ML20149K334
| ML20149K334 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 05/28/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1984-003-00 | |
| Download: ML20149K334 (5) | |
Text
PRECURSOR DESCRIPTION SHEET LER No.:
333/84-003 Event
Description:
RCIC Inoperable While HPCI Is Out of Service Date of Event:
February 7, 1984 Plant:
Fitzpatrick EVENT DESCRIPTION Sequence During normal full-power operation the HPCI system was intention-ally removed from service to permit maintenance and,:.modification.ý Before its removal, completion of surveillance required by Technical Specifications had demonstrated the ADS, RCIC, LPCI, and both CS systems to be operable.
While the HPCI system was out of service, the RCIC system was made inoperable by a personnel error.
Corrective Action Corrective action to reduce the probability of recurrence includes disciplinary action for the persons involved, implementation of a pro-.,
gram to verify that employees are knowledgeable of the equipment they work on, continuation of plant-specific BWR technology/training, and labeling of certain plant equipment.
Plant/Event Data Systems Involved:
HPCI, RCIC Components and Failure Modes Involved:
RCIC -
made inoperable HPCI -
out for maintenance Component Unavailability Duration:
10 h Plant Operating Mode:
1 (100% power)
Discovery Method:
During maintenance Reactor Age:
10.2 years Plant Type:
BWR Event Identifier:
333/84-003 D-1 54
Comments None MODELING CONSIDERATIONS AND DECISIONS Initiators Modeled and Initiator Nonrecovery Estimate Postulated tran-Base case sient, LOOP, and small-break LOCA Branches Impacted'and Branch Nonrecovery Estimate HPCI 1.0 No potential recovery assumed RCIC 0.34 Assumed recoverable locally at equip-me nt Plant Models Utilized BWR'plant Class'C Event Identifier:
333/84-003 D-155
CONDITIONAL CORE DAMlAGE PROBABILITY CALCULATIONS Event Identifier: 333/84-003 Event
Description:
RCIC Inoperable While HPCI Is Out of Service Event Date:
2/7/84 Plant:
Fitzpatrick UNAVAILABILITY, DURATION= 10 NON-RECOVERABLE INITIATING EVENT PROBABILITIES TRANS LOOP LOCA SEQUENCE CONDITIONAL PROBABILITY SUIMS End State/Initiator 1.1E-02 4.4E-05 1.1E-05 Probabil~ity CV TRANS LOOP LOCA Total 4.,3E-08 5
.6E-09 1.3E-09 5.OE-08 CD TRANS Loop LOCA Total 1.OE-06 1.1E-07 1.6E-07 1.3E-06 ATWS TRANS LOOP LOCA Total 0.0E+00 0.0E+00 0.OE+00 0.0E400 DOMINANT SEQUENCES End State: CV Conditional Probability:
2.4E-08 Event Identifier: 333/B4-003 D-156
134 TRANS SCRAM -SLC.OR.RODS PCS/TRANS -SRV.CLOSE FW/PCS.TRANS HPCI RCIC/TRANS.OR.LOOP -SRV.ADS
-COND/FW.PCS -RHR (SBC)
End State: CD Conditional Probability:
7.8E-07 119 TRANS -SCRAM PCS/TRANS SRV.CHALL/TRANS.-SCRAM SRV.CLOSE FW/PCS.LOCA HPCI RCIC/LOCA SRV.ADS SEQUENCE CONDITIONAL PROBABILITIES Sequence End State Prob N Rec**
110 TRANS -SCRAM PCS/TRANS SRV.CHALL/TRANS.-SCRAM -SRV.CLOSE F#J CD 2.3E-07 1.2E-01
/PCS.TRANS HPCI RCIC/TRANS.OR.LOOP CRD SRV.ADS 119 TRANS -SCRAM PCS/TRANS SRV.CHALL/TRANS.-SCRAM SRV.CLOSE FW CD 7.8E-07
- 3.4E-01
/PCS.LOCA HPCI RCIC/LOCA SRV.ADS 134 TRANS SCRAM -SLC.OR.RODS PCS/TRANS -SRV.CLOSE FW/PCS.TRANS CV 2.4E-08
- 7.6E-02 HPCI RCIC/TRANS.OR.LOOP -SRV.ADS -COND/FW.PCS -RHR(SDC) 138 TRANS SCRAM -SLC.OR.RODS PCS/TRANS -SRV.CLOSE FW/PCS.TRANS CV 1.2E-08 3.9E-02 HPCI RCIC/TRANS.OR.LOOP -SRV.ADS COND/FW.PCS -LPCS -RHR(
SDC) 155 TRANS SCRAM -SLC.OR.RODS PCS/TRANS SRV.CLOSE FW/PCS.LOCA CV 4.E-09 2.2E-01 HPCI RCIC/LOCA -SRV.ADS -COND/FW.PCS -RHR(SDC) 159 TRANS SCRAM -SLC.OR.RODS PCS/TRANS SRV.CLOSE FW/PCS.LOCA CV 2.1E-09 1.1E-01 HPCI RCIC/LOCA -SRV.ADS COND/FW.PCS -LPCS -RHR (SDC) 208 LOOP -EMERG.POWER -SCRAM SRV.CHALL/LOOP.-SCRAtI -SRV.CLOSE HP CD 3.4E-08 1
.2E-01 CI RCIC/TRANS.OR.LOOP CR0 SRV.ADS 215 LOOP -EMERG.POI4ER -SCRAM SRV.CHALL/LOOP.-SCRAM SRV.CLOSE HP CD 5.2E-08 3.4E-01 CI RCIC/LOCA SRV.ADS 226 LOOP -EMERG.POWER SCRAM -SLC.OR.RODS HPCI RCIC/TRANS.OR.LOO CV 5.5E-09 1.1E-01 P -SRV.ADS -LPCS -RHR(SDC) 310 LOCA -SCRAM PCS/LOCA FW/PCS.LOCA HPCI RCIC/LOCA SRV.ADS CD 1.6E-07 1.2E-01 314 LOCA SCRAM -SLC.OR.RODS PCS/LOCA FW/PCS.LOCA HPCI -SRV.ADS CV 8.6E-10 7.6E-02
- dominant sequence for end state
- non-recovery credit for edited case Note: For unavailabilities, conditional probability values are differential values which reflect the added risk due to failures associated with an event. Parenthetical values indicate a reduction in risk compared to a similar period without the existing failures.
MODEL:
b :\\bwrctree.cmp DATA:
b:\\fitzprob.cmp No Recovery Limit BRANCH FREQUENCIES/PRO)BABILITIES Branch System Non-Recov Opr Fail Event Identifier: 333/84-003 D-1 157
TRANS LOOP LOCA SCRAM SLC.OR.RODS PCS/TRANS PCS/LOCA SRV.CHALL/TRANS.-SCRAM SRV.CHALL/TRANS.SCRAM SRV.CHALL/LOOP.-SCRAM SRV.CHALL/LOOP.SCRAM SRV.CLOSE EMERG.POWER FW/PCS.TRANS FW/PCS.LG0A HPCI Branch Model: 1.OF.1 Train I Cond Prob:
RCIC/TRANS.OR.LOOP Branch Model:
1.O1'.1 Train I Cond Prob:
RCIC/LOCA CR13 BRY ADS COND/FW.PCS LPCS LPCI(RHR)/LPCS RHRSW/LPCS.LPCI.TRANS RHRSW/LPCS.LPCI.LOOP RHRSW/LPCS.LPCI.LOCA RHR (SDC)
RHR (SOC) I-LPCI RHR (6130)/LPCI RHR(SPCOOL)I-LPCI.RHR(SDC)
RHR(SPCOOL)/LPCI.RHR(SDC) 0.1.AND.Y/RHR(SBC).RHR(SPCOOL)
- forced Minarick 04-1 1-1987 17:28:17 Event Identifier: 333/84-003' 1.1E-03 1.3E-05 3.3E-06
- 4. 1E-04 1.0E-02 I.E-01 I.OE+00
- 1.
OE+00 1.OE+00 1.OE+00 1.OE+00 2.7E-02 2.9E-03 4.6E-01 I.0E+00 1.OE-01 > 1.OE+OO 1.0E-01 > Unavailable 6.7E-02 > 1.OE+OO
- 1.
OE+00 3
.4E-01 3.4E-01 1.OE+00 1.0E+00 I.OE+00 1.OE+O0 1.OE+00 1.OE+00 I.OE+00 1.OE+00 1.OE+00 5.1E-01 3.4E-01 3.4E-01 5.7E-01 >'
1.0E+00 5.7E-01 2' 3.4E-01 4.OE-02 6.7E-02 I.OE+00 1.OE-02 6.7E-03 1.OE+00 3.OE-03 4.OE-04 5.OE-01 5.OE-01 5.OE-01 2.OE-02 2.OE-02 1.0OE+00 2.DE-02 5.2E-01 1.OE+00 Unavailable 1.OE+00 I OE+00 1.OE+00 3.4E-01 3.4E-01 3.4E-01 I.OE+00 1.OE+00 1.OE+00 3.4E-01 3.4E-01 1.OE+00 1.OE+00 1.0E+00 3
.4E-01 4.OE-02 4.DE-02 4.OE-02
- 4. OE-02 4.OE-02 D-158