ML20005F533: Difference between revisions
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.- . DOCKET.NOS. 50-327:AND 50-328' . ., | .- . DOCKET.NOS. 50-327:AND 50-328' . ., | ||
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thereaf ter, and Surveillance Requirement 4.8.1.1.2.a.4 within 8 hj restore at least one of the inoperable sources to OPERABLE status - | thereaf ter, and Surveillance Requirement 4.8.1.1.2.a.4 within 8 hj restore at least one of the inoperable sources to OPERABLE status - | ||
within'12 hours or within and in COLD SHUTDOWN be intheatfollowing least30HOT hours. STAN0BY within the ; | within'12 hours or within and in COLD SHUTDOWN be intheatfollowing least30HOT hours. STAN0BY within the ; | ||
Restore at leas,t ! | Restore at leas,t ! | ||
within 72 hours from the time of initial loss or be in STANOBY 30 hours. within the next 6 hours and in COLO SHUIDOWN wi SEQUDYAH - UNIT 1 3/4 8-1 Amendment No.100 January 31, 1989 | within 72 hours from the time of initial loss or be in STANOBY 30 hours. within the next 6 hours and in COLO SHUIDOWN wi SEQUDYAH - UNIT 1 3/4 8-1 Amendment No.100 January 31, 1989 | ||
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PROPOSED TECHNICAL SPECIFICATION CHANGE 3 J. - | PROPOSED TECHNICAL SPECIFICATION CHANGE 3 J. - | ||
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LL .SEQUOYAH-NUCLEAR PLANT UNITS ILAND.2: | LL .SEQUOYAH-NUCLEAR PLANT UNITS ILAND.2: | ||
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individual diesel generator sets. The requirements of General Design li Criteria 17 of' Appendix A to 10 CFR 50, which specifies the minimum independent and redundant ac power sources, continue to be met by the proposed revision. The action requirements specified for the levels-of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The operability of the power sources is consistent with the initial condition assumptions of the safety analyses and is based , | individual diesel generator sets. The requirements of General Design li Criteria 17 of' Appendix A to 10 CFR 50, which specifies the minimum independent and redundant ac power sources, continue to be met by the proposed revision. The action requirements specified for the levels-of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The operability of the power sources is consistent with the initial condition assumptions of the safety analyses and is based , | ||
upon maintaining at least one onsite ac power source operable during j accident conditions with an assumed loss of offsite power and single : | upon maintaining at least one onsite ac power source operable during j accident conditions with an assumed loss of offsite power and single : | ||
failure of the other onsite ac source. This change has no impact on 1 the probability or consequences of any accident previously evaluated. l (2) Create the possibility of a new or different kind of accident from any previously analyzed, j | failure of the other onsite ac source. This change has no impact on 1 the probability or consequences of any accident previously evaluated. l (2) Create the possibility of a new or different kind of accident from any previously analyzed, j The proposed revision to LCO 3.8.1.1 Action a provides an action for 1 diesel generator inoperability based on power trains rather than individual diesel generator sets. No physical plant modification is l being made, and no analyses are being changed. Therefore, the I proposed change does not create the possibility of a new or different l' kind of accident from any previously analyzed. | ||
The proposed revision to LCO 3.8.1.1 Action a provides an action for 1 diesel generator inoperability based on power trains rather than individual diesel generator sets. No physical plant modification is l being made, and no analyses are being changed. Therefore, the I proposed change does not create the possibility of a new or different l' kind of accident from any previously analyzed. | |||
(3) Involve a significant reduction in a margin of safety. | (3) Involve a significant reduction in a margin of safety. | ||
The proposed revision to LCO 3.8.1.1 Action a provides an action for diesel generator inoperability based on power trains rather than individual diesel generator sets. No physical plant modification is ' | The proposed revision to LCO 3.8.1.1 Action a provides an action for diesel generator inoperability based on power trains rather than individual diesel generator sets. No physical plant modification is ' | ||
Latest revision as of 16:36, 17 February 2020
| ML20005F533 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/05/1990 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20005F522 | List: |
| References | |
| NUDOCS 9001160365 | |
| Download: ML20005F533 (8) | |
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PROPOSED TECHNICAL SPECIFICATION. CHANGE- a r; ~
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o 'SEQUOYAH NUCLEAR PLANT UNI 15E1'AND'2 :j 31 j ' ,. -
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{W. ' t > 01/05/1990 10 53 SCN SITE DIRNSITE LIC' 613 843 7139 P.04 i
- C 314.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE:
a. Two physically independent circuits between the offsite transmission network and the onsite Class IE distribution system, and
- b. ,
Four separate and independent diesel generator sets each with: 1. Two diesels driving a common generator 2. Twogallons 250 engine of mounted fuel, perfuel tanktanks containing a minimum volume of
- 3. A separate fuel storage 62,000 gallons of fuel, system containing a minimum volume of
- 4. A separate fuel transfer pump, and
( 5. A separate 125-volt 0.C. distribution panel,125-volt D.C. battery bank and associated charger. APPLICABILITY: MODES 1, 2, 3 and 4. ACTION: 34M W" ~ Y i a. Wth either an offsite circuit or diesel generatorb of the above ' required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillanc Requirements 4.8.1.1.1.a within one hour and at least once per 8 R10, hou thereaf ter, and Surveillance Requirement 4.8.1.1.2.a.4 within 24 h restore at least two offsite circuits and four diesel generator sets i to OPERABLE status within 72 hours or be in at least HOT S within the next 6 hours and in COLD SHUTDOWN within the followi i 30 hours. b. With one offsite circuit and one diesel generator set of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveilla Requirements 4.8.1.1.1.a within one. hour and at least once per R104 B ho! ( thereaf ter, and Surveillance Requirement 4.8.1.1.2.a.4 within 8 hj restore at least one of the inoperable sources to OPERABLE status - within'12 hours or within and in COLD SHUTDOWN be intheatfollowing least30HOT hours. STAN0BY within the ; Restore at leas,t ! within 72 hours from the time of initial loss or be in STANOBY 30 hours. within the next 6 hours and in COLO SHUIDOWN wi SEQUDYAH - UNIT 1 3/4 8-1 Amendment No.100 January 31, 1989 ( <
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. .f 3/4'.8 ELECTRICAL POWER SYSTEMS
, .i 314.8.1 A.C. SOURCES OPERATING
.a ~ s LIMITING CONDITION FOR OPERATION . . .
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. . , . 3. 8.1.1 OPERABLE: As' a minimum,' the following A.C. electrical power sources shall b 4.
b. network and the onsite Class IE distribution sys Four separate and independent diesel generator sets each with: 1. Two diesels driving a common generator 2. 250 gallons of fuel, per tankTwo engine-mounted fuel tan ( 3 A separate 62,000 gallons fuel storage system containing a minimum volume of of fuel,
,; 4.
A separate fuel transfer pump, and 5. battery bank and associated charger.A separate 125 l APPLICABILITY: MODES 1, 2, 3 and 4. f ACTION: .
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' /v With either an offsite circuit or diesel generatorb'etr o of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surv Requirem nts 4.8.1.1.1.s within one hour and at least once per 8 h thereafter, and Surveillance Requirement 4.8.1.1.2.a.4 within g, 2 restore at least two offsite circuits and four diesel generator sets to OPERABLE status within 72 hours or be in at least HO 4
'30, hours.within the next 6 hours and in COLD SHUTDOWN with i
- b. Wi
' th one offsite circuit and one diesel generator set, of the abo required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surve
. Requirements 4.8.1.1.1.a within one hour and at least once per 8 .
thereafter, and Surveillance Requirement 4.8.1.1.2.a.4 within R89 restore at least one of the inoperable sources to OPERABLE status within and in C0LD 12SHUTDOWNhours orwithin be the in following at least HOT STANDBY with 30 hours. Restore at least within 72 hours from the time of initial loss or b - STANDBY 30 hours. within the next 6 hours and in COLD SHUTDOW ' L , SEQUOYAH - UNIT 2 -7., ,,o
, , 3/4 8-1 Amendment No. ..-
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- . y. v . .- ! s. j y- , ENCLOSURE 2-e 1
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PROPOSED TECHNICAL SPECIFICATION CHANGE 3 J. - m , LL .SEQUOYAH-NUCLEAR PLANT UNITS ILAND.2: DOCKET NOS,l50-327 AND'$0-328- : y w; .. (TVA-SQN-TS-90iO4) F , DESCRIPTION:AND' JUSTIFICATION FOR "
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LCLARIFICATIONOFDIESELGENERATORACTIONREQUIREMENTS hr i I p 4 ..- lL
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- t. ENCLOSURE 2 h
Description of Change-Tennessee' Valley Authority proposes to modify the Sequoyah Nuclear Plant (SQN) Units 1 and 2 technical specifications (TSs) to revise Action Statement a of Limiting Condition'for Operation (LCO) 3.8.1.1 to allow operation to continue with diesel generator Set (s) 1A-A and/or 2A-A or IB-B and/or 2B-B-inoperable provided all four diesel generator sets are _ returned,to operable status within 72 hours. This change provides consistency with otner action-statements for loss of a train of safety equipment. o Reason for Change _ The action st:w nts of LC0 3.8.1.1 are laterna11y inconsistent in that
, Action a alloa antinued operation for 72 hours with a single diesel-generator set inoperable, whereas Action d allows operation to continue-for the same period of time with two diesel generator sets inoperable provided both diesel generator sets are on the same train (i.e., IA-A and 2A-A or.IB-B and 2B-B). The requested change to Action a of LCO 3.8.1.1 provides consistency within the LCO as well as consistency with similar LCOs that have actions writi)n with regard to " equipment train" availability.
Justification for Change The operability of the alternating current (ac) power sources during operation ensures that sufficient power will be available to supply the safety-related equipment required for the safe shutdown of the facility and the mitigation-and control of accident conditions within the facility. The requirements of General Design Criterion 17 of Appendix A
- to 10 CFR 50, which specify the minimum independent and redundant ac power sources, continue to be met with the proposed change to LCO 3.8.1.1 Action a.
The action requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The operability of the power sources is consistent with the initial condition assumptions of the safety analyses ar.d power source operable during accident conditions coincident with an assumed loss of offsite' power and single failure of the other onsite at source. The proposed change provides clarification as to the combinations of diesel generators that can be Inoperable simultaneously for 72 hours. The combinations are trained to provide consistency within LCO 3.8.1.1 as well as with other LCOs that are based on trained equipment. This TS change will make the diesel generator LCO consistent with LCO 3.7.4, " Essential Raw Cooling Water System (ERCH)" for Unit 1. LCO 3.7.4 provides a 72-hour period for recovery from a loss of one train of ERCW. The Unit 1 ERCH
~=.. ... t.x u e iL. ' headers provide the primary cooling water supply for both the Unit 1 and Unit 2 diesel generators (the 1A'ERCH header supplies the IA-A and 2A-A
. diesel generators and the 1B ERCH header suppl'?s the IB-B and 2B-B diesel '
generators) as can be'seen,on final Safety Analysis Report' figure 9.2,2-1. 'Therefore, under the.present SQN TS, the action time for a LUnit 1 ERCH header outage would be limited by LCOs 3,8,1.1 and 3.0,3
- .because of the. operability requirements for the diesel generators.
' Environmental' impact Eval'uat1on The pro'posid change request does not involve an unreviewed environmental l question because operation of SQN Units 1 and 2 in accordance with this change would not:
- 1. Result in a significant increase in any adverse environmental impact previously evaluated in the final Environmental Statement (fES) as modified by the Staff's testimony to the Atomic Safety and Licensing Board,' supplements to the FES, environmental impact appralgals, or
," -decisions of the Atomic Safety and Licensing Board, 2, Result in a-significant change in effluents or power levels,
- 3. Result'tr matters not previously reviewed in the licensing basis for
=SQN that may have a significant environmental impact.
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e ENCLOStJRE 3 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 or consequences of an accident previously evaluated. The proposed revision to LCO 3.8.1.1 Action a provides an action for ; diesel generator inoperability based on power trains rather than ! individual diesel generator sets. The requirements of General Design li Criteria 17 of' Appendix A to 10 CFR 50, which specifies the minimum independent and redundant ac power sources, continue to be met by the proposed revision. The action requirements specified for the levels-of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The operability of the power sources is consistent with the initial condition assumptions of the safety analyses and is based , upon maintaining at least one onsite ac power source operable during j accident conditions with an assumed loss of offsite power and single : failure of the other onsite ac source. This change has no impact on 1 the probability or consequences of any accident previously evaluated. l (2) Create the possibility of a new or different kind of accident from any previously analyzed, j The proposed revision to LCO 3.8.1.1 Action a provides an action for 1 diesel generator inoperability based on power trains rather than individual diesel generator sets. No physical plant modification is l being made, and no analyses are being changed. Therefore, the I proposed change does not create the possibility of a new or different l' kind of accident from any previously analyzed. (3) Involve a significant reduction in a margin of safety. The proposed revision to LCO 3.8.1.1 Action a provides an action for diesel generator inoperability based on power trains rather than individual diesel generator sets. No physical plant modification is ' being made, and no analyses are being changed. The action requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The operaillity of the power sources is consistent with the initial condition assumptions of the safety analyses and is based upon maintaining at least one onsite ac power source operable during accident conditions coincident with ; an assumed loss of offsite power and single failure of the other onsite at source. Therefore, the proposed change does not involve a reduction in any margin of safety. j l l I ( 4 L_ ;. _
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