ML20234C247
| ML20234C247 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 09/16/1987 |
| From: | Andognini G SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| GCA-87-536, IEB-87-001, IEB-87-1, NUDOCS 8709210215 | |
| Download: ML20234C247 (16) | |
Text
--
t n
ig)SMUD 1
SACRAMENTO MUNICIPAL UTILITY DISTRICT C P. C,. Box 15830, Sacramento CA 95852-1830,(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA GCA 87-536
)
SEP 161987 l
U. S. Nuclear Regulatory Commission
{
Attn:
J. B. Martin, Regional Administrator
.l Reg',on V 1
Off' ice of Inspection and Enforcement i
1450 Maria Lane, Suite 210 j
Halaut Creek, CA. 94596 J
1 DOCKET NO. 50-312 RAFCHO SECO NUCLEAR GENERATING STATION LICENSE NO. DPR-54 REiUEST FOR INFORMATION (IE BULLETIN NO. 87-01) 1
Dear Mr. Martin:
i Pursuant to the provisions of Section 182a of the Atomic Energy Act of 1954, the District hereby submits the information requested in IE Bulletin No. 87-01.
The Enclosure provides information on the District's program to monitor pipe wall thinning in high energy single-phase and two-phase carbon steel piping systems at the Rancho Seco Nuclear Generating Station.
If you should have questions regarding this response, please contact Mr. Ron Colombo at (916) 452-3211, extension 4236.
Sincerely, AfQX W.
i
~
G/ Carl Andognini Chief Executive Officer, 1
Nuclear Sworn to and subscribed before me this /6 day of September,1987.
/Qudw f.
Ib,xP i
U
- otary Public
]
33-
$L - -) -} - -
cc:
G. Kalman, NRC, Bethesda (w/atch)
A. D'Angelo, NRC, Rancho Seco (
) -
j F. J. Miraglia, NRR, Bethesda (w/atch) rEl/
8709210215 870916 PDR ADOCK 05000312
( 'l P
PDR RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald, CA 95638-9799: (209) 333 2935 q
]
ENCLOSURE Rancho Seco has established an inspection program to monitor secondary system piping for wall thinning.
This program is governed by a Mechanical Engineering Guideline (MEG.601).
INFORMATION RE00ESTED 1.
Identify the codes or standards to which the piping was designed and fabricated.
DISTRICT RESPONSE 1.
The codes to which the piping was designed and fabricated are as follows:
ANSI 31.1 ANSI 31.7 class II and 11I INFORMATION RE00ESTED 2.
Describe the scope and extent of your programs for ensuring that pipe wall thicknesses are not reduced below the minimum allowable thickness.
Include in the description the criteria that you have established for:
a.
selecting points at which to make thickness measurements b.
determining how frequently to make thickness measurements c.
selecting the methods used to make thickness measurements d.
making replacement / repair decisions DISTRICT RESPONSE 2.
A mechanical engineering guideline, in place to establish an inspection program to monitor pipe wall thickness for two phase applications, was revised to monitor single phase service.
The following describes Rancho Seco's wall thickness monitoring program f
criteria:
a.
Inspection points are selected under the following criteria:
System handles water or steam System piping is carbon steel (worst case-low alloy)
System temperature is greater than 195'F (worst case 265-320*F)
System has low oxygen content (worst case < 5 ppb)
System velocity greater than 5 feet per second System configuration produces flow disturbance (listed by severity, most severe to least severe)
- Control valve, tee (splitting), 180 deg bend
- Check valve, globe valve, tee, flow orifices, components separated by between 3 and 10 pipe diameters
- 90* bend, elbow, reducing elbow
- Butterfly valve, instrument tap, reducer
- Gate valve, welds in straight pipe j
l '
1
+
b.
The inspection program requires thickness measurements every
. refueling outage based on the criteria of paragraph 20.
t.-
- c.. Thickness mea urements'are made_using an' ultrasonic "B Scan" thickness measurement system manufactured by Rutherford, in which;a 100 percent inspection is performed at each inspection point.
"A" scan method utilizing a grid is available as an option.
d.
The replacement / repair.. decision is based on the mechanical
= engineering guideline's acceptance criteria which states the following:
"If th9 measured thickness-is less than the minimum required thickness, pipe will be replaced immediately."
An inspection index (I) is also calculated to categorize.each inspection point for future inspections and to determine whether an inspection point requires further evaluation.
The inspection index formula is:
Remainina Hall Thickness Available I"
Safety Factor
- Next Cycle's Erosion If I < 1 - further evaluation will be performed to determine if piping'will' be replaced.or if it will be serviceable another cycle.
Piping will also be inspected at first available opportunity.
If 1 < I I 2 - inspect at next scheduled outage.
This becomes a category 1 inspection point.
If 2 < I 13 - inspect during a future scheduled' outage as appropriate. This becomes a category 2 inspection point.
If I > 3 - spot check at future scheduled outages as appropriate. This becomes a category 3 inspection point.
INFORMATION RE00ESTED 3.
For liquid-phase systems, state specifically whether the following factors have been considered in establishing your criteria for selecting points at which to monitor piping thickness (Item 2a):
a, piping material (e.g., chromium content) b.
piping configuration (e.g., fittings less than 10 pipe diameters apart) c.
pH of water in the system (e.g., pH less than 10) i d.
system temperature (e.g., between 190 and 500*F) e.
fluid bulk velocity (e.g, greater than 10 ft/s) u f.
oxygen content in the system (e.g., oxygen content less than 50 ppb)
DISIRICT RESPONSE 3.
See Section 2A. !
i
. INFORMAT10!LREQUESIED 4.
Chronologically list and summarize the results of all inspections that have been performed, which were specifically conducted for the purpose of identifying pipe wall thinning, whether or not pipe wall thinning was discovered, and any other inspections where pipe wall thinning was discovered even though that was not the purpose of that inspection.
a.
Briefly described the inspection program and indicate whether it was specifically intended to measure wall thickness or whether wall thickness measurements were an incidental determination.
b.
Describe what piping was examined and how (e.g., described the inspection instrument (s), test method, reference thickness, locations examined, means for locating measurement point (s) in subsequent l-inspections).
l c.
Raport thickness measurement results and note those that were identified as unacceptable and why.
d.
Describe actions already taken or planned for piping that has been found to have a nonconforming wall thickness.
If you have performed a failure analysis, include the results of that analysis.
Indicate whether the actions involve repair or replacement, including any change of materials.
DISTRICT RESPONSE a.
As mentioned above Rancho Seco's inspection program was specifically established for the sole purpose of monitoring pipe wall thickness.
Attac bent 1 shows a list of all inspections points, b.
Piping was examined on the Main Feedwater and Condensate System.
There were a total of 48 inspection points which included 5 reducers, 10 straight pipe sections, 16 tees, and 17 elbows.
The diameter of these inspection points ranged from 6 to 42 inches.
The inspection instrument is a Rutherford THI-150 ultrasonic B.
The plant approved test method was conducted by U.S. Testing Co. using an ultrasonic examination procedure for B scan thickness measurement (Uc?-UT-5).
Reference thickness is based upon manufacturers nominal thickness. A conservative inspection is achieved using a safety factor of 2 in the inspection index formula.
Subsequent inspection is based on the inspection index calculation mentioned in section 2d. Categorization of inspection points is taken into consideration when selecting potential problem areas.
l _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
---w_u,m--
f.<
)
?~'
'c.
Reported thickness _ measurement results are listed on Attachment 2.
l
{
'The following isua summary of the 1987 inspection:
I
- 6 Following HEG.601 methodology, 45 points were inspected initially.
These points are located throughout the Main Feedwater and Condensate systems.
The results of'the inspection revealed 3 points having a' thickness less than the minimum allowable
'q
' thickness. Two of the points are adjacent downstream of the "B" MFPs miniflow valves.
The third point is located on the "A" loop with a configuration identical to one.of the points on-the "B"
loop.
Nonconformance Reports were written against these points.
Piping will be replaced immediately.
These points had previous erosion / corrosion problems due to two phase conditions.
A fourth Nonconformance report was written against a point located adjacent to an isolation valve on the "A" MFH loop.
This point had a thickness above minimum allowable. However, it had an i
inspection index less than 1.
Nuclear Engineering Department evaluated the configuration and determined that the piping is acceptable for at least another cycle. An additional inspection was performed adjacent to this fourth point to assure that no degraded sections were overlooked. Additional inspections were also performed on points that had similar geometric configurations as some of category 1 locations. Acceptable results were found on the latter examinations, d.
Nonconformance reports were written on all three piping sections that were found to have a wall thickness less than the minimum thickness allowed.
Piping will be replaced immediately.
The nuclear engineering group is evaluating the replacement of piping with a heavier material, since this line had previous erosion / corrosion problems due to two phase condition, e.
Previous ult nsonic examinations were performed in 1983 and 1985 on two phase pipe lines in the feedwater, high pressure and low pressure l
turbine systems. Approximately 40 points were inspected in 1983.
This included 14 straight line sections, 19 elbows, 2 tees, and 15 reducers. Most of these points are located on the second point I
heaters extraction pipe lines. A reducer was replaced due to low thickness reading. This reducer is located on an 8 inch line between the "A" reheater main steam coil drain tank and the "A" first point heater, downstream of a level control valve.
In 1985 approximately 27 points were examined.
This included 1 sweep, 1 straight line section, 6 elbows, 13 tees, 4 reducers, 1 cap, and 1 cross section.
No components were replaced as a result of this inspection.
1 J l
l
w.
INFORMATION REQUESTED 7
5.
Describe any plans either for revising-the present or for developing new or. additional programs for monitoring pipe wall thickness.
DISTRICT RESPONSE 5.
The present wall thickness program has been revised to encompass
' monitoring both single-phase and two-phase carbon steel piping.
This program provides the appropriate methodology.for a comprehensive wall thickness monitoring program.
Sacramento Municipal Utility District will continue its involvement in the industry's search for the prevention of the erosion-corrosion phenomenon.and will continue the detection phase to' prevent any catastrophic failures. The EPRI "CHEC" computer program will-be evaluated for potential use in ranking single phase-piping system components in order of their susceptibility to erosion / corrosion attacks.
i i
l l
I 1
! i
O.
1 1
L.
1 Attachments
- 1) Locations where piping was examined by line designation i
- 2) Pipe wall thickness monitoring results
- 3) References
\\
i l
l
- p 4
~ ATTACHMENTS 1 m
a DATE:08/14/67 b'#
.PAGE:
l' ISI' WALL THINNING INSPECTION STATUS ~ REPORT.
7 SN SD.IR.BN BD ID IP II SR
OU-TP FD FE,UO SD SE PE PS UA FO L
FE F-LV HE H
uTE-OD. O. AE.-I D I '
LINE m
TEE N.
. NUMBER' LEVEL ~
L L
TD N N.
T' T
TE LD R-G D
D.
G G
- ======================================================================:-
01i2
-RED 31220-12.GB MEZZ TURB N
Y-Y
.Y.YL.Y Y
LOCATION: '2ndjpoint htr drn pump P312A to MFP.P317A suction 01'.3
. RED 31220-12GB MEZZ TURE N.
Y YYY Y
Y q
k 1
LOCATION: 2ndLpoint htr'drn pump P312A to MFP P317A suction-01.4 L
31220-12GB MEZZ TURB N-Y Y
Y Y
Y Y
LOCATION: 2nd. point htr drn' pump P312A to MFP P317A 01.4W' NA 31220-12GB MEZZ TURB-N Y
Y Y-Y Y
Y1'-
LOCATION::2nd. point htr drn pump-P312A to MFP P317A 1
02.5 T
31721-20DB >
+15 GDE TURB Y 1(
Y Y
Y Y
Y Y
Y 31725-6DB
\\
LOCATION: MFP P317B to 2nd point heater E-322B.
'02.7 L-31721-20DB
+17 MEZ TURB Y
Y' Y Y
Y Y
Y
'Y Y
LOCATION: MFP P317B to 2nd point heater'E-322B 03.2 L-32120-20DB
+2 TANK FARM N
Y Y
Y Y
Y Y
LOCATION: 1st point heater E-321A to Steam Generator E-205A 05.1 T
32134-20DB >
+37 TANK FRM Y
Y Y
Y Y
Y Y
Y Y
32128-8DB
' LOCATION: 1st point heater E-321A to Steam Generator E-205B 136.1 L
32125-8DB
+21 TANK FRM N
Y Y
Y Y
Y Y
LOCATION: 1st point heater E-321A Main Stop Bypass to A OTSG 07.2 T-32133-30DB >
+36 MEZ TURB Y
Y Y
Y Y
Y Y
Y Y
32133-30DB y
LOCATION: 1st point heater E-321A to A OTSG l
i 07.3 L
32133-20DB
+21 TANK FRM Y
Y Y
Y Y
Y Y
Y Y
t LOCATION: 1st point heater E-321A to A OTSG l
(
07.4 L
32133-20DB
+21 TANK FRM N
Y Y
Y Y
Y Y
Y LOCATION: 1st point heater E-321A to A OTSG m__
(-
4..
-ATTACHMENT 1 (CONT.)
E.:
^
tDATE:08/14/87.
't,
.PAGE:
2-
- ' ih
~ISI WALL THINNING ~ INSPECTION STATUS' REPORT SN SD IR BN BD ID IP II SR FT!
.PN IY,
- IM
.TE:
FE F LV HE H E
EE LL FV~
'NB I
LINE-OD' O AE ID I C
CD ALcOE TE:
.Ns
' NUMBER
- LEVEL, L
L TD N N
T.
T TE LD
~'
- R-
~G D
D G
G
-D D.-
- ::::::::::::::::::::::========::::::::::::::=============
08.1 T-32134-30DB >
434 MEZ TURB
.Y Y
Y Y
Y Y lY Y ; Y.
32133-20DB LOCATION: lat-point heater E-321B to B OTSG 09.1 T
~32134-20DB >
+24 TANK.FRM. Y Y
Y Y
Y-Y Y
Y.
Y 32126-8DB LOCATION: -1st pointEheater.E-321B to B OTSG 10.1
.L 32140-20DB1
+2 TANK FRM N
Y Y
Y Y
Y Y
Y-LOCATION: 1st point heater'E-321A to A OTSG
^10.1W NA-32140-20DB1-
+2 TANK FRM-N
.Y ' Y
_Y Y.N Y
i 1st point heater E-321A.to A OTSG LOCATION:
Y Y
Y Y
Y-Y 10.4
.T 32140-20DB1>
+3 Rx-BLDG N'
32140-14DB1-
\\
LOCATION: 1st point heater E-321A toLA OTSG
- 10. '4 L - L 32140-20DB1
+3 Rx BLDG N
N Y-Y Y
Y Y
LOCATION: 1st point heater E-321A to A-0TSG 11.1 L
32141-20DB
+24 TANK FRM N
Y Y
N Y
Y Y
. LOCATION: 1st point heater.E-321B to B OTSG 12.1L L
32141-20DB1
+3 Rx BLDG N
N Y
N Y
Y Y
i'i LOCATION: 1st point heater E-321B to B OTSG 12.1T.T 32141-20DB1
+3 Rx BLDG H
N Y
N Y
Y Y
I 1
l LOCATION: 1st point heater E-321B to B OTSG 13.1 L
32322-24GB GRADE TURB N
Y Y
Y Y
Y Y
LOCATION: 3rd point heater E-323A to MFP P317A (condensate) 13.2 L
32322-24GB
+19 GDE TURB Y
Y Y
Y Y
Y Y
Y Y
LOCATION: 3rd point heater E-323A to MFP P317A (condensate) 13.3' T-32322-24GB >
+34 MEZ TURB Y
Y Y
Y Y
Y Y
Y Y
31220-16GB
. LOCATION: 3rd point heater E-323A to MFP P317A (condensate)
--_____._._.__-_-_-___.__._b
1 ATTACHMENT 1 (CONT.)
1 DATE:08/14/87 l
l PAGE: 3
~
ISI WALL THINNING INSPECTION STATUS REPORT I
i SN SD Ih BN BD ID IP 11 SR FT CE CO NE hm RO NO NA NS CE-PN IY AE AN SM UE JN SN SS ST AM OU TP FD FE UO SD SE ?E PS UA FO IM TE FE F LV HE H E
LINE OD 0 AE ID I C
NUMBER LEVEL L
L TD N N
T T
TE LD R
G.
D D
G G
= ::::::::::::::::::::::::::::::::::::::::::::::::::=========
13.4 T
32322-24GB >
+34 MEZ TURB Y
Y Y
Y Y
Y Y
Y Y
31222-12GB LOCATION: 3rd point heater E-323A to MFP P317A (condensate) 13.5 T
32322-24GB >
+34 MEZ TURB Y
Y Y
Y Y
Y Y
Y Y
32324-6GB LOCATION: 3rd point heater E-323A to MFP P317A (condensate) 14.2 T
32323-24GB >
+33 MEZ TURB Y
Y Y
Y Y
Y Y
Y Y
34323-16GB LOCATION: 3rd point heater E-323B to MFP P317B (condensate) l 14.3 T
32323-24GB >
+33 MEZ TURB Y
Y Y
Y Y
Y Y
Y Y
32325-6GB LOCATION: 3rd point heater E-323B to MFP P317B (condensate) i 14.4 T
32323-24GB >
+33 MEZ TURB Y
Y Y
Y N
Y Y
Y Y
31221-12GB
\\
LOCATION: 3rd point heater E-323B to MFP P317B (condensate) 14.5 L
32323-20GB
+20 MEZ TURB N
Y Y
Y Y
Y Y
LOCATION: 3rd point heater E-323B to MFP P317B (condensate) 18.1 L-34323-16GB
+15 MEZ TURB Y
Y Y
Y Y
Y Y
Y Y
LOCATION: Gland Stm Cond E-343 & Air Ejector E-342to B MFP 18.3 T
34323-16GB >
+15 GDE TURB Y
Y Y
Y Y
Y Y
Y Y
34325-16GB LOCATION: Gland Stm Cond E-343 & Air Ejector E-342to B MFP 19.1 T
35100-42HC >
-12 TURB BLD N
Y Y
Y Y
Y Y
35020-30HC LOCATION: HP Cond E-350B/LP Cond E-350A to Condensate pumps 19.2 T
35103-42HC >
-12 TURB BLD N
Y Y
Y Y
Y Y
35100-36HC LOCATION: HP Cond E-350B/LP Cond E-350A to Condensate pumps 24.1 L
31725-6DB
+12 TURB BLD N
Y Y
Y Y
Y Y
Y LOCATION: MFP P317B to LP Cond E-350A 24.2A NA 31725-6DB
+12 TURB BLD N
Y Y
Y Y
Y Y
LOCATION: MFP P317B to LP Cond E-350A u___-______________
n.
3
'^
SU~.. '
ATTACHMENT 1:(CONT.)
1.
Oj
- ' - o'"...
DATE:08/14/87 PAGE: 4 l
11SILWALL THINNING INSPECTION STATUS' REPORT H
SN.SD IR BN BD.ID IP-II SR' 17P '
IL PN, lIY' AE AN SM UE UN SN.SS ST'AM' OU'
/TP-FD FE UO SD SE PE PS UA FO 4
IM-TEr FE F LV HE H.
'I-LINE
.a TE.
N NUMBER LEVEL L
L TD N N
T T
TE LD
?R
.G' D
D-G' G
D D' 24.2B, RED 31725-6DB~
+12 TURB BLD N
Y Y
Y Y
Y Y
LO' CATION:'MFP P317B to LP Cond E-350A 24.2C NA 31725-6DB
+12 TURB BLD N
Y.
Y Y
Y N
Y LOCATION: MFP P317B to LP Cond E-350A Y
Y Y
Y Y
Y 24.2D NA-31725-6DB
+12 TURB BLD N
LOCATION:.MFP P317B to LP Cond E-350A 9
.4.2E NA~ 31725-6DB
+12 TURB BLD N
Y Y
Y Y
N Y
2 LOCATION: MFP:P317B to LP Cond E-350A 25.1 FED 31724-6DB
+12 TURB BLD N
Y Y-Y Y
Y Y
\\
LOCATION: MFP P317A to LP Cond E-350A 25.2A NA 31724-6DB
+12 TURB BLD N
Y Y
.Y Y
N Y
J LOCATION: MFP P317A to LP Cond E-350A Y
Y Y
Y Y
Y 25.2B NA 31724-6DB
+12 TURB BLD N
LOCATION: 'MFP P317A to LP Cond E-350A 25.2C NA-31724-6DB
+12 TURB BLD N
Y Y
Y Y
Y Y
i l
LOCATION: MFP P317A to LP Cond E-350A
~
25.2D NA 31724-6DB
+12 TURB BLD N
Y Y
Y Y
Y Y
LOCATION: MFP P317A to LP Cond E-350A l
25.3
' RED 31724-6DB
+12 TURB BLD N
Y Y
Y Y
Y Y
LOCATION: MFP P317A to LP Cond E-350A 30.1 L
34620-16HC TURB GRADE Y
Y Y
Y Y
Y Y
Y Y
LOCATION: 6th pt Htr Drn Clr to 6th pt Heater 31.1 L
31720-20DB
+13 GDE TURB Y
Y Y
Y N
Y Y
Y Y
LOCATION: MFP P317A discharge to A OTSG
ATTACHMENT 2 PIPE WALL THICKNESS MONITORING RESULTS MEG.601 DATE:08/14/87 PAGE: 1 POINT NOMINAL MINIMUM MEASURED NUMBER THICKNESS THICKNESS THICKNESS WEAR PERCENT (Tn)
(Tm)
(Ta)
(Ta-Tm)
(Tn-Ta) INDEX*
RATE
- THICK
===============================================================
01.2 0.375 0.251 0.59 0.339
-0.215
-4.1
-427, 157.3 01.3 0.375 0.251 0.357 0.106 0.018 15,4 35.79 95.2 01.4 0.375 0.251 0.408 0.157
-0.033
-12.
-65.6
'08.8 01.4W 0.375 0.251 0.391 0.14
-0.016
-23.
-31.8 104.3 02.5 0.432 0.3185 0.384 0.0655 0.048 3.58 95.43 88.89 02.5 1.281 0.9615 1.2 0.2385 0.081 7.71 161.
93.68 02.7 1.281 0.9615 1.155 0.1935 0.126 4.02 250.5 90.16 02.7 1.281 0.9615 1.225 0.2635 0.056 12.3 111.3 95.63 03.2 1.281 0.9615 1.296 0.3345
-0.015
-58.
-29.8 101.2 05.1 0.5 0.4147 0.475 0.0603 0.025 6.32 49.7 95.
05.1 1.281 0.9615 1.187 0.2255 0.094 6.29 186.9 92.66 06.1 0.5 0.4147 0.482 0.0673 0.018 9.8 35.79 96.4
\\
07.2 1.443 1.4423 1.575 0.1327
-0.132
-2.6
-262.
109.1 07.3 1.281 0.9615 1.242 0.2805 0.039 18.8 77.53 96.96 07.4 1.281 0.9615 1.225 0.2635 0.056 12.3 111.3 95.63 08.1 1.281 0.9615 1.256 0.2945 0.025 30.9 49.7 98.05 08.1 1.443 1.4423 1.543 0.1007
-0.1
-2.6
-199.
106.9 09.1 0.5 0.4147 0.453 0.'0383 0.047 2.14 93.44 90.6 l
09.1 1.281 0.9615 1.15 0.1885 0.131 3.77 260.4 89.77 10.1 1.031 0.8376 1.252 0.4144
-0.221
-4.9
-439.
121.4 10.1W 1.031 0.8376 0.887 0.0494 0.144 0.9 286.3 86.03 10.4L 1.031 0.8376 1.
0.1624 0.031 13.7 61.63 96.99 10.4T 1.031 0.8376 1.479 0.6414
-0.448
-3.8
-891.
143.5 11.1 1.031 0.8376 0.962 0.1244 0.069 4.72 137.2 93.31 12.1L 1.031 0.8376 1.006 0.1684 0.025 17.6 49.7 97.58
ATTACHMENT 2 (CONT.)
PIPE' WALL' THICKNESS MONITORING RESULTS
. g MEG.601 DATE:08/14/87 4.
PAGE: 2 LFOINT.
NOMINAL. MINIMUM ' MEASURED NUMBER THICKNESS: THICKNESS THICKNESS.
' WEAR PERCENT!
(Tn)
(Tm)
(Ta)
(Ta-Tm)
(Tn-Ta) INDEX*
RATE
- THICK-
)
i
===========================================================================-
12.1T 1.031
-0.8376 1.487 0.6494
-0.456
-3.7
-907..
144.2 13'.1 0.375 0.315' O.352 0.037 0.023 4.21 45.73 93.87 13.2.
0.562-0.4724 0.665 0.1926
-0.103
-4.9
-205.
118.3 13.3 0.375 0.315 0.371 0.056 0.004 36.7 7.952 98.93 13.3 0.562 0.4724 0.516 0.0436 0.046 2.48 91.45 91.81 13.4 0.375 0.251 0.336 0.085 0.039 5.71 77.53 89.6 13.4~
0.562 0.4724 0.509 0.0366 0.053 1.81 105.4 90.57
.13.' S 0.28 0'.1304 0.242-0.1116 0.038 7.69 75.55 86.43 13.5 0.5
'O.3937 0.49 0.0963
'O.01 25.2 19.88 98.
i 14.2 0.375 0.315 0.332 0.017 0.043 1.04 85.49 88.53 1
14.2 0.562 0.4724 0.523 0.0506 0.039 3.4 77.53 93.06 i
~14.3 0.28 0.1304 0.261 0.1306 0.019 18.
37.77 93.21
\\
14.3 0.562 0.4724 0.55 0.0776 0.012 16.9 23.86 97.86 14.4 0.375 0.251 0.339 0.088 0.036 6.4 71.57 90.4' 14.4 0.562
'O.4724 0.508 0.0356 0.054 1.73 107.4 90.39 14.5 0.5 0.3937 0.473 0.0793 0.027 7.7 53.68 94.6 18.1 0.375 0,315 0.355 0.04 0.02 5.24 39.76 94.67 18.3-0.375 0.315 0.451 0.136
-0.076
-4.7
-151.
120.3 I
18.3
'O.375 0.315 0.345 0.03 0.03 2.62 59.64 92.
19.1 0.375 0.2871 0.391 0.1039
-0.016
-17.
-31.8 104.3 19.1 0,5625 0.3687 0.525 0.1563 0.0375 10.9 74.55 93.33 l
19.2 0.5625 0.3687 0.525 0.1563 0.0375 10.9 74.55 93.33 24.1 0.432 0.3185 0.394 0.0755 0.038 5.21 75.55 91.2 24.2A 0.466 0.3667 0.49 0.1233
-0.024
-13.
-47.7 105.2 24.2B 0.5415 0.4147 0.471 0.0563 0.0705 2.09 140.2 86.98
l
. ATTACHMENT 2 (CONT.)
l 4
4
.a f.
. PIPE WALL THICKNESS MONITORING;RESULTS a
MEG.601
.DATE:08/14/87
]
PAGE: 3 POINT-NOMINAL-MINIMUM MEASURED
.i
- NUMBER THICKNESS THICKNESS THICKNESS WEAR PERCENTi (Tn)
'(Tm)
(Ta)
(Ta-Tm)
(Tn-Ta) INDEX*
RATE
- THICK-1
===============================================================
24.2C:
0.5 0.4147; 0.413
-0.0017-0.087 E-2.
173.
82.6 24.2D
- 0. 5-0.4147 0.526 0.1113
-0.026
-11.
-51.7 105.2 124. 2E' O.432 0.3185 0.211
-0.1075 0;221
-1.3.
439.4 48.84 25.1 0.432 0.3185 0.471 0.1525
-0.039
-10.
-77.5
-109.
l 25.2A-0.432 0.3185 0.225
-0.0935 0.207
-1.2 411.5 52.08 25.2B 0.4667 0.3667 0.43 0.0633 0.0367 4.52 72.96 92.14 25.2C 0.5 0.4147-0.49 0.0753 0.01 19.7 19.88 98.
'25.2D
'O.5 0.4147 0.471 0.0563 0.029 5.09 57.65 94.2 25.3 0.432 0.3185 0.431 0.1125 0.001 295.
1.988 99.77-i 30.1 0.375 0.143 0.355 0.212 0.02 27.8 39.76 94.67 i
31.1 1.281 0.9615 1.32 0.3585
-0.039
-24.
-77.5 103.
L COMMENTS:
\\
INDEX RATE =(H*(Ta-Tm))/((Oc*K)*(Tn-Ta))
WEAR ~ RATE =(Tn-Ta)*10,000/H WHERE H = 5.03 =. HRS OF OPERATION *10,000 Oc= 0.96 : AVG OF HRS IN A FULL OPERATING CYCLE *10,000 K = 2.00 = SAFETY FACTOR Ta= MEASURED THICKNESS Tm: MINIMUM THICKNESS l
Tn= NOMINAL THICKNESS
- NEGATIVE VALUES RESULTED BECAUSE THE MEASURED THICKNESS WAS GREATER THAN THE NOMINAL THICKNESS Performed by:
CI Date: h _\\T fl 9
Reviewed by:
Date: I
)
\\j 8 '? 4 'V O
~
ATTACHMENT 2 (CONT.)
e MEG.601 WALL. THINNING MONITORING PROGRAM CATEGORY CLASSIFICATION ON 1985 RESULTS CATEGORY I l
INSP LINE T(NOM)
T(MIN)
T(MEA)
INDEX l
POINT NO VALUE 10.1W 32140-20DB1 1.031 0.8376 0.8887 0.96 13.4 32322-24GB >
31222-12GB 0.562 0.4724 0.5090 1.81
{
14.2 32323-24GB >
34323-16GB 0.375 0.3150 0.3320 1.04 14.4 32323-24GB >
31221-12GB 0.562 0.4724 0.5080 1.73 24.2C 31725-6DB 0.500 0.4147 0.4130
-0.05 24.2E 31725-6DB 0.432 0.3185 0.211
-1.30
\\
125.2A 31724-6DB 0.432 0.3185 0.225
-1.20 CATEGORY II 09.1 32134-20DB >
32126-BDB 0.500 0.4147 0.453 2.14 13.3 32322-24GB >
31220-16GB 0.562 0.4724 0.516 2.48 18.3 34323-16GB >
34325-16GB 0.375 0.si30 0.345 2.62 24.2B 31725-6DB 0.541 0.4147 0.471 2.09 PREPARED BY___
_[hau
__DATE__h_I[_]
REVIEWED BY__
4,__
___DATE _
_\\fkfq 87947 4 7
]F '
l
o
+
P, ATTACHMENT 3 i
REFERENCES:
j I
- 1) MEG.601 - PIPE WALL THICKNESS MONITORING PROGRAM
- 2) NCRs S-6713, S-6714, S-6775, AND S-6776 1
1
- 3) WRs 134827, 134828, 129250 l
l
- 4) DRAWINGS M-330, M-853, AND M-870 1
i
\\
i l
l