ML20009C887

Application for Amend of License NPF-3,revising Tech Specs for Auxiliary Feedwater Pump Turbine Speed Switches,Setpoint Index for Pressurizer Electromatic Relief & Code Safety Valves,Emergency Diesel Generator & Administrative Errors

ML20009C887
Person / Time
Site:	Davis Besse
Issue date:	07/10/1981
From:	Crouse R TOLEDO EDISON CO.
To:
Shared Package
ML20009C886	List: ML20009C884 ML20009C887 ML20009C888
References
TAC-43333, TAC-46676, TAC-46677, TAC-51387, TAC-52156, TAC-54259, NUDOCS 8107220102
Download: ML20009C887 (3)

Text

. v APPLICATION FOR AMENDMENT TO FACILITY OPERATING LICENSE NO. NPF-3 FOR DAVIS-BESSE NUCLEAR POWER STATION UNIT NO. 1 Enclosed are forty-three (43) copies of the requested changes to the Davis-Besse Nuclear Power Station Unit No. 1 Facility Operating License No. NPF-3, together with the Safety Evaluation for the requested change.

The proposed changes include:

1. Changes in Section ?../.1.2.d; (Auxiliary Feedwater Pump Turbine Speed Switches)

2. Changes in Sections 3.4.2, 3.4.3, 4.4.3 and Bases; (Setpoint Index for Pressurizer Electromatic Relief and Code Safety Valves)

3. Changes in Sections 4.8.1.1.2.C.2 and 4.8.1.2;.(Emergency Diesel Generator)

4. Changes in Sectio,ns 3.1.3.6, 3.2.1, 3.2.5 and Figure 3.1-3a; (Administrative Errors and Safety Evaluation)

. 5. Changes in Section 6.5.2.2, Figures 6.2-1 and Figure 6.2-2 and (Reorganization at Toledo Edison)

6. Changes in Section 3.7.10 (Fire Barrier Penetration)

By R. P. Crouse Vice President, Nuclear Sworn and subscribed before me this 10th day of July, 1981.

C. .

// Notary Fublic PW l.AURIE A. BRUDZINSKI Notary Public. State of Ohio

- My Cc::. mission Expires May 16.1986 i

( 8107220102 810710 '

PDR ADOCK P 05000346l pyg

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I .

Docket No. 50-346 License No. NPF-3 Serial No. 731 July 10, 1981 Attachment 1 I. Change to Davis-Besse Nuclear Power Station Unit 1, Appendix A Technical Specifications 4.7.1.2.d concerning Auxiliary Feed Pumps Turbine Speed Switches.

A. Time required to Implement This change is to be effective upon NRC approval B. Reason for Change (Facility Change Request 81-140)

To improve the reliability of the auxiliary feedwater system by reducing the number of valves which are required to open automatically on SFRCS actuation C. Safety Evaluation See attached E

1

. l Safety Evaluation This request is to delete the interlocks from the Auxiliary Feed Pump Turbine (AFPT) speed switches to valver HV-360 and HV-388 and change Tech. Spec. 4.7.1.2.d.

The only safety function of this AFPT speed switch is to prevent over-filling the steam generator with auxiliary feedwater when AFPT is running at minimum speed. This condition can only occur when the steam generator pressure is low.

There are two identical auxiliary feedwater trains in the system with three normally closed motor operated valves (two auxiliary feedwater pump outlet valves and one auxiliary feed pump turbine inlet valve) in each train that have to open to provide auxiliary feedwater to the steam generators after a SFRCS actuation. In train 1, the AFPT speed switch opens valve HV-360 (HV-388 in train 2) at AFPT speed 2800 RPM and closes the valve if the speed is 1100 RPM (the AFPT speed is dependent on steam pressure delivered to the turbine inlet valve from the steam generator). By deleting the interlocks to the AFPT speed switches, valves HV-360 and HV-388 can be left in the open position and the relia-bility of the Auxiliary Feedwater System is improved because it reduces the number of motor operated valves which have to be opened automatically on SFRCS actuation. The overfilling of the steam generator is still prevented at low steam pressure by the manual closing of valves HV-360 and HV-388. There is only a very remote possibility that the auxiliary feedwater system will be used for decay heat removal with low pressure conditions in the steam generator (causing the running of turbine at low speeds). Even in this event, tne duration of time within which the AFPT speed will get to the minimum speed provides more than adequate time for the operator to close valves HV-360 or HV-388 if needed.

Reliability of the Auxiliary Feedwater System is also improved by provid-ing locks on handwheels and local pushbutton stations for valves HV-360 and HV-388 so these valves cannot be inadvertently closed from outside-the control room.

Since the speed switch interlocks are being deleted from these motor operated valves (HV-360 and HV-388), and also since these speed switches do not perform any other safety function, the Channel Functional Test and Channel Calibration on these speed switches in Tech. Spec. 4.7.1.2.d can be deleted. The above safety evaluation also applies to the change in Tech. Spec.

These changes do not create a safety question, therefore, this is not an unreviewed safety related issue.

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