ML20154R498
| ML20154R498 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/20/1998 |
| From: | Manning W, Nademus R, Slear D GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20154R491 | List: |
| References | |
| TR-119, NUDOCS 9810270049 | |
| Download: ML20154R498 (19) | |
Text
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Topical Report No. TR-119 Page1ofl9 Oyster Creek Core Spray System Inspection Program - 17R Topical Report No. TR-119 Project No. 320005 1
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4 Topical Report No. TR-119 Page 2 of19 Abstract During the 1998 refueling outage (17R) at Oyster Creek Nuclear Generating Station, an augmented Inspection Program was implemented on the Core Spray Sparger System. In addition to the augmented program, GPUN performed visual examinations per the recommendation of the BWRVIP, (Boiling Water Reactor Vessel and Internals Project), document BWRVIP-18, " BWR Core Spray Internals Inspection and Flaw
(
Evaluation Guidelines". The inspection scope included the in-vessel annulus piping, sparger assemblies, and sparger brackets utilizing remote visual examination and supplemental air test *. In accordance with the above reference document, BWRVIP-18, under the BWRVIP reinspection approach the following inspections were performed:
All welds with a crevice in the annulus piping,25% or better of butt welds in the annulus piping, the sparger end cap welds, sparger nozzles, sparger piping, all repair clamps, and 25% of sparger brackets. Cleaning with a nylon brush was necessary for the end cap welds, welds with a crevice and annulus piping butt welds. These items were inspected to the VIP enhanced VT technique called EVT-1, with % mil resolution. A best effort approach to clean and EVT-1 inspect the sparger T-Box welds was done. All 4 (four) of the T-Boxes are clamped and very little weld is accessible for inspection. The nozzles and brackets were inspected to the BWRVIP visual technique, CSVT-1 or 1 mil resolution. Remote visual examinations revealed no new indications. The air test revealed leakage reported in previous outages in System 11 at the 208
- azimuth repair clamp and the fillet weld L-3A at the downcomer at 240, System I. This also was reported as a through weld hole in previous outages.
Oyster Creek performed a baseline's inspection per BWRVIP-18 during the 16R outage,1996.
4 Topical Report No TR-119 Page 3 of 19 7MBE OF CONTENTS Page Introduction ~
4 Core Spray Sparger 5
Core Spray Annulus Piping 6
Air Test 6
Conclusions 8
. References 9
Attachments Table 1 - Core Spray Piping Inspection Summary Figure 1 - Core Spray Annulus Piping Azimuths Figure 2 - General Layout - Core Spray Sparger Figure 3 - Upper Piping Unit Figure 4 - Lower Piping Unit Figure 5 - Pipe Joint Configuration for Downcomers at 60 and 240 Azimuths j
Figure 6 - Downcomer at 60 Azimuth and Location of Weld U-3A Indications 4
Figure 7 - Downcomer at 240 Azimuth and Location of Weld L-3 A Indication 4
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Topical Report No. TR-119 Page 4 of 19 OYSTER CREEK CORE SPRAY SPARGER SYSTEM INSPECTION PROGRAM INIRODIN'110N The Augmented Inspection for the Core Spray Sparger System was performed during the 1998 refueling outage (17R). The results of the inspection reported herein meet the requirements outlined by "Section 6.9.3.d Unique Reporting Requirements", of the Oyster Creek Technical Specification.
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Topical Report No. TR-119 Page 5 of 19 Visual Inspection The Core Spray Spargers and Annulus piping were visually inspected utilizing the IST, ETV-1250 underwater camera with the twin 50 watt underwater lighting afrixed and the REE RJ-2100 color camera. Auxiliary lighting was provided as needed by acorn lights and/or area lights lowered into the vessel from the refueling bridge. Auxiliary lighting was controlled by a rheostat. This inspection program has exceeded inspections prior to 16R by conforming to the BWRVIP, Reference 6 Page 9. The video tapes were reviewed by at least two visual Level III individuals. Agreement of the individuals was required to finalize the disposition of these inspections.
Core Sprar Soareers Accessible portions of the end cap welds on the spargers, (8 places), were cleaned using a nylon brush attached to an underwater motor. These welds were inspected utilizing the (BWRVIP) enhanced VT-1 designated as EVT-1. This technique uses a % mil wire for camera / system resolution. The remainder of the spargers were inspected to the CSVT-1 technique using a 1 mil wire for camera / system resolution. Oyster Creek utilized the refueling bridge and an auxiliary bridge to perform these inspections. The primary means of operating the camera system was by hand held camera manipulated by ropes. A portable pole system from the refueling bridge was used when accessibility permitted.
The calibration standards used for qualification of the camera system were as stated above.
The visual inspection of the Core Spray Spargers was performed as follows (Reference Figure 1 & 2):
Sparger A & C i
- 1. Upper view -looking down on the sparger from above.
- 2. Front view - looking straight at the sparger.
- 3. Nozzle view - looking below the sparger directly at the nozzles and tack welds.
Sparger B & D
- 1. Upper view - looking down on the sparger from above.
- 2. Front view - looking straight at the sparger.
- 3. Nozzle view - boking below the sparger directly at the nozzles and tack weids
- 4. End cap welds - Waned and EVT-l.
Topical Report No. TR-119 L
Page 6 of19 1
No relevant indications were noted during the inspections or subsequent review of the video tapes.
Annulus Pining Accessible portions of the Core Spray Annulus Piping welds (Figures 3 through 7) were cleaned using a nylon brush and visual inspections performed utilizing the EVT-1 technique. All accessible portions of the following piping welds were visually inspected: U2, U3, U3A, U4, U5, U6, U13, U14, U15A,U21, U22, U23, U24, & U24A on System II; and L2, L3, L3A, L4, L9, L10, Lil, L12, L13,L13A, Ll 7, L18, L19, &.L20 on System I, (See Figure 3 & 4)
Inspections were performed using the ETV-1250 camera system. No new relevant indications were noted during the inspection or subsequent review of the video tapes.
Air Test Air tests were performed on the core spray system I and II spargers. Because of the configuration of the Core Spray piping, the upper spargers with downward pointing nozzles were filled completely with air (System II). The down leg between the reactor vessel penetration and the horizontal circumferential pipe run in the annulus was filled completely with air. All other piping j
was partially filled with air orjust passed air bubbles along its upper inside surface.
The Core Spray Sparger Systems air test was performed in accordance with GPUN Spec. SP-1302-22-007, rev. 3. The pressure was held at 70 PSI for System Il and 80 PSI for System I, as verified through GPUN I&C Department.
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Topical Report No. TR-119
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Page 7 of 19 System 1 (Lower Spargers)
During the performance o he air test, the core spray sparger system I, was inspected c
utilizing a hand held IST EiV-1250 camera manipulated with an attached rope from the bridge for the annulus piping. The REES RJ2100 attached to a hand held pole was used for the sparger inspections.
Inspection of the sparger during the air test noted air bubbles coming from the nozzles.
With no means ofisolating the nozzles, air escaping is normal during this examination.
Inspection of the balance of the lower spargers on system I revealed no additional air leaks. Air bubbles were observed from the downcomer at 240, weld L-3 A as previously observed.
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System 11( Upper Spargers)
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During the performance of the air test, the core spray sparger system II was inspected utilizing a hand held IST ETV-1250 camera manipulated with an attached rope from the bridge for the annulus piping. The REES RJ 2l00 attached to a hand held pole was used for the sparger inspections.
As pointed out during system I air test, air bubbles were also observed emitting from the sparger nozzles. Air bubbles were also observed coming from the end (204 degrees) and middle (208 degrees) of the repair clamp located between azimuth 204 - 210 degrees. No other air bubbles were observed coming from the other eight repair clamps, spargers or annulus piping other than that previously noted above.
o Topical Report No. TR-119 Page 8 of 19 Conclusions The following are the conclusions relative to the inspection of the Core Spray System conducted during the Oyster Creek Refueling Outage (17R):
The number of confirmed cracks in the core spray sparger systems is one (1) in system II, that being the through wall crack at 208 degrees identified and clamped in 1978 and confirmed by continuous stream of air bubbles. No change was noted from previous inspections.
Visual inspection of the spargers and ant.ulus piping showed various scuff marks, scrapes, undercut, arc strikes, oxide deposits, (in locations that had not been bmshed), and discoloration's on the sparger surfaces. No changes from previous inspections were noted.
All repair clamps appear to be intact and in good condition.
No indications that could be interpreted as crack like in appearance were noted during the examination or post examination review of the sparger assembly.
One rounded, through wall, indication was observed in the toe of weld designated as L-3 A. This weld is in System I of the annulus piping. Visual examination during 17R and previous air test revealed no change in this indication since it was discovered in 14R. This indication was determined to be a fabrication flaw.
Two linear indications originally observed during outage 14R in the annulus piping in system II, weld U-3 A appear to be a weld pass between 2 beads, as determined after cleaning. No changes and no air bubbles were observed emanating from this location during the air test.
Topical Repon No. TR-110 Page 9 of 19 Beferences 4
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- NRC I&E Bulletin 80-13," Cracking in Core Spray Spargers" 1
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2 - GPUN Procedure NDE-VIS-04, Rev.1, " Visual Examination of Reactor Vessel Internals",
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' 3 - GPUN Specification SP-1302-56-130, Rev.1," Reactor Vessel Internals inspection - 17R" 4 -- GPUN Topical Report No. TR-i10," Oyster Creek Core Spray System Inspection Program -16R" 5
5 - GPUN SP-1302-22-007, Rev.3," Core Spray Sparger Piping Air Test" 6 - BWRVIP-18,"BWR Core Spray Internals inspection and Flaw Evaluation Guidelines" 4
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Topical Report No. TR-119 Page 10 of 19 TABLEI CORE SPRAY PIPING INSPECTION SUNINI ARY Sparrers Annulus Piping Visual Ultrasonic Visual Ultrasonic Air Test Remarks 1978 1 through wall crack No indications Air release observed One repair bracket installed at from I crack (208 208 (Sys. II) only) 1980 19 indications 16 indications 2 indications Seven repair brackets installed (Sys.II) two repair brackets installed (Sys.1) 28 Total Indications (excluding 1978 indication) 1982 Video enhanced 1980 Video enhanced on visualindications Results 1980 indication identified:
Results: Not a 3 cracks crack on the 6x5 2 possible cracks reducer) 1983 No indications
- No indications
- No indications No indications
- Area ofinspection limited by (4 of the 1980 indications (5 of 16-1980 7 welds inspected repair brackets examined) indications examined) 1986 No indications
- No indications
- No indications 1988 No indications
- No indications
- Air release
- Air release from observed from repair 196 repair bracket intermittent brackets upper Air release sparger from 208 repair bracket
Topical Report No. TR-110 Page 11 of 19 TABLE I (Continued)
CORE SPRAY PIPING INSPECTION SUMM ARY Sparrers Annulus Pipine Visual Ultrasonig Visual Ultrasonic Air Test Remarks 1991 No indications
- No indications Air release observed from one Air release from 208 repair repair bracket (208 ) upper sparger bracket continuous (Sys. II) 1992 No indications
- Initial no indications Air release observed from one Air release from 208 repair repair bracket bracket continuous (Sys. II)
Air release from downcomer at Air release from weld Additional Visual 240 Weld L-3 A has through L-3 A is continuous (Sys.1) 3 indications weld hole A) I through weld hole B) 2-linear 1994 No indications
- No indications Air release observed from repair Air release from 208 repair bracket bracket continuous (Sys.II)
Air release from Weld L-3 A i Air release from downcomer at continuous 240, Weld L-3 A has through weld (Sys. I) hole No change from 2 linears Not on Weld U-3A (Sys.II) 1996 No indications *
- * *No indications Air release from one repair clamp Air release from 208 repair bracket (Sys. II)
No visu:i c ange to indicatio in U-3 A (Sys.II)&L-3 A(Sys.
Topical Report No., TR-119 TABLE I (Continued)
CORE SPRAY PIPING INSPECTION
SUMMARY
Sparrers Annulus Piping Visual Ultrasonic Visual Ultrasonic Air Test Remarks Air release from one repair bracket. Air Air release fium 208 1998 No indications
- No indications release from downcomer at 240 weld repair bracket (Sys. II)
L-3A through weld hole.
No visual change to indication in U-3A Sys.II & L-3A(Sys. I)
Area ofinspection limited by repair brackets A subsequent air test confirmed that air bubbles were released from the sparRer nozzles beneath the 1% repair clamp
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