ML20147E334
| ML20147E334 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 01/13/1988 |
| From: | Firlit J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| AGM-NPP-87-497, TAC-67000, NUDOCS 8801210081 | |
| Download: ML20147E334 (2) | |
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esuun SACRAMENTO MUNICIPAL UTIUTY DISTRICT C 6201 S Sueet. P.o. Box 15830. Sacramento CA 95852 1830.1916) 452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA AGH/NPP 87-497 JM 131993 U. S. Nuclear Regulatory Commission Attn:
Frank J. Miraglia, Jr.
Associate Director for Projects Phillips Building 7920 Norfolk Avenue Bethesda, MD 20014 DOCKET NO. 50-312 RANCHO SECO NUCLEAR GENERATING STATION LICENSE NO. DPR-54 NUCLEAR SERVICE BATTERY TESTING
Dear Mr. Miraglia:
The original Rancho Seco 125V DC Nuclear Service Batteries were replaced during the current outage.
Preoperational testing on these new batteries and the other Nuclear Service Batteries has been completed.
The District considers that this testing demonstrates the operability of these batteries.
Attached for your information is a discussion of the testing completed and a comparison to the surveillance requirements in Proposed Amendment No. 164 and IEEE 450-1987.
Please contact me if you have any questions. Members of your staff with questions requiring additional information or clarification may cor. tact Mr. Robert Roehler at (209) 333-2935, extension 4918.
Sincerely, b
mkr Joseph F. Firlit Assistant General Manager, Nuclear Power Production Attachment cc-G. Kalman, NRC, Bethesda (w/atch)
A. D'Angelo, NRC, Rancho Seco (
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J. B. Hartin, NRC, Region V
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d ATTACMENT NUCLEAR SERVICE BATTERY TESTING Technical Specification 4.6.4 of Proposed Amendment No. 164 and ANSI /IEEE Std. 450-1987 require that the performance discharge test be performed in the "as found" condition, if the performance discharge test is done in lieu of the service test.
The results of testing in the "as found" condition reflect maintenance conditions.
The Nuclear Service Batteries include new batteries installed in the Auxiliary Building during the current outage and batteries previously (1983) installed in the Nuclear Service Electric Building (NSEB).
In March 1987, testing was performed on the NSEB batteries to verify their capability to supply the expected load profile.
The new auxiliary building batteries were service tested after installation (June 1986 through July 1987).
The service tests verified that the batteries were capable of supplying the expected load profile and demonstrated that the calculated battery response was more conservative than the actual response.
The service testing also verified that the method for calculating the load profile is conservative. Since this service testing was completed, additional loads have been added to the battery load profile.
Both the District and manufacturer have determined that the additional loads and revised load profile do not exceed the battery design limits.
The Nuclear Service Battery performance testing (discharge or capacity) for all batteries began in late September 1987 and was completed in early November 1987. Prior to testing, the fluid levels on the batteries were raised.
Based on the manufacturers instructions an equalizing charge was placed on the batteries to mix the electrolyte.
The batteries were tested between 3 to 5 days after the equalizing charge was completed.
A performance discharge test was completed for each battery to verify the manufacturer's rating. The capacity for the batteries was between 105 and 120 percent of the manufacturer's rating.
Since the service testing was performed late in 1986 and early in 1987, it may exceed the refueling interval time period in Technical Specifications, therefore, the District is basing the operability of the batteries on the performance discharge test.
Because the actual testing was performed 3 to 5 days after the maintenance was completed, the District has evaluated the testing to ensure it provides a basis for operability.
The manufacturer has confirmed that for these batteries the results of the discharge testing 4
verifies that the batteries would exceed 80 percent of the manufacturer's rating if they had been tested in the "as found" condition.
The District has determined that the testing performed demonstrates the operability of these batteries.
The service test will be performed during the next refueling outage and the discharge test will be performed at least once during the next 60 months as required by Proposed Amendment No. 164.
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