ML19353A173

Addendum 1 To:Analyses of Adequacy of Davis-Besse Nuclear Power Station Onsite Electrical Auxiliary Distribution Power Sys Voltages.

ML19353A173
Person / Time
Site:	Davis Besse
Issue date:	12/30/1980
From:	TOLEDO EDISON CO.
To:
Shared Package
ML19353A171	List: ML19353A170 ML19353A173
References
NUDOCS 8101070380
Download: ML19353A173 (12)

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.

U ADDENDUli 1 TO:

ANALYSES OF THE ADEQUACY OF Tile DAVIS-BESSE NUCLEAR POWER STATION ONSITE ELECTRICAL AUXILIARY DISTRIBUTION POWER SYSTE:1 VOLTAGES Prepared in

Response

to the Nuclear Regulatory Commission Request for Additional Information of November 14, 1980 l

December 30, 1980 8101070 5W

Table of Contents Res po ns es Q"estions 1, 2, 3 Appendix B Case Numbering Sys tem (Revised 12/30/80)

Figure 1 Davis-Besse Nuclear Power Station Single Line Diagram Figure 5 Davis-Besse Nuclear Power Statica (Sheets 1, 2) Graph of Safety Related 4160 V Bu3 Voltage Versus Case Numbers (Revised 12/30/80)

Figura 6 Davis-Besse Nuclear Power Station (Sheets 1, 2) Graph of Safety Related 480 V Bus Voltage Versus Case Numbers (Revised 12/30/80)

Case Numbers: Graphs of Bus Voltage Versus Grid Voltage 11022 11122 11222 l

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i Question 1: The intent of Guideline 3 (Ref. 1) is that the analysis should include the ef fects of starting large non-Class 1E loads under worst case conditions, including all Class 1E equipment running, and determine if all Class 1E equipment will operate within their required operating voltage range and that separation from offsite power sources will not occur due to operation of the undervoltage relays. In your analysis (Ref.

1 2), does the full auxiliary electrical load used in the analysis of starting the reactor coolant pump and condensate pump include fully loaded Class 1E buses? If not, you are i requested to provide this analysis.

i Response: The analyses sent in our October 9,1979 letter did not include cases in l which a reactor coolant pump or condensate pump was started with all Class 1E loads i

running. These cases are included herein and are numbered 11122 and 11222 (see revised Appendix B for explanation of case numbering). The onsite distribution conditions

represented in case numbers with a 11... prefix were shown in the analyses to be the most severe for voltage drop.

Also included are the bus voltages for full load conditions plus fully loaded Class

1E buses (Case 11022).

The analyses show that the transient voltage dips caused by starting a reactor coolant pump or condensate pump do not fall below the voltage values needed by the Class 1E equipment to traverse the transient (see revised Figures 5 and 6). Class' IE equipment is not required to actuate during the transient since all Class IE loads are running in these cases.

. The steady state analysis (Case 11022) shows that the voltage on the Class 1E 4160V bus does not drop below the 90% relay setting during the worst operating conditions of full auxiliary load and full Class 1E load.

I Question 2: The single line diagram included in Reference 2 does not indicate any non-Class 1E 4160 volt buses. However, Reference 2 states that the analyses were performed starting the larges t 4.0 kV motor (condensate pump). What is the source of power for l 4.0 kV condensate pump motor?

l l Response: On the single line diagram (Figure 1) included in our report, the non-

! Class 1E 4160 volt buses are numbered "C2" and "D2". Only the portion of the single line that is inside the dotted lines is Class 1E.

L Question 3: The Guidelines (Ref. 1) request that the analyses include the voltages at l

the terminals of each safety load. You state that the analyses are a function of bus voltage, not motor base voltage. Provide equipment terminal voltages.

Response

The analyses were done based on the assumption that cable voltage drops l are negligible. Therefore, equipment terminal voltage equals bus voltage.

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1 4

3 4

APPENDIX B CASE NUHRERING SYSTEM

_X f _X, X f f Startup/ Unit Aux. - Special Cases Transformer .

A 1 - One Startup XFMR > As Required Bus Tie loading B 2 - Both Startup XFMRS Transformer -

0 - No Load 3 - Unit Aux. XFMR 1 - One Bus 1 - Full Load Tie XFMR 2 - Full Load Plus ESFAS 2 - Both Bus Tie XFMRS.

Equipment Ta p Status Setting 0 - Nothing Starting 2 - Unit Aux. - 2 Taps Down 1 - RCP Motor Start Startup/Rus Tie - 1 Tap Down 2 - Cond. Pisap Start Unit Substation - Nominal 3 - SFAS Start i

+

Revised 12/30/80

To To To

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