ML13316B765

Ro:On 800922,while Decontaminating Steam Generator Channel Heads,Decontamination Sys Was Shut Down Due to Excess Makeup in Sys.Examination of Seal Revealed 10-inch Tear in Rubber Ballon Resulting in Seal Failure.Cause Under Review

ML13316B765
Person / Time
Site:	San Onofre
Issue date:	09/22/1980
From:	Curran J SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
RO-80-290, NUDOCS 8010060266
Download: ML13316B765 (3)

Text

RE9.ATORY INFORMATION DISTRI*ION SYSTEM (RIDS)

ACCESSION NBR:8010060266 DOC.DATE: 80/09/22 NOTARIZED: NO DOCKET #

FACIL:50-206 San Onofre Nuclear Station, Unit 1, Southern Californ 05000206 AUTH.NAME AUTHOR AFFILIATION CURRANJ.M.

Southern California Edison Co.

RECIP.NAME RECIPIENT AFFILIATION ENGELKENR.H.

Region 5, San Francisco, Office of-the Directo~r

SUBJECT:

RO:on 800922,while decontaminating steam generator channel heads'decontamination sys was shut down due to excess makeup in sys.Examination of seal revealed 10-inch tear in rubber ballon resulting in seal failure.Cause under review.,

DISTRIBUTION CODE: A002S COPIES RECELVED:LTR.

ENCL:

SIZE:4 TITLE: Incident Reports NOTES:1 copy:SEP Sect.,Ldr..

05000206 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME.

L-TTR ENCL ACTION:

CRUTCHFIELD 04 3

INTERNAL: A/D COMP&STRU06

1.

A/D ENV TECH 07 1

A/D MATL & QU08 1

A/D OP REACTOO9 I

A/D PLANT SYS1O 1

A/D RAD PROT 11

1.

A/D SFTY ASSE12 1

A/D TECHNOLOG13 1

ACC EVAL BR 14 1

AEOD 2

ASLBP/J.HARD 1

AUX SYS BR 15 1

CHEM ENG BR 16 1

CONT SYS BR 17 1

CORE PERF BR 18 1

D/DIRHUM FAC19 1

DIRENGINEERI20 1

DIRHUM FACIS21 1

DIRSYS INTEG22 1

EFF TR SYS BR23 1

EQUIP QUAL BR25 1

GEOSCIENCES 26 1

I&C SYS BR.

29 1

I&Ei 05 2

JORDANE!./IE 1

LIC GUID BR 30 1

1 LIC QUAL BR

31.

1 MATL ENG BR, 32 1

1 MECH ENG BR 33 1

MPA 3

NRC PDR 02 1

OP EX EVAL BR34 3

3 OR ASSESS BR 35 1

POWER SYS BR 36 1

1 ESS BR39 1

REACT'SYS BR,40 1

1 01 1

REL & RISK A 41 1

1.

SF PROG EVA42 1

STRUCT ENG BR44 1

1 SYS INTERAC 845 1

EXTERNAL: ACRS 46 16 1

LPDR 03 1

1 NSIC 05 1

TERA:DOUG MAY 1

1 00 TOTAL NUMBER OF COPIES REQUIRED: LTTR 0'f ENCL 6*

Southtern Ca(/forn/ao d&a o in p,

~

d 1 jIri September.49 1 06 tJS.lUCleakr Regul atorY COyMMIt i i h Off ice of Inspection anad Enforcement,.r fR9ion V 1990 Horth California boulevard Sulte 2021 Walnut Creek Plai6 Walnut Creek, California 94596 Attention:. INrj Rt H. Ergiekeh, Director DOCKET 7~.$-0 SAf ONOWR 011J I D)ear Sir.'

This letter describes A r-eporta bl occrence tnvovn n

advertent dilution of the, reactor-coolant stei'*-. SUbihit1 ii in iacerda1nce with the reporting requlrepuents r,'tjoulbtod 1:tnetc i

of Appendix A. to the Provisiona IOpera ting L Icense6 I(WR On September 22 1980 Work was tunderokY to deotamnt h t generator channel heods,!" order to toiniMize men-rem during twe itiidi gnerator sleeving rpi rga.Te decontAmination orocessts higih pressure grit spray-t* reaove the om~dt lAer from thb iteam*

qdferator channel head.

In order to prevent the wtr-oed sprAy from enterinq tfi r-e*ctbj coolant system, Inflatable plugs vier*4 installed, in order t6, on'itbr for leakage patth lusth owtng Itm iri tontiousllly m66itred:.

10 Inflatable teal pressure.

D. econtamnation system wAter inventory.

3i Reactor vessel l1evel

4. Volume control taok ievel

~. boront concentration (samptes A i4 ta ke n 6nce hbur ciArin.g dotont~inAmtion operation)

At 2145 the decontaminatoll

$yt~ Wa S S'6A dowi du6 twxo cs

~~

akeup in the decontfamination 'syom A bron ahslys Sat 215 Indicat at dilution of 51 ppm had occurred. Th* loop sea) Was 6xamined and f ouWnd to have failed. A seal pressure change wak hot observed be*cause the gauge quick disconnect was not.-properly connected,, isolating both the gauge Mnd

/ (

Sealx air supply.

Examination of the seal found a 10'" tear-in the rubber ballon resulting in sea falue Th 1cAt Ias - f th -e n syt fgailure is still Under invyesti ati.4 8*00)60 a 66

U., S.luclear Iegulatory cowitS~O6 Page #2 Ifie dilution in boron concenitratio6 ot so ppm reprse 6 reai AY Addition in excess of the $04 prompt reportino req-uirments' of Section 69,2.4 of the Technical Spec ftf kationst The inadverteit dili Oclird during a time when contairoent intovrity iW6a not estiblishedaseqrd by Section 3.6.B83 of the Technica Specifications.l At Inoi timek Mi boron concentration decrease belo 240oppi Whh rpresents qa 6 090.

66eC106 taminatlon of the $team generators has been ditconitifiUed'Iil repafri ha~ve been completed, and correctiv, action tob prevenit ii treoccarrahC6 66"w pleted.

A complet reporL 06 hit, te r 9'geher Wit rpthiwt a Oticee toent Retport wi I be forvorded wIthin 14 day$';

Plant Manager J1TR/ap