ML13308B487
| ML13308B487 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/10/1976 |
| From: | Ottoson H SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| RO-76-22, NUDOCS 8103060527 | |
| Download: ML13308B487 (1) | |
Text
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~ICENSEE EVENT REPORT CONTROL BLOCK:
(PLEASE PRINT ALL REQUIRED INFORMATION]
1 6
LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE l1 Ic IA IS 0 I l 0 0 -1010 01 01_10 10 110 13 4 0 j 0 L 1L 7
89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER
'EVENT DATE REPORT DATE 01CONT [LU LI LLJ 10 10 1--10 12 10 16 10 18 12 13 17 16 1 01 91 11 017 16 1 7
8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION IDuring normal operations, Number 1 vital bus transferred to its backup power source, 7 8 9 80 703 Iwhich precipitated the transfer of all three feedwater control systems to their backup l 7
8 9-80 4 Ipower supplies. The backup power supply for the feedwater control system was deqraded, 7
8 9 80 05 land under these circumstances, the steam feedwater flow mismatch reactor trip was I
7
- 89.
80 M) 9inoperable. Feedwater control was immediately transferred back to its normal power 1
7 8 9 PRIME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIDLATION i
l) Aj [E]
I IN IS IT RI U -,--LNJ I Iw lj I1lo 1 LNU 7
8 9 10 11 12 17
- 43.
44 47 48 CAUSE DESCRIPTION 0 8i The steam generator feedwater control system backup power supply failure was caused 7
8 9 8
[og -by the failure of bridge rectifier diodes in the fifteen volt supply. The power 7
8 9 8
70 Isupply was repaired.
89 80 FACILITY METHOD OF 80 STATUS
% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION
[EJ 10 181 31 I NA I LaJ I
NA 7
8 9
10 12 13 44 45 46 80 FORM OF ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Lz I z I NA NA 7
8 9
10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 13 1010101 LA I
. N 7
8 9 11 12
.13 80 PERSONNEL INJURIES NUMBER DESCRIPTION S1 01 01 NA 7
8,9 11 12 80 OFFSITE CONSEQUENCES El I NA 7
8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION L
I NA I
7 8 9 10 80 PUBLICITY 717 IEvent released to standard publicity list.
7 8 9 80 ADDITIONAL FACTORS (Event Desdription continued) 718 Isupply. Redundant systems were not available. This event is nonrepetitive.
7 8 9 80 Reference Station Incident 76-22.
19.
7 8 9AM H. L. Ottoson PHONE:(714) 492-7700 so n
(01 7
GPO 881.667