ML12173A312
| ML12173A312 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/18/2012 |
| From: | Gillespie T Duke Energy Corp, Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| ON-SRP-HPI-03 | |
| Download: ML12173A312 (6) | |
Text
T. PRESTON GILLESPIE, JR.
Vice President ENnergy Oconee Nuclear Station Duke Energy ONOl VP / 7800 Rochester Hwy.
Seneca, SC 29672 June 18, 2012 864-873-4478 864-873-4208 fax T. Gillespie@duke-energy. corn U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555
Subject:
Duke Energy Carolinas, LLC Oconee Nuclear Station Units 1, 2, 3 Docket Nos. 50-269, -270, -287 Fifth Ten-Year Inservice Test Program Interval Pump Specific Relief Request No. ON-SRP-HPI-03 Pursuant to 10 CFR 50.55a(f)(5)(iii) and 10 CFR 50.4, Oconee Nuclear Station (ONS) hereby request Nuclear Regulatory Commission (NRC) approval of the following Code relief for the fifth ten-year interval inservice test program.
The relief requested is from certain requirements for vibration monitoring specified by the American Society of Mechanical Engineers (ASME) Operational and Maintenance Code 2004 Edition, 2005 and 2006 Addenda. This request is to allow Duke Energy Carolinas, LLC (Duke Energy) to take exception to vibration monitoring requirements for the upper motor bearing housing on the High Pressure Injection pumps for all three ONS units on the basis of impracticality. Details of the determination of impracticality are provided in the enclosed 10CFR50.55a request.
This submittal document contains no regulatory commitments.
If there are any questions or further information is needed, you may contact Corey Gray at (864) 873-6325.
Sincerely, T. Preston Gillespie Jr.,
Site Vice President
Enclosure:
Pump Specific Relief Request 10 CFR 50.55a Request Number: ON-SRP-HPI-03 www. duke-energy. com
U. S. Nuclear Regulatory Commission June 18, 2012 Page 2 Xc w/encl:
Victor Mcree Region II Administrator U. S. Nuclear Regulatory Commission Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, Ga 303003-1257 John Boska Project Manager U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Mail Stop 0-8 G9A Washington, DC 20555 Xc w/o encl:
Andy Sabisch NRC Senior Resident Inspector Oconee Nuclear Station Susan Jenkins Section Manager Division of Waste Management Bureau of Land and Waste Management SC Dept. of Health & Environment Control 2600 Bull St.
Columbia, SC 29201
Enclosure Pump Specific Relief Request 10 CFR 50.55a Request Number: ON-SRP-HPI-03
Oconee Units 1, 2, 3 Pump Specific Relief Request 10 CFR 50.55a Request Number: ON-SRP-HPI-03 Relief Requested In Accordance with 10 CFR 50.55a(f)(5)(iii)
Inservice Testing Impracticality -----
- 1. ASME Code Component(s) Affected 1HPIPU0001, 1HPIPU0002, 1HPIPU0003 2HPIPU0001, 2HPIPU0002, 2HPIPU0003 3HPIPU0001, 3HPIPU0002, 3HPIPU0003
2. Applicable Code Edition and Addenda
ASME Operational and Maintenance Code (OM) 2004 Edition, 2005 and 2006 Addenda
3. Applicable Code Requirement
Per OMb-2006 Subsection ISTB 3540 b, vibration measurements shall be taken on the upper motor bearing housing in three approximately orthogonal directions, one of which is the axial direction for vertical line shaft pumps.
4. Impracticality of Compliance
The OM Code required vibration measurements on the upper motor bearing housing for the subject pumps are impractical on the basis of inaccessibility due to location and design features of the motor. Plant design does not include permanent scaffolding or ladders which provide access to the top of the motors for the subject pumps. Also, the upper motor bearing housing is contained within a cone shaped fiberglass protective shroud which obstructs access to the bearing housing and prevents performance of the axial vibration measurement (See attached drawing OM-0314-0063 for details). In order to perform the required measurements, the component would need to be redesigned to eliminate the shroud or the shroud would have to be removed for each test. Both of these options are impractical. In addition, removal of the shroud during pump operation to provide direct access to the bearing housing would create an additional equipment concern due to the potential for foreign material intrusion and component damage.
Vibration measurements taken on the fiberglass shroud would not provide useful or meaningful information.
5. Burden Caused by Compliance
To facilitate compliance with the Code testing requirement, the plant would need to be modified to provide a permanent ladder and platform for access to the bearing on each of nine motors. Also each pump/motor assembly would have to be redesigned to remove the bearing shroud during pump operation.
Since this would subject the component to potential damage by foreign material intrusion, the pump/motor redesign 7/1/12 ON-SRP-HPI-03 Rev. 27 Page 1 of2
Oconee Units 1, 2, 3 would have to provide protection from foreign material intrusion while still allowing access. These modifications are impractical and create unnecessary burden.
6. Proposed Alternative and Basis for Use
The HPI pumps are considered Group A, vertical line shaft pumps. Quarterly vibration readings are taken at two locations on the motor and two locations on the pump.
Locations on the motor are at the inboard bearing and approximately midway on the motor housing. Locations on the pump are the pump inboard bearing and on the pump stand.
At each location, vibration measurements are recorded in two approximately orthogonal directions perpendicular to the rotating shaft.
These locations have been chosen for monitoring in an effort to identify specific failure modes and have proven to provide early indication of abnormal pump / motor performance.
Monitoring of the pump / motor vibrations at these locations will ensure the health of the pump is sufficiently examined.
It is worth noting that the OM Code imposes more stringent hydraulic acceptance criteria on these pumps than for horizontal centrifugal or positive displacement pumps. This more stringent hydraulic acceptance criteria places more emphasis on detection of degradation through hydraulic test data than through mechanical test data.
Application of the OM hydraulic testing criteria along with radial vibration monitoring in the areas described above will provide adequate data for assessing the condition of the subject pumps and for monitoring degradation. Therefore, reasonable assurance of operational readiness for these pumps will be maintained.
7. Duration of Proposed Alternative
This proposed test alternative will be imposed for the duration of the Fifth 120 month interval (which begins July 1, 2012).
8. Precedents
Specific relief has been granted from the code vibration requirements where the upper motor bearing housing is inaccessible (Oconee Safety Evaluation dated March 28, 2011, Docket numbers 50-269, 50-270, 50-287, TAC numbers ME3840, ME3841, ME3842, ME5790, ME5791, ME5792). (Hatch Safety Evaluation dated June 13, 1994, Docket numbers 50-321 and 50-366, TAC numbers M59202, M59203, M83192, M83193).
7/1112 ON-SRP-HPI-03 Rev. 27 Page 2 of 2
- NOTES,
BASIC ORDER NO. 3021A-3, HOLE DEPTH 15.5 FOR UPPER T. C.,14. 5 HOLE DEPTH FOR LOWER T. C. PLUS ADD CU. GROUND WIRE WELDED TO HOT JUNCTION.
- 2.
UPPER BRG IS A WAUKESHA 10.5 THRUST BRG. PER WESTINGHOUSE'S -209C288GOI
- 3.
EXPANDED METAL SCREENS ON BRACKETS AND FRAM.E OPENINGS.
- 4.
ALL COND. BOXES ASSEMBLED FOR TOP ENTRY.
- 5. TWO GPM OF WATER 9 PAX INLET TEMP4.
OF 33'C ANDS4 OUTLET TEMP OF 47C OR FOUR GPM OF WATER H MAX.
INLET TEOP OF 38"C REQUIRED TO COOL TOP BEARING. WATER MUST BE CLEAN AND FREE OF SEDIMENT.
- 6.
APPROX. WT. OF MOTOR 5950 LBS.
- 7. SHALL AUX. COND BOX IS FOR 115 VOLT, 1.91 AMPS. 200 WATT SPACE HEATER LEADS
- 8. ROTOR CORE INFORMATION ROTOR LENOTH-14.00 ROTOR DIA.-15.300 ROTOR WT.-APPROX. 1000 LBS.
- 9. HPI HOTOR SHAFT EXTENSION MAY BE MACHINED AS MU1CH AS. 024 BELOW THE ORIGINAL 2.124" MINIMUM DIAMETER TOLERANCE WITHOUT AFFECTING SHAFT STRENGTH.
MOTOR HALF COUPLINGS ARE PURCHASED UN-BORED AND ARE CUSTOM FIT TO 1NDIVIDUAL SHAFTS. OOCUMENTATION OF INDIVIDUAL MOTOR SHAFT SIZES IS NOT REQUIRED UNLESS MACHINED LESS THAN 2. IOF DIAMETER. SEE OM 314-B01B 001, SUPPLEMENTAL IFOIRMATION TO WESTINO INSTRUCTION BOOK I.L. 3830-3. FOR ADDITIONAL DETAILS. THIS NOTE DOCUMENTS THE FOLLOWING SHAFT MACHINE, SHAFT *CH-117BI-I MACHINED
- 11. ALTERNATE MOTOR TO MOTOR-STAND BOLTING CONFIGURATION FOR ALL HPI MOTORS, 274D55 Z
Z 5
EXCEPT FOR 2B-HPI WHICH WILL REQUIRE (12)
BOLTS DUE TO VIBRATION. EIGHT (8)
'2 ADDITIONAL HOLES HAY BE DRILLED 20" ON EACH SIDE OF EXISTING FOUR (4)
HOLES TO IMPROVE STIFFNESS AND REDUCE MOTOR VIBRATION.
EVALUATION FOR ADDITIONAL BOLTING PERFORMED PER ONOE-0167.
MttIN CONDIUT BOX SUPPLIED HED ROB=25T..
N.
UH RILFDCN G-T BE DRILLED MACHIRED FROM 2. 125 TO NO LESS THAN 2. 100.
UyNRLE
-US TO
- 10.
SCREWS FOR MOTOR LEAD BOX SHALL BE REPLACE 3ELT BYSUSTR. VWITH NON GAI CARBON STEEL THUMBSCREWS.
131 ELASTIMOLO BUSHINGS KIBOC4 OR # 180-C4 V
\\
OKINO DOWN ON (200 AMP)
SEE NOTE 13 13.2--l ELASTIMO 151LR OR SERIES I CUSTOMER CONNECTO TO CABLE 154LR AN NOT REOG 24.2 0
1 02-2972)
I
.2 LIFTING LUGS-DIA.OPP.
- 42. 9.-*
BRG. T.C. SUPPLIED WITH 1
30
\\.500-14 NPT COND.
/
~
G 01
_I**
/\\OTLET.
DETAIL OF BRG. T.C.
TERM BLOCKS llfi° 1c0 OPTIONAL INLET WATER T. C.
30.45 WATER" INLET WATER COOLING LE s"
COIL-INLET & OUTLET.*-'
.N N
- r
.250-14 NPT HLTER OUTLEFOR1.
C KOUT INOETIONALO OUTLET DBS WATER TO.C.
v L_
AUX. BOX SUPPLIED WITH A HOLE FU ONOUIT & A KNOCKOUT FOR.76 CONDUIT.
FOR T....TERM.
BOARD SCHEMATIC)
- _u
- D LD ELBOW RECE 154LR OR 156 o BE SUPPLIED ELASTIMOLD AS ARE TO BE TO PREVENT 0 15LR CONNR IRE TAPING (R
- 12. OPTIONAL THERMOCOUPLER INSTALLATION FOR HPI MOTORS. THERMOCOUPLES ARE
.06 x 45oCH'PR.
USED TO MONITOR INLET AND OUTLET COOLING WATER TEMPERATURE FOR UPPER BEARING OIL COOLER. SEE OM 314-0120 001.
SUPPLEMENTAL INFORMATION TO WESTINGHOUSE INSTRUCTION BOOK I.L.3830-3. FOR ADDITIONAL DETAILS.
20 HE
- 13.
ELASTIMOLD BUSHINGS SHALL BE INSTALLED BY WELDING OR BOLTING.
.250 R
FOR THE WELDED CONNECTION, REFER TO O 314.
-009 001 FOR THE APPROPRIATE WELDING GUIDELINES.
NOUSE FOR THE BOLTED CONNECTION, DRILL (4) 3t + Y4" DIAMETER HOLES IN THE BUSHING FLANGE AND THE SUPPORT BRACKET, ON A 23A" BOLT CIRCLE, 90 DEGREES APART. BETWEEN THE FLANGE BAIL TABS. USE THE FOLLOWING PARTS To INSTALL EACH ELASTIMOLD BUSHING, (4)
- C I0. 32 UNRF-3A, ALLOY STEEL ASTM
.40R I
04h.J HEX SOCKET SCREW OR EQUIVALE.NT**
1*
(4),10.32 UNF-DS CARBON STEEL NUTS OR 75( )
EQUIVALENT (4)
- 10 REGULAR HELICAL CARBON STEEL I *
- 18. 12 LOCK WASHERS OR EGUIVALENT DETAIL OF SHAFT EXT EPTACLE
- 13. 12 41.0 (PER INGERSOLLU.
RD M 7304.10 6LR 1SHEE 385-StYLE 02)
D BY
- 3. 00-,
151LR TAPED LOOSENINO, ECTORS SO F
200 REF. PIP "1
.1 1.0
-ý250 MIN, O
NOTE I1
.JI
, I SF*D i
- -1*
-
- b X UPPER I LOWER Yli JUNCTION BOO EN
.8125 OIA. DRILL-
-51 'l 4 HOLES-EO. SPACED AS SHG
.48515)
ALTERNATE DESIGN PER NOTE
-4 12 HOLES SPACED AS SHOWN
________________________52. 76 58.5
- 82. 9-WATER COOLING COIL 04.
OWN.
11 14.T/C JUNCTION BOX LOCATION IS ARPROýUMATE AND MAY BE RELOCATED WITHIN +/- 6" FROM CURRENT LOCATION TO AVOID INTERFERENCE.
DRILL AND TAP BOx MOUNTING THROUGH HOLES I/4-2D PER EXISTING BOX. GRILL AND TAP 10-24 HOLES AS NEEDED FOR RELOCATING T/C CABLE CLAMPS. TIGHTEN PER GOOD MAINTENANCE PRACTICES. CLAMP SCREWS ARE 10-24 BY 1/2, BOX SCREWS ARE 1/4-2D BY 1.25.
USE BOLTS/SCREWS AS NEEDED TO PLUG ABONDED HOLES.
-I09..ECI..23 F-EHI,- P I,-W-* EWC-W-1 OA CONDITION I D8 OE-17911 FMHWIj-Z'ICWC jT2'*
DOC I9-A 2
W IEJW W
A D7 GE-17717 JHA I 2ýI MLM I L2'- IODC I Lý- W EJW I W OM 314.-0063 001 D6 REV. PER 0E-12977 RLS 171I/6 1 LEA 0-11-1 1 RLB L7-Il RCL
-I I1 10 1 E.PER 01-120*
j~I El-l"-I MS I 11-1Io01RLB 0.1-"l-I Sj,
JAK JOB 03 OE-61R7 IDOMt~ HAS SLB 1F67 4
O
.18 02 OE-4439
.IW0AB IIll MOM IrllT 13 I;
AV Dl 434 9*1725 OSS 14
' 1Jv 14 JLC f.A-2Ll.I WESTINDICILSE ELECTRIC CORPOATIONH
.ILp
.1 MOTOR LAC FRAMMEB8O.5P3@ TSSOP CSPJ OUTILINE (SPEC ziKE POE 0.
544 4
D15_____
I S1TUTUS ND.
REV IS~IONS.
liii I ICIWILIELEC.II'EGA.I TSR IOATFITAKTIISATFIAPPB I SATE I
I I
INSPECTED