ML20206R513

Corrects Description of Low Temp Overpressure Protection Alarm Circuitry in 861115 Submittal.Valve Utilizes Contact on Limit Switch Rotor Internal to Valve Actuator for Valve Position Indication Instead of from Limit Switches

ML20206R513
Person / Time
Site:	Callaway
Issue date:	06/26/1986
From:	Schnell D UNION ELECTRIC CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
ULNRC-1336, NUDOCS 8607070167
Download: ML20206R513 (3)

Text

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1

-Umon

. Etscraic s

1901 Gratiot Street. St. Louis Donald F. Schnell Vice Rddent l

June 26, 1986 Mr. Harold R.

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

Dear Mr. Denton:

ULNRC -13 36 DOCKET NUMBER 50-483 CALLAWAY PLANT CALLAWAY LICENSE CONDITION C(12)

References:

1) ULNRC-1210, dated November 15, 1985

2) ULNRC-1306, dated May 1, 1986 This letter corrects a discrepancy in the description of the Low Temperature Overpressure Protection (LTOP) alarm circuitry as outlined in Reference 1.

The design described in Reference 1

provides new alarm circuits to valves BB-PV-8702A and EJ-HV-8701B such that if the interlock setpoint is reached and either valve is open an alarm will initiate on the main control board.

The referenced letter states that valve position for BB-PV-8702A and EJ-HV-8701B will be derived "directly from valve stem mounted limit switches".

However, the

design, which has been installed as indicated in Reference 2, utilizes a

contact on the limit switch rotor internal to the valve actuator for valve position indication.

This discrepancy does not change the function of the alarm circuitry as previously described.

Both sources of valve position indication are safety-related and environmentally qualified.

We apologize for any inconvenience caused by this discrepancy, which resulted from confusion in terminology.

If there are any questions relating to this please contact us.

70 g g gg80 3

Very trul

ours, V

Donald F.

Schnell DES /llb p8 c

Mailing Address: P.O. Box 149, St. Louis, MO 63166 j

STATE OF MISSOURI )

)

SS CITY OF ST. LOUIS )

9 Donald F.

Schnell, of lawful age, being first duly sworn upon oath says that he is Vice President-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.

By Donald F. S'chnell Vice President Nuclear SUBSCRIBED and sworn to before me this d7 day of

,t w, 198b.

v/AIRD h

BARBARA [PFAFF b NOTARY PUBUC, STATE OF MISSOURI MY COMMISS!ON EXP!RES APRIL 22, 1983 ST. LOUIS COUNTY

(

cc:

Gerald Charnoff, Esq.

Shaw, Pittman, Potts & Trowbridge 1800 M.

Street, N.W.-

Washington, D.C.

20036 Nicholas A.-Petrick Executive Director SNUPPS

5. Choke Cherry Road Rockville, Maryland-20850 C. W. Hehl 4

l Division of Projects and Resident Programs, Chief, Section lA U.S. Nuclear Regulatory Commission Region.III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Bruce Little Callaway Resident Office U.S. Nuclear Regulatory Commission RR$1 Steedman, Missouri 65077 Paul O'Connor Office of Nuclear Reactor Regulation i

U.S. Nuclear Regulatory Commission Mail Stop 316 7920 Nor folk Avenue l

Bethes'da, MD 20014 i

Manager, Electric Department-l Missouri Public Service Commission i

P.O. Box 360 Jefferson City, MO 65102

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