ML19289D186
| ML19289D186 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/20/1979 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Parr O Office of Nuclear Reactor Regulation |
| References | |
| 070, 70, NUDOCS 7902230182 | |
| Download: ML19289D186 (3) | |
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VinoINIA E LECTICIC ANI) POWE C O311% NY IIIc rut o xii. VI It GINI A 23201 February 20, 1979 Mr. Harold R. Denton, Director Serial No. 070 Of fice of NucIcar Reactor Regulation LQA/ESG:esh Attn:
Mr. O. D. Parr, Chief Light Water Reactors Branch No. 3 Doci:et No. 50-339 Division of Project Management U. S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Denton:
During telephone conversations with Mr. A. W. Dromerick, of the NRC Staff, on November 28 and December 12, 1978, we provided information concerning the qualification tests which were per formed on the reactor vessel bolting material for North Anna Unit No. 2.
This letter documents and supplements the information given to Mr. Dromerick.
The North Anna Unit 2 reactor vessel bolting material qualifica-tion tests were performed in accordance with the 1969 Winter Addenda of the ASME Code Section ill, which required meeting an average of 35 f t-Ibs energy with no lateral expansion tests and no maximum tensile strength limitation.
Charpy tests were performed at 100F as required by the Code. All the North Anna Unit 2 bolting material met the ASME Code requirements. The results of the tests are shown in the attachment.
The current 10 CFR 50 Appendix G minimum requirements are 25 mils lateral expansion and 45 f t-lbs in terms of Charpy V-Notch tests conducted at the preload temperature or at the lowest service temperature, whichever temperature is lower.
Data available on stud material over a range of temperatures indi-cate that impact energy, as well as lateral expansion, values at a test temperature of 50 F will be higher than those obtained on the same material tested at 10 F.
Therefore, it is expected that the North Anna Unit 2 bolting materials would exhibit at Icast 45 fr-lbs if tested at 500F, which is con-sidered to be the lowest preload or service temperature.
In addition, although lateral expansion measurements for the North Anna Unit 2 bolting material are not available, it is expected that these materials would exhibit at 1 cast 25 mils if tested at 500F, 730.>d O Ok k
a voman tuniac asa l'owru coeur to Mr. Ilarold R. Denton 2
We trust that this information will be useful to you Tc. your review.
Very truly yours,
/
/,'
b bl G Y
g C. Brown, Jr.
Senior Vice President-Power tat /on Enginee' ring and Constructipn/
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Attachment:
North Anna Unit 2 Closure Ifead Bolting Material Properties
ATTACHMENT NORTH ANNA UNIT 2 CLOSURE HEAD BOLTING MATERIAL PROPERTIES CLOSURE HEAD STUDS 0.2% YS UTS Elong.
RA Energy at 100F Heat No.
Grade Bar No.
KSI KS!
BHN FT-LBS 34385 AS40, B24 733 158.1 170.4 16.0 57.8 321 39, 37, 36 34385 A540, B24 733 152.1 168.4 16.0 55 0 341 34, 38, 38 34385 AS40, B24 734 154 3 168.4 15.8 54.0 321 42, 42, 43 34385 A540, B24 734 153.4 165 1 16.0 59.0 341 49, 51, 43 34544 AS40, B24 807 155 3 169.4 19 2 59.2 321 43, 42, 43 34544 A540, B24 807 152 3 166.8 19.0 59 4 341 45, 42, 42 34544 AS40, B24 808 150.2 166.4 18.8 57.7 321 41, 41, 40_
34544 A540, B24 808 153.9 168.1 19.0 57.7 341 43, 44, 42 34544 A540, B24 811 150.0 166.8 19,2 59.4 321 44, 44, 44 34544 A540, B24 811 151.0 166.8 19.4 59.4 341 46, 43, 45 CLOSURE HEAD NUTS & WASHERS Y7981 AS40, B24 T22 137 5 153 6 18.0 321 47, 48.5, 45 Y7981 A540, B24 T23 140.4 157.4 18.0 331 41, 44, 41 Attachment to Vepco letter 070 02-20-79 i
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