ML13308B459
| ML13308B459 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/29/1977 |
| From: | Head J SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 8103050982 | |
| Download: ML13308B459 (10) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUTGROVE AVENUE J.T.
HEAD, JR.
ROSEMEAD, CALIFORNIA 91770 TELEPHONE VICE PRESIDENT June 29, 1977 2135721472 U. S. Nuclear Regulatory Commission Region V Office of Inspection and Enforcement J977 Walnut Creek Plaza, Suite 202 UJI NUCLEAR 1990 North California Boulevard f
Awl Walnut Creek, California 94595 Attention: R. H. Engelken, Director Docket No. 50-206 San Onofre Unit 1
Dear Sir:
This letter is submitted in accordance with Section 5.6.3 of Appendix B to Provisional Operating License DPR 13 and describes a reportable occurrence defined therein for San Onofre Unit 1.
Specification 3.1.1.a.(5) of Appendix B to the San Onofre Unit 1 Provi sional Operating License establishes, in part, that proper system operation of the two offshore continuous water temperature recording systems be verified once every two weeks. Each of the two temporary continuous temperature recording systems consists of sensing devices that record water temperature near the sea surface, midwater and near the bottom.
During a scheduled operation verification check on June 1, 1977, it was discovered that one temperature sensor had been lost during the previous two weeks resulting in a two-week period of missing data. The sensor was at the Zone 6 system's near surface location.
The lost sensor was replaced immediately upon discovery. The other five sensors were also checked at that time and found to be operating properly.
The offshore water temperature monitoring system has encountered various design and mechanical problems since its conception two years ago and this year has suffered from two other probe disappearances. This latest problem again appears to have stemmed from vandalism. To preclude probe loss due to surf or tidal action, the probe clamp and anchorage system was modified on June 1, 1977.
However, these modifications will not prevent the removal of the probes through vandalism.
Should you require additional information on this matter, please let me know.
Ver truly yprs, Regulatory Docket File cc: Director, Division of Reactor Licensing Director, Office of Inspection & Enforcement (20)
Director, Office of Management Information & Program Control (2)
Southern California Edison Company LIVE BETTER SEP2470 P.. ox85,Los Angeles, Ca//fornia 90053 PeIVA1/
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@0 PB MET ER yrA AIR MAIL Director Division of Reactor Licensing United States Atomic Energy Commission Washington, D. C.
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i 8 Nelar Regulatory Comission Region V Office of Inspection and Enforr Walnut Creek Plaza, Suite 202 1996 N.'ort!V California Edulevard Walnut Creek, Calif6rnia 94595 Attention:
R.- F. ngelken, Director Docket No. '50-206 San Onofre Unit 1
Dear Sir:
This letter is subitted in accordance with Section 5.6.3 of Appendix 3 to Provisional Operating License DPR 13 and describes a reportable occurrence defined thereiri for San Onofre Unit 1'.
Specification 3.1.1.a.(S) of Appehdix.B to the San inofre Unit 1 Piovi sional Operating.License establishes, in part, that proper system operation of the two offshore continuous water temperature -recording systems be verified.
once every two weeks. Each of the two temporary continuous temperature recording systems consists of sensing devices that record water teiperature near-the sea surface, midwater and near the bottom.
lDuring a scheduled operation verification check ori Jun 1, 1977, it was discovered. that one temperature sensor had been lost during the previous to weeks resulting. in a two-week pdriod of missing data. The sensor was at t he Zone 6 system's near surface location.
The lost sensor was replaced immediately upon discovery. The other five sensors Were also checked at that time and found to be. operatin properly.
The offshore water temperature monitoring system has encountered various design and. mchanical problems since its conception two years ago and this year has suffered from two other probe disappearances. This latest problem ain appears to have stemied from vandalism. To preclude probe loss due to surf or:
tidal action, the-pr6be clday and anchorage system was niodified on June I '.1977.
However, the e modifications will not prevent the re.doval of the probes through vanaaliain.-
Should o
equire dditional information on this wattcr, please let am know.
V6ry truly yours cc:
Director, Division of Reactor icensirig Director, Office of
,Ernf4rcenant (20)
Director, Office of Man8iiI) 8tion & Prograf Control (2)
Regkcr V Ofi-ice Oi _T~sp66tion a nAfc
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-- tl't:~ Cree PI~a S'ite 2102 1990 1,ort Califbrhia Bulevwri Walnu.t Creek, Calif rna 94595 T*
letter is I
I-"'it-iii aordante r n vi S on 0
- yo ppened to PrroV isiona-4. Orating, icense.. DPZ 13, a, -ftcribes a reor table.bccu '- n'
- ~ efin~4t rein for San Gnofte ~il
......scificatibn 3.1 1';a. (5) df Appemix B to t 4,
p idned. Gperating Lica se -e-tb-es
-in par't, th&aL yr~r~seuc~rt of th-tw~o of fa-bOre corntinuou lgater teiipratere. reccodi-rq,sjite~
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Once -every two ivoeks.' tach of the -two tsworaY1 -con' inuc'us-t~'eprature recording systems$ consists-of Zen inj dices, that xocord waterz tijpratuire near the sea. surfaoe, zdidwater and-ineardie LLV N
O urin.19 a ' -Chedule or 6t n verfaincekonJn
...~7 ra a~i~in-cmec..m Jui6 1 177it siwas viqcOvered that one teroeratu~ r
-h dbe dtii.te §P-118u tWO.
V~--k resulting in a w-peek. jerWo bf -wissing deta.
he. sno tte one: systerns iear zurfae locatio.
sensorrs, wer also ceckda that* tim und, Z m 1Apt be r in Proel.
Theofshre hter
-e~irtreo~oi~systm has.encountered vrvs
-desi-cm nd
~cai~
prbeis ince its conception.two -years "ago and~ this yOar hasfere. frw t
other,pr 6isagarqinces. Vais lateW~ Xr~blee. - aa fper ro o.ve 'terxa mro 3 v alisr-..Bopreiae Probe los diue -to s-r - opr tidallactionte rbci and corage -s y~jte~ wcs'iffr1i "le Ott:
1, 1977
-IevC r thfese vndfian will not.'grev,,nt the rprxftl ot the probes thr'jg vartidri Omi1i xnta Sfhoul vo recpuire,ac&i~ih n
oiain.
ti~
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24 Director Nuclear Reactor Regulation Ua S Nuclear Regulatory Commission Mail Code: BETC:
042 Washington, D-C. 20545