ML13308B490
| ML13308B490 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/25/1976 |
| From: | Fogarty D SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 8103060537 | |
| Download: ML13308B490 (2) | |
Text
Southern DAVID J. FOGARTY R
SEMEAD, CA I
TELEPHONE VICE PRESIoNT U. S. Nuclear Regulatory Comissi Region V Office of Inspection and Enforcement Walnut Creek Plaza, Suite 202 CAM4N 1990 North California Boulevard Walnut Creek, California 94596 Docket 50 Attention: R. H. Engelken, Director
Dear Sir:
This letter describes a reportable occurrence concerning the San Onofre Nuclear Generating Station Unit 1 Reactor Coolant System. Submittal is in accordance with the reporting requirements stipulated in section 6.9.2.b(2) of the Technical Specifications.
On July 30, 1976 at approximately 6:15 a.m., the steam generator radia tion monitor indicated high activity on the blowdown from steam generator "C".
A primary to 'secondary leak rate between one-half and one gallon per minute was confirmed. The unit was removed from service for further evaluation of the problem.
Subsequent investigation using a hydrostatic test on the steam generator secondary side revealed a leak in one tube in "C" steam generator. The tube was explosively plugged and the hydrostatic test was repeated. No additional leaks were discovered and the unit was successfully returned to service.
Inspection efforts aimed at assuring the integrity of steam generator tubes continue. It is anticipated that during the forthcoming refueling outage an eddy current inspection program complying with the requirements of Proposed Change No. 27 to the Technical Specifications will be completed.
Proposed Change No. 27, submitted in December 1974, implements the provisions of Regulatory Guide 1.83.
Sincerely, Attachment cc:
Director, Office of Inspection and Enforcement Director, Office of Management Information and Program Control s a sb e
w s
el pd a
- LICENSEE EVENT REPORT CONTROL BLOCK:
(PLEASE PRINT ALL REQUIRED INFORMATION]
1 6
LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE 0 c IA IS 101 SIl 10 101-10101-01 01 01-10 101j 14 111111.111 01 3 7
89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE CONT I
LI L 1 10 5 101-1012 1 0 6 10 17 13 10 17 16 1 01 81 01 31 71 6 1 7
8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION During normal full power operation an indication of a primary to 702 Lsecondary leak in steam generator "C" was observed at approximately 6:15a.m. on 7
8 9 80 03 [ July 30, 1976. After removing the unit from service a subsequent investigation 7 8 9 80 04 I using a hydro on the steam generator secondary side revealed a leak in the tube 1
7 8 9 80 05 Ilocated at Column 60 Row 45. The leaking tube was explosively plugged and a hydro was 7 8 9 80 6 I repeated. No additional leaks were discovered and the plant was returned to service.
7 8 9 PRIME 80 SYSTEM CAUSE COMPONENT COMPONENT OD CDDE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION I
I.'J
^
L I IIE IX IC_ H INI IW 11 12 0 1 LNJ 7
8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION 08 il Wall thinning of steam generator tubes.
7 8 9 80 7 8 9 80 FACILITY METHOD OF STATUS
% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION E1 Lj 11 nI0 NA LaI I Hi Radiation Levels on Monitor 7
8 9
10 12 13 44 45 46 80 FORM OF ACTIVITY COF4TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE S MIJ MJI See lines 19 & 20 belo
[Gas vent to atmosphere &.liquid to ocean, 7
8 9
10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION
(
l 1o 01 E]
[NA 7
8 9 11 12 13 80 PERSONNEL INJURIES NUMBER DESCRIPTION 1
01 of I NA 7 8 9 11 12 80 OFFSITE CONSEQUENCES 1D 5 NA 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION 16 [LI I One leaking steam generator tube required plugging.
7 8 9 10 80 PUBLICITY Event released to standard publicity list.
7 89 80 ADDITIONAL FACTORS Activity released prior to closing steam generator blowdown line and terminating air 7
89 80 S9 [ejector operation: 2.7xl6 6Ci Noble Gases from Air Ejector & 0.038Ci through SG blowdown 7
8 9 -
80 NAME:
H. L. Ottoson PHONE: 714-492-7700 GPO 881.687