ML20153F460
| ML20153F460 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 04/27/1988 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8805100336 | |
| Download: ML20153F460 (12) | |
Text
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DUKE POWER GOMPAhY P.O. Box 03180 CHARLOTTE. N.C. 28242 IIALH. TUCKER TELEPHONE vion emeerpeur (704) GM4531 secoman re mection April 27, 1988 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555 i
1 l
Subject:
McGuire Nuclear Station, Unit 2 Docket No. 50-370 ASME Code Section XI Requirements i
Relief Request No. 88-02 1
l Gentlemen:
Pursuant to 10CFR 50.55a(g)(5)(111), find attached the subject request for relief from ASME Code Section XI Requirements pertaining to McGuire Nuclear Station's
{
Nuclear Service Water system.
Included in the attachment is the request, appli-cable drawings, and material specifications. The request is being submitted prior l
to planned maintenance that will occur during the 1988 Unit 2 Refueling Outage; therefore, it is requested that NRC review and approve this request prior to May 27,1988.
Pursuant to 10CFR 170.3(y),170.12(c), and 170.21 find enclosed an application fee of $150.00.
Should there be any questions concerning this matter, please contact Steve LeRoy of Duke Nuclear Production Licensing at (704)373-6233.
Very truly yours.
Bd h
Hal B. Tucker SEL/235/jge Attachment xc:
Dr. J. Nelson Grace Mr. Darl Hood Regional Administrator, Region II U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation 101 Marietta St., NW, Suite 2900 Washington, D.C.
20555 Atlanta, GA 30323
- r de[
jd:M Assf sta e i Mr. W.T. Orders NRC Resident Inspector dO[
gdf McGuire Nuclear Station t]
y afd 8805100336 880427 M/
PDR ADOCK 05000370 P
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DUKE POWER COMPANY McGUIRE NUCLEAR STATION RELIEF REQUEST NO. 88-02 REQUEST FOR RELIEF FROM ASME CODE SECTION XI REQUIREMENT DETERMINED TO BE IMPRACTICAL 1.
Component for Which Relief is Requested:
A.
Name and Number:
1.
The welds associated with valve 2RN134, weld numbers RN2F128 and RN2F127, size 18 inches with a weld joint thickness of 0.375 inches, ASME SA-516 Grade 55 and ASME SA-285 Grade B materials.
Both of these materials are P1 Group 1 materials referenced by QW-422 of ASME Section XI.
2.
The welds associated with valve 2RN235, weld numbers RN2F160 and RN2F159, size 19 inches with a weld joint thickness of O.375 inches, ASME SA-516 Grade 55 and ASME SA-285 Grade B materials.
These welds are associated with Unit 2 Nuclear Service Water (RN) system valves that require removal and replacement to perform maintenance.
B.
Function:
The Nuclear Service Water (RN) system is a Nuclear Safety Related, open cooling system that provides cooling water from Lake Norman or the Standby Nuclear Service Water Pond (SNOWS) to various station heat exchangers during all modes of operation.
In addition, the system acts as an assured source of makeup water for various re-quirements and is the normal supply of water for the Containment Ventilation Cooling Water (RV) system.
C.
ASME III Code Class:
Equivalent Class 3 D.
Materials and Welds Welds RN2F127, RN2F128, RN2F159, and RN2F160 are groove velds with a joint thickness of 0.375 inches.
All piping material is SA-106 Grade B and pipe size for all welds is 18 inches.
The valve size for both valves is 18 inches and all valve material is ASME SA-516 Grade 55 and ASME SA-285 Grade B materials.
2.
ASME Code Section XI Requirement That Has Been Determined to be Imprac-tical:
ASME B and PB Code Section XI,1980 Edition through Winter 1980 Addenda, Article IWA-4400, IWA-5000 3.
Basis for Requesting Pelief:
Hydrostatic testing of welds referenced in Section A of this request would be impractical based on the following reason:
, I A.
The valves used for ' isolation of.the Nuclear Service Water (RN) system are a butterfly type design.and range in size - from 18 inches up to 36 inches in size.
Historically, these valves have not held design hydro pressure withaut significant leakage.
These valves are welded.into the system and cannot be easily removed without causing-the same hydro problems that presently exist. The use of' flanges in 4
the RN system is. limited, thereby limiting the use of blanks or blank flanges to enhance hydro capabilities. Additional hydro pump capacity is not available nor is it' - c onsidered usable in this situation because hydro pump leakage, past the butterfly valve seats, could potentially over pressurize other vital equipment such j
i as heat exchangers and critical instrumentation.
System pressures range from 135 PSIG to 35 PSIG.
The required design ' changes to install isolation values and/or the installation of' blanks into the system to achieve hydro capability would place an additional burden of time, manpower, and planning on Duke without a commensurate
~
increase in operational quality of the system.
The RN system is a l
low temperature, low pressure system.
Hydro pressure on the system would be 110% of design pressure or approximately 150 PSIG.
Duke feels that the additional MT or PT examination requirement compen-sates for the difference in hydro pressure' and inservice inspection pressure.
l 4.
Alternative Testing:
All welding shall be subject to a dye penetrant or magnetic particle examination on root pass and also final welding pass.
An inservice leak test at system pressure and temperature shall also be performed on all
- welds, i
5.
Why the Alternate Proposed Testing 'Will Provide an Acceptable Level of l
Quality and Safety:
A.
The ASME Code requires only a Dye Penetrant (PT) inspection or Magnetic Particle (MT) inspection on the finished weld surface for greater than 4 inches NPS.
We impose an additional PT or MT exam-ination on the root pass weld which would detect any defects in the i
root veld.
An inservice leak test at system pressure and tempera-i
]
ture would detect any leaks or defects in welds while the system is j
filled with liquid and under operating pressure. The section of the RN system in question operates at a low design pressure and tempera-ture of 135 PSIG and 95 degrees-F respectively.
Duke Power consi-ders the alternate and additional examinations more than adequate to ensure safe and consistent operational reliability of the system.
The basis for the alternate testing in that the examinations will detect any defects that would have otherwise been exposed by the pressure differential between the operating pressure and hydrostatic testing pressure. Thus, the probability of detecting any additional weld defects by hydrostatic testing is extremely low.
1 1
6.
Implementation:
The previously mentioned maintenance will occur during the Unit 2 1988 Refueling Outage scheduled to begin on May 27, 1988.
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QW 422 SECTION IX - PART QW, WELDING 1986 Edition QW-422 P-NUMBEPS Grouping of Base Metals for Qualification Minimum Type of Base Metal Specified P-Group Spec.
Tensile, ksi Nominal Product N o.
N o.
No.
Grade (Note (1)]
Composition Form Sted and Steel Alloys 1
1 SA 31 A
45-(C)
Rivets B
58 _
SA-36 58 (C-M n-Si)
Plate SA 53 Type 5, Gr. A 48 (C)
Smis. Pipe Type 5, Gr. B 60 (C-M n)
Smis. Pipe Type E, Gr. A 48 (C)
Resistance Welded Pipe Type E, Gr. B 60 (C-Mn)
Resistance We!ded Pipe Type F 45 (C)
Furnace Welded Pipe SA-2 06 A
48-(C-Si)
Smis. Pipe B
60 _
53-134 Of SA 283 and SA 285 SA-178 A
47F-(C)
Electric-Resistance Welded C
60 _
(ERW) Tube SA-179 (C)
Smis. Tube S A-181 Cl. 60 60 (C-Si)
Pipe Flange S A-192 47:
(C Si)
Smis. Tube SA 210 A1 60 (C-Si)
Sm!s. Tube S A-214 (C)
ERW Tube SA-216 WCA 60 (C-Si)
Casting l
SA 226 478 (C-Si)
ERW Tube SA-2A Marking WPB 60 (C-M n-Si)
Piping Fitting SA 266
- 01. 1 60 (C-Si)
Forging SA-283 A
45~
B 50 (C)
Plate C
55 D
M_
SA 285 A
4 5~
B
$0 (C)
Plate C
55 _
SA 333 1
55 (C-Mn)
Smts. and Welded Pipe 6
60 (C-M n-Si)
Smis. and Welded Pepe SA-334 1
55 (C-M n)
Welded Tube 6
60 (C-Un-Si)
Welded Tube See Notes at end of QW 422, 56
1986 Edidos DATA - P NUMBERS QW-422 P-NUMBERS (CONT'D)
Grouping of Base Metals for Qualification Type of Base Metal g
P.
Group Spec-Ten 4 W No.
N o.
N o.
Grade
[ Note (1))
[N "8I Product Steel and Steel Alloys (Cont'd) 1 1
SA 350 LF1 60 (C-M&Si)
Fm SA-352 LCA 60~~~
(C-Si>
g LCB 65 _
SA 369 FPA 48 (C-Si)
Forged Pipe ppb M
(C-M n-Si)
Forged pipe SA-372 Type !
60 (GM%s;)
SA-414 4
45~~
B 50 (C)
Sheet C
55 0
60 (C-Mn)
Sheet E
65 _
0 WPL6 60 (C-MSSi)
Piping Fitting SA442 55 55-(C-M n-Si)
Plate O
60 60 _
SA-487 Ct. A and AN 60 (C)
Casting SA-515 55 55 -
60 60 (C-SI)
Ptate 65 65 _
SA-516 55 55 _
(C-Si)
Plate 60 60 (C-Mn-SI)
Ptate 65 65 _
60~
(c Mn-Si)
Smls. Pipe Type !!
55 _
6 47 (C)
$Ns. Tube 60 (C-Si)
Smis. Tube SA 557 A2 47-g2 (C)
ERW Tube 60 _
62 55 (C-Mn-TI)
Ptate SA-587 48 (C)
ERW pipe SA-620 40 (C)
Sheet SA-660 WCA 60 (C)
Centrifugal Cast Pipt SA-662 A
(C-U&$i)
Plate 58 0
65 _
10 W422te*hnesen nuepapel
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4 Q W 422 SECrlON IX - PART QW, WELDING 19% Edition QW-422 P-NUM BERS Grouping of Base Metals for Qualification Minimum Type of Base Metal Specifd
' P-Group Spec.
Tensile, ksi Nosninal Pr. N t No.
No.
No.
Grade (Note (1)]
Composition Orm Steel and Steel Alloys 1
1 SA-31 A
45-(C)
Rivets B
58 _
SA 36 58 (C-Mn-Si)
Ptate SA-53 Type S, Gr. A 48 (C)
Smis. Pipe Type S, Gr. B 60 (C-Mn)
Smis. Pipe Type E, Gr. A 48 (C)
Resistance Welded Pipe Type E. Gr. B 60 (C -Mn)
Resistance Welded Pipe Type F 45 (C)
Fumace Welded Pipe SA 106 A
48 (C-Si)
Smis. Pipe B
60 _
S A 134 Of SA 283 and SA 285 SA-178 A
47F-(C)
Electric-Resistave Welded C
60 _
(ERW) T6be SA-179 (C)
Smts. Tube S A 181 Cl. 60 60 (C-Si)
Smis. Tube S A 210 A1 60 (C-Si)
Smis. Tube SA 214 (C)
ERW Tube S A 216 WCA 60 (C-Si)
Cast;ng SA 226 47:
(C-Si)
ERW Tube SA 234 Marting WPB 60 (C-M o-Si1 PipW Fitting S A-266 Cl. 1 60 sC-Si)
Forging SA 283 A
45-B 50 (C)
Ptate C
55 0
60 _
SA-285 A
45 -
B 50 (C)
Plate C
55 _
SA 333 1
55 (C-M n)
Smis, and Welded Pte 6
60 (C-M n-Si)
Smis. and Welded Pipe SA 334 1
55 (C-un)
Weided Tube 6
60 (C-U n-Si)
Welded Tube See Notes at end of QW-422.
56
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SA 516/SA 516M SECTION H - MATERIAL SPECIFICATIONS 1983 Edition be normalized unless otherwise specined by modined in accordance with Supplementary the purchaser.
Requirement Sl7, Vacuum Carbon Decal-5.4 If approved by the purchaser, cooling dized Steel,in Specincation A 20/A 20M.
rates faster than those obtained by cooling in air are permissible for improvement of the 7, MetallurgicalStrvcture toughness,provided the plate > ? subsequently 7.1 All steel shall have a fine austenitic grain tempered in the temperature range 1100 to size.
1300*F [595 to 705*C].
- 8. Mechanical Requirements 8.i Tension Test Requirements-The mate-
- 6. Chemical Requirements rial as represented by the tension-test specimens 6.1 The steel shall conform to the chemical shall conform to the requirements shown in requirements si own in Table I unless otherwise Table 2.
5UPPLEMENTARY REQUIREMENTS Supplementary requirements shall not apply unless specified in the order.
A list of standardized supplementary requirements for use at the option of the purchastr are included in ASTM Specification A 20/A 20M.Those which are considered suitable for use with this speciScation are listed below by title.
St. Vacuum Treatment, with Specification A 435/A 435M, S2. Product Analysis, S9. Magneti-Particle Examination, S3. Simulated Post Weld Heat Treatment of SI1. Ultrasonic Examination in accordance Mechanical Test Coupons, with Specincation A 577/A 577M, S4.1 Additional Tension Test, S12. Ultrasonic Examination in accordance SS. Charpy V Notch Impact Test, with Specincation A 578/A 578M, S6. Drop Weight Test, S14. Bend Test, and S7. High Temperature Tension Test, S17. Vacuum Carbon Deoaidized Steel S8. Ultrasonic Examinadon h accordance TABLEl Gemical teguiremeses Compcamoa.%
Grade 53 Grade 60 Grade 65 Grade 70
[Orade 3801 l Grade 415]
(Grade 45o)
[ Grade 4:51 Carboa, mar *.
% a 112.5 mal and ander 0.18 0.21 0 24 0 27 Over 4 a to 2 in. [11.5 to 50 mmL inci 0.20 0.23 0.26 0.28 Over 2 a to 4 in.150 to 100 mmL iact 0 22 0.23 0.28 030 Over 4 to 4 a (100 to 200 mmL tact 0.24 047 0 29 0 31 Over 8 ist [200 mm) 0.26 0.27 0.29 0 31 Manganese:
Na. [12.5] and under.
a Heat analysts 0 6M 90 0 6M 90 0 tbl.20 0.4b i.20 a
Product analyssn 0.3$-0 98 0.55-0 98 0.79-I.30 0.79-I 30 Over 4 is (12.5):
Heat acalyms 0 60-1.20 0 SS-1.20 0 tbI20 0.I5-120 PrMuct 0.3bi30 0.79-t 30 0.79-t 30 0.79-130 Phosphorus.
0 035 0 035 0.035 0 035
$ultar, mas' O.04 0.04 0 04 0 04
$dicoa.
Hast analysis 415-040 0.15-0.40 0.lbo 40 0.15-0 40 j
Product amalysis
- 0. lM 45 0.lM.45 013-043 0.lb0 45
- Appbes to bcah heat and product anal
' Grade 60 ice % in. [12.3 mm] anc aer in thadtness assy be specified to have 0.85-1.20 % mangamePe on heat analys* and O.
I30 % maaganese on procact analysia.
TABt.12 Temese Requereaneers Orade 35 [380l 60 l4I51 65 H50]
70 H45)
Teasde strength. kmjM,al 55-73 [380-515]
60-80 Hl5454 63-s5 H50-585) 70-90 H854201 Yictd strength,sua, kai[MPal 30.205) 32 [220]
35(2401 381260[
Doegsta in B a l2CO mat sua. 4 23*
21*
I t*
I78 Dongationin 2 a 150 sunk mua 4 27' 23*
23*
218
- See Specifkation A 20/A 20M 8 Determined by either the 0.2 % otrase asethod or the 0.5 % eatension-under4oad method.
648 i
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1983 Edition PART A - FERROUS MATERIALS SA 106 a
q the performance of all inspection and test re-proved by the purchaser. De purchaser shall
[v) quirements specified heresa. Except as other-have the right to perform any of the inspections wise specified in the contract, the producer may and tests set forth in this specincation where use his own. or any other suitable facilities for such inspections are deemed n~* aary to en-the performance of the inspection and test re-sure that the material conforms to the pre-e quirements specined hereta, unless disap-scribed requirements, i
i SUPPLEMENTARY REQUIREMENTS FOR PIPE REQUIRING SPECIAL CONSIDERATION One or more of the following supplementary requirements shall apply only when i
specified in the purchase order. The purchaser may specify a different frequency of 1
test or analysis than is provided in the supplementary requirement. Subject to j
agreement between the purchaser and manufacturer, retest and retreatment provi-sions of these supplementary requirements mav also be modified.
8 St. Product Analysis factory completion of the first step of the nat.
S t.1 Product analysts shall be made on each tentag test requiremet, eat pipe shall be re-length of pipe. In'dividual lengths failing to jec ed subject to retreatment in accordance with S ecification A 530 and satisfactory retest. If a P
conform to the chemical composition require.
ments shall be rejected.
Nu frm8 any le888 f tPe fails because P
of a lack of soundness, that length shall be S2. Transrerse Tension Test rejected, unless subecquent retesting indicates S2.1 A transverse tension test shall be made dat de mnain ng lenge is sound on a specimen from one end or both ends of each pipe NPS 8 and over. If this supplemen-S4. Metal Striseture and Etching Test tary requirement is specined, the number of S4.1 The steel shall be homogeneous as tests per pipe shan also be specified. If a spec-shown by etching tests conducted in accordance imen from any length fails to meet the required with the appropriate sections of Method E 381.
O tensile properties (tensile, yield, and clongs-Etching tests shall be made on a cross section tion), that leegdi shall be rejected subject to from one end or both ends of each pipe and 1
retreatment in accordance with Specification shall show sound and reasonably uniform ma-A 530 and satisfactory retest.
terial free from injurious faminations, cracks, and aimilar objectionable defects, if this sup.
S3, Flattening Test plementary requirement is specined, the num-S3.1 The nattening test of Spectncation ber of tests per pipe required shall also be A 530 shall 14 made on a specimen from one specined. If a specimen from any length shows end or both ends of each pipe. Crop ends may objectionable defects, the leagth shall be re-be used. If this supplementary requirement is jected, subject to removal of the defective end specined, the number of tests per pipe shall also and subsequent retests indicating the remainder be specined. If a specsmen from any length of the length to be sound and reasonably uni-fails because of1sck of ductility prior to satis-form material.
O EXPLANATC A / NOTES Nors 1 No tion abould be given to poesi-should be used for close ceiling, cold bending, or for ra ble graphitization of the matenal at the hieber tem-forge welding. The purpose for which the pipe is to peratures at which it may be used.
be used should be stated ta the order. Tbs acte is not intended to prolubit the cold bendaag of Grade Nora 2-Grade A rather than Grade B pipe B seamless pipe.
TAtt2 I chouered "
Cv%
Greae A Orede B Oceae C Carboe. maa Ol$
000 0.35 heaneanne 01%4e) 03-t hs 0 3-lDs Phosphorwe, man 00e8 Odes 00et SalAsr. maa 0.0,0 0.0,0 0.0,0 Ss
$s Ss o
- mm 151
h y m : w n ;:
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~1 SA 285/SA 285M SECTION II - MATERIAL SPECIFICATIONS 1543 Edition
~
O S83 SUPPLEMENTARY REQUIRE.\\lENTS Supplementary requirements shall not apply unless specirled in the order.
A list of standardized supplementary requirements for use at the option of the purchaser are included in Specification A 20/A 20M. Those which are con-sidered suitable for use with this specification are listed below by title.
S3. Simulated Post Weld Heat Treatment of Mechanical Test Coupons.
S4.1 Additional Tension Test.
S14. Bend Test.
Also listed below are additional opt 4onal supplementary requirements suit.
able for this specification.
S$7. The copper content, by heat analysis S58. The masimum incidental copper con.
shall be 0.20 0.35 percent and by product tent by heat analysis shall not esceed 0.25 analy sis 0.18 037 percent.
percent.
TABLE 1 Chemical Rguireements Com position, percent Elements Grade A Grade B Grade C Carboa, mam' O.17 0.22' O.28 Manganese, maa Heat analysis 0.90 0.90 0.90 Product analysis 0.98 0.93 0.98 I%osphorus maz 0.03s 0.03 $
0.03:
Sutter maxh 0.040 0.040 0.040 8Appued to both heat and product analysis.
l S83 TABt2 2 TameSe "-
Orade A Orade B Grade C l
W Nh]
W Nh)
W Nh]
Teasde strength 45-43
[310450l
$0-70 psS-485)
SS-75 1380-515]
Yield strength. mia' 34
[165]
27 (It$)
30
[205]
Dongance sa 8 u or [200 mmL una. la 27 2$
23 Flanganna a 2 n or [S0 mmL e% 4 30 28 27
- Determuned by other the 0.2 5 othes mahod er the 0.3 5 sm-knad method 8 See SpeaAcnoce A 20/A 20M.
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