ML20148U133
| ML20148U133 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 01/28/1988 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8802030479 | |
| Download: ML20148U133 (7) | |
Text
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Duxn Powna GoMiwxy P.O. IM)X WileM)
CH A Hl.OTTr N.C. 246242 HALft.TUCKEN tet.arnown
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January 28, 1988 U.S. Nuclear Regulatory Commission Document Control Desk Washington. D.C.
20555
Subject:
McGuire Nuclear Station. Unit 1 Docket No. 50-369 ASME Code Section XI Requirements Relief Request No. 88-01 Centlement Pursuant to 10CFR 50.55a(g)(5)(iii), find attached the subject request for relief from ASME Code Section XI Requirements pertaining to McGuire Nuclear Station's Nuclear Service Water system piping.
Pursuant to 10CFR 170.3(y).170.12(c), and 170.21 find enclosed an application fee of $150.00.
Should there be any questions concerning this letter. please contact Steve LeRoy of Duke Licensing at (704)373-6233.
Very truly yours.
1ld'.&44-8 Hal B. Tucker SEL/219/j ge Attachment xc:
Dr. J. Nelson Grace Regional Administrator Region II U.S. Nuclear Regulatory Comission 101 Marietta St.
NV. Suite 2900 Atlanta. CA 30323 Mr. Darl Hood U.S. Nuclear Regulatory Comission
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Office of Nuclear Reactor Regulation jf( k k[y f r-Washington, D.C.
20555 l$U Mr. W.T. Orders i
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NRC Resident Inspector f
McGuire Nuclear Station 369 P
DUKE POWER COMPANY McGUIRE NUCLEAR STATION RELIEF REQUEST No. 88-01 REQUEST FOR RELIEF FROM ASME CODE SECTION XI REQUIREMENT DETERMINED TO BE IMPRACTICAL 1.
Component for Which Relief is Requested A.
Name and Numbert Weld Numbers RN1F 841A, RN 507-2, and 1RN-EIP4B-1 The pipe size for these welds is 24".
Weld number RN1T 841A is a pipe to 90 degrees elbow weld.
The pipe material is Grade B SA106 and the elbow is SA 234 WPB.
Weld number RN 507-2 is a base metal repair to the elbow. Notet A small hole was cut in the bottom of the elbow approximately 2" from the pipe to allow for water drainage.
Thickness for pipe and elbow is 0.3 75".
Weld number 1RN-EXP4B-1 is a seal weld repair made to a small eroded section of old weld metal where the bellows to seal weld is located.
The bellows material is SA 240T321.
These welds are on the Unit 1 Nuclear Service Water System (RN) which has a low design pressure of 35 PSIC and temperature of 95 degrees-F.
B.
Function:
The Nuclear Service Water System (RN) is a Nuclear Safety Related open cooling system that provides cooling water from Lake Norman or the Standby Nuclear Service Water Pond (SNSWP) to various require-ments, and is the normal supply of water for the Containment Vent-11ation Cooling Water System (RV).
C.
ASME III Code Classt Equivalent Class 3 D.
Materials and Welds Weld RN1T 841A is a pipe to 90 degrees elbow groove veld on 24" pipe with a joint thickness of 0.375".
Weld RN 507-2 is a base netal repair to 24" elbow with a joint thickness of 0.375".
Weld nuabar 1RN-EXP4B-1 is a seal weld made in the portion of the veld where the bellows is welded to the pipe.
Bellows material is SA 240T321 with a thickness of 0.032".
Piping material is Grade B SA 106 and the 90 degrees elbov is SA 234 WPB material.
2.
ASME Code Section XI Requirement That Has Been Determined to be Imprac-tical:
ASME B and PV Code Section XI,1980 Edition through Winter 1980 Addenda.
Article IWA-4400. IWD-5000
2 I
3.
Basis for Requesting Relief Hydrostatic testing of welds referenced in Section A of this request would be impractical based on the following reason:
A.
The section of piping containing the subject velds cannot be ade-quately isolated for the required hydrostatic testing due to the design of the butterfly valves that would be required for isolation of the piping.
The pump capacity to pressurize the line is not available to offset the inherent leakage of the butterfly valves used for isolation.
To perform the required hydrostatic testing would place Duke under the burden of involuntarily removing Unit 1 from service.
4.
Alternative Testing:
All velding shall be subject to a Dye Penetrant (PT) or Magnetic Particle (MT) inspection on veld root pass and also final velding pass.
For veld number 1RN-EXP 4 B-1, only one veld pass is required; therefore, a Dye Penetrant inspection vill be performed on this veld.
Base metal repair vill have a Radiographic inspection (RT) of the final veld. An inservice i
leak test at system pressure and temperature vill also be performed on both velds.
5.
Why the Alternate Proposed Testing Will Provide an Acceptable 1.evel of i
Quality and Safety, and Not Endanger the Public Health and Safety:
1 i
A.
The ASME Code requires only a Dye Penetrant (PT) inspection or l
Magnetic Particle (MT) inspection on the finished veld surface for greater than 4" NPS. We impose an additional PT or MT inspection on I
the root pass veld which would detect any defects in the root veld.
On a base metal repair, the ASME Code requires Magnetic Particle (MT) or Dye Penetrant (PT) inspection on the finished veld surface and also a Radiographic inspection (RT) of the final veld surface.
We impose an additional Magnetic Particle (MT) or Dye Penetrant (PT) test on the root pass veld.
In addition to these tests, an inservice leak test at system pres-sure and temperature vill be performad which would detect any l
through vall leaks or defects in the velds.
6.
Implementation:
January 28. 1988
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