ML20247R624

Proposed Tech Spec 3/4.3-8, Turbine Overspeed Protection Sys

ML20247R624
Person / Time
Site:	Fermi
Issue date:	07/24/1989
From:	DETROIT EDISON CO.
To:
Shared Package
ML20247R615	List: ML20247R624 NRC-89-0108, Application for Amend to License NPF-43,modifying Tech Spec 3/4.3.8, Turbine Overspeed Protection Sys, to Better Specify Requirements for Sys
References
NUDOCS 8908080070
Download: ML20247R624 (4)

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PROPOSED PAGE CFJ0GES 8908080070 890724 :

PDR ADOCK 05000341' P PNV

INSTRUMENTATION i 3/4.3.8 TURBINE OVERSPEED PR0_TECTION SYSTEM LIMITING CONDITION FOR OPERATION 1

. 3. 8 At least one turbine overspeed protection system shall be OPERABLE. I sufy//ed APPLICABILITY: OPERATIONAL CONDITIONS 1 and 2, uA,never a fe m ,s ,

ACTION: b M e "" *' I" ' A A * '

a. With one turbine control valve, or one turbine stop valve per high pressure turbine steam lead inoperable and/or with one turbine low pressure stop valve or intercept valve per low pressure turbine steam lead inoperable, restore the inoperable valve (s) to OPERABLE i status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or close at least one valve in the affected  !

steam lead (s) or isolate the turbine from the steam supply within l the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

Whentac ai olewt rw/s/o.u oF Speinc.Weaf/r > et estec te<.m3-0,y are not apph'cahte we valve the c. R /cudb) ha.s deep' i

b. With the above required turbine overspeed protection system otherwise d* l inoperable, within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> isolate the turbine from the steam supply. J SURVEILLANCE REQUIREMENTS 4.3.8.1 The provisions of Specification 4.0.4 are not applicable.

4.3.8.2 The above required turbine overspeed protection system shall be demonstrated OPERABLE:

a. At least once per 7 days by cycling each of the following valves through at least one complete cycle from the running position and observing valve closure:

1. Four high pressure turbine stop valves,

2. Six low pressure turbine low pressure stop valves,

3. Four high pressure turbine control valves, and

4. Six low pressure turbine intercept valves.

b. At least once per 18 months by performance of a CHANNEL CALIBRATION of the turbine overspeed protection instrumentation.

c. At least once per 40 months

• by dismantling and inspecting at least I cne of each of the above valves and performing a visual and surf ace inspection of all valve seats, disks, and stems and verifying no l unacceptable flaws or excessive corrosion. If unacceptable flaws or excessive corrosion are found, all other valves of that type shall be inspected.

• The initial surveillance test interval is extended on a one time basis to the first refueling outage.

FERMI - UNIT 2 3/4 3-85 Anendment ilo. 33 t

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- INSTRUMENTATION (~

BASES ,

MONITORING INSTRUMENTATION (Continued) n 3/4.3.7.12 RADIOACTIVE GASEDUS EFFLUENT MONITORING INSTRUMENTATION The radioactive gaseous effluent monitoring instrumentation is provided to monitor and control, as applicable, the releases of radioactive materials in gaseous effluents during actual or potential releases of gaseous effluents.

The alarm / trip setpoints for these instruments shall be calculated and adjusted i in accordance with the methodology and parameters in the ODCM utilizing the system oesign flow rates as specified in the ODCM. This conservative method is used because the Fermi 2 design does not include flow rate measurement.

devices. This will ensure the alarm / trip will occur prior to exceeding the j limits of 10 CFR Part 20. Thir, instrumentation also includes provisions for monitoring and controlling the concentrations of potentially explosive gas mixtures in the main condenser offgas treatment system. The OPERABILITY and use of this instrumentation is consistent with the requirements of General Design Criteria 60, 62,- and 64 of Appendix A to 10 CFR Part 50.

3/4.3.8 TURBINE OVERSPEED PROTECTION SYSTEM 1

AcW Beses .Daseef edification is provided to ensure that the turbin eed l protection sys +' ntation and the turbine s rol valves are i I

OPERABLE and will protect t e ssive overspeed. Protection from turbine excessive over not req rotect safety-related

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components, e , , or structures. However, it is in rder to i erall plant reliability.

l 3/4.3.9 FEEDWATER/ MAIN TURBINE TRIP SYSTEMS ACTUATION INSTRUMENTATION The feedwater/ main turbine trip systems actuation instrumentation is l provided to initiate action of the feedwater system / main turbine trip system l in the event of a high reactor vesttl water level due to failure of the feedwater controller under maximum demand.

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A FERMI - UNIT 2 B 3/4 3-6

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INSERT POR PAGE B 3/4 3  !

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3/4.3.8 'EUIBINE OVEllSPEED PIGECTICM SYS'!!BE j 1

1 This Specification is provided to ensure that at least one of the main i turbine overspeed protection systems and the turbine speed control i valves are OPERABLE and that they will be available to protect the 'j turbine from excessive overspeed. i The turbine generator is protected from excessive overspeed by two types of emergency overspeed trip protection systems, the mechanical i overspeed trip system and the electrical overspeed trip system. The  !

mechanical overspeed trip system consists of two redundant systems 'l using two separate eccentric trip rings mounted on the turbine shaft. .

Either mechanical trip system will result in a trip of the turbine and meets the requirements of this Specification. I The electrical overspeed system uses four separate and redundant. I channels of speed measurement. The four channels are arranged so that any combination of two channels will result in a trjp of the turbine.  !

This system also fulfills the requirement of this Specification. j Protection from turbine excessive overspeed is not required to protect safety-related conponents, equipment, or structures. However, it is included in the Technical Specifications in order to inprove overall  ;

plant reliability. j i

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