ULNRC-05259, Response to Request for Additional Information Re License Amendment Request (LAR) OL-1262 for Revision of Technical Specification 3.7.2, Main Steam Isolation Valves (Msivs)

Response to Request for Additional Information Re License Amendment Request (LAR) OL-1262 for Revision of Technical Specification 3.7.2, Main Steam Isolation Valves (Msivs)

ML060860220
Person / Time
Site:	Callaway
Issue date:	03/09/2006
From:	Keith Young AmerenUE
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-05259
Download: ML060860220 (11)

Text

AmerenUE CallawayPlant PO Box 6'0 Fulton, MO 65251 March 9, 2006 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-137 Washington, D.C. 20555-0001 g"ameren UE Ladies and Gentlemen:

ULNRC-05259 DOCKET NUMBER 50-483 CALLAWAY PLANT UNION ELECTRIC COMPANY RESPONSE TO REQUESTS FOR ADDITIONAL INFORMATION LICENSE AMENDMENT REQUEST (LAR) OL-1262 FOR REVISION OF TECHNICAL SPECIFICATION 3.7.2, "MAIN STEAM ISOLATION VALVES (MSIVs)"

Reference:

ULNRC-05150, dated May 26, 2005 The referenced letter (ULNRC-05150) transmitted to the NRC AmerenUE'3 (Union Electric) requested amendment of the Facility Operating License for the Callaway Plant (License No. NPF-30) to revise Technical Specification (TS) 3.7.2.

"Main Steam Isolation Valves (MSIVs)." The primary changes proposed per the amendment request would add requirements for the MSIV actuator trains to TS 3.7.2.

As requested by the NRC, the attachment to this letter provides excerpts from the maintenance manual (M-628-00049), drawings, and slides from Operator training materials. This information provides design and operational details of the MSIVs including their associated actuator trains and relevant components.

In providing this additional information, the determination pursuant to 10 CFR 50.92 that the proposed license amendment request does not involve a significant hazard consideration, including the basis for that determination, remains unchanged.

ao eDo a subsidiary of Ameren Corporation

ULNRC-05259 March 9, 2006 Page 2 Please contact us for any questions you may have regarding this transmittal of additional information.

I declare under penalty of perjury that the foregoing is true and correct.

Very truly yours, Executed on: March 9, 2006 Keith D. R uo Aang Manager, Regulatory Affairs DJW/jdg

Attachment:

Information Providing Details of the MSIVs With Both Actuator Trains and Relevant Components r

ULNRC-05259 March 9, 2006 Page 3 cc:

U.S. Nuclear Regulatory Commission (Original and 1 copy)

Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 Mr. Bruce S. Mallett Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Jack N. Donohew (2 copies)

Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O-7D1 Washington, DC 20555-2738 Missouri Public Service Commission Governor Office Building 200 Madison Street PO Box 360 Jefferson City, MO 65102-0360 Deputy Director Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102

Attachment ULNRC-05259 ULNRC-05259 (REGARDING LAR OL-1262)

ATTACHMENT INFORMATION PROVIDING DETAILS OF MSIVs WITH BOTH ACTUATOR TRAINS AND RELEVANT COMPONENTS

1. Excerpts from Maintenance Manual, M-628-00049 (3 pages)

2. Drawing M-628-00019 (1 page)

3. Photo of MSIV and equipment (1 page)

4. MSIV Overall Details (Slide from Operator Training Materials) (1 page)

5. MSIV Fast Close Details (Slide from Operator Training Materials) (1 page)

0 C.

ACTUATOR DATA

1.

Principles of Operation The primary function of the A/DV hydraulic actuator is the rapid closure of the isolation valve.

It accomplishes this action by releasing high pressure hydraulic fluid onto the top of a piston attached to the valve stem. The energy required to drive the valve closed is stored in a fixed volume of high pressure nitrogen contained within a hydraulic accumulator.

The volume and pressure of the nitrogen is established by the work required to drive the valve closed. The volume of the hydraulic fluid is established by the swept volume of the valve driving piston as it travels from full open to full closed.

Together, these volumes form the basis for the sizing of the accumulator.

The air/oil pump is provided primarily to maintain hydraulic fluid pressure. It also serves to drive the valve stem for certain modes of operation.

The pump is a balanced piston type.

The air pressure acting over the large area of the air piston is normally balanced by the hydraulic pressure acting over the much smaller area of the pump piston.

Should the hydraulic pressure decrease,the air piston forces the hydraulic pump piston to discharge into the system.

Air control valves cause the pistons to reciprocate as long as the pump is out of balance.

A pressure switch on the accumulator warns of a possible loss of either nitrogen or hydraulic fluid which could render that redundant side inoperable.

If a nitrogen leak develops, the accumulator piston will move in the direction of the piston 27 4

M-4zg ~.oooLq C. ACTUATOR DATA (continued)

1. Principles of Operation (continued) stop.

The air/oil pump will maintain hydraulic pressure.

Eventually the piston could reach the stop and nitrogen pressure will decrease. If the pressure has fallen to a point at which the valve could not be closed in the required time with that side of the actuator, the pressure switch activates.

Should a hydraulic leak develop that exceeds pump capacity or should the air/oil pump fail to operate, then the hydraulic pressure will decrease. As hydraulic pressure decreases, the accumulator piston moves in a direction opposite to the piston stop and the nitrogen expands.

Eventaully the piston will reach a point where either nitrogen pressure in that side of the actuator is too low to close the valve in the required time or insufficient hydraulic fluid is contained within the accumulator in that side of the actuator to drive the valve through its stroke.

The pressure switch set point chosen is the highest pressure of the above failure modes.

NOTE: A loss of pressure in one of the accumulators does not affqct the accumulator pressure in the redundant train.

2.

Startup Information This section describes the preparation of the actuator for operation.

The following should be initiated after the valve is installed in the line:

a.

Electrical Connections The electrical components of the hydraulic actuator; solenoid valves and pressure switches are wired to two (2) 28

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10/26/2005

MSIV FAST CLOSE

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Page 30 CcU-