Computer Code Defect in Stress Analysis of Piping Elbow| ML031180207 |
| Person / Time |
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| Site: |
05000000 |
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| Issue date: |
12/31/1979 |
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| From: |
NRC/OI |
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| To: |
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| References |
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| IN-79-036, NUDOCS 7910250519 |
| Download: ML031180207 (2) |
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Category:NRC Information Notice
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[Table view] |
UNITED STATES SSINS No.: 6870
NUCLEAR REGULATORY COMMISSION Accession No:
OFFICE OF INSPECTION AND ENFORCEMENT 7910250519 WASHINGTON, D.C. 20555 December 31, 1979 IE Information Notice No. 79-36 COMPUTER CODE DEFECT IN STRESS ANALYSIS OF PIPING ELBOW
Description of Circumstances
The NRC was informed on December 17, 1979 that a computer code, NUPIPE, used
in the stress analysis of pipinq systems contained a defect which could result
in incorrect stress values at one end of pipinq elbows. This defect was iden- tified from discussions with a user of NUPIPE and the NUPIPE code developers.
The stress calculation error can occur when a flexible joint is modeled atdefect the
end of an elbow (ELBOW-ELASTOJT connection in NUPIPE terminology). This
in the N1IPIPE code is in the transformation of the loads in the ELASTOJT coordin- ate axis to the piping ELBOW coordinate axis. The incorrect coordinate axis
loads
transformation may incorrectly interchange the torsion and bending moment
on the pipinq elbow. This can result in the incorrect assignment of the stress
intensification factor for the individual moments. The correct stress may be
hiaher or lower than calculated by NUPIPE, depending on the loading condition.
Four conditions must exist for the possibility of the calculation of an incorrect
stress in the NUPIPE code:
1. an USAS B31.1.0 - 1967 Code analysis is being done, and
2. an ELBOW-ELASTOJT connection exists, and
3. an absolute sum of two load cases is beinq calculated, and
local
4. the ELBOW torsional moment axis does not align with the ELASTOJT
x-axis.
Webster, Possible users of the NUPIPE code include the code developer, Stone and currently
using the Cybernet system. The NRC is
EG&G (Idaho Falls), and those
reviewing the extent of usage of the NUPIPE code and the generic implications
occur in
for other facilities. There is a potential for a similar defect to
other piping analysis computer codes.
siqnif- This Information Notice is provided as early notification of a possible for
icant matter. It is expected that recipients will review the information
in
possible applicability to their facilities. No specific action is requested
further
response to this Information Notice. If NRC evaluations so indicate, licensee actions may be requested or required. If you have any questions
NRC
regarding this matter, please contact the Director of the appropriate
Reaional Office.
No written response to this IE Information Notice is required.
-7 IE Information Notice No. 79-36 Enclosure
December 31, 1979
RECENTLY ISSUED
IE INFORMATION NOTICES
Information Subject Date Issued To
Notice No. Issued
79-35 Control of Maintenance 12/31/79 All power reactor facilities
and Essential Equipment with an OL or CP
79-34 Inadequate Design of 12/27/79 All holders of power reactor
Safety-Related Heat OLs and CPs
Exchangers
79-33 Improper Closure of 12/21/79 All power reactor facilities
Primary Containment holding OLs and CPs
Access Hatches
79-32 Separation of Electrical 12/21/79 All power reactor facilities
Cables for HPCI and ADS holding OLs and CPs
79-31 Use of Incorrect Amplified 12/13/79 All holders of power reactor
Response Spectra (ARS) OLs and CPs
79-30 Reportinq of Defects and 12/6/79 All power reactor facilities
Noncompliance, 10 CFR Part 21. holding OLs and CPs and
vendors inspected by LCVIP
79-29 Loss of NonSafety-Related 11/16/79 All power reactor facilities
Reactor Coolant System holding OLs or CPs
Instrumentation During
Operation
79-28 Overloading of Structural 11/16/79 All power reactor facilities
Elements Due to Pipe Support with an OL or CP
Loads
79-27 Steam Generator Tube . 11/16/79 All power reactor facilities
Ruptures At Two PWR holding OLs and CPs
Facilities79-12A Attempted Damaqe To New 11/9/79 All Fuel Facilities, Fuel Assemblies research reactors, and
power reactors with an
OL or CP
79-26 Breach of Containment 11/5/79 All power reactor facilities
Inteqrity holdinq OLs and CPs
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- Information Notice 1979-22, Qualification of Control Systems (14 September 1979)
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- Information Notice 1979-26, Breach of Containment Integrity (5 November 1979)
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- Information Notice 1979-34, Inadequate Design of Safety-Related Heat Exchangers (27 December 1979)
- Information Notice 1979-35, Control of Maintenance & Essential Equipment (31 December 1979)
- Information Notice 1979-36, Computer Code Defect in Stress Analysis of Piping Elbow (31 December 1979)
- Information Notice 1979-37, Cracking in Low Pressure Turbine Discs (28 December 1979, Topic: Turbine Missile)
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