ML20168A559
| ML20168A559 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1975-LTR-00 | |
| Download: ML20168A559 (4) | |
Text
PRECURSOR DESCRIPTION AND DATA NSIC Accession Number:
104379 Date:
July 3, 1975
Title:
Earthquake Occurs at Humboldt Bay The failure sequence was:
- 1. Humboldt Bay was shutdown for refueling.
- 2. An earthquake of.36 g occurred at the plant.
- 3. The plant was inspected and no damage was identified.
Corrective action:
None Design purpose of failed systemn or component:
N.A.
Unavilailiy ofsysem er WSH 400 Unavailability of systoemt per WASH 1400:-
Unavailabilities are in units of per demand D-1.
Failure rates are in units of per hour HR-1.
IThe Plant Was A.36 g.Earthquake Plant Safety Shutdown For Occurs At The Systems Refueling Plant Site Damaged Potential Severe Core Da mag e No plant shutdown No No NSIC 104379 -
Actual Occurrence of Earthquake Occurs at Humboldt Bay
Earthquake Design Bases Transients Engineered Safety Potential or Greater Initiated Systems Success Severe Core Damage No Yes till 411111114No No NSIC 104379 -
Sequence of Interest.for Earthquake occurrence at Humboldt Bay
CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS NSIC ACCESSION NUMBER:
104379 DATE OF LER:
July 3, 1975 DATE OF EVENT: June 7, 1975 SYSTEM INVOLVED:
N.A.
COMPONENT INVOLVED:
N.A.
CAUSE:
Earthquake SEQUENCE OF INTEREST:
Unique ACTUAL OCCURRENCE:
Earthquake occurs at Humboldt Bay REACTOR NAME:
Humboldt Bay DOCK<ET NUMBER:
50-133 REACTOR TYPE: BWR DESIGN ELECTRICAL RATING:
50 MWe REACTOR ACE:
12.4 yr VENDOR:
General Electric ARCHITECT-ENGINEERS:
Bechtel OPERATORS:
Pacific Gas & Electric LOCATION:
Four miles South of Eureka DURATION:
N/A PLANT OPERATING CONDITION:
shutdown SAFETY FEATURE TYPE OF FAILURE:
(a) inadequate performance; (b) failed to start; (c) made inoperable; (d)____________
DISCOVERY METHOD:
plant transient COMMENT:
Operating basis is.25 g, the acceleration of experiment by the plant was.36 g.