ML20084C574

Forwards Relief Request 95-02 from Requirements to Perform Visual Exam for One of Two RCS Pressurizer Spray Valves

ML20084C574
Person / Time
Site:	Catawba
Issue date:	05/16/1995
From:	Rehn D DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9505310541
Download: ML20084C574 (7)

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• Catawba Nuclear Generation Department Mcel>esident 4800 ConcordRoad (803)&113205 Othce York.SC29745 (803)8313426 Fat DUKEPOWER May 16,1995 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555

Subject:

Catawba Nuclear Station, Unit 2 Docket No. 50-414 Request for Relief Serial Number 95-02 Gentlemen:

,' Pursuant to 10CFR50.55a(g)(5)(iii), please find attached Request for Relief 95-02. The purpose of this relief request is to seek relief from the requirement to perform 'a visual examination (VT-3) for one of two reactor coolant system (NC) pressurizer spray valves, one of four residual heat removal system (ND) pump suction isolation valves, and one of four cold leg accumulator (NI) discharge isolation valves.

The basis for this relief request is contained in the attachment. Catawba requests a timely review of this relief request, as these valves are scheduled to be examined during the Unit 2 end-of-cycle 7 refueling outage scheduled to begin on September 25,1995.

Accordingly, Catawba is requesting NRC approval of this request by September 1,1995.

Should you have any questions concerning this relief reqdest, please call L.J. Rudy at (803) 831-3084.

Very truly y ur D.L. Rehn LJIUs Attachment 9505310541 950516 PDR ADDCK 05000414 j P PDR f D

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1 Document Control Desk Page 2 May 16,1995 xc (with attachment):

S.D. Ebneter, Regional Administrator Region 11 R.J. Freudenberger, Senior Resident inspector R.E. Martin, Senior Project Manager ONRR

4 Document Control Desk Page 3 May 16,1995

- bxc (with attachment):

Z.L. Taylor L.J. Rudy J.E. Cherry Document Control File 801.01 Group File 801.01 ELL-EC050 NCMPA-1 NCEMC PMPA SREC l

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DUKE POWER COMPANY ,

STATION CATAWBA UNIT 2 10-YEAR INTERVAL REQUEST FOR RELIEF NO. 95-02 I. System / Component (s) for Which Relief is Requested:

ASME Section XI Code Class:1 Examination Category: B-M-2 Valves - Reactor Coolant System (NC) - Valve Body Internal Surfaces Weld Numbers Item Numbers 2NC-27 B12.050.002A 2NC-29 B12.050.002B ASME Section XI Code Class:1 Examination Category: B-M-2 Valves - Residual Heat Removal System (ND) - Valve Body Internal Surfaces ,

Weld Numbers Item Numbers 2ND-1B B12.050.003A 2ND-2A B12.050.003B 2ND-36B B12.050.003C 2ND-37A B12.050.003D ASME Section XI Code Class:1 '

Examination Category: B-M-2 Valves - Safety Injection System (NI) - Valve Body Internal Surfaces Weld Numbers Item Numbers 2NI-54A B12.050.004A 2NI-65B B12.050.004B l 2NI-76A B12.050.004C l 2NI-88B B12.050.004D 1 l

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II. Code Requirement: l ASME Section XI, Examination Category B-M-2, Pressure l Retaining Welds In Pump Casings And Valve Bodies, Table IWB-2500-1, Item No. B12.50 requires a Visual, VT-3 Examination of Valve Body Internal Surfaces, exceeding 4 inch nominal pipe size. Examinations are limited to one valve within each group of valves that are of the same constructional design, manufacturing method, and that perform similar functions in the system.

III. Code Requirement from which Relief is Requested: ~

Reliefis requested from performing the Code-required Visual, VT-3 Examination on one of the valves, in each group of valves ,

identified above.

IV. Basis for Relief:

Since the Code allows deferral of this examination to the end of the interval, each group of valves was scheduled i for examination during the First Ten Year Inspection Interval so that the Visual, VT3 Examination could be performed in conjunction with a scheduled maintenance activity where disassembly of a valve body in each group was required. The valves in the three groups from which relief from the Visual, VT3 Examination is requested have not been disassembled during the First l

Ten Year Inspection Interval for a scheduled maintenance activity. These valves, which are located in a high radiation area, are functioning properly and there is no operating history of any significant problems which would warrant concern. There are no current plans to disassemble any of the valves in these three groups. i V. Alternate Examinations or Testing:  ;

No alternate examinations are proposed to be performed on these valve bodies during the First Ten Year Inspection Interval. i

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. VI. Justification for the Granting of Relief: ,

This request for relief is based on the requirements of '

the 1989 Edition of ASME Section XI, which is the latest i

edition of the Code adopted by 10 CFR 50.55a(b)(2). The 1989 Edition of ASME Section XI, Table IWB-2500-1, Examination Category B-M-2, Valve Bodies, Exceeding NPS 4, Note 2, states that examinations are required only 1 when a valve is disassembled for maintenance, repair, or volumetric examination. Duke Power Company feels that the words in the 1989 Edition clarify the examination requirements intended in the 1980 Edition of ASME Section XI. During the Second Ten Year Inspection  :

Interval, these examinations shall be scheduled to be performed each time disassembly of a valve body in these three groups is required during a normal maintenance activity.

Although the examination requirements of ASME Section XI,1980 Edition including W81 Addenda, could not be met for the First Ten Year Inspection Interval, it is Duke Power Company's opinion that this will not endanger the health and safety of the general public. The past operating history and performance of these valves has revealed no significant problems. In addition, each valve ,

receives a Visual Examination, VT-2 on the external surfaces during each refueling outage. This examination is performed during normal plant start-up and is used to verify valve integrity and to insure there is no leakage.

A similar Request For Relief, Serial No. 94-03, has been granted for Catawba Unit 1. (Reference NRC acceptance letter dated February 16,1995 - TAC No. M91175.)

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4 VII. Implementation Schedule:

These examinations will be scheduled to be performed during the Second Ten Year Inspection Interval each time these valve bodies are disassembled for maintenance, repair, or volumetric examination.

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Reviewed By: t Date 1$

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