ML20087N627
| ML20087N627 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/19/1984 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20087N626 | List: |
| References | |
| NUDOCS 8404040108 | |
| Download: ML20087N627 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION j
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E SAFETY EVALUATION
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AMENDMENT NO. 16 TO NPF-11 1
LA SALLE COUNTY STATION, UNIT 1 l
DOCKET NO. 50-373
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Introduction g
2 By letter dated December 9,1983 and as modified by letter of January 11, 1984, Commonwealth Edison Company (the licensee) proposed an F
amendment that would change the La Salle Unit 1 Technical Specification 8
requirements for fast starts on the diesel generators, consistent with the 3
provisions of the La Salle Unit 2 Technical Specifications.
The Technical i
Specification changes involve reduction in the number of required fast cold
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start surveillance testing of diesel generators. All surveillance testing not required to be performed at a fast cold start will be preceded by an engine prelube period and/or other warning procedures recomended by the 6
diesel generator manufacturer.
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Evaluation The NRC staff has for some time had under review and assessment the method 4
of diesel generator testing. The present method of testing does not take
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into consideration those manufacturer recommended preparatory actions such j
as prelubrication and all moving parts and warm-up procedures which are y
necessary to reduce engine wear, extend life and improve availability. The j
existing Technical Specifications require cold fast starts for surveillance testing which in many engine designs and operating practices subject the n-
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diesel engine to undue wear and stress on engine parts. Nuclear industry related groups such as Institute of Nuclear Power Operations and American L
Nuclear Insurer have expressed concern based on operation experience that T
cold fast start testing results in incremental degradation of diesel in engines and that, if proper procedures covering warm-up prelubrication, loading / unloading, etc. were taken, an improvement in reliability and h
availability would be gained. While the requirements for cold fast starts 4
is based on the emergency diesel generator's functional requirements in C
response to a loss-of-coolant accident coincident with a loss-of-offsite I
power, recent analyses by the staff indicate that two fast starts per year g
is a sufficient number to assure the required diesel generator reliability g
under design basis conditions. Thus, it is the NRC staff's technical t
jud,gement that an overall improvement in diesel engine reliability and i
availability can be gained by perfonning diesel generator starts for E
surveillance testing using engine prelube and other manufacturer j
recommended procedures to reduce engine stress and wear.
E 14 8404040108 840319 PDR ADOCK 05000373 g
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e The licensee has requested that the Technical Specification be changed in order to minimize the mechanical stress and wear on the diesel generators in that the fast starts will be required on a semi-annual basis.
This is consistent with the NRC staff resolution of the fast cold start issue. The number and period of surveillance tests specified in the Technical Specifications remain unchanged.
It is also the NRC staff's conclusion that the reliability of the diesels as detemined will be improved by these improved testing methods.
Environmental Consideration l
We have determined that this amendment does not authorize a change in effluent types or total amount nor an increase in power level and will not result in any significant environmental impact. Having made this determination, we have further concluded that this amendment involves action which is insignificant from the standpoint of environmental impact, and pursuant to 10 CFR Section 51.5(d)(4), that an environmental impact statement or negative declaration and enviromental impact appraisal need not be prepared in connection with the issuance of this amendment.
Conclusion We have concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the will not be endangered by operation in the proposed manner, and (2) public such activities will be conducted in compliance with the Commission'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 19,1984 l
- SEE PREVIOUS CONCURRENCES.
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