ML19269D442
| ML19269D442 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 04/24/1979 |
| From: | Wachter L NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 7906040062 | |
| Download: ML19269D442 (3) | |
Text
ftG NSD I
NORTHERN 5TATES P O VV E R COMPANY M I N N E A PO LI S. M IN N E S OTA 55401 April 24, 1979 Mr James G Keppler Director - Region III Office of Inspection and Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Dear Mr Keppler:
PRAIRIE ISLAND NUCLEAR GENERATING PLANT D>cket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Response to IE Bulletin No. 79-07 dated April 14, 1979 IE Bulletin 79-07 requested that we review the computer codes used for the seismic analysis of safety related piping systems and supply certain information concerning these codes. Information was to be supplied for codes used in the original plant design and all subsequent piping system additions and modifications.
Our review in(icates that computer codes have been used by the following organizations for seismic analysis of Prairie Island safety related piping:
Organization Piping Systen Westinghouse Electric Reactor Coolant System Corporation Stone & Webster Cooling System improvements (now in progress)
Fluor Power Services All other safety related Incorporated (FPSI) piping The atached table provides the following information for the computer codes used by these organizations:
2258 193 a.
Code name and source b.
Notation (if algebraic summation used) c.
Method of code verification
'R 2 61979 790604006N
NORTHERN STATES POWER COMPANY Mr James G Keppler Page 2 April 24, 1979 As noted in the table, ADLEPIPE was used in the analysis of one safety injection line in Unit No. 1 by Nuclear Services Corporation under contract to FPSI.
Since available documentation could not rule out the possibility that algebraic summation was used in this analysis, it was repeated using PIPESTRSS and the design was found to be satisfactory.
None of the other codes which may have been used in the seismic evaluation of Prairie Island safety related piping systems contain the deficiency described in IE Bulletin 79-07 or other known deficiencies.
As noted in the table, information is not yet available concerning some aspects of the verification of FPSI and Stone and Webster seismic analysis codes. This information will be provided to you when it becomes available.
Please contact us if you require additional information concerning our response.
Very truly yours, Xgf&
L J Wachter Vice President - Power Production and System Operation cc:
Mr G Charnoff NRC Office of Inspection and Enforcement Washington, DC Attachment 2258 194
43N
?2U gg.
Ccmputer Codes Used for Seismic Analysis of Safety Related SOe 5
Piping Systems at the Prairie Island Nuclear Generating Plant p
e e
Organization Code Name and Source Algebraic Summation Method of Code Verification U
Used?
Westinghouse Electric Corp.
WESTDYN - Westinghouse No Documentation of code verification was provided to the NRC in topical report, WCAP-8252, Revision 1.
Stone and Webster NUPIPE - Stone & Webster No To be supplied Fluor Power Services, Inc.
PIPESTRSS - Fluor Power No ADLPIPE (note 1)
Se rvices ADLPIPE -
subcontracted to No (note 2)
Nuclear Services Corp.
N NW CO
@W Notes:
1.
We believe the algebraic summation option was not used in the ADLPIPE verification calculations.
Documentation of this is still being pursued.
- 2. ALDPIPE was originally used in the analysis of one safety injection line in Unit No.
1.
A review of available documentation indicated that we could not rule out the possibility that algebraic summation was used.
This analysis was repeated using PIPESTRSS. The new analysis confirmed the adequacy of the original design.