ML20076N149
| ML20076N149 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 11/02/1994 |
| From: | Jandovitz J, Manning W, Nademus R GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20076N128 | List: |
| References | |
| TR-098, TR-98, NUDOCS 9411090232 | |
| Download: ML20076N149 (18) | |
Text
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'3. . .
Topical Report No. TR-09'8
<' . j .- Page 1 of-18 OYSTER CREEK CORE SPRAY SYSTEM INSPECTION PROGRAM - 15R OUTAGE i
TOPICAL REPORT NO. T' R-098 I
. Project No. 328352 i
f AUTHOR: A& %* /O- 3 /-7f -
'R. Nademus, NDE/ISI Engineer Date f
~
APPROVALS: b' $ !~ W W.PT Manhing, NDE/ Manager Date dD LW S. Ja vitz, Mkflager NDE/ISI iis M Dat'e Atit 1i//l94 S. Gif fdobbe, f){emistry/ Materials 6afe
[Al# x R. W. Keaten, Director Tech Functions eMn/
/ band /-
(Significant Impact Review) !
I 9411090232 941103
{DR ADOCK 05000219 PDR .
TR4148.RTN J
- . ' Topical Report No. TR-090
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ABSTRACT During the 1994 refueling outage (15R) at Oyster Creek Nuclear ,
Generating Station, an Augmented Inspection Program was implemented on the Core Spray Sparger System. This inspection scope included the in-vessel annulus piping and sparger assemblies utilizing i
remote visual examination and supplemental air test. Remote visual examination revealed no new relevant indications. The air test ,
revealed leakage seen in previous outages in System II at the known l 208* azimuth repair clamp and System I at the inlet piping coupling in the annulus. All anomalies noted had been previously reported.
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TR-008. RTN
. Topical Report No. TR-098 Page 3 of 18 l l
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TABLE OF CONTENTS l l
Page Introduction 4 Core Spray Sparger 5 Core Spray Annulus Piping 5 Air Test 6 Conclusion 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 i Figure 5 - Pipe Joint Configuration for Downcomers !
at 60 and 240* Azimuths l l
1 Figure 6 - Downcomer at 60 Azimuth and Location of I Weld U-3A Indications j Figure 7 - Downcomer at 240 Azimuth and Location of !
Weld L-3A Indication '
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- i Topical Report No. 'R-098
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Page 4 of 18 4
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OYSTER CREEK CORE' SPRAY SPARGER SYSTEM l
INSPEC. TION PROGRAM l
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INTRODUCTION l
The Augmented Inspection for the Core Spray Sparger System was performed during the 1994 refueling outage (15R). The results of the inspection reported herein meet the requirements outlined by Section 6.9.3.e. " Unique Reportino Reauirements", of the Oyster Creek Technical Specification.
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[ Topical Report No. TR-098 Page 5 of 18 VISUAL INSPECTION Core Soray Soarcers The Core Spray Spargers were visually inspected utilizing Westinghouse RTV 1250 camera with twin 50 watt underwater lighting affixed. Auxiliary lighting was provided as needed by Acorn lights and/or area lights lower into the vessel from the refueling bridge.
The Westinghouse camera does not utilize auto-iris for lighting control. However, auxiliary lighting was controlled by a rheostat.
The video camera was positioned in two fashions from the refuel bridge. The primary means of operating the camera system was utilizing an ABB rigid pole system mounted with a fixture to the refuel bridge. A secondary means was by hand held cameras manipulated by ropes. All accessible areas of the piping were inspected. The calibration standard utilized for qualification of the camera system was a 1 mil wire as a minimum in accordance with the requirements of NRC I & E Bulletin 80-13.
The visual inspection of the Core Spray Spargers were performed as follows:
Spargers A & C
- 1. Upper View - looking down on the sparger from above.
- 2. Front View - looking straight at the sparger. '
- 3. Lower View - looking up at the sparger from below.,
- 4. Nozzle View - looking below the sparger directly at the nozzles.
Spargers B & D
- 1. Upper View - looking down on the sparger from above.
- 2. Front View - looking straight at the sparger from a right angle and slightly below a right angle.
- 3. Nozzle View - looking below the sparger directly at the noczles.
NOTE: A total lower view is not possible for Sparger B & D because of their location in the vessel.
No relevant indications were noted during the inspections or subsequent review of the video tapes.
Annulus Piping i
Visual inspection of the Core Spray Annulus Piping was performed !
utilizing General Electric's (GE) " Firefly", a remotely operated submersible (ROV). All accessible areas of the annulus piping and attachments were inspected. Reference Figures 1 through 4. No relevant indications were noted during the inspection or subsequent review of the video tapes.
nesaw
. Topical Report No. TR-098
,' Page 6 of 18 AIR TEST l Air tests were performed on the Core Spray Sparger Systems I and I I -. Because of the configuration of the Core Spray piping, the upper spargers with downward pointing nozzles should filled completely with air on (system II). The down leg between the reactor vessel penetration and the horizontal circumferential pipe run in the annulus is filled completely with air. All other piping will, at best, fill only partially with air or just past air bubbles along its upper centerline inside surface.
The Core Spray Sparger Systems air test was performed in accordance with Procedure SP-91.01 Rev. 2 with Technical Change TC #9-29-94-1. ,
The pressure was held at approximately 72 psi as verifir.d t,hrough GPUN I&C Department.
Prior to the initial inspection of the System I (Lower Spargers) air bubbles were observed coming from the annulus area as noted in previous air test during refueling Outage 14R. These bubbles as noted in the referenced TR were leaking out of the fillet weld designated L-3A, 240' azimuth (see Figure 5 for joint configuration and weld type). The location of the leak was at the point along the circumference of the weld nearest the vessel wall. A direct straight on view of the weld was attained utilizing a water proof Elmo chip video camera. The video revealed three rounded indications at the lower toe of the weld. These rounded indications originated from initial fabrication. One of the three rounded indications emitted air bubbles while the System was under pressure. Once the pressure was reduced the air bubbles subsided.
Further inspection of the balance of the annulus piping revealed no additional air leaks.
SYSTEM I (Lower Spargers)
During the performance of the air test, the Core Spray Sparger System I, was inspected utilizing a hand held Westinghouse RTV 1250 camera manipulated with an attached rope from the refuel bridge.
Core Spray Sparger System I (Lower Spargers) was the first system tested. Inspection of this System during the air test noted air l bubbles coming from the nozzles. Air was trapped in the spargers and with no means of isolating the nozzles, air could escape.
Further inspection of the balance of the lower spargers on System I revealed no additional air leaks.
SYSTEM II (Upper Spargers)
During the performance of the air test, the Core Spray Sparger System II was inspected utilizing a hand held Westingnouse RTV 1250 camera as outlined in the inspection of System I above. In addition, the General Electric " Fire Fly", GE's remote operated submersible was utilized to observe the annulus piping during this phase of the air test.
t TR 048.RTN
. Topical Report No. TR-098 !
Page 7 of 18 1
Core Spray Sparger System II (Upper Sparger) was the second system inspected. In addition, the annulus piping was inspected at this stage of the air test. As pointed out during the System I air test, air bubbles were observed emitting from the sparger nozzles.
Air bubbles were also observed coming from the end (204 ) and middle (208") of the repair clamp located between azimuth 204 -
210*. No other air bubbles were observed coming from the other eight repair clamps, the spargers or the annulus piping other than that previously noted above.
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TR -098.RTN
Topical Report No. TR-098 Page 8 of 18 CONCLUSIONS l l
l The following are conclusions relative to the inspection of the Core Spray System conducted during the Oyster Creek Refueling Outage (15R):
- The number of confirmed cracks in the Core Spray Sparger Systems is one (1) in System II, t' hat being the through-wall crack at 208 identified and clamped in 1978 and confirmed by a continuous stream of air bubbles. No i change was noted from previous inspections.
e visual inspection of the spargers and annulus piping showed various scuff marks, scrapes, undercut *, arc strikes, oxide deposits and discolorations on the spargers surfaces. No change from previous inspections was noted.
- All repair clamps appear to be intact and in good condition, e No indication that could be interpreted as crack-like in appearance was noted during the examination or post examination review of the sparger assembly.
- One rounded, through wall, indication was observed at the toe of the weld designated as L-3A. This weld is in System I of the annulus piping. The rounded indication was discovered during the air test perform in outage 14R i and was determined to originate from initial fabrication of the component. I 1
e Two linear indications originally observed during Outage 14R in the annulus piping in System II Weld U-3A (reference TR-093). These indications were revisited ;
this outage (15R) and there appears to be no change and l no air bubbles were observed emitting from this location j during the air test. ;
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. Topical Report No. TR-098 Page 9 of 18 REFERENCES
- 1) NRC I & E Bulletin 80-13, " Cracking in Core Spray Spargers".
- 2) GPUN Procedure 5361-NDE-7209.46, Rev 0, Visual Examination of Reactor Vessel Internals.
- 3) GPUN Specification SP-1302-56-123, Rev 0, Reactor Vessel Internals Inspection 15R Outage.
- 4) GPUN Topical Report No. TR-093, oyster Creek Core Spray System Inspection Program - 14R.
TR 098.RTN
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TABLE I CORE SPRAY PIPING INSPECTION
SUMMARY
'- Scaraers Annulus Pipino Visual Ultrasonic Visual Ultrasonic Air Test Remarks 1978 1 through --
No indications --
Air release One Repair Bracket; wall crack observed from installed at 208*
I crack (208* (Sys II) only 1980 19 indications 16 indications 2 indications --
Seven Repair called cracks Brackets installed:
(Sys II) two repair i brackets installed (Sys I) 28 Total Indications (excluding 1978 indication) 1982 Video enhanced --
Video enhanced -- -- --
Video 1980 visual on 1980 indication Enhance- indications, Results Results: Not a crack ments identified: (6 x 5 reducer) 3 cracks 2 possible cracks 1983 No indications
- No indications
- No indications No indications *
- Area of Inspection' (4 of 1980 (5 of 16-1980 7 welds limited by repair indications indications inspected brackets examined) rechecked) 1986 No indications
- No indications
- No indications -- -- --
'?L8 No indications * -- No indications --
- Air release ** Air release observed from f rom 196* repair repair brackets bracket inter-upper sparger mittent. Air release from; 208' repair bracket con-tinuous-
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i Topical Report No. TR-098 Page 11 of 18 TABLE I (Continued)
CORE SPRAY PIPING INSPECTION
SUMMARY
Sparcers Annulus Pininq Visuai Ultrasonic visual Ultrasonic Air Test Remarks 1991 No indications * -- No indications --
Air release Air release trom observed from. 208* repair one repair bracket bracket (208*) continuous.
upper sparger. (Sys.II) 1992 No indications * --
Initial no --
Air release Air release from indications observed from 208*-repair bracket I repair bracket continuous (Sys.II)
- Additional Visual --
3 indications Air release from Air release from A) I through weld downconumer at weld L-3A is hole 240*. Weld L-3A continuous B) 2-linear has through weld (Sys.I) hole.
1994 No indications * --
No indications --
Air release Air release from observed from 208 repair crepair bracket bracket continu-ous (Sys.II) i Air release Air release from downcommer from Weld L-3A'
- Area of inspection limited by repair brackets at 240, Weld L-3A is continuous
- A subsequent air test confirmed that air bubbles were has through weld (Sys.I) released from the sparger nozzles beneath the 196* repair clamp, hole.
on. Weld U-3A (Sys.II).
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Topical Report No TR-098 Pece 12 Of IB CORE SPRA( NNJLUS PIPING AZIMUTH 0
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. . . . Topical Rsport No. TR-096
. Paga 16 of '8
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OYSTER CREEK CORE SPRAY SPARGER INLET PIPE COUPLING VESSEL WALL 6" SCH 40 PIPE CATION _
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e Topcel Report. Na TR-090 Pege 18 0F 18 CORE SPRAY PIP!NG WELO IDJS LEAKER AT WELD L-3A
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