ML20028D911

Forwards Addl Info Re Protective Sleeves for LPRMs Per NRC 830111 Ltr & 830104 Telcon

ML20028D911
Person / Time
Site:	Grand Gulf
Issue date:	01/18/1983
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
AECM-83-32, NUDOCS 8301200079
Download: ML20028D911 (8)

Text

• MISSISSIPPI POWER & LIGHT COMPANY

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kBMAEddB Helping Build Mississippi P. O. B OX 164 0, J AC K S O N, MIS SIS SIP PI 3 92 0 5 January 18, 1983 NUCLEAR PRODUCDON DEPARTMENT U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C. 20555 Attention: Mr.11arold R. Denton, Di? ector

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416 and 50-417 License No NPF-13 File 0260/15180 Reference AECM-82/626 AECM-83/012 Request for Additional Information - Protective Sleeves for LPRMs AECM-83/32 Attached are the Mississippi Power & Light Company (MP&L) responses to NRC review questions requested by your Staff in a letter dated January 11, 1983, and conversations held with Dean Houston of your staff on January 4, 1982. This letter supplements information transmitted by the proposed change to the Operating License (PCOL-82/13) dated December 22, 1982.

If you have any further questions, please advise.

i Yomys t;ruly, 1 f) ~

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1 o h 8301200D77 f /~t.F.Manager Dale of Nuclear Services J0F/SilH/JDR: sap Attachment cc: Mr. N. L. Stampicy (w/o) Mr. T. B. Conner (w/o)

Mr. R. B. McGehee (w/o) Mr. G. B. Taylor (w/o)

Mr. Richard C. DeYoung, Director (w/a) l' Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. J. P. O'Reilly, Regional Administrator (w/a)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Cormission l

j Region II hg g 101 Marietta St., N.W., Suite 3100 1 Atlanta, Georgia 30303 I l

Member Middle South Utilities System

Attachm:nt 1 AECM-83/32

1. Concern What materials are involved? Is proposed sleeve material compatible with existing material at attachment point?

Response

The protective sleeve is constructed of 304 stainless steel. Both the sleeve material and the LPRM at the point of attachment are 304 stainless steel.

2. Concern Provide drawings which present the hardware to be installed and location of attachment pef,nts.

Response

i The drawings showing the sleeve details and the LPRM at the point of attachment are listed below, and are provided as attached figures.

Figure 1. Added sleeve - 188C7584, Tube Figire 2. Installation drawing - 188C7583, Plunger Figure 3. Point of attachment (ASM) - 262A7418, Spring Housing Figure 4. Point of attachment (detail) - 262A7417, Tube

3. Concern Provide procedure for installation or summary of procedure.

Response

General Electric Field Disposition Instruction WAWD will be utilized with

] a controlling temporary directive for establishing and maintaining the necessary plant conditions. A summary of the work procedure is as follows:

The reactor water level will be lowered to 18 inches below the top guide. One fuel bundle adjacent to the BEI on which the work is to be performed will be removed. The BEI plunger will be depressed so that the top end of the BEI can be removed from the top guide and moved into the open space from which the fuel bundle was removed.

The protective sleeve will be installed over the plunger and seated solidly against the existing shoulder on the BEI, At this time, the tack welder is installed over the LPRM tube; four small tack welds, approximately 1/8 inch in diameter, are placed at 90* intervals between LPRM and top of sleeve modifications. Test specimens show that the four tack welds provide a minimum strength of 800 pounds.

4. Concern Is welding involved? If so, has impact to adjacent channel boxes been evaluated (from radiant heat damage)? Has the possibility of a zircalloy fire been considered? Does this present a hazard?

I _

Attachmint 1 AECM-83/32

Response

The sleeves are attached to the LPRM by four tack welds made by the TIG welding process. The tacks are low amperage welds as shown by the power requirements summarized below:

a. 45 amps high pulse for 0.1 seconds

b. 25 amps low pulse for 0.9 seconds

c. slope from 25 amps to 0 amps in 1 second The power sequence is automatically controlled by a programmable power

supply. The stainless steel weld fixture, designed specifically for this application, provides the weld torch alignment feature and totally encloses the LPRM in the area of the weld. With this arrangement, the zircalloy channels are not exposed to an open arc, and the heat conducted to the adjacent channels is negligible and without hazard.

5. Concern Will fuel movement be involved and to what extent?

Response

Forty-four (44) fuel bundles will be removed and stored in the in-containment storage racks until the sleeve installation is complete.

This is one bundle per LPRM, and the movement will be controlled by a fuel movement plan prepared by the plant reactor engineering staff.

6. Concern Does sleeve installation prevent the withdrawal of LPRM from the bottom of the RPV?

Response

The sleeve is attached to the bottom entry incore external housing and will have no effect on withdrawal of the LPRM if required.

7. Concern Does the installation method, whether welding or mechanical attachment, impact the pressure boundary, i.e., potential damage to TIP tube?

Response

The TIP tube pressure boundary will remain intact. The procedure for installation has been prepared to ensure the pressure boundary is not impacted. The potential for damage to the TIP tube is very remote since

.the TIP tube is in the center of the LPRM tube.

,_ _ .- . - . , _ -_ y -. ,_m , . _,-

Attechrent 1

-AECM-83/32

8. Concern Has the installation procedure been checked out by a GE mock up, etc?

What testing has CE or MP&I. conducted to insure that the installation method will be permanent and successful?

Response

The welding procedure and fixture have been thoroughly tested at General Electric - San Jose. Mock up pieces were welded together and pull tested to failure. The test showed the equipment performed with consistency and the parts could withstand loads greater than 800 pounds. This is far in excess of any loads acting on the sleeve. The_ test report and weld qualification records are contained in the General Electric design record file.

9. Concern Does the installation procedure include a radiological assessment of radiation levels in the work area (prior to personnel initial entry into the top guide area)?

Response

The temporary directive for controlling plant-conditions during the LPRM sleeve replacement will be reviewed by the plant ALARA committee prior to implementation. Similarly, all work will follow existing plant procedures for radiological work and will be controlled using a-Radiation Work Pernit.

10. Concern What steps will be taken to prevent the falling of debris into the core and vessel area?

Response

A tight fitting seal will be placed over the LPRM tube and provide a positive boundary for containing any debris. In addition, precautions will be taken to control all tools used in the vessel and limit loose parts and other items brought into the work area.

11. Concern What training is planned for the maintenance personnel to accomplish this one time activity?

Response

Personnel involved in the slceve installation will be qualified by performing the actual evolution on first a full scale mock up and then by actually installing a sleeve on a spare LPRM tube prior to any in- vessel work.

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