ML20076G073
| ML20076G073 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/18/1983 |
| From: | Clark R Office of Nuclear Reactor Regulation |
| To: | Kreutzer P Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20076G076 | List: |
| References | |
| NUDOCS 8308290368 | |
| Download: ML20076G073 (3) | |
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Md40RANDUMFOR:
Patricia M. Kreutzer. Licensing Assistant Operating Reactors Branch #3 Division of Licensing FROH:
Robert A. Clark Chief Operating Reactors Branch #3 Division of Licensing
SUBJECT:
REQUEST FOR PUBLICATION IN MONTHLY FR NOTICE - NOTICE OF CONSIDERATION OF ISSUANCE OF AMENOMENT TO FACILITY OPERATING LICENSE AND PROPOSED NO SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION AND OPPORTUNITY FOR A HEARING Arkansas Power and Light Company, Docket No. 50-368. Arkansas Nuclear One, Unit No. 2, Pope County, Arkansas Date of amendment request: July 12, 1983 Description of amendment request: The amendment would revise the Technical Specifications (TS)pertainingtotheincoredetectionsystem. The amend-ment would modify the definition of the term "0PERABLE" as it applies to an incore detector location. A mininuan of three working rhodium detectors out of five in a location will cw.stitute an OPERABLE incore detector location as opposed to a minimum of four working detectors as defined in the present l
TS. The amendment would also add a new requirement for the incore detection system operability by specifying that the system shall be operable with at l
least 75% of all incore detectors with at least one incore detector in each quadrant at each level.
Finally, the amendment would modify the incore detec-tion system operability requirement which specifies that the system shall be operable with a minimum of two quadrant incore detector locations per core quadrant. The proposed change would specify that the system shall be operable with sufficient operable incore detectors to perform at least six tilt esti-mates with at least one tilt estimate at each of three levels.
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> Basis for proposed no significant hazards consideration deteminationi: The pro-posed change pertaining to redefining of an operable incore detector location represents a relaxation in limiting conditions for operation. However, even with two failed detectors in each incore detector location, the system can provide acceptable data to be used for monitoring the Azimuthal Power Tilt, radial peaking factors, local power density or departure from nucleate boiling (DN8) margin. Therefore, the results of this change, while reducing safety margins, are clearly within the acceptable criteria. Thus, this proposed change is similar to an example of "no significant hazards" in the guidance provided by l
the Commission (48 FR 14870), namely, a change which "may reduce in some way a safety margin but where the results of the change are clearly within all acceptable I
criteria with respect to the system as specified in the Standard Review Plan.
The proposed change pertaining to the requirement of two quadrant symmetric incore detector locations per core quadrant constitutes an additional limitation in that the change would explicitly require six tilt estimates and further require at least one tilt estimate be available at each of three levels to en-l sure a representative core coverage. A tilt estimate can be made from two sets of symmetric pairs of incore detectors, which areffonned by two pairs of diagonally I
opposite symmetric incore detectors, one incore detector per quadrant. Therefore.
I the present TS requirement of two quadrant symmetric incore detector locations per core quadrant would be encompassed by the proposed change.
The proposed chance to constrain the total number of detector failures per-I mitted and ensure all parts of the core are instrumented constitutes an additional limitation. Therefore, the two abovementioned changes match an example of "no l
significant hazards" in the guidance provided by the Commission (48 FR 14870),
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g Oriinst signed by: Based on the foregoing, the staff proposes to determine that none of the requested changes involve significant hazards considerations.
Local Public Docur. ant Room location: Tomlinson Library Arkansas Tech University.
Russellville. Arkansas 72801 l
Attorney for licensee: Nicholas S. Reynolds. Esq., Debevoise & Liberman 1200 Seventeenth Street N.W., Washington, D. C.
20036 NRC Branch Chief: Robert A. Clark Orignal signed byf Robert A. Clark Chief Operating Reactors Branch #3 Division of Licensing cc:
R. S. Lee Docket File ORB #3 Rdg Memo File PDR RStee PMKreutzer RAC1 ark
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