ML20149G198

Proposed Tech Spec Page 274 Re 125-volt Battery Testing

ML20149G198
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	02/11/1988
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20149F759	List: ML20149F756 ML20149G198
References
4223K, NUDOCS 8802180166
Download: ML20149G198 (2)

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O.15 Diesel Generators The qualification testing of the diesel generator is designed to establish a 0.99' reliability with.a confidence level of 95%. This testing is described in response to Question 8.22 of the FSAR and has been accepted by the Directorate of Licensing. (1) h monthly testing of the diesel generators is conducted to_.

seet the intent of Section 6.4.1 of IEEE Trial-Use Standard 387-1972.and demonstrates the continued

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availability of the diesel generators. The diesel generator will be manually started and loaded to,4000 EU as recomunended by the manufacturer; this load will be maintained until operating temperatures are normallred. In conjunction with this testing, the diesel starting air compressors and the diesel oil' transfer pumps are also tested to demonstrate their continued availability.

The refueling outage testing is conducted to meet the intent of Section 6.4.2 of IEEE Trial-Use Standard 387-1972 and demonstrates the continued capability of the diesel generators to perform their functions. In ,

conjunction with this testing, tests are also perforined on the diesel, starting air compressors and the diesel oil transfer pumps to demonstrate their continued capability to perforia their functions. N performance criteria for the air compressors is based on the acceptance standards for the system; the criteria for the diesel oil transfer pumps is based upon supplying fuel at a rate greater than the maximum rate of consumption of the diesel.

Batteries Station batteries can be expected to deteriorate with time but precipibus failure is extremely unlikely.

The type of weekly and quarterly surveillance specified has demonstrated over the years the ability to detect indications of a cell becoming irregular or unserviceable long before it fails. .The periodic equalizing charge will ensure that the ampere-hour capacity of the batteries is maintained.

Each refueling outage the batteries are visually inspected and subjected to a discharge perforiaance test or service test as reconumended by IEEE Std. 450-1980, "IEEE Recomumended practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations," to ensure that the battery has :saintained its required capacity. Following this discharge test the battery is restored to the fully charned condition. In addition, a performance test is conducted on the battery charger to verify its i ability to supply sufficient amperage to recharge a battery and also supply normal loads. (2) 1 The tests described above are proven power plant practice and will ensure the continued availability of the battery as well as its continued capability to carry design load.

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' (1) Section 8.3.1 of Safety Evaluation by the Directorate of Licensing, U.S.A.E.C., in the Matter of Comunonwealth Edison Company Zion Nuclear power Station Units 1 and 2 Docket Nos 50-295 and 50-304, dated October 6, 1972 (3) FSAR Section 8.4.1.4 I

274 8802180166 880211 PDR ADOCK 05000295 P PDR 4223K J

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ATTACNENT 2 DESCRIPTION OF PROPOSED AME W Technical Specification 4.15.1.E is be!.ng modified to incorporate the requirement that a Battery Service Test be performed every refueling on the 125 volt station batteries per IEEE 450-1980. This service test is designed to more directly verify a battery's ability to supply its emergency loads.

This is in contrast to the determination of overall battery capacity that is provided by the results of a Performance Discharge Test.

A cabular comparison of the proposed amendment is provided below.

The performance Discharge Test is proposed to be performed every 60 months, as opposed to the current refueling frequency. Iri its place, the Battery Service Test described above will be performed every refueling. These elements are consistent with those of MUREG-0452, Rev. 4. (STS).

Existing Proposed Standardized Technical Amendment Technical Specifications specifications No Requirement Every Every 18 months, Battery unless PDT performed Refueling, unless Service Test PDT performed (IEEE 450-1980) (IEEE 450-1980)

Ferformance Every 60 months, Discharge Every Refueling Every 60 months, after degradation, after degradation, Test or 85% of life.

or 85% of life.

10% capacity loss 10% capacity loss Definition Not addressed or 90% performance.

of or 90% performance, Degradation 4223K