ML17059B667
| ML17059B667 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/22/1997 |
| From: | Agosta C, Alvi M NIAGARA MOHAWK POWER CORP. |
| To: | |
| Shared Package | |
| ML17059B657 | List: |
| References | |
| S.0SEWS9635, S.0SEWS9635-R, S0.0SEWS9635, S0.0SEWS9635-R00, NUDOCS 9708070147 | |
| Download: ML17059B667 (8) | |
Text
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~E NUCLEAR ENGINEERING @~,-',;,',,:,",,'gq~'",","~gg;,,'j""'>>-'-s';;Ra<4~a~at;,'-;.WTZ~~='.i'.=-'~N's'.'s ".:::o.; ei INT NUCLEAR STATION . Unit (1, 2 or 0=Both): 1 DlsclPllne: STRUCTURAL Title Calculation No.
SCREENING EVALUATIONWORK SHEETS FOR TANK 96-35 SO.OSEWS9635 (Sub)system(s) Building Floor Elev. Index No.
CARMEN R. AGOSTA Checker(s) I Approver(S) lhOAI),g~
Design Rev Descrl tion Chan eNo. 8 Date Chk Date A Date 00 INITIALISSUE NA -2z.-97 >?-A7 Computer Output/Microfilm Flied Separately (Yes/No/ NA): NA Safety Class (SR / NSR I Qxx): SR Superseded Document(s): NONE Document Cross Reference(s) - For additional references see page(s): NA Ref Doc D c ment No T Index Sheet Rev NER-1S-012 NER 00 2 SO.OSQUGANCHOR CALC SO.O 00 3 SO.OSEWS9604 CALC SO.O 00 General Reference(s):
- 4. GENERIC IMPLIMENTATIONPROCEDURE (GIP)
- 5. NMPC Letter to NRC, File Code NMP1L 1044, dated March 11, 1996 Remarks:
NONE Confirmation Required (Yes/ No): No Final Issue Status File Location Operations Acceptance See Page(s): ( APP I FIO I VOI ): APP ( Gale/ Hold ): Calc Required ( Yes/ No ): No Evaluation Number(s) I Revision: NR Component ID(s) I EPN(s) I Line Number(s):
Copy of Applicability Review Attached (Yes/ N/R)?N/R TANK-96-35 TANK-9644 Key Words: NMP-1, STRUCTURAL, SQUG, SEWS, SEISMIC VERIRCATION
¹ FORMAT NEP-DES-08-F01 40 9708070i47 9707M 05000220 PDR ADQCY "etk-
EI Y NIAGARA I% 0 MOHAWK NUCLEAR ENGINEERING Nine Mile Point Nuclear Station CALCULATIONCONTINUATION SHEET Unit: 1 Disposition:
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Originator ate Checker/Date CaicutaUon No. Revishn PP z.-~ a-W> A7 SO.OSEWS96-35 00 ef.
PURPOSE'ocument the Screening Evaluation Work Sheets (SEWS) for the DSAlDG¹103 START AIR TANK¹4, equipment number 96-35.
This SEWS has been prepared as part of the commitment to use the SQUG (GIP) methodology to document the seismic adequacy of SSEL components.
CONCLUSION: Tank-96-35 is similar toTank-96-04. The anchor analysis is documented in calculation SO.OSEWS9604 for these tanks. This calculation concluded the anchorage can withstand 4.207 times greater the seismic demand. The cinch anchors passed the tightness check for tank 96-35. Therefore, the SQUG outlier for 96-35 is resolved.
ATTACHMENTS A. SEWS for Equipment ID Number 96-35 B. The Outlier Seismic Verification Sheet (OSVS) for Equipment ID Number 96-35 FORMAT ¹ NEP-DES48, Rev. 01 (F02)
GIP Rev 2, Corrected, 2/14/92 SCREENING EVALUATIONWORK SHEET (SEWS) Status: Yes Sheet 1 of 1 ID: 96-35 (Rev. 1) Class: 21 - Tanks and Heat Exchangers
Description:
DSA/DG ¹103 START AIR TANK¹4 Building: TB Floor El.: 261.00 Room, Row/Col: DG 103 RM Manufacturer, Model, Etc.:
BASIS: External analysis ATTACHMENT CAI.C NO REVISION o PAGE NO
- 1. The buckling capacity of the shell of a large, flat-bottom, vertical tank is equal to or greater Yes than the demand.
- 2. The capacity of the anchor bolts and their embedments is equal to or greater than the Yes demand.
- 3. The capacity of connections between the anchor bolts and the tank shell is equal to or Yes greater than the demand.
- 4. Attached piping has adequate flexibilityto accommodate the motion of a large, flat-bottom, Yes vertical tank.
- 5. A ring-type foundation is not used to support a large, flat-bottom, vertical tank. N/A C
MjHKHIR SRT are W. Djordjevic and C. Agosta - Outlier Evaluation In Revision 0, these air start tanks were declared outliers because they use Cinch type leaded anchors which are not covered by the GIP.
External analysis 95C2873-C-003 evaluates the anchorage using data developed by Westinghouse Savannah River (referenced in calculation) and shows a HCLPF PGA equal to 0.55g.
/8a Subsequently, bolt tightness checking was conducted on.~accessible Cinch anchor installations with only one failure hold tightness. Since this failure rate is lese-then 1% and the HCLPF is equivalent to about a 1% failure @'7 rate, no reduction factor is applied to Cinch anchors.
Therefore, this equipment is found acceptable for A<6 design basis purposes and the outlier is resolved. The HCLPF remains at 0.55g PGA.
Evaluated by: Date:
'/7 ig
'v Niagara Mohawk Power Corporation - Nine Mile Point 0 GIP Rev 2, Corrected 2/14/92 OUTLIER SEISMIC VERIFICATION SHEET (OSVS) Sheet <<f 2 ID: 96-35 (Rev. 0) Class: 21. Tanks and Heat Exchangers
Description:
DSA/DG ¹103 START AIR TANK¹4 Building: TB Floor El.: 261.00 Room, Row/Col: DG 103 RM ATTACHMENT CALC NO REVISION PAGE NO
- a. Identify all the screening guidelines which are not met. (Check more than one if several guidelines could not be satisfied.)
Shell Buckling Anchor Bolts and Embedment Anchorage Connections Flexibility of Attached Piping Other
- b. Describe all the reasons for the outlier (i.e., if all the listed outlier issues were resolved, then the signatories would consider this item of equipment to be verified for seismic adequacy).
Air start tanks are anchored to reinforced concrete wall by Cinch (leaded) type anchors. Cinch type anchors are not covered by the GIP.
- a. Defined proposed method(s) for resolving outlier.
Determine realistic bolt load allowables for Cinch type anchors and compare them to the seismic demand loads, or retrofit anchorage.
- b. Provide information needed to implement proposed method(s) for resolving outlier (e.g., estimate of fundamental frequency).
The information on this OSVS is, to the best of our knowledge and belief, correct and accurate, and resolution of the outlier issues listed on the previous page will satisfy the requirments for this item of equipment to be verified for seismic adequacy:
Approved by: Date:
0