ML040770247
| ML040770247 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/22/2004 |
| From: | Thadani M NRC/NRR/DLPM/LPD4 |
| To: | Walker R TXU Electric |
| Thadani M, NRR/DLPM, 415-1476 | |
| Shared Package | |
| ML040820923 | List: |
| References | |
| LAR 02-06, TAC MB9532, TAC MB9533 | |
| Download: ML040770247 (4) | |
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, C-.\\TEMP\\GW)00001.TMP oaigel i C:\\TEMP\\GW}OOOO1.TMP Page 1 Mail Envelope Properties (401029CE.248:15:21310)
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Preliminary Request fir Additional Informiation 1/22/04 2:5 1PM Mohan Thadani MCT~nrc.gov Recipients txu.corn ccorbin CC (Intemet:ccorbin @txu.com) rwalker5 (Internet:rvalker5 @txu.com) fred madden CC (Internetffred.madden @txu.com)
Action Transferred Transferred Date & Time 01/22/04 02:52PM 0 1/22/04 02:52PM nrc.gov owf2-po.OWFNDO RVJ CC (Ronaldo Jenkins)
SNS1I CC (Saba Saba) nrc.gov owf4..po.OWFN_-DO MCT CC (Mohan Thadani)
NBL CC (Ngoc Le) nrc.gov owf5-po.OWFNDO THB CC (Thomas Boyce)
Delivered Opened Opened Delivered Opened Delivered Opened 0 1/22/04 02:5 1 PM 01/22/04 03:17PM 01/23/04 07:19AM 0 1/22/04 02:51 1PM 01/22/04 02:52PM 01/22/04 02:52PM 01/22/04 02:57PM txu.com.
dbuschbl. CC (Internet:dbuschbl @txu.com)
Transferred Post Office txu.com fred owf2-po.OWVFNDO owf4-po.OWFN_-DO owf5..po.OWFNDO Delivered 0 1/22/04 02:5 1 PM 01/22/04 02:51PM 01/22/04 02:52PM 01/22/04 02:52PM Route Internet Internet:txu.com nrc.gov nrc.gov nrc.gov txu.com Files MESSAGE Size 5622 Date & Time 0 1/22/04 02:5 1 PM Options
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Immediate Delivered & Opened
i Mohan Thadani - Preliminary Request fir Additional Information F -
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Subject:
Preliminary Request fir Additional Information Roger:
In reviewing the TXU's license amendment request, LAR 02-06 regarding DC electrical power tech. specs changes pursuant to TSTF 360, the NRC staff has identified the following preliminary request for additional information. After your staff reviews this preliminary request, I would like to set up a phone call for the NRC staff and theTXU staff to discuss the issues raised. During the call we will arrive at an agreement on the final form of the request, schedule for a response, and whether you would want a formal NRC letter of agreed upon request or telephone agreement is sufficient to respond to.
Thanks.
Mohan PRELIMINARY REQUEST FOR ADDITIONAL INFORMATION FOR COMANCHE PEAK STEAM ELECTRIC STATION UNITS 1 AND 2. TAC MB9532 AND MB9533:
1: It was stated in the submittal that there are two 100% capacity battery chargers per battery. For a plant in Modes 1, 2, 3, and 4, one charger for each battery is required to be operating and the other is kept as a spare.
(A)
Please explain the administrative control, if any, under which the plant operator would know which one of the two battery chargers is the *required" charger to maintain the DC subsystem operable. Please provide information regarding AC power supply sources to the battery chargers during normal plant operation and during loss of offsite power sources.
(B)
Please explain steps taken, if any, to meet either required action for CONDITION 3.8.4.A.1 and/or CONDITION 3.8.4.A.2 when either the "required" charger and/or the "spare" charger are not yet restored to operable status.
(C)
When the so-called 'required" charger is declared inoperable" and the "spare" charger is switched in to substitute for the inoperable charger, what maintenance actions, if any, will be initiated for the inoperable charger, while the completion time for CONDITION 3.8.4.A.1 AND CONDITION 3.8.4.A.2 is in effect?
2: It was stated in the submittal that CPSES is presently committed to IEEE Standard 450-1995 (Ref. 4),
which states that battery degradation is indicated when the battery capacity drops more than 10% from its capacity of the previous performance test. However, CPSES states in the submittal that degradation is indicated when the battery capacity drops by more than 10% relative to its average capacity on the previous performance test.
Please explain and provide justification for the use of the average capacity and clarify the difference between the IEEE definition and CPSES definition as stated in the submittal.
3: It was stated in the submittal that there are two 100% capacity battery chargers per battery. For plant in Mode 1, 2, 3, and 4, one charger for each battery is required to be operating and the other is kept as a spare.
Please define "100% capacity battery charger" and state if each of the chargers was designed to be capable of handling transient loading demand requirements for all initiating events if the associated battery is out of service for any reason. This includes the adequacy of the battery
I~ Mohan Th ad ani - Preliminiariy Re-q~u-est fir -Ad'di-tio"n'al In'f-o--rmat-io-n'
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sources charger to handle transient loading requirements caused by the re-alignment of the AC
'following a reactor trip.
CC:
Internet:ccorbin~txu.com; Internet:dbuschbl @txu.com; Internet:fred.madcden~txu.com; Mohan Thadani; Ngoc Le; Ronaldo Jenkins; Saba Saba; Thomas Boyce