ML20040C528

Draft Trip Rept of 810617 Visit to Facility Re Chlorination Problem.List of Attendees Encl

ML20040C528
Person / Time
Site:	Brunswick
Issue date:	06/17/1981
From:	NRC
To:	NRC
Shared Package
ML19248B746	List: ML19284A996 ML19284B712 ML19295B679 ML20040C523 ML20040C524 ML20040C525 ML20040C528
References
FOIA-81-362 NUDOCS 8201280113
Download: ML20040C528 (24)

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Chronolocy of Chlorinator Outace

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-February 22,1980 - Train #4 shutdown due to mechanical and electrical -

problems.

-March 15,1980, to September 21, 1980 - Unit Nos. I and 2 outages.

-September 1980 - Restart of Chlorinator System failed due to electrical problems with heaters and controls.

-October 1980 - Restart of Chlorinator System revealed holes in the evaporators.

Evaporators were replaced.

-October 31, 1980 - The Chlorinator System was run for three days.

The system was shut down because of fish kill.

-November,1980 - Attempts were made to operate the system in a manner that would not kill fish.

-December 1980 - Contacts were made with involved groups to resolve the problem of chlorine in the screen wash.

-January 1981 - Trouble ticket submitted to have dam installed.

-March 1981 - A second trouble ticket was submitted.

-April 1981 - The dam was installed in lA service water bay.

-May 1981 - System line up was completed.

Held up start up due to oysters in heat exchangers.

-May 10,1981 - Restarted chlorination.

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From Ta cf Crowth Growth Cicined Couments 0

2-SW-103-30-157 90 Elbow 50' 2-SW-V105 &

Hodtrete Side of$tpa

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I layer of El Rx b1dg V103 Oystero 647 Scrcping growth on fly 11tus 35%

bottom of pipe bottom of pipe 50% coverage of j

fly 11tus 6%

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Barnacles 12%

& top some oyster bottom nhell halfs on niden 2-SW-103-24-157 2-SW-V105 2-Su-V102 light to Oysters &

No Very few oysters i none harnacien or other growth l

found.

This is l

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2-SW-106-20-157 2-SW-V106 2-SW-V193 light to Oysters &

Ho Pipe elevnt ion q

none harnnelen for thin section obtained from n comparison to linit #1 l

2-SW-107-14-157 2B RBCCW Ilx 2-SW-V108 light to hydrozonn &

No Scattered harn-none barnacien nele growth pnty,

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2-SW-234-6-157 2-SW-V275 DGI4 Ilx None None No No attached l

mar inc growt li.

l All shelin were older & appearce!

I to have been b' 7 l * ' ' ' /

unshed in.

2-Su-100-30-157 Intake 2-SW-V3 lienvy 1" Same as Yen Crowth tnpercil gottom tapering Nuclear llender Hydro 1nze off pnoportion.11 to 1/2" top

& Scraping to the distance from the intake 2-SH-100-24-157 Conventionni 25 to 30' Hoderate

Oyntern, Yes cowj"hunnmost Ilender from hender barnn el en,

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From To Cr:wth Growth Cicanni corrmen t s 0

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2-SW-103-30-157 Intck2 90 Elbow 50' Ilesvy 1" Bottom of pipe Yen Growth wan endnt El Rx Bldg Bottom Tappering Oynters 74%

Scraping nhundant near to 1/2" on top Mytilus 17%

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2-SW-29-18-157 Nuclear IIender Just pnnt Modernte-1tght At inlet Ten Crowth was most (10') V255 1/2" n11 the vny Oyntern '30.6%

llydroinze abundant near around ID of the polychenten 8.2%

intet tappered off to 1/ft2 at pipe valve V255 t oward Dienels (1/2 nhell/ft2) 2-SW-1-20-157 2A CSW Dincharge 2-SW-V14 I,1ght-moderate on valve V14 Yen 2-SW-2-20-157 2B CSW Discharge 2-SW-V16 6-8 oyntern per 11 ovaters hydroinze No growth wan found between the 2-SW-3-20-157 2C CSW Dlacharge foot squared 3 tube worms barnac,les pump dlncharge

& the check hydrozonn valven. All growth was found het ween the check valven 6 the nuclent &

conventlonni headers 2-SS-4-20-157 2ANSW Discharge 2-SW-V19 light to none small oystern Mo Arean around barnneler, tube valves were l

2-SW-4-20-157 2BNSW Discharge 2-SW-V20 cleaned, all worms other arens l

did not need c1 caning Area het ce nucl ear l<iendrer &

same n yen 2-SW-117-6-157 Hucicar hender Valve llenvy to light 2-SW-103-Scrnping 2-SW-Vil7 30-157 valve V116 van l

ncrnpped, the n r c:

l hetween V117 6 Vil' did not need clenning l

The following is a breakdown of' the work performed on both Unit 1 and Unit 2 KHR heat exchangers:

2A RHR Heat Exchanger Spring 1980

- Heat exchanger inspected and inlet and outlet elbows replaced (PM 79-232T).

Baffle plate inspected and degradation noted.

13 May 81

- Heat exchanger drained.

Baffle plate inspected with no signs of deformation.

Exchanger cleaned of shells and put back into service 14 May 81.

3 Jun 81

- High AP noted across baffle plate.

Exchanger cleaned of shells, no signs of deformation.

Returned to service 4 Jun 81.

2B RHR Heat Exchanger Spring 1980

- Heat exchanger inspected and a 9 inch deflection discovered in baffle plate.

Vertical plate attachment welds cracked

% 33 inches.

Baffle plate and elbows replaced per PM 79-232S and returned to service.

6 May 81

- Exchanger drained and inspected. A 3 inen deflection of plate noted.

Fillet velds along side walls showed one 2 inch crack.

Baffle plate removed and heat exchanger bolted up and put back into service on 91hy 81.

Unit used as flow path without plate with heavy chlorination of service water system.

16 May 81

- Exchanger drained and lower channel head once again removed so that baffle plate replacement work could begin.

Work completed on 24 May 81 and returned to service.

lA RHR Heat Exchanger 25 Apr 81

- Lack of heat transfer noted by Operations.

Heat exchanger drained to flow and channel head removed.

A 6 to 9 inch deflection noted and plate jacked into position with porta-powers. Bracing stays welded to back of plate for temporary support.

Heat exchanger head reinstalled and put back into service 27 Apr 81.

2 Jun 81

- Exchanger drained and lower channel head removed.

Permanent repair replaced baffle plate and inlet and outlet elbows per PM 79-231T. Work completed on 13 Jun 81.

Awaiting reinstallation of inlet isolation valve-(removed for vessel hydro) before returning to service.

1B RHR Heat Exchanger 12 Apr 81

- Heat exchanger drained and inspected.

A deflection of 8 to 9 inches noted on baffle plate.

Plate replaced along with inlet and outlet elbows via PM 79-231G. Work compelted on 31 May 81 and returned,to service.

3 Jun 81

- High AP noted across baffle plate.

Plans are to drain and remove channel head in order to clean shells - tentatively scheduled for 18 June 81.

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Short Term RHR Heat Exchangers Divider plate AP monitoring Verification of design aP Trend analysis of AP Heat transfer evaldation Other Safety-Related Heat Exchancers Internal inspections II.

Long Term RHR Heat Exchangers Periodic test for checking aP Other Safety Related Heat Exchangers Periodic tests requiring internal inspection I

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Southern California Edison Company 1.h. ~j 2

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U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement

- N,,_l,co '-

Region V

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1990 North California Boulevard

'Q Suite 202, Walnut Creek Pim:a

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DOCKET No. 50-206

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SAN ON0F!E - UNIT 1

Reference:

Letter cated June 9,1981 from SCE (J.M. Curran) to NRC (R. H. Engelken)

The referenced letter provided prompt written notification to your office of growth of some form of saltwater arthrcpoo on the saltwater discharge pipe of the component cooling water heet exchanger E-20A sucn that the cross-sectional diameter was effectively reduced.

This causec low coclant flow and malfunction of the butterfly valve.

Further, tne growth of the arthropod had partially blocked the heat exchanger tuoing.

Succittal is in accordance witn the reporting requirements stipulated in Section 6.9.2 of Appendix A to our Provisional Operating License DPR-13.

In acdition, a completed copy of Licensee Event Report No.81-009 is enclosed.

The saltwater arthropod was icentified as Pollicioes (Mitella) polymerus commonly known as tne gooseneck barnacle.

it is a cccuaor, artnropcc wnicn nas a high temperature tolerance, lives in the intertidal zone, likes turbulent water and is limited to caves and rocks wl:h a water-air flow interface and dark environment.

MAA

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07090270 e1o7og PDR ADOCK 05000206

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43bt su

U. S. Nuclear Regulatory Conmission

,/I Page # 2 An inspection revealed that the gooseneck barnacles were present from the heat exchanger discharge tube sheet outward toward tne sea water discharge piping.

The heat exchanger inlet tube sheet was found to be free of the barnacles.

The partially plugged heat exchanger tubes were cleaned by snooting abrasive balls through the tubes using hign-pressure air.

The heat exchanger tube sheet area and discharge ~ piping were manually cleaned beyond the butterfly valve.

This incident occurred because of the current protracted shutdown of San Onofre Unit I which has lasted over 14 months.

This extended snutdcwn has meant that the saltwater cooling system has not teen. neat treated for over a The plant is currently making preparation fnr return to power, at whicn year.

point heat treatment can be renewea to control the barnacle growth in tne manner which has been typical of San Onofre operations in the past.-

In order to kill 100 percent of the organisms, any one of the following temperature-time combinations would be necessary:

97'F for 3.6 ' hours,101'F for 1.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, or 105'F for 0.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

Pollicioes is expected to be less tolerant than the Bay Mussel (Mitilus), for wnich the heat treatment procedure of SONGS 1 was designed to control.

Tnerefore, conducting normal heat treatment at desi'gnated intervals will control Pollicices.

This is evidenced 4

by the fact that the barnacle (Pollicioes) has not occurred in the past when SONGS 1 was in normal operation.

/

i f you have any questions or desire additional information concerning this matter, please contact me..

Sincerel,

Gh i

Attachments:

Licensee Event Report 81-009 j

cc:

L. F. Miller (NRC Resident inspector)

Director, Office of Management Information & Program Control Director, Nuclear Safety Analysis Center i

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n atacar cATe sa EVENT DESCRIPT!cN AND PROSABLE CONSECUENCES h 9 V2 ITTT11 LOW COOLANT FLOW RATE AND BUTTERFLY VALVE MALFU s

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THE GROWTH HAD REDUCE 0 THE CROSS-SECTIONAL io;33 l PIPING AND IMPEDED YALVE MOVEMENT.

THE INLET SIDE OF THE HEAT EXCHANGER W 1 gij.J io y j l TO -BE CLEAR.

THE HEAT EXCHANGER TUBES WERE PARTIALLY BLOCKED.

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BECAUSE OF THE lo,;; l PROTRACTED PLANT' COLD SHUTD0'/N, THIS EVENT PRODUCED N0 ADVERSE

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THE HEAT EXCHANGER AREA AND CCNNECTING PIPIN

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COMPLETE RE!10 VAL OF 3ARNACLES WILL BE l BY HEAT TREATMENT UPON RETURN TO POWER.

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50-302/til-003/0 A -0 facility:

Crystal River Unit 3 Ret. ort Date:

Ma rc h 4. I c>31 Occurrer<e Date:

february 4.19'11 I&r tificatirm of Occurrence:

Aulliary Butiding irntilation f ahau.t Systert filter '.y'.tec Ms tb l lodide rermal efficicncy '95* contrary to Technical i

SpccifIpatien 3.7.8.1.

Conditions l'rior to 0:currence:

Pode 1 power operation (93*.).

Deuription of 0:currer.ce:

h,?.ile reviewing charccal test results, it was dncovered that filter systm k!TL-?D rethyl lodide rwnral ef fir ice < v was 92.14I. Kaintreance had t+ce f>reviously initiated anl the flitir cells were replaced with other tells crentaining nns igrevated charcoa?. A functioral te".t was gerfcM satts-factorily and operability was re'.tcred at 15tX) on Icbruary 5. l' FMiq*ation of Apparent Cane:

A muster of cor. trita,tirr; facters Ico to the deterioration of the charcoal filters,. Pollutants in the atmosphere *.uch as flue gnes. lodine S4 sorption. and norval air flow cause a loss of charcoal lepregnant ' efficiency.

Anslysis of Occurrence:

There was no effect upcn the health or safety of the ocorral put tw to tbc large rest,er of factors involved in the deterioratioe of tFe charco.il and trevase desorption of various conta-inants r.ny cau'.e erratic filter efficiency, there 19, no quantitative tv t%f for trenfino (f ficirecy to deterstine when a tank will dre

' telow the required ef f f ciency.

Corrective Action:

• nttorinq nf the charcoal filtt r t ant', will ccwly with Tech-e te.il %pecif trat iren *.uryt 1114nt e reNuirwent s.

k:> further tor-rective action detned r,ccenary at this tire.

Failure Data:

Ibis was the '.ectinal en t urre nt e of inadequ ite fil te r o f fit te nc y and this is the t s If th cvent re;'crted under this Spec ification.

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