ML17286A609
| ML17286A609 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 02/25/1991 |
| From: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-90-002, IEB-90-2, TAC-76354, NUDOCS 9103040382 | |
| Download: ML17286A609 (23) | |
Text
ACCELERATED EQTRIBUTION DEMONSATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9103040382 DOC.DATE: 91/02/25 NOTARIZED: NO DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH.NAME AUTHOR AFFILIATION SORENSEN,G.C.
Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
R
SUBJECT:
Suppls 900413
& 0928 responses to NRC Bulletin 90-002, "Loss I
of Thermal Margin Caused by Channel Box Bow," per NRC 901224 request.
D DISTRIBUTION CODE:
IE38D COPIES'RECEIVED:LTR + ENCL SIZE: /~
S y
/
NOTES:
RECIPIENT ID CODE/NAME PD5 LA INTERNAL: AEOD/DOA NRR FIENO,D NRR/DET/EMEB 7E NRR/DOEA/OGCB11 NRR/DST/ 8E2 PM RES/DSIR/EIB EXTERNAL: NRC PDR COPIES LTTR ENCL 1
0 1
1 1
1 1
1 1
1 1
1 1
1 1
1 RECIPIENT ID CODE/NAME PD5 PD AEOD/DSP/TPAB NRR LONG,W PD31 NRR/DOEA/OEAB11 NRR/DREP/PEPB9D N
S B12 G
02 RGN5 FILE 01 NSIC COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1'
D D
D NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 18 ENCL 17
WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968
~ 3000 George Washington Way
~ Richland, Washington 99352 February 25, 1991 G02-91-037 Docket No. 50-397 U.S. Nuclear Regulatory Commission Attn:
Document Control Desk
.Washington, D.C.
20555 Gentlemen:
Subject:
NUCLEAR PLANT NO. 2, OPERATING LICENSE NPF-21 REQUEST FOR ADDITIONAL INFORMATION REGARDING NRC BULLETIN 90-02, "LOSS OF THERMAL MARGIN CAUSED BY CHANNEL BOX BOW" {TAC NO. 76354)
Reference:
1.
G02-90-075, April 13,
- 1990, GC Sor'ensen (Supply System) to
- USNRC, "Nuclear Plant No.
2, Operating License NPF-21, Modification to the WNP-2 Cycle 6
Reload Submittal and
Response
to NRC Bulletin No.
90-02:
Loss of Thermal Margin Caused by Channel Box Bow" 2.
G02-90-. 162, September 28,
- 1990, GC Sorenson (Supply System) to
- USNRC, "Nuclear Plant No.
2, Operating License NPF-21, Final
Response
to NRC Bulletin No.
90-02:
Loss of Thermal Margin Caused by Channel Box Bow" 3.
Letter and Attachments, December 24,
- 1990, P.L.
Eng.(NRC) to G.C.
Sorensen
{Supply System),
same subject Attached is the Supply System response to the request (Reference
- 3) for additional information, on channel box bow in WNP-2.
Very truly yours, G.
C. Sorensen, Manager Regulatory Programs WCW:bw
Attachment:
Response
cc:
JB Martin -
NRC RV NS Reynolds - Winston 8 Strawn PL Eng -
NRC DL Williams - BPA/399 NRC Site Inspector - 901A 9103040382 910220 PDR ADOCK 05000397 9
REQUESTED INFORMATION REGARDING KNP-2 CYCLE 7 OPERATION KITH REUSED CHANNELS 1.
The number of channels scheduled to be reused in Cycle 7.
The number of reused channels scheduled for" Cycle 7 is 349.
Of the 352 reused channels in Cycle 6, three will be discharged at EOC6.
2.
Please provide the following for each channel scheduled for reuse in Cycle 7
~
a.
Planned location coordinates for Cycle 7 for each channel.
The planned location coordinates for Cycle 7 for each reused channel are given in Table 1 attached.
The location of each reused channel is also indicated on the attached Cycle 7 core map {Figure 1) by assembly number.
The appropriate channel number for each assembly number can be determined from Table l.
b.
Mhether any of the channels scheduled to be reused in Cycle 7 will be located adjacent to new fuel assemblies.
One-hundred-sixty-four of the reused channels will
- be located face adjacent to new fuel assemblies.
c.'hether any of the reused channels will be adjacent to a limiting bundle during Cycle 7.
Given the number of reused channels, it is likely that a reused channel will be adjacent to a limiting assembly during Cycle 7.
The precise location of limiting assemblies during Cycle 7 will be dependent upon the actual operating experience of (and control rod patterns used for) Cycle 7
operation.
- However, experience has shown that limiting assemblies are almost always once burned assemblies and, potentially at the end of a long
- cycle, fresh assemblies can become limiting.
There are many instances of reused channels being adjacent to once burned and fresh assemblies in the Cycle 7 core.
As an example, at the beginning of Cycle 7 assembly UD5104 in location 22,22 is the limiting assembly.
This assembly is face adjacent to reused channel 73227 (location 21,22),
reused channel 63947 (location 22,21),
and reused channel 63940 (location 22,23).
At the end of Cycle 7, limiting assembly UD6074 (location 17,19) is face adjacent to channel 71990
{locati on 17, 18),
channel 73405
(=1 ocati on 16,'19),
and channel 70106 (location 18,19).
It is therefore likely that a
reused channel could be adjacent to a limiting assembly at some time during Cycle 7.
This probability is recognized and taken into account in calculation of the Safety Limit Minimum Critical Power Ratio,
- SLMCPR, as discussed in the response to 3.b given below.
Page Two ATTACHMENT d.
Discuss the estimated exposure and maximum calculated channel bow for each channel reused in Cycle 7 (using the Supply System Analytical Model).
Channel distortion (bow
+ bulge) magnitude and direction is directly dependent upon the location history of the channels.
The channel that will have the largest estimated maximum exposure at EOC 7 is channel 71927.
This channel will -reside in core location 2,15 (xy coordinates from the upper left corner as shown in Figure 1) in WNP-2 during Cycle 7.
The operational history of this channel is:
CYCLE NO.
LOCATION (x,
)
23,6 16,10 17,5 Spent Fuel Pool ll,ll 3,10 2,15 CYCLE EXPOSURE (MWD/MTU) 9169 5860 5644 0
8590 8400*
7800*
ACCUMULATED EXPOSURE (MWD/NTU) 9169 15029 20673 20673 29263 37663 45463
- Estimated The Supply System analytical model predicts a
maximum calculated channel bow for this channel to be equal to or less than 58 mils.
The model predicts a maximum calculated channel bulge to be less than or equal to 45 mils for-this channel.
The total predicted distortion is less than or equal to 103 mils.
Exposures for the other reused channels in WNP-2 are shown
,in Table 1.
The calculated total distortion of these channels can generally be expected to be less than this value.
We would like to reaffirm that the Supply System model is used to re-qualify channels.
It is not used to estimate SLNCPR effects.
This process is described in 3.b
- below, and is, based on a
measured channel distortion data base.
The Supply System has measured channels out to exposures of 30,655 MWD/NTU.
Their measured maximum distortion was
- compared, on a selected
- basis, to the Supply System model.
Calculated values were found to be conservative relative to measurements, except at very low exposures.
(
Reference:
EANF-90-0434, November 13,
- 1990, WC Wolkenhauer to DL'hitcomb, "Comparison of Supply System Channel Distortions Model to Experimental Data).
Page Three ATTACHMENT 3.
Discuss how the anticipated maximum channel bow will affect the following parameters during Cycle 7:
a.
MCPR Operating Limit The anticipated effect of maximum channel bow is accounted for in the MCPR operating limit by modification to the SLNCPR which is a part of the NCPR operating limit.
A discussion of the method for inclusion of channel bow affects in the SLNCPR is given below in 3.b.
b.
MCPR Safety Limit The WNP-2 NCPR safety limit, SLMCPR, is established through statistical consideration of measurement and calculational uncertainties associated with the thermal hydraulic state of the reactor using design basis radial, axial and local power distributions and considering fuel channel bow.
Topical Report XN-NF-524(P)(A),
Revision 2
and Supplements, "Advanced Nuclear Fuels Critical Power Methodology for Boiling Water Reactors",
discusses ANF MCPR safety limit methodology and describes in detail how channel bow effects are incorporated into the NCPR safety limit.
The effects of channel bow are included in the WNP-2 Cycle 7 safety limit.
Without channel bow the WNP-2 Cycle 7
NCPR safety limit would be reduced by about 0.03.
CYCLE 7 LOAD PATTERN SHOWING ASSEMBLIES WITH REINSERTEO CHANKELS 2
3
~
4 5
7 8
9 10 11 12 13 14 15 I
2 3
4 5
6 7
8 9 XH)160>>
10 LJT339>>
ll LJT311>>
12 LJT325>>
13 LJT187>>
14 LJT328" 15 LJT282>>
16 LJT240" 17 LJT235>>
18 LJT270*
19 LJT272>>
20 LJT271>>
21 LJT193" ZZ XH2037*
23 24 25 26 27 28 29 30 LJT)88*
AN3104*
U05065*
UD4128 UD5127 UD4032*
U05030*
AM3133*
AH3102*
UD5042 U04006*
UD508D UD4131 UD5095 AN3050*
LJT308*
XH2027*
XH2026*
UD4111 UD4088 AH3053*
AH3031*
XH2024 UD6043 U04122 AH3046 AN3037*
UD4071 UD6069 XH2D71 AH3044*
AN3057*
UO4021*
UD4042*
XH2061*
XN2041*
XN1060 XH)065 U04118 UD5111 UD6017 UD6702 XN2130 UD5087 LYV153 U06025 UD406)
AH3041* UD5055 XN2084* AH3079*
XN2047* UD5121 U06045 UD4044 AH3034>> UD5063*
AN3011* UD5084 UD6057 UD4098 XHZ)18 U05085 XH2066* AN3128*
AN3020* UD5039>>
UD6077 UD4143" UD5134 LYV)56 UD6704 XN2104*
UDS086 U06095 XN2122* UD4116" XN)117 XN2124 XN2121 U04052 XN2018.
U05135 UD6019 XH2004 UD6026 UD4024*
UD6037 U04047 UD6046 XN1100 XN)066 UD6058 UD4005*
UD6071 U04076 UD6078 XN2062*
UD6089 UD5102 XN2012 UD409)
XN2112 XH2049*
LJT277*
XH2132 U04018 WA6003 U06700 U06007 XH2006 UD5070* UD6009 AH3032* AN3051*
AH3099* XN2120 U05123 UD4017 UD4043 UD6027 AN3042* AH3038*
XN1135 XH2085*
U05061 XN2023>>
UD4103 UD6047 XN2086* XN1146 XH2056* XH2123*
UD4040* U06059 UD5008* XH2116 XH2048* XH2055*
AN3127* AH3009 U04101 UD6079 UDS010* UD4077 AN3101* XN2113 AN3123* AH3013*
U05017* U06097 UD6105 XH1153 WA6001 UD6706
'XN2103* U04078 LJT3)Z*
XH2013 AM3092>>
UD4051-U05069*
U05064*
XH2127 UD5131 UD4114 U05058 AH3076*
UD5056 UD4104 UD5054 UD4113 UD5130 UD5040*
U04144*
UD5075 U04012*
UD5036*
AN3073*
UD5009*
U04137*
UD5004*
XHZ089*
UD5076 U05028*
U04092 AN3088*
XH2131 LJT197*
UDS)25 AN3074*
UD6003 UD4112 UD601D UD4100 U06020 AH3075*
UD6028 XH1154 UD6038 XH2007 UD6048 XH2126 XH2102*
UD6060 XN2105*
UD6072 XN2058*
UD6080 AN3D71>>
UD6090 UD4041*
U06098 UD4138*
UD6107 AN3087*
UD5079 LJT)60*
LJT273* LJT393*
UD4045 UD5066*
AN3043* XH2025 AN3035* XN2087" U05062 AN3070*
UD4115* UD6011 AH3100* XN2046" AH3040* XH2106*
U05057 UO4099 XH)150 UD6029 AH3052* AN3039*
AN3069* AH3067>>
U05129 U04117 UD4062 UD6049 XH2003 'N2022*
XH1137 XN2040*
U04016* U06061 UD5078 UD4033>>
AN3010 AH3072*
AH3019* AN3055*
XH200S* U06081 UD5016* UD4039*
AH3118 XH2098*
AN3086* XN2119 UD4011* UD6099 UD5014* AH3131*
AH3056* XN2065*
AH3012* XN2073*
U04038* UD5082 LJT340* LJT384*
LJT342*
UD4054 UD6001 XN2115 UD5124 UD4048 UD5072*
XH2045 U05093 XHZ)14 U05071*
UD4108 UD5126 AN3066*
UD4121 UD4072 AH3114*
UD5094 UD4026*
U05020*
XH2110*
UD5120 XN2072*
U05011*
UD4015*
U05081 XN2088*
UD6111 UD4097 LJT231*
LJT171*
UD5122 U04034*
UD6004 UD4046 UD6012 UD4053 UD6021 UD4107 UD6030 UD4082 UD6039 AH3054*
UD6050 AN3080*
AN3002*
U06062 AH3058*
UD6073 U04028*
U06082 UD4027*
UD6091 UD4095 UD6100 UD4102 U06108 UD4094 UD5018*
LJT387*
LJT202*
UD4146 AM3064*
AN3068*
U05132 XH1039 XH2091*
XH2129 UD5128 XH2134 XN1074 XHZ)25 UO4025*
AN3036*
AH3033*
AN3132*
AH3014*
UD4087 XH2050*
XH2075" XH2111>>
U05077 XH2028*
XN2081*
XN1124 U05103 AN3113*
AN3018" UD4145 LJT250*
16 17 19 20 21 22 23 24 25 26 27 28 29 30 1 LJT205*
2 U04147 3 AN3028*
4 AN3096*
5 UD5119 6 XN1037 7 XN2D99*
8 XH1106 9 U05068 10 XN)143 ll XN2016 12 XH2020 13 UD4073 14 AH3008*
15 AN3021>>
16 AN3024*
17 AH3015*
18 U04090 19 XH2076*
20 XN2057*
21 XN2093*
22 UD5038*
23 XH2036*
24 XH2078*
25 XN1125 26 UD5090 27 AH3109*
28 AN3117 29 UD4148 30 LJT335*
LJT)84>>
UD5116 UD4059 UD6005 U04057 UD6013 UD4070 UD6022 U04129 UD6031 UD4093 UD6040 AN3082*
UD6051 AH3001*
AN3122" UD6063 AN3112" UD6074 U04049 UD6083 UO4OOS UD6092 UD4068 UD6101 UD4084 UD6109 U04074 UD5002 LJT)65*
LJT331*
U04069 UD6002 XN1110 UD5052 UD4010 U05091 XN2097*
UD5083 XN)161 UD5043 UD4124 U05118 AH3095*
UD4031*
UD4075 AH3106*
UD5033*
UD4037*
UD5098 XN2042*
UD5059 XN2059*
UD5089 UD4013*
UD5032*
XHZ)07*
UD6112 UD4067 LJT226*
LJT)76* LJT286* LJT213*
UDS))5 UD4020 U05108 XN2108* AN3083* AH3090*
XN2095* AN3007* UD6006 AN3027" U05045 UD4109 UD60)4 UD4105 UD6015 XN2009 AN3049* U04001 XH2080* AN3126* UD6023 UD4120 UD5041 AH3107*
UD6032 XN2015 UD6033 AH3125* AH3120* XH2044 AH3098* AN3081* UD6041 UD4123 U05048 XN2117 UD6052 UD4056 UD6053 XN2096* XH2030 XN1138 XN2136 XN1151 XN2038" U06064 UD4139* U06065 UD4023* UD5029* XH2039*
AH3110* AH3023* U06075 AN3077* AH3063* XN2074*
U06084 XN2135 U06085 UD4007* UD5037* AH3115*
XH2090* AH3017* U06093 XN2011 AN3091* UD4036*
UD6102 U04132* U06103 AN3121* UD5100 UD4136" XH2052* AH3078* UD6110 XN2060* AN3059* AN3105*
UD5034* U04083* U05107 LJT)80* LJT253* LJT)67*
XN1159 AN3089* LJT341*
UD4065 UD4058 UD5112 U06701 UD5073 XK2031 XN1144 UD6016 UD5117 AH3119*
UD4127 XN)093 UDS)09 UD4066 AN3097* UD6034 UD5074 AH3130*
U04106 XH2101*
U05110 XHZ)09*
UD4050 UD6054 U05114 XN1155 U05101 XN2054*
UD4142* UO6066 UD5026* XM2008 U04134* XH2051*
U05022* AH3006*
AN3116* UD6086 U05104 UD4086 U04141* XH)103 UD5106 AN3005*
XN2069* UO6104 UDSD97 XN1142 UD5025* UD6707 UD4030* UD4085 AH3094* LJT227*
XN)102 XN1140 WA6004 U06008 UD5D50 AH3030>>
AN3045*
U05051 UD4064 AH3025*
XN2017 U05044 UD4119 XH2094*
XN2068*
U04035*
UD5096 XN1152 AN3062*
U04079 UD5024*
AH3108*
AM3048*
U05099 UD6106 WA6002 XN2043*
XH2034 XN1092 U040Z9* XIN)06)
XN1156 UD4126 UD5046 U06018 UD6024 XN1162 XK20Z) 'LYV155 UD6035 UD4009 UD4022* UD5053 UD6042 AH3084*
U04019 U05047 UD6055 UD4063 XH1101 UD5049 XN1081 U05001 UOBO67 UO4OBO UD4014* UD5023*
UD6076 AN3016*
UD4060 UD5031*
U06087 UD4140*
XH2063* LYV)54 UD6094 XH2092*
UD5088 UD6096 XN1070 U04004*
UD4081 XH1111 XH1157 XH2001*
XN2032 U05133 UD6703 UD5013*
UD6036 AN3026*
XH2067" XH)158 UD6056 AH3022*
AN3061*
UD6068 XH)020 XH2100*
AN3060*
UD6088 UD5136 UD6705 U05092 XH2082*
XH2010 XH2035 UD4110 U04125 AN3103*
AN3029*
XH1090 UD6044 UD4096 AH3124*
AN3129*
UD4089 UD6070 XN1141 AH3047*
AH3)ll>>
UD4003*
UD4135>>
XH2064>>
XN2)33 LJT288*
AH3085* XN2033 UD5067 LJT)62*
UD4130 LJT323*
UD5113 LJT369*
UO4055 LJT241*
UD5035* LJT337*
AH3134* LJT214*
AH3065* LJT179*
UD5060 LJT237*
U04002 LJT216*
UD5105 LJT247*
U04133 LJT295" UD5021* LJT376*
AH3093* XH2083*
LJT218*
ASSEMBLY WITH REINSERTED CHANNEL
TABLE 1 REINSERTED CHANNELS~ ASSEMBLIES'ND PROJECTED EOC 7
EXPOSURE 1
1 1
1 1
1 1
1 1
1 1
1 2
2 2
2 2
3 3
3 3
3 3
3 3
4 5
5 5
5 6
6 6
7 7
7 7'
7 10 11 12 13 14 15 16 17 18 19 20 21 8
9 12 22 23 10 11 14 15 16 19 20 21 9
11 12 15 16 19 20 9
12 19 25 3
7 11 3
7 8
11 12 13 CURRENT ASSEMBLY LJT197 LJT273 LJT393 LJT342 LJT17 1 LJT2 02 LJT2 05 LJT184 LJT33 1 LJT176 LJT286 LJT2 13 LJT277 AN3092 UD5066 AN3089 LJT341 AN3074 AN3043 UD4034 AN3064 AN3028 XN2108 AN3083 AN3090 UD5069 AN3035 XN2087 AN3068 AN3096 XN2095 AN3007 UD5064 AN3070 AN3027 UD4029 XN2027 UD5070 UD4 115 XN2026 AN3032 AN3051 AN3100 XN2046 UD5072 CHANNEL ID 73437 70171 71815 73418 73169 60835 71832 71996 71462 73113 71329 73363 60903 635,72 7 1780 62513 60827 73425 6450D 72009 72035 72474 73379 71809 73390 63492 71986 71965 70287 70257 70104 5960D 71198 5881D 71437 73090 73412 71945 71785 73375 71942 63949 73120 71370 70238 PROJ
~
EOC 7 EXPOSURE 37291 ~
42181 37859
'7410~
37681 ~
42389.
42047
'7674 41790
~
37838
~
41624
'7034
'1318.
42000
'6087 42087
'1996~
43942.
36086
'6550 40944.
40760
'0520
'4760
'4018 37599
'0193
'7611.
41846
'1548~
37735
'1472~
37048
'1839
'0198~
44725
'7572
'7374
'2967 43416
'1281~
44000
'3638
'4071~
37375 '
TABLE 1 (CONT
)
CURRENT ASSEMBLY CHANNEL ID PROJ EOC 7
EXPOSURE 7
7 7
7 7
8 8
8 8
8 8
8 8
8 9
9 9
9 9
9 10 10 10 10 10 10 10 11 11 11 11'l 11 11 11 11 11 11 11 11 11ll 11 11 12 12 12
'5 16 20 23 24 2.
7 11 12 18 19 20 24 29 1
2 10 21 27 29 1
2 3
9 22 28 30 1
3 6
7 8
11 12 13 19 20 23 24 25 27 28 30 1
5 XN2091 XN2099 AN3049 AN3119 AN3030 LJT188 AN3099 AN3040 XN210 6 XN2097 XN2080 AN3126 AN3045 LJT288 XN1160 AN3104 AN3075 AN3107 UD5013 AN3085
'LJT339 UD5065 AN3053 AN3076 AN3097 AN3103 LJT162 LJT311 AN303 1 AN30 4 1
'D4024 AN3042 AN3038 AN3052 AN3039 UD5071 AN3125 AN3120 AN3130 AN3025 UD4022 AN3026 AN3029 LJT323 LJT325 XN2084 AN3079 71387 61638 72024 63442 71443 73225 71956 73367 73168 62446 72003 71933 71914 72019 72475 72039 73079 71808 70110 73394 71889 61550 5898D 5809D 71400 73154 70262 71480 71389
~ 73108 62926 71970 71756 71958 71789 71938 71755 73226 6012D 63257 73386 72001 72439 72000 73443 71936 63445 32832
'9340
'3636
'4045
'1420
'8183~
44006
'2178
'3080
'1169
'3058
'4604
'4501~
41459+
42631 ~
44759
'4723
'1961~
37045
'4054
'7565
'4444'5484
'6217
'4878
'5474
'7290
'8181
'5069
'9430
'3058
'4217~
44389
'3211~
39495.
30622
'9350
'3678
'2858
'4119~
31704
~
39889
'4530
'1422~
37900
'7690
'0382'
TABLE 1 (CONT ~ )
CURRENT ASSEMBLY CHANNEL ID PROJ ~
EOC 7 EXPOSURE 12 12 12 12 12 12 12 12 12 13 13 13 13 13 13 13 13 13 14 14 14 14 14 14 14 14 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 16 16 16 16 8
11 12 19 20 23 26 27 30 1
2 4
8 14 15 17 23 30 1
2 13 15 16 18 29'0 1
-2 5
7 12 14 15 16 17 18 19 24 27 28 29 30 1
2 3
XN2085 AN3069 AN3067 AN3098 AN3081 XN210 1 AN3084 XN2067 LJT369 LJT187 UD4032 XN2047 XN2023 AN3054 UD4025 AN3082 XN2109 LZT241 LZT328 UD5030 AN3066 AN3036 AN3008 AN3095 UD5035 LZT337 LJT282 AN3133 AN3034 UD5063 XN2086 XN2022 AN3080 AN3033 AN3021 AN3001 UD4031 XN2096 XN2094 AN3022 AN3124 AN3134 LJT2 14 LZT240 AN3102 AN3037 AN3011 71762 73116 61769 5900D 73111 73438 71391 73582 71364 73136
~ 72010 73584 73401 63427 70279 71447 73424 71441 70161 71848 73366 63602 71758 5938D 71983 73119 71378 71927 71757 71817 71300 71461 5866D 73130 71458 71790 72038 71472 71761 72027 71376 73384 72028 70105 71753 72037 60890 32634
'0169~
43971.
35207
'1215~
32193
'0621
'8280
'7854
'7900
'5037
'3813 34739
'4417
'6086
'2846
'1991.
38180
~
37360
'7270
'2317 41983
~
41921 ~
35801
'6876
'7291~
37417
~
45463
'1747~
37160
'3124
'3800
'3684
'4189
'4185
'2628
'6872
'3764
'2563
'3751
'0867'4677
'1313~
37418
'6410~
40774
'4585.
TABLE 1 (CONT ~ )
Y 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 17 17 17 17 17 17 17 17 17 17 17 17 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 19 19 7
8 9
10 12 14 15 16 17 21 23 24 27 28 29 30 1
7 9
11 13 15 16 18 20 22 24 30 1
2 6
7 10 12 14 17 18'9 20 21 22 25 26 30 1
5 CURRENT ASSEMBLY XN2056 XN2123 UD5040 XN2102 XN2040 AN3002 AN3132 AN3024 AN3122 XN2038 XN2054 XN2068 AN3061 AN312 9 AN3065 LJT17 9 LJT235 UD4040 UD4144 UD4016 M3114 M3014 AN3015 M3106 UD4139 UD4142 UD4035 LJT237 LJT270 UD4006 UD4005 UD5008 XN2105 UD4033 AN3058 M3112 UD5033 UD4023 UD5029 XN2039 UD5026 UD4014 UD5023 LJT2 16 LJT272 XN2066 AN3128 CHANNEL ID 72023 71465 62522 62711 71302 62283 71981 71445 71928 71371 71767 61682 73399 71442 71976 63945 70244 71786 62335 71904 5805D 71985 72014 5932D 61794 6028D 71957 72011 71920 71954 73089 71377 61650 72007 73388 71990 70158 73614 61773 71194 61750 71853 73069 73404 70080 61972 72021 PROJ EOC 7 EXPOSURE 38801 ~
36181 ~
37057
'2634
'3801
'3766.-
44327
'4481 39683
'6167
'5906
'9391~
44383
'0558.
39162
'2075
'7322~
26545
'4127
'6333
'3100
'2042
'2136~
35929
'4507
'9027' 42133 37294 '
38181
'7007
'6904
'7647
'5058
'5129
'4300 43978
'7376
'3368
'7363
'5509
'7563
'4757
'7161
'7058
'7961~
31487
'0571~
TABLE 1 (CONT+ )
Y 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 20 20 20 20 20 20 20 20 20 20 20 20 20-20 20 20 20 20 20 20 20 20 20 21 21 21 21 21 21 21 21 21 X
7 8
9 12 13 15 16 18 19 20 22 23 26 27 30 3
5
.7 9
10 11 12 13 14 15 16 19 20 21 22 23 24 26 27 28 30 1
3 5
9
- 11 13 15 16 18 CURRENT ASSEMBLY XN2048 XN2055 UD4012 AN3072 UD4026 XN2050 XN2076 UD4037 AN31 10 AN3023 UD4134 XN2051 AN3016 XN2100 MT247 LJT271 AN3044 AN3020 UD5039 AN3127
'D5036 XN2058 AN3019 AN3055 UD5020 UD4028 XN2075 XN2057 AN3077 AN3063 XN2074 UD5022 AN3006 AN3062 UD5031 AN3060 AN3047 LJT295 LJT193 AN3057 UD4143 AN3073 XN2005
, XN2110 XN2111 XN2093 XN2042 CHANNEL ZD 5924D 71134 71950 71788 71467 71934 73405 70106 7 1773 5850D 71903 70280 71448 71959 71931 73585 73422 63956 70011 70102 73238 73076 71852 73171 71791 73110 71886 71909 71812 62937 71949 70252 71912 71890 73415 71268 73133 70236 62609 5802D 72042 72036 71495 73588 63951 72040 61727 PROJo EOC 7 EXPOSURE 31187
~
32886
'6433
'3811~
44365
'3144
'3354.
42801
'3660
'1198~
44412 ~,
39107
'0081
'1566~
37681 37903
'5064
'0297
'7160~
44118
'6967
'2570 44051 ~
39853
'7031~
44990.
43287
'5093
'9435
'3842
'6174
'7107
'4509
'4111~
37268
'0133~
42421 ~
37193
'7320
'5475
'6505
'4878
'6326
'4720
'2650
'5965
'4468'
TABLE 1 (CONT ~ )
Y X
21 22 21 26 21 28 21 29 21 30 22 1
22 2
22 3
22 6
22 7
22 9
22 10 22 11 22 12 22 14 22 16 22 17 22 19 22 20 22 21 22 24 22 25 22 28 22 29 22 30 23 2"
23 3
23 5
23 7
23 9
23 12 23 13
'3 15 23 16 23 18 23 19 23 20 23 22 23 24 23 26 23 28 23 '9 24 3
24 7
24 8
24 9
24 10 CURRENT ASSEMBLY AN3116 UD4140 AN3111 UD5021 Za7T37 6 XN2037 AN3050 UD4021 XN2062 UD5010 UD5009 AN307 1 UD5016 UD4039 UD4027 UD5038 UD4008 UD4007 UD5037 AN3115 UD5024 XN2063 UD4003 AN3093 XN2083 MT308 UD4042 XN2104 AN310 1 UD4137 XN2098 XN2072 XN2028 XN2036 XN2059 XN2090 AN3017 UD414 1 AN3108 XN2092 UD4135 Za7T2 18 XN2061 AN3123 AN3013 UD5004 UD4041 CHANNEL ZD 63947 73083 73135 71799 71362 71170 71449 73232.
71410 72034 71913 73131 71356 71835 70233 71960 73148 62647 71830 73227 61529 71897 63953 73420 71843 71955 71943 71146 61523 70221 73364 73440 73383 61541 71765 62699 73139 63940 71994 71810 71975 71398 71456 71991 71838 71908 71923 PROJ EOC 7 EXPOSURE 44849
'4370' 44031
'6971~
37194
'7435
'3271
'2137
'6317
'7193
'7653
'3018
'7100
'5931
'3941~
37562
~
44235
'2447
'7272 44622
'6968
'6809
'2136~
44750
'7284
'2622
'4834
'3851
'4334
'4973
'9960' 33577
'1860
'2581
'1291~
33788
'4616~
44898
'4200
'7028
'2323
'7199~
36990
'3382
'3973
'7836
'6129~
TABLE 1 (CONT o )
CURRENT ASSEMBLY CHANNEL ZD PROJ
~
EOC EXPOSURE 24 24 24 24 24 24 24 24 24 25 25 25 25 25 25 25 25 25 25 25 25 26 26 26 26 26 26 27 27 27 27 27 27 27 27 27 27 28 28 28 28 28 28 28 28 11 13 15 16 20 21 23 24 28 3
4 5
7 9
11 13 18 20 22 26 27 10 11 12 18 19 21" 9
11 12 13 15 16 18 19 20 22 6
7 10 12 15 19 20 21 22 AN3086 UD5011 XN2081 XN2078 AN3091 UD4036-AN3005 AN3048 XN2064 XN2041 XN2122 UD4116 UD5017 XN2089 UD4011 UD4015 UD4013 UD4132 XN2069 UD4004 XN2082 UD4138 UD5014 AN313 1 UD5032 AN312 1 UD4136 UD5028 AN3056 XN2065 XN2088 AN3113 AN310 9 XN2107 XN2052 AN3078 UD5025 XN2049 XN2103 AN3087 AN3012 XN2073 AN3018 XN2060 AN3059 AN3105 UD4030 70047 71930 71390 61673 73112 73441 73153 70272 73239 73392 71280 71764 63943 73376 71792 5912D 71289 73167 71905 73444 71893 71485 71759 72041 70243'1444 62412 71962 61741 71921 72476 HA5422 73121 73224 61526 71967 71141 71857 71331 61578 5999D 71964 71431 73416 5868D 70206 71308 41188
~
37098
'2833 39034
'3635
'6631~
43908
'1281~
37011 ~
44465
'8537
'4882
'7359 35736
'4391~
27317
~
45234
'2969
'6627
'3932
'7812 45221
~
37587
'0537
'7268
'0793
'5092
'6967
'0347
'1248
'6455
'3584
'4005
'2796
'1227~
40534
'7646
'7407
'7571~
43699
'6057
'0520
'0535
'3571~
33397
'3474.
42105
~
TABLE 1 (CONT )
Y
'X.
28 24 28 25 29 8
29 9
29 11 29 14 29 19 29 20 29 22 29 23 30 10 30 11 30 12 30.
13 30 14 30 15 30 16 30 17 30 18 30 19 30 20 30 21 CURRENT ASSEMBLY
- XN2043, XN2001 LJT3 12 AN3088 UD4038 UD5018 UD5034 UD4083 AN3094 MT227 MT160 MT340 MT384 MT231 MT387 LJT250 LJT335 LTT165 ZaTT22 6 LJT180 LTT253 LJT167 CHANNEL XD 71910 72012 70293 5905D 73403 61538 71771 72017 5852D 73067 62542 71211 71499 70216 73609 71997 70291 71457 70060 71438 63636 71911 PROJ
~
EOC 7
EXPOSURE 36813
~
37379 41433
'3246.
26010
'7028
'7032
'4038
'5967
'1079
'7680
'2466
'7100~
42075
~
37318 41424
'7234.
37027.
" 37234
'7035.
37233
'7677~
Docket No. 50-397 Mr. G.
C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way P.O.
Box 968 Richland, Washington 99352 April 22, 1991
Dear Mr. Sorensen:
SUBJECT:
EVALUATION OF
RESPONSE
TO NRC BULLETIN NO. 90-02, "LOSS OF THERMAL MARGIN CAUSED BY CHANNEL BOX BOW" (TAC NO. 76354)
On March 20, 1990, the NRC issued Bulletin No. 90-02, "Loss of Thermal Margin Caused By Channel Box Bow."
The bulletin contained reporting requirements applicable to boiling water reactor facilities using fuel channel boxes for a second bundle lifetime.
You responded to the bu lletin in letters dated April 13, 1990 (G02-90-075) and September 28, 1990 (G02-90-162).
You provided additional information by letter dated February 25, 1991 (G02-91-037) in response to the staff 's request.
In each letter, you indicated that 349 channel boxes were to be reused in the upcoming cycle
( cycle 7). Your responses described the number and disposition of the affected channel boxes and the actions taken to assure compliance with the technical specification for thermal limits.
We have completed our review of your responses and find that it satisfactorily resolves the issues discussed in NRC Bulletin 90-02 for cycle 7
and that its application to any future channel reuse must be evaluated on a cycle specific basis.
A copy of our safety evaluation is enclosed.
This completes our efforts under TAC No. 76354.
If you have any questions regarding this issue, please contact me.
Sincerely, Original signed by Patricia L. Eng, Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation cc w/enclosure:
See next page DISTRIBUTION NRC I LP R
P
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NVi gill OF PEng OGC EJordan PD5 p/f ACRS (10)
RZimmerman, RV INC KE Cal'TER ggpj 0 C:LA PD5 DRPI NAME:DFos ter DATE: /
/91
- PM P
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ocumen arne:
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i
Mr. G.
C. Sorensen
'Washington Public Power Supply System WPPSS Nuclear Project No.
2 (WNP-2)
CC:
Mr. J.
W. Baker WNP-2 Plant Manager Washington Public Power Supply System P.O.
Box 968, MD 927M
- Richland, Washington 99352 G. E. C. Doupe, Esq.
Washington Public Power Supply System 3000 George Washington Way P. 0.
Box 968 Richland, Washington 99532 Mr. R.
G. Waldo, Chairman Energy Facility Site Evaluation Council Mail Stop PY-ll Olympia, Washington 98504 Mr. Alan G. Hosier, Licensing Manager Washington Public Power Supply System P. 0.
Box 968, MD 956B Richland, Washington 99352 Mr. A. Lee Oxsen, Acting Managing Director for Operations Washington Public Power Supply System P. 0.
Box 968, MD 1023 Richland, Washington 99352 Mr. Gary D. Bouchey, Director Licensing and Assurance Washington Public Power Supply System P. 0.
Box 968, MD 280 Richland, Washington 99352 Regional Administrator, Region V
U.S. Nuclear Regulatory Corenission 1450 Maria Lane, Suite 2lO Walnut Creek, California 94596 Chairman Benton County Board of Commissioners P. 0.
Box 190
- Prosser, Washington 99350-0190 Mr. R. C. Sorensen U. S. Nuclear Regulatory Commission P. 0.
Box 69 Richland, Washington 99352 Nicholas'S.
- Reynolds, Esq.
Winston 8 Strawn 1400 L Street, N.W.
Washington, D.C.
20005-3502
~p,S REoy, dp0 Op 0
C O
Vg
+**++
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATING TO EVALUATION RESPONSE TO NRC BULLETIN NO. 90-02 WASHINGTON PUBLIC POWER SUPPLY SYSTEM WASHINGTON NUCLEAR POWER UNIT 2 DOCKET NO. 50-397 1.0
.BACKGROUND WNP-2 is a C-lattice BWR and, as such, is less susceptible than a D-Lattice core to the phenomena of and effects from channel box bow.
Washington Public Power Supply System (WPPSS) is aware of the potential problems associated with channel box bow, and for that reason WPPSS had embarked on a channel management program since initial operation.
This channel management program consists of data collection on channel operating history and actual measurement of channel distortion as a function of channel operation.
The licensee s ultimate goal is to make the transition away from channel box reuse.
Beginning with the upcoming cycle, cycle 7, the effects of channel box bow wi 11 be addressed in WNP-2 reload design using the approved ANF methodology for determining the Safety Limit Critical Power Ratio (SLCPR).
The ANF data incorporated in the ANF methodology has been reviewed previously by the NRC and included WNP-2 measured data (Reactor D in this data base).
Analysis of the data indicated that WNP-2 is observing less channel box bow because WNP-2 is a C-lattice.
This data extends to an exposure of 50 GWD/MTU.
This safety evaluation covers the staff review of the Washington Public Power Supply System strategy for reuse of channel boxes in the upcoming cycle.
2.0 EVALUATION 2.1 Channel Box Characterization Channel boxes are selected for reuse by WNP-2 by establishing an accept/reject criteria based on "Distortion Allowance."
Discharged channel boxes are measured in the WNP-2 channel box measuring machine and the total maximum distortion (bow plus bulge) due to reactor operation is determined.
The licensee showed that total channel box distortion will vary along the channel with the maximum distortion value usually located near the middle of the channel.
The Distortion Allowance was developed based on the following relation:
Distortion Allowance
= Nominal Design Clearance - Calculated Future Distortion.
Used channel boxes are qualified for reuse if their measured distortion (from nominal) is less than the Distortion Allowance as developed from the above rel ati onship.
The licensee defines the Nominal Design Clearance as the nominal clearance between the channel box and the potential interference (in this case the control blade and/or Local Power Range Monitor (LPRM) as defined by the design drawings of the reactor core.
The Calculated Future Distortion is defined as the total distortion (bow plus bulge) as determined by the WNP-2 channel box model.
The model is based upon the expected future irradiation path of the fuel assembly upon which the channel box will be placed.
The licensee pointed out that typically, the future irradiation path is assumed to be five cycles at the interior of the core and one cycle on the periphery.
The amount of channel box bulge for the interior and the periphery is determined from the channel box bow model, assuming operation at 1005 power.
The model sums the results of the five cycles at the interior and one at the periphery to obtain a total expected bulge.
Similarly, channel box bow data is obtained from figures/plots generated by the channel box model for both the interior and periphery locations and again at assumed 100% power.
The total expected channel box bow and bulge are then summed to obtain the total expected channel box distortion.
With the Nominal Design Clearance known from design drawings and Calculated Future Distortion determined from the WNP-2 channel box bow model, the licensee is able to determine a Distortion Allowance value(s) for clearance of both the control blade and the LPRM for any given cycle.
Channel boxes with measured total distortion less than the control blade and the LPRM Distortion Allowances are qualified for reuse.
2.2 Estimated Ex osure and Maximum Calculated Channel Box Bow In their February 25 submittal, the licensee pointed out that the magnitude and direction of channel box distortion (bow plus bulge), is directly dependent upon the location history of the channel boxes.
The channel box that will have the largest estimated maximum at the end of cycle 7 is channel box designated 71927.
During cycle 7, this channel box is expected to be exposed to approximately 7.8 GWD/MTU with a total accumulated exposure at the end of cycle? of approximately 45 GWD/MTU.
The Supply System analytical model predicts a maximum calculated channel box bow for this channel to be equal to or less than 58 mils.
The model also predicts a maximum calculated channel bulge of 45 mils or less.
Consequently, the total predicted channel box distortion for this channel is less than or equal to 103 mils.
The exposures and channel box distortion for the remaining reused channels in WNP-2 are less (in some cases much less) than the values stated above.
2.3 Channel Box Measurement The Supply System has measured bow data on channel boxes out to exposures of approximately 31 GWD/MTU.
Their measured (maximum) data was compared to calculated data generated by the channel box distortion model.
The calculated values were found to be conservative relative to measured data (Reference 4).
2.4 Channel Box Bow Effects on the MCPR Limits The licensee indicated that it will take into account the channel box bow effects on the MCPR operating limit by modifying (recalculating) the
The WNP-2 SLMCPR was established through statistical considerations of measurement and calculations uncertainties, associated with the thermal hydraulics state of the reactor using design basis radial, axial and local power distributions and considering fuel channel box bow (Reference 5).
The effects of the channel box bow are included in the WNP-2 cycle 7 safety limit adjustment.
3.0 CONCLUSION
Based on the above evaluation, the NRC staff has concluded that the licensee's cycle 7 reload design with reused channel boxes and the methods used to account for the channel box impact on the core operating limits is acceptable.
The data and methodology used provide reasonable assurance that the thermal margin to the MCPR safety limit is maintained.
If in future cycles channel box reuse is continued, further review and prior approval by the NRC staff will be required.
Principal Contributor:
A. Attard Date:
April 22, 199$
4
4.0 REFERENCES
1.
G02-90-162, September 28, 1990, G.C. Sorensen (Supply System) to USNRC, "Nuclear Plant No. 2, Operating License NPF-21, Final Response to NRC Bulletin No. 90-02:
Loss of Thermal Margin Caused by Channel Box Bow".
2.
Supply System Interoffice Memorandum, from W.C. Wolkenhauer, Principal Engineer, to D.L. Whitcomb, Manager, Nuclear Fuel, November 13, 1990.
3.
G02-91-037, February 25, 1991, G.C. Sorensen to USNRC, "Nuclear Plant No. 2, Operating License NPF-21, Request for additional information regarding NRC Bulletin No. 90-02, "Loss of Thermal Margin Caused by Channel Box Bow".
4.
EANF-90-0434, November 13, 1990.
5.
Letter, 'August 8, 1990, A.C. Thadani, NRC to R.A. Copeland, ANF, "Acceptance for Referencing'. of Topical Report ANF-524 (p), Revision 2, ANF Critical Power Methodology for Boiling Water Reactor'.
'f