ML040770247

Draft Information Inputs Preliminary RAI DC Electrical Power Technical Specifications Changes Pursuant to TSTF 360 - Attachment 7

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: ML040770226 ML040770235 ML040770247 ML040770253 ML040770256 ML040770261 ML040770265 ML040770270 ML040770274 ML040820903
References
LAR 02-06, TAC MB9532, TAC MB9533
Download: ML040770247 (4)

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Preliminary Request fir Additional Informiation Creation Date: 1/22/04 2:5 1PM From: Mohan Thadani Created By: MCT~nrc.gov Recipients Action Date & Time txu.corn Transferred 01/22/04 02:52PM ccorbin CC (Intemet:ccorbin @txu.com) rwalker5 (Internet:rvalker5 @txu.com) fred Transferred 0 1/22/04 02:52PM madden CC (Internetffred.madden @txu.com) nrc.gov owf2-po.OWFNDO Delivered 0 1/22/04 02:5 1PM RVJ CC (Ronaldo Jenkins) Opened 01/22/04 03:17PM SNS1I CC (Saba Saba) Opened 01/23/04 07:19AM nrc.gov owf4..po.OWFN_-DO Delivered 0 1/22/04 02:511PM MCT CC (Mohan Thadani) Opened 01/22/04 02:52PM NBL CC (Ngoc Le) nrc.gov owf5-po.OWFNDO Delivered 01/22/04 02:52PM THB CC (Thomas Boyce) Opened 01/22/04 02:57PM txu.com. Transferred 01/22/04 02:52PM dbuschbl. CC (Internet:dbuschbl @txu.com)

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- , .. .. .. ... ... F - . - - ^ . : .... .. > _ .... ... .. - - . - = .- . - I__ AT -; _ M ... . ^ _ _ . 5 i Mohan Thadani - Preliminary Request fir Additional Information l . . ... .. . . . - _ Page 1 From: Mohan Thadani To: Intemet:rwalker5@txu.com

- -bte: 1/22/04 2:5IPM

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

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charger to handle transient loading requirements caused by the re-alignment of the AC sources

'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