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| | . 0 ENCLOSURE 1 PR0 POSED TECHNICAL SPECIFICATION SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 TVA-SQN-TS-48 |
| | ; CHANGE IN THE ACTION REQUIREMENTS FOR THE l |
| | SUBC00 LING MARGIN MONITOR (T/S 3.3.3.7) l i |
| | 8308240181 830819 PDR ADOCK 05000327 P PDR |
| | |
| | e INSTRUMENTATION ACCIDENT MONITORING INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.3.7 The accident monitoring instrumentation channels shown in Table 3.3-10 shall be OPERABLE. |
| | APPLICABILITY: MODES 1, 2 and 3. |
| | ACTION: - |
| | : a. With the number of OPERABLE accident monitoring instrumentation channels, except for the RCS.subcooling margin monitor, less than the Required Number of Channels shown in Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours, |
| | : b. With the number of OPERABLE accident monitoring instrumentation channels less than the MINIMUM CHANNELS OPERABLE requirements of Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 48 hours or be in at least HOT SHUTDOWN within the next 12 hours. |
| | : c. With the RCS subcooling margin monitor inoperable, the margin will be verified once per shift until the monitor is restored to OPERABLE status. With the monitor operable for more than (2) hours, prepare and submit a special report to the NRC, Region II, pursuant to specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel to OPERABLE status. . |
| | 1 l |
| | SURVEILLANCE' REQUIREMENTS 1 |
| | I 4.3.3.7 Each accident monitoring. instrumentation channel shall be demon-stratea OPERABLE by performance of the CHANNEL CHECK and CHANNEL CALIBRATION cperatione at the frequencies shown in Table 4.3-7. |
| | 1 I . |
| | SEQUOYAH - UNIT 1 3/4/3-55 |
| | |
| | . } |
| | e-INSTRUMENTATION ACCIDENT MONITORING INSTRUMENTATION I |
| | LIMITING CONDITION FOR OPERATION 3.3.3.7. The accident monitoring instrumentation channels shown in Table 3.3-10 shall be OPERA 8LE. - |
| | APPLICABILITY: MODES 1, 2 and 3. |
| | ACTION: ~ ~ . |
| | : a. With the number of OPERABLE accident monitoring instrumentation channels, |
| | ; except for the RCS. subdooling margin monitor, less than the Required Number of Channels shown in Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours. |
| | : b. With the number of OPERABLE accident monitoring instrumentation channels i less'than the MINIMUM CHANNELS OPERABLE requirements of Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 48 hours or be in at least HOT SHUTDOWN within the next 12 hours. |
| | : c. With the RCS subcooling margin monitor inoperable, the margin will be verified once per shift until the monitor is restored to OPERABLE status. With the monitor operable for more than (2) hours, prepare and submit a special report to the NRC, Region II, pursuant to specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel to OPERABLE status. |
| | I SURVEILLANCE' REQUIREMENTS 4.3.3.7 Each accident monitoring. instrumentation channel shall be demon-strated OPERABLE by performance of the CHANNEL CHECK and CHANNEL CALIBRATION operations at the frequencies shown in Table 4.3-7. |
| | t l . |
| | 1 . |
| | SEQUOYAH - UNIT 2 3/4 3-56 |
| | .~.... - . .. ...~ . - - . . . - . . . .. . ~ . . - ... . - - _._ |
| | - . --e-v- , _ . - ., y .g. . , ., ., .__%,.__y., ,,. ,,- ..m.,,- . |
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| | ) |
| | ENCLOSURE 2 JUSTIFICATION FOR PROPOSED TECHNICAL SPECIFICATION CHANGE TVA-SQN-TS-48 SEQUOYAH NUCLEAR PLANT This change will allow continued plant operation while requiring verifi-cation of the subcooling margin by utilization of existing instrumentation. |
| | The revised action statement will require a special report to be submitted to the NRC, Region II, if a subcooling margin monitor is inoperable for more than two hours. This special report will be submitted in lieu of a Licensee Event Report (LER). |
| | The subcooling margin monitor provides information that is available from other sources. TVA's training program includes training on verifying adequate subcooling margin using pressure and temperature instrumenttion and the steam tables. This change will also avoid the need for an emergency technical specificaticn change in the event that the monitor is inoperable for more than 7 days. Attachment 1 provides the significant hazards consideration determination. The proposed change was evaluated pursuant to 10 CFR Part 50.92, and no significant hazards considerations are involved. |
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| | l - - - - - ----- |
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| | . t ATTACHMENT 1 SIGNIFICANT HAZARDS CONSIDERATIONS DETERMINATION |
| | : 1. Is the probability of an occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report increased? |
| | The subcooling margin monitor is a NUREG-0737 requirement. The existing instrumentation provided sufficient information to determine whether there was an adequate subcooling margin. The operators are trained to use the pressure and temperature indication to verify the existence of adequate subcooling. The subcooling monitor does not provide any accident mitigating function, and its loss will not increase the probability or consequences of an accident. |
| | '~ |
| | : 2. Is''t'e h [o'ssib'ility for an accident or mNlfunctio'n of a different type . |
| | than evaluated previously in the safety analysis report created? |
| | Temporary loss of the subcooling monitor will not create a new accident scenario. The loss of information is compensated for by existing instrumentation and operator training. |
| | i l |
| | 3 Is the margin of safety as defined in the basis of any technical specification reduced? |
| | l The monitor does not provide a protective function. Its loss will not change the margin to safety. Alternate methods of determining adequate subcooling are already in place. |
| | -_ -. - _ . - . - . . _ . . - - _ _ .- . -.- .,, _ - -}} |
Proposed Tech Spec Re Change in Action Requirements for Subcooling Margin Monitor.Justification & Significant Hazards Consideration Determination EnclML20076E160 |
Person / Time |
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Site: |
Sequoyah |
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Issue date: |
08/19/1983 |
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From: |
TENNESSEE VALLEY AUTHORITY |
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To: |
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Shared Package |
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ML20076E155 |
List: |
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References |
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TVA-SQN-TS-48, NUDOCS 8308240181 |
Download: ML20076E160 (5) |
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Category:TECHNICAL SPECIFICATIONS
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[Table view] Category:TECHNICAL SPECIFICATIONS & TEST REPORTS
MONTHYEARML20217F9701999-10-14014 October 1999 Proposed Tech Specs,Incorporating ARC for Axial Primary Water Stress Corrosion Cracking at Dented Tube Support Plate Intersections ML20217E4301999-10-12012 October 1999 Proposed Tech Specs,Revising Requirements for Containment Penetrations During Refueling Operations ML20211M7341999-08-30030 August 1999 Marked-up & Revised TS Pages,Providing Alternative to Requirement of Actually Measuring Response Times ML20211K1721999-08-30030 August 1999 Proposed Tech Specs,Providing Clarification to Current TS Requirements for Containment Isolation Valves ML20209B7731999-06-30030 June 1999 Proposed Tech Specs Updating Requirmements for RCS Leakage Detection & RCS Operational Leakage Specifications to Be Consistent with NUREG-1431 ML20196F2211999-06-24024 June 1999 Proposed Tech Specs Pages for Amend to Licenses DPR-77 & DPR-79,allowing Use of Fully Qualified & Tested Spare Inverter in Place of Any of Eight Required Inverters ML20196G4701999-06-24024 June 1999 Proposed Tech Specs Pages Re Amends to Licenses DPR-77 & DPR-79,revising TS to Be Consistent with Rev to ISTS Presently Submitted to NEI TSTF for Submittal as Rev to NUREG-1431 ML20196G7961999-06-22022 June 1999 Proposed Tech Specs Bases,Clarifying Proper Application of TS Requirements for Power Distribution Systems & Functions That Inverters Provide to Maintain Operability & Providing Updated Info on Cold Leg Injection Accumulators ML20196G8071999-06-22022 June 1999 Revs to Technical Requirements Manual ML20195E9841999-06-0707 June 1999 Proposed Tech Specs,Increasing Max Allowed Specific Activity of Primary Coolant from 0.35 Microcuries/Gram Dose Equivalent I-131 to 1.0 Microcuries/Gram Dose Equivalent I-131 for Plant Cycle 10 (U2C10) Core ML20206E1611999-04-29029 April 1999 Proposed Tech Spec Change 99-04, Auxiliary Suction Pressure Low Surveillance Frequency Rev. 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[Table view] |
Text
._ _ -_ . _. _ _ .
. 0 ENCLOSURE 1 PR0 POSED TECHNICAL SPECIFICATION SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 TVA-SQN-TS-48
- CHANGE IN THE ACTION REQUIREMENTS FOR THE l
SUBC00 LING MARGIN MONITOR (T/S 3.3.3.7) l i
8308240181 830819 PDR ADOCK 05000327 P PDR
e INSTRUMENTATION ACCIDENT MONITORING INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.3.7 The accident monitoring instrumentation channels shown in Table 3.3-10 shall be OPERABLE.
APPLICABILITY: MODES 1, 2 and 3.
ACTION: -
- a. With the number of OPERABLE accident monitoring instrumentation channels, except for the RCS.subcooling margin monitor, less than the Required Number of Channels shown in Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />,
- b. With the number of OPERABLE accident monitoring instrumentation channels less than the MINIMUM CHANNELS OPERABLE requirements of Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
- c. With the RCS subcooling margin monitor inoperable, the margin will be verified once per shift until the monitor is restored to OPERABLE status. With the monitor operable for more than (2) hours, prepare and submit a special report to the NRC, Region II, pursuant to specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel to OPERABLE status. .
1 l
SURVEILLANCE' REQUIREMENTS 1
I 4.3.3.7 Each accident monitoring. instrumentation channel shall be demon-stratea OPERABLE by performance of the CHANNEL CHECK and CHANNEL CALIBRATION cperatione at the frequencies shown in Table 4.3-7.
1 I .
SEQUOYAH - UNIT 1 3/4/3-55
. }
e-INSTRUMENTATION ACCIDENT MONITORING INSTRUMENTATION I
LIMITING CONDITION FOR OPERATION 3.3.3.7. The accident monitoring instrumentation channels shown in Table 3.3-10 shall be OPERA 8LE. -
APPLICABILITY: MODES 1, 2 and 3.
ACTION: ~ ~ .
- a. With the number of OPERABLE accident monitoring instrumentation channels,
- except for the RCS. subdooling margin monitor, less than the Required Number of Channels shown in Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
- b. With the number of OPERABLE accident monitoring instrumentation channels i less'than the MINIMUM CHANNELS OPERABLE requirements of Table 3.3-10, restore the inoperable channel (s) to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
- c. With the RCS subcooling margin monitor inoperable, the margin will be verified once per shift until the monitor is restored to OPERABLE status. With the monitor operable for more than (2) hours, prepare and submit a special report to the NRC, Region II, pursuant to specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel to OPERABLE status.
I SURVEILLANCE' REQUIREMENTS 4.3.3.7 Each accident monitoring. instrumentation channel shall be demon-strated OPERABLE by performance of the CHANNEL CHECK and CHANNEL CALIBRATION operations at the frequencies shown in Table 4.3-7.
t l .
1 .
SEQUOYAH - UNIT 2 3/4 3-56
.~.... - . .. ...~ . - - . . . - . . . .. . ~ . . - ... . - - _._
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ENCLOSURE 2 JUSTIFICATION FOR PROPOSED TECHNICAL SPECIFICATION CHANGE TVA-SQN-TS-48 SEQUOYAH NUCLEAR PLANT This change will allow continued plant operation while requiring verifi-cation of the subcooling margin by utilization of existing instrumentation.
The revised action statement will require a special report to be submitted to the NRC, Region II, if a subcooling margin monitor is inoperable for more than two hours. This special report will be submitted in lieu of a Licensee Event Report (LER).
The subcooling margin monitor provides information that is available from other sources. TVA's training program includes training on verifying adequate subcooling margin using pressure and temperature instrumenttion and the steam tables. This change will also avoid the need for an emergency technical specificaticn change in the event that the monitor is inoperable for more than 7 days. Attachment 1 provides the significant hazards consideration determination. The proposed change was evaluated pursuant to 10 CFR Part 50.92, and no significant hazards considerations are involved.
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. t ATTACHMENT 1 SIGNIFICANT HAZARDS CONSIDERATIONS DETERMINATION
- 1. Is the probability of an occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report increased?
The subcooling margin monitor is a NUREG-0737 requirement. The existing instrumentation provided sufficient information to determine whether there was an adequate subcooling margin. The operators are trained to use the pressure and temperature indication to verify the existence of adequate subcooling. The subcooling monitor does not provide any accident mitigating function, and its loss will not increase the probability or consequences of an accident.
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- 2. Ist'e h [o'ssib'ility for an accident or mNlfunctio'n of a different type .
than evaluated previously in the safety analysis report created?
Temporary loss of the subcooling monitor will not create a new accident scenario. The loss of information is compensated for by existing instrumentation and operator training.
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3 Is the margin of safety as defined in the basis of any technical specification reduced?
l The monitor does not provide a protective function. Its loss will not change the margin to safety. Alternate methods of determining adequate subcooling are already in place.
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