TXX-6794, Interim Deficiency Rept CP-87-95 Re Input Voltage to Uninterruptible Power Supply Inverter IV 1PC3.Voltage Drop Due to Line Loss May Reduce Inverter Input Voltage to Less than Min Value.Evaluation Continuing.Next Rept by 880108: Difference between revisions

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                                                                      =M                     Log # TXX-6794 L
=M Log # TXX-6794 L
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File # 10110 908.3 Ref, # 10CFR50.55(e) 7t# ELECTRIC October 5, 1987-           !
908.3 Ref, # 10CFR50.55(e) 7t# ELECTRIC October 5, 1987-William G. Counsli Execu,ive Vice President U.
William G. Counsli Execu,ive Vice President U. S'. Nuclear Regulatory Commission
S'. Nuclear Regulatory Commission
                          'Attnt' Document Control Desk Washington, D. C. 20555
'Attnt' Document Control Desk Washington, D. C. 20555


==SUBJECT:==
==SUBJECT:==
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DOCKET.NOS. 50-445 AND 50-446 UNINTERRUPTIBLE POWER SUPPLY SDAR: CP-87-95 (INTERIM REPORT)
DOCKET.NOS. 50-445 AND 50-446 UNINTERRUPTIBLE POWER SUPPLY SDAR: CP-87-95 (INTERIM REPORT)
Gentlemen:
Gentlemen:
On September 3,1987, we verbally notified your Mr. H. S. Phillips of a                       !
On September 3,1987, we verbally notified your Mr. H. S. Phillips of a deficiency involving the input voltage to the Station uninterruptible Power Supply inverter IV 1PC3. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
deficiency involving the input voltage to the Station uninterruptible Power Supply inverter IV 1PC3. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
S)ecifically, the minimum input voltage required by the inverter is 105 VDC, i
S)ecifically, the minimum input voltage required by the inverter is 105 VDC,                 i w11ch is the associated Class 1E battery's minimum output by design.                 The voltage drop (due to line loss) between the battery and the inverter has not been considered and may reduce the input voltage at the inverter to less.than 105 VDC.
w11ch is the associated Class 1E battery's minimum output by design.
Our evaluation of this issue is continuing.               We expect to submit our next report by January 8,1988.
The voltage drop (due to line loss) between the battery and the inverter has not been considered and may reduce the input voltage at the inverter to less.than 105 VDC.
Very truly yours, W. G. Counsil WJH:tgj c- Mr. R. D. Martin, Region, IV                                                 ,
Our evaluation of this issue is continuing.
Resident inspectors, CPSES (3) 8710150320 e71005 PDR S
We expect to submit our next report by January 8,1988.
ADOCK 05000445 ppg                                                     g n,n ou,, s,-,     a s, o.m .. w. mo,
Very truly yours, W. G. Counsil WJH:tgj c-Mr. R. D. Martin, Region, IV Resident inspectors, CPSES (3) 8710150320 e71005 PDR ADOCK 05000445 S
_ _ _ _ _ -                          _ _ _ _}}
ppg g
n,n ou,, s,-,
a s, o.m.. w. mo,
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Latest revision as of 04:50, 3 December 2024

Interim Deficiency Rept CP-87-95 Re Input Voltage to Uninterruptible Power Supply Inverter IV 1PC3.Voltage Drop Due to Line Loss May Reduce Inverter Input Voltage to Less than Min Value.Evaluation Continuing.Next Rept by 880108
ML20235V793
Person / Time
Site: Comanche Peak  
Issue date: 10/05/1987
From: Counsil W
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CP-87-95, TXX-6794, NUDOCS 8710150320
Download: ML20235V793 (1)
v • d • e


Text

=- _ _ -

i

(.

M.

=M Log # TXX-6794 L

3 File # 10110 i

=

=

908.3 Ref, # 10CFR50.55(e) 7t# ELECTRIC October 5, 1987-William G. Counsli Execu,ive Vice President U.

S'. Nuclear Regulatory Commission

'Attnt' Document Control Desk Washington, D. C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET.NOS. 50-445 AND 50-446 UNINTERRUPTIBLE POWER SUPPLY SDAR: CP-87-95 (INTERIM REPORT)

Gentlemen:

On September 3,1987, we verbally notified your Mr. H. S. Phillips of a deficiency involving the input voltage to the Station uninterruptible Power Supply inverter IV 1PC3. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).

S)ecifically, the minimum input voltage required by the inverter is 105 VDC, i

w11ch is the associated Class 1E battery's minimum output by design.

The voltage drop (due to line loss) between the battery and the inverter has not been considered and may reduce the input voltage at the inverter to less.than 105 VDC.

Our evaluation of this issue is continuing.

We expect to submit our next report by January 8,1988.

Very truly yours, W. G. Counsil WJH:tgj c-Mr. R. D. Martin, Region, IV Resident inspectors, CPSES (3) 8710150320 e71005 PDR ADOCK 05000445 S

ppg g

n,n ou,, s,-,

a s, o.m.. w. mo,

_ _ _ _

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