ML20040F778
| ML20040F778 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/22/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-79 10CFR-050.55E, NCR-CEB-79-18, NUDOCS 8202100298 | |
| Download: ML20040F778 (3) | |
Text
I TENNESSEE VALLEY AUTHORITY tj k(*g _
. 4 M[j'i,;
400 Chestnut Street Tower II
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January 22, 1982 dM/2/
- 2b Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - SEISMIC RESPONSE FOR PRIMARY bitANCH LINES MAY NOT BE CONSERVATIVE - NCR CEB 79 FINAL REPORT On May 7,1979, Milton Hunt, NRC-0IE Region II, was informed that the subject nonconformance was determined to be reportable in accordance with 10 CFR 50.55(e). This was followed by our interim reports dated June 7 and June 26, 1979, March 18, July.23, and October 15, 1980, and February 6, and August 18, 1981. Enclosed is our final report. TVA considers 10 CFR Part 21 to be applicable to this deficiency.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHCRITY L. M.'Milld, Man ger Nuclear Regulation and Safety Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 b
Mr. James McFarland (Enclosure) gy g
Senior Project Manager.
CJ Babcock & Wilcox Company p
P.O. Box 1260 g
h,e,d,5M/ g Lynchburg, Virginia 24505 2f 9
Q 6.B giggg V tr h $ ?: f 17 m
8202100298 820122 OFFICIAL CUPh PDR ADOCK 05000438
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{ o2_.l An Equal Opportunity Employer
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- Pogt 1 of 2 ENCLOGURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2
,4 SEISMIC RESP 0NSE FOR PRIMARY BRANCH LINES MAY NOT BE CONSERVATIVE NCR CEB' 79-18
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FINAL REPORT i
4 Description of Deficiency Babcock and Wilcox (B&W) specificatio'n 1391 provides TVA with response spectra for use in TVA primary system branch line analyses. Revisions 1 and 2 of this specification provided s'afe shutdown earthquake (SSE) spectra at a single damping value with >1astructions for TVA to use one-half of the SSE data as the, one-half SSE -(operating base earthquake) response spectra.
The damping value used to generate the response spectra was a composite modal damping holu9. Although B&W stated the composite value was in accordance with applic:Eole regulatory guides, the value was conservative only for all pipe sizes un$er S$E loadings. It was not conservative for all piping sizes under one-half SSE loadings. TVA interpreted the spectra as' being in accordance with the aoplicable criteria for all pipe sizes under all loadings and performed ' system analyses accordingly.
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l 1
A proposed revision 3 reflected refinement of spring rates along with other design chenges and provided new S3E and one-half SSE response spectra for several caraping values. TVA review of the revision 3 data indicates that the revisions 1 and 2 one-half SSE spectra may not be conservative for
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branch piping less than 12 inches in diameter.
Safety Implications Because of the unconservativ'e design, analysis the primary system branch lines which are 12 inches or less lin, diameter coul,d fail during an operatingxbase earthquake. These lines are part of a safety-related system and thus.a.feilure of the subject lines could adversely affect the safety j
of operations of the plant!
Correct 1ve Action t
Based on,B&W's calculation for the primary loop specification 1391R3, TVA reanalyzed the: attached piping to incorporate the changes. The Civil e
Engineering Branch (CEB),recently received the specification 1391R3 for review. Some of'the movements ' increased, some new spectra were added, and one set of spectra for the pressurizer increased significantly over the values presented'in the calculation package. Teledyne Engineering Services (TES) and PMB, Incorporated, reviewed their analysis of the new spectra and movements to. determine the effect on completed analyses.
TVA's review of the data and reanalysis, where required, is now completed.
Each problem affected was shown to be conservative or had the new data included. For a listing >of the problems affected, s, the attached list.
Response spectra computer files were updated Septsmber 3,1979. All analyses run subsequestl'y used the correct data. Any revisions or
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i modifications resulting from this reanalysis <will be handled as part of the routine design process. No other TVA plants _are'affected.
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ATTACHMENT Problem New Data Included or Old Data Number
- Analyst LConsertative (Reference)-
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1NV-N TES Yes (TES Report TR-2160-17 Rev A 3/1/80)~~
2NV-N TES Yes (TES Report TR-2160-40 Rev A 3/1/80) 1NV-0 TES Yes -(TES Report TR-2160-17 Rev A 3/1/80) 2 NV-0 TES Yes (TES Report.TR-2160-24 Rev A 3/1/80) 1NV-P TES Yes (TES Report TR-2160-17 Rev A 3/1/80) 2NV-P TES Yes (CEB 790814 015) 1NV-Q TES Yes (TES Report TR-2160-22 Rev A 3/10/80) 2NV-Q TES Yes (TES Report TR-2160-39 Rev A 3/1/80) 1KC-G TES Yes (CEB 811216 265) 2KC-G TES Yes (TES Report TR-2160-36 Rev A 3/20/80) 1KC-H TES Yes (TES Report TR-2160-37 Rev A 4/23/80) 2KC-H TES Yes (TES Report TR-2160-38 Rev A 4/18/80)
ISM-K:
TVA Yes (Confirmed per JCCornwell memo on 12/31/81) 2SM-L:
TVA Yes (Confirmed per JCCornwell memo on 12/31/81) 1CF-A:
PMB Yes (CEB 810812 255)^
1CA-E TES Yes (CEB 790928-002 and 790905 019) 2CA-E TES Yes (CEB 790928 002) 1CA-F TES Yes (CEB 790928 002) 2CA-F TVA Yes (Confirmed-per JCCornwell memo on 12/31/81) 1NV-C:
TES Yes (TES Report-TR-2160-12 Rev A 7/3/81) 1NV-F:
TES Yes (CEB 790814 015) 1NV-J:
TES
_Yes (CEB 790814 015) 1NV,K:
.TES Yes (TES Report TR-2160-31 Rev A 5/2/80) 1CR-H:
TES Yes (TES Report TR-2160-51 Rev D 4/22/80) 1CR-I:
TES Yes (TES Report TR-2160-51 Rev D 4/22/80) 1NK-A:
TES Yes (CEB 811216 265) 1NK-C:
TES Yes (TES Report TR-2160-47-Rev A 6/2/80) l 1NK-D:
TES
-Yes (TES Report TR-2160-44 Rev A 2/27/80) 1NK-E:
TES Yes (TES Report TR-2160-45 Rev A 5/14/80 1NK-F:
TES Yes 1NK-G:
TES Yes 1ND-C:
TES Yes (TES Report TR-2160-9 Rev B 4/24/80) 1ND-D:
TES Yes (TES Report.TR-2160-9 Rev B 4/24/80) 1ND-E:
TES Yes (CEB 790814 015) 1ND-F:
PMB Yes 1ND-L:
PMB Yes (CEB 810812 255)
" Colon represents unit 2 analyses opposite hand.
- The 1391R3 spectra and movements were not used.
Note:
TES reviewed problems analyzed to the B&W calculation package against 1391R3 PMB's review was of 1391R3 against the current analysis.
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