ML20128B384
| ML20128B384 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 05/13/1985 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20128B370 | List: |
| References | |
| NUDOCS 8505240513 | |
| Download: ML20128B384 (4) | |
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7590-01 UNITED STATES NUCLEAR REGULATORY COMMISSION IOWA ELECTRIC LIGHT AND POWER COMPANY DOCKET NO. 50-331 -
ENVIRONMENTAL ASSESSMENT AND FINDING OF NO SIGNIFICANT IMPACT The U. S. Nuclear Regulatory Commission (the Commission) is considering issuance of an exemption from the requirements of 10 CFR 50.48(c)(4) to the Iowa Electric Light and Power Company (the licensee),
for the Duane Arnold Energy Center (DAEC), located in Linn County, Iowa.
ENVIRONMENTAL ASSESSMENT Identif. cation of Proposed Action: The exemption would grant the licensee
.chedular deferment from the provisions of Appendix R, Sections III.G.3 and III.L. fire protection of the equipment used for safe shutdown
- capability, from the current Cycle 8 refueling outage to the restr.rt after the Cycle 9 refueling outage (expected in March 1987). The exe.nption is responsive to the licensee's application dated April 5, 1985.
l The Need for the Proposed Action: Appendix R,Section III.G requires a l
! licensee authorized to operate a nuclear power reactor to provide fire l
protection for equipment used for safe shutdown by means of separation and barriers or provide alternative safe shutdown capability.Section III.L requires that alternative and dedicated shutdown capability provided for specific fires shall be able to (a) achieve and maintain subcritical reactivity conditions in the reactor; (b) maintain reactor coolant inventory;(c)achieveandmaintainhotshutdown;(d)achieveco'dshutdown in 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; and (e) maintain the cold shutdown condition thereafter. The 8505240513 850513 PDR ADOCK 050 3p
o sc.hedular requirements of 10 CFR 50.48(c)(4) call for the implementation of modifications before startup after the earliest of the following events connencing 180 days after Connission approval:
(1) The first refueling outage; (2) Another planned outage th'it lasts for at least 60 days; or (3) An unplanned outage that lasts for at least 120 days.
In a submittal dated April 5, 1985, the licensee requested that the implementation schedule for the proposed fire protection modification at Duane Arnold Energy Center be exter.ded to permit the licensee to modify the Alternate Shutdown System so that the DAEC can achieve and maintain hot shutdown without any need to replace control power fuses. The licensee stated that the problem of possible less of fuses in the event of a fire was recently identified. Modification effort will involve adding automatic backup fuses to five transfer circuits. Such modifications are not p'o'ssible during the current refueling outage, which is scheduled to end in May 1985. The licensee states that the modification involves considerable design effort and requires the same engineers who are presently dedicated to the installation of the present alternate shutdown capability.
Additionally, the procurement of transfer switches is estimated by the licensee to take about a year. s During the interim period between the current and the next refueling )
l outage, the licensee has proposed to write procedures to require the operators to replace blown fuses if required as a result of a fire.
Additionally, the licensee has proposed to assure that the replacement L.
p fuses will be available to operators. These measures are being evaluated
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by the staff.
Environmental Impacts of the Proposed Action: By using reasonable interim compensatory measures, the proposed exemption will provide a degree of fire protection such that there is no significant increase in the risk to this facility. Consequently, the probability of fires has not been increased and the post-fire radiological releases will not be greater than previously determined nor does the proposed exemption otherwise affect radiological plant effluents. Therefore, the Commission concludes that there are no significant radiological environmental impacts associated with this proposed exemption.
With regard to potential non-radiological impacts, the proposed exemption involves features located entirely within the restricted area as defined in 10 CFR Part 20. It does not affect non-radiological plant effluents and has no other environmental impact. Therefore, the Commission concludes that there are no significant non-radiological environmental
( impacts associated with the proposed exemption.
Alternative Use of Resources: This action involves no use of resources not I previously considered in the Final Environmental Statement dated March 1973 for the Duane Arnold Energy Center.
Agencies and Persons Consulted: The NRC staff reviewed the licensee's request and did not consult other agencies or persons.
FINDING OF NO SIGNIFICANT IMPACT The Commission has determined not to prepare an environmental impact statement for the proposed exemption.
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. Based on the foregoing environmental assessment, we conclude that the proposed action will not have a significant effect on the quality of the human environment.
For.further details with respect _to this action, see the application for the exemption dated April 5,1985, which is available for public inspection at the Connission's Public Document Room,1717 H Street, N. W.,
Washington, D.-C., and at the Cedar Rapids Public Library, 500 First Street. S. E., Cedar Rapids, Iowa 52401.
Dated 'at Bethesda,- Maryland, this 13th day of May, 1985 FOR THE NUCLEAR REGULATORY COMMISSION Gus C. Lainas, Assistant Director for Operating Reactors Division of Licensing 1
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