ML13308B460
| ML13308B460 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/20/1977 |
| From: | Ottoson H SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| RO-77-06, RO-77-6, NUDOCS 8103050986 | |
| Download: ML13308B460 (2) | |
Text
,,'.'NS II*~ ER,77-06.
ICENSEE EVENT EPORT!
p CONTRLELC Pb~
PRIIII T ALL REIRUUIED IUFORMATKIU3, 6
LICENSEE NAME LICENSE NUMBER TYESE 01 I A1o.1SI 10 01 101 010 10101-1 0101 1411 111.
78 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE OCONT[~p j
[j01 j
I 10 1510 1-10 1 21016 1 101 4121 61 717 1 1015 1 2101 '717 1.
7 8
57
- 58.
59 60 61 68 69 74 75 80 EVENT DESCRIPTION 0 During normal operation April 26, 1977, the North Bor c Acid Transfer 7 8 9 80, 03 Pump (G-9A) failed to start., Redundant systems were itvailable. The.-heatj 7 89 so 04 Itracing components were checked and found to be operating properly. How-I 7 89 8
L5 ever, disassembly of the pump revealed an accumulation'of boric acid I
LICENS
~I crystals. A spare purn was installed and-placed in service Apil27,197 7:
8 9Thle event is non-repetItve, (1,4)..80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION 0O7 LIPLC L~i I P U IM I P XIXI LNJ IL 1310 1 01 IN.L 718 9 10 11 12 17 43 o44 47 48 CAUSEE DESCRIPTION 08 Achempump Model GD-5K-152-1S Boric Acid Transfer Pump seized apparentl' 7 89 80 09 [due to an accumulation of boric acid crystals. He;,t tracing circuits I
19-06 10 were verified. as operatiniz properly and additional lagging installed. I 8 FACILITY ALLMETHOD OF I
R STATUS
% POWER
'OTHER STATUS DISCOVERY DIS COVERY DESCRIPTION 30 31 32 0W i I J *L
'N~A r NA 10 5 1 07 7
7 8 j 57 5
59
.6N1686A4, 58 7
8 9
- 10.
12 13
.444 80 FORM OF 80 ACTIVITY CO mpTENT er cfo V
,RELEASED OF RELEASE
- i.
AMOUNT OF ACTIVITY.,
ocATION OF RELEASE 12
~j'
[JNA
'NA,2 78 910 11 44 45 18 7
.8 9
I80 PERSONNEL 'EXPOSURES NUMBER' TYPE DESCRIPTION 1 3 1010 101
.J NA
~7 8 9
.11 12
.13'
'~~~
'V
801 PERSONNEL INJURIES
,'~
NUIMBER
'DESCRIPTION 7 89 OFFSITE CONSEQUENCES 7
8,9Th 8Vn S
o-epttve(72).s LOSS'OR DAMAGE T6 FCIDLITY CD SNV YPE DESCRIPTION PUBLICITY
,I' ADDITIONAL FACTORS i'
A NA M-T
- 7.
8 9B 80 STNAMET H
OTHER SUPERINTENDE PHONE VERYDESCRIPTO 7
8 9
10 12O88?
1 67 FORM O
2ay2%' 1977 Reuaory Docket x~7?
~2 U. S. Nuclear-Regulatory.Comnisssion Region V Office of Inspection and Enforcement Suite 202 alnut Creek Plaza 1990 North California Boulevard Walnut-Creek, California 94596 Docket No. 50-206.
an Onofre Unit 1 Attention:
R. AH. Engken, Director
Dear Sir:
This letter describes a reportable occurance rivolving.the Chemical and Volume Control System. Submittal is-in accordance with the reporting requirement stipulated in Section 6.9.2.b(2) of the Technical Secifications.
On April 26, 1977, the north boric acid transfer pump failed to start Corrective action was initiated; a spare pump was installed and placed in service April,27, 1977. During the period that'the north botic acid.transfer pump was out of service, both the boric acid injection purip and the south boric acid transfer pmp were. availabl nd the conditions of Technical Specificaitio
- 3.
B{2) werd, theref6re,. satisfied.
Investigation revealed an.accunulation of boric acid crystals.in the failed pump The pump lagging and heat tracing circuiits wer examined. Operating procedures were reviewed. No specific cause for the failure could be positively determihed. However, to afford greater protection from potential development of isolated cold areasj additional lagigwas added in the vicinity of the pump and-adjacent piping.
If you should require additional information concerning this occurrence, please contact me.
Sincerely, (J. T. Head, jr.)
Attachment Licensce Eent I.eport 77-06 cc Director, Office of Inspection.& Enforcement Director, Office of Management Information & Proqrant Control