ML20116M469
| ML20116M469 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 11/12/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20116M461 | List: |
| References | |
| NUDOCS 9211200288 | |
| Download: ML20116M469 (2) | |
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UNITED STATES q
NUCLEAR REGULATORY COMMISSION
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WASmNOTON, D, C. 20656
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED T0 AMENDMENT NO.188 TO FACIllTY OPERATING LICENSE--.NO. DPR-49 IOWA ELECTRIC LIGHT AND POWER COMPANY CENTRAL IOWA POWER COOPERATIV,E CORN Bell POWER COOPERATIVt DUANE ARNOLD ENERGY CENTER DOCKET NO. 50-331
1.0 INTRODUCTION
By letter dated April 22, 1992 and supplemented by another letter dated April 23, 1992, t1e licensee requested-an amendment to its-operating license to incorporate reactor water cleanu) (RWCU) system leak detection instrumentation requirements into tie Technical Specifications.
An. internal; review had indicated that additional leak detection instrumentation was necessary for a 50-foot section of the 4-inch RWCU return line which is routed through the first floor of the reactor building, During the last refueling outage, the licensee installed the instrumentation, and administrative controls are currently in effect which require it to be maintained in an operable status consistent with the content of this amendment request.
2.0 EVALUATION The Duane Arnnld Energy Center (DAEC) currently has steam leak detection for the RWCU equipment rooms that includes high ambient temperature, high differential-temperature and high differential-flow detection.
This instrumentation is reflected in Technical Specifications Table 3.2-A,
" Instrumentation That Initiates Primary Containment Isolation."
The licensee has installed four dual element thermocouples to detect _ leaks along the entire run of the RWCU return piping which operate identically to those of the existing ambient temperature monitoring equipment for the RWCU system. The associated temperature switches provide: redundant signals to Division I and Division II of the Primary Containment Isolation System (PCIS) logic and initiate automatic closure of the RWCU system isolation valves.
Operational safety has been enhanced by the installation of the thermocouples and adding them to the TS will ensure their availability to provide leak detection and isolation capabilities for;the RWCU system.-
The trip setting for the new instrumentation.provides maximum sensitivity to a
-postulated leak in RWCU piping while avoiding spuricus isolations of the system and the "s" notation ensures conservative adjustment of the setpoint.
Surveillance requirements for the new instrumentation are already addressed by the requirements of-Table 4.2-A, Item 9, for reactor cleanup area high temperature.
-.9211200288 921112 PDR -ADOCK 05000331 P
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The supplemental information in the letter dated April 23, 1992 was editorial in nature and did not contain substantive changes to the original submittal.
The staff has reviewed the licensee's submittal which requests changes to its technical specifications to incorporate the reactor water cleanup (RWCU) system leak detection instrumentation requirements.
Based on its review, the staff concludes that the requested change is acceptable.
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 State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
S 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 significant hazards consideration and there has been no public comment on such finding (57 FR 24673).
Accordingly, this amendment meets the eligibility criteria for i
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 connection wit) the issuanca.of this amendment.-
5.0 CONCLUSION
The staff has concluded, based'on the considerations discussed above, that:-
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operatica 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:
L. Y. Shiraki Date:. November 12, 1992 F e-+
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