ML20245C710
| ML20245C710 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 06/15/1989 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8906260261 | |
| Download: ML20245C710 (1) | |
Text
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.jp DUKE POWER GOMPANY
- P.O. Box 33180 CHARLOTTE, N.C. 28242 IIAL !!. TUCKER -
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(704) 373-4531 l
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r WHEILEAR PRODt10FION June'15, 1989 U. S.' Nuclear Regulatory Commission Washington, D. C..20555 j
Attention: Docu r.! Control Desk-
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Subject:
Catawba NuclePr Station
]
Docket Nos. 's0-413 and 50-414-
.J Allowable Mismatches of Power Range
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Instrumentation and Thermal' Power j
1
.The purpose of this letter is to outline the position Catawba will take with regard to mismatches of indicated reactor power that may occur between the
' Power Range Instrumentation and Thermal Power indic.ations. This was discussed-with Catawba's resident inspectors and T. Dunning of the Office of Nuclear Reactor Regulation. This position, had it been applied-at the' time, would Lhave resulted.in no violation of Technical Specification 2.2.1 on April 29, 1987 (Violation 413, 414/87-30-01). - Also, Licensee Event Report 414/88-30,.
dated January 9, 1989.may have been unnecessary.
In.our conversations with NRC personnel, it was decided that the equation-in Technical. Specification 2.2.1 does not apply for power mismatches. The correct Technical Specification LCO is 3.3.1, specifically. Action.2 in Table
-3.3-1.
Also,Lthe allowed ~ mismatch during transient situations can be a 5%
difference before tho' Power Range < Instrument channel must be considered inoperable. This is based on an evaluation by the Duke Design Engineering Department. This evaluation determined that a 5% difference is' justified during transient situations through the use of existing. margins in the various transient and setpoint analyses.
. Any questions concerning this may be directed to Peter LeRoy (704) 373-8466.
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Very truly yours.
,M pet-Hal B. Tucker
.PGL/IV/43-xc: S. D. Ebneter, Regional Administrator W. T. Orders U. S. Nuclear Regulatory Commission NRC Resident Inspector Region II Catawba Nuclear Station 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 fPd-e i
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