ML20168A562
| ML20168A562 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1977-003-00 | |
| Download: ML20168A562 (4) | |
Text
PRECURSOR DESCRIPTION AND DATA NSIC Accession Number:
143219 Date: August 4, 1977
Title:
Offsite Power to Station Lost at Indian Point 3 The failure sequence was:
- 1. While at hot shutdown following a reactor trip, offsite power was lost due to severe electrical storms.
- 2. The emergency generators started and assumed required safety-related loads.
Corrective action;
- 1. Offaite power was restored.
Design purpose of failed system or component; Offsite power provides the preferred source of electric power for safety-related loads on this plant.
Unavailability of system per WASH 140G:
- offsite power:
2 x 10-5 /hr Unavailability of component per WASH 1400:*
Unavailabilities are in units of per demand D-1.
Failure rates are in units of per hour HR-1.
Potential Severe Core Damage No No Yes No NSIC 143219 -
Actual Occurrence for Loss of Offsite Power at Indian Point 3
Loss of Turbine Emer-Auxiliary PORV PORV or High Long Offsite Generator gency Feedwater and Demanded PORV Isola-Pressure Term Power Runs Back Power Secondary tion Valve Injection Core and Assumes Heat Removal Closure Cooling House Loads Potential Severe Core Damage Sequence No.
2 3
4 5
6 7
8 9
10 11 12 13 NSIC 143219 -
Sequence of Interest for Loss of Offsite Power at Indian Point 3 not included in mitigation procedures.
CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS NSIC ACCESSION NUMBER:
143219 DATE OF LER: August 4, 1977 DATE OF EVENT:
July 13, 1977 SYSTEM INVOLVED:
Offsite power COMPONENT INVOLVED:
Transmission network CAUSE:
Severe electrical storms SEQUENCE OF INTEREST:
Loss of off site power ACTUAL OCCURRENCE:
Loss of offsite power REACTOR NAME:
Indian Point 3 DOCKET NUMBER:
50-286 REACTOR TYPE:
PWR DESIGN ELECTRICAL RATING:
965
.MWe REACTOR AGE:
1.8 yr VENDOR:
Westinghiouse ARCHITECT-ENGINEERS:
United Engineers & Constructors OPERATORS:
Consolidated Edison Co. of New York LOCATION:.25 -amIle. -se~t" of New York, NY DURATION:
N/A PLANT OPERATING CONDITION:
Hot shutdown SAFETY FEATURE TYPE OF FAILURE:
(a) inadequate performance; (b) failed to start; e
made inoperable; (d)
DISCOVERY METHOD:
During operation COMMENT:
-