ML20059E924
| ML20059E924 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 09/05/1990 |
| From: | Hannon J Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20059E928 | List: |
| References | |
| NUDOCS 9009110005 | |
| Download: ML20059E924 (4) | |
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j 7590-01 UNITED STATES NUCLEAR REGULATORY COMMISSION UNION ELECTRIC COMPANY 00CKET NO. 50-4s3 l
ENVIRONMENTAL ASSESSMENT AND FINDING OF N0 SIGNIFICANT IMPACT The U. !;. Nuclear Regulatory Lanuif ssion (the Commission) is considering issuance of av amendment to Facility Operating License No. NPF-30, issued to Union Electric Company, (the licensee), for operation of the Callaway Plant, located in Callaway County, Missouri.
ENVIRONMENTAL ASSESSMENT Identification of Proposed Action The proposed amendment would include revisions to the Technical Specification Tables 2.2-1, 3.3-4 and 4.3-1 and associated Bases to accommodate theproposedreplacementofthecurrentResistanceTemperatureDetector(RTD) bypass system with an RTD/thermowell system mounted directly into the hot and i
cold legs of the reactor coolant system.
t The proposed action is in accordance with the licensee's application for amendment dated April 12, 1990, as supplemented by a letter dated July 7,1990.
_The Need for the Proposed Action Experience has demonstrated that the current RT3 bypass design has two
'ignificant drawbacks:
(1) Lack of Reliability:
Plant shutdowns have been required due to leakage from equipment related to the RTD bypass manifold arrangement or because of flow reductions in the bypass piping due to valve problems.
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2-(2) High Radiation Dose: A significant number of crud traps exist in the bynass piping, resulting in increased Man-rem accumulation while work it being 'done on or near the RTD bypass manifold system.
The proposed RTD system would eliminate all the bypass' piping and its 1
i associated problems while providing the capability of replacing RTDs without i
draining down the r2 actor coolant system.
Environmental-Impacts of the Propot,ed Action The Commission has completed its evaluation o' the proposed revision to the TSs. The proposed amendment would ace'uodate the: replacement of the current RTD '
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bypass system with an RTD/ti.ennowell system nounted directly into the hot and cold i
legs of the reactor coolant system. The replacement of the current RTD bypass system with a direct measurement RTD system with its subsequent removal of the bypass manifold piping would not significantly increase the probability or consequences of any accidents previously analyzed. No significant changes in the s
.q types or amounts of radblogical effluents during normal operation'or postulated accidents that may be released offsite are incurred by this' proposed modification.
As a result, no significant increase in the individual or cumulative occupat ka '
radiation exposure is noted.
refore, since the proposed changes do not increase the probability or consequenus of accidents, no changes are being mace in the types or amounts.of any radiological efflents.that may be released offsite, and there is no significant increase in the alicwable individua1> orcumulative occupatienal radiation exposure, the Commission concludes that this proposed action woulo result in no significant ridiological environmental impact.
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t The Notice of Conside") tion of Issuance of.'mendment and Opportunity for HearinginconnectionwiththisactionwaspublishedintheFederja Register on June 14, 1990 (55 FR 24172).
No request'for hearing or petition for leave to intervene was filed following this notice.
With regard to potential nonradiological impacts, the proposed' change to the TS involves a system located within the restricted area as defined by 10 CFR Part 20.
The proposed change will not result in a measurable change to the-nonradiological plant eftluents and therefore will not have any environmental impact. Therefore, the Commission concludes that there 4re no si i,lficant 9
nonradiological environmental impacts associated.with the proposed amendment.
Alternative to the. Propos 1 Action Since the Commission concluded that there are no significant environmental effects that would result from the proposed action, any alternatives with' equal or greater environmental-tmpacts need not be evaluated. The principal-alterna-tive would be to deny the iaquested amendment. Th : would not reduce environ-mental impacts of plant operation and would resu;t in reduced operational flexibility.
Alternative Use of Resources This action does not involve the use of any resources not previously-considered in the Final Environmental Statements for the Callaway-Plent dated q
January 1982.
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Agencies and Persons Consulted t
The NRC staff reviewed the licensee's request and did not consult other agencies or persons.
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FINDING OF NO SIGNIFICANT IMPACT The Commission has determined not to prepare an environmental impact statement for the proposed license amendment.
Based upon the f.oregoing environmental assessment, we conclude that thei 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 i
amendment dated April 12, 1990 and supplement dated July 7, 1990, which are l
available for public inspection at the Commission's Public Document-Room, 2120'l Street, N.W., Washington, D.C.. and at the. Callaway County Public Library, 710 Court Street, Fulton, Missouri 65251 and the John M. Olin Library,-
i Washington University, Skinker and Lindell Boulevards, St. Louis, Missouri 63130.
Dated at Rockville, Maryland, this 5th day of September 1990.
1 FOR THE NUCLEAR REGULATORY COMMISSION A
Ah John N. Hannon, Director Project birettorate III-3 Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation
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