ML18114A444
| ML18114A444 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley, Surry, Maine Yankee, FitzPatrick  |
| Issue date: | 04/13/1979 |
| From: | Jacobs S STONE & WEBSTER ENGINEERING CORP. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904180268 | |
| Download: ML18114A444 (3) | |
Text
',.
STONE & WEBSTER ENGINEERING CORPORATION 245 SUMMER STREET, BOSTON, MASSACHUSETTS ADDRESS AL.L. CORRESPONDENCE TO P.O. BOX 2325, BOSTON. MASS. 02107 NEW YORK BOSTON CHICAGO HOUSTON DENVER CHERRY HILL, N.J.
PORTLAND, OREGON April 13, 1979 Mr. Victor Stello, Jr., Director Division of Operating Reactors Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Stello:
DESIGN CONSTRUCTION REPORTS EXAMINATIONS CONSULTING ENGINEERING Attached is an update and status report on Stone &
Webster Engineering Corporation "Plan.for Verifi9ation of Dynamic Analysis Codes", dated April 6, 1979.
As previous-ly indicated the pilan addresses the verification requirements in Enclosure 3 to your April 2nd letters on the following dockets:
Addressee Unit G.T.Berry Power Authority of the State of New York James A Fitzpatrick Nuclear Plant C.N.Dunn Duquesne Light Company BeaverValley Power Station Unit 1 W.L.Profitt Virginia Electric & Power Company Surry Power Station, Unit 1 Surry Power Station, Unit 2 R.H.G~oce Yankee Atomic Electric Company Maine Yankee Atomic Power Station Docket No.
50~333 50-334 50-280 50-281 50-309 This submittal is, therefore, applicable to the above listed dockets.
Ve~y truly yours c-
.. -:::~-
S.B.Jacobs Chief Licensing Engineer I hereby acknowledge receipt of the attached material.
7 9 O 4 1 8 0 2G,8 Signature Title
STATUS REPORT ON STONE f, WEBSTER
- April 13, 1979 Plan for Verification of Dynamic Analysis Codes Requirement 1 -
Copies of the program listings for PSTRESS/
SHOCK 2, PSTRESS/SHOCK 3, PSTRESS/SHOCK 1, NUPIPE, were transmitted to Dr. Harold Denton, Director of the Office of Nuclear Reactor Regulation, on a proprietary basis on April 6, 1979.
Stone f. Webster's commitments with regard to requirement 1 were completed at that time.
Requirement 2 -
As indicated in the verification plan, initial solutions to the Hovgaard bend and coffee table benchmark problems were compared to the results obtained by the NRC staff and the frequencies and pipe stresses were virtually identical.
Solutions for these problems with additional earthquake excitations were received from Dr. Paul Bezler at Brookhaven National Laboratory (BNL) on April 11, 1979.
These problems are being analyzed with PSTRESS/SHOCK 3 and NUPIPE and will be completed by ApriL,17, 1979.
The results of the initial comparison were not transmitted on April 10, as originally intended, but will be forwarded with the results of the comparison of the additional Brookhaven runs.
Comparison of the reactor coolant loop solutions was com-pleted but did not agree exactly with the solutions received from BNL, because NUPIPE combines the earthquake response using the square root sum of the squares method (SRSS).
Furthermore, additional information concerning mass distri-bution was received by S&W on April 12, 1979.
Comparison of the results will require that BNL rerun the problem using the SRSS method before a valid comparison can be drawn.
Note that difficulty in modeling this problem on PSTRESS/
SHOCK 3 is still being encountered and modifications to the problem will be forwarded to BNL for a comparison as soon as possible.
Requirement 3 - Three Maine Yankee problems run on SHOCK 1 were selected at random and rerun on NUPIPE.
Comparison of the solutions was completed on April 11, and reviewed with Yankee Atomic on April 12.
The comparison of the results was good and they will be sent to the NRC upon completion of the Surry comparison runs.
The Surry effort has been delayed beyond April 13; however, three Surry problems are expected to be available by April 20.
v-
- 2.
Requirement 4 -
The confirmatory problems identifLed in requirement 4 of the verification plan have been completed with the exception of Maine Yankee problem 803, coded on NUPIPE.
Problem 803 will be transmitted on April 16, 1979.
All other problems identified in requirement 4 have been previously transmitted.