ML20010H997

Proposed Tech Spec 2.2,correcting Setpoint Associated W/ Reactor Trip Initiated by Turbine Trip

ML20010H997
Person / Time
Site:	McGuire
Issue date:	09/21/1981
From:	DUKE POWER CO.
To:
Shared Package
ML20010H995	List: ML20010H994 ML20010H997
References
TAC-46812, NUDOCS 8109290484
Download: ML20010H997 (1)

Text

F Technical Specification 2.2 - Reactor Trip Instrumentation Setpoints Proposed Change Change Values on Item 12B in Table 2.2-1 to read:

12A) Low System Pressure Trip - Trip Setpoint > 45 psig Allowable Value > 42 psig Justification an.d Safety Analysis The design of the Turbine Trip / Reactor Trip circuit is based on the control oil system which is used to control DEH system oil pressure through an interface valve. When a turbine trip signal is initiated, a section of the control oil system is bled off which in turn dumps the pressure on the DEH system to close the turbine control and stop valees.

This control oil system generates a low pressure signal at 45 psig through 2 out of 3 logic to trip the reactor above the P-8 setpoint.

The DEH low pressure trip at 900 psig serves to close the turbine control and stop valves which in turn would trip the reactor through the turbine stop valve closure switch at 1% open.

However, the DEH system low pressure trip does not directly feed the reactor trip circuit.

Therefore, the setpoint specified should be for the control oil pressure switches which dir-ectly initiate the reactor ^ trip.

This proposed change corrects the current Technical Specifications to correctly specify the trip setpoint and as such does not result in any adverse safety im-plications.

8109290484 810921 PDR ADOCK 05000369 P

PDR.