ML20044G416
| ML20044G416 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 05/18/1993 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9306030057 | |
| Download: ML20044G416 (6) | |
Text
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Duke Ibwer Company T C AlcustttN McGuire Nuclear Generation Department Vice Presiderit 12700 Hagers Ferry Road (AfG01A)
(704)875 4 800 Hunterst:ille, NC 28078-8985 (104)R754809 fax.
DUKEPOWER May 18, 1993 U.
S.
Nuclear Regulatory Commission Attention: Document Control Desk z i Washington, D.
C.
20555
Subject:
McGuire Nuclear Station,. Units 1 and 2 Docket Nos. 50-369 and 50-370 Section XI Inservice Inspection (ISI)
Hydrostatic Testing,.First Interval Relief Request 93-02 l
Dear Sir; Pursc3nt to 10 CFR 50.55(g)(5)(iii), I am submitting the attached relief request for NRC review and approval.
This request for relief from the requirements of Section XI of the ASME code involves a hydrostatic test of the class B piping within mechanical penetrations M372 and M373 during
-l the first interval. These penetrations are part of the glycol-water mixture supply:and return lines for the ice l
condenser' refrigerant system (NF).
j 1
Please note that by letter dated August 19, 1992, a relief request to extend the first ten year ISI interval to coincide with the start of the end-of-cycle 8 refueling outage for McGuire Unit 1 was submitted.
Approval by the NRC was provided by a December 28, 1992 letter.
This extension was needed in order to complete all of the remaining hydrostatic tests for the first interval.
One of the remaining test to be performed is that of the Class B piping of penetrations M372 and M373.
As such, approval of this submittal prior to June 7, 1993, which coincides with the current schedule for entering mode 4, is requested.
Approval by this date is necessary because the remaining hydrostatic tests for the first ten year ISI interval need to be completed prior to the restart of Unit 1 from its-l current refueling outage.
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Nuclear Regulatory Commission May 18, 1993 page 2 L
Should there be any questions regarding this matter, please-contact Paul Guill at (704) 875-4002.
Very truly yours, hl
/-
T.
C.
McMeekin s
xc:
Mr.
S.
D.
Ebneter Regional Administrator, Region II U.
S.
Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr.
P.
K. Van Doorn Senior NRC Resident Inspector, McGuire McGuire Nuclear Station Mr. Victor Nerses, Project Manager Office of Nuclear Reactor Regulation U.
S.
Nuclear Regulatory Commission One White Flint North, Mail Stop 9H3 Washington, D.C.
20555 John C.
Brooks, Commissioner of Labor Attention: Director, Boiler & Pressure Vessel Division Department of Labor State of North Carolina 4 West Edenton Street Raleigh, North Carolina 27601 4
4 0
. - +.
-i
_U.
S. Nuclear Regulatory. Commission' May 18, 1993 Page 3 bec: with attachments R. O.
Sharpe.
P.
F. Guill.
R.
D. Klein (MG01MM) e J. O.
Barbour G. A.
Copp J. W.
Boyle (MG01WC)
-R. B. Travis (MG01CP)
J.
L. Parker (MG01CP)
G. J. Holbrooks (MG01CP)
.i B. H. Hamilton (MG010P)
R. A. Johansen (MG010P) l M.
D.
Kimray (MG01WC)
R.
B. White, Jr. (MG01MM) l R.
Branch (MG01MM)
File: 801.01
\\pfg085.nrc 1
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1
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ATTACHMENT DUKE POWER COMPANY MCGUIRE NUCLEAR STATION Request for Relief From ASME Code Section XI Requirements I.
Component for Which Relief is Requested A.
Name and Identification Number Class B piping within Containment Penetrations M372 and M373; Item Number C07.021.045; Flow diagram MC-1558-4.0 (Flow diagram is attached)
B.
Function The supply and return glycol-water mixture lines for the ice condenser refrigeration system (NF).
C.
ASME Section XI Code Class Class 2 D.
Valve Category Not applicable II.
ASME Code Section XI Requirement That Has Been Determined To Be Impractical ASME Code Section XI, 1980 Edition through Winter 1980 Addenda, subsection IWC, Subarticle 2500, table IWC-2500-1, Examination Ct.tegory C-H (All Pressure Retaining Components), Item Number C7.21
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.III. Basis for Requesting Relief The examination specified by the code is a system hydrostatic test of the class B piping for mechanical penetrations M372 and M373.
These penetrations are part of the glycol-water mixture supply and return lines for the Ice Condenser Refrigeration System (NF).
The lines are 4 inch carbon steel piping that is insulated.
The examination' method specified by the code is a VT-2 visual exam.
IWA-5242 delineates the requirements for. performing a VT-2 visual examination of an insulated component.
Briefly, IWA-5242 states that a VT-2 visual exam may be performed without removing insulation provided that; 1) accessible and exposed surfaces and joints of insulation are examined; 2) vertical surfaces of insulation are examined at the lowest elevation; and 3) horizontal surfaces be examined at each insulation joint.
If the insulation surfaces are inaccessible for direct examinations, then only surrounding areas need be examined.
The piping in question for penetrations M372 and M373 are.
encapsulated with ice and frost.
Due to this layer of. ice and frost, a VT-2 visual examination can not be performed in accordance with the requirements specified within the ASME-Section XI code.
The inspectors during the examination are not able to observe the appropriate areas.for any signs of possible leakage.
This layer of ice and frost on the piping is believed to be due to the nature of the fluid (glycol-water mixture) within the piping.
{
As such, to perform the code required VT-2 visual examination,, the insulation around the piping will'need to be removed.
The NF system would have to be shutdown for an extended period of time in order to: remove the insulation, drain the glycol-water mixture, perform the examination, and to re-install the insulation.
Since these lines are in service at all times to maintain the weight of the ice baskets, the NF system can not be shut down and the glycol-water mixture drained.
Doing so would result in the degradation of the safety related ice condenser system due to melting of the ice.
Further, the recovery from such an incident would be a significant burden due to the need to re-weight the ice baskets and the possible need to reload some.
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IV.
' Alternate Testing In lieu of.the system hydrostatic test, tne surveillance requirement of technical specification (TS) 4.6.1.2d.4)-
j would be performed.
This TS surveillance specifies that the j
type C test for penetrations M372 and M373 can be-performed with glycol-water mixture as the pressurizing fluid, provided that a zero indicated leakage rate is measured.
V.
Implementation Schedule The proposed alternate testing will be performed prior to~
startup of cycle 9 for unit 1.
For Unit 2, the proposed alternate testing will be performed during the end-of-cycle 8 refueling outage.
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