ML19260A097
| ML19260A097 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/03/1977 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Arnold R METROPOLITAN EDISON CO. |
| Shared Package | |
| ML19260A098 | List: |
| References | |
| NUDOCS 7910290717 | |
| Download: ML19260A097 (3) | |
Text
.,
J ISTRIBUTION:
May 3, 1977 V5Tello KRGoller TJCarter Docket No.:
50-289 Attorney, OELD CI&E(3)
RWReid GZwetzig RIngram Metropolitan Edison Company DEisenhut ATTN: Mr. R. C. Arnold TBAbernathy Vice President - Generation JR8uchanan P. O. Box 542 ACRS(16)
Reading, Pennsylvania 19603 Gray File Ger" emen:
By let':er dated October 1,11976, you submitted a report relating to Three Mile Island Unit No.1, entitled " Reactor Containment Building Ring Girder Surveillance Test Two Years After S.I.T."
We are currently reviewing this report. However, we find that before we can complete our review, we will r.eed additional information, as indicated in the enclosure. Accordingly, you are requested to submit one signed original and 39 copies of the information listed in the enclosure within 30 days.of receipt of this letter.
l Sincerely, Ori7inal siened by Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
Request for Additicaal Information cc w/ enclosure:
See next page 1479 313 V'
ATC7
/
ORB 4:DdR C-0RB#,4TDOR__
l l
or rice,
~ m?~-
__ _ _________T GZwetzi 7WReid
___ __ _ _ _ _ _ _g : d n________
g ______ _ _ _ _ _ _ _ _ _ _ _ _
suanaue >
_ _ _ _!_^__ _ _ _ _ _ _
f_
DATE D NRC Form 318 (2 76) NRCM 02040 c v.s. sov ensucN r pa:N tis s or ric E: is7s.e34 rea 3910290 7/ 7 o
j
lbtroralitan Edi nn Conpany cc:
G. F.
T ro ch ri;!'m, Cs o.
Shaw, Pi tt "e 1600 il St re,"t,. Fo r t s,.' T rowb r i.r.,'e ti. '. '.
1.'a s hi n g to n, 11 C.
200.$ 6 GPU Service Corporation Richard !!. iM.med, Prniect ManMer Thoria: 11. Crimi n s, Jr., Sa fe ty and Licensinq lbnager 260 Cherry 1:ill Road Parsippany, f.'a! Jers'ey 07054 D
D N^
fff/!kblZ'hfj\\h(('? 'r Pennsylvania Electric Cr '; any
'-*o l',r.
P..
W. Co n rad d ull%
Vice Presi'!cnt, Generation 1031 Croad Street Johnstown, Pennsylvania 15907 fir. Ueldon R. Arehart, Chairaan Board of 5t';mrvisors of I.ondond;r,y T ot en shi:'
RFD #1, Geyers Church Road liiddletown, Pennsylvania 17057 11iss liary V. South *rd. Chairman Litizens for a Safe Environ, cat P. O. Box 405
!lerrisbur.7, Pennsylvenia 17108 Governnont Publications Section Stat? Library of P' nnsylvani) 5 0). Inul (Er.ov. tic n evil ding)
H,irri saur g. Pennsyl v n. ia 17126 1479 314
.'HREE MILE ISLAND UNIT NO. 1 REACTOR BUILDING RING GIRDER SURVEILLANCE TEST TWO YEARS AFTER STRUCTURAL INTEGRITY TEST REQUEST FOR ADDITIONAL INFOPJ4ATION 1.
Figure 3 of the referenced report shows areas where the ring g1rder
" facing" has broken away.
Describe the function of the " facing".
It is not clear whether it is part of the structural concrete or a fascia.
If the " facing" is not structural, provide assurance that eventual cracks can be uncovered during visual inspection.
If the " facing" is structural address the effect of the spalling on the structural integrity of the ring grider.
Indicate the depth and area of the broken away " facing".
2.
In Tsble 4, Note 4 it is indicated that small cavities were found in the vicinity of tendon bearing plates 149 and 225. Describe these cavities. Indicate their location with respect to the tendon in a sketch.
present a discussion of their effect on the margin of safety and present a suggested method of repair.
3.
Figures 6 thru 12 present sketches of seven voids which were found around the dome tendon bearing plates.
a.
Explain why these voids were not discovered during previous inspections.
b.
Outline the procedure by which the effect of the voids on the structural intecrity has been evaluated.
Address the fact that the voids will act as stres.5 raisers and therefore may generate future cracks.
Discuss environmental factors that may facilitate local damage.
In light of these concerns, address the effects on the original fact:r of safety of the design.
Discuss in detail the approach used to predict losses in tendon force.
c.
Present the acceptance criteria used in the evaluation.
d.
Provide a tinetable for the repair of these voids. Outline the repair procedure and discuss the impact of any delay in the repair schedule.
I?~
D "fl3 @f5 P Y %I)I' b 1479 315 dn Mk