ML18219E114
| ML18219E114 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 02/27/1976 |
| From: | Tillinghast J Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co) |
| To: | Rusche B Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18219E114 (12) | |
Text
NRC FCiRhi 195 (2-76) 0 U.S. NUCLEAR REGULATORYCOMS'ION DOCKET NUMBER 50-31 NRC DISTRIBUTION FDR PART 50 DOCI<ET MATERIAL FILE NUMBER TO:
, MR B RUSCHE FROM:
INDIANA & MICHIGAN POWER CO NEW YORK, NY J TILLINGHAST DATE OF DOCUMENT 2 6 DATE RECEIVED 3 6 OLE TER R IGI MAL COPY DESCRIPTION OTOR IZED NC LASS IF I E D PROP INPUT FORM ENCLOSURE NUMBER OF COPIES RECEIVED P
1 LTR NOTORIZED 2-27-76.....ADVISING THEY ARE ATTEMPTING TO COMPLETE VALVE MODIFICATION AS SOON AS PRACTICAL..
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PLANT NAME:
COOK 81 p)g(g pz~~@PW'AFETY ASSIGNED AD:
BRANCH CHIEF:
FOR ACTION/INFORMATION ASSIGNED AD:
BRANCH CHIEF
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ENVIRO 3-9-76 rkb PROJECT MANAGER:
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SST PROJECT MANAGER
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KNXGHT SIHWEIL PAWLICKX REACTOR SAFETY ROSS NOVAK ROSZTOCZY RI BUT)ON IST BENAROYA IPPOLITO OPERATING REACTORS STELLO OPERATING TECH EISENHUT SHAO BAER SCHWENCER ERNST ALLARD SPANGLER SITE TECH GAMMILL STEPP HULMAN SITE ANALYSIS VOLltIER
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CHECK AT & X SALTZMAN RUTBERG EXTERNAL DISTR IBUTION NATL LAB
'EG, V-IE LA PDR CONSULTANTS GRIMES SITE SAFETY & ENV ANALYSIS DENTON & MULLER BROOKHAVEN NATL LAB ULRXKSON(ORNL)
KREGER CONTROL NUMBER 2008 NRC FORM 195 {2-76)
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INDIANA R MICHIGAN POWER COMPANY P. 0. BOX 18 BO WLI N G GREEN STAT ION NEW YORK, N. Y. 10004 February 27, 1976 Donald C.
Cook Nuclear Plant Unit No'. '1 Docket No. 50-315 DPR No.
58 Mr. Benard Rusche, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Nashington>
D C.
20555
Dear Mr. Rusche:
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In our letter to you dated December 15, 1975, we stated that we would submit descriptions of modifications to be made to the control circuits of the below listed valves and a test description to assure that power was off to the following valves as required by the NRC-1.
IMO 261 5.
ICM 306 2.
IMO 262 6.
IMO 390 3-IMO 263 7 ~
IMO 315 4.
ICM 305 8.
IMO 325 At that time, we were contemplating adding+.<,
another means of breaking power to the valve motor, in"'..
addition to the existing switch in the control circuit,",~, ;,.
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for the first five valves.
For the last three valves, we were going to break power to the valve motors locally at the motor control centers by manual action.
Ne have subsequently decided that, although somewhat more expensive,. it, would be better to make circuit changes to all eight valves, thereby eliminating the need to dispatch an operator to the motor control centers in the event that the last three valves had to be operated.
Attachment A describes the modifications to be made to the control circuits and to the valve testing procedure.
Also included in this attachment are two sketches which show the proposed new valve control circuitry logic.
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Benard Rusche February 27, 1976 We are now striving to be able to complete these modifications as soon as practical.
Zn the interim, as required by the NRC Staff in "Supplement No.
5 to the Safety Evaluation Report for Donall C.
Cook Nuclear Plant Unit 1", dated January
- 1976, pages g-8, the plant has proposed. revisions to several procedures to manually disconnect power to the valve motors for all eight valves at the motor control centers and to assign operators the specific responsibility to restore power to these valves in the event of an accident.
These procedure revisions are under review and shall be implemented by March 4, 1976.
Very truly yours, ohn Tillinghast Vice President JTemam Sworn and subscribed to before me this zv~ day of February, 1976 in New York County, New York Notary Public I
LAN BARRY:
ROTARY f'UftLtC, State of New )'ork cc:
G. Charnoff No. 41.4606792 Qualified in Queens County R.
C. Callen Cf,ttfffcete fifed in New York. County P.
W. Steketee ccnwussron c~pires March 30, tftgst R. Walsh R. J. Vollen R.
W. Jurgensen
- Bridgman R. S. Hunter
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ATTACHMENT A 0
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 pover to the valve position indication, thus allowing the continued visual in-dication of valve position on the control panel in the vicinity of the Master Control Switch.
The control pover lock out will be accompli. shed by inserting the contacts of a control svitch (one per valve) between the control transformer and the valve positioning cont ac tors.
In addition to the lock out switch, a supervisory light and alarm relay will be provided. to indicate availabili.ty of control power to the annunciator system.
Valve Testin Modification Testing of the valves in question will be revised to incorporate the folloving procedure for verifying the integrity of the control pover lock out device and supervisory equipment as well as the normal control equipment at the frequency prescribed in the plant technical specifications for the valve' operational testing.
Verification Procedure With the prerequisities for valve testing sat i,sfied, verify the following items:
1.
Control power lock out switch (8) is in the "off" position.
2.
Supervisory "white" light is extingui,shed.
3.
Control room annunciator for supervisory function is off.
The following steps will then be taken:
1.
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.
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2.
Restore the Master Control Switch to the neutral position and put the control power lock out switch for the valve to the "on" position and vaify the following:
A.
White supervisory lamp lights.
B.
Supervisory annunciator operates.
C.
Valve does not travel.
Put the Master Control Switch in the correct position, to operate the valve and verify that the valve travels to the selected position.
4.
Put the Master Control Switch in the neutral position and verify that the valve remains in desired position.
5.
Turn the control power lock out 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 va1ve 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 lock out switch in the "on" position.
Verify that the supervisory light and alarm indicate control power restored.
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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 and verify the following:
A.
Valve remains in desired position.
B.
Supervisory light is on.
C.
Supervisory alarm indicates control power on.
10.
Place control power lock out switch in the "off" position.
Verify the following:
A.
Supervisory light is extinguished.
B.
Supervisory alarm clears.
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