ML19309H526
| ML19309H526 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley, North Anna |
| Issue date: | 05/08/1980 |
| From: | DUQUESNE LIGHT CO. |
| To: | |
| Shared Package | |
| ML19309H525 | List: |
| References | |
| PROC-800508, TAC-8595, NUDOCS 8005130460 | |
| Download: ML19309H526 (5) | |
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Beaver Valley 1 Endof-Cycle 1 On-site Fuel 8003130'50 Assembly Observations j
I.
Objectives During the initial refueling of the Beaver Valley 1 reactor, an on-site fuel inspection campaign was conducted between January 28, 1980 and February 14, 1980. The main objectives of the examination were to (1) binocular visually inspect all Region 1 fuel assemblies plus a sampling of Region 2 and 3 assemblies, (2) TV visually inspect 15 fuel assemblies (5 from each region), (3) crud sample 8 fuel assemblies, and (4) TV visually inspect 20 fuel assemblies for possible baffle leakage jetting.
II.
Binocular Visual Examination The binocular visual examination was conducted during.the unloading of the core.
Every assembly in the core was given a cursory binocular examination while being transferred from the upender to the spent fuel pit storage rack.
A total of 93 fuel assemblies listed in Table 1 were given detailed binocular visual examinations. These assemblies were paused in front of a drop light and rotated so that all four faces could be observed.
The overall condition of all of the assemblies was extremely good.
No damage to the grids, fuel rods, holddown springs, or nozzles was observed.
Crud appeared to be relatively thin. No unusual corrosion was noted.
The largest channel closure observed was estimated to be 80% (fuel assembly All, face 4, gridspan 1-2, rods 9-10). Approximately 33 instances of channel closures estimated to be >50% were observed.
Most of the channel closures observed occurred in the lower four gridspans.
III. Television Visual Examination A total of 15 fuel assemblies were examined and TV video recorded on all four faces at both high and low magnification. These assemblies are shown in Table 2 and include five assemblies from each region.
The assemblies were 1
specifically selected in order to best sample the range of assembly burnup, i
power, and core location during Cycle 1.
Another 20 assemblies were examined at high magnification on two corners to investigate if any baffle jetting 1
j had occurred.
These assemblies are.also shown in Table 2.
J l
Low magnification television-visuals verified the overal.1 int'egrity of the assemblies viewed. The fuel rods, grids, top and bottom nozzles, and holddown springs were not mechanically damaged.
Fuel rod to nozzle gaps were normal at both nozzles and ranged from approximately 1/4" to 3/4".
No incidence of a fuel rod in contact with either top or bottom nozzle was observed.
l High magnification television visuals of the 15 assemblies were used to obtain more accurate fuel rod bow performance data.
Rod bowing was very moderate in all 15 assemblies.
Eighteen closures out of 6,720 channels viewed were estimated to be >50% as noted during the TV taping.
Again, most of the closures observe 3 occurred in the lower four gridspans.
The majority of the channels were estimated to have (20% closures.
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Vertical high magnification visual scans were used to investigate any possible
- damage to the 20 fuel assemblies from baffle leaking jetting.
The fuel assemblies located at a baffle joint (Table 2) where the potential for jetting could exist were examined and no damage was observed.
During the TV visual examinations very small ' pieces (< 1/d") of debris were noted on eight fuel assemblies as indicated in Table 3.
The irregularities were viewed at high magnification.
However, their nature and origin could not be identified. Three of the assemblies were from region 1 and will be discharged. The remaining five assemblies were reviewed and the formal Westinghouse recommendation is that they be inserted into cycle 2 as is.. It is believed that the debriswill have no detrimental effect on fuel performance.
No unusual crud or corrosion was" observed during any of the visual examinations.
The crud appeared very uniform during the binocular examinations, hcwever, transitions from lighter to darker crud, mostly in the upper gridspans, was evident during the TV examinations.
It also appearrd to be very thin as judged during the binocular examinations.
Very little crud was observed coming off the assemblies during TV taping.
IV. Crud Samo11no Eight of the fuel assemblies which were TV examined (see Tabl.e 2) had crud samples removed and collected. Approximately six samples from various locations were obtained from each assembly. Only small amounts of crud were recovered during the sampling, confirming the binocular and TV visual observation that crud was very light. Nothing unusual was noted during the crud sampling.
Y.
Summary The fuel assemblies were in very good condition after one cycle of operation.
Mechanically the assemblies were in excellent condition with no damage to any grid, fuel rod, top and bottom nozzles, or holddown spring observed.
Channel closure was moderate to non-existent. C'rud appeared light and generally uni fo rm.
No significant anomalies were observed.
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j Table 1
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Beaver Valley 1 E0C-1 Fuc1 Assemblies I
Binocular Visualed Region I_
Reaion II Region III A-01' A-30 B-02 C-03 C-42 C-04 C-45 A-02 A-31 B-08 C-06 C-49 A-03 A-32 B-14 C-07 C-50 A-04 A-33 B-20 C-08 C-51 K-05 A-34 B-27 C-11 A-06 A-35 B-28 C-12 A-07 A-37 B-35 A-08 A-38 B-39 C-13 C-14 A-09 A-39 B-43 C-16
. /.-10 A-40 C-17 A-11 A-41
'C-18 A-12 A-42 C-19 A-13 A-43 C-20 A-14 A-44 C-21 A-15 A-45 C-23 A-16 A-46 C-24 A-17 A-47 C-26 A-18 A-48 C-27 A-19 A-49 C-28 A-20 A-50 C. 70 A-2:
A.1
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C-30 A-22 A-52 C-34 A-23 A-53 C-36 j
A-?A C ~.,,
A-26 A-20 C-38 C-39 A-28 C-4.
A-2'i O
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r Tabic 2
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Beaver Valley 1 EOC-1 Fuel Assemblies TV Visualed Examined at Hioh and low Macnification
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Region 1 Region 2 Region 3 A18, A29 A39 B04*, 807*, B13, C03, C06*, C15, A50*, A51*
B20*, B31 C39*, C49*
Examined for Baffle Leakage Jetting Region 3 C03, C07 COS, C10, C11, C13, C17, C19, C20, C21, C23, C24, C29, C30, C36, C37, C38, C42, C45, C51
- Crud samples were obtained from these assemblies.
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Table 3 i
Beaver Valley 1 E0C-1 Fuel Assemblics with Debri Observed on Them Fuel Assembly Face Grid Rod Comment A34 1
6 16/17 Debris on bettom of grid tab A29
,4 6
17
'Debrislodged in grid spring slot f
A51 3
3 5/6 B31 2
2 4/5 Debris on bottom of grid tab B31 3
5 7
Debrislodged in grid spring slot C08 2
1 14 a
C24 1
4 1
C39 4
1 17 CSI 3
4 5
9 4
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