ML20236E417
| ML20236E417 | |
| Person / Time | |
|---|---|
| Issue date: | 05/02/1986 |
| From: | Shao L NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| Shared Package | |
| ML20236E258 | List: |
| References | |
| FOIA-87-666 NUDOCS 8710290213 | |
| Download: ML20236E417 (2) | |
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hlAY gn l
1 M. O. Medford Manager, Nuclear Licensing Southern California Edison Company 2244 Walnut Grove Avenue l
Rosemead, California 91770 l
Dear Mr. Medford,
Thank you very much for your letter of April 17, 1986 and the National Board Report on Steam Pipe Rupture at the Mohave Generating Station.
We will appreciate receiving a copy of your company's report upon completion.
.. C. Shao, Deputy Director Division of Engineering Technology Office of Nuclear Regulatory Research DISTRIBUTION:
DET RD DET SUBJ LCShao' RVollmer ATaboad CATHY 2 Shao(5/1/86)
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8710290213 871028 PDR FOIA SEPEB7--666 PDR l
acen 1983 and 14, appear to be caused includes enforcement spend;ng, whah is tions dropped 36%, nitrogen dbxide proach de s a se eral facton. mclinhng the expan-no, longer bmken down by F P t into spe-lesels fell 10% and particulate levels fell called tranil ion of emnomic aonus seen m 1984, ohc progra,ms.
20%. Each of the three rose 2% from ment, "empi -
ays J. Craig Potter, EPA s asmtant ad.
Large gams,were made m, controUing 1983 to 1984, however.
mand side o nmistrator for air and radiation.,
large mdustrial sources during the Lead levels fell 70% over the 10-year This contrasi -
Figures supplied by EPA show its air 1970s. "We are now entering a new era penod and the decline continued in dewtopiact to program's abatement and control bud-where we must examine large numbers 1984 with a 7% drop, partly caused by i
- et was $150.6 million,n fiscal year of small sources," Potter says.
the phasing out of leaded gasoline and roadbuildinc i
1980. In fiscal 1984. EPA spent $142.3 Accordmg to the report, over the an merease in limitations on smelter usually cani i
Starting s nillion on air programs Neither figure years 1974 M sulfur dioxide concentra-emissions.
m traffic corr
' T
!,'rden Utilities replace welded pipe wort, such sections, a timing and
\\t least three utilities are replacing period of years and eventually com.
.selded steel pipe in the steam reheat bined to form microcracks, san Berker, astems of several old powe plants in l'tilities hase expressed great interest Rapidh l
.he wake of two pipe failires at coal-in the inspection program because 60 t plans b l Sted plants in Cahfornia and Stichigan. 70% of powerplants m the U.S. are fit.
About 30,000 ft of welded pipe at an-ted with welded pipe, says Becker. Al-other 50 to 60 plants has been cleared though seamless pipe is, generally Gminnett ( l of suspicion under an inspection pro-preferred, seam-welded pipe is cheaper referendun gram th:.t was sparked by the accidents. and more readily available, he sap. Dur-that would "We're trying to ensure that the de-ing the 1960s, when many of today's ing funds fects that may have caused those acci-powerplanu were built, largediameter provemen' dents are not present in any opentmg seamless pipe was not easdy procured.
inmement i
. plants," says Larry Becker, pr ect man-
"I think you're on the edge of when bmous roa.
a er for special pmjects at
.A. Jones seamless pipe of that size was available,"
Gwinnet lied Research Co Char tte, N.C.
says Romas L Reed, project manager
'The U.S. C i
goo,howir
're trying to maintain a database on for scE. *l think that 30-m.-d,ia pipe was est what plants have been inspected, the not available as a routine thing."
re nature of the pipe and any defects."
He potential problems of welded A Gwin
, J.A. Jones is conducting the inspec-pipe have already, caused Arizona Public steam pipe at Monroe coal plant tust.
Commerce tion program under contract to the coal Semce Co. to switch to seamless pipe at mdlion in tion, it r combustion systems disision of the Elec-its Four Corners bwerplant m New Economics and the uncertainty ofin-that wou c' tric Power Research Institute, Palo Alto, hiexico (ENR 9/5/
p.18). Potomac Calif. EPRI established the program after Electric Power Co., Washington, D.C.,
spections swayed the utility to replace politan Atl a welded steam line burst at the seam, and Tampa Electric Co., are now fol. the pipe, says Christoffersen. Replacing and privat killing six workers and injuring i0 oth. lowing the Phoenix based utility's lead.
1.200 ft of welded pipe with seamless rt sava ers at So sthern California Edtson Co.'s surpries. Potomac Electric was in for pipe made of a stronger alloy will co54
[ ears'a 1,5604tw Stohase coal-fired powerplant a further surprise when it removed insu-about $2.5 million, he says. An inspec-pancv-vehi last year (ENR 6/20/85 p. 37). A similar lation f om its steam reheat pipe, says tion alone would cost about $1 minion mg 'freigh accident injured 17 workers earlier this materials engineer Stephen Chnstoffer-and coula generate confusion because senice cou scar at the 750-51w unit one of Detroit sen. The utility thought its Chalk Point researchers do not know what size crack Gwinner Ldison Co.'s 3,000.hlw hionme station plant was alreadv fitted with seamless is deemed critical, says Christoffersen.s swtTA. Bt (ENR 3/27 p.15).
pipe, its investigation, however, showed By foAn J. Kosowan in New. Fori witA that 58/.
Creep failure? Investigations into that welded pipe had been installed.
James Schware in Detroit sales tax 5 within th(
those accidents are continumg.Re two 20*n'n'0'"J":""A"G Ur$ Seoul job a finst for World Bank C"l12 Edison has said ! hat a dirt like substance the bond i found in the weld may hase contributed tion to si:
to the explosion. Slechanical engineers Transportation planners from the U.S.
In association with the Wodd Bank nett Coun-familiar with steam reheat systems, how-will be meeting with their Korean coun-and two U.S. consulting firms, th,e newly 1971 refer ever, think that high steam temperatures terpans later this month to try to cope fonned $linistry of Transportauon will The co may degrade the mtegrity of the welded with an increasingly unwieldy traffic s t-develop a detailed traffic management road prog >
pipe over a period of cars.
uation in South Korea's capnal, Scotd.
plan for Seoul. The $219-million pmj-or recons 3
"He hypothesh is that there was ne city tradit onally has relied u ett is one of the first examples of an ancries, a
. creep failure," says Eccher.
nearly 300 private bus systems and, approach developed,by the World Bank 160 miles its rail trannt system for that emphasizes the improvement of ex-win also It l
Creep is the predominant rextion of more recently, keeping penonal use of isting roadways and traffic contro In Cobl metals in stress when temperatures are public transit, high. Both the %Iohave and %Ionroe autos to a minimum by sulf taxes. But a er than the construction of expensive ta. a prel plants supplied steam at 1.000 F to the decision in the early 1980s to allow in-new road systems (ENR 3/13 p.18).
the estahl piping systems that failed. SCE's Stohave creased domestic purchases of can to "We're trying to avoid the fos Ange-start expri lar.: used 30 in. dia pipe while the bolster Korea's fledgling auto export in-liiation of Seoul" says %Iike Powds.
TA stauor
. lonroe plani um! 32.in..dia pipe. He dmiry has pmJuted a 207 3carly in-project manner for Clucago-based Bar-county bu hsputhes follows that nut row opic trease in trathc swampmg the esisting ton Anhman Assmiates Inc. one of the has a' mm !
u,ols m the wel lot petx foiineil oser a road netwoik, ion uhants on ihe pt ojet t.
Ihe
.ip.
.Jso is no,
,3 m o.,
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