4 set on the 165kV tap (see sheet 2). What will the voltages be at buses 1A3 and 1A4 in Tables 1, 2, i

and 3 if the transformers are on the 161kV tap?

Response

Some load flows were run to examine the effect of changing the taps on the l

house service transformers at Fort Calhoun from 165 kV to 161 kV. Of primary interest is the power flowing through the generator auxiliary transformer when its secondary is tied to the secondary of the house service transformer. This is a condition that exists momentarily during the normal transfer of station service loads between the 161 kV and the 22 kV sources.

Buses 1A2 and 1A4 were used in this analysis because they are more heavily loaded than buses 1A1 and l

1A3. Enclosure 2, column VIA2, V1A4, demonstrates this effect.

i Cases were run with the 22 kV bus voltage at.955 per unit (21.01 kV) and at 1.023 per unit (22.5 kV). The transmission system used in the model was 1978 summer peak load conditions, both with the system intact and with an outage of 1

l

, Response (Continued) the Raun 345/161 kV transformer. Previous investigations have shown this transformer outage causes the greatest difference in the voltage phase angle between the 22 kV and 161 kV buses at Fort Calhoun.

Under the condit h s studied, the 161 kV tap caused a slight decrease in the transformer MVA loading.

In all cases, the loading on the generator auxiliary transformer (22 kV/4160V) was between 25 and 30 MVA.

For the case where 161 kV is transferred to 165 kV directly, it was determined that voltages were higher for the 161 kV tap. Column VIA1 of enclosure demon-strates this effect and it is expected that the same effect would be seen for all buse:

Question (C) The FSAR and attachment 6 indicate that provisions exist to start up the plant from the 345kV source. Can this source be used tn safely shut the plant dows. under LOCA conditions if the 161kV source is not available?

If so, how soon would the 345kV source be available?

Response

Yes.

If the 161 kV source were not available and a LOCA were to occur, the operator would open the motor operated disconnect switch DS-T1 (generator disconnect switch), and close the two 345 kV breakers 3451-4 and 3451-5. The time required would be the time necessary for the equipment to operate.

Question (D) What is the service factor for the 4160V, 4000V, and the 460V safeguards motors?

Response provides a partial listing of motor service factors. Additional investigation is required for the remaining motors and this information will be provided by August 15, 1981.

Question (E) The NRC letter of August 8,1979, requires a test be performed to verify your analytical results. The latest guidelines required that this test should be performed by:

(a) Loading the station distribution buses including all Class 1E buses down to the 120/208V level, to at least 30',

(b) Recording the existing grid and Class 1E bus voltages and bus loading down to the 120/208 volt level at steady state conditions and during the starting of both a large Class 1E and non-Class IE motor (not

, Question (Continued)

(Note)

To minimize the number of instrumented locations (recorders),

during the motor starting transient tests, the bus voltages and loading need only be recorded on that string of buses which previously showed the lowest analyzed voltages.

(c) Using the analytical techniques and assumptions of the previous voltage analyses and the measured existing grid voltage and bus loading conditions recorded during conduct of test, calculate a new set of voltages for all Class 1E buses down to the 120/208 volt level.

(d) Compare the analytical derived voltage values against the test results.

With good correlation between the analytical results and test results, the test verification requirement will be met.

That is, the validity of the mathematical model used in performance of the analysis will have been established.

In general, the test results should be within + 3% of the analytical results; however, the difference between the two -hen subtracted from or added to should never provide values that would allow operation of the Class IE equipment outside of rated voltage ranges.

Please provide a test description and date by when test results will be available.

Response

During 1978, the District did some testing to verify the electrical distribution system voltages. The 1978 test data is still being evaluated to determine the correlation to present guidelines, and determine further testing.

The District expects to provide our response by August 31, 1981.

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ML20009A965

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