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5epteder 2,1993 80ETEC-Dar.3747 l
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Mr. R. J. Bosnat. Chief i
- sechanical Engtaeering tr ach 1
Olvision of Eng' w ring
'J. 5. Nuclear Regulatory Commission tsashington, 3. C.
205S5
Subject:
Sussery of Secumeets Subettted to NPC by ETEC Concersing Ihe 91diend Plant twits I and 2
References:
- 1) Ltr 80.E IC.Olt.0123.
- Review of Response to 10 Crt 50.54 l
Aequest a Plant Fall for Mie!and Plant. Units I and 2".
t J. O. Sa.es to A. J. Capoucci. January 17. 1980
- 2) t.t* 30.C*tc.0tf 0650 *E!!C review sf 0*if t MES Sit for
- dland 8? ant twits I and 2*, J. G. Sates to 4. J. 90sn44, recruary 21 li'0 l
- 3) Ltr 30 C*IC.00F.31H 'te,tew of tacergecund UttItttas Sect'en :f 'InteragenC1 A reesent to. WC 03 79167 i
l Test 40.1. Misland Pla.it 1)n'ts 1 and 2. Swetask 1o.1 i
Letter Aest.rt** J. O. Sates to A. J. Capovect Jw!f 20 l*90 l
Cear W. 80saet:
I
?er !Me mw9t 68 "P. A. J. Casoucci. Jr. sme'es o' the docuneats 196
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mitted by ['IC ts iAC. 8(8 concer9tn1 the Mitland 314at 'Jntts I and 2 are eactosed.
N #cuments twenitted are Refervaces 1 tnreuga 11isted above.
Sfacerelyfours, J. +). i ti Er**)Pte Manager (ner17 Pa*gra*s Of f tce (eerty Ieenclyy [91tnevelng " enter tectosure As %ted M03
- c w/eact.:
- 4. '.. Irwwwe 18C A. J. C400 4t. %*C t
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C tnclowO to: ou seat unt n ot September 2,1980 Page 1 SQ9%RY OF 00CM11TS SUIMITTED TO UC 3Y ETEC CONCEMING T4 N:0LMD UNT Ut!TS 1 At0 2
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l Reference 1 This is a review of Censumer Power Congany responses to Questions i
16-20af the NRC 10 CR 50.54tf) Revision 2 dated July 9,1979.
These questions concerned tne effect of the plant fill settlement on the unde ground piping.
- n the review, coecern was espressed
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over the fo' lowing itens:
a) Bwkling or tripolfrg were not considered as failure modes.
b) The stresses mere based on the current pipe profiles ane not the espected differential settlegnt over the i
ll'e of the p! ant.
j c) The method outlined for calculating the stres:es in I
the de'or vd 3iping eas rot paaticklarly appitcable for the prof f!ed Dictng.
i d) What is to be tano 18 stresses aporoach or esceed code al'3webles.
e) The differential settlemnt betneen stoir.g and butiding at areas of penetrat'cn.
f) The additional loadtag that 9ay be letosed on active casoonents due to dt*ferential settleatnt.
i Some of thet! Sane concerns were agetn enortssed in Deference 3 based on latter revisions to Consu'ers cuer Congany responses.
e Reference 2 The draf t Sa'ety Evaluation Recort retpared by the NilC MER Staff based en the Misland I and 2 F5M throug'i revision 21 was reviewed.
It was found to be current 41in respect to the FLut with no changes being reouf red at the time.
The major remaining Jnresolved issues were:
- 1) AsymetelC cJvt t/ press 4*lil'.ic9
- 2) The ef fect of 'Jutidiej setttemnt scor-McManical components.
- 3) $etuilc qualif' cation of 'necian' cal ard electrical equipment, i
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- 4) The tor 91ef ton of the C06r'Mt3ry analysts.
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i Enclosure to: 80 ETFC-CRF.3747 l
Septen6er 2 1980 l
fage2 3
I Reference 3 Section g of the referenced report was reviewed and in general ETEC concurred with the concerns expressed tNrein. A simisry of our coments follow:
a) Methods of measuring in situ stresses in the pipes j
should be investigated.
b) 6ased on an alastic analysis, our calculations show mah stresses as high as 212.000 pst in the buried pipe whe eas the mant:vn stress cal:ulated by CPC is 27 XX) pst. These stresses are beNing stresses based i
on the pipe profiles, j
c) Strasses other than bending stresses are also of con.
- i cars. The external crushing loads required to cause j
the olpe to deform with a relatively sharp radius of curvature, as shown in som areas of the profiled ploes. util be high, *his c:uls fehce hi p stresses and focal crfgoling, d?
I Local cr*:pling can a'ss xcur :d ts the 'ilgn bending f
stresses, sadden changes in slece such as at butiding peeetrations. attachse9ts to heavy eeulpment and sharp dias in the pipe profile.
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