ML20086E445
| ML20086E445 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 03/08/1973 |
| From: | Walker R PUBLIC SERVICE CO. OF COLORADO |
| To: | Kruesi F US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086E328 | List: |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8312070308 | |
| Download: ML20086E445 (3) | |
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$0 'O h 1 Mr. F. E. Kruesi Directorate of Regulatory Operations U. S. Atomic Energy Commission Washington D.C.
20545 Subj ect: Deficiency Report 10 CFR 50 PCRV Cooling Water System
Dear Mr. Kruesi:
Pursuant to the reporting requirements of 10 CFR 50, Part 50.55, we are submitting herewith, as an interim report, twenty ccpies of the subject report concerning the failure of the carbon steel tubes in the heat exchangers of the PCRV cooling water system.
We trust the attached will provide you with sufficient infor-mation and will fulfill the requirements of an interim report under 10 CFR 50 regulations.
Very truly yours, R.3.W cd #
R. F. Walker, Vice President.
Engineering Plcnning.
Electric Department RFW/FES:als cc:
Mr. John Flora Directorate Region IV ef. G.
v-8312070308 730516 PDR ADOCK 05000267 -
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..M DEFICIENCY REPORT 1
-10 CFRISO PART 50.55 m
Facility: Fort St. Vrain Nuclear Generating Station
Subject:
- cPCRV Cooling Water System Date:
cFebruary 1973 Upon returning' Loop'1 of the PCRV Cooling Water System to service following.
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maintenance', it was apparent-that ran; excessive: makeup,wasyrequired to main '
tain ' normal water 'le,ve171n$ thk} surge] tank.. Subsequente. investigation re ;
vealed a leak in heat exchanger E-4601.' The'he~att exchanger,: process and ;
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cooling water sides supplied by the Service Water System, were. isolated land -
the exchanger-remo[ed,from.se,r d,c,e; N j m..wr(,'3 M., =
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- Removal;of the channel headeand. pressure; testing-indicatedifive.(5) leaking; tubes. Because it sas< thought >the tubes mighit-haie been damaged due -to, I
over-pressure,. the tube bundle _waa runcovere~d for inspection.
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Removal from' the'shell' of 'the bundle revealed a maj orf accumulation - of par '
ticulate matter throughout the: entire thbe' bundle and evidencefof 'evere s
. corrosion.
An _ attempt was' made to flush the accumulated -material-f rom E-4603 in Loopill 9
of the.PCRV Cooling Water System but to no: avail. 1Visualjinspectica.of the-1,, "
she111 side _ of this. heat : exchanger indicated (conditions veryfnearly. like r those f found;in E-4601'.;
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The-heat: exchanger' utilizes; carbon steel / tubes withi.thS process?fluidion!~
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.the tube side and' Service Cooling Water on the shelli ide?
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. Inspection ofl the. sh' ell; side of heati.exclianger E-470211n the"Purificationk Y
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Cooling. Water System 1 also ' supplied ' from lthe ServiceLWater[Co'o11ngISystem? 2
' indicated very; minor; corrosion of ? theicarbon: steel 1 tubing. but not nearlyj to r.
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s the extent ~of'that in E-4601" "
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Discuss' ions withJour < water, treat!aent ' Consultant's confirmed-thedow flow? con-l I,
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f dition Tesponsible :for?thei accumulation. of particulatesfand 5 thef particulates: "J^
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e Corrosion",!which'is caused bY'the electr.olytic." action between;the earbon %.
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f steel tube andia bit of tiron oxide saale,debrie lodg'ed 'againstl the tube. A The r fQ
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- We: are inspectingiother carbon-ste'el tube. heat:exchangers? involved!in 3the N% k
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Service'Wate ESystem toidetermine1theJfulllextentlofithe' problem H Welhave ?
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' Deficiency Report-p p
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Page 2 PCRV Cooling Water System
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We are presently. evaluating the water. treatment used.in light of our problem-and the' other heat exchangers supplied' from the Service Water System. ' We are also investigating the~use.of various materials for tubing in the damaged heat exchangers based on both process and cooling water chemistries to
. replace the carbon' steel..
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