ML18219D983

11/23/1976 Letter Modifications to Control Circuits for Valves

ML18219D983
Person / Time
Site:	Cook
Issue date:	11/23/1976
From:	Tillinghast J Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	Rusche B Office of Nuclear Reactor Regulation
References
Download: ML18219D983 (18)

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INDIANA 5 MICHIGAN POWER COMPANY P. O. BOX 18 BO WL IN G G R E EN STAT ION NEW YORK, N. Yp 10004

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November 23, 1976

~od Gg Donald C. Cook Nucle an 1OgggA

, Docket No. 50-315 Qf5LQ DPR No. 58

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Mr. Benard Rusche, Director If'o~

Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Rusche:

In our letter to you of February 27, 1976, we described certain modifications that we proposed, in answer to NRC requirements, to the control circuits for the valves identified in that letter. We also described1 revisions to the testing procedures for these valves.

Attachment A to that letter described the control circuit modifications and the testing procedures. In the period required to make these changes, we took temporary measures that were acceptable to the NRC Staff as indicated in Supplement No. 5 of the Safety Evaluation Report for Unit 1 (January 1976) .

Recently, the NRC Staff has, through telephone discussions with us, required us to make revisions to our proposed control circuit modifications and to>the verification procedures. In accordance with the new NRC Staff requirements, we submit Attachments'A to this letter which describes the revised circuitry and verification procedures. We have been informed that these are acceptable to the NRC Staff.

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Mr. B. C. Rusche November '23, 1976 The original modifications are in the pxocess of being implemented at the Plant.",and we will add these latest revisions in our work.

Very truly yours, n Tilli ghast Vice president JT:mam Sworn and subscribed to befoxe me on this ~> day of November 1976 in~New York County, New York Notary public iHLEf >g 11~~g NOTARY rUftt.tC, Steto of Ncw York No. 41-4606792 Quctified in Queens County Certificate filed in Ncw York County C.ommrssron Expires t.trsrch 30, i9P'7 CC G. Charnoff P. W. Steketee R. C. Callen R. J. Vollen R. Walsh R. W. Jurgensen Bridgman R. S. Hunter

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ATTACHMENT A

DONALD C. COOK NUCLEAR PLANT UNIT 1 Control Modification The control to the valves in question will be modified to provide a means of locking out control power independent of the normal valve control equipment and master control switch.

The action of locking out the control power will remove power from the valve contactor coils and associated limit, seal in and torque switch circuits, but not remove power to the valve position indication, thus allowing the continued visual indication of valve position on the control panel in the vicinity of the Master Control Switch.

The control power lockout will be accomplished by inserting the contacts of a control switch (one per valve) between the control transformer and the valve positioning contactors.

In addition to the lockout switch, a key-lock assembly will be provided on all master control switches (101),

a set of supervisory lamps will be provided across the master control switch contacts in the starter circuit for the

'irection of concern for spurious valve travel, and a supervisory light and alarm relay will be provided to indicate availability of control power and to alarm the annunciator system. Surveillance testing for the subject valves will follow the following procedures: Item I for outage surveillance where the valve may be repositioned, and II for in-service surveillance where the valve control circuit must be verified but the valve must not be repositioned.

I. Verification Procedure testing satisfied, verify the following items:

A. Control power lockout switch (8) is in the "off" position.

B. Supervisory "white" light for valve control bus is extinguished.

~ I C. Supervisory "clear" lights for control switch (101) contact surveillance are extinguished.

D. Control room annunciator for supervisory function is off.

Procedure:

Unlock and hold the Master Control Switch (101) for the valve in the correct position to operate the valve and verify that the valve does not travel.

2. Restore the Master Control Switch to the neutral-position and put the control power lockout switch for the valve to the "on" position and verify the following:

A., White supervisor lamp lights.

B. Clear control switch supervisory lamps light.

C. Supervisory annunciator operates.

D. Valve does not travel.

3. Put the Master Control Switch in the correct position, to operate the valve and verify that the valve travels to the selected position. Verify that during the time the valve is in travel, the clear supervisory lamps are out and that they remain out at the end of travel.

4~ Put the Master Control Switch in the neutral position and, verify that the valve remains in desired position.

5. Turn the control power lockout switch to "off" and verify that the supervisory light and alarm indicate control power disconnected.

6. Hold the Master Control Switch in the correct position to return the valve to its original position and verify that the valve does not travel.

7. Return the Master Control Switch to the neutral position and place the control power lockout

-switch in the "on" position. Verify that the

-supervisory white light and alarm indicate control power restored.

8; Put the Master Control Switch in the correct

. -position to return the valve. Verify that the

-valve travels to the selected position.

9. Place Master Control Switch in the neutral position,

lock and verify the following:

=A. Valve remains in desired position.

=B'; Supervisory white light is on.

C. Supervisory "clear" lights are on.

D. Supervisory alarm indicates control power on.

-E. Control switch cannot be operated.

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Place control power lock out .switch in the "off" position. Verify the following:

A. Supervisory white light is extinguished.

B. Super'visory clear lights axe extinguished.

C. Supervisory alarm. clears.

. IX. Verification Procedure.

-Prere uisites: With the prerequisites for control switch contact surveillance'testing satisfied, verify the following items:

-A. Control Power lockout switch (8) is in the "off" position.

B. Supervisory "white" light for valve control bus in extinguished.

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C. Supervisory "clear" light for control switch (101) contact surveillance extinguished.

D. Control room annunciator for supervisory function is off.

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Place on..the- control power lockout switch (8) in the. on position and verify the following,.--

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Supervisory alarm sounds in the control room indicating valve- is, not locked out.

%AC t*W v ~ w<<r B=...Surveillance lamps for- 101 switch contacts (two) light indicating contacts are open.

C -. Control-bus supply- surveillance lamp lights indicating the control bus to normal valve control.-,circuits is=-energized.

Return-.the-control lockout switch (8) to the normal position -(on) and veri'that:

A. Alarm clears.

B, All three. indicating lamps-are extinguished.

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