ML20079F908
| ML20079F908 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/16/1984 |
| From: | Aamodt N, Jun Lee AAMODTS |
| To: | METROPOLITAN EDISON CO. |
| Shared Package | |
| ML20079F903 | List: |
| References | |
| NUDOCS 8401190339 | |
| Download: ML20079F908 (5) | |
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UNITED STATES & AMERICL bCLEAR RDAILATORY CCMMISSION.
BEFORE THE A'!DMIC SAFETY AND LICENSING BOARD 00CHETED UpWC In the Eatter of
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MEIROPOLITAN EDISCN CCMPANY Docket 50-289
'84 JAN 18 A10 S2 (Stean Generator Repair)
(Three Mile Ia3and Nuclear Generatin6 Staticn, Unit 1) f.Frc cr Cerv 9 ;
- :.,; w e: n LEE E AL. RESPONSES TO LICEiSEE'S FIRST SN & IlhERROGATOPIE 1
The joint intervenors, Lee et al., provide this sin 6 e response to
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Licensee's first set of interro6atories.
To answer separately, as roguested, would only result in duplication.
We affirm that the answers provided herin are to the best of our current knowledge and understandin6 accurate and complete.
1(2)1 - Sulfates and reduced forms such as thiosulfate.
1(2)2-1.
Sulfur removal is not complete.
2.'
Sulfur is present in the steel from which the tubes were made.
1(2)3 - 1(2)2 Self-evident Att.1, " Historical Review of the Principle Research Concerning the Fnenomena of Cracking of Nickel Base Austenitic A13cys", Pg.1158, Indicated paragraphs.
1(2)4-1.
Sulfides I -
2.
As yet undefined forms which ni ht couple synergistic 1y with 6
other elenents br conpounds to function as stress crackin6 a6ents.
1(2)5-1.
Polysulfides were generated to cause the current problen.
2.
Att. 1 - See 1(2)3 l
l 1(2)6-l 1.
There is still reasonable uncertainty that sulfur remaining l
in the system will remain inactive, particularly during transients.
l 2.
In the event, particularly, of system oxygenction, spontaneous intergranular degradation could occur spontaneously f rom the actien of sulfur within the alloy catri):.
i 6-8401190339 840116 PDR ADOCK 05000289 O
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1(2)7 - 1. 'Ch'emical reduction
- 2. Att. 1, See 1(2)3 3. Other mecha.nisr.s of which we are unaware by, virtue of failure of Licensee to look for them.
1(2)8,9 - See 1(2)6.,
1(2)10 Yes 1(2)11 Cerrosion would likely reinitiate:
1.
By the mechanism already evaluated by Licensee if active reduced farms of sulfur are generated 2.
Spontaneously if tube composition varies excessively 3
By intergr==1=* attack by agents which depend on synergistic response provided by heretofore unevaluated trace con +==inants 1(2')12 1(2)11
- 1. Self-evident
- 2. Review of attachment (1) " Historical Baview of the Principle Research Concerning the Phenonena of Cracking of Nickel Ease
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Austenitic Alloys" - entire.
1(2)13 Self-evident 1(2)1h See1(2)'12 1(2)15 No 1(2)16 1(2)17 -
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1(2)18 Possibly 1(2)19 1.
If a suitable synergist is present. activity can be increased l
r.any-f old.
l 2.
If a suitable reducin
- e. gent is present, active ferns can be l
generc.et.
3 If a tube cenpesitien is approprinte, effect cf active fc:.s-1 i
cf sulfur can be ncgnified.
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- (2)20 1(2)19-1.2 Self-cvide,-
1(2)1c y see 1,-..
In, ire ;; c; 1
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1(2)21 Attaahment 1 - 7tn paper is short and c:ncico and tha desired information is dhcussed throughout Paragraph and page references are insppropriate.
1(2)22 In essence, no.. The issue is not " level", but 'Ipresence".
1(2)23 We do not allege that administrative controls are inadequate,
' but that tech specs may be inappropriate.
1(2)24 Not relevant 1(2)25 -
1(2)26,.7,8 Not yet determined 1(3)1 Change in p=1e or grain - boundary fora.
1(3)2 " Islands" of intergranular attack 1(3)3,4.5 m. - As stated in #g Pg. 11 of GPUN Topical Report 008, Bev. 3
- As stated in Third Party Teview, 2/18/83, Pg. 8, # b
- b. - Because IGSC:: was found in areas of most severe ICA.
See SER, ATT 3, Pg. 2, #2.
" Severe cracking is usually rela 4ed
.to more severe IGA."
1(3)6,7,8 Kot yet determined 1(5)1 1 - Activ'e forms of carbon 2 - Unknown agents present in 'the RCS 3 - Any relatively inactive agent such as low valence sulfur or carbon ions present in otherwise innocuous concentrations acting in conceri, with a' synergist.
1(5)2.3 1
" Carbonates in the presence of oxidants at high temperature can produce IGA and IGSCC of Inconel 600."
SER - Third Party Review 2/18/83 Pg. 9 Recommendation 1 #1.
2 "Other conts.minants (lead, cercury, phosphorus *) can also induce IGSCC", Id.
Cne t,an reasonably assune that this is not a closed set.
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3 - Ua.czncludd 'that synergictic cffcets hava not been c:nsidered by GPUN or NRC Staff on the basis,of available information.
- All oxidatien and reduction processes are subject theoreti ly to the effect of a synergist.
1(5)4,5,6,7 At this, point ~in* time I have no idea except to note that 1.
Concentrations of thiosulfate as low as 1 PPM can, under appropriate conditions, cause, IGA and IdSCC. -
2.
Synergistic effects have not been considered.
1(5)8 Nobody knows 1(5)9-12 Inapplicable 1(5)13 The effect of two (or more) agents acting together is greater than the sum of their individual effects.
(You really should know this')
1(5)14 I don't know, but more important, Licensee and staff don't either.
The answer lies in reasoned experimentation.
1(5)15,16 Not applicable 1(5)17 - same as 1(5)14 1(5)18,19 Not applicable 1(5)20 Answer not subject to prediction - rust be determined experimentally.
1(5)21,22 Not applicable 1(5)23 mr basis is not documentation but extensive work in the develop' ment of synergistic antioxidant systems at Bell Telephone laboratories.
- As a prinary cerroborative source, we would cite Dr. R. E. Hansen, l
retired from Sell labs, }hrzsy Hill E. J.
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1(5)24,25,26-same as 1(5)20 1(5)27 - You must have an error here, neaning 1(5)26 rather than 1(5)25 Fevertheless, there is no answer as in 1(5)20.
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1(5)28 - Et applicablo 1(5)29,31 riot yet determined
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