ML20207S894
| ML20207S894 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/12/1987 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20207S889 | List: |
| References | |
| NUDOCS 8703200378 | |
| Download: ML20207S894 (3) | |
Text
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UNITED STATES f"
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-SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION
' SUPPORTING AMENDMENT NO.iooTO FACILITY OPERATING LICENSE NO. NPF-3 TOLEDO EDISON COMPANY AND THE CLEVELAND ELECTRIC ILLUMINATING COMPANY DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 DOCKET NO. 50-346 INTRODUCTION By letter dated January 21, 1987, Toledo Edison Company, the licensee, made application for amendment to Facility Operating License No. NPF-3 for the Davis-Besse Nuclear Power Station, Unit No. 1.
The proposed amendment would change the Technical Specifications (TSs) for the Davis-Besse Nuclear Power Station, Unit No. 1, relating to the D.C. distribution system during operation and while shutdown (Sections 3/4 8.2.3 and 3/4 8.2.4).
The proposed changes are based mostly on the guidance provided in an improved set of standard Technical Specifications (STSs) that was sent to Toled6 Edison July 16, 1981 (T.M. Novak to R. P. Crouse). The proposed changes also include some minor
-rewording of riomenclature for clarification.
EVALUATION The objective of surveillance of the D.C. distribution system and its associated batteries and battery chargers is to ensure sufficient capacity and capability of the onsite D.C. power to meet its safety function. The existing TS surveillance requirements for this system are less conservative as compared to the requirements of the STSs. The proposed changes follow the same format, include the same words, parameters and their allowable values and limits as do the STSs. The proposed changes include surveillance requirements to verify at least once per seven days that battery electrolyte level and float voltage of the pilot cell and each connected cell are within their allowable values and limits. These requirements also include verification of battery specific gravity in each cell, as corrected for the electrolyte level and temperature, and verification that battery terminal voltage is equal to or greater than 129 volts on float charge. The test parameters, their limits and allowable values, and the action statement for exceeding the requirements are consistent with those of the STSs, and are, therefore, acceptable.
The proposed surveillance requirement of at least once per 91 days and within seven days after a battery discharge or overcharge includes verification of the values of the parameters tested above for a seven-day schedule. This i
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~ verification also includes electrolyte temperature of every sixth cell of the battery, and verification of no visible cor osion of connectors or terminals.
The proposed allowable values of these parameters are found consistent with those of the STSs, and are, therefore, acceptable.
The proposed changes add the requirements of measuring the resistance of each cell-to-cell and terminal connections at least once per 18 months and verifying it to be less than or equal to 150 x 10-6 ohms. The proposal also includes addition of performance-discharge test of battery capacity after an interval of 18 mortths during shutdown. This test shall be given to any degraded battery or to one which has reached 85% of its service life expected for the application.
These additions to the TSs are conservative and consistent with the STSs and are, therefore, acceptable.
The current TS requires the battery service test to verify operable status of the actual emergency D.C. loads for one hour when the battery is supplying 600 amps. This requirement was not specific with regard to the duty cycle (short time and long time loads). The proposed change requires the battery to be subjected to the service test for the design duty cycle as required by Regulatory Guide 1.129. This change is consistent with the STSs and is, therefore, acceptable.
l' The current TS requires that the station batteries be subjected to perfomance-discharge test at least once every 60 months, subsequent to the satisfactory completion of the battery service. test which is conducted every 18 months.
The proposed change requires the performance-discharge test to be conducted in lieu of the battery service test. The change is consistent with the STS's j
and is, therefore, acceptable.
STATE CONSULTATION i
In accordance with 10 CFR 50.91(b), we have fulfilled cur responsibilities with regard to consultation with the State. The State was contacted on February 12, 1987, and had no comments.
ENVIRONMENTAL CONSIDERATION This amendment involves a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.
We have determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure. The Comission has previously issued a proposed finding that this amendment involves no significant hazards consideration and there has been no public comment on such finding. Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of this amendment.
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. CONCLUSION We have concluded, based on the considerations discussed above, that: (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (?) such activities will be conducted in compliance with the Connission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Dated: March 12, 1987 Principal Contributor:
Iqbal Ahmed l
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