ML19261A821
| ML19261A821 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 01/30/1979 |
| From: | Justin Fuller PUBLIC SERVICE CO. OF COLORADO |
| To: | Speis T Office of Nuclear Reactor Regulation |
| References | |
| P-79026, NUDOCS 7902080203 | |
| Download: ML19261A821 (9) | |
Text
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83 January 30, 1979 Fort St. Vrain Unit No. 1 P-79026 Mr. Themis P. Speis, Chief Advanced Reactor Branch Division of Project Management Office of Nuclear Regulation Washington, D.C.
20555 Dockett #50-267 Subj ect:
Region 35 Inspection Refererice : Speis to Fuller Letter January 22, 1979 Gentlemen:
Per our discussion during the November 4 open meeting, we are trans-mitting for your information our general inspection plan for inspecting Region 35 during the upcoming refueling outage.
In your letter of January 22, 1979, you made inquiry as to inspection plans for other regions in light of the November 4,1978, fluctuation, We are planning to refuel Regions 5,10,17, 21, 28 and 35 during the upcoming outage.
A general visual inspection of the upper core plenum for each region will be made with the reactor viewing device prior to conmencing fuel removal of the region, but we have no plans for any additional detailed inspections or surveillances of these regions other than Region 35.
The remainder of your inquiries in the January 22, 1979, letter will be addressed in separate correspondence.
Very truly yours, J. "..
uller, Vice President Engineering and Planning JKF/DWW:il 0
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s FORT ST. VRAIN NUCLEAR GENERATING STATION INSPECTION PLAN OUTLINE, REGION 35 Prepared by: Don Warembourg Date: 1-19-79 I.
General The following outline provides the general inspection plan for inspecting Region 35 during the upcoming refueling outage. The inspection will consist of six (6) major areas as follows:
1.
General core visual inspection 2.
Core Region 35 block removal and inspection 3.
Visual inspeccion, Region 35 core support structure 4.
Dimensional inspection, Region 35 boundaries 5.
Block inspection, selected elements of Region 35 6.
General Core Mapping, Fuel element location, Reg' n 35 The fuel handling machine (FHM) reactor viewing device (RVD) and the FHM viewing device will 'e utilized for in-core visual inspections. The FHM grapple head will be utilized for in-core dimensional inspection and core mapping;the hot service facility (HSF) will be utilized for visual inspection of the individual elements.
II.
General Core Visual Inspection 1.
Utilizing the FHM grapple head /RVD a general inspection of the upper partion of core will be performed, as indicated in Table A.
2.
An inspection of the core orifice valves of regions 18, 34, and 3C, will be performed to include visual observation for the following:
A.
Valve stroke from full closed to full open to o'n;erve travel for unusual movement or binding.
B.
Inspection of valve internals in full open position if possible.
C.
Inspection of inner valve in full closed position for unusual wear marks if possible.
. Inspection Plan Outline, Region 35 (continued)
III.
Core Region 35 Block Removal' Inspection The element removal sequence for Region 35 is shown in Figure 1.
Utilizing the FHM/RVD and the FHM viewing device, inspection will be performed as follows:
1.
The blocks and surrounding area vill be examined at each level of Region 35 before removal.
2.
The sides of the blocks will be viewed in the FHM after removal from the core and two (2) pictures (180* apart) will be taken by the FHM viewing device.
3.
The video tape will be utilized in all viewing segments.
4.
The blocks will be inspected as outlined in Table B.
5.
The visual inspection of Region 35 surrounding area will include those items outlined in Table C.
IV. Visual Inspection Region 35 Core Support Structure and Walls Upon removal of Region 35 the FHM/RVD shall be utilized to 1.
visually 4.spect the Region 35 core support structure and to re-examine the caryon walls of Region 35, as necessary.
2.
The inspection shall consist of those items outlined in Table C.
V. Dimensional Inspection, Region 35 Boundaries 1.
Utilizing the FHM grapple head tangential, radial, and vertical readouts, in conjunction with a strip chart recorder and computer location data, measurements are to be made in eight (8) separate areas of Region 35, as indicated in Figure 2.
Inspection of these areas shall be performed as follows:
A.
The FHM grapple head will be positioned, utilizing previously established tangential and radial coordir.ates for the top metal plenum element.
B.
Grap21e head will be moved radially against the surface to be inspected to obtain a pre-established radial deflection.
C.
Grapple head will be moved vertically down the face of the area being inspected at a speed of approximately 2 in/sec. Data will be recorded on the strip chart recorder and also monitored in digital readouts.
D.
Data will be analyzed to determine block displacement or excessive gaps between blocks.
, Inspection Plan Outline, Region 35 (continued)
VI.
Block Inspection, Selected Elements of Region 35 1.
Ten (10) blocks have been selected for visual inspection in Hot Service Facility (HSF). The location of these blocks is shown in Figure 1.
2.
The ten (10) blocks will be stored in the FHM during the sequenced removal of Region 35.
Upon completion of the removal of Region 35, the FHM will be positioned on the HSF for removal and inspection of the selected blocks.
3.
Blocks will be inspected utilizing the general inspection plan outlined in Table B.
Blocks will be observed at four (4) different positions as follows:
A.
Bottom of block as it leaves the guide tube B.
Rotation of the block through 360*
C.
Top of the olock (in two separate positions 180* apart) after release by the FHM.
D.
Observation will be compared with initial inspection records established for these blocks during initial fuel loading.
VII. Core Mapping 1.
Utilizing computer data, the locations where each block in Region 35 is picked up will be recorded for comparison with theoretical locations to verify uniformity of the blocks at each level, i
FIGURE 1 BLOCK REMOVAL SEQUENCE Region 35 Secuence No. for l
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block removal of Region 35.
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2.
4 27 28 19 3c 31 33 34
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4 1
4 2
4 2.
3 3
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Re on 35 Boundary Areas For Dimensional Inspection
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T.1 B L E A
CORE VISUAL INSPECTION COMPONENT CRITERIA INSPECTION RESULTS*
1.
Thermal Barrier No bowed or buckled plates; no distortion or surface damage.
Seal sheets between cover plates.
2.
Upper edge of core Barrel Upper edge shape is barrel and top uniform. No distortion at
- reflector keys key and barrel interface.
Key assembly and bolting
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arrangement is in tact. No distortion at key and reflector block interface.
3.
Upper Plenum Elements No tipped or displaced elements, uniform color and appearance. Gap uniformity between; (1) Plenum elements in a region (2) Plenum elements between regions and (3) Plenum elements and permanent side reflectors 4.
Control Rod Guide Tube.
No distortion; fully engaged with plenum elements.
No Region Orifice Valves wear marks at valve / plenum R18, R34 and R36.
element interface.
5.
Side Spacer Blocks No tipped or displaced elements. Uniform color uniform gap between; (1) spacer blocks & core barrel, (2) spacer blocks & side re-flector and (3) spacer blocka.
6.
Permanent Side No tipped or displaced blocks; Reflector Blocks uniform gap between adjacent reflector blocks and reflector blocks and spacer blocks.
- Include description of exact location for specific results.
TABLE B
Block No.
BLOCK VISUAL INSPECTION COMPONENT CRITERIA INSPECTION RESULTS*
- 1.. Dowels & Sockets of fuel /
No cracks or chips.
reflector block.
2.
Pads on Plenum Elements.
No indication of impact, rubbing or deterioration.
No cracked or shipped edges.
3.
Key and key slots of Plenum Elements.
4.
Fuel / Reflector Blocks.
No cracked or chipped edges.
No indication of impact or rubbing.
No displaced blocks.
- Include description of exact location for specific results.
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TABLE C
VISUAL INSPECTION OF REGION 35 SURROUNDING AREA COMPONENT CRITERIA INSPECTION RESULTS*
1.
Region 36, 34 and 18 Gap size is uniform alorg Faces & Gaps between entire length of column.
adjacent Fuel /Reflectcr No indication of impact, Columns of each region rubbing or deterioration, and between regions.
no cracked or chipped edges.
2.
Gap at position "A" as Uniform along entire length shown by Ficure 2.
of column, no excessive gaps.
- Include description of exact location fcr specific results.
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