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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
	ML20199C501
Person / Time
Site:	Clinton
Issue date:	05/28/1986
From:	Hall D; ILLINOIS POWER CO.
To:	James Keppler; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
	REF-PT21-86, REF-PT21-86-232-000 21-85-18, PT21-86-232, PT21-86-232-000, U-600590, NUDOCS 8606180179
	Download: ML20199C501 (6)
	v • d • e

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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

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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 )\

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! 8606180179 860528 PDR ADOCK 00000461 \g{k v

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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.

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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

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. Attachm:nt #1 (*) <

.,_ . Shast 1 of 2

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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.

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,. 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