ML18005A446
| ML18005A446 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 06/01/1988 |
| From: | Eury L CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML18005A447 | List: |
| References | |
| NLS-88-101, NUDOCS 8806080108 | |
| Download: ML18005A446 (11) | |
Text
'CCELERATED DIMBUTION DEMONSTReITON SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:8806080108 DOC.DATE: 88/06/01 NOTARIZED: NO DOCKET FACIL:50-400 Shearon Harris Nuclear Power Plant, Unit 1, Carolina 05000400 AUTH.NAME AUTHOR AFFILIATION
'ORGAN,R.R.
Carolina Power 6 Light Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
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SUBJECT:
Application for amend to License NPF-63 changing Tech Specs 3.3.3.2.a,4.2.2.2.b,4.2.2.3,3.2.3.b
& 3.3.3.2.b.
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CNiiLL Carolina Power 8 LightCompany P. O. Box 1551
~ Raleigh, N. C. 27602 JUN LYNNW. EURY Senior Vice President Operations Support SERIAL: NLS-88-101 10CFR50.90 United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT DOCKET NO. 50-400/LICENSE NO.
NPF-6'3 REQUEST FOR LICENSE AMENDMENT MOVABLE INCORE DETECTORS Gentlemen:
In accordance with the Code of Federal Regulations, Title 10, Parts 50.90 and. 2.101, Carolina Power
& Light Company (CP&L) hereby requests a revision to the Technical Specifications for the Shearon Harris Nuclear Power Plant (SHNPP).
The proposed specification will be in effect for the remainder of SHNPP Cycle 1.
The proposed revision reduces the number of operable incore detector thimbles required by Technical Specification 3.3.3.2.a from 38 to 25.
Use of less than 38 thimbles will be compensated for by increasing the uncertainties associated with the measured FQ(Z), F-Delta-H, and F
values in Technical Specifications 4.2.2.2.b, 4.2.2.3, and 3.2.3.b.
As further compensation, the number of operable thimbles per quadrant required by Technical Specification 3.3.3.2.b will be increased from two to three when less than 38 thimbles are operable.
Westinghouse has performed an Incore Thimble Reduction Study, dated March 28, 1988, which supports the proposed license amendment.
This study is included in Enclosure 4.
Enclosure 1 provides a detailed description of the proposed changes and the basis for the changes.
Enclosure 2 details the basis for the Company's determination that the proposed changes do not involve a significant hazards consideration.
Enclosure 3 provides the proposed Technical Specification pages.
Enclosure 4 provides the Westinghouse Incore Thimble Reduction Study Report.
This report contains information proprietary to Westinghouse Electric Corporation.
Enclosure 5 contains an affidavit supporting this conclusion signed by Westinghouse, the owner of the information.
The affidavit sets forth the basis on which the information may be S806080108 880601 PDR ADOCK 05000400 P
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Document Control Des NLS-88-101 / Page 2
>>withheld from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of Section 2.790 of the Commission's regulations.
Accordingly, it is requested that the information which is proprietary to Westinghouse be withheld from public disclosure in accordance with 10CFR2.790.
Correspondence with respect to the proprietary aspects of the Application for Withholding or the supporting Westinghouse Affidavit should reference CAW-88-035 and should be addressed to R. A. Wiesemann, Manager of Regulatory
& Legislative Affairs, Westinghouse Electric Corporation, P.O.
Box 355, Pittsburgh, Pennsylvania 15230-0355.
In accordance with the requirements of 10CFR170.12, a check for $150 is also enclosed.
Please refer any questions regarding this submittal to Mr. Mark A.
Turkal at (919). 362-2985.
Yours very truly, L.
W. Eury LWE/MAT
Enclosures:
1.
Basis for Change Request 2.
10CFR50.92 Evaluation 3.
Technical Specification Pages 4.
Incore Thimble Reduction Study 5.
Proprietary Information Notice L.
W. Eury, having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power Light Company.
My commission expires: // g P cc:
Mr. Dayne H. Brown w/a Mr. B.
C. Buckley w/a Dr. J. Nelson Grace w/a Mr. G.
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ENCLOSURE 1 SHEARON HARRIS NUCLEAR POWER PLANT NRC DOCKET NO. 50-400 OPERATING LICENSE NPF-63 REQUEST FOR LICENSE AMENDMENT MOVABLE INCORE DETECTORS BAS S
OR CHANGE R U
S o osed Chan e
The proposed revision reduces the number of operable incore detector thimbles required by Technical Specification 3.3.3.2.a from 38 to 25 for the remainder 'of SHNPP Cycle, l.
Use of less than 38 thimbles will be compensated for by increasing the uncertainties associated with the measured FQ(Z), F-Delta-H, and F valuep in Technical Specifications 4.2.2.2.b, 4.2.2.3, and 3.2.3.b.
As further compensation, the number of operable thimbles per quadrant required in Technical Specification 3.3.3.2.b will be increased from two to three when less than 38 thimbles are operable.
Basis The purpose of the Movable Incore Detection System is to allow periodic mapping of core power distribution in order to ensure that Technical Specification peaking factor limits are met and to detect anomalous conditions in the core.
The requirements for incore monitoring are discussed in Section 4.3.2 of the Standard Review Plan-and General Design Criteria 13.
Technical Specification 3.3.3.2 requires that at least 38 detector thimbles be operable.
The proposed change reduces the required number of operable detector thimbles to 25 for the remainder of SHNPP Cycle 1.
Reducing the required number of operable thimbles to 25 will not significantly affect the ability of the Movable Incore Detection System to measure core power distributions.
However, to compensate for a reduced number of thimbles, the uncertainty in determining the Fx component of the power distribution map (Surveillance Requirement 4.2.2.2.b) and the measured FQ(Z)
(Surveillance Requirement 4.2.2.3) will be increased above the normal 5S allowance by the relationship 5% + (38 - T)/6.5%, where T is the number of operable detector thimbles.
This relationship increases the uncertainty allowance to 7S when 25 thimbles are used.
In addition, the restriction on maximum F-Delta-H established in Technical Specification 3.2.3 will be increased by the relationship (38
- T)/13%, where T is the number of operable detector thimbles.
This relationship increases the standard 4S measured uncertainty already included in the 1.49 limit to 5% when 25 thimbles are used.
These additional uncertainties conservatively account for the potential increase in measurement uncertainty and are explicitly discussed in Enclosure 4.
As further compensation, the number of operable thimbles per quadrant required by PAGE 1/2
Technical Specification 3.3.3.2.b will be increased from two to three when less than 38 thimbles are operable.
The SHNPP core is designed with margin in total core peaking factor and margin in F-Delta-H to the Technical Specification limits for the allowed operating conditions (i.e., maintaining Axial Flux Difference within Technical Specification limits).
The Company concludes that these margins, along with the proposed increase in measurement uncertainty and the increased number of operable thimbles per quadrant, are sufficient to assure that the core thermal limits will not be exceeded.
The SHNPP core is currently operating in the last quarter of cycle 1 with more than ample thermal margins.
This is typical of initial core operations with standard Westinghouse fuel loadings.
Comparison with flux maps and predictions indicate that the additional peaking factor penalties can be easily accommodated for the remainder of cycle 1.
The Movable Incore Detector System is used to detect anomalous conditions in the core.
One of these is the inadvertent loading of fuel assemblies into an improper position.
This is not a concern for the remainder. of SHNPP Cycle 1 since there will be no opportunity to move fuel in the core.
Other anomalous conditions will produce either an axial or radial power distribution effect, which would cause either a change in quadrant tilt ratio or axial offset ratio.
These parameters are monitored by the excore detectors; aiding in the identification of such problems.
Furthermore, the core exit thermocouples, located at the outlet of approximately one third of the fuel assemblies, supplement the incore detectors in detection of abnormalities.
Westinghouse has performed an incore thimble reduction study which concludes that the proposed license amendment is acceptable on a permanent basis.
This study is included in Enclosure 4.
PAGE 2/2
ENCLOSURE 2 SHEARON HARRIS NUCLEAR POWER PLANT NRC DOCKET NO. 50-400 OPERATING LICENSE NPF-63 REQUEST FOR LICENSE AMENDMENT MOVABLE INCORE DETECTORS OC 50 9
EVALU T ON The Commission has provided standards in 10CFR50.92(c) for determining whether a significant hazards consideration exists.
A proposed amendment to an operating license for a facility involves no significant hazards consideration if operation of the facility in accordance with the proposed amendment would not: (1) involve a significant increase in the probability or consequences of an accident previously evaluated, (2) create the possibility of a new or different kind of accident from any accident previously evaluated, or (3) involve a significant reduction in a margin of safety.
Carolina Power & Light Company has reviewed this proposed license amendment request and determined that its adoption would not involve a significant hazards consideration.
The bases for this determination are as follows:
Pro osed Chan e
The proposed revision reduces the number of operable incore detector thimbles required by Technical Specification 3.3.3.2.a from 38 to 25 for the remainder of SHNPP Cycle l.
Use of less than 38 thimbles will be compensated for by increasing the uncertainties associated with the measured FQ(Z), F-Delta-H, and F values in Technical Specifications 4.2.2.2.b, 4.2.2.3, and 3.2.3.b.
As further compensation, the number of operable thimbles per quadrant required in Technical Specification 3.3.3.2.b will be increased from two to three when less than 38 thimbles are operable.
Basis The change does not involve a significant hazards consideration for the following reasons:
The proposed amendment does not involve a significant increase in the probability or consequences of an accident previously evaluated.
The probability of previously evaluated accidents is unchanged because the proposed amendment does not affect any system or equipment which is involved in the initiation or mitigation of any previously analyzed accident.
The change does not introduce any new equipment or require any existing equipment or systems to perform a different type of function than they are currently designed to perform.
PAGE 1/3
Measures will be taken to ensure that no thermal limit will be exceeded as a result of reducing the number of operable thimbles.
With less than 38 operable
- thimbles, the uncertainty in determining the F component of the power distribution map (Surveillance Requirement 4.2.2.2.b) and the measured F~(Z)
(Surveillance Requirement 4.2.2.3) will be increased above the normal 5% allowance by the relationship 5% + (38 - T)/6.5%, where T is the number of operable detector thimbles.
This relationship increases the uncertainty allowance to 7% when 25 thimbles are used.
In addition, the restriction on maximum F-Delta-H established in Technical Specification 3.2.3 will be increased by the relationship (38 - T)/13$, where T is the number of operable detector thimbles.
This relationship. increases the standard 4S measured uncertainty already included in the 1.49 limit to 5% when 25 thimbles are used.
These additional uncertainties have been conservatively calculated in Enclosure 4 and provide assurance that the actual core thermal limits remain within the current licensing basis.
As a further compensation, the number of operable thimbles per quadrant required by Technical Specification 3.3.3.2.b will be increased from two to three when less than 38 thimbles are operable.
This represents an additional restriction not currently in the Technical Specifications.
In addition, there are adequate supplemental indicators (excore detectors and core exit thermocouples) of anomalous conditions to preclude an unsafe condition from escaping detection with the reduced incore detector mapping capability.
This will ensure that the consequences of previously evaluated accidents are not increased, The proposed amendment does not create the possibility of a new or different kind of accident from any accident previously evaluated because the change does not affect the method in which the incore movable detector
- system, or any other safety system, performs its safety function.
The change does not introduce any new equipment or require any existing equipment or systems to perform a different type of function than they are currently designed to perform.
The proposed amendment does not involve a significant reduction in the margin of safety.
The core operations will still be in accordance with the current CAOC operating requirements and rod insertion limits.
In addition, current margins to peaking factor limits are large and consistent with typical first cycle operations.
As a result, no change in core margins or operations would be expected with this change for cycle 1.
Thimble reduction to 25 operable thimbles will not significantly affect the ability of the Movable Incore Detection System to measure core power distributions.
Adequate measures will be taken to ensure that no thermal limit violations will result from the reduced number of operable thimbles.
With less than 38 operable
- thimbles, the uncertainty in determining the F
component of the power distribution map (Surveillance Requirement 4.2.2.2.b) and the PAGE 2/3
measured F<(Z) (Surveillance Requirement 4.2.2.3) will be increased above the normal 5% allowance by the relationship 5% +
(38 - T)/6.5S, where T is the number of operable detector thimbles.
This relationship increases the uncertainty allowance to 7% when 25 thimbles are used.
In addition, the restriction on maximum F-Delta-H established in Technical Specification 3.2.3 will be increased by the relationship (38 - T)/13$, where T is the number of operable detector thimbles.
This relationship increases the standard 4% measured uncertainty already included in the 1.49 limit to 5S when 25 thimbles are used.
Since these additional uncertainties have been conservatively calculated and more than compensate for the reduction in the number'f thimbles, the current margin of safety is not reduced.
As a further compensation, the number of operable thimbles per quadrant required by Technical Specification 3.3.3.2.b will be increased from two to three when less than 38 thimbles are operable.
This represents an additional restriction not currently in the Technical Specifications.
In addition, there are adequate supplemental indicators (excore detectors and core exit thermocouples) of anomalous conditions to preclude an unsafe condition from escaping detection with the reduced incore detector mapping capability.
PAGE 3/3