ML20210V559
| ML20210V559 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/03/1986 |
| From: | Mcneil S Office of Nuclear Reactor Regulation |
| To: | Tiernan J BALTIMORE GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8610100730 | |
| Download: ML20210V559 (4) | |
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October 3, 1986 Distribution Docket Nos. 50-317 (Docket > File {"TSA.McNeil and 50-318
'NRC PDR"'"" " PKreutzer
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PBD8 Reading NThompson Mr. J. A. Tiernan FMiraglia OGC-Bethesda Vice President - Nuclear Energy EJordan
. Baltimore Gas & Electric Company BGrimes P. O. Box 1475 JPartlow Baltimore, Maryland 21203 Gray File 3.2a
Dear Mr. Tiernan:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - APRIL 14, 1986 STATION BATTERY TECHNICAL SPECIFICATION AMENDMENT REQUEST Baltimore Gas and Electric Company (BG&E) has requested via the application dated April 14, 1986 that changes be made to Technical Specification 3/4.8.2, "Onsite Power Distribution Systems," concerning the Action Statements and Surveillance Requirements applicable to the station batteries. We have evaluated the licensee's justification of the proposed changes on their own merits and/or against the requirements set forth in IEEE Standard 450,
" Recommended Practice For Maintenance, Testing and Replacement of Large Lead Storage Batteries for Generating Stations and Substations," as augmented by the positions set forth in Regulatory Guide 1.129, " Maintenance, Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants."
We have determined that additional information is required to complete our review of your amendment request.
Our request for additional information is enclosed.
This request for additional information affects fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely,
/S,/
Scott Alexander McNeil, Project Manager PWR Project Directorate #8 Division of PWR Licensing-B
Enclosure:
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Baltimore Gas & Electric Company Calvert Cliffs Nuclear Power Plant cc:
Mr. William T. Bowen, President Regional Administrator, Region I Calvert County Board of U.S. Nuclear Regulatory Commission Commissioners Office of Executive Director Prince Frederick, Maryland 20768 for Operations 631 Park Avenue D. A. Brune, Esq.
King of Prussia, Pennys1vania 19406 General Counsel Baltimore Gas and Electric Company P. O. Box 1475 Baltimore, Maryland 21203 Jay E. Silberg Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.W.
Washington, DC 20037 Mr. M. E. Bowman, General Supervisor Technical Services Engineering Calvert Cliffs Nuclear Power Plant MD Rts 2 & 4, P. O. Box 1535 Lusby, Maryland 20657-0073 Resident Inspector c/o U.S. Nuclear Regulatory Commission P. O. Box 437 Lusby, Maryland 20657-0073 Bechtel Power Corporation ATTN:
Mr. D. E. Stewart Calvert Cliffs Project Engineer 15740 Shady Grove Road Gaithersburg, Maryland 20760 l
Combustion Engineering, Inc.
ATTN:
Mr. W. R. Horlacher, III Project Manager P. O. Box 500 1000 Prospect Hill Road Windsor, Connecticut 06095-0500 Department of Natural Resources Energy Administration, Power Plant i
Siting Program ATTN: Mr. T. Magette Tawes State Office Building Annapolis, Maryland 21204 l
D REQUEST FOR ADDITIONAL INFORMATION BALTIMORE GAS AND ELECTRIC COMPANY CALVERT CLIFFS NUCLEAR POWER PLANT, UNITS 1 AND 2 APRIL 14, 1986 STATION BATTERY TECHNICAL SPECIFICATION AMENDMENT REQUEST 1.
The acceptability of the proposal to establish less restrictive cell electrolyte level limits is predicated on a satisfactory staff evcluation of the physical design of the cell regarding the relative positions of the cell fiduciary marks.
This evaluation will also address the adequacy of the proposed limits if the cells are provided with flame-arresting vents (see Page 14, section D1, Appendix D of IEEE STD-450).
Provide a description or drawing of the physical design of the station battery.
Include the following points of reference:
a.
top of the cell b.
top of the cell plates c.
maximum electrolyte level indication mark d.
minimum electrolyte level indication mark orifice position in the funnel stem of the flame arresting vent e.
f.
proposed short-term high and low electrolyte level limits g.
proposed long-term high and low electrolyte level limits Describe the design basis of the cells' maximum and minimum electrolyte level indication marks and any effects (physical, chemical, or electrical) on the battery which occur from' permitting the electrolyte level range to be expanded.
2.
The information submitted to support the lowering of the individual cell voltage (ICV) from 2.10 to 2.07 volts during short-term operation is insufficient to establish the acceptability of this requested change.
Information should be provided demonstrating that the allowable value of 2.07 volts per cell is appropriate for the station batteries' design application, as related to the continuous or intermittent operation of the cells at this voltage.
It is recognized that the life expectancy of the cells is improved by raising the long-term operation limit of all l
cells to 2.13 volts, as proposed by the licensee.
i Additional changes were proposed in the limits for individual cell 4
specific gravity (s.g.) during the short and long-term mode of operation; and for the average s.g. of all cells during the short-term mode of operation.
It is also recognized that the life expectancy is improved by raising the long-term operation limit for average electrolyte s.g. to 1.205, as proposed by the licensee.
To permit the staff to place this proposed change in the proper perspective, the anticipated amount of time the cells would be in the short-term operating mode for a given 18-month period must be established.
Describe the events that could result in an ICV of less than 2.10 volts or an s.g. of less than 1.200.
Provide an estimate of the amount of time that the ICV's will be less than 2.10 volts and/or the s.g.'s will be less than 1.200 during an 18-month period.
. I i
3.
The licensee requested the deletion of current requirements that limit the amount of ICV and s.g. decrease since the last performance discharge test and last s.g. measurement.
The justification for this deletion was on the basis that a better indication of overall battery capability is the deviation from the full charge s.g.
Also, limits on these deviations were proposed as part of this request to change TS.
We concur with the licensee's justification in principle.
However, in view of the fact that the battery capacity is only checked every 18 months, the detection of degradation of cell capacity through detection of deviations from previous values of ICV and cell s.g. in advance of the next performance discharge test reduces the probability that the battery will reach, undetected, a state where its capacity is less than required.
We request you provide the basis and rationale to demonstrate that the trending of ICV and s.g. deviations is not necessary to detect overall battery capacity degradation below the minim'um acceptable level during the period between consecutive performance discharge tests.
4.
The licensee has stated that even if the individual cells' s.g.'s were
.04 below 1.215, the Calvert Cliffs batteries will have sufficient capacity remaining for the design duty cycle, since the total ampere-hours demanded during the design duty cycle is less than one half of the design capacity of the cells.
In this regard, provide a description comparing the design duty cycle to the design battery capacity in ampere-hours.
Provide a quantitative description (and its basis) of the rela-tionship of s.g. to battery capacity for your station battery including your battery capacity at s.g.'s of 1.195 and 1.175.
5.
This proposal requested the deletion of the dummy load profile, used to simulate the design duty cycle during battery service tests.
It is not clear from the information submitted what will be used in lieu of the dummy load profile to verify that the battery capacity is adequate to supply t,he required loads during battery service tests.
State how the dummy load profile will be described and controlled in the FSAR, including its relationship to the battery duty cycle and to the duty cycle load survey.
Describe how the dummy load profile will be controlled in the interim until completion of the ongoing duty cycle load survey.
6.
Provide the basis of the correlation of a charging current of less than 2 amperes when on a charge to an average s.g. of all connected cells of greater than or equal to 1.195.