ML20116M568
| ML20116M568 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 11/12/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20116M567 | List: |
| References | |
| NUDOCS 9211200412 | |
| Download: ML20116M568 (2) | |
Text
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c UNITED STATES j
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NUCLEAR REGULATORY COMMISSION F
WASHINGTON, D.C. 3ppe SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION, RELATED TO AMENDMENT NO.189 TO FACILITY OPERATING LICENSE NO. DPR-49 IOWA ELECTRIC LIGHT AND POWER COMPANY CENTRAL IOWA POWER COOPERATIVE CORN BELT POWEk COOPERATIVE DUANE ARNOLD ENERGY CENTER DOCKET NO. 50-331 1.0 INTRODUCIlQN By letter dated May 28, 1992, the licensee requested changes to its Technical Specifications (TS) to modify the diesel generator surveillance requirements by reducing testing of the operable diesel generator when the other diesel generator is inoperable.
2.0 ECLUATION Section 4.5.G of the Duane Arnold Energy Center (DAEC)ining diesel generator TS currently requires that when one diesel generator is inoperable, the rema must be demonstrated to be operable within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and daily thereafter. The requested change modiries this surveillance requirement and would require demonstration of operability of the operable diesel generator within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the determination that the other diesel generator is inoperable and every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereafter.
This periodicity of testing may continue for up to 7 days.
Testing diesel generators to prove operability ct-ause accelerated wear that shortens equiment life and decreases reliabilit Although increased testit,
provides the senefit of a decreased potential for an undetected failure, the increased unavailability of the equipment while it is in the test mode or undergoing repairs for test-induced failures are undesirable effects of excessive testing.
'he initial testing within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allows adequate time to pursue the completion of repairs to return the inoperable machine to operable status, and also provides assurance within a reasonable amount of time that the cause of one machine being inoperable is not a common failure mechanism affecting both machines. The 24-hour time period is consistent with recossmendations of Generic Letter 84-15.
In addition, the testing of the operable diesel generator every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereafter provides added assurance that this diesel l
generator will continue to be available.
1 The staff has reviewed the licensee's submittal which requests a revision to l
its TS to modify the diesel generator surveillance requirements by reducing testing of the operable diesel generator when the other diesel generator is inoperable.
Based on its review, the staff concludes that the regee ted change is acceptable.
9211200412 921112 DR ADOCK 0500 1
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3.0 STATE CONSULTATION
in accordance with the Commission's regulations, the Iowa State official was notified of the proposed issuance of the amendment.
The Sta's official had no comments.
4.0 ENVIRONMENTAL CD!illDERATIONS This amendment involves a change to a requirement with respect to the instal-lation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 or a change to a surveillance requirement. The staff has 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 Commission has previously issued a proposed finding that this amendment involves no si nificant hazards considerationandtherehasbeennopubliccommentonsuchffnding(57FR 32574). 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 im)act statement or environmental assessment need be prepared in conna: tion wit 1 the issuance of this amendment.
5.0 CONCLUSION
The staff has concluded, based nn 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 pro)osed manner, (2) such activities will be conducted in compliance wit 1 the Commission's regulations, and (3} the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
C. Y. Shiraki Date: tbvember 12, 1992
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