ML033430355
| ML033430355 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 11/24/2003 |
| From: | Cayia A Nuclear Management Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BL-01-001, BL-02-001, BL-02-002, NRC 2003-0112 | |
| Download: ML033430355 (36) | |
Text
N_
Committed to Nuclear Excellen Point Beach Nuclear Plant Operated by Nuclear Management Company, LLC November 24, 2003 NRC 2003-0112 10 CFR 50.54(f)
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units I and 2 Dockets 50-266 and 50-301 License Nos. DPR-24 and DPR 27 Supplemental Response To NRC Bulletins 2001-01, 2002-01, And 2002-02 For Reactor Vessel Head And Vessel Head Penetration Nozzle Inspection Findings
Reference:
- 1) Letter from Nuclear Management Company, LLC to Document Control Desk, "Thirty-day response to NRC Bulletins 2001-01, 2002-01 and for 2002-02 for Reactor Vessel Head and Vessel Head Penetration Nozzle Inspection Findings', dated November 15, 2002.
In the referenced letter, Nuclear Management Company, LLC (NMC), provided its response to Bulletins 2001-01, 2002-01, and 2002-02 regarding reactor vessel head and vessel head penetration nozzle inspection findings obtained during the refueling outage of Point Beach Nuclear Plant (PBNP) Unit I that was completed on October 16, 2002 (U1 R27). This response included a discussion of the inspection scope and results, details of the non-destructive examination used, and the acceptability of the limited ultrasonic testing (UT) examinations performed on four of the forty-nine penetrations.
During an additional review of U1 R27 control rod drive mechanism (CRDM) ultrasonic data by Framatome ANP in August 2003, it was discovered that in eleven (11) of the twenty (20) CRDM nozzles inspected with the rotating probe head, probe rotational stalling occurred that was not identified during the initial data analysis. The effect of the probe stalling resulted in areas that were not covered by all six inspection angles contained in the rotating head. Scans using the UT blade probes were unaffected by this situation.
6590 Nuclear Road
- Two Rivers, Wisconsin 54241 Ac D 9 Iz Telephone: 920.755.2321
Document Control Desk Page 2 Although undetected tool slippage occurred on a small percentage of the nozzles, the inspections performed support the conservative engineering evaluations previously performed and continue to provide assurance of the structural integrity of all PBNP Unit 1 vessel head penetrations. The analysis in the referenced letter continues to bound this condition.
Since this condition impacted the information that was provided in the referenced letter, a supplemental response is proved in the enclosure to this letter.
Framatome ANP notified NMC of this condition in September 2003 and issued a Framatome Nonconformance Report (NCR) 602883. A copy of NCR 602883 is included with the enclosure to this letter. NMC subsequently informed the Point Beach resident NRC inspector and NRC Region III staff of this condition. Framatome ANP has modified the subject tooling to prevent recurrence of this condition in future outages. This modified tooling was deployed at PBNP during U2R26 (October 2003) and operated appropriately.
This letter contains no new commitments and no revisions to existing commitments.
I declare under penalty of perjury that the foregoing is true and accurate. Executed on November 25, 2003.
A. J.
yia Site ic-President, Point Beach Nuclear Plant Nucle anagement Company, LLC Enclosures cc:
Administrator, Region Ill, USNRC Project Manager, Point Beach Nuclear Plant, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC
ENCLOSURE 1 PBNP Unit I Reactor Pressure Vessel Head and Vessel Head Penetration Nozzle Inspection Discussion Introduction In the referenced letter, Nuclear Management Company, LLC (NMC) submitted its results of inspections performed on the reactor vessel head and vessel head penetration nozzle inspection findings during the refueling outage of Point Beach Nuclear Plant (PBNP) Unit i that was completed on October 16, 2002. During an additional review of Ul R27 control rod drive mechanism (CRDM) ultrasonic data by Framatome ANP in August 2003, it was discovered that in eleven (I1) of the twenty (20) CRDM nozzles inspected with the rotating probe head, probe rotational stalling occurred that was not identified during the initial data analysis. The effect of the probe stalling resulted in areas that were not covered by all six inspection angles contained in the rotating head. Scans using the ultrasonic testing (UT) blade probes were unaffected by this situation.
This supplemental response provides our revised evaluation of the inspection results.
Only changes to the previously reported inspection results are included in this correspondence.
PBNP Unit I Inspection Scope and Results Visual Examinations The slipping of the Framatome ANP UT inspection tooling had no effect on visual exams performed.
Ultrasonic Examinations NMC to NRC letter dated November 15, 2002 discussed limitations in scanning of four (4) of the thirty-three (33) nozzles with thermal sleeves using the UT blade probe.
These limited scans were justified to be acceptable through engineering analysis. The slippage to the rotating tool head did not affected these scans and therefore, this information will not be presented again.
All nozzles without thermal sleeves (16) were examined using a rotating probe UT technique. Four (4) other penetrations were also scanned with the rotating probe following removal of their thermal sleeves. A total of twenty (20) nozzles were examined with the rotating probe. It is in the population of twenty (20) nozzles that the new lack of coverage was discovered. Details on the equipment malfunction that caused this lack of coverage are included in nonconformance report (NCR) 602883, which is enclosed to this letter.
Page 1 of 5
During the additional review of the U1R27 CRDM examination data it was observed that the weld profiles shown in the C-scan images were not symmetric on 11 of 20 nozzles examined with the rotating probe. Further investigation of the images suggests that the probe stalled during a portion of the rotation. This caused limited coverage of the affected nozzles. Although the entire circumference was examined with at least one transducer, not all of the six transducers in the inspection head covered the entire circumference.
Rotating UT was performed on nozzle numbers 1, 6-9, 31-37, & 42-49. The nozzles affected by probe stalling are 8, 31-33, 36, 37, 42, & 44-47. The unaffected nozzles were determined not to have stalled byverifying the symmetry of the weld profile and matching the elevations of the upper and lower edges of the J-groove weld at the beginning and end of the scan rotation.
Nozzle 1 is in the center of the head and so there is no detectable change in the weld symmetry because the geometry is constant around the circumference. This nozzle was verified to have complete coverage by doing a detailed comparison of landmarks detected at the weld fusion interface with the blade UT examination that was also performed on this nozzle.
UT examinations and "UT leak path" were also affected in the eleven (11) nozzles. The stall conditions resulted in some portion of the circumference where the transducers used to make the leak path assessment were not scanned. Table 1 summarizes all limitation in UT scans performed during U1R27. Forthe eleven (11) nozzles that had slippage of the rotating tool, no coverage percentage is listed in the table. This information is discussed in NCR 602883 (enclosed) due to the varying coverage percentage by transducer.
Page 2 of 5
1-..
Table I Revised Inspection Summary Penetration(s)
Coverage Description 1
100%
Indications of possible fabrication-related flaw indications found through blade probe UT examination. Thermal sleeve removed to initiate repairs. 100% rotating UT performed with sleeve removed. Indications determined to be weld fabrication-related with the more accurate rotating probe UT. No indications found with confirmatory PT examination. No repairs required. Thermal sleeve reinstalled.
2 -7 100%
No indications. No restrictions or limitations.
8 Tool Rotating probe tool slippage occurred. Coverage limitation Slippage detailed on pages 4-5 of the enclosed NCR 602883 discussion.
9 - 25 100%
No indications. No restrictions or limitations 26 78%
No indications. Limited blade probe coverage justified through engineering analysis.
27 66%
No indications. Limited blade probe coverage justified through engineering analysis.
28 52%
No indications. Limited blade probe coverage justified through engineering analysis.
29 100%
No indications. No restrictions or limitations.
30 50%
No indications. Limited blade probe coverage justified through engineering analysis.
31-33 Tool Very limited initial coverage using blade probe due to physical Slippage restrictions. Thermal sleeve removed. Rotating probe tool slippage occurred. Coverage limitation detailed on pages 6 -11 of the enclosed NCR 602883 discussion. Nozzle 32 had weld fabrication-related indications only. No flaw indications. Thermal sleeve installed.
34 -35 100%
No indications. No restrictions or limitations.
36 - 37 Tool Rotating probe tool slippage occurred. Coverage limitation Slippage detailed on pages 12 - 15 of NCR 602883 discussion.
38 - 41 100%
No indications. No restrictions or limitations.
42 Tool Rotating probe tool slippage occurred. Coverage limitation Slippage detailed on pages 16 - 17 of NCR 602883 discussion.
43 100%
No indications. No restrictions or limitations.
44 -47 Tool Rotating probe tool slippage occurred. Coverage limitation Slippage detailed on pages 18 - 25 of NCR 602883 discussion.
48 - 49 100%
No indications. No restrictions or limitations.
Page 3 of 5
Flaw Tolerance Evaluation Circumferential cracks located in the nozzle material are the area of prime interest due to the safety concern arising from nozzle ejection and loss of coolant accident (LOCA).
Therefore, a flaw tolerance evaluation, postulating a circumferential flaw in the region that was not interrogated by the UT examination was performed by Westinghouse Electric Company.
In the Letter from NMC to NRC dated November 15, 2002, a discussion of the acceptability of an assumed 180° flaw was presented. This evaluation concluded that the time required for a postulated 1800 circumferentially oriented flaw to grow to a point of structural instability (330°) to be approximately 25 years of operation. The evaluation used plant specific stresses and operating temperature and the MRP-55 crack growth rate predictions. The UT results and the cited evaluation established that there were no concerns with the structural integrity of the vessel head penetrations (VHPs) associated with the possibility of undetected circumferential cracking in the non-inspected areas over at least the next operating cycle.
This evaluation bounds the lack of coverage documented in Framatome (NCR) 602883 as all nozzles with rotating tool slippage had coverage that exceeded 1800 circumferentially.
Probabilistic Evaluation As described in the Letter from NMC to NRC dated November 15, 2002, Westinghouse Electric Company performed a probabilistic analysis on the subject of lack of coverage.
This work determined, with at least 95% confidence, that the seven penetrations with initial limitations in examination coverage would not produce an axial or circumferential flaw that would exceed the assumed critical sizes over a time interval of up to 14.5 additional effective full power years (EFPYs). This conclusion was based on conservative assumptions in average crack size, stresses influencing crack growth, and inspections performed to date.
The results of the probabilistic analysis were then evaluated using the plant specific probabilistic risk assessment (PRA) to determine the potential risk significance of this activity. NMC conservatively postulated that a critical failure would lead to a medium LOCA with an equivalent diameter of more than 2 inches. The corresponding change in core damage frequency for this scenario was calculated to be less than I E-6/year.
These results demonstrate a very small change in plant risk and are consistent with the guidance contained within Regulatory Guide 1.174.
This probabilistic evaluation is still considered applicable as each of the eleven (11) nozzles that had rotating tool slippage had coverage with at least one transducer for 100% of the nozzle circumference.
Page 4 of 5
100% Visual and Other UT Examinations The detailed 100% UT examinations of a large majority of the CRDM nozzle and of the reactor pressure vessel (RPV) head vent line surface areas, with no evidence of cracking or leakage, give assurance that primary water stress cracking corrosion (PWSCC) of the PBNP Unit 1 VHPs is not occurring. This is also evident in the results of the 100% visual examination performed on the RPV head exterior surface.
PBNP Unit 1 Inspection Summary In the referenced letter, NMC provided its response to Bulletins 2001-01, 2002-01, and 2002-02 regarding reactor vessel head and vessel head penetration nozzle inspection findings obtained during the refueling outage of PBNP Unit 1, that was completed on October 16, 2002 (U1R27).
As discussed in the previous sections, it was discovered that in eleven (11) of the twenty (20) CRDM nozzles inspected with the rotating probe head, probe rotational stalling occurred that was not identified during the initial data analysis. Framatome ANP notified NMC of this condition in September 2003 and issued a Framatome NCR 602883.
Although undetected tool slippage did occur on a small percentage of the nozzles, the inspections performed support the conservative engineering evaluations previously performed and continue to provide assurance of the structural integrity of all PBNP Unit 1 VHPs.
By letter dated March 3, 2003, NMC consented to the requirements listed in NRC Order EA-03-09, "Issuance of Order Establishing Interim Inspection Requirements for Reactor Pressure Vessel Heads at Pressurized Water Reactors." During the next refueling outage for PBNP Unit 1 (UI R28 - April 2004), NMC will perform UT, PT, and visual examinations that comply with the requirements of NRC Order EA-03-09.
The PBNP Unit 1 RPV Head is scheduled for replacement during the subsequent refueling outage (U1 R29 - Fall 2005).
Page 5 of 5
ENCLOSURE 2 Framatome ANP, NCR 602883, Revision I (and associated discussion)
22144-8 (3/2002)
- ~~~~~~~~~~~
I i
Pz - A.~~~~~~~.
I,^
FRAMATOME ANP;
.. NONCONFORMANCE REPORT WORKING INSTRUCTION WI-9 I
NCR#
16028873
- - l REV.ft 1-- -
PAGE 1-OF 2
I SECTION I INITIATION I CONTRACT #:
1221016 CUSTOMER/SITE/UNIT:
NMC / Pt. Beach Unit 1 TECHNICAL DOCUMENT#: ISI-100-09
' -'SEQUENCE/STEP#:
DESCRIPTION OF NONCONFORMANCE/CONDITION:
QA INITIATED During a review of CRDM ultrasonic data performed in preparation for'the Unit 2 outage, it was discovered that in eleven (11) of the twenty (20) CRDM nozzles inspected with the rotating probe head, probe rotational stalling occurred that was
.not identified during the initial data analysis. The effect of the probe stalling resulted In areas that were not covered by all six inspection angles contained in the rotating head.
INITIATOR:
M. W. Key
- - (NAME):
SENT TO:
Bob Cole DATE/TIME:
09/21/2003 12:00 AM TAG PLACED D
I ~
YES NO REQUESTED COMPLETION DATE:
9113012003 (NAME)
I SECTION2 RESOLUTION ANDDISPOSITION N NCR CLASSIFICATION:
SIGNIFICANCE LEVEL:
DISPOSITION OF NCR:.
i0- SAFETY-RELATED i l
a' NON SAFETY-RELATED a
ASME COI 1
III I
El I l
E,
' ;l
' El NONE-0 REWORK/REINSPECT El REPAIR/RE-INSPECT
0 USE AS IS
)DE El REPLACE 0 'OTHER:,
DISPOSITION:
The impact of the stalled rotation of the probe has been evaluated and is discussed in detail in the attachment to this NCR. It has been determined that there is no region of the affected nozzles that has not been examined with at least one beam direction. It has been shown through MRP demonstrations and empirical data from cracked nozzles that one beam direction is sufficient to detect cracking.
The rotating probe uses multiple transducers looking In both the axial and circumferential beam directions as well as straight beam and has redundancy to allow Improved characterization of detected cracks.- Rotating UT data acquired during the last MRP demonstration for CRDM UT examination capability was evaluated using only two channels (ch2 and ch3) In order to assess the detection capability in the limited regions where all transducers were not scanned. Each of the affected nozzles has regions where only ch3 was scanned.
EPRI evaluation of the demonstration results are attached and will be forwarded to the -utility so-that the safety significance can be evaluated.
CAUSE:-
Personnel CAR/RO REQUIRED - El YES 0
NO NUMBER VENDOR (if applicable)
PREVENTATIVE ACTIONS:
Perform formal training with all RV head inspection crew members'on site prior to RV head inspections in the fall of 2003.
Document this via a PTR. Evaluate the tool design for any possibility of tool slippage and correct any issues. Complete a SDCN to procedure 54-ISI-100 requiring personnel to perform appropriate checks to ensure no occurrence of slippage.
Revise CRDM Data Analysis Course outline to include instruction on verifying 360 degree coverage with all transducers.'
APPLICABLE TO OTHER CONTRACTS:
0 YES E
NO RESOLUTION:
Perform a review of all nozzle examinations performed to date using the bottom-up tool for rotating UT to determine if other examinations are affected. Have a separate analyst perform an independent review of each nozzle to ensure accuracy.,
.w-AFFECTED ORGANIZATION:
NDE Services RESPONSIBLE INDIVIDUAIJENGINEER:
SCHEDULED COMPLETION DATE:
9130/03 CC Ranson 10/3/03 ZE)
(NAME)
(DATE)
=..R 0
QA El Al INSPECTOR J(SIGNATUF 0
CUSTOMI APPROVAL REQUIRED:
[:3 ANI/ANII
..- 22144-8 (3/2002)
NONCONFORMANCE REPORT CONTINUATION`.
WORK INSTRUCTION WI-9 NCR#-
602883 REV.#.
1 l
PAGE 2
OF 2
l SECTION 3 DISPOSITION APPROVAL i
REVIEWER:
r/./
Js
- . 1...
- KJ Hacker
,/(SIGNATURE).
UNIT MANAGER:'
(See Note I Below!
e c RA'S0-A {(,GNATURE)
CUSTOMER APPROVAL:
. (NAME)
I RF Cole
- (NAMEY.
L447m-
. I 1013103 -
(DATE) 10/3/03 (DATE)
(DATE)
N/A (DATE)
(If required)
ANIIANIIIAI / Inspector I (If required)
Z 1/2. 2.(SIGNATURE)
(NAME)
Review
-N/A -
7.,
(SiGNATURE)
. ' -1
- ;8c-^
.;li _rJ I
((NAME)
QA Approval 2
NA Simile *_I
_______3 (If reauired)
(
" (SIGNATUREY
,e::
(NAME)
(DATE)
Note:.-
For significance Level' 'and 11 NCRs,theUnit Managers signature indicates that the CAR/RO actions have been completed or for a CAR that work may continue. 2.
SECTION 4 DISPOSITION COMPLETION-
_~~~~~~~~~~~~~~~~~~~~~~
,4..
THE DISPOSITION ACTIONS SPECIFIED IN SECTION HAVE BEEN COMPLETED.
.,VERIFIED BY:
CRP-6 (?
5O'I.' ro/
02 p-/o3 (tiGNATUJREj -I NAME)..
(DATE QAVERIFICATION:
Jo I (If required) t
-z-
';U(SIGNATURE1
.*'i.
0,:
' (NAME)--
(ATE)
_SECTION 5 PREVENTATIVE-ACTION COMPLETION'
- --i 1,
.,.I. "
THE PREVENTATiVE ACTI6dNS SPlEIFIED th.S-EG1iON HAVE BEEN COMPLETED. THIS NCR IS CLOSED.
VERIFIEDBY:
z ;
-,4, 1(IGNATUREV QA VERIFICATION:
(if required)
(SIGNATURE)
- {(NAME)
(DATE)
.:-I- -..
.(NAME)
(DATE)
DISTRIBUTION Project Engineer Records Management - - T5.16 Other SM Wright Unit Technical Manager;, Bob Cole-.,
2 QA.
Nick Simile.
Specify S
IIi
NCR1#t6028873, Rev. 1 Discussion:
During a recent review'6f the PtL.B1ach; Unit 'l- (UlR27),'CRDM'examination data it w~as observed thaftthe weld 'profiles' showhi in'the C-bca'n' images were not symmetric on 1I of 20 nozzles examined 'With`the r6tating p'robe' rmounted on the
.bottom-up delivery tool. Further..investig'ation of-the images suggests that the probe stalled during a portion of the rotation:. This'caused limited coverage of the affected nozzles.. Although the erntire'circumference was'Nexarnined -with at*Ieast ohe transducer,:'notall of the six transceres innthe' inspection head covered the entire circumference. The scan pattern performed for th'e examination was a v -
raster with the probe scanning along the.nozzle axis! to ithe'specified scan
'limits and then indexing circumferentially to cover af1iil 360 degrees.
.~t,de...,,.
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.as.,
- -. -., Th'e tooling used to deliver the I
probe fr~tis examination is referred 'to as' the bottom-up tool. The' probe is'mountdd on a shaft that extends through the c6nter of the rotatingnmechanism and is secured to the'rotating mechanism with a clam'
- shell type cla-Ip that contains 'ii to eng e '.hble "in the probe shaft. 'It appears that the pin.was not:engaged with ;the hole in the shaft during a portion of some scans. For a portion of each affected scan, 'without.pinrengagement'the clam shell provided coupling of the Shaf to the -rotating m1echanismr allowing the shaft to'- rotate :in' the intended,'ashion--when-coupled.' The circumferential encoding is linked to the rotatirig m66n'ecismi,- nofdthe probe shaft.'-'Because the; circumferential encoding was functioning rhormally, the scans executed as intended(-5 'deg.' to'365 deg.) and fulft' coverag'was-believed'to have'been achieved. There 'was no problem with'the axiai encoding..
Up'on'discvery f the problem, discu I6i r'held with th'lead data analyst assigned to Pt. Beach for the outage, performed in October 2002, to determineif these 61'nolieswere&oticed'dunihg;'th o'rosite',data"' an 2'toys. eTheie ifalYst stated Ith't the 'anom6ale's -.,we're ':bb'se'ledd
'nd_.discus'sed,'with the tooling:
technicians duririg'fle exa'minition'fbe-a'usdie'it was suspected that the toolhbad stalled during rotations. 4However, when the tooling technicians investigated they.
responided'thatfthe todl'Wasrotating propery. T he stalled condition would only be evident 'if a frictional load was applied to the head as when it was inside a nozzle.. The analyst then assumed that the anomalies were due to asyrnmetri6 weld conditions and that there was no' probiem with the data. This was an inaccurate.assessment...---
Rotating UT was performed on o'zzle numbers 1', 6, 7, '8, 9, 31, 32, 33,'34, 35, 36, 37, 42, 43, 44, 45,'46,'47-, 4-,;arnd'49. 'Ti e nozzles'affected by probe stallirig are '8, 31 32, 33,' 36,: 37, 42, 44M,'45, Z46, arnd 47. Review bf the data' showve the stall condition occurring near the end of the scan on nozzle 42 at 1310 hrs. 'Th6 scanning continuedihat same day;with the rotating probe until 2137 hrs. in that time span, nozzles 37, 8, 47,46, 36, 7,>r'd 45 were examined '(in thatorder) and all had the stall condition evident in the data display. On the 'next day, nozzles 35, 7, and 43 were scanned (7 was rescanned for some reason) and the stall 1 of 26
NCR 16028873, Rev. 1 condition was not present on any of thosq. nozzles. Ten days, later, after the thermal sleeves'had been removed to provide access, nozzles 31, 32, and 33 were examined between 1801 hrs and 1901. hrs. These nozzles also had the stall condition evident in the, data. This ti'eline, shows that the stall conditions were limitedo specific blocks of time bounding the affected nozzles..
The unaffected. nozzles were,'determined-not to; haves'stalled conditions by yerifying the; symmetry1 of'th'e. weld, profile and matching. the, elevations of the upper and lower edges 'of thie. J-groove weld at thebeginning and end of the scan rotation, Circumferential overlap exists at,¢the beginning and end of the scan to allow this comparisori to occur.
Nozzle 1 is in the center of the head and so there is no detectable change in the weld symmetry because the-geometry-is.-constant around'-the circumference.
This nozzle was Verified. to, have.
coveragem by doing a detailed comparison of landmarks detected at the weld, fusion interface with the. blade' UT examination that was also performed on this nozzle. B6sed' on this' correlation, we can conclude that the rotating' probe was rotating for the entire circumference of the nozzle.' Also, nozzle I was 'not examined in the windows~of time where the stalling occurred. The remaining nozzles were examined' with a different type of tool, using a blade probe due to the presence of thermal sleeves and are not affected.
The rotating probe contained 6 transducers. Five of the six transducers are on one side of the probe and the sixth transducer is approximately 180 degrees out from the five. Therefore, when the stalling occurred, the result was that not all of the transducers covered the entire circumference. The coverage obtained for each transducer on the nozzles'with stalled c6nditions is listed in the following tables. UT images of the affected nozzles 'are also attached.
Leak path determinations with UT were also impacted on the affected nozzles.
The stall conditions resulted in' some portion of the circumference where the transducers used to make the leak path assessment were not scanned. Those limits are listed in the tables and are designated as channel 7 for the purposes of generating the graphs that show the coverage for each'of the transducers.
The 'detection capability of the rotating probe was assessed on MRP mockups.
The initial demonstration did not define capability on a channel by channel basis but rather as an aggregate performance for all six of the active channels. In
'order to determine the impact of not scanning the entire circumference with' each of the transducers the MRP demonstration data was reanalyzed separately for channel 2 (30 deg TOFD) and channel 3 (60 shear looking down). These two channels were. selected because, between these two channels, the entire circumference of each of the affected nozzles was examined. The-results of the analysis of the MRP data for these channels were submitted to EPRI for 2 of 26
NCRC#6O28873, Rev. 1 evaluation.
The EPRI 2repor'F'-n. 'detection capability using only these two channels'is attached.
Based on observations'from the MRP demor'stratioin program, it was found that axially aimed transducers, 'otimized.for circumferential flaw'detection,i also detected flaws that were off axis relative to the beam direction. 'The degree of this off'axis or-iehtation -. was inr'so'i~e 'ca'ses up to and including 90°.
This detectioriability to observe off axis,-a'is was-inherent in the circumferentially
.airned transducers as 'eel!.-'-'The atta'cied' MRP demnonstration results should be consulted to'make assessnmer.ts;o":t',-'dete'ition" capability' based on the use of channels 2 and 3 only.'
? ~~~
.~c i The following tables identiiy -he&'-itp'eciricG-overage obtained for each of the affected nozzles., The UT image'-s,,lso attach6'd and annotated to identify the location of the stalled probe condition'
~~~~~~~~~~~,it.-., *.f.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.
'.~~~~~~~~~~~~~~~~~~~~~~~~~~1 3of26
NCR X6028873, Rev. I Nozzle.8 Area effected:
min.:
max:
Total:
- 93.
182 89 Beam Probe..
Limitation Channel Degree Direction Defects Lcation Start End 1
0 normal vol 0
93
.182 Nozzle 8 2
30-L, I.axial circ 338 71 160' 3
60-S axial circ 158 251 340
.4 45-LE, circ.
axial 0
93 182 5
60-SE circ axial 22 115 204 6
60-SE circ axial 338 71 160
.7 0,2OL, 45LE Leak Path.
- combined 93 160
- - ~~~~~~*
-a. --
t A
The chart provides inforrnation on' th4;`channel;,bea'm angle, beam direction, probe location within the head, and 'scan start fiend points.> In addition, th6 leak path coverage is provided. The angular position of the limitation is relative to the downhill side of nozzle which equals 0 deg.' The-limitation' valu6s listed above are in degrees.
.. t.
1 a
., II 7...
C C,
8
'7 6
5 4.
3 2
1 n.
aJ *
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- 0 45 90 135 180 225
- .270 315
- s aa.' Degrees hi 360
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4 of 26
NCR #6028873, Rev. i Nozzle 8 H]-:
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~
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~
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Horizontal line denotes the stall area.
5 of 26
NCR #6028873, Rev. 1 Nozzle.31 vI Area effected:
min.:
max:
Total:
274 360 86 Beam Probe Limitation Channel Degree" Direction Defects, - Location, -Start End 1
0 l normal vol 0
274 0
Nozzle 31 2
30-L--
axial circ -
338 252 338 3
- 60-S;,
-axial circ 158' 72 158 4
45-LE circ axial 0
274; 0
5 60-SE circ'- -
axial 22.
296 22 6
60-SE circ.
axial 338 252 338 7
0, 30L, 45LE Leak Path combined 274 338 The chart provides information'on the, ch'annel, beam angle;' beam direction, probelocation within the head, and,.scan.,start:l end points., In-'addition,: the leak path-coverage, is provided.-.Th; angular' position of'th'e limitation'is relative to the downhill side of nozzle which 'eq'uals
-T are in degrees.
- f ' -
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,i. '-;
era;',e'.:,,'
8 N,-
- v~o~zle 31 Coverage, ___'
8 -
6 01 al-....................... ;
+
3-2 0
45
- 90.
.135 180.
225 270 '
315 360 Degrees 6 of 26
NCkR#6028873,-Rev. 1 No~ze 31 i.'-. 'a
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Clip L...AI 10001 Horizontal line denotes the stall area.
7 of 26
NCR #6028873, Rev. 1 Nozzle;32 Area effected:
min.:
max:
Total:,
259
.13 127 Beam Probe Limitation Channel Degree-Direction Defects Location Start'. End 1
.0.
..normal
,vol 0
J259 13.
Nozzle 32 2
30 -L:
axial circ 338..
237
.351 3
60-S
- axial.
circ.
'158.1 57~ 1171 4
45-LE j. circ-...
axial:,
.0 259 713 n-.
,iir,
- ).
1 I
99
<R I.
4 -
6
. 60-SEe I
circ axial 338 237.
351-7 0; 30L, 45LE Leak Path.
combined 259 35 1 The chart' provides informratin on.:the channel,..beam angle, beam direction, probe location within the~ Nead, and' scan 'start l end points. In.addition, the leak path coverage is provided. -. The 'an'gular'position' of th'e limitation 's relative'to the downhill side of nozzle which equals 0.degj.. The' limitation values listed; above are in' degrees.
-. :T,'.,!'^, '
Q :--- !
, *'l, a
,',,1'
,p,,.............,,3<t,:
'.5 t +, F,, ',,4,.,j\\-,,
A'!
@ ~~~~~~~~~~~~~~~,3. ',<,,
-; l..
/.'.-! i' ' ' ',
, 8
.7 2
1 6
I
,~~~~~~~~~~~~~~~'7J'!:!77 V
~~~~ 4.
A1,~
`7 71777.".
1
- 'i' O'
45 90*
4 ',1.35'.A.>.J80 *..
-225-' 61i270 '--"
3i5 :
... D grees I 3 6&
5 :...'
4 '
8 of 26
NCR #6028873, Rev. I 4'1
- lNozzie'32 FT~ ~77Aadt~e*DI# I
-[AZ 75T19O12G-(ffioze.Z~rtaii)F
-5.001 THETP.(dC6)
- ~*
~Si.ooI 0.659f 087
( H 2?2 60.8571ethin 1461 Horizontal line denotes the stall area.
9of26
NCR #6028873, Rev. 1 Nozzle 33 Area effected:
min.:
max:
Total:
115 244 129 Bearm Probe Limitation Channel Degree Direction' Defects Location 'Start. End 1
0 normal..- vol
- 0
- 1. 5 244 Nozzle 33 2
30-L-axial circ 338 93
. 222 3
60-S axial -- - circ.
158 273 42 4
45-LE circ4 axial 115 244 5
60-SE circ
-axial
-137 266 6
60-SE- -
circ axial 338 93 222.
7
,-0,30L,45LE
- -,-LeakPath I combined 115 222
- f Z
.....!'8..
S, The chart provides information on.the'channel, beam angle',. beam direction, probe location within the head, aWd. scan'start /iend'points In addition, the leak path coverage is provided. The'angular position of the limitation is relative to the downhill side of nozlel'which equalslOdeG The limitation'values'listed above are in degrees.
~~~.2rth.s 5)
,i..Us p
~~~~~~~~~~~~~~
.q
.t,-......
-r:.-
- 3.
'4 f
4~~~~~~~x P
.~~~~~"Y 8
6 5
C 4
. 2.
-tt 3.
2 1
- 0
.-.II
'oze33'C64era ge'
.54 MIC r7 T
Ii. -
t;1 m TT.;ttz
_4-
..! , 1:
, I
'i
- : i -I t..-
,I
.-I
..V
.5-1 I
.I' 0
45 90 r
1 135 180 225 ' K..-;270 315i
- ! 5oi" Degrees e!'K.;: ^
I,,
.i360 10 of 26
NCR #6028873, Rev. i No'zze 33
- I I
I1.2 I<.-:
- ,"~,V <. 7 A77~
WeXCDI rTA2275T2051 24' I
-: : 1." --!:! ; : !- ", I F. I F I rDI I IChari-s I:~ I F[P-iakj 6"ExO~~ZI II
~~~
L1-4 I
E u
~~~~~~~~~~~~~~~00
-65.201
~~~THETAW deg)-'
301.00j o.sesl':
02 !2.8
~~ > e 2 6 7. B 8, 5.2 8, 1 3 8 )
4, -
'W i h D~~CC1U~s o~ loooj Horizontal line denotes the stall area.
11 of26
I NCR #6028873, Rev. 1 Nozzlq.36 Area effected:
min.:
max:
Total:
26,;.146..2 -
120 Beam-Probe.
Limitation Channel Degree Direction, Defects. Location Start End 1
0 normal vol 0
26 146.
Nozzle 36 2
30-U.:
axial. ':
circ-.
338 N4 24 3
60-S
axial.
. circ 158;:
184 304 4
45-LE circ.:
axial 0
.26 1.46 5
.60-SE circ
.axial 22!
48A 168 6
60-SE circ.
axia:.338.
- 4.
124 7
0, 30L. 45LE.
. Leak Path.
combined 26 124 The chart provides information.onwthe chan'nel, beam angle, beam direction, probe location within the head, and'scan'start'/ e'nd points..¢ In adqitionl the leak path 'coverage is provided. The angular p'osition. of the limitation is relative to the downh ll side of. nozzle which equals-b0 deg -The limitation values listed above are in degrees.
",!;¢
' '\\'
A"
- 3
- 3.
- ,i
- $. *- A-*,'
,,4
...
3 3-V
.
V..
Q Nozz3'Covtag
, '
3
. 8 6-
~5 6 -
() 33 2-1-
0 O
'.3 3\\
I.
II
- .., ,,.
I1 sst Am wet r r r"l x
33~~'r-r
_3
'3.
,*,,. i..,
- V 3.
a
-- - -'I 1
'. : ',;.3!..:,.
It 1, -
" , :, r,
.I-,
. - I ttttt
- I
-,1':
77-77t, -i 7~
I 1.
I i,
' I
_3 i
-1 I
0 45 9 0.
2 2 2 7 90
-... -.135'.-
-180 --
225
_270
- 315 360 Degrees 12 of 26
NCR #6028873, Rev. i NazpzlIe36
-5 ~
~ ~ ~ TfAde)4 35[031 0.761
-j, 0.U DACClis J21DeOo Horizontal line denotes the stall area.
13 of 26
NCR #6028873, Rev., 1 Nozzle 37 Area effected:
min.:
max:
Total:
0 125 125
- Beam.
. Probe Limitation Channel
- Degree, Direction Defects Location. Start End
.1.
0 normal.. I vol 0-0
- 1. 125 Nozzle 37
.-2 30-L;..
axial',
circ -
338.-
338:1 103
..3
^
60-S
-axial circ':
158 158 283
'..4 45-LE
,circ'.:
taxial-r.0
- 125, 5
e; 60-SE' circ.
axial';:
22':.'
22
.147 6
60-SE;,4 circ
' ' axial 338 338 103
.______.7 0,,30L, 45LE
'-.Leak Path' ' '
combined 0
103 The chart provides infomtion' on' the'cnannel, beam angle, beam direction, probe-location within the head, and* sicanstart'I end points.! In addition, the leak
.path coverage is provided.. The ahy'ular. position of the liiitati6n is relative to the downhill side.of nozzle which'equals,0'de":.The limitation values listed abbve are in degrees.
t
~~~~~~~~~~tv*
1, t;,-, "'i *I;*..
8,~ ~ ~
~ ~ ~ ~~~~~~~~~~~~,
~~~~~~~~~~~~~~~~t
',-,r:.
v, Nozle3i:o rae
.Y,~
-i. !,-
-~~ ~~~~~~~~~
7 -
i
,44,,-}'j-, ;,' -!'-' ^,
11 '.
4 I
I 4 ---
P z
~
4st-}
- ~
I
~
s
[ts~
se>-I-t 2
~~~t t
- v z o+-l_
_ l.t 3.-
3
. w 2
~
~~~~~~~~~~~~~~~~~~~~~
I
____I.
2 -~~!
d0 _
45 90
135 IN5 '
-225.'
270
-315 360 Degrees 14 of 26
- y A.¢.F.'
NCRk#6028873, Rev. 1 Nozzle 37
.Acsotax~Display IAZ65:14.U3.14 (loz37,RotaUng)- 1'7TIF1 F7ir 4.
lM
__1A_
DITd)
__5_001 3_
01 Horizontal line denotes the stall area.
15 of 26
- 6028873, Rev. I~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NCR o6028873, Rev. 1 I.
'I...
Nozzlel 42 Area effected:
min.:
max:
Total:
. ~~~158 227.
69 Beam
'i 22.
Prob Limitation Channel Degree Direction Defects Location. Start End 1
0 normal.
vol 0
158 227 Nozzle 42 2
30-L-axial-;'-
circ 338
-136 205'.
3 60-S axial,.).
circ t 158 316 25 4
45-LE circ axial 0
158 227
.5 60-SE.
circ.
axial 22 180 249 6
.60-SE
.circ axial f.338 136 205 7
0,; 30L, 45LE Leak Path'.":,I. combined 158 205 The chart provides information'.on the cha'rine'l, beami angle, beam 'directionr, probe location within the head, and scan start I end points: In'additiorii; the leak path coverage is.provided. 'The angular positio'n.ofrthe limitation is relative to the downhill side of nozzle which equals 0 deg The limitation lvalues listed'above are in degrees.,"
- f.
'. i e4"Cj r 'a' t
~~~~NozzWile 'Zeae-
.r ',* - -' l 0;
45
- 90.
15 18 2,.20 ;..
3
- 15 360.
Degrees-------~.
4, 16 of 26
NCR #6028873, Rev. 1 Nozzle 42
~~~~1.
581
,F_
cuoe'ipa
_A25 2.853'(t1oz~4ZRotaUng)J
.w-.
tly~Il
==
-~~~~~~18
-27 0.471 3601 ID.42w
.6
.2Depth(in)
S -
~~~t~ Clip
. h.............
s1 t oj*-, -. ;:
Horizontal line denotes the stall area.
17 of 26'
NCR #6028873, Rev. 1 NozzleA44
- a 1-Area effected:
min.:
max:
Total:
95 184 89 Beam Probe Limitation Channel Degree.
Direction. Defects Location Start End 1
0'.0 normal
'vol 0
95 184 Nozzle44
. 2 30-LU,.-
,axial"i circ:
338 73 -'162
_ 3 60-SiL :,
- iaxial
. circ-'
158 253 342 54 45-LE circ
'axial 0
95 1 841 5
.60-SE circ axial.
22 117 95 206 6
.: 60-SE.
circ'.
axial 338 73
.162 7
0, 30L, 45LE,,
4Leak Path' ; -
combined I95 162
~~~~~*
- 9.,,
.~
i' fi'.
The chart provides information on the 'chah'nel,' beam -angle, beam direction, probe location within the head, 'and,scan start I end points. In addition, the leak path coverage is provided.' The angular position of the'li'miitat50n is relative to the downhill side 'of nozzle which' eqalsi(Oideg. The limitation values listed above arein degrees.
i k~~Nozzi 644 ::overage' -
4 ;
8 -
4 I~~~~~~~~~~
1
-K-l; -1JEPr
- 5_-
55
.',p
'."r-w*r_-15rs 4
U 3 3.. ~~~~~~~~~~~~~~~~~~~~~.
7, 9..l.
0 45 90 135-180-225-:..
270 315
.360 Degrees 18 of 26
NCR #60287"~Rev. I ZJozz~e'44
~'~'Accusonex Displa,IA22652U137.31V(NIz~4,oa~i')
Chan~~~~~e1~0 uti.Z Pi'Tl uro ke I~~~~---~~~~9 LIM~ ~~'ii(~
-sl~~~~f~de) 0.321' "
0.761
~~~~~-2,4 IJ9 I M n u f I*
Horizontal line denotes the stall area.
19 of 26"
NCR #6028873, Rev. 1 NozzlepAr§5
-- Area effected:
min.:
max:
Total:
71-
.150 79 Beam Probe Limitation Channel Degree Direction Defects,. Location Start End-1 0 °normal vol..
0 71 1 150-.
Nozzle 45
-2 30-Ly axial
- -circi.
338.
49 128 3
60-S t-axial.
.'circ.-. '
158 1229 308 4
45-LE circ;. : axial,
- 0.
71 150 5
'60-SE.:t circ"3': axial
,..22 93 172 6
60-SE:..
circ.:.
axial :
338 J 49 128 7
0,30L, 45LE Leak,Path
. combined ;: 71 -
128
' i;;
- ' it,
,'i.
I'>; '
The chart provides information,'on',the channe1,' bea'm 'angle, beam direction, probe location within the head, 'a'd scan start, lend points. Iln addition, the: leak path coverage is provided., The'angular positionof the limitation is relative.to the downhill, side' of. nozzle whichitequals,O deg.' The limitation.values listed above are in degrees:
Nozzle 45,Coveir1ge 1Z 5~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~1 Q
3 -
2 1
f _
t _t 1--t 1
I
-¢ t
- t E
z 0 o.
45.
90
- 135,:.',',.i.80 225.
270 315 360 Degrees 20 of 26
NCR#6028873, Rev. 1
- Nozzle 45
- 1..
F='
Accus n I
D
,p;.4A3 71
'2-I U.5I f
71~~~~~~~~~~~~~.7
_______ ~
~
~
~
-:HEA.
0.751 DAC C1Os.2 ioool
.I
._~~~~~~~~~~~~~~~~~~~~~~~
Horizontal line denotes the stall area.
21 of 26
NCR #6028873, Rev..1 Nozzle.46 S ','
Area effected:
min.:
max:
- 68.
144 Beam_.
Channel
- Degree, Direction. Defects Total:
76 Probe Location
. Limitation Start End Nozzle 41 1 l __0 normal vol 0
68
- 144
- 2.
30-L:_b axial circ 338 46-122.
3 60-S:.
axial; circ
'!-;158 226.
302 I 4 45-LE.
circ axial:
O
.68 144 5
. 60-SE' circ; axial ! :
22 90 166 6 - SE.
icirc
- axial.
.338 46 122
.60S
.. _J
.c rc.
.1.__
, -A t.
i,
I ;
I
,
I.
7 0, 30L, 45LE I:
. Leak Path -
combined 68 122 The chart "provides informatior 1 don the. channel, beam. angle, beam':direction, probe l'cation within' the head, and ?scanrstart 'end: points.!;,in addition, the leak path coverage is provided. The; angular position of the limitation is relative to the downhill side of nozzle whichequals 0 deg.-;The limitation values'listed ab'ove are in degrees.
J
- '-r
.~~~
~~~~~~*:.
,, J,,
l' 5:
i '
C6 C
'U to 6
A.A.
4-iI 0
45
.t,.
1,
_... I t :. :' :.". 11
- . r'.,
, I
.i,,
- '
I-F A g
..je...z J
j'iI.*
I.,..>
II
,
I
- . ~~~~~~~~~~~~~~~~~
r4OZ ie'.. ~ L urge.
I 1
..* IV.~:.
j 4
.4 I
I
^.
I.
W.
. :1 ^
, -*, h r,; -T 4
.I.
- -90
.135 180-
. 225 270 Degrees 315 360 2....
2 6 22 of 26
.-.e e 4#
t NCR 6028873, Rev. 1 N zz e 46 I"
-;-, 'O* W'a.
4.a~ ~ ~
~
~ ~~~~Z8
-5.0012.)
3G5.001 0.521 0.781 MA7.I,17 65 BA8)
D~t~n sit Horizontal line denotes the stall area.
23 of 26
NCR #60288730 Rev. 1 Nozzle 47 I.
Area effected:
min.:
max:
Total:
55
- 161 106
- Beam, Probe.'
Limitation Channel Degree.
Direction Defects Location Start' End
.. 1.,
0, normal.
vol-.
. 0.
55 161 Nozzle 47 2
30-L2 axial.
- circ, 338-33 -139 3
. 60-S
'axial circ 158 213
- 319 4
45-LE circ axial-.
.0 i.
55
.161
.,.5
';.60-SE circ-axial
' 22 77-183 6
60-SEn
-.. circ:
axial,.
- 338,
'33 139 7
0, 30L, 45LE '-'
Leak Path.
combined 55 139 The chart provides information o'n the;;channe'l, beam angle, beam direction, probe location within the head, and scan.start I end points. In addition, the'leak path coverage is provided '.,Th1eangular position' of the limitation is relative to the downhill'side of nozzle which equals '0 deg.; The liritation values listed above are in degrees. '
'i i
l
'ia
'v i'b-w)
- tt j;
'.' !t I'[.
!,@1
'8 2 tsS tlaX'~e f#@'w
^
1'f' s
8 f
w s
1
- l s~~~o
-1 s
OfF t
p as}Si'w
- s....
r --
1-iNozzle 7ov~erago~-'-
i j !
/
I
.v-.-.,7 7
7.1.
.r.
v.
j, t:
v ^. -
I
-... :,,c :,
I 1'
'2.,
i-i e
r s
0-
-_45
- C 3-I,,
10 270 31 90... 15_:.
180:
225. -:
-... 270
-' -~.
315 360 Degrees 24 of 26
NCRI#6028873, Rev: 1 Nozzle 47 7:-%!:7 7Arccuson'e'x'Dlsplay IA2Z65 ;1 607.34 (Noz '47,RotaUng)
I. I.
.IFEr tWi
~i. !
- :.-PeAV r
,.X i1itie l
111 l
S I
,11111 11 E
1
'-l 101 SDirif~rhl lhI igl I
I I
i; 0
lI I Illb milill
!I Iii fli:-a:
U 610~~0
'r TEAde9; i
3I 0.!21 1
0.761 N
N
~~~~~~~~~~~Depth"(1n l- -e#°t 4+';prrl 1521 fb4,J,1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-I =.
-- 11 Horizontal line denotes the stall area.
25 of 26
I NCR #6028873, Rev. 1 Bottom Up Rotating Transducer Head Configuration I
i.
.I.,
- 2. 55-U I -
I.
6;-
45-LE l) -
, t.,.
2.L0
, 1 311 V
I 0--i I "' ';
-4-LE
'
A
- *
49.1 (15)
I-.,
C'.'S*
- t
,,'j.
.'I I
.*
I~ I I.
0\\
,s :;,'. I 3 :
(16,11) 89,. ::
5.
, ^ i f Dt.", '::'It_ ;-
- -, '. 3 ' j C. I.,
i
.1,','-, -) ':.'I ;, 'i , -.,,',^ t; j I I
' 's 1
iwV ORENITAT10ll i
- * ~
'I!
S.
< A ~
- , ' l ;, r ;1 tei'
.r..-; *
- 't I
t
\\
,.; 71:......
' !'f1.;:4.;.'i} L Xt,.,- - X 1................................... R ;.
- 1...... ^; ' w. !t..' ' l- ¢ *s 2.................................
t - '-
- 26 of 26