ML20203C637

Responds to 860416 Request for Addl Info Re Planned Elimination of Upper Head Injection Sys.Containment Penetration Capping Will Be Performed Per Applicable Codes & Stds & Design Requirements

ML20203C637
Person / Time
Site:	McGuire, Mcguire
Issue date:	04/17/1986
From:	Tucker H DUKE POWER CO.
To:	Harold Denton, Youngblood B Office of Nuclear Reactor Regulation
References
TAC-57211, TAC-57212, NUDOCS 8604210205
Download: ML20203C637 (2)

Text

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(704) at:t-4n:38 wousas reawcwn April 17, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commissica Washington, D.C.

20555 Attention:lt.'fJ' _ Youndlood',I Director PWR Project Directorate #4

Subject:

McGuire Nuclear Station Docket Nos. 50-369, -370

Dear Mr. Youngblood:

In a telephone call on April 16, 1986, the NRC requested additional information relative to the planned elimination of the Upper Head Injection System from the McGuire Nuclear Station.

This sJdltional information is attached.

Very truly yours, s hl-

/d g

Hal B. Tucker, ice President Nuclear Production Department WDR/gbh Attachment cc:

Mr. Darl Hood, Project Manager Division of Licensing Office of Nuclear Regulatory Commission Washington, D.C.

20555 W. T. Orders NRC Resident Inspector McGuire Nuclear Station Dr. J. Nelson Crace U. S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, CA 30323 lh 9604210205 860417 PDR ADOCK 05000369 P

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Duke Power Company McGuire Nuclear Station Additional Information Related to UHI Removal The planned operation of the McGuire Nuclear Station without the Upper Head Injection System operable may be divided into two phases. The first phase involves operation with the UHI System in place hut functionally disabled by closure of the existing UHI isolation valves. The plant modifications required for this mode of operation were described in Duke's December 17, 1985 transmittal.

The second phase involves the physical removal of UHI piping and components, cutting and capping the penetrations to the vessel upper head, capping containment penetrations, and capping miscellaneous piping interfaces with other plant systems.

The vessel upper head penetration cap has been designed and manufactured in accordance with ASME Section III (Class 1) (latest Edition and Addenda) requirements.

Installation of the cap will be performed in occordance with ASME Section IX and XI requirements, approved plant procedures, and other i

applicable codes and standards. The capped vessel upper head penetrations will undergo NDE and hydrostatic testing in accordance with the require-ments of ASME Section XI, approved plant procedures, and other applicable codes and standards.

Two of the three UHI related containment penetrations are currently planned l

to be capped when the system is physically removed. The containment pene-tration capping will be performed in accordance with applicable codes and standards (including ASME Section III (Class 2)) and design requirements.

The third penetration will be used as the post nccident liquid sampling return line penetration. Testing of containmen' penetrations will be per-formed in accordance with applicable codes, standards, and approved plant procedures in order to ensure the required containment integrity.

UH1 interfaces with other systems consist of various grades of piping, Capping of the interface piping will be performed in accordance with i

applicable codes, standards, and prudent design practices.

Parts of the UHI System located in the Auxiliary Building may remain in place indefinitely. Any component which is not physically removed will be evaluated from mechanical and civil engineering perspectives to ensure l

the component does not introduce risk to or interfere with other plant systems. The evaluations include seismic and structural analyses and will l

ensure McGuire Nuclear Station continues to satisfy applicabic codes, standards, regulatory requirements, and design criteria, l

The safety analyses performed are applicable for either mode of operation, i

UHI isolated or UHI physically removed.

The isolation of UHI has been discussed in previous Duke transmittals to the NRC. The physical removal i

of UHI includes design, execution of modifications, and subsequent testing in accordance with applicable codes and standards, approved plant pro-cedures, regulatory requirements, and good engineering practice.

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