ML20206P395

Proposed Tech Specs 3/4.3.8 & 3/4.7.6,revising Turbine Overspeed Protection Sys & Turbine Bypass Sys,Respectively, to Reduce Probability of Generating Turbine Missile

ML20206P395
Person / Time
Site:	Clinton
Issue date:	06/30/1986
From:	ILLINOIS POWER CO.
To:
Shared Package
ML20206P385	List: ML20206P395 U-600619, Amend to Application for Ol,Changing Tech Specs 3/4.3.8 Turbine Overspeed Protection Sys & 3/4.7.6 Turbine Bypass Sys to Reduce Probability of Generating Turbine Missile
References
NUDOCS 8607020116
Download: ML20206P395 (2)

Text

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. W & REVIEW COPY 1 INSTRUMENTATION. -.

1 3/4.3.8 TURBINE OVERSPEED PROTECTION SYSTEM LIMITING CONDITION FOR OPERATION .

3.3.8 At least one turbine overspeed protection system sh'all be OPERABLE.

APPLICABILITY: OPERATIONAL CONDITIONS 1 and 2.

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ACTION: , ,

a, With the above required tu,rbine overspeed protection system otherwise --

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. '

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a 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: g

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

1. Four high-presswe-ttsrtrine-contrcl valves,* - - - . . - - .

/.8 Four low pressure turbine combined intermediate valves, and '

.2. .E' Four high pressure turbine stop valves.

l MC , d At least once per 18 months by performance of a CHt.HNEL CALIBRATION of the turbine overspeed protection instrumentaticn.

, de* At least..once per 40 months by disassembling at least one of each of the above valves and performing a visual and surface inspection of all valve e

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L 'sieats, disks and stems and verifying no unacceptable flaws or excessive corrosion. If unacceptable flaws or excessive corrosion are found, all other valves of that type shall be inspected.

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8607020116 860630 PDR ADOCK 05000461 A PDR CLINTON - UNIT 1 3/4 3-108 JUN 0 4.1995

1 PROOF & REYlEW COPY l PLANT SYSTEMS 3/4.7.6 MAIN TURBINE BYPASS SYSTEM LIMITING CONDITION FOR OPERATION .

3.7.6 The main turbine bypass system shall be OPERABLE.  ;

-t APPLICABILITY: OPERATIONAL CONDITION 1. _

ACTION:

[i With the main turbine bypass system inoperable, restore the system to OPERABLE  !

status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or reduce THERMAL POWER to less than 25% of RATED THERMAL POWER within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. k.

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SURVEILLANCE REQUIREMENTS 4.7.6 The main turbine bypass system shall be demonstrated OPERABLE:

, a. At least once pe ays by cycling each turbine-bypass valve through at least one complete cycle of full travel, and ,

b. At least once per 18 months by: ,

1. Performing a system functional test which includes simulated auto- _

.matic actuation and verifying that each automatic valve actuates to -- .,

its correct position.

2. Demonstrating TURBINE BYPASS SYSTEM RESPONSE TIME meets the following requirements when measured from the initial movement of the main

, turbi.,ne stop or control valve:

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Y a) 80% of turbine bypass system capacity shall be established in 5 0.3 seconds.

b) Bypass valve opening shall start in 1 0.1 seconds.

1 CL'INTON - UNIT 1 3/4 7-16 JUN O4 1c.SS f

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