ML20066C554
| ML20066C554 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 01/07/1991 |
| From: | Richter M COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19310D132 | List: |
| References | |
| IEB-90-002, IEB-90-2, NUDOCS 9101100274 | |
| Download: ML20066C554 (14) | |
Text
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Commonwealth Edison -
A3_ p 1400 opus Place LjI r
U '
Downers Grovo, Illinois 60515 l.
January 7, 1991 3
Dr. Thomas E. Hurley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Hashington, D.C.
20555 r
Attn:
Document Control Desk i
Subject:
LaSalle County Nuclear Power-Station Unit 1 Fuel Channel Evaluation for LaSalle Unit 1 Cycle 5 HRC Docket _No. 50-373 R
1
References:
(a) M. Richter (CECO) letter'to U.S NRC, dated April 26, 1990.-
(b) Conference Cal 1 on November 26, 1990 between CECO (M. Richter et al.-) and NRR (B. Siegel, L. Phillips, A'. Atta_rd),
Dr. Murley:
NRC Bulletin-90-02 (Bulletin)-requested that all Bolling Water Reactor (BWR) licensees address the effect.of fuel channel bowLon thermal margins-in BHRs,-particularly the bow of channels that are being-reused for a second bundle lifetime. ' Reference (a) provided Commonwealth Edison Company's (CECO) response to the Bulletin for-LaSalle-County-Station (LaSalle). 'The response. indicated that although CECO no longer places Irradiated channels on new/ fresh fuel assemblies,' previous channel management practices-included the reuse of channels.
Consequently -LaSalle Unit 1 Cycle 5 (presently _ scheduled to begin on April 28, 1991) will utilize some fuel channels which.had been previously Installed on other fuel bundles (for a single operating cycle).
In a recent teleconference with the NRR Reactor Systems Branch (Referencec(b)),
CECO committed to provide additional information regarding the actions that were being taken to account for the impact of those residual reused channels during Cycle 5. to this letter presents the evaluation-pepformed by CECO to address the thermal margin impact of the residual reused channels during Cycle 5.
This evaluation-was supported by the conservative, cycle-specific channel bow analy_ sis-In Enclosure 2 which was performed'by General Electric.
Company, Although.the channel' bow analysis is conservative, Ceco'has taken 1I additional measures (discussed in Enclosure 1) to provide assurance that the residual reused channels will have no impact on safety margins.
CECO believes these measures are responsive to concerns expressed by your-staff in the Reference (b) teleconference. =0ne of the measures being taken is the replacement of the four reused channels in_the cell with the highest projected Q
L cell average bow.
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Dr. T.E. Hurley
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January 7, 1991 4
It should be noted that the information in Enclosurei2'is considered i'
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to be= proprietary information to General Electric Company,, and 1s supported by -
an affidavit signed by General Electric. Company, the owner of the information, o contains-the affidavit-that sets forth the basis on which the information may be withheld from public disclosure by the NRC and' addresses the considerations listed in paragraph-(b) (4) of 10 CFR 2.790 of the NRC's regulations. Accordingly, Ceco requests that-the.information contained in-be withheld from public disclosure in accordance Sith-10 CFR 2.790.
Please direct any: questions or-comments on this letter to this' office.
1 R_espectfully, NA h.
i M.H. Richter.
j Nuciese Licensing Administrator-j i
Enclosures:
1 - Evaluation of Residual Reused Channels.
on Thermal Hargins for LaSalle 1 Cycle 5 1
2 - General Electric' Evaluation of the Critical Power Impact of Reused Channels for LaSalle 1 Cycle 5 3.--General Electric Company Affidavit-i cc:
A.B. Davis - Regional Administrator, Region lIII J.B. Hickman - Project Manager, NRR L.E. Phillips - Reactor-Systems Branch, NRR A.C. Attard --Reactor Systems Branch, NRR T. Tongue - Senior Resident Inspector, LaSalle MR:lmw-ZNLD652/16 Li
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ENCLOSURE 1 EVALUATION OF RESIDUAL REUSED CHANNELS ON THERMAL MARGINS!
FOR LASALLE 1 CYCLE 5 4
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s ENCLOSURE 1-Evaluation of Residual Reused Channels on Thermal Margins-for LaSalle 1 Cycle 5 BACKGROUND Reference 1, which presented Commonwealth Edison's (Edison) response to NRC Bulletin 90-02 for its Boiling Hater Reactor stations, indicated that although Edison no longer places Irradiated fuel channels on'new/ fresh fuel assemblies, previous channel management practices included the reuse of_'
channels. As a result, the channels from the LaSalle County Station initial cycle discharge batch were placed on the fresh fuel assemblies that were loaded in LaSalle 1 Cycle 3 (as discussed in Reference 1)..
These channels had received a single cycle of irradiation, yielding channel exposures from 4 to 12 GHD/STU, prior-to their placement on the LaSalle 1-Cycle 3 reload fuel.
Although these residual reused channels will accumulate their fourth cycle of irradiation during. Cycle 5.-LaSalle County Station is a C-lattice-plant, with uniform water gaps around the-assemblies; therefore, there is less channel bow as a function of exposure and a smaller impact on local peaking (and hence-critical power margins) as a result of channel bow relative to comparable-0-lattice plants.
The projected LaSalle l' Cycle 5 core configuration is shown in Figure 1.
This figure shows the location-of the reused channels.the end of Cycle 5 projected channel exposure, and the end of Cycle:5 projected fuel assembly exposure.
The fuel assemblies with the reused channels will be on their third cycle of irradiation and hence are scattered throughout the core. ~The-Cycle 5 exposure projections shown in Figure 1 are based on the nominal projected LaSalle 1 Cycle 4 exposure.
LaSalle 1 has been operating at'a higher capacity factor than was assumed in-the calculation of the nominal Cycle 4 exposure; therefore, the end of Cycle 5 exposure may be slightly greater.than that assumed in the Cycle 5 channel bow analysis.
This small exposure-increment (approximately 0.5 GHD/STU) will have a negligible. impact.on the results.
CHANNEL BON AIELYSISEIHQQ Due to the. presence of the residual reused channels, Edison is not incorporating General Electric's (GE) generic channel bow methodology.
(Reference 2)'for determining R-factor adjustments for.LaSalle 1; Cycle 5.
GE's generic methodology utilizes an average channel bow for.all-assemblies in-the core and determines an appropriate R-factor adjustment based cn that average bow.
Rather than use the core average approach, Edison' requested GE to more specifically evaluate the additional impact of the incremental
-exposure which the residual reused channels received during their initial cycle of irradiation on thermal margins for LaSalle 1 Cycle 5.
The results of this analysis, which determined the average channel bow in various four-bundle cells for LaSalle 1 Cycle 5, are presented in Enclosure 2.
-This approach is more representative than the GE-generic methodology as it accurately reflects the operating history of each channel in the four-bundle cell throughout its residence in the core and calculates the resulting bow in each cel1J Page 1 of 5 E NLt45U 17
k The following are key aspects of the GE analysis for LaSalle 1 Cycle 5 f
(Enclosure 2).
- 1) The average channel bow in an individual cell can be used to
-f determine the impact on local peaking to the fuel pins in the j
assemblies in that cell, r
- 2) The GE channel bow predictor model has been adequately vsildated for channel exposures expected in LaSalle 1 Cycle 5.
j 3)
It is conservatively assumed that the-Ilmiting Minimum Critical Power Ratio (MCPR) for the cycle occurs at the same time as maximum channel-exposure.
These key aspects are discussed in greater detall in the following paragraphs.
{
CELLREB&GE_ DON Channel bow perturbs the water gap sizes between assemblies, thereby affecting the local peaking of the peripheral pins.
A larger water gap will increase thermalization, thereby increasing' local pin peaking; a-smaller water gap will have the opposite effect.
Therefore, if the water gap size outside the channel is correctly modeled, the local peaking of the pin will be correctly predicted.
The. bow of the individual channels 4
in the cell is not as critical as the cumulative bow of all the channels in the cell, as the water gap spacing is determined by the displacement of two or more channels.
Therefore, the average bow of a cell can be used to determine the impact on local peaking of the peripheral pint in an assembly since the change in the water gap sizes is adequately modeled.
A0H_EREDICIOR_MODEL The GE evaluation-is dependent on the accuracy of the channel bow predictor model used to calct4 te the bow of each channel.
This model has been previously presented to the NkC by GE and is summarized in Attachment A of Enclosure 2.
The predictor model has been validated try GE using channel exposures up to 57 GHD/MTU,-and has been shown to adequately predict the mean of the bow throughout this exposure range for both C-lattice and D-lattice plants.
Since:the maximum projected channel exposure for LaSalle 1 Cycle 5-is approximately 48 GHD/MTV, the database used by GE in the derivation of the model envelopes the expected maximum exposure, and is therefore applicable to the LaSalle 1 Cycle 5 core configuration.
EXP050RE_ASSUMPl10N An inherent and conservative assumption in the analysis is-that the limiting MCPR in the core occurs at the same cycle exposure as the maximum channel exposure.
The minimum margin to the MCPR Operating Limit occurs at mid-cycle, while the maximum channel exposure occurs at end'of-cycle.
Applying the impact of the maximum channel exposure to all cycle exposures is therefore conservative.
Page 2 of 5 ZNt,0652/19
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For this cycle-specific analysis, GE examined the LaSalle 1 Cycle 5-l octant symmetric core confirguration and selected 29 four-bundle cells, based on individual reused channel exposures, for evaluation us_ing their channel bow predictor model.
The selection ptycess ensured that _those cells which contained reused channels and which could potentially beccee limiting during Cycle 5 were evaluated, either directly or by evaluation of a representative octant symmetric cell (see Figure 1).
Cells near the core periphery were not included due to the_large degree of margin in these low power regions.
These cells have at least 30% margin to the MCPR Operating Limit at the most limiting point in the cycle.
To determine the cells to be evaluated using the channel bow predictor model,-GE examined the range of exposures for the reused channels in each octant symmetric cell containing one or more reused channels. -If the-exposures of the reused channels in the octant symmetric cells were comparable, such that channel bow values would be similar, only one representative cell was chosen for evaluation.
Where-the exposures of the reused channels in the octant symmetric cells were not comparable, each unique cell was evaluated, ensuring that the effects of reused channels with high and low exposures were taken into account, This method of' choosing the cells to be evaluated will bound the bow due to differential._ irradiation growth since the fluence and fluence gradient effects existing in--the reused channels will be taken into account.
Since fluence accumulates in proportion to exposure, the fluence effect is bounded by the consideration of the reused channels with higher exposure; whereas, the fluence gradient effect is bounded by the consideration of the reused channels with lower exposure, since the lower exposure is indicative of an operating history in a low power, peripheral core location where the fluence gradient is large.
CHAMMELEXf0SURLHISLORLAND_CH&HNEL B0H AEL1 SIS _RESULTS for the 29 four-bundle cell locations, the exposure history of the channels in each cell was evaluated to determine the end of Cycle 5 cell-average bow usIng GE's channel bow predictor model.
Sixteen (16) of the cells were non-control-cell locations, while thirteen (13) of the cells-were control cell locations. The average bow for each of the 29 four-bundle cells is shown in Table 1 of Enclosure 2.
The non-control-cell locations have an average bow of 26 mils away from the control blade, and the control cell locations have an average bow of 52 mils away from the control blade.
NQM-EQHIROL-CELLLOC6IIDMS The projected channel bow for the evaluated non-control-cell locations are shown in Table 1 of Enclosure 2.
The GE evaluation recommended the use of a 35 mil bow for the calculation of R-factors for the non-control-cell locations.
Two (2) of the evaluated cells, (25,7) and (11,25), have a projected end of Cycle 5 cell average. bow which sll.ghtly exceeds the recommended bow value for R-factor adjustment.
The non-control-cell at location (25,7) has a cell average bow of 38 mils; however, this cell is near the core periphery, and thus will not become limiting throughout.the cycle due to its relative low-radial power, The most limiting assembly in this cell has a minimum margin of 35% to the MCPR Operating Limit and a minimum margin of 23% to the Linear Heat Generation Rate (LHGR) Limit projected for Cycle 5.
The non-control-Page 3 of 5 ENLD652/2^
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l cell at location (11,25) is projected to have an end of Cycle 5 cell average bow of 36 mils; however, this location is also near the core periphery, and has a minimum margin of 25% to the MCPR Operating Limit, and a minimum margin of 17% to the LHGR Limit.
The remaining, potentially limiting non-control-cell locations have end of Cycle 5 predicted channel bows ranging from 13 to 32 mils.
Therefore, the use of a 35 mil bow for the calculation of the R-factors for the non-control-cell locations will adequately account for channel bow during Cycle 5.
i C0KIR0LCELLLOCATIONS As shown-on Table 1 of Enclosure 2, the control cell locations result in a slightly higher degree of channel bow by the end of Cycle 5 than the
~,
non-control-cell locations, This result is expected since the channels in a control cell location will be exposed to an increased flux gradient:
due to the insertion of the control blade during normal cycle operation. Although the control cell locations have a slightly higher average channel bow, these cells also demonstrate greater margin to;the MCPR limit than do non-control-cell locations, since four relatively high exposure (and hence low power) bundles are loaded in'these cells (as part of the Control Cell Core fuel management strategy to allow mono-sequence operation).
The minimum margin to the MCPR Operating Limit for all control cell locations (including those located in the central, high powered region of the core) during Cycle 5 is 16%, and the minimum margin to the LHGR Limit is 20%.
The GE evaluation, Enclosure 2, recommended the use of a 55 mil. bow for the calculation of R-factors for the= control cell. locations to account.
for channel bow during Cycle 5; however, Edison proposes to use a value which bounds the-projected bow values to add further con _servatism.
For Cycle 5, the control cells will be modeled assuming an end of~ cycle bow of 65 mils.
This approach will bound the projected channel bows for all control cells except for control cell location (15,15), which has a projected average channel bow of 81 mils. To-address control cell location (15,15), the fuel bundles which will reside in that control cell during Cycle 5 will receive new channels during-the Spring 1991 refueling outage (prior to Cycle 5 operation).
d MCER_SaEEILLIMILEY&LUAIl0H Another potential impact of: channel bow is an increase in-the MCPR Safety Limit due to increased measurement uncertainties.. GE has evaluated the spread in the calculated bow data shown in Table 1 of Enclosure 2 and has stated that this spread is within the tolerances used in the generic 4
methodology, Reference 2.
The Reference 2 data was used to determine the potential impact of the increased measurement uncertainties which result from e
channel bow on the MCPR Safety Limit.
Since the standard deviation calculated.
for LaSalle 1 Cycle 5 is within the Reference 2 database, no adjustment to the MCPR Safety Limit is required to ensure fuel cladding integrity.
Page 4 of 5 EtiLD652/20
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u C0ftCLUS10tl o
To summa _rize, the single previous-cycle of exposure on the channels used for the LaSalle-1 Cycle 3 reload batch will bel adequately accounted for by an adjustment of the R-factors for the assemblies'in Cycle-5.
The R-factor adjustment _will be calculated assuming a-65 mil bow for the control cell assemblies and a 35 mil bow for the non-control-cell assemblies. -Hith the replarer nt of the four fuel channels in control cell location (15,15), the 65 mil bow R-factor adjustment will bound the projected'end of Cycle 5 channel bow for the control cells.. A.35 mil bow R-factor adjustment will bound the projected end of Cycle 5' channel bow for all non-control-cell locations except for two octant symmetric,_ low power locations, which have been shown to have substantial-margin.to limits throughout the cycle.-
-Based on the conservative, cycle specific channel bow analysis (Enclosure 2), coupled with the additional measures taken by Edison as previously discussed, the remaining residual; reused channels 'n LaSalle 1 4
Cycle 5 do not present a challenge to either the MCPR Safety id t or the design LHGR Limit.
As ' indicated in the Reference 1 response to NC Bulletin-90-02, Edison has discontinued the previous practice of-channiint fresh fuel with previously-trradiated channels and is committed to assuring that any residual reused channels will have no impact on safety.
References:
1.
Letter, M.H. Richter to U.S. Nuclear Regulatory Commission, "Dresden Station Units 2 and 3, Quad Cities-Station Units 1 and 2 LaSalle County Station Units 1 and 2 - Response to NRC Bulletin 90-02, NRC_ Docket.Nos.
50-237/249, 50-254/265, 50-373/374", April _26, 1990.
2.
Letter, P.H. Marriott (GE) to T.E. Hurley (NRC), " Fuel Channel Bow",-
. August 22,.1989.
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Page 5 of 5 T.HLD450/22
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FIGURE 1 4
LaSalle1 Cycle 5EndofCycleExposureLProjections j
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The attached figure shows the. location of reused channels;in LaSalle 1 Cycle 1
5.
Control cell. locations are identified,for reference 1 purposes, o
The information included for each reused:channe'l.is'as-follows:
LYJ553f-_ Assembly Identification
- 42. - Channel. Projected End of Cycle Exposure,-GHD/MTV
- 29. - Fuel Assembly Projected End of Cycle Exposure, GHD/MTU The calculated-average channel _ bow for each cell islindicated in the center of the four bundle _ cell, if analyzed. _The bowsisLexpressed in mils, and a negative bow indicates _that the chantals are bowed away from the control blade.
If the' designation S(x,y) appears in the center' of the cell, the bow of the cell is bounded by location (x,y) and was_not explicitly modeled.
l Page 1 of.5 EED652/23 i
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30 NOT NOT NOT NOT NOT NOT NOT REUPID REUSED REUSED REUSED REUSED REUSED REUSED Page 4 of 5
l j
l Ficure 1, continued I
16 17 18 19 20 21 22 23 24 2$
26 27 26
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29 29 d07 NOT NOT NOT NOT NOT HQT NOT REUSED REUSED REUSED REUSED LEUEED REUSED REUSED REUSED 30 NOT NOT NOT NOT NOT NOT NOT REUSED REUSED REUSED REUSED REUSED REUSED REUSED Page 5 of 5 l
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1-i i
i ENCLOSURE 2 e
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F 1
GENERAL ELECTRIC EVALUATION OF THE 4
i CRITICAL POWER IMPACT OF REUSED CHANNELS.
FOR LASALLE 1 CYCLE 5 e
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