ML20235H063

Forwards Relief Request 89-02 for Exemption from ASME Hydrostatic Testing Requirements Re Mods on Svc Water Sys. First of Six Mods Scheduled for Implementation Jul 1989

ML20235H063
Person / Time
Site:	McGuire, Mcguire
Issue date:	02/16/1989
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8902230456
Download: ML20235H063 (15)

Text

_ _ - _ - - - - _ _

DukeIbwer Company

HAL U Tucker ;

. PO Box 33198 ~

l' ice President.

. Charlotte, N.C 28242.

Nuclear Production r

. (704}173 4531' l

DUKEPOWER L

February 16,'1989 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.

20555

Subject:

McGuire Nuclear Station,. Units 1 and 2 Docket Nos. 50-369 and 50-370 ASME Code Section XI Hydrostatic Testing Requirements Relief Request No'. 89-02 Gentlemen:

Pursuant.to 10 CFR.50.55a(g)(5)(iii), find attached the subject relief request that' applies for exemption from ASME hydrostatic testing requirements as they pretain to modif.ications on the McGuire Nuclear Service Water system. There are a total of six modifications. The first modification is scheduled for

' implementation around July 1989; therefore, it is requested that NRC review and Japproval be obtained prior to that date.

Should there be ary questions concerning this matter, please contact S.E. LeRoy at

'(704) 373-6233.

Very'truly yours,

/dB&/

Hal B. Tucker SEL/ relief 3/sel Attachment xc: Mr. M.L. Ernst Deputy Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta St., NW, Suite 2900 Atlanta, GA 30323 Mr. Darl Hood U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D.C.

20555

.0 Mr. P.K. Van Doorn i

NRC Resident Inspector

, g McGuire Nuclear Station 8902230456 890216 E

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' - U.S.. Nuclear Regulatory Commission-3 LRelief' Request No. 89-02 February'.16 1989.

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C.B. Cheezem (QA)

H.E. Edwards R.L. Gill; l>

E.0. McCraw (MNS) l P.B. Nardoci

R.0..Sharpe'-(MNS)

J.S. Warren MC-801.01.

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February 16 1989' DUKE POWER COMPANY' McGUIRE NUCLEAR STATION, UNITS 1 REQUEST FOR RELIEF FROM ASME CODE SECTION XI REQUIREMENTS RELIEF REQUEST NO. 89-02 1.

Component For Which Relief Is Requested:

A.

Components:

1)- ' Welds and flange connections on NSMs MG-12233 Rev.0 and MG-22233 Rev. O, (see attachment 1).

2)

Welds and flange connections on NSMs MG-12243 Rev.0 and MG-22243 Rev. 0, (see attachment 2).

3)

Welds and flange connections on NSMs MG-22130 Rev.0,-(see attachment 3).

4)

Welds and flange connections on NSMs MG-52128 Rev.0, (see attachment _4).

These modifications are being installed as part of'McGuire Nuclear Station's' continuing effort to improve the reliability and.

maintainability of, the Nuclear Service Water system. (See attachments 5-10 for flow diagrams.)

8.

Function:

The Nuclear Service Water system (RN) is a nuclear safety related, Class C system that.provides assured cooling water to various station heat exchangers during all phases of plant operation.

In conjunction with Lake Norman and the Standby Nuclear Service Water Pond, the RN system is designed to assure cooling for normal plant operation, and to provide cooling for safe shutdown normally, or as a result of a postulated Loss of Coolant Accident. The purpose of each NSM listed above is discussed below:

1)

NSM MG-12233 Rev. O and NSM MG-22233 Rev. O replace flow elements 1RNFE5370, 2RNFE5360, and 2RNFE5370 which provide flow indication for RN system to Component Cooling (KC) Heat Exchangers 18, 2A, and 2B respectively.

2)

NSM MG-12243 Rev. O and NSM MG_22243 Rev. O will replace valves 1RN-89A, 1RN-1908, 2RN-89A, and 2RN-190B which are 20 inch Fisher Butterfly valves used for flow regulation and isolation of RN system to KC Heat Exchangers.

3)

NSM MG-22130 Rev. O will replace expansion joints 2RN4A and 2RN4B which are used to minimize pump suction casing loading on RN Pumps 2A and 28 respectively.

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.0.S. Nuclear Regulatory Commission

' February 16,:1989

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Attachment Page 2 4)

NSM MG-52128 Rev. O will add piping and valves to allow RN system-s

. water to the Control Area HVAC/ Chilled Water system (VC/YC) chiller to.be discharged.to the common 36 inch RN header between Unit 1 and Unit 2.

This modification will aid RN. system work on Unit 1.

C.-

ASME III Code Class:

Equivalent Class 3 D.

Materials:

See attachmented drawings.

2.

ASME Code Section XI Requirement That Has Been Determined To Be Impractical:

ASME Boiler and Pressure Vessel Section XI, 1980 Edition through Winter 1980 addenda, Article IWA-4400 and Article IWD-5000 3.

Basis For Requesting Relief:

For the modifications' listed, we have determined that hydrostatic testing is hhpracticle due to inadequate. test boundries. The hydrostatic test boundary isolation valves include 36 inch, 20 inch, and 18 inch butterfly valves which have a history of. leakage. These valves do not offer adequate isolation to accomplish a hydrostatic test using conventional hydro equipment.

The RN system is a low pressure, low temperature system with a design pressure of no more than 135 PSIG and design temperature of no more than 150 degrees-F. Hydrostatic test pressure for the RN system is 110% of the design pressure or approximately 150 PSIG.

NSM MG-22130 Rev. O involves an additional concern of over-pressuriz Sg and damaging the bellows assembly of the expansion joints while attempting a hydr'o. The expansion joints have a design pressure of 35 PSIG.

Hydrostatic test pressure for this section of piping would be 38.5 PSIG. The alternate testing offers less chance of pressure damage to the bellows assembly because inservice inspection pressure at the expansion joints would be approximately 1 to 5 PSIG.

4.

Alternative Testing:

All welds will be subjected to a dye penetrant (PT) or a magnetic particle (MT) examination on the root pass and on the finished weld.

An in-service leak test will also be performed at normal system pressure.

I

d.S. Nuclear Regulatory Commission February 16, 1989 Attachment Page 3 5.

Why The Alternate Proposed Testing Will Provide An Acceptable Level Of Quality And Safety:

The ASME Code requires a dye penetrant (PT) or magnetic particle (MT) examination on the finished weld surface for greater than 4 inch NPS. We will have imposed an additional MT or PT on the root pass weld which will detect any defects in the root weld. The inservice leak inspection will verify the new flange connections do not leak.

It is our position that the alternate testing is comparable to hydrostatic testing for finding defects in the welds and mechanical flange connections.

6.

Implementation:

The following are the approximate dates for implementation of the modifications:

a)

NSM MG-12233 Rev. 0 - January 1, 1991 b)

NSM MG-22233 Rev. 0 - September 1, 1990 c)

NSM MG-12243 Rev. 0 - January 1, 1990 d)

NSM MG-22243 Rev. 0 - July 1, 1989 e)

NSM MG-22130 Rev. 0 - July 1, 1989 f)

NSM MG-52128 Rev. 0 - September 1, 1989 i

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