ML20057D068

Proposed Tech Spec 3.3.3.2,revising LCO Re Incore Detection Sys

ML20057D068
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/24/1993
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20046D604	List: 2CAN099304, Application for Amend to License NPF-6,revising LCO for Unit 2 Incore Detection Sys Re TS 3.3.3.2 ML20057D068 ML20057D071 ML20057D074
References
NUDOCS 9310010056
Download: ML20057D068 (6)

Text

________________

PROPOSED TECHNICAL SPECIFICATIONS CHANGES 9310010056 930924 b PDR ADOCK 05000368 19 P PDR $

INSTRUMENTATION ,

i INCORE DETECTORS l l' LIMITING CONDITION FOR OPERATION l i

j 3.3.3.2 The incore detection system shall be OPERABLE with:

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• i a. At least 75% of all incore detectors with at least one incore l l d

detector in each quadrant at each level, and  :

4

b. At least 75% of all incore detector locations *, and j 4

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c. Sufficient operable incore detectors to perform at least six tilt l

^

estimates with at least one tilt estimate at each of three j levels. l t

An OPERABLE incore detector location shall consist of a fuel assembly (

i containing either a fixed detector string with a minimum of three OPERABLE [

l rhodium detectors or an OPERABLE movable incore detector capable of mapping _;

the location. l

! I A tilt estimate can be made from two sets of symmetric pairs of incore

detectors. Two sets of symmetric pairs of incore detectors are formed by .

l '

two pairs of diagonally opposite symmetric incore detectors, one incore detector per quadrant.  ;

AE'ELICABILUY : When the incore detection system is used for monitoring the AZIMUTHAL POWER TILT, radial peaking f actors, local power density or DNB ,

margin.

l ACTION:  !

With the incore detection system inoperable, do not use the system for the j above applicable monitoring or calibration functions. The provisions of j Specifications 3.0.3 are not applicable.

SURVEILLANCE REQUIREMENTS l 4.3.3.2 The incore detection system shall be demonstrated OPERABLE: j

a. By performance of a CHANNEL CHECK within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to its ,

use and at least once per 7 days thereafter when required for  !

monitoring the AZIMUTHAL POWER TILT, radial peaking f actors, local power density or DNB margin. l

b. At least once per 18 months by performance of a CHANNEL CALIBRATION operation which exempts the neutron detectors but-includes all electronic components. The neutron detectors shall i l be calibrated prior to installation in the reactor core.  !

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• For the remainder of Fuel Cycle 10 the incore detection system may be ,

cor.sidered OPERABLE with <75% and 250% of all incore detectors and detector locations provided the appropriate penalties (based on a full l

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1.0% increase in overall uncertainty on the CECOR F y measurement) are applied to the COLSS and CPCs.

ARKANSAS - UNIT 2 3/4 3-28 Amendment No. 63, 434 l i

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MARKUP OF CURRENT ANO-2 TECHNICAL SPECIFICATIONS ,

I (FOR INFO ONLY)  !

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. l INSTRUMENTATION

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INCORE DETECTORS i LIMITING CONDITION FOR OPERATION 3.3.3.2 The incore detection system shall be OPERABLE with: t

a. At least 75% of oil incore detectors 1 with at least one incore l detector in each quadrant at each level, and {

b. At least 75% of all incore detector locations 1, and l-

c. Sufficient operable incore detectors to perform at least six tilt  !

estimates with at least one tilt estimate at each of three  !

levele  ;

An OPERABLE incore detector location shall consist of a fuel assembly containing either a fixed detector string with a minimum of three OPERABLE rhodium detectors or an OPERABLE movable incore detector capable of mapping ,

the location. I A tilt estimate can be made f rom two sets of symmetric pairs of incore j detectors. Two sets of symmetric pairs of incore detectors are formed by  ;

two pairs of diagonally opposite symmetric incore detectors. one incore detector per quadrant.

i AEELICAB111)): When the incore detection system is used for monitoring the  !

AZlMUTHAL POWER TILT, radial peaking f actors, local power density or DNB  ;

margin.  ;

f ACllfli: l 4

[

With the incore detection system inoperable, do not use the system for the above applicable monitoring or calibration f unctions. The provisions of Specifications 3.0.3 are not applicable. l SURVEILLANCE REQUIREMENTS 4.3.3.2 The incore detection system shall be demonstrated OPERABLE:

a. By performance of a CHANNEL CHECK within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to its ,

use and at least once per 7 days thereafter when required for i monitoring the AZ'MUTHAL POWER TILT, radial peaking f actors, local power density or DNB margin.

b. At least once per 18 months by performance of a CHANNEL CALIBRATION operation which exempts the neutron detectors but includes all electronic components. The neutron detectors shall  ;

be calibrated prior to installation in the reactor core llor the=nem_aj m nder_oflueLCyrle_l0._the=Jacpr.e=_detectiondyJ1em_may_b_e_

==ponsi dere dRERAB LEx wi t h315La n d._250Lof_ a llint ore _d e t eg tor _s_an d

_ d e t e ct.o r.._l ora ti on s .prnylde d =1h e_ app r opria t e= pen alt i es J b a s ei on_ a_ full

= lALJ E cLe ale =i a-91eLallJ D C ert ai nly=a n=4 h e=C EC OLfg.measurementLa rr

_..a ppJlig d_t o_t h e_CO LS S_an d_Q C L ARKANSAS - UNIT 2 3/4 3-28 Amendment No. 53, 434 l

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' SEA E AOWN ECsERI l

Entergy Operations, Inc.

Arkansas Nuclear One - Unit 2 i September 21, 1993 '

l A-93-026 1

Mr. F. T. Philpott

• Entergy Operations, Inc.

Arkansas Nuclear One P. O. Box 608 ,

Russellville AR 72801

Subject:

ANO-2 Cycle 10 COLSS and CPCS Addressable Constants for a Reduced i Number of Operable incore Detectors

Dear Mr. Philpott:

This letter provides revised COLSS and CPCS addressable constants and COLSS  :

database constant K09 for ANO-2 Cycle 10 based on an analysis assuming a l reduction in the Technical Specification 3.3.3.2 minimum percent operable incore detector locations from 75% to a value as low as 50%. The information i provided in this letter has been verified in accordance with ABB-Combustion Engineering Nuclear Fuel Quality Assurance procedures. i The revised COLSS and CPCS constants are provided in Enclosure 1. Enclosure 1 i also contains a Software Media Transfer Form to be signed and returned to M.  ;

A. Book at ABB Windsor. Enclosure 2 contains supporting information, j including an administrative procedure change, for the proposed Technical ,

Specification change and a marked up copy of the proposed new Technical i Specification. '

The information provided in this letter supercedes that provided, based on i engineering judgement, in Reference 1. As expected, the information provided in Reference I has been shown to have excess conservatism.

If you have any questions on the contents of this lettcr, please contact me or Mr. Sasan Etemadi at (203) 285-3647.

Sincerely, COMBUSTION ENGINEERING, INC.

f hA'E DIWs D. R. Earles

/

Project Manager, Nuclear fuel '

l ABB Combustion Engineering Nuclear Power c~en on-enc. g gs g n= ggmeg,g81911 Windso' Connectcat C6095-0500 Te'er 99297 COf/ BEN WSOR

1 F. T. Philpott Page 2 A-93-026 l

Enclosures:

1. COLSS and CPCS Addressable Constants for Reduction of Operable Incore Detectors

2. Proposed Changes to Incore Detector Technical '

Specification

Reference:

1. D. R. Earles to F. T. Philpott, " Reduction of the Number of Operable Incore Detectors for ANO-2 Cycle 10," A-93-027, September 16, 1993.

xc: .

M. A. Book 5318-GC28 (CE)

J. A. Brown 5318-GC28 (CE)

S. P. Emery 9341-0425 (CE)

S. Etemadi 5318-GC28 (CE)

C. B. Franklin Entergy/ECH (w/o encl.)

S. F. Grill 5318-GC28 (CE)

J. G. llead Entergy/AN0 K. L. Heitman 5318-GC28 (CE)

R. B. Lang Entergy/ECH K. H. Marquis 5318-GC28 (CE)

M. R. McKinney Entergy/ANO

0. C. Mims Entergy/AN0 W. E. Russell 5318-GC28 (CE)

P. Rensen 5318-GC28 (CE)

R. C. Sykes ABB-CE/AN0 E. L. Trapp 5304-GC27 (CE) (w/o encl .)

C. H. Turk Entergy/AND R. M. Wilkins Entergy/ECH (w/o encl.) '

R. S. Wirges Entergy/ANO J. D. Young 5304-GC27 (CE)

K. T. Zelnick Entergy/AND ANO-DCC Entergy/ANO i

i I