ML19340C754
| ML19340C754 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 11/26/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 8012170354 | |
| Download: ML19340C754 (1) | |
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NOV 2 61980 In Reply Refer To:
RII :.TPO N16 D 50-417 j Mississippi Power and Light Company ATTN:
N. L. Stampley Vice President of Production P. O. Box 1640 Jackson, MS 39205 Gentlemen:
This Information Notice is provided as an early notification of a possible significant matter. It is expected that recipients will review the it. formation for possible applicability to their facilities. No specific action or response is requested at this time. If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
1 Sincerely, 1
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.u g-i James P. O'Reilly 0 Director
Enclosures:
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IE Information Notice No. 80-29 Supplement No. 1 l
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UNITED STATES 8006190028 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT g' N,,) L gp i
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November 26, 1980 IE Information Notice No. 80-29 (Supplement No. 1): BROKEN STUDS ON SERRY TURBINE STEs INLET FLANGE Description of Circumstances:
In the original Information Notice the failed Terry Turbine steam inlet flange studs were identified as probably manufactured from ASTM-A193-Grade B7 steel.
Subsequently, the vendor has informed the FIF that the bolting material used at ANO-1 was AISI C-1117 steel.
Independent 14boratory analyses by the NRC and Arkansas Power and Light have verified that the bolting material was a re-sulphurized, re-phosphorized cold drawn carbon steel.
From the analysis performed, the failure was caused by high overload which resulted in a primarily brittle transgranular fracture (cleavage) in probably less than 10 cycles.
This is consistent with the operating experience (water slugging) and the inherect low toughness of the bolting material used.
Licensees are encouraged to review the materials selected for safety-related bolting applications considering especially those situations where impact loadings could occur.
The use of low toughness carbon steel (re-sulphurized free machining plain carbon steel) for bolting is discouraged by the NRC; particularly in situations where possible high loading conditions could be anticipated.
This Information Notice is provided as an early notification of a possibly significant matter that is still under review by the NRC staff.
It is expected that recipients will review the information for possible applicability to their facility.
No specific action or response is requested at this time.
If you have any questions regarding this matter, please contact the Director of the cppropriate NRC Regional Office.
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IN 80-20 Supplement No. I November 26, 1980 RECENTLY ISSUED IE INFORMATION NOTICES Information Date of Notice No.
Subject Issue Issued to 80-29 Broken Studs on Terry 11/26/80 All LWR facilities Supp. 1 Turbine Steam Inlet holding OL or CP Flange 80-42 Effect of Radiation on 11/24/80 All power reactor Hydraulic Snubber Fluid facilitics with OL or CP 80-41 Failure of Swing Check 11/10/80 All power reactor Valve in the Decay Heat facilities with an OL Removal System at Davis-or CP Besse Unit No. 1 80-40 Failure of Swing Check 11/10/80 All power facilities Valve in the Decay Heat with and OL or CP Removal System at Davis-Besse Unit No. 1 80-39 halfunctions of Solenoid 10/31/80 All light water reactor Valves Manufactured by facilitics holding Valcor Engineering Corporation power reactor OLs or cps 80-38 Cracking in Charging Pump 10/30/80 All PWR facilities Casing Cladding with an OL or CP 80-37 Containment C. ler Leaks 10/?4/80 All nuclear power and Reactor Cavity facilities holding F1 coding at Indian Point power reactor OLs Unit 2 or cps 80-36 Failure of Steam 10/10/80 All nuclear power Generator Support Bolting reactor facilities holding power reactor OLs or cps 80-35 Leaking and Dislodged 10/10/80 All categories G and Iodine-124 Implant Seeds G1 medical licensees 80-34 Boron Dilution of Reactor 9/26/80 All pressurized water Coolant During Steam reactor facilities Generator Decontamination holding power reactor OLs 80-33 Determination of Teletherapy 9/15/80 All teletherapy Timer Accuracy (G3) licensees 80-32 Clarification of Certain 8/12/80 All NRC and agreement Requirements for Exclu-state licensees sive-use Shipments of Radioactive Materials
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