View source for U-600590, Part 21 & Deficiency Rept 21-85-18 Re Anchor/Darling,Velan, Atwood-Morill & Walworth Valve Cos 410 Stainless Steel Valve Stem Corrosion Failures.Valves Tested for Stem Hardness & Cracks & Hard Stems Replaced

{{Adams
| number = ML20199C501
| issue date = 05/28/1986
| title = Part 21 & Deficiency Rept 21-85-18 Re Anchor/Darling,Velan, Atwood-Morill & Walworth Valve Cos 410 Stainless Steel Valve Stem Corrosion Failures.Valves Tested for Stem Hardness & Cracks & Hard Stems Replaced
| author name = Hall D
| author affiliation = ILLINOIS POWER CO.
| addressee name = Keppler J
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| docket = 05000461
| license number = 
| contact person = 
| case reference number = REF-PT21-86, REF-PT21-86-232-000
| document report number = 21-85-18, PT21-86-232, PT21-86-232-000, U-600590, NUDOCS 8606180179
| document type = DEFICIENCY REPORTS (PER 10CFR50.55E &amp; PART 21), TEXT-SAFETY REPORT
| page count = 6
}}

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    '                                                                             U-600590 Ll6-86(05 - 28 )-L 1A.120 ILLIN018 POWER COMPANY.
CLINTON POWER STATION. P.O. BOX 678, CLINTON, ILLINOIS 61727
.                                                 May 28, 1986 Docket No. 50-461 Mr. James G. Keppler Regional Administrator, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road
          -Glen Ellyn, Illinois    60137

==Subject:==
10CFR21 Defect 21-85-18:
410 S.S. Valve Stem Corrosion Failures

==Dear.Mr. Keppler:==

On November 11, 1985, Illinois Power Licensing and Safety Department received a 10CFR50.55(e)/Part 21 referral from
;          Illinois Power Nuclear Station Engineering Department concerning 410 stainless steel valve stem corrosion failures. Based on an evaluation of this matter, Illinois Power Company is providing the following information to the Commission in accordance with the requirements of 10CFR Part 21.21(b)(3).
(i)  D. P. Hall, Vice Presi(ent of Illinois Power Company, by means of this report.
(ii)  The basic components involved in this reportable defect are valve stems and shafts manufactured from Type 410 Stainless Steel (S.S.) that were improperly heat treated.
(iii)  The valve stems and shafts are supplied by the following valve manufacturers:
Anchor / Darling Valve Company 701 First Street
'                                P.O. Box 3428 Williamsport, Pennsylvania 17701-0428 Atwood-Morill Valve Company
[
285 Canal Street                                                                       '-
Salem, MA      01970 l
Velan Valve Company Griswold Industrial Park Wiliston, Vermont 05495                                         NAY 3 0 EOS Walworth Valve Company Huff Avenue Greensberg, PA 51601                                                          )\
                                                   ~
!                         8606180179 860528 PDR ADOCK 00000461                                                                  \g{k v
S                PDR _

r U 600590 Ll6-86(05- 28)-L 1A.120 (iv)  .The nature of the defect involves stress corrosion failures of type 410 S.S. valve stems and shafts. This defect is associated with excessive hardness (in excess of 30 Rockwell C) caused by improper heat treatment.
Although type 410 S.S. is defined as a stainless steel because of its alloy content, it is also a high chromium, very hardenable steel.      Cooling this material in air from the 1900 to 1700*F temperature range results in a surface hardness of up to HRC45 and high internal stresses. This practice results in low and erratic impact properties and poor resistance to stress corrosion which can result in cracking which occurs in areas where there could be a concentration of corroding chemicals, such as at gland packing.
'                  One hundred and sixty-six valves were identified (see Attachment 1) as active valves with type 410 stem or shaft material. Upon inspection, fourteen (14) of these valves were determined to have "hard stems" (in excess of a 30 Rockwell C). The failure of these thirteen valves could render the High Pressure Core Spray, Low Pressure Core Spray, Reactor Core Isolation Cooling, Shutdown Service Water, RHR "C" Loop and Reactor Feedwater Systems inoperable.
Failure of the above systems would impact operability of all the Emergency Core Cooling Systems.
                                                       ~
Furthermore, the failure of lE22-F010 and F011 could violate the Off Site Dose Release Rate (10CFR100 Limits). This violation could occur if a LOCA required the HP system to draw from the suppression pool and the 1E22-F010/F011 valves had failed-open, permitting the radioactive suppression pool water to be released to the RCIC tank.
Based on the above review, this defect could have resulted in a condition which could have created a substantial safety hazard and is therefore evaluated to be reportable under the provisions of 10CFR21.
(v)   July 17, 1985, I.E. Information Notice 85-59.
(vi)   The quantity and location of the valves identified as having type 410 S.S. stems with excessive hardness are listed in Attachment No. 2.
(vii)   One hundred and sixty-five (165) of the one hundred and sixty-six (166) safety related active valves with type 410 S.S. stems or shafts identified in Attachment #1 were tested for stem hardness. This testing identified fourteen (14) valves with "hard stems" (in excess of a 30 Rockwell C). The fourteen (14) "hard stems" were
* U 600590
         -                                                           Ll6-86( 05-28 )-L 1A.120 ultrasonically tested (UT) or liquid penetrant (LP) tested to determine if the stems were cracked. Based on the results of these tests no cracked stems were identified. Although no cracked stems were identified, Illinois Power Company will replace the. fourteen (14)
                     "hard stems" during the first scheduled outage after replacement stems have been received. One (1) valve stem (1B21-F032A) remains to be tested. Testing of this stem will be completed by June 15, 1986. This stem will also be replaced at the first scheduled outage if testing shows that the hardness is in excess of a 30 Rockwell C. UT or LP testing will also be performed on the stem if the hardness is in excess of 30 Rockwell C.
(viii)    General Electric has provided information concerning the effects of Intergranular Stress Corrosion Cracking (IGSCC) on type 410 S.S. This information was provided in General Electric's Valve Failure Analysis Letter CSI-625-85.
Our Evaluation of this reportable defect is available for your review at our offices. I trust that this letter provides sufficient information for your review and analysis of the problem.
Sincere        yours,
                                                  .   . Hall Vice President RLC/pjr Attachments cc:   USNRC Resident Office Illinois Department of Nuclear Safety Director of Inspection and Enforcement (3 copies)
INPO Records Center Anchor / Darling Valve Company l
!-             Atwood-Morill Valve Company
!              Velan Valve Company Walworth Valve Company

n
                  .                                                      Attachm:nt #1 (*)      <
          .,_            .                                                    Shast 1 of 2
                ~
SAFETY RELATED ACTIVE VALVES WITH TYPE 410 S.S. STEMS OR SHAFTS Valve No. . System     MWR            Valva No.       System    MWR
: 1. 1B21-F016     MS     B24285     47. 1E12-F027A      RH     B31197
: 2. 1B21-F019     MS     B24286     48. 1E12-F027B       RH    B31198
: 3. 1B21-F032A MS        B35523     49. 1E12-F028A      RH     B31199
: 4. 1B21-F032B MS        B35524     50. 1E12-F028B       RH    B31200 4                5. 1B21-F010A MS        B35521     51. 1E12-F031A      RH     B31201
: 6. 1B21-F010B MS        B35522     52. 1E12-F031B       RH    B31202
: 7. 1B21-F065A MS        B24287     53. 1E12-F031C      RH     B31203
                     .8,   1B21-F065B MS        B24288     54. 1E12-F041A       RH    B31204
: 9. 1B21-F098A MS        B24292     55. 1E12-F041B      RH     B31205
: 10. 1B21-F098B MS        B24293     56. 1E12-F041C       RH    B31206
: 11. '1B21-F098C MS          B24294     57. 1E12-F042A      RH     B31207
: 12. 1B21-F098D MS        B24295     58. 1E12-F042B      RH     B31208
: 13. ICC049        CC     B24296     59. 1E12-F042C      RH     B31209
: 14. ICC050        CC     B26650     60. 1E12-F047A      RH     B31210
: 15. ICC053        CC     B26651     61. 1E12-F047B      RH     B31211
: 16. ICC054        CC     B26652     62. 1E12-F050A      RH     B31214
: 17. .1CC057-         CC     B26653     63. 1E12-F050B      RH     B31216
: 18. ICC060        CC     B26654     64. 1E12-F064A      RH     B31217
: 19. ICC065        CC     B26655     65. 1E12-F064B      RH     B05975
: 20. ICC067       iCC     B26656     66. 1E12-F064C      RH     B31218
: 21. ICC068        CC     B26657     67. lE12-F068A-     RH     B24219
: 22. ICC070        CC     B26658     68. 1E12-F068B      RH     B24220
: 23. ICC071        CC     B26659     69. 1E12-F094        RH     B31223
: 24. ICC072        CC     B26660     70. 1E12-F096       RH     B31225 25.-   ICC073        CC     B26661     71. 1E12-F105        RH     B31226
: 26. ICC074        CC     B26662     72. 1E21-F001        LP     B26053
: 27. ICC127        CC     B26667     73. 1E21-F003        LP     B31176
: 28. ICC128        CC     B26668     74. 1E21-F005      - LP     B26054
: 29. Deleted       CC                75. 1E21-F006        LP     B31178
             +-     30. Deleted       CC                76. IE21-F011        LP     B26055
: 31. 1CY016        CY     B26672     77. 1E21-F303        LP     B31177
: 32. ICY 017       CY     B26673     78. 1E22-F001        HP     B26688
: 33. 1CY020        CY     B26674     79. 1E22-F004        HP     B26689
: 34. ICYO21        CY     B28861     80. 1E22-F005        HP     B26690
: 35. 1E12-F004A RH        B31186     81. 1E22-F010        HP     B26691
: 36. 1E12-F004B RH        B31187     82. 1E22-F011        HP     B26692
: 37. 1E12-F006A RH        B31188     83. 1E22-F012        HP     B26693
: 38. -1E12-F006B RH          B31189     84. 1E22-F015        HP     B26694
: 39. 1E12-F008     RH     B28885     85. lE22-F023        HP     B26695
: 40. IE12-F009     RH     B28886     86. 1E22-F024        HP     B26696
: 41. 1E12-F014A RH        B24217     87. 1E32-F006        HP     B28887
: 42. 1E12-F014B RH        B24218     88. 1E32-F007        IS     B24215
: 43. IE12-F024A RH        B31193     89. 1E32-F008        IS     B28889
: 44. 1E12-F024B RH        B31194     90. 1E32-F009        IS     B24216
: 45. 1E12-F026A RH        B31195     91. 1E51-F010        RI     B31227
: 46. 1E12-F026B RH        B31196
* Following a review of the docketed PVORT information (Number 50-461, dated October- 10, 1985) of active safety valves and applicable vendor drawings, 168 valves have been identified as having type 410 stainless steel material.

(..
         ,.                                                             Attcc'h ment il Shtst 2 of 2 Valve No. System       MWR              Valve No. System     MWR
: 92. 1E51-F013      RI      B31228      138. ISX089B        SX       B24170
: 93. 1E51-F031      RI      B31230      139. ISX095A        SX       B24172
: 94. 1E51-F059      RI      B31231      140. ISX095B        SX       B24171 95._1E51-F063      RI      B31232. 141. ISX096A        SX       B24175
: 96. 1E51-F064      RI      B31234      142. ISX096B        SX       B24174
: 97. 1E51-F066. RI          B31235. 143. ISX097A        SX       B24176
: 98. 1E51-F068      RI      B31236      144. ISX097B        SX      -B24178
: 99. 1E51-F078- RI          B31238      145. ISX105A        SX       B24275 100. 1G33-F001      RT      B31240      146. ISX105B        SX       B24276 101. 1G33-F004      RT ~    B31241    ,147. ISX107A         SX       B24230 102. 1G33-F028      RT~     B31242      148. ISX107B        SX       B24231 103. 1G33-F034      RT      B31243    .149. ISX173A         SX       B24227 104.'1G33-F039      RT      B31244      150. ISX173B        SX       B24225 105. 1G33-F040      RT      B31245      151, 2SX073A        SX       B24234 106. 1G33-F051      RT      B31246     '152. 2SX073B        SX       B24235
            =107. IG33-F052A RT          B31247      153, 2SX076A        SX       B24236 108. IG33-F052B RT          B31248      154. 2SX076B        SX       B24239 109. 1G33-F053      RT'     B31249      155. 2SX107A        SX       B24240 110. 1G33-F054      RT     'B31250      156, 2SX107B        SX       B24241 111.'1FP050         FP     -B24196      157. IVP004A        VP       B24179 112.' 1FP051        FP      B24194      158. IVP004B        VP       B24180 113. 1FP052         FP      B24197      159. IVP005A        VP       B24181 114. 1FP053         FP      B24198      160. IVP005B        VP       B24182 115.-1FP054         FP      B24279      161. IVP014A        VP       B24183 116. 1FP078         FP      B24199      162. IVP014B        VP       B24184 117. 1FP079         FP      B24200      163. IVP015A        VP       B24185 118. 1FP092         FP      B26687      164. IVP015B        VP       B24186 119. OMC009        .MC     .B31179      165. 1W0001A        WO       B31284 120. OMC010         MC      B31180      166. 1W0001B        WO       B31285 121. ISF001         SF. B05971      167. '1W0002A       WO       B31286 122. ISF002         SF      B31251      168. 1WOOO2B-       WO       B31287 123. ISX016A        SX      B31277 124. ISX016B        SX      B24278 125. ISX071A~       SX      B24280 126. ISX071B        SX      B24268 127. ISX073A        SX      B24269 128.-1SX073B        SX     'B24270 129. ISX074A        SX      B24271 130. ISX074B        SX      B24272' 131. ISX076A        SX      B24273
.            132. 1SX076B SX      B24274 133. ISX082A        SX      B24223 134. ISX082B      -SX       B24224 135. ISX088A        SX      B24167 136. 1SX088B        SX      B24168            '
137. ISX089A        SX      B24169

E                            .
Attachmnnt #2 e'.,'
o Valves Requiring Stem.
Replacement Valve No.
: 1. 1E22-F001
: 2. 1E22-F004
         '3. 1E22-F010
: 4. 1E22-F011
: 5. 1E22-F012
: 6. 1E22-F015
: 1. 1E51-F010 l           8. 1G33-F040                         -
i
{           9. ISX ,105A
: 10.       1E21-F006
: 11.       1E12-F041C
: 12.       1E51-F066 i-     13.       1B21-F032B 14 .. 1E12-F050B l
l l
1 l, -
                                                 -}}