ML17291A165

Forwards Response to NRC Bulletin 90-002, Loss of Thermal Margin Caused by Channel Box Bow, Correction to Cycle 10 & List of Reused Channels,Assemblies & Projected EOC 10 Exposures

ML17291A165
Person / Time
Site:	Columbia
Issue date:	06/20/1994
From:	Parrish J WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GO2-94-142, IEB-90-002, IEB-90-2, NUDOCS 9406290206
Download: ML17291A165 (8)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9406290206 DOC.DATE: 94/06/20 NOTARIZED: NO DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION PARRISH,J.V. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Forwards response to NRC Bulletin 90-002, "Loss of Thermal Margin Caused by Channel Box Bow," correction to cycle 10 &

list of reused channels, assemblies & projected EOC 10 exposures.

DISTRIBUTION CODE: IE11D COPIES RECEIVED LTR ENCL SIZE:

TITLE: Bulletin Response (50 DKT)

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PDIV-3 PD 1 1 CLIFFORD,J 1 1 INTERNAL: NRR/DE/EMEB 1 1 NRR/DORS/OGCB 1 1 NRR/DRPW 1 1 NRR/DRSS/PEPB 1 1 NRR/DSSA 1 1 NRR/DSSA/SRXB 1 1

/WIQI=Q 2 1 1 NRR/SCSB 1 1 G&~i~ 02 1 1 RES/DSIR/EIB 1 1 RGN4 FILE 01 1 1 EXTERNAL: NRC PDR 1 1 NSIC 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 15 ENCL 15

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Bax 968 ~ 3000 George Wasbtngton Way ~ Rlcbland, washington 99352-0968 ~ (509) 372-5000 June 20, 1994 G02-94-142 Docket No. 50-397 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

Subject:

WNP-2, OPERATING LICENSE NPF-21 RESPONSE TO NRC BULLETIN90-02: "LOSS OF THERMALMARGIN CAUSED BY CHANNEL BOX BOW," CORRECTION TO CYCLE 10 OPERATIONS

References:

1. NRC Bulletin 90-02, dated March 20, 1990, "Loss of Thermal Margin Caused by Channel Box Bow"

2. Letter G02-94-074, dated March 29, 1994, JV Parrish (SS) to USNRC, "Response to NRC Bulletin 90-02: 'Loss of Thermal Margin Caused by Channel Box Bow,'ffect on Cycle 10 Operation"

3. Letter G02-94-123, dated May 20, 1994, JV Parrish (SS) to USNRC, "Response to NRC Bulletin 90-02: 'Loss of Thermal Margin Caused by Channel Box Bow,'esponse to Questions on Cycle 10 Operation" INTRODUCTION NRC Bulletin (NRCB) 90-02 (Reference 1) requested that licensees reusing channel boxes verify that current Minimum Critical Power Ratio (MCPR) Technical Specification operating and safety limits are met. The most recent correspondence (References 2 and 3) updated the Supply System response to NRCB 90-02 for WNP-2 Cycle 10. A correction to the Cycle 10 update (Reference

2) is given below. This correction is required because of a channel identification problem that was detected during the current outage.

940b25'020b 940b20 PDR ADOCK 05000397 r~il Q nor ~

Page 2

.RESPONSE TO NRC BULLETIN90-02: "LOSS OF THERMALMARGIN CAUSED BY CHANNEL BOX BOW", CORRECTION TO CYCLE 10 OPERATION CYCLE 10 ORRECTI N The Supply System visually inspected the assemblies being rechanneled, checking the serial numbers of both the channel being removed and the one being installed. During this inspection, it was determined that channel 71806 was installed on assembly UD5034 during the refueling outage performed in the spring of 1990 rather than stored in the Spent Fuel Pool as planned. The inspection also detected that during the spring 1990 refueling outage two other reused channels being discharged, 71908 and 70158, were swapped. Evaluation shows that the exposures of channels 71806, 71908 and 70158 at discharge at the End of Cycle 9 were below 50 GWd/MTU.

Because of the above discovery, an additional visual inspection of all reused channels that are in the Cycle 10 loading was performed to ensure that there were no other occurrences of this problem in the Cycle 10 loading. This inspection confirmed that all reused channels are installed on the correct fuel bundles as listed in Table 1 (Attachment 1).

Reference 2 reported channel 71806 would be reused on assembly UD5064. Channel 71771 rather than channel 71806 will be reused on assembly UD5064 which is located at row,column position 6,10 of the core. The projected exposure for the End of Cycle 10 on channel 71771 is 28,482 MWd/MTU. Table 1 has been revised to show the correct channel ID and estimated End of Cycle 10 exposure for channel 71771.

In summary, there is no significant impact associated with the correction of channel identifiers as described above. Table 1 updates Attachment 2 of Reference 2, otherwise there is no change in the request and evaluation in Reference 2. Also this change does not alter the Supply System's response to questions on Cycle 10 operations given in Reference 3. As stated in Reference 2, the Supply System will continue to use its channel bow methodology to assure that reused channels will not interfere with control blades or in-core instrumentation. NRC approved methods for accounting for channel bow effects in the MCPR Safety Limit will also continue to be used.

Page 3 RESPONSE TO NRC BULLETIN 90-02: "LOSS OF THERMALMARGIN CAUSED BY CHANNEL BOX BOW", CORRECTION TO CYCLE 10 OPERATION Should you have any questions or desire additional information regarding this matter, please contact me or P. R. Bemis at (509) 377-4027.

Sincerely, J. 'V. sh '(1023 Asiistan an'ing Director r Operations JDT/sic Attachments: Attachment 1 - Reused Channels, Assemblies, and Projected EOC 10 Exposures CC: LJ Callan - NRC RIV JW Clifford - NRC KE Perkins, Jr. - NRC RIV, Walnut Creek Field Office NRC Sr. Resident Inspector - 927N NS Reynolds - Winston & Strawn DL Williams - BPA/399

STATE OF WASHINGTON )

Subject:

Response to NRC Bulletin 90-02, "Loss of

) Th rm 1Mar in ed h nn 1B xB w COUNTY OF BENTON )

I, J. H. SWAILES, being duly sworn, subscribe to and say that I am the WNP-2 Plant Manager for the WASHINGTONPUBLIC POWER SUPPLY SYSTEM, the applicant herein; that I have the full authority to execute this oath; that I have reviewed the foregoing; and that to the best of my knowledge, information, and belief the statements made in it are true.

DATE , 1994

.S ails

-2 lant M ager On this date personally appeared before me J. H. SWAILES, to me known to be the individual who executed the foregoing instrument, and acknowledged that he signed the same as his free act and deed for the uses and purposes herein mentioned.

GIVEN under my hand and seal this ~day of V Q 1994.

Notary Public in and for the STATE OF WASHINGTON Residing a My Commission Expires W

ATTACERVIKNT1 Table 1 Reused Channels, Assemblies and Projected EOC 10 Exposures Current Proj EOC 10 Row Column Assembly Channel ID Exposure 1 13 UD4032 62686 33603 1 14 AN3036 63602 47970 1 15 XN2087 71965 42174 1 16 XN2095 70104 42297 1 17 AN3008 71758 47894 2 15 UD5066 71780. 49138 12 AN3133 71982 32252 4 19 AN3134 71827 32580 5 5 AN3031 71389 47043 5 7 UD4115 70190 36612 5 11 AN3064 72035 49039 5 20 AN3028 72474 48856 5 26 AN3029 72439 46495 6 10 UD5064 71771 28482 7 5 UD4024 73124 37075 7 13 UD5071 71938 46301 7 26 UD4022 73386 44105 8 3 UD5030 71848 49294 8 10 UD4025 71473 29800 8 28 UD5035 71983 48904 9 11 UD5063 71898 29041 9 29 UD5013 73228 29385 10 10 UD4034 73151 33700 10 23 UD4031 71754 29177 11 13 UD5070 71803 29334 11 26 AN3124 71376 48972 12 30 UD4029 73117 33262 13 13 UD5072 71902 28976 14 1 AN3080 5866D 39640 14 14 UD5069 73223 32571 14 30 AN3001 71790 48568 15 1 XN2084 71936 42199 15 14 UD5065 61550 49149 15 30 XN2067 73582 42779 16 1 XN2066 61972 35985 16 9 UD5036 71946 33123 16 17 UD5021 71459 32744 16 22 UD5022 71987 33118 16 30 XN2100 71959 36061 17 1 AN3002 62283 39724 17 UD5039 73362 32690

Table 1 (Cont.)

Current Proj. EOC 10 Row Column Assembly Channel ID Exposure 17 14 UD5028 73053 32696 17 17 UD5025 73378 30915 17 21 UD5033 73127 28456 17 27 UD5031 70202 32595 17 29 UD5026 61750 48451 17 30 AN3122 71928 45625 18 13 UD5011 73172 29164 18 24 UD5029 73138 33011 19 2 UD5010 73150 30791 19 10 UD5040 73149 33004 19 29 UD5024 73109 30824 20 5 AN303 7 72037 48889 20 13 UD5017 71798 29357 20 26 AN3129 71442 48660 20 29 UD5023 73069 47613 21 1 UD4012 71950 35822 21 2 UD4042 71989 29894 21 14 UD5009 73439 16872 21 19 UD5038 71972 32701 21 29 UD4135 71975 47999 21 30 UD4134 70167 32930 22 1 UD4143 72042 34327 22 15 UD5016 71204 33064 22 16 UD5037 73170 33072 22 30 UD4140 71801 32218 23 2 UD4016 71904 36252 23 29 UD4139 73132 32660 24 3 UD4144 71434 33533 24 13 UD5020 71939 32992 24 28 UD4142 6028D 39523 25 4 UD4038 73403 34868 25 5 UD4021 73423 29727 25 26 UD4003 72030 30037 25 27 UD4083 71953 34929 26 5 AN3044 73422 47041 26 7 UD4011 71792 36921 26 11 AN3018 71431 48639 26 24 UD4132 63950 36620 26 25 UD4030 71854 29867 26 26 AN3047 73133 44402 27 6 UD4040 71786 37044 27 12 AN3102 71753 44114 27 14 UD5014 73369 32492 27 19 AN3065 71976 46869 28 7 UD4027 71393 33820

Table 1 (Cont.)

Current Proj. EOC 10 Row Column Assembly Channel ID Exposure 28 8 UD5018 73589 30428 28 24 UD4008 71907 33614 29 8 UD4028 73368 32736 29 9 UD5008 70209 29086 29 12 UD5004 70159 30662 29 16 UD5034 63510 30427 29 20 UD5032 70243 47597 30 10 UD4039 71835 34732 30 11 UD4116 71392 33546 30 12 UD4138 71334 32657 30 13 UD4006 71954 35439 30 14 AN3014 71985 48017 30 15 XN2065 71921 35791 30 16 XN2052 61526 35767 30 17 AN3015 72014 48117 30 19 UD4136 70103 32695 30 20 UD4004 73444 41246 30 21 UD4007 73426 34398