ML022000389
| ML022000389 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 07/10/2002 |
| From: | Beaver B Duke Power Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML022000389 (11) | |
Text
DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW
- 2) 02188 NPA MANAGER EC05N
- 3) 02467 ELECT. LICENSING LIBRARY ECO50
- 4) 02532 MCG NRC INSP MG-ADMIN MAIL RM
- 5) 02546 WC LIBRARY - MG01WC
- 6) 03044 MCG DOC CNTRL MISC MAN MGO5DM
- 8) 03379 D E CALDWELL MG01MM
- 9) 03447 HARRY J SLOAN MG01 RP
- 11) 03744 OPS TRNG MGR. MG03OT
- 12) 03759 U S NUCLEAR REG WASH, DC
- 13) 04771 E E HITE EC09E
- 14) 04809 MCG PLANT ENG. LIBR. MG05SE
- 15) 05160 PTVU MG01RC DOCUMENT NO SELECTED LICENSEE COMMITMENT MANUAL MEMORANDUM LOEP SLC 16.9.24 QA COND Duke Power Company DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION SELECTED LICENSEE COMMITMENTS MANUAL (SLC)
Page 2 of 3 REV #/ DATE DISTR CODE 2
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07/10/02 Document Transmittal #:
DUK021910003 QA CONDITION
[: Yes 0
No OTHER ACKNOWLEDGEMENT REQUIRED N Yes IF QA OR OTHER ACKNOWLEDGEMENT REQUIRED, PLEASE ACKNOWLEDGE RECEIPT BY RETURNING THIS FORM TO:
Duke Power Company P.O. Box 12700 Document Management MGO1 S2 Hagers Ferry Road Huntersville, N.C.
28078 Rec'd By Date 6
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NA NA NA NA 025 025 025 028 07/08/02 07/08/02 07/08/02 06/27/02 MADM-03A vi VI V1 V1 vi V1 V1 Vi vi V2 V8 Vi V2 V1 TOTAL 56 REMARKS:
PLEASE UPDATE YOUR MANUAL ACCORDINGLY H B BARRON, JR.
VICE PRESIDENT MCGUIRE NUCLEAR STATION BY:
B C BEAVER MG01RC BCB/CMK PRIORITY Normal 1
July 8, 2002 MEMORANDUM To: All McGuire Nuclear Station Selected Licensee Commitments (SLC) Manual Holders
Subject:
McGuire SLC Manual Update Please revise your copy of the manual as follows:
REMOVE INSERT List of Effective Sections Rev 24 List of Effective Sections Rev 25 Entire SLC 16.9.24 Entire SLC 16.9.24 Rev 28 Revisions may skip numbers due to Regulatory Compliance Filing System.
Please call me if you have questions.
Bonnie Beaver Regulatory Compliance
SLC LIST OF EFFECTIVE SECTIONS SECTION REVISION NUMBER DATE 16.1 REVISION 0 12/14/99 16.2 REVISION 0 12/14/99 16.3 REVISION 0 12/14/99 16.4 Not Issued 16.5.1 REVISION 0 12/14/99 16.5.2 REVISION 0 12/14/99 16.5.3 REVISION 0 12/14/99 16.5.4 REVISION 7 09/14/00 16.5.5 REVISION 0 12/14/99 16.5.6 REVISION 0 12/14/99 16.5.7 REVISION 0 12/14/99 16.5.8 REVISION 0 12/14/99 16.5.9 REVISION 0 12/14/99 16.5.10 REVISION 0 12/14/99 16.6.1 REVISION 0 12/14/99 16.6.2 REVISION 0 12/14/99 16.6.3 REVISION 17 04/08/02 16.6.4 REVISION 27 06/12/02 16.7.1 REVISION 0 12/14/99 16.7.2 REVISION 24 4/29/02 16.7.3 REVISION 0 12/14/99 16.7.4 REVISION 1 4/11/00 16.7.5 REVISION 0 12/14/99 16.7.6 REVISION 0 12/14/99 16.7.7 REVISION 0 12/14/99 16.7.8 REVISION 26 6/3/02 16.7.9 REVISION 0 12/14/99 16.7.10 REVISION 0 12/14/99 16.8.1 REVISION 2 4/11/00 16.8.2 REVISION 0 12/14/99 16.8.3 REVISION 26 6/3/02 16.9.1 REVISION 18 12/4/01 16.9.2 REVISION 5 5/24/00 16.9.3 REVISION 0 12/14/99 16.9.4 REVISION 1 03/02/00 16.9.5 REVISION 0 12/14/99 16.9.6 REVISION 0 12/14/99 16.9.7 REVISION 25 5/14/02 16.9.8 REVISION 0 12/14/99 16.9.9 REVISION 13 2/26/01 16.9.10 REVISION 13 2/26/01 16.9.11 REVISION 22 2/25/02 16.9.12 REVISION 13 2/26/01 16.9.13 REVISION 13 2/26/01 16.9.14 REVISION 22 2/25/02 16.9.15 REVISION 25 5/14/02 16.9.16 REVISION 19 12/03/01 McGuire Units 1 and 2 I
Revision 25
SLC LIST OF EFFECTIVE SECTIONS SECTION REVISION NUMBER DATE 16.9.17 REVISION 0 12/14/99 16.9.18 REVISION 0 12/14/99 16.9.19 REVISION 0 12/14/99 16.9.20 REVISION 8 11/30/00 16.9.21 REVISION 0 12/14/99 16.9.22 REVISION 0 12/14/99 16.9.23 Not Issued 16.9.24 REVISION 28 6/27/02 16.10.1 REVISION 0 12/14/99 16.11.1 REVISION 9 2/1/01 16.11.2 REVISION 23 4/4/02 16.11.3 REVISION 0 12/14/99 16.11.4 REVISION 0 12/14/99 16.11.5 REVISION 0 12/14/99 16.11.6 REVISION 0 12/14/99 16.11.7 REVISION 12 3/14/01 16.11.8 REVISION 0 12/14/99 16.11.9 REVISION 0 12/14/99 16.11.10 REVISION 0 12/14/99 16.11.11 REVISION 0 12/14/99 16.11.12 REVISION 0 12/14/99 16.11.13 REVISION 0 12/14/99 16.11.14 REVISION 21 1/17/02 16.11.15 REVISION 21 1/17/02 16.11.16 REVISION 1 4/11/00 16.11.17 REVISION 1 4/11/00 16.11.18 REVISION 0 12/14/99 16.11.19 REVISION 0 12/14/99 16.11.20 REVISION 0 12/14/99 16.12.1 REVISION 0 12/14/99 16.12.2 REVISION 0 12/14/99 16.13.1 REVISION 0 12/14/99 16.13.2 REVISION 24 4/29/02 16.13.3 REVISION 24 4/29/02 16.14.1 REVISION 0 12/14/99 McGuire Units 1 and 2 Revision 25
Spent Fuel Pool Storage Rack Poison Material 16.9.24 16.9 AUXILIARY SYSTEMS 16.9.24 Spent Fuel Pool Storage Rack Poison Material COMMITMENT
- a.
The Region 1 panel average storage rack poison material Boron 10 areal density shall be greater than or equal to:
0.005 gm B10/cm 2 for Region 1A 0 gm Bdcm2 for Region 1 B
- b.
The Region 2 panel average storage rack poison material Boron 10 areal density shall be greater than or equal to:
0.003 gm Bo/cm 2 for Region 2A 0 gm Bjo/cm 2 for Region 2B APPLICABILITY When a fuel assembly is stored in a spent fuel rack cell location.
REMEDIAL ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.
Panel average storage A.1 Perform ITS SR 3.7.14.1 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> rack poison material Boron 10 areal density AND not within limits.
Every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> thereafter until the affected fuel assembly is moved.
AND A.2.1 Verify that the fuel 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> assembly in the affected location meets the requirements of ITS LCO 3.7.15(b) for Region 1.
OR (continued)
McGuire Units 1 and 2 16.9.24-1 Revision 28
Spent Fuel Pool Storage Rack Poison Material 16.9.24 REMEDIAL ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME A.
(continued).
A.2.2 Verify that the fuel 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> assembly in the affected location meets the requirements of ITS LCO 3.7.15(d) for Region 2.
OR A.2.3 Initiate actions to move the Immediately affected fuel assembly to an acceptable location.
TESTING REQUIREMENTS TEST FREQUENCY TR 16.9.24.1 Verify that the panel average spent fuel pool storage 3 years rack poison material is within limits.
BASES The McGuire spent fuel storage racks contain Boraflex neutron-absorbing panels that surround each storage cell on all four sides (except for peripheral sides). The function of these Boraflex panels is to ensure that reactivity of the stored fuel assemblies is maintained within required limits. Boraflex, as manufactured, is a silicon rubber material that retains a powder of boron carbide (B4C) neutron absorbing material.
The Boraflex panels are enclosed in a formed stainless steel wrapper sheet that is spot-welded to the storage tube.
The wrapper sheet is bent at each end to complete the enclosure of the Boraflex panel. The Boraflex panel is contained in the plenum area between the storage tube and the wrapper plate. Since the wrapper plate enclosure is not sealed, spent fuel pool water is free to circulate through the plenum.
It has been observed that after Boraflex receives a high gamma dose from the stored irradiated fuel (>1010 rads) it can begin to degrade and dissolve in the wet environment. The potential degradation mechanisms with respect to boraflex in spent fuel storage racks include:
(1) gamma radiation-induced shrinkage of boraflex and the potential for developing tears or gaps in the material, and (2) gradual long-term boraflex degradation over the intended service life of the racks as a result of gamma irradiation and exposure to the spent fuel pool environment.
Revision 28 McGuire Units 1 and 2 16.9.24-2
Spent Fuel Pool Storage Rack Poison Material 16.9.24 BASES (continued)
Thus, the B4C poison material can be removed, thereby reducing the poison worth of the Boraflex sheets. This phenomenon is documented in NRC Generic Letter 96-04, "Boraflex Degradation in Spent Fuel Pool Storage Racks". To address this degradation, the spent fuel racks have been analyzed taking credit for soluble boron as allowed in WCAP-14416-NP-A, "Westinghouse Spent Fuel Rack Criticality Analysis Methodology," Revision 1, November 1996. This methodology ensures that the spent fuel rack multiplication factor, keff is less than or equal to 0.95. Codes, methods and techniques used in the McGuire criticality analysis are used to satisfy this kef criterion. The spent fuel storage racks are analyzed to allow storage of fuel assemblies with enrichments up to a maximum of 4.75 weight percent Uranium-235 while maintaining keff <__0.95 including uncertainties, tolerances, bias, and credit for soluble boron.
Soluble boron credit is used to offset uncertainties, tolerances, and off-normal conditions and to provide subcritical margin such that the spent fuel pool ke, is maintained less than or equal to 0.95. The soluble boron concentration required to maintain keff less than or equal to 0.95 under normal conditions is 730 ppm. In addition, sub-criticality of the pool (keff < 1.0) is assured on a 95/95 basis without the presence of the soluble boron in the pool. Credit is taken for reactivity depletion due to fuel burnup and reduced credit for the Boraflex neutron absorber panels.
The limits specified for the panel average storage rack poison material Boron 10 areal density ensures the keff of the spent fuel pool will always remain < 1.00, assuming the pool to be flooded with unborated water. The specified limit of Boron 10 areal density in boraflex preserves the assumptions used in the analyses of the potential criticality accident scenarios. These limits are the minimum required concentration for fuel assembly storage.
The criticality analysis performed shows that the acceptance criteria for criticality is met for the storage of fuel assemblies with soluble boron credit, reduced credit for the Boraflex panels and the storage configurations and enrichment limits Specified by ITS LCO 3.7.15.
The storage configuration requirements specified by ITS LCO 3.7.15 establish four regions within the spent fuel pool storage racks. Figure 16.9.24-1 illustrates the four regions for the Unit 1 spent fuel pool and Figure 16.9.24-2 illustrates the four regions for the Unit 2 pool.
The limits specified are not applicable if a storage cell location does not contain a fuel assembly.
The REQUIRED ACTIONS associated with this Selected Licensee Commitment (SLC) are designed to ensure that an unplanned criticality event cannot occur as a result of degraded boraflex conditions.
REQUIRED ACTION A.1 verifies the Spent Fuel Pool boron concentration to be within Technical Specification 3.7.14 limits. These limits are based on the cycle-specific Core Operating Limits Requirements (COLR) document. The COLR Spent Fuel Pool boron concentration cannot be less than 2675 ppm soluble boron for any specific cycle (note that the initial boron concentration used in the Spent Fuel Pool boron dilution analysis is 2475 ppm soluble boron). If ITS SR 3.7.14.1 indicates boron concentrations less than the acceptable level, the associated REQUIRED ACTIONS are to immediately suspend movement of fuel assemblies in the pool area and to immediately initiate boron additions to raise the boron concentration to acceptable levels. REQUIRED ACTIONS A.2.1 and A.2.2 associated with this SLC determine if the assembly can be qualified for storage in Region 1 B or Region 2B.
If the assembly cannot be stored in one of these regions, REQUIRED ACTION A.2.3 requires that actions be initiated immediately to move the affected fuel assembly to an acceptable location.
There may be circumstances that will prevent the movement of the affected assembly in a reasonable time period. For example, if the pool is nearly full, there may not be enough spaces available to meet the required storage McGuire Units 1 and 2 16.9.24-3 Revision 28
Spent Fuel Pool Storage Rack Poison Material 16.9.24 BASES (continued) configurations of ITS LCO 3.7.15.
In this case, it is acceptable to continue REQUIRED ACTION A.1 until the affected fuel assembly can be moved to an acceptable location. The daily verification of boron concentration per ITS SR 3.7.14.1 ensures the assumptions used in the associated criticality analyses are maintained. There is a large amount of margin between the COLR boron concentration and the boron concentration needed to maintain subcritical conditions in the Spent Fuel Pool.
Daily verifications are considered to be adequate to ensure that no dilution evolution could go undetected for an extended period resulting in boron concentrations less than the minimum amounts necessary for maintaining subcritical conditions.
The testing requirements will verify that the Boron 10 areal density is within acceptable limits.
The preferred method for verifying the Boron 10 areal density would be in-situ testing at least every three years. Testing may be performed more frequently based on engineering judgment, spent fuel pool water chemistry, and modeling projections of boraflex degradation.
McGuire Units 1 and 2 Revision 28 16.9.24-4
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BASES (Continued)
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FIGURE 16.9.24 - 1 Spent Fuel Pool Storage Rack Poison UNIT I SPENT FUEL POOL SUB-REGION MAP
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Spent Fuel Pool Storage Rack Poison Material 16.9.24 BASES (continued)
REFERENCES
- 1.
UFSAR, Section 9.1.2.
- 2.
Issuance of Amendments, McGuire Nuclear Station, Units 1 and 2 (TAC NOS.
M89744 and M89745), November 6,1995.
- 3.
Double contingency principle of ANSI N16.1-1975, as specified in the April 14, 1978 NRC letter (Section 1.2) and implied in the proposed revision to Regulatory Guide 1.13 (Section 1.4, Appendix A).
- 4.
UFSAR, Section 15.7.4.
- 5.
10 CFR 50.36, Technical Specifications, (c)(2)(ii).
- 6.
NRC Generic Letter 96-04: Boraflex Degradation in Spent Fuel Pool Storage Racks, June 26, 1996.
- 7.
WCAP-14416-NP-A, Westinghouse Spent Fuel Rack Criticality Analysis Methodology, Revision 1, November 1996.
- 8.
Issuance of Amendments, McGuire Nuclear Station, Units 1 and 2 (TAC NOS.
MA9730 and MA9731), November 27, 2000.
- 9.
MCEI-0400-128, "McGuire Nuclear Station Spent Fuel Pool Storage Rack Region Designations for Individual Cells", Rev. 002, June 12, 2002.
Revision 28 McGuire Units 1 and 2 16.9.24-7