ML20070P236
| ML20070P236 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/26/1982 |
| From: | Jun Lee AFFILIATION NOT ASSIGNED |
| To: | Basdekas D NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| Shared Package | |
| ML20069K573 | List: |
| References | |
| NUDOCS 8301260294 | |
| Download: ML20070P236 (2) | |
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Dear Mr. Basdekas:
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The recent discovery of steam generator corrosion at TMI Unit i has y/iy kV raised questions that beg explanation.
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For this Ivason I am prevailing upon your professional evalu'ation and
'y ' a patience to respond to the following:
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1.
The 'Ihiosuphate Theory
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a) Is it exclusionary?
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b) Have all the possible sources of mulphur c'ompounds, f,
detected in tho steam c,enentt.on:, been invent 1 ated Je<
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other than the thicaulphate which was or was not in-
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advertantly introduced into the HPV?
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c) What ain the other possible sources of sulphur?
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l d) What is the amount and source of chlorine that in Li y, i
present in the ste.u generator?
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NOTE:
See Steam Genemtor Status Leport (TMI #1)
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2.
Henry Hukill - GPUNC - May 7,1982 News Pelease.
"We are very
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pleased with the results of the test program which clearly i
demonstrate that the corrosion problem has not affected the
.i reactor vessel's internals. "
a) How can the thiosu] 9 hate have corroded the s team.
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generators with "no effect" on the reactor pressure
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internals?
b) Has any trace of sulphur been detected in the reactor internals?
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3 The Steam Generator Monthly Statua Reports suggest the alloys
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attack.
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9 a) What is the pnnent integrity of these alloys?
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b) Would this sensitization of these alloys thnaten the
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'.a safe operation of Unit #1?
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c) What other sources would cause the corrosion that may not have been discovered or cormeted?
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Testimony given by a representative of Foster Wheeler on June 29,
'N 1982 at 7735 Georgetown Fd. - Iioom 6110.
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a) Wheeler conceded that the,present testing only addresses q.
ir a difference in temIcmture.between the tubing and the tubeshoot of 50F.
It was also conceded that a difference
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in Lemiernture between Lubing and tubecheet of several l
hundred degress could cause leaking.
h y, ~. r b) Could that difference in tempemture between 50F and
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+.:t several hundred degnes create a replay of the Ginna
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event?
P c) The Steam Generator Monthly Status Hoports have not addredoed k
the steam generator transients upon the PTS problem. What is. o C
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your opinion?
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5 Explosive Expansion fispair Procedures on Tubing L'Y J.',I a) What adverse results should be anticipated from the explosive-expansion repair procedure?
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b) How reliable and enduring will this procedure be?
. -j The cleanup of Unit 2 is entering a critical stage.
Therefore, it is my hope thati overy effort will be made to thorour.bly investigate any problems in Unit i so we may avoid any repetition of Unit 2.
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ane Lee D
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