ML20012C872
| ML20012C872 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 03/19/1990 |
| From: | Jocelyn Craig Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20012C873 | List: |
| References | |
| NUDOCS 9003260033 | |
| Download: ML20012C872 (5) | |
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7590-01 UNITED STATES MUCLEAR REGULATORY COMMISSION I
ILLIN015 POWER COMPANY, ET AL.
DOCKET NO. 50-461 ENVIRONMENTAL ASSESSMENT AND FINDING 0F NO SIGNIFICANT IMPACT The U.S. Nuclear Regulatory Comission (the Commission) is considering l
issuanceofanamendmenttotheIllinoisPowerCompany(IP),andSoyland PowerCooperative,Inc.(thelicensees)fortheClintonPowerStation, Unit 1, located in DeWitt County, Illinois.
ENVIRONMENTAL ASSESSMENT Identification of Proposed Action:
The licensees have requested an amendment that would revise Technical Specification Table 3.3.7.5-1 to allow inoperability of primary containment isolation valve position indication when the valve / valve operator is electrically deactivated in the isolated position.
This revision to the Clinton Power Station's license would be made in response to the licensee's application for amendment dated February 5,1988.
The Need for the Proposed Action:
Pursuant to 10 CFR 50.50, IP, et al. have proposed an amendment to Facility Operating License No. NPF-62 which consists of changes to the Technical Specifications. Technical Specification Section 3.6.4 allows the deactivation of a Containment Isolation Valve in the isolated position as one method of providing acceptable containment isolation for a given penetration.
When this action is taken and a motor-operated CIV is electronically deacti-vated, its breaker is usually switched to the "0FF" position.
Consequently, l
power is lost to the position indication circuit and all position indication in JDR ADOCK0500g1 {@;
9003260033 900319 i
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i the main' control room is lost. However, Technical Specification Section 3.3.7.5 currently makes no provision for the loss of indication that occurs L
when the valve is electrically deactivated in the isolated position. The current ACTION reouires a' plant shutdown after 7 days if all position n
indication to a primary CIV is-lost. The intent of Technical Specification 3.3.7.5, with regard to CIV position indication, is to ensure that indication is available to control room operators for assessing containment integrity.
Thisintentcanbesatisfiediftheaffectedvalve(s)areplacedinthe isolated position prior to being deactivated and if appropriate administrative controls are in place to ensure that the control room operators can determine the valve's position if needed.
Intermittent opening of these valves under adeinistrative controls should also be allowed since such a provision is currently in Technical Specification 3.6.4.
Environmental Impacts of the Proposed Action:
The proposed change does not involve a significant increase in the prcbability or consequences of an accident previously evaluated because, ur.dtr theprovisionsoftheproposedchange,'theaffectedvalve(s)willbeinthe isolated /censervative position (except as limitedly provided). With the proposed change, a means still exists that allows plant operators to know the l
l positionofanaffectedcontainmentisolationvalve(s). The proposed change i-is consistent with the provisions of Technical Specification 3.6.4
" Containment Isolation Valves."
f The proposed change does not create the possibility of a new or different
. kind of accident from any accident previously evaluated because the proposed change introduces no new modes of operation with respect to existing
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requirements and provisions contained in the Technical Specifications. The proposed change does not involve any changes to the plant's as-built design.
The proposed change does not involve a significant reduction in a margin of safety because this change does not reduce the capability of assessing containment isniation during accident conditions or when otherwise required.
The Comission has determined that potential radiological releases during normal operations, transients, and for accidents would not be increased. With regard to non-radiological impacts, the proposed amendment involves systems located entirely within the restricted area as defined in 10 CFR Part 20. They do not affect non-radiological plant effluents and have no other environmental l
impact. They do not affect non-radiological plant effluents and have no other environmental impact. Therefore, the staff also concludes that there are no significent non-76diciogical environmental impacts. associated with the proposed amendment.
Accordingly, the Comission findings in the " Final Environmental Statement related to the operation of Clinton Power Station, Unit No. 1" dated May 1982 regarding radiological environmental impacts from the plant during normal operation or after accident conditions, are not adversely altered by this action.
IP is committed to operate Clinton, Unit 1 in accordance with standards and regulations to maintain occupational exposure levels "as low as reasonably achievable."
The Notice of Consideration of Issuance of Amendment and Opportunity for Hearing in connection with this action was published in the Federal Register on liay27,1988(53FR19359). No request for hearing or petition for leave to intervene was filed following this notice.
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Alternative to the Proposed Actions:
Since the Comission has concluded that there are no significant environmental effects that would result from the proposed action, any alternative with equal-or greater environmental impact need not be evaluated.
The principal alternative would be to deny the requested amendment.. This would not reduce environmental impacts of plant operation and would result in reduced operational flexibility.
Alternative Use of Resources:
This action does not involve the use of resources not previously considered in the Nuclehr Regulatory Comission's Final Environmental Statement for the Clinton Power Station, Unit 1, dated May 1982.
Acencies and Persons Consulted:
The NRC staff reviewed the licensees' request of February 5,1988 and did not consult other agencies or persons.
FINDING OF NO SIGNIFICANT IMPACT:
.The Commission has determined not to prepare an environmental impact statement of the proposed license amendment.
Based upon this environmental assessment, the Comission concludes 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 request for amendment dated February 5,1988 and the Final Environmental Statement for the Clinton Power Station dated May 1982, which are available for public inspection at the Commission Public Document Room 2120 L Street, N.W.,
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Washington, D.C. 20555 and at the Vespasian Warner Public Library,120 West Johnson Street, Clinton, Illinois 61727.
Dated at Rockville, Maryland this19th day of March 1990.
FOR THE NUCLEAR REGULATORY COMMISSION f
/JohnW.Craig, Director 6
Project Directorate III-2 Division of Reactor Projects - III, IV, Y and Special Projects l
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