ML19324A063
| ML19324A063 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 03/31/1980 |
| From: | ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY |
| To: | |
| Shared Package | |
| ML19324A061 | List: |
| References | |
| CEN-131(M)-NP, NUDOCS 8006200428 | |
| Download: ML19324A063 (37) | |
Text
CEN-131 (M)-NP O-I e
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SUMMARY
OF FUEL INSPECTION RESULTS RECEIVED JUN 3 1980 Core Componen's Crc 99 Yankee Atomic Electri Com?.-ny March 1980 Combustion Engineering, Inc.
Wind o r, Connecticut 06095 l
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8006200 YSI
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LEGAL NOTICE THIS REPORT WAS PREPARED AS AN ACCOUNT OF WORK SPONSORED BY COMBUSTION ENGINEERING, INC. NEITHER COMBUSTION ENGINEERING NOR ANY PERSON ACTING ON ITS BEHALF:
1 A.
MAKES ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, WITH RESPECT TO THE ACCURACY, COMPLETENESS, OR USEFULNESS OF THE INFORMATION CONTAINED IN THIS REPORT, OR THAT THE USE OF ANY INFORMATION, APPARATUS, METHOD, OR PROCESS OlSCLOSED IN THIS REPORT MAY NOT INFRINGE PRIVATELY OWNED RIGHTS;OR B. ASSUMi s ANY LIABILITIES WITH RESPECT TO THE USE OF,OR FOR DAMAGES RESULTING FROM THE USE OF, ANY INFORMATION, APPARATUS, METHOD OR Pi40 CESS DISCLOSEQ IN THIS REPORT, e
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A
-MAINE VANKEL LOC
SUMMARY
OF FUEL INSPECTION R_ESULTS_
Fuel Assembly Sipping Campaign The fuel assembly leak test program (sipping) was completed on the entire Maine Yankee core during the outage at the end of Cycle 4.
Nine (9) fuel assemblies have been identified as containing leaking rods. These assemblies include 3 H Batch, 2 G Batch, 3 E Batch and 1 F Batch assemblies.
The G and E Batch assemblies had completed their second operating cycle; the F assembly completed its third and the H Batch assemblies their first cycle.
The assemblies containing perforated rods and their associated measured isotopic activities are presented in Table 1.
The location of each of the nine assemblies in Cycle 4 is given in Figure 1.
Visual Inspection of Fuel Assemblies A total of(
fuel assemblies were visually inspected following Cycit 4 in-cluding()assembliesexami.,nedtodeterminethenumber,ofrodscontdiningone or more ell,iptical surface anomalies as'a function of (Figure 2). (, of the Batch H assemblies inspected contained
. burnable poison rods with
,in place of the conventional Al 0 -B C shim material. The visual examination confirmed satis-23 4 factory perfonnan,ce of the bearing rods after one irradiation cycle in that no s
were observed.
of the nine assemblies identified by sipping as containing leaking fuel rods were also visually inspected.
The inspection revealed a total of perforated fuel rods in the assemblies (Figure 1).
of the perforated rods were observed in Batch H assemblies.
The approximate axial position of each of the perforations is given in Figure 3.
The core loading pattern devised by Yankee Atomic for. Cycle 4 included the use.of E batch assemblies in positions containing CEA's. For these E assemblies water rods were substituted for the burnable poison rods.
All
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t assemblies containing leaking fuel rods were to a Batch E assembly, at least on The location of the perforated rods appears to be Additionally, these peripheral E batch assemblies contain the group #5 CEAs, which are used as a regulating bank.
This regulating control rod bank was utilized during power changes just prior to primary coolant activity increases in February and March 1979.
/
Visual fuel inspections of the(,) batch assemblies appear to show relatively between grids (near the top of the assembly) compared to other regions of the assem'bly.
This is consistent with general observations which show increasing with increasing Visual observations in this region also showed
.'which varied from one assembly to another and tended to increase with the rods.
In an effort to detennine the distribut. ion of discolored elliptical surface anomalies throughout the core, fuel assemblies were visually examined to locate and count the number of
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fue' rods in each that contained one or niore of the anomalies. Fig'ure 4 show. cne number of 8
The incidence of these discolored elliptical surface anomalies for each fu'el batch is shown below:
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No. of Assemblies '
Total Number of Rods with
_ Examined Fuel Catch Surface Anomalies s
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The most af fected rods were located in assemblies near l.
(see Appendix A for a suninary of the assemblies observed with surface anomaiies).
As would be expected, the discolored elliptical' surface anomalies were observed in from assembly.to assembly.
However, several conclusions about the(
Jof the discolored elliptical surface anomatics and/or' generalizations can be made concerning these observations:
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Assembly and Single Rod Inspections g
A total of five fuel assemblies (H208, H214, H218, G123 and G132) determined by sipping to contain perforated fuel rods were disassembled for single rod eddy current testing.
Subject to reactor critical path scheduling requirements, the basic purpose of-this campaign was to purge the leaking fuel rods from each.of the five assemblies prior to reactor insertion for Cycle 5s Due to the uncertainties associated with the removal of fuel bundle H208 was chosen as the first candidate for disassembly because it contained the most observable lhe first fur:1 rods removed from
,(Table 2) were selectively chosen as
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a sample. for additional testing to further evaluate the surface anomalies observed during the fuel assembly visual examination program. The rods represented a The types of inspections that each of these rods were subjected to are summarized in Table 2.
Visual examination of the fuel rods removed from showed the to contain the discolored elliptical surface anomalies.
Furthermore, th'ese surfac+ anomalies &.re always rods did not contain the elliptical surface anomalies even though they' appeared to be as uniformly crudded as the rods.
Physics calculations also showed that the e
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As-indicated n Table 2, each of the fuel rods pulled frQn
]wereeddy fcondition.
current tested in the Rods were among those eddy current tested.
(These rods contained perforations that were observed during visual examination of 'the' fuel assembly).
The eddy current tests re-vealed i
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j in an effort to further clarify the eddy current results previously obtained, were retested at The results of these tests verified that
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A detailed visual. examination of'the regions giving-the indications re-vealedthatthe[
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FULL ROD PROFILOMETRY Profilometry was performed.o.n fuel rods that were removed from assembly for the detailed inspection. program (Table 2). The purpose of
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this additional testing was to:
The modes of profilometer testing included:
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Spiral scans -(0.25 inch pitch) of each fuel rod from the rod bottom into
.the plenum region.
- 2) Linear scans
- 3). Scans around the rod circumference at 9
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The types of scans performed on each of the rods that were' examined by
- profilometry are listed in Table 2.
Figure '5'sunnarizes the ovalities and average. diametral. strain as determined from the spiral profilometer scans for the rods tested.
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This infonnation'shows.
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Sunya_ry of Profilometry Observations r
The key observations made during review of the profilometry data include:
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Additional Fuel Rod Eddy Current Testing i
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L A total of' fuel rods were eddy current tested from the five assemblies that were recons'tiiuted.
Based on the results of the eddy current and visual
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exa'minaitons, a total of 44 fuel rods were discharged and replaccd with either solid Zircaloy duniuy rods for the Batch G's and 1.96 w/o U fuel rods for 235 the Datch H assemblies. Appendix B summarizes the rods tested and replaced for each of the five reconstituted assemblies.
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FIGUPI 1 CURE MAP Sil0 Wit 1G lill LOCAT10fl OF FUEL ASSEMBLIES DETEllMitlED TO C0i4TAlti LEAKittli RODS BY WET SIPPir4G 7l
-YOATH Assemblies that were. visually examined
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O indicates appropimate location of fuel rods observed to contain perfdrations l'i9ure t
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Figure 2
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MAlflE YAtlKEE-CYCLE'4 CORE MAP SH0 HIT!G THE.
FUEL ASSElGLIES THAT-'
WERE VISUALLY I:SPECTED.
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FIGURE 3
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MAINE YANKEE EOC-4: AXIAL POSITION OF FUEL R00 PERFORATIONS BY VISUALEXAMINATIONAND[
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- Malt 4E YAf1KEE CYCLE 4
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CORE IIAP SHOWIllG THE DISTRIBdtION l OF FUEL RODS _C0flTAINING ELLIPTICAL SURFACE At40f!ALIES ON ASSEftSLIES THAT WERE VISUALLY INSPECTED
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TABLE I
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-f ISOTOPIC ACTIVITIES FOR FUEL ASSEMBLIES F
C0tlTAltliflG LEAKIrlG FUEL RODS 1
(ACTIVITIES ARE IN MICR0 CURIES /ML WITH BASELINE SUBTRACTED).
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ASSEMBLY.
FUEL AVG. BURflVP v
NUMER BATCH (MWD /MTU)
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H208 H
13323 H214
.H 13415 H218 H
12193 G132.
G 22285 i
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APPENDIX A ASSEMBLIES CONTAINING ELLIPTICAL SURFACE ANOMALIES o
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_ ELLIPTICAL St'RFACE AN0MALIES o
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APPENDIX B y
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SUMMARY
OF RODS EDDY CURRENT TESTED AND-t DISCHARGED FROM THE FIVE
_ RECONSTITUTED' ASSEMBLIES t
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FUEL ASSEMB:.Y MYH208 4
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SUP9tARY Of RODS DISCHARGED FROM ASSEMBLY H208 9
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SUMMARY
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SUMMARY
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'0F RODS DISCHARGED FROM ASSEMBLY G123 i
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