ML20037B278

Repts Recent Turkey Point Preoperational Testing Incident Re Main Steam Line Safety Valves & Headers.Requests Advice as to Whether Headers Are Installed in Facility Steam Line within Ten Days

ML20037B278
Person / Time
Site:	Dresden, Quad Cities
Issue date:	12/10/1971
From:	Grier B US ATOMIC ENERGY COMMISSION (AEC)
To:	Brian Lee COMMONWEALTH EDISON CO.
Shared Package
ML19340A960	List: ML19340A959 ML19340A961 ML20037B278
References
NUDOCS 8009100886
Download: ML20037B278 (2)

Text

'

I v

Lecccher 10, 1971 Dochet Do 50 -10 Docket !!o. 50-237 Co menwealth Edison Ceepeny Docket No. 50-249 fyron Lec, Jr.

Accistant t.o the President Docket No. 50-254

1. Gi:

Docket No. 50-265 P. O. Box 767 60690 Chicago, Illinois Gentlemans D?cenber 9. 1971.

Thu followin; vas sent to you by telegrae. on Poeor and Light d

Ue recently received infort:ation frem the Flori al testing of the Coe,any of an occurrence during preupurationc ctor that nay Turkey Point 31*.catinghouse precsurized unter reare your facility.

The information is as follown:

d renetor, three During hot functionni teotius of the unfuelelly eject?d frmt two of four relief valves were catastrophica re nounted. The v.uin atenn line headers, to which they we fabricated f ailed headers were 12-ir.ch diaceter. cpool picces Schedule 60 by the Dravo Corporation, l'arietta, Ohio, fron l p1pc

(.562-inch vn11 thickneco) A106, Grade 3 carbon oteeLorain, Ohio, canufactured by U. S. Steel. Lorain Uorks, from cach other, on the two ofdco of the horizontally, 1800The henders uere hydrostatically tested atfunct nnt.1 teeting 4

1356 pcia undtr cold conditions prior to hotCn one s t:nin nteetm line.

cca red $n l

the vicinity of the hent nffected zone oto be Inrgely coniined to the riner to the headcr and appearsOn the other cide of the vain oteam line,

d in a oleilur ennner nnd the 12-inch heador.

the fnilure apparently originate cutantrophic dar: age i

propagated through the pipe header cauc ngThe occondary cyuten van at d 546.6cF at to the header acccably.and 5456F and the prinnry system at 2232

' ]

~

l f

JQ Jmig, D

l

y-v.

(

(

Ce:monvcalth r.dicon Co:pany December 10, 1971' the tico of the header fai3 ure. These systcan had been at their respective prcccurcs and terpcratures for nino days. No trancient conditions vere reported to have exicted in thece nyctens at the tino of failure.

T1m failed header accenblics cach connict of two valvec rounted vertically in a dead-end,12-inch diancter pfpc projecting at a 90' horizontal angle from the main etcan line. The two headers are counted at 1800 to cach other on the opposite sides of the main steam line. The headero were denigned to ecct Soction 1 of tho AS:'I Code by the Lechtel Corporation.

For your reactors which are licensed to cperate, it is rcquestod that you provide this office t71 thin ten days, in writing, as to whether headers as described above are installed in the stcam lincs of your facility.

Should you have any questienc concerning thir matter, we vill discuss them with you.

Sincerely youro, Boyce H. Crier Regional Director bec:

J. G. Keppler, CO l

J. B. Henderson, CO A. Giatbusso, CO L. Kornblith, C0 R. H. Engelken, CO P. A. Morris, DRL CO Files DR Central Files PDR Local FDR NSIC R. L. Shannon, DTIE D**D

• ]D'TY@

o Ju 1.klALa

~

co