ML17297A578
| ML17297A578 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 07/15/1981 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| ANPP-18410-JMA, NUDOCS 8107220230 | |
| Download: ML17297A578 (8) | |
Text
REGULATOR INFORMATION Dl'STRIBUTXON TEM (RIDS)
ACCESSION> NBR;8107220230, DOC ~ DATEi: 81/07/15 NOTARIZED: ~ NO DOCKEi ;
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Assistant Director for Licensing SUBJECT!: Responds to draft-SER input re DC power sys+Battery high discharge rate alarm not" necessary'ero ctr ammeter for batter fesrchar ger-output current ammeterEchar ger output voltmeter F undervoltage, alarm provide same intent es alarm',
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P. 0 BOX ZI666 PHOENIX'RIZONA 85036 July 15, 1981.
ANPP-18410 - JMA/WFQ Mr. R. L. Tedesco Assistant Director of Licensing Division of Licensing U.S. Nuclear Regulatory Commission Washington, D. C.
20555 PsSs rIUCIVII IImuurOSr COMMISS lOH
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Subject:
References:
Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2 and 3
'ocket Nos. STN-50-528/529/530 (1)
Letter from R. Tedesco, NRC, to E.
E.
Van Brunt, Jr. dated June 16, 1981, subject:
Draft Safety Evalu-ation Report (SER) Input for DC Power Systems (2)
ANPP-16894 - JMA/WFg dated December 18, 1980
Dear Sir:
Our response to the referenced draft Safety Evaluation Report is as follows.
NRC Re uirement Provide battery high discharge rate alarm to alert the operator that the loads are being supplied by the batteries and the batteries are discharging at an abnormal rate.
~Res ense A battery high discharge rate alarm is not necessary.
The zero center ammeter for batteries, the charger output current ammeter, the charger out-put voltmeter and undervoltage alarm set five volts below the float voltage level (130V), charger malfunction alarm, all in the control room, provide the same intent as a discharge rate alarm, and assure that the battery is not discharged without the operator's knowledge.
Single line drawings 13-E-PKA-002, 004, 005, and 007 showing these status monitoring devices were previously submitted by Reference (2).
Also, assuming the charger malfunctions during DBE, the battery duty cycle will have different dis-charge rates at different periods and it will be difficult to differentiate between high discharge rate and abnormal high discharge rate.
In addition, goes
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Mr. R. L. Tedesco Jiily 15, 1981 ANPP-18410 - JMA/WFg Page 2
as a result of an investigation of this matter by our A/E, we are unaware of any quality Class lE battery discharge rate alarm available in the market which would suitably meet'this requirement.
NRC Re'uir'ement Provide battery breaker open, alarm in the control room.
~Res onse The PVNGS design will incorporate a battery breaker open:alarm in the con-trol room.
Revised drawings incorporating this control room alarm have been made.
The FSAR will be revised as appropriate to indi.cate the existance of this alarm.
NRC'Re ui rement It is not clear from the information provided if the Class lE direct current system is adequately qualified to preclude potential damage due to battery charger regulator failure (does not include built-in overvoltage shutdown protection) and that the Class lE dir'ect current equipment is qualified for operation at the equalizing charge voltages.
~Res onse The requirement of Class lE direct current equipment to operate at 140V (equalizing charge voltages) has always been*specified in the Project Design Criteria and Specifications.
We intend to incorporate the requirement of charger-overvoltage initiated shutdown capability by using'one of the following alternatives:
1.
We are discussing with our vendor the deletion of the overvoltage alarm capability and utilization of the DC high voltage sensing relay in the charger's AC input breaker shunt trip circuit.
This would trip the AC input breaker in the event of DC overvoltage.
2.
We are investigating the addition of an external DC overvoltage relay on the bus to which the charger is connected, which would trip either the charger AC input breaker or the DC output breaker connecting the charger to the bus.
This would avoid the problem associated with the first potential solution, the loss of over-voltage alarm capability, and would minimize the impact upon equip-ment qualification.
Mr. R. L. Tedesco July 15, 1981 ANPP-18410 JMA/WFg Page 3
We consider it is appropriate to establish whether or not these responses are satisfactory to the NRC staff, or more specifically, whether the NRC staff has sufficient information and understanding to close all open items listed for the draft DC system SER.
If your staff has any questions, please raise them promptly so that they can be closed out completely and expeditiously.
Very truly y rs, G~ n~
E.
E.
Van Brunt, Jr.
APS Vice President, Nuclear Projects ANPP Project Director EEVBJr/WFg/av cc:
J.
Kerrigan P. Hourihan B. Myerson
- 0. Chopra A. C. Gehr
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