ML20168A719
| ML20168A719 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1975-035-00 | |
| Download: ML20168A719 (4) | |
Text
PRECURSOR DESCRIPTION AND DATA NSIC Accession Number:
106333 Date: August 30, 1975
Title:
HPCI Found Inoperable at Quad Cities 2 The failure sequence was:
- 1. The RCIC system had failed for reasons unspecified.
- 2. A test was initiated to determine the operability of HPCI
- 3. This test revealed that HPCI was also inoperable due to a broken auxiliary oil pump lime.
- 4. Since both RCIC and HPCI were inoperable am orderly shutdowm was initiated.
Corrective action:
- 1. The reactor was shutdown in an orderly fashion.
- 2. The HPCI auxiliary oil pump line was replaced with the sarae type of line.
Design purpose of failed system or component:
- 2. HPCI provides emergency cooling water-when the system pressure is above the LPCI and CS operating pressures.
- 3. The auxiliary oil pump provides lubrication to the HPCI turbine prior to initiation of the turbine driven lube oil pump.
Unavailability of system per WASH 1400:
- RpCm 8.8 x 10-2 /D Unavailability of component per WASH 1400:
- pump failure to start:
I x 10-3 /D Unavailabilities are in units of per demand D-1.
Failure rates are in units of per hour HR-1.
RCIC Surveillance testing HPCI Reactor inoperable on HPCI to prove inoperable shutdown operabilityI Potential Severe Core Damage No
-No -ADSILPCI/CS available; however, a violation if Tech. Specs.
-No
-No -ADS/LPCIICS available; however, a violation of Tecl'. Specs.
NSIC 106333 -
Actual Occurrence of HPCI Found Inoperable at Quad Cities 2
Loss of Reactor RCIC/HPCI Automatic LPCI or Long Feedwater Subcritical
Response
Depressurization CS Response Ter Flow Adequate System Operates Adequate Cor Coln Potential Severe C ore Damage Sequence No.
I No Yes 1
2 3
- (F)
No Yes No Yes Yes Yes Yes 5
6 7
NSIC 106333 -
Sequence of Interest for HPCI Found Inoperable at Quad Cities 2
CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS NSIC ACCESSION NUMBER:
106333 DATE OF LER:
September 9, 1975 DATE OF EVENT: August 31, 1975 SYSTEM INVOLVED:
HPCI COMPONENT INVOLVED:
aux lube oil pump CAUSE: broken oil line SEQUENCE OF INTEREST:
loss of feedwater flow ACTUAL OCCURRENCE:
HPCI found inoperable at Quad Cities 2 REACTOR NAME: Quad Cities 2 DOCKET NUMBER:
50-265 REACTOR TYPE:
BWR DESIGN ELECTRICAL RATING:
789 MWe REACTOR AGE:
3.4 yr VENDOR:
General Electric ARCHITECT-ENGINEERS:
Sargent & Lundy OPERATORS: Commonwealth Edison LOCATION:
20 miles NE of Moline DURATION:
360(a) hours PLANT OPERATING CONDITION:
69% power SAFETY FEATURE TYPE OF FAILURE:
(a) inadequate performance; failed to start; (c) made inoperable; (d) ____________
DISCOVERY METHOD:
surveillance testing COMMENT:
-