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Revised Pages to Proposed Tech Specs Change 89-36,changing Wording Proposed for Section 3/4.2.4
	ML20033H222
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Site:	Sequoyah
Issue date:	04/09/1990
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ENCLOSURE REVISED JUSTIFICATION AND TECHNICAL SPECIFICATION PAGES SEQUOYAH NUCLEAR-PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-89-36)

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POWER DISTRIBUTION LIMITS I

ACTION:

(Continued) 2.

Reduce THERMAL POWER to less than 50% of. RATED THERMA within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and reduce the Power Range Neutron Flux-High

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Trip Setpoints to less than or equal to 55% of RATED THERMAL-POWER within the next 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months 's.

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Identify and correct the cause of the'out of limit condition

' prior to increasing THERMAL POWER; subsequent POWER OPERATIONL above 50% of RATED THERMAL POWER may proceed provided that the QUADRANT POWER TILT RATIO is verified within its limit at least once per hour for 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or_ until verified 'at 95% or greater RATED THERMAL POWER..

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The provisions of Specification 3.0.4 are not applicable.

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_ SURVEILLANCE REQUIREMENTS 4.2.4.1 limit above 50% of RATED. THERMAL POWER by:The QUADRANT TP Calculating the ratio at least once per 7 days when the alarm.is a.

OPERABLE.

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Calculating the ratio at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months during steady state

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operation when the alarm is inoperable.

7 4.2.4.2 The QUADRANT POWER TILT RATIO shall;be determined to be within the limit when above 75 percent of RATED THERMAL POWER with on.e Power. Range Channel _ inoperable by using the movable incore detectors to confirm that the-thimble locations ds consistent with the indicnormalized symmetric po yp at least once per 12 hourAce. preou p epp_ated QUADRANT POWER TILT RAT f

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TABLE 3.3-1 (Continued)

T_ABLE NOTATION-1 a

2 With the reactor trip system breakers in the closed position and the control 3

rod drive system capable of rod withdrawal, and fuel in the reactor vessel.

na The channel (s) associated with the protective functions derived from the out of service Reactor Coolant Loop shall be placed in the' tripped condition.

t The provisions of Specification 3.0.4 ar'e not applicable.

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4 High voltage to dete'ctor may be de-energized above the P-6 (Block of Source l

Range Reactor Trip) setpoint.

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ACTION STATEMENTS 1'

o ACTION 1 -

With the number of channels OPERABLE one less than required by.

.....the Minimum Channels OPERABLE requirement, restore the inoperable i

channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and/or open the reactor trip breakers.

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ACTION 2 -

With the number of OPERABLE channels one less than the Total Number of Channels, STARTUP and. POWER OPERAT provided the following conditions are satis (LON may proceed a

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i The inoperable channel is placed in the tripped condition a.

i within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

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The Minimum Channels OPERABLE requirement is met; however,.

one additional channel may be' bypassed for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months lR51 for surveillance testing per Specification 4.3.1.1.l.

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c,.7-September 17, 1986 SEQUOYAH - UNIT 1 3/4 3-5 Amendment No. 4'7 4

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POWER DISTRIBUTION LIMITS

. (s 'f-ACTION:' (Continued) 4 2.

Reduce THERMAL POWER to less than 50% of RATED THERMAL. POW within-2 hours and reduce the Power. Range Neutron Flux-High Trip Setpoints to less than or equal to 55% of RATED THERMAL POWER within the next 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

3.

Identify and correct the*cause of the out.of limit condition prior to increasing THERMAL POWER;' subsequent POWER OPERATION:

above 50% of RATED THERMAL POWER may proceed provided that'the QUADRANT. POWER TILT RATIO is. verified within its limit at least once per hour for 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or until-verified at 95% or greater RATED THERMAL POWER.

[,,C The provisions of Specification 3.0.4 are not' applicable.

_ SURVEILLANCE REOUIREMENTS 4.2.4.1 The QUADRANT POWER TILT RATIO.shall be determined to be within limit above 50% of RATED THERMAL POWER by:

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Calculating the ratio at least once per 7 days when the. alarm is a.

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Calculating the ratio at-least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months during steady state operation when the alarm is inoperable.

4.2.4.2 The QUADRANT POWER TILT RATIO shall be determined to be w

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s symmetric power distribution, obtained from 4 pairs of symmetric thimble locations, s consistent with the indicated QUADRANT ~ POWER. TILT RATIO once per 1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .Nrt p g.,g 7ee ppp,ygg g,, g pg.c g,gg y q

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TABLE NOTATION' A

With the reactor trip system' breakers in t.he closed-position, the 4

control rod drive system capable of rod withdrawal, and fuel in the-reactor vessel.

t AA The channel s out of serv (ce) Reactor Coolant Loop shall be place i

b condition.

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The provisicas of Specification 3.0.4 are not applicable.

Range-Reactor Trip) setpoint.High voltage to detector may be d

_ ACTION STATEMENTS ACTION 1 - With the number of OPERABLE channels one les the Minimum Channels OPERABLE requirement within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and/or_open the rea ACTION 2 - With the number of OPERABLE channels e

Number of Channels provided the follow,ing conditions are satisfied:STARTUP The inoperable channel is'placed in the tripped co diti a.

within'& hours.

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The Minimum Channels OPERABLE requirement is met; ho 3

one additional channellmay be-bypassed for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ,

for surveillance testing per Specification 4.3.1.1.1. #

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Justification for Change New action statements are proposed for TS 3.2.4 to specifically address the situations when SRs 4.2.4.1 and 4.2.4.2 cannot be performed in the timeframe specified.

The action statements apply any time the SRs cannot be performed,-

regardless of the cause.

The new action statements have specific timeframes for power reduction consistent with TS 3.0.3.- The new action statements have specific power levels consistent with the power levels specified in the applicability section of TS 3.2.4, SR 4.2.4.2, and Action 2.c of Table 3.3-1.

The new action statements have repair times specified that are longer than the other action statements in TS 3.2.4.

This difference is appropriate because the other action statements in TS 3.2.4 apply for the cases where the Quadrant power tilt ratio is out of limits, a situation that needs a quick remedy..The proposed action statements for TS 3.2.4 apply for the cases where only monitoring capability is affected. TVA believes that it is prudent to provide sufficient repair time for a loss of monitoring capability to provide a reasonable opportunity to remedy the situation before requiring that a plant transient be introduced.

In the absence of any immediate safety issue (e.g., out-of-limit conditions), repairs should be considered before initiating any plant transient that could evolve into a more severe condition if problems occur.

The proposed action statements provide. clear guidance to the operator that is consistent with present requirements but in a more user friendly format.

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eliminates the need to apply TS 4.0.3 when SRs 4.2.4.1 or 4.2.4.2 cannot be performed as required.

It eliminates the need to recognize that none of the current actions in TS 3.2.4 apply, and consequently the requirements of TS 3.0.3 must be followed.

It eliminates the need to recognize that'the-requirements of TS 3.0.3 are satisfied when power.is reduced such that SR 4.2.4.2 no longer applies.

A revision to Action 2 of Table 3.3-1 is proposed to eliminate requirements that are redundant to SRs 4.2.4.1 and 4.2.4.2 and the new proposed action statements described above. Action 2.d is deleted because it is redundant to SR 4.2.4.2.

Action 2.c is revised to delete information that either more appropriately belongs-in TS 3.2.4 since it contains remedial actions for quadrant power tilt ratio requirements or cannot'be followed (e.g.,

recalibration with a channel in trip status).

In particular. the actions to recalibrate the power range neutron flux high trip setpoint to.85 percent power after a power reduction to 75 percent power cannot be accomplished with a failed channel in the tripped condition, as required by Action 2.a.

Verification of the reduced setpoint cannot'be accomplished without completing the reactor trip logic and causing a reactor trip. Action 2.c will now simply direct the operator to TS 3.2.4 for quadrant power tilt ratio monitoring.

TS-3.2.4, as modified, contains all SRs and remedial actions related to quadrant power tilt ratio monitoring.

Addition of the option of using a full core map to verify normalized power-distribution meets the intent of the original SR 4.2.4.2.

A full core' map using the incore movable detectors will provide information pertaining to quadrant power tilt ratio that is equivalent to that obtained using the four pairs of symmetric thimbles.

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4 Significant Hazards Evaluation TVA has evaluated the proposed TS change and has determined that it does not represent a.significant hazards consideration based on criteria established in 10 CFR 50.92(c). Operation of SQN in accordance with the proposed amendment will not:

.1.

Involve a significant increase in the probability lor consequences of an accident previously evaluated.

The proposed revisions to the action statements for TS 3.2.4, " Quadrant

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Power Tilt Ratio," and Action-2 of Table 3.3-1 for the reactor trip system power range channels are administrative in nature and include a reformatting of existing requirements in a user-friendly format to eliminate the potential for misinterpretation'and the' deletion of a-g requirement that.cannot be implemented.. Use of.al full-core map to confirm.

normalized power distribution provides information pertaining-to quadrant power tilt ratio that is equivalent to that cbtained using the four pairs of symmetric. thimbles. These changes have no impact on the probability or consequences of an accident previously evaluated.

2.

Create the possibility of a new or different kind of accident from any previously analyzed.

The proposed revisions to the action. statements for TS 3.2.4, " Quadrant Power Tilt: Ratio," and Action 2 of. Table'3.3-1 for the reactor trip system power range channels;are administrative in nature and-include a reformatting of existing requirements in.a user-Eriendly format to eliminate the potential-for misinterpretation and the deletion of a-requirement that cannot be implemented. Use of a full core map to confirm A

normalized power distribution provides information pertaining to quadrant power tilt ratio that is equivalent to.that obtained using the four pairs of symmetric thimbles. These changes'do not create the possibility of a new or different kind of accident from any previously analyzed.

3.

Involve a significant reduction in a margin ~of safety.

The proposed revisions to the action statements for TS 3.2.4, " Quadrant Power Tilt Ratio," and Action 2 of. Table 3.3-1 for the reactor trip system power range channels are administrative in nature and include a reformatting of existing requirements in a user-friendly format to eliminate the-potential for misinterpretation and the deletion of a requirement that cannot be implemented. Use of a full ' core map to confirm l

normalized power distribution provides information pertaining to quadrant power tilt ratio that is equivalent to that obtained using the four pairs of symmetric thimbles. These changes do not involve a reduction in any margin of safety.

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ML20033H222

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