ML20081F571

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Proposed Tech Specs Providing Enhancements for ATWS-RPT Instrumentation & Logic Sys
ML20081F571
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 06/04/1991
From:
COMMONWEALTH EDISON CO.
To:
Shared Package
ML20081F567 List:
References
NUDOCS 9106100510
Download: ML20081F571 (12)
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Text

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AUACliMENLB PROPOSED CHANGES TO APPENDIX A, TECilNICAL SPECIFICATIONS OF FACILITY OPERATING LICENSES NPF-11 AND NPF-18 REVISED _PAGES UNILONElNPL-ID UNILTHQJNPL-J 81 3/4 3-35 3/4 3-35 3/4 3-36 3/4 3-36 3/4 3-38 3/4 3-38 ,

Insert Page Insert Page I i

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, INSTRUMENTATION 3/4.3.4 RECIRCULATION PUMP TRIP ACTUATION INSTRUMENTATION ATWS RECIRCULATION PUMP TRIP SYSTEM INSTRUMENTATION LIMITING 20NOITION FOR OPERATION 3.3.4.1 The anticipated transient without scram recirculation pump trip (AT'45-RPT) system instrumentation channels shown in Table 3.3.4.1-1 shall be OPERABLE with their trip setpoints set consistent with the values shown in the Trip Setpoint column of Table 3.3.4.1-2.

APPLICABILITY: OPERATIONAL CONDIlION 1.

ACTION:

a. With an Ah'S recirculation pump trip system instrumentation channel
  • trip setpoint less conservative then the value shown in the Allowable Values column of Table 3.3.4.1-2, oeclare the chanael inoperable until the channel is restored to OPERABLE status with i'.s trip setpoint adjusted consistent with the Trip Setpoint value.

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

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  • Minimum OPERABLE Channels requirement for.one trip function in one

%.. ' trip system, restore the inoperable :hannel to OPERABLE status within 14 days or be in at least STARTUP within the next 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. J SURVEILLANCE REOUIREMENTS 4.3.4.1.1 Each ATWS recirculation- pump trip system instrumentation channel shall be demonstrated OPERABLE by the performance of the CHANNEL CHECK, CHANNEL FUNCTIONAL TEST and CHANNEL CALIBRATION operations at the frequencies shown-in Table 4.3.4.1-1.

4.3.4.1.2 LOGIC SYSTEM FUNCTIONAL TESTS and simulated autom, tic operation of all channels shall be performed at least once per 18 months.

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"The specified 18-month interval may be walvad for Cycle 1 provided the surveillance is performed during Refuel 1. ) l LA SALLE - UNIT 1 3/4 3-35 Amendment No.24

INSERT A

b. With the number of OPERABLE channels one less than required by the Minimum OPERABLE Channels per Trip System requirement for one or both trip systems, placa the inoperable channel (s) in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />,
c. With the number of OPERABLE channels two or more less than required by the Minimum OPERABLE Channels per Trip System requirement for one trip system and:
1. If the operable channels consist of one reactor vessel water level channel and one reactor vessel pressure channel, place both inoperable channels in the tripped condition within I hour, or, if this action will initiate a pump trip, declare the trip system inoperable.
2. If the inoperable channels include two reactor vessel water level channels or two reactor vessel pressure channels, declare the trip system inoperable,
d. With one trip system inoperable, restore the inoperable trip system to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least STARTUP within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />,
e. With both trip systems inoperable, restore at least one trip 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 be in at least STARTUP within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, llLL-9 41/ 21
' G TABLE 3.3.4.1-1 ATWS RECIRCULATION PUMP TRIP SYSTEM INSTRUMENTATION MINIMUMOPERABLECHgNjELS c TRIP FUNCTION PER TRIP SYSTEM
1. Reactor Vessel Water Level - 1 Low Low, Level 2 S U
2. Reactor Vessel Pressure-High 1 (a)0ne chnnel in one trip system may be pi eced in an i,' operable status for up to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for required surveillance provided that all other channels are OPEWABLE.

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l TABLE 4.3.4.1-1 I

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l w ATWS RECIRCULATION PUMP TRIP ACTUATION INSTRUMENTATION SURVEILLANCE REQ (i!REMENTS P

G CHANNEL CHANNEL FUNCTIONAL CHANNEL i

, TRIP FUNCTION- CHECK TEST CALIBRATION

$ l. Reactor Vessel Water level - S M- R Low' Low, Level 2 /

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2. Reactor Vessel Pressure - High' NA M Q [

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INSTRUMENTATION 3/4.3.4 RECIRCULATION PUMP TRIP ACTUATION INSTRUMENTATION ATWS RECIRCULATION PUMP TRIP SYSTEM INSTRUMENTATION, LIMITING CONDITICN FOR OPERATION 3.3.4.1 The anticipated transient without scram recirculation pump trip

.(ATVS-RPT) system instrumentation channels shown in Table 3.3.4.1-1 shall be OPERABLE with their trip setpoints set consistent with the values shown in the Trip Setpoint column of Table 3."L4.1-2.

APPLICABILITY: OPERATIONAL CONDITION 1.

ACTION:

a. With an ATWS recirculation pump trip system instrumentation chaniel trip setpoint less conservative than the value shown in the Allowable Values column of Table 3.3.4.1-2, declare the channel inop: able until the channel is restored to OPERABLE status with its trip f setpoint adjusted consistent with the Trip Setpoint value.

2, 8 b. With the number of OPERABLE channels one less than required by the _ _ _l b Minimum OPERABLE Channels requirement for one trip function in one d

p[ trip system, restore the inoperable channel to OPERABLE status within 14 days or be in at least STARTUP within the next 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, y SURVEILLANCE REQUIREMENTS 4.3.4.1.1 Each ATWS recirculation pump trip system instrumentation channel shall be demonstrated OPERABLE by the performance of the CHANNEL CHECK, CHANNEL FUNCTIONAL TEST and CHANNEL CALIBRATION operations at the frequencies shown in Table 4.3.4.1-1.

4.3.4.1.2 LOGIC SYSTEM FUNCTIONAL TESTS and simulated automatic operation of all channels shall be performed at least once per 18 months.

LA SALLE - UNIT 2 3/4 3-35

INSERT A

b. With the number of OPERABLE channels one less than required by the Minimum OPERABLE Channels per Trip System requirement for one or both trip systems, place the inoperable channel (s) in the tripped condition within I hour,
c. With the number of OPERABLE channels two or more less than required by the Minimum OPERABLE Channels per Trip System requirement for one trip

! system and:

1. If the operable channels consist of one reactor vessel water level channel and one reactor vessel pressure channel, place both
inoperable channels in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, or, if this action will initiate a pump trip, declare tne trip system inoperable.
2. If the inoparable channels include two reactor vessel water level

! channels or two reactor vessel nressure channels, declare the trip system inoperable.

l d. With one trip system inoperable, restore the inoperable trip system to l OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least STARTUP within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

e. With both trip systems inoperable, restore at least one trip system to OPERABLE status within I hour or be in at least STARTUP within the next

! 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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.O l TABLE 3.3.4.1-1 . .

r-l ATWS RECIRCULATION PUMP TRIP SYSTEM INSTRUMENTATION

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E MINIMUMOPERABLECHpNjELS 1

TRIP F8tNCTION FER TRIP SYSTEM l ..

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-4 Low Low, level 2  :

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2. Reactor Vessel Pressure-High 1 4

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(a)One channel in one trip system may be placed in an inoperable status for up to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for required i surveillance provided that all other channels are OPERABLE.

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TABLE 4.3.4.1-1 9

m ATWS RECIRCULATION PUMP TRIP ACTUATION INSTRUMENTATION SURVEILLANCE REQUIREMENTS E CHANNEL CHANNEL FUNCTIONAL CHANNEL 7 TRIP FUNCT'M CHECK TEST CALIBRATION E 1. Reactor Vessel Water Level - 5 M R

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-4 Low Low, Level 2  !

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2. Reactor Vessel Pressure - High. NA H Q S

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AlIACHMENI_C SIGNIFICANT llAZARDS CONSIDERATION Commonwealth Edison has evaluated the proposed Technical Specification Amendment and determined that it does not represent a significant hazards consideration. Based on the criteria for defining a significant hazards consideration established in 10 CFR 50.92, operation of LaSalle County Station Units 1 and 2 in accordance with the proposed amendment will not:

1) Involve a significant increase in the probability or consequences of an accident previously evaluated because:

The action requirements for Technical Specifications 3.3.4.1 provides a higher degree of protection and operational flexibility by addressing all possible combinations of inoperable channels and trip systems, The allowed outage times in the proposed amendment become progressively more restrictive depending on the nature of any failures. The proposed allowed outage. time for an inoperable trip channel is reduced from 14 days to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, The reduced outage times will not significantly increase the probability of an accident previously evaluated.

The proposed amendment to Table 3.3.4.1-1 increases the required number of instrumentation channels from 1 to 2 for each trip system. This enhanced design reflects modifications being made to the anticipated transient without scram-recirculation pump trip (ATHS-RPT) in response to 10 CFR Part 50.62 requirements.

This change clarifies the channel operability requirements for the ATHS-RPT instrumentation and ensures consistent application of the requirements. This amendment will not affect the performance of the ATWS-RPT system. Therefore, the consequences of an accident previously evaluated are not significantly increased by enhancing the ATHS-RPT logic.

The proposed amendment to Table 4,3.4.1-1 adds a shiftly

" channel check" requirement for the ATHS-RPT high reactor vessel pressure instrumentation. The addition of this requirement provides additional assurance of the ATWS-RPT instrumentation operability. The probability of an undetected instrument failure is lessened by the implementation of a shiftly " channel check". The current Technical Specifications do not require this surveillance.

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NLD641/24

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.ihis amendment also removes a footnote that allowed waiver of the 18 month surveillance interval for certain surveillance requirements during Unit 1 Cycle 1. This footnote is no longer j applicable and the change has no impact on-safety.  !

?. ) - Create the possibility of a new or_different kind of accident from any accident previously evaluated because: )

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The proposed amendments are intended to clarify and enhance the- ,

existing Technical Specification requirements. The proposal reflects. improvements being made to the ATHS-RPT instrumentation and does not constitute a change to the operation of the '

' facility as described in the UFSAR. The reduction of allowed outage times from 14 oays to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for the-ATHS-RPT trip channels does not involve any changes to the facility or the operation of the facility as described in the UFSAR. The proposed amendment would not create the possibility of a new or different kind of accident from any accident previously o evaluated.

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Involve a significant reduction in the margin of safety because:

3) l The proposed amendments clarify and enhance _the existing i requirements for ATHS-RPT instrumentation. The changes will l help to reduce the potential for misinterpretation of the i requirements and institute additional surveillance requirements l for the new instrumentation. Therefore, it is CECO's expectation that the proposed amendments will increase the margin of safety.

. Guidance has been provided in " Final Procedures and Standards on No t Significant Hazards Considerations," Final Rule, 51 FR 7744, for.the application of standards to license change requests for determination of the-existence oflsignificant hazards considerations. This document (51 FR 7744)-

provides examples of amendments which are and are not considered likely.to involve =significant hazards considerations. This proposed amendment does not involve a significant relaxation-of the criteria used to establish safety limits, a significant relaxation of the bases for the limiting' safety _ system- -

L settings or a significant relaxation of the bases for the limitir.g conditions for operations. Therefore, based on the guidance provided in the Federal Register and the criteria established in 10CFR50.92(e), the proposed change-does not constitute a significant hazards consideration, l

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ATTACHMENT _D ENVIRONMENTAL ASSESSMENT STATEMENT APPLICABILITY REVIEH Commonwealth Edison has evaluated the proposed amendment against the criteria for the identification of licensing and regulatory actions requiring environmental assessment in accordance with 10 CFR 51.20. It has been determined that the proposed changes meet the criteria for a categorical exclusion as provided under 10 CFR 51.22(c)(9). This conclusion has been determined because the proposed changes do not pose a significant hazards 1 consideration or do not involve a significant increase in the amounts, and no  !

significant changes in the types, of any effluents that may be released  :

offsite. In addition, the proposed changes provide greater controls not included in the present Technical Specifications. This request does not involve a significant increase in individual or cumulative occupational radiation exposure. Therefore, the Environmental Assessment Statement is not applicable for these changes.

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