ML20036B789
| ML20036B789 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 05/26/1993 |
| From: | Simpkin T COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20036B790 | List: |
| References | |
| NUDOCS 9306020341 | |
| Download: ML20036B789 (5) | |
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C:mmonw alth Edbtn
) 1400 Opus Place O
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Downers Grove, lltinois 60515 B
May 26,1993 i
Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555
- Attn:
Document Control Desk
Subject:
Zion Station Units 1 and 2
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Application for Amendment to Facility Operating License DPR 39 & 48 NRC Docket Nos. 50-295 & 50-304
Dear Dr. Murley:
Pursuant to 10 CFR 50.90, Commonwealth Edison (CECO) proposes to amend Appendix A, Technical Specification of Facility Operating Licenses DPR-39 and DPR-48.
The proposed amendment revises specification 4.15.1.E.2 to relocate the requirement to perform a quarterly equalization charge of the DC battery to licensee control.
A detailed description of the proposed change is presented in Attachment A. The q
revised Technical Specification pages are contained in Attachment B.
The proposed changes has been reviewed and :pproved by both on-site and off-site review in accordance with CECO procedures. CECO has reviewed this proposed amendment in accordance with 10 CFR 50.92 {c) and has determined that no significant hazards consideration exists. This evaluation is documented in Attachment C. - An Environmental Assessment has been completed and is contained in Attaclunent D.
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CECO is notifying the State of Illinois of our application for this amendment by l
transmitting a copy of this letter and its attachments to the designated State Official.
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l 9306020341 930526 PDR ADDCK.05000295 P
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't Dr. Murley May 26,1993 To the best of my knowledge and belief the statements contained herein are true and correct. In some respects, these statements are not based on my personal knowledge but upon information received from other Commonwealth Edison and contractor employees. Such information has been reviewed in accordance with Company practice and I belive it to be reliable.
Please direct any questions regarding this matter to this office.
Sincerely, qja.
T.W. Simpkin Nuclear Licensing Administrator Attachments cc: C. Shiraki, Project Manager - NRR J.D. Smith, Senior Resident Inspector - Zion Document Control Desk - NRR Region III Office Office of Nuclear Facility Safety - IDNS d'#A Stateoff County of Signed before me on this N ay of/#11 19M by N#N
/ 6' Notary Public
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S ANDR A C. L AR A NOTARY PUBUC STATE OF ILUN0!S.
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ATTACHMENT A l
ZION NUCLEAR GENERATING STATION l
DESCRIPTION AND THE IMPACT OF THE PROPOSED TECHNICAL SPECIFICATION CHANGES r
FOR LICENSE AMENDMENT REQUEST NO. 93-94 l
i RELOCATION OF THE QUARTERLY 125 VDC BATTERY EQUALIZATION REQUIREMENT
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.l DESCRIPTION AND SAFETY ANALYSIS FOR l
LICENSE AMENDMENT REQUEST No. 93-04 RELOCATION OF THE QUARTERLY 125 VDC BATTERY EQUALIZATION REQUIREMENT
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!l A. DESCRIPTION OF THE PROPOSED CHANGE:
An amendment to the Technical Specifications for Zion Nuclear Station, Units 1 and 2, is requested to relocate the current Technical Specification requirement to perform quarterly equalization charges on the station 125 VDC batteries to licensee control. This change is requested as part of the implementation of the Generic Letter 91-18 philosophy regarding the operability of equipment undergoing surveillance testing. This change will permit the adjustment.
of equalization charge voltages and durations for the DC battery system. Under l
the current requirement, separation of the battery undergoing the equalization is required due to the equalization voltage required to support a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> charge (approximately 140 volts) being in excess of various equipment qualification voltages 1
(120 volts 10%) fed from the 125 VDC bus. By extending the equalization charge 1
duration, a much lower equalizing voltage can be applied. This allows the battery to l
be equalized without cross-tying it to the opposite unit thus, maintaining battery l
operability during roudne battery equalizations. Typical battery vendor
.i equalization voltage and duration recommendations for the type of batteries used at Zion Station are 131.7 volts for 166 hours0.00192 days <br />0.0461 hours <br />2.744709e-4 weeks <br />6.3163e-5 months <br />. Performing equalization charges at reduced voltages for longer periods of time allows the battery to remain connected to it's respective battery bus during equalization charges, maintains battery.
j operability, and reduces the potential for human error in switching operations.-
Further, the float voltage that Zion Station currently operates at may allow for i
significant reductions in the frequency of equalizing charges in accordance with 1
vendor recommendations.
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q B. CURRENT REQUIREMENTS:
i Zion Station Technical Specification 4.15.1.E.2 currently requires measurements to j
be taken on a quarterly basis for: the voltage of each cell to the nearest 0.01 volt, specific gravity of each cell, and temperature ' f every fifth cell. In addition, the o
electrolyte level is checked and adjusted as required, and all data is recorded including the amount of water added to any cell. After completion of these j
activities, the battery is then given a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> equalizing charge in accordance with 1
l this Technical Specification Surveillance Requirement.
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DESCRIPTION AND SAFETY ANALYSIS FOR LICENSE AMENDMENT REQUEST No. 93-04 RELOCATION OF THE QUARTERLY 125 VDC BATTERY EQUALIZATION REQUIREMENT y
C. REQUESTED REVISION:
.i Zion Station is requesting that the requirement to perform quarterly equalizations of the 125 VDC batteries be relocated from the Technical Specifications to licensee control, allowing control of equalization activities in accordance with the 10CFR 50.59 process.
As such, Technical Specification Surveillance Requirement 4.15.1.E.2 will be modified removing the requirement to perform quarterly equalizing charges. Reference to the performance of periodic equalizations will also be removed from the Bases consistent with the relocation of this requirement.
D. IMPACT OF THE PROPOSED CHANGE:
i By relocating the requirement to perform equalization charges to licensee control, i
battery equalization charges can be performed in accordance with vendor recommended frequencies and requirements. Battery equalization frequency, voltage, and times are dependent on numerous variables (i.e; float voltage, cell parameters, etc;). Based on the nature of these variables it is appropriate to allow for licensee' control of equalization charges. The periodic surveillance requirements specified in the Technical l
Specifications will continue to provide verification of battery condition, thus assurance
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of operability. Periodic monitoring of battery parameters provide the information necessary to evaluate the need to perform a battery equalization independent of a-specified equalization frequency within the Technical Specifications. As such, it is the intent of this change to perform equalization charges as required in accordance with vendor recommendations under the control of the 50.59 process. Allowing licensee control of equalization frequency and voltage requirements is consistent with the guidance contained in NUREG 0452, Westinghouse Standardized Technical Specifications, and NUREG 1431, Standard Technical Specifications, Westinghouse Plants.
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E. IMPLEMENTATION SCHEDULE:
I Zion Station is requesting that this change be issued prior to July 3,1993, in order to permit the adjustment of equalization voltages and duration -
with the next scheduled surveillance.
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