ML20057D068
| ML20057D068 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/24/1993 |
| From: | ENTERGY OPERATIONS, INC. |
| To: | |
| Shared Package | |
| ML20046D604 | List: |
| References | |
| NUDOCS 9310010056 | |
| Download: ML20057D068 (6) | |
Text
________________
PROPOSED TECHNICAL SPECIFICATIONS CHANGES 9310010056 930924 b
PDR ADOCK 05000368 19 P
INSTRUMENTATION i
INCORE DETECTORS l
l LIMITING CONDITION FOR OPERATION i
j 3.3.3.2 The incore detection system shall be OPERABLE with:
l a.
At least 75% of all incore detectors with at least one incore l
l i
detector in each quadrant at each level, and d
b.
At least 75% of all incore detector locations *, and j
4 4
t 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
be calibrated prior to installation in the reactor core.
l i
- 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
1.0% increase in overall uncertainty on the CECOR F measurement) are
~
y applied to the COLSS and CPCs.
ARKANSAS - UNIT 2 3/4 3-28 Amendment No. 63, 434 l
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MARKUP OF CURRENT ANO-2 TECHNICAL SPECIFICATIONS I
(FOR INFO ONLY)
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INSTRUMENTATION l
t INCORE DETECTORS i
LIMITING CONDITION FOR OPERATION t
3.3.3.2 The incore detection system shall be OPERABLE with:
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:
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4 l
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 nder_oflueLCyrle_l0._the=Jacpr.e=_detectiondyJ1em_may_b_e_
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==ponsi dere dRERAB LE wi t h315La n d._250Lof_ a llint ore _d e t eg tor _s_an d x
_ 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
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_..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 A-93-026 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 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.
i also contains a Software Media Transfer Form to be signed and returned to M.
A. Book at ABB Windsor. 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.
hA'E f
DIWs /
D. R. Earles Project Manager, Nuclear fuel ABB Combustion Engineering Nuclear Power c~en on-enc.
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F. T. Philpott Page 2 A-93-026
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