ML20211K841

Proposed Tech Specs Deleting Inequality Signs from Trip Setpoints in SR 3.3.5.3 & Reflecting Info on Calibr Tolerance Band

ML20211K841
Person / Time
Site:	Wolf Creek
Issue date:	09/02/1999
From:	WOLF CREEK NUCLEAR OPERATING CORP.
To:
Shared Package
ML20211K834	List: ML20211K830 ML20211K841
References
NUDOCS 9909080081
Download: ML20211K841 (3)

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Attachment I to C0 99-0063 l', Page 1 of 1 LOP DG Start instrum:ntation t 3.3.5 i ',,

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY l t

SR 3.3.5.1 Not Used. l j

SR 3.3.5.2 NOTE 1 Verification of time delays is not required.

Perform TADOT. 31 days SR 3.3.5.3 FmQ Perform CHANNEL CAllBRATION with* Trip Setpoint 18 i.'onths and Allowable Value as follows: s2.5V

a. Loss of voltage Allowable Value 2 ,120V with a time delay of 1.0 + 0.2, -0.5 sec.

Loss of voltage Trip Setpoint@83V,120V bus with a time delay of 1.0 sec. g,q ,

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b. Degraded voltage Allowable Value 2 120V bus with a time delay of 119 11.6 sec.

1 Degraded voltage Trip Setpoint @106.9V,120V bus with a tima delay of 119 sec.

i SR 3.3.5.4 Verify LOP DG Start ESF RESPONSE TIMES are 18 months on a within limits. STAGGERED TEST BASIS Wolf Creek - Unit 1 3.3-45 Amendment No.123 9909000001 990902 PDR ADOCK 05000482 P PDR

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"Attischment 11-to C0 99-0063 i Page-1-of 1 LOP DG Start instrumIntiti:n I~ %7n*p Setp'b eredbe. nominal B 3.3.5 l- pre. set . An lua. at which 4he bis 4MA.a.s l i.j .*

• whr.n +be. g btA A consteleveA ,% be. peperg adfuted.

p BASES. bmA.b chame.t  % lef.t " valaa.

a.cwacy La withvn

. ha. ho .nded. -to\evenu l

BACKGROUND RCP. There are four of these 8-second timers per bus, one for each (continued) degraded voltage channel. The bistable outputs are then combined in a two-out-of-four logic to generate a degraded voltage signal if the voltage f

is below approximately 90%. Once the two-out-of four logic is satisfied, contacts in the bus feeder breaker trip circuits closed to arm the tripping l

circuitry. If a safety injection signal (SIS) were to occur concurrently with

! or after the arming of the tripping circuitry, the bus feeder breaker would l

open immediately, a bus undervoltage would be sensed, and a LOP signal would be generated. Should the degraded voltage condition occur in a non-accident condition (no SIS present), an additional 111 second I

time delay is provided. These time delays are specific to the feeder breakers (2 per bus). If the degraded voltage is not alleviated in the overall 119 seconds (nominal delay), the bus feeder breaker is tripped.

OPERABILITY of LSELS is addressed in LCO 3.8.1, "AC Sources -

l Operating," And LCO 3.8.2, "AC Sources - Shutdown."

Trio Setpoints and Allowable Values The Trip Setpoints used in the relays are based on References 1 and 2.

The selection of these Trip Setpoints is such that adequate protection is f

l provided when all sensor and processing time delays are taken into

. account.

The actual nominal Trip Setpoint entered into the relays is normall still

! more conservative than that required by the Allowable Value.

l measured setpoint does not exceed the Allowable Value, the relay is j considered OPERABLE.

1 Setpoints adjusted in accordance with the Allowable Value ensure that the consequences of accidents will be acceptable, provided the unit is operated from within the LCOs at the onset of the accident and that the I equipment functions as designed.

j gCn_omi"*O i

Alicwable Values and/orTrip Setpoints are specified for each Function in SR 3.3.5.3. Nominal Trip Setpoints are also specified in the unit specific setpoint calculations. The nominal setpoints are selected to ensure that the setpoint measured by the surveillance procedure does not exceed the Allowable Value if the relay is performing as required. If the measured setpoint does not exceed the Allowable Value, the relay is considered OPERABLE. Operation with a Trip Setpoint less conservative than the nominal Trip Setpoint, but within the Allowable Value, is acceptable provided that operation and testing is consistent with the assumptions of the setpoint calculation. Each Allowable Value and/or Trip Setpoint Wolf Creek - Unit 1 B 3.3.5-2 Revision 0 i

I Attachment III to CO 99-0063

." Page 1 of 1 f, r e e LIST OF COMMITMENTS The following table identifies those actions committed to by Wolf Creek Nuclear Operating Corporation (WCNOC) in this document. Any other statements i in this submittal are provided for information purposes and are not considered I to be commitments. Please direct questions regarding these commitments to Mr.

Michael J. Angus, Manager Licensing and Corrective Action at Wolf Creek Generating Station, (316) 364-4077.

COtedITMENT Due Date/ Event None 1

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