ML19350E049: Difference between revisions
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{{#Wiki_filter:. U. S. NUCLE AR 0 E E ULATZ RY COMMISSION 96RC FORM 3G6 | {{#Wiki_filter:. U. S. NUCLE AR 0 E E ULATZ RY COMMISSION 96RC FORM 3G6 | ||
'.77) | '.77) | ||
LICENSEE EVENT REPORT CONTR')L SLOCK: l l l l \ l lh (PLE ASE PRINT OR TYPE ALL CECUIIEJ IZFORMATION) foII)8 9 lHlDlBlSl1l@l 0l 0l -] 0lLICENSE 0] 0] 0] 0l -l 0l 0l@l 23 26 4[ 1l LICENSE 1l 1l 1l@l TvPE J1 l | LICENSEE EVENT REPORT CONTR')L SLOCK: l l l l \ l lh (PLE ASE PRINT OR TYPE ALL CECUIIEJ IZFORMATION) foII)8 9 lHlDlBlSl1l@l 0l 0l -] 0lLICENSE 0] 0] 0] 0l -l 0l 0l@l 23 26 4[ 1l LICENSE 1l 1l 1l@l TvPE J1 l | ||
SI LAI 3d l@ | SI LAI 3d l@ | ||
3 LICENSEE CODE 14 15 NuMdEH 0C'.*T | 3 LICENSEE CODE 14 15 NuMdEH 0C'.*T 7 | ||
o i 3 | |||
5sRM 60 | 5sRM 60 | ||
: 11. )@l 0CoCnET el l 5NUMBER l 0 l 01013 l 416 )@l 01511 l 218 6d b9 EVEN1 OATE F4 75 l 1 l@l 01 61 01 REPoHTDATE #J EVENT OESCRIPTION AND PROS ABLE CONSEQUENCES h lo12l l (NP-33-81-33) On 5/12/81 at 1408 hours, the axial power imbalance limit was exceeded. I Prior to the event, reactor I g l placing the unit in the action statement of T.S. 3.2.1. | : 11. )@l 0CoCnET el l 5NUMBER l 0 l 01013 l 416 )@l 01511 l 218 6d b9 EVEN1 OATE F4 75 l 1 l@l 01 61 01 REPoHTDATE #J EVENT OESCRIPTION AND PROS ABLE CONSEQUENCES h lo12l l (NP-33-81-33) On 5/12/81 at 1408 hours, the axial power imbalance limit was exceeded. I Prior to the event, reactor I g l placing the unit in the action statement of T.S. 3.2.1. | ||
Line 30: | Line 28: | ||
2-1. There was no dangerl g l due to an earlier seal failure on Reactor Coolant Pump (RCP) o e Ito the public or station personnel. The reactor operators restored axial power imbal-1 l | 2-1. There was no dangerl g l due to an earlier seal failure on Reactor Coolant Pump (RCP) o e Ito the public or station personnel. The reactor operators restored axial power imbal-1 l | ||
g lance within limits within the time allotted by the T.S. action statement. | g lance within limits within the time allotted by the T.S. action statement. | ||
I 10181 I so CO E SLSC E COYPoNENT CODE SUSCoOE S E OE 8 IR{Bl@ y @ J @ lZlZjZlZlZlZl@ W @ y @ | I 10181 I so CO E SLSC E COYPoNENT CODE SUSCoOE S E OE 8 IR{Bl@ y @ J @ lZlZjZlZlZlZl@ W @ y @ | ||
9 to II IJ 13 18 19 20 7 8 REPORT REVISION SE QUENTI AL OCCURRENCE | 9 to II IJ 13 18 19 20 7 8 REPORT REVISION SE QUENTI AL OCCURRENCE REPORT NO. CODE TYPE No. | ||
REPORT NO. CODE TYPE No. | |||
LE R IVENT YEAR | LE R IVENT YEAR | ||
@ ,a y ,Ro g I8l1] l_l l 0l 3l 0l [f_] l0I3i 23 29 Lhl 30 I-I 31 LO_J 32 | @ ,a y ,Ro g I8l1] l_l l 0l 3l 0l [f_] l0I3i 23 29 Lhl 30 I-I 31 LO_J 32 | ||
Line 41: | Line 36: | ||
TK A C f T lX l g ]34g Z | TK A C f T lX l g ]34g Z | ||
[JS_ _j g [46Zj@ l 0 l 0l 01 l lYl@ | [JS_ _j g [46Zj@ l 0 l 0l 01 l lYl@ | ||
46 | 46 4 44 47 JJ 3 40 42 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS g lThe cause of this occurrence is procedural inadequacy. Procedures ST 5042.02 and I | ||
4 44 47 JJ 3 40 42 | |||
, , EP 1205.16. "RCP and Motor Emergency Procedure" do not provido proper nuideline9 as to I g lwhen ST 5042.02 should be stopped to avoid exceeding axial power imbalance limits dur- l g ling a xenon transient. Procedures ST 5042.02 a d EP 1205.16 have been modified. I 1 | , , EP 1205.16. "RCP and Motor Emergency Procedure" do not provido proper nuideline9 as to I g lwhen ST 5042.02 should be stopped to avoid exceeding axial power imbalance limits dur- l g ling a xenon transient. Procedures ST 5042.02 a d EP 1205.16 have been modified. I 1 | ||
i 4 1 so T eo OTHER STATUS IS O R O'SCoVERY OESCRiPTION A S % POWE R Observation by reactor operators l i s [E j@ l 1l 0 l 0l@l NA | i 4 1 so T eo OTHER STATUS IS O R O'SCoVERY OESCRiPTION A S % POWE R Observation by reactor operators l i s [E j@ l 1l 0 l 0l@l NA l l''A{@l" " | ||
l l''A{@l" " | |||
A!TiviTY CO0 TENT LOCATION 07 RELEASE @ | A!TiviTY CO0 TENT LOCATION 07 RELEASE @ | ||
i 6 y RELEASE @D OF NARELE AMoVNT ASEgl OF ACTivlTY 44 l | i 6 y RELEASE @D OF NARELE AMoVNT ASEgl OF ACTivlTY 44 l | ||
45 NA @l so l | 45 NA @l so l | ||
1 e s to u PERSONNEL E XPOSURES NUMBER TYPE DESCRIPTION NA l i 7 101010l@[ZJ@l ' | 1 e s to u PERSONNEL E XPOSURES NUMBER TYPE DESCRIPTION NA l i 7 101010l@[ZJ@l ' | ||
' ' ' ,tRSONNE aNmLS NuveER OEscRiPTiON@ l NA 7 | ' ' ' ,tRSONNE aNmLS NuveER OEscRiPTiON@ l NA 7 | ||
i a 8 9 101010 l@l12 11 80 LOSS oF OR DaVAGE To FACILITY TYPE DESCRIPTION l | i a 8 9 101010 l@l12 11 80 LOSS oF OR DaVAGE To FACILITY TYPE DESCRIPTION l | ||
Line 66: | Line 53: | ||
' 8 8 4 'I 0 616 e 3 45 oW | ' 8 8 4 'I 0 616 e 3 45 oW | ||
~ | ~ | ||
DVR 81-067 a , | |||
PHONE: | PHONE: | ||
NAME OF PHEPAHLH _ | NAME OF PHEPAHLH _ | ||
TOLEDG EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL-INFORMATION FOR LER NP-33-81-33 | |||
TOLEDG EDISON COMPANY | |||
DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL-INFORMATION FOR LER NP-33-81-33 | |||
.e DATE OF EVENT: May 12, 1981 FACILITY: Davis-lesse Unit l' IDENTIFICATION OF OCCURRENCE:- Axial Power Imbalance Limitt. Exceeded With Reactor Power Greater Than 40% | .e DATE OF EVENT: May 12, 1981 FACILITY: Davis-lesse Unit l' IDENTIFICATION OF OCCURRENCE:- Axial Power Imbalance Limitt. Exceeded With Reactor Power Greater Than 40% | ||
Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2031 | Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2031 and Load (Gross NWE) = 680 Description of Occurrence: During the late morning and early afternoon of May'12, 1981, reactor operators were performing ST 5042.02; " Reactor Coolant System (RCS) , | ||
and Load (Gross NWE) = 680 Description of Occurrence: During the late morning and early afternoon of May'12, 1981, reactor operators were performing ST 5042.02; " Reactor Coolant System (RCS) , | |||
Water Inventory Balance" (as required by EP 1202.16, " Reactor Coolant Pump and Motor EmergencyL Procedure") due to a seal failure on Re' actor Coolant Pump (RCP) 2-1 which had occurred ecrlier in the day. Prior to taking RCP 2-1 out of service, reactor power had to be reduced from approximately 100% to 75%. The ensuing xenon transient drove in control rods causing axial power imbalance to go increasingly negative. This effect had to be countered by RCS boration to maintain axial power imbalance within its Technical Specification limits. | Water Inventory Balance" (as required by EP 1202.16, " Reactor Coolant Pump and Motor EmergencyL Procedure") due to a seal failure on Re' actor Coolant Pump (RCP) 2-1 which had occurred ecrlier in the day. Prior to taking RCP 2-1 out of service, reactor power had to be reduced from approximately 100% to 75%. The ensuing xenon transient drove in control rods causing axial power imbalance to go increasingly negative. This effect had to be countered by RCS boration to maintain axial power imbalance within its Technical Specification limits. | ||
In order to perform ST 5042.02 successfully, the RCS has to be maintained as close as possible. to steady state conditions. This entails, among other things, that no additions of boric acid or water to the RCS be made during this test. . | In order to perform ST 5042.02 successfully, the RCS has to be maintained as close as possible. to steady state conditions. This entails, among other things, that no additions of boric acid or water to the RCS be made during this test. . | ||
At 1402 hours on May- 12, 1981, the reactor operators, realizing that axial power im-balance was approaching its Technical Specification limit, stopped ST 5042.02 and injected 30 gallons of boric acid into the RCS. At 1408 hours on May 12, 1981,-the axial power imbalance Technical Specification limit was exceeded. The reactor opera-tors inserted axial power shaping rods (APSRs) 1% (to 24% withdrawn) and, as a result, axial power imbalance was brought back within limits at 1420 hours on May 12, 1981. | At 1402 hours on May- 12, 1981, the reactor operators, realizing that axial power im-balance was approaching its Technical Specification limit, stopped ST 5042.02 and injected 30 gallons of boric acid into the RCS. At 1408 hours on May 12, 1981,-the axial power imbalance Technical Specification limit was exceeded. The reactor opera-tors inserted axial power shaping rods (APSRs) 1% (to 24% withdrawn) and, as a result, axial power imbalance was brought back within limits at 1420 hours on May 12, 1981. | ||
Exceeding axial power imbalance limits picced the unit in the action statement of Tech-nical Specification 3.2.1 which states that while in Mode 1 and E 40% rated thermal power, with axial power imbalance exceeding the linits specified on figure 3.2-2a of the Technical Specifications, axial power imbalance must be restored to within its Technical Specification limits within 15 minutes or be in hot standby within 2 hours. | Exceeding axial power imbalance limits picced the unit in the action statement of Tech-nical Specification 3.2.1 which states that while in Mode 1 and E 40% rated thermal power, with axial power imbalance exceeding the linits specified on figure 3.2-2a of the Technical Specifications, axial power imbalance must be restored to within its Technical Specification limits within 15 minutes or be in hot standby within 2 hours. | ||
Line 96: | Line 72: | ||
'ST 5042.02' unconditionally. | 'ST 5042.02' unconditionally. | ||
LER #81-030 | LER #81-030 | ||
F | F p | ||
p | |||
TOLEDO EDISON COMPANY ' | TOLEDO EDISON COMPANY ' | ||
DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTARY INFORMATION FOR LER NP-33-81-33 , | DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTARY INFORMATION FOR LER NP-33-81-33 , | ||
Line 110: | Line 82: | ||
Corrective Action: At 1402 hours on May 12, 1981, the reactor operators, realizing that axial power imbalance was approaching its Technical Specification limits, in-jected 30 gallons of boric acid into the RCS. After the axial power imbalance limits were exceeded, the operators inserted APSRs 1% (to 24% withdrawn). The combination cf boric acid addition and APSR insertion restored axial power imbalance within limits ct 1420 hours on May 12, 1981. | Corrective Action: At 1402 hours on May 12, 1981, the reactor operators, realizing that axial power imbalance was approaching its Technical Specification limits, in-jected 30 gallons of boric acid into the RCS. After the axial power imbalance limits were exceeded, the operators inserted APSRs 1% (to 24% withdrawn). The combination cf boric acid addition and APSR insertion restored axial power imbalance within limits ct 1420 hours on May 12, 1981. | ||
EP 1202.16 has been modified (per modification T-5561) to add guidance for the reac-tor operators when performing ST 5042.02. ST 5042.02 has been modified (per modifica-tion T-5560) to ;ive reactor operators special guidance when performing this test during xenon transient conditions. | EP 1202.16 has been modified (per modification T-5561) to add guidance for the reac-tor operators when performing ST 5042.02. ST 5042.02 has been modified (per modifica-tion T-5560) to ;ive reactor operators special guidance when performing this test during xenon transient conditions. | ||
Failure Data: There have been no previous similar events. | Failure Data: There have been no previous similar events. | ||
LER f 81-030 . | LER f 81-030 . |
Latest revision as of 03:48, 18 February 2020
ML19350E049 | |
Person / Time | |
---|---|
Site: | Davis Besse ![]() |
Issue date: | 06/09/1981 |
From: | David Brown TOLEDO EDISON CO. |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
Shared Package | |
ML19350E041 | List: |
References | |
LER-81-030-03L, LER-81-30-3L, NUDOCS 8106160345 | |
Download: ML19350E049 (3) | |
Text
. U. S. NUCLE AR 0 E E ULATZ RY COMMISSION 96RC FORM 3G6
'.77)
LICENSEE EVENT REPORT CONTR')L SLOCK: l l l l \ l lh (PLE ASE PRINT OR TYPE ALL CECUIIEJ IZFORMATION) foII)8 9 lHlDlBlSl1l@l 0l 0l -] 0lLICENSE 0] 0] 0] 0l -l 0l 0l@l 23 26 4[ 1l LICENSE 1l 1l 1l@l TvPE J1 l
SI LAI 3d l@
3 LICENSEE CODE 14 15 NuMdEH 0C'.*T 7
o i 3
5sRM 60
- 11. )@l 0CoCnET el l 5NUMBER l 0 l 01013 l 416 )@l 01511 l 218 6d b9 EVEN1 OATE F4 75 l 1 l@l 01 61 01 REPoHTDATE #J EVENT OESCRIPTION AND PROS ABLE CONSEQUENCES h lo12l l (NP-33-81-33) On 5/12/81 at 1408 hours0.0163 days <br />0.391 hours <br />0.00233 weeks <br />5.35744e-4 months <br />, the axial power imbalance limit was exceeded. I Prior to the event, reactor I g l placing the unit in the action statement of T.S. 3.2.1.
g l operators were performing ST 5042.02, " Reactor Coolant System Water Inventory Balance"!
2-1. There was no dangerl g l due to an earlier seal failure on Reactor Coolant Pump (RCP) o e Ito the public or station personnel. The reactor operators restored axial power imbal-1 l
g lance within limits within the time allotted by the T.S. action statement.
I 10181 I so CO E SLSC E COYPoNENT CODE SUSCoOE S E OE 8 IR{Bl@ y @ J @ lZlZjZlZlZlZl@ W @ y @
9 to II IJ 13 18 19 20 7 8 REPORT REVISION SE QUENTI AL OCCURRENCE REPORT NO. CODE TYPE No.
LE R IVENT YEAR
@ ,a y ,Ro g I8l1] l_l l 0l 3l 0l [f_] l0I3i 23 29 Lhl 30 I-I 31 LO_J 32
_ 21 22 23 24 26 27 HOURS 22 58 af O FOR > 8. SUPPL ER MAN ACTuaER c PLANT
[N jg l3Zl@ l q 9l 9l q@
TK A C f T lX l g ]34g Z
[JS_ _j g [46Zj@ l 0 l 0l 01 l lYl@
46 4 44 47 JJ 3 40 42 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS g lThe cause of this occurrence is procedural inadequacy. Procedures ST 5042.02 and I
, , EP 1205.16. "RCP and Motor Emergency Procedure" do not provido proper nuideline9 as to I g lwhen ST 5042.02 should be stopped to avoid exceeding axial power imbalance limits dur- l g ling a xenon transient. Procedures ST 5042.02 a d EP 1205.16 have been modified. I 1
i 4 1 so T eo OTHER STATUS IS O R O'SCoVERY OESCRiPTION A S % POWE R Observation by reactor operators l i s [E j@ l 1l 0 l 0l@l NA l lA{@l" "
A!TiviTY CO0 TENT LOCATION 07 RELEASE @
i 6 y RELEASE @D OF NARELE AMoVNT ASEgl OF ACTivlTY 44 l
45 NA @l so l
1 e s to u PERSONNEL E XPOSURES NUMBER TYPE DESCRIPTION NA l i 7 101010l@[ZJ@l '
' ' ' ,tRSONNE aNmLS NuveER OEscRiPTiON@ l NA 7
i a 8 9 101010 l@l12 11 80 LOSS oF OR DaVAGE To FACILITY TYPE DESCRIPTION l
o (Z j@l NA
_ so 7 8 9 10 Pust Ci7 NRC USE ONLY ,
,7 lllllllllllll$
8 [N. @9) NA
- l
" " " 5
' 8 8 4 'I 0 616 e 3 45 oW
~
DVR 81-067 a ,
PHONE:
NAME OF PHEPAHLH _
TOLEDG EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL-INFORMATION FOR LER NP-33-81-33
.e DATE OF EVENT: May 12, 1981 FACILITY: Davis-lesse Unit l' IDENTIFICATION OF OCCURRENCE:- Axial Power Imbalance Limitt. Exceeded With Reactor Power Greater Than 40%
Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2031 and Load (Gross NWE) = 680 Description of Occurrence: During the late morning and early afternoon of May'12, 1981, reactor operators were performing ST 5042.02; " Reactor Coolant System (RCS) ,
Water Inventory Balance" (as required by EP 1202.16, " Reactor Coolant Pump and Motor EmergencyL Procedure") due to a seal failure on Re' actor Coolant Pump (RCP) 2-1 which had occurred ecrlier in the day. Prior to taking RCP 2-1 out of service, reactor power had to be reduced from approximately 100% to 75%. The ensuing xenon transient drove in control rods causing axial power imbalance to go increasingly negative. This effect had to be countered by RCS boration to maintain axial power imbalance within its Technical Specification limits.
In order to perform ST 5042.02 successfully, the RCS has to be maintained as close as possible. to steady state conditions. This entails, among other things, that no additions of boric acid or water to the RCS be made during this test. .
At 1402 hours0.0162 days <br />0.389 hours <br />0.00232 weeks <br />5.33461e-4 months <br /> on May- 12, 1981, the reactor operators, realizing that axial power im-balance was approaching its Technical Specification limit, stopped ST 5042.02 and injected 30 gallons of boric acid into the RCS. At 1408 hours0.0163 days <br />0.391 hours <br />0.00233 weeks <br />5.35744e-4 months <br /> on May 12, 1981,-the axial power imbalance Technical Specification limit was exceeded. The reactor opera-tors inserted axial power shaping rods (APSRs) 1% (to 24% withdrawn) and, as a result, axial power imbalance was brought back within limits at 1420 hours0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br /> on May 12, 1981.
Exceeding axial power imbalance limits picced the unit in the action statement of Tech-nical Specification 3.2.1 which states that while in Mode 1 and E 40% rated thermal power, with axial power imbalance exceeding the linits specified on figure 3.2-2a of the Technical Specifications, axial power imbalance must be restored to within its Technical Specification limits within 15 minutes or be in hot standby within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
The total time.that the axial power imbalance Technical Specification limit was ex-ceeded was 12 minutes.
Designation of Apparent Cause of Occurrence: The cause of this occurrence is pro-cedural inadequacy. Procedures EP 1202.16 and ST 5042.02 do not provide proper guidance to the reactor operators during a xenon transient for determining when ST 5042.02 should be performed, how long it should be run, and when, if necessary,
'it should.be't.rminated e to avoid exceeding axial power imbalance limits. EP 1202.16 also has conflicting supplementary action steps. Step 1.4.2 suggests running
~
)
ST-5042.02 if idle RCP total seal flow exceeds 2 GPM. Step 1.4.3 suggests running
'ST 5042.02' unconditionally.
LER #81-030
F p
TOLEDO EDISON COMPANY '
DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTARY INFORMATION FOR LER NP-33-81-33 ,
PAGE 2 p
Analysis'of Occurrence: There was no danger to the health and safety of'the public -
cr to a?,ation personnel. The reactor operators took corrective action to reverse the trend of the axial power imbalance before the axial power imbalance technical specif* ation limit was exceeded and as a result of this action, restored axial power Ambalance within limits within the time allotted by the technical specifica-tion action statement. No safety limits were exceeded as maximum axial power in-balance was -6.1%. The technical specification axial power imbalance limit for.
this power history, power level, and RCP combination is -5.8%. -
Corrective Action: At 1402 hours0.0162 days <br />0.389 hours <br />0.00232 weeks <br />5.33461e-4 months <br /> on May 12, 1981, the reactor operators, realizing that axial power imbalance was approaching its Technical Specification limits, in-jected 30 gallons of boric acid into the RCS. After the axial power imbalance limits were exceeded, the operators inserted APSRs 1% (to 24% withdrawn). The combination cf boric acid addition and APSR insertion restored axial power imbalance within limits ct 1420 hours0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br /> on May 12, 1981.
EP 1202.16 has been modified (per modification T-5561) to add guidance for the reac-tor operators when performing ST 5042.02. ST 5042.02 has been modified (per modifica-tion T-5560) to ;ive reactor operators special guidance when performing this test during xenon transient conditions.
Failure Data: There have been no previous similar events.
LER f 81-030 .
m 4
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