ML18139A899
| ML18139A899 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 11/26/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Ferguson J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8012170387 | |
| Download: ML18139A899 (3) | |
Text
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In Reply Refer To:
RII:JPO e
UNITED STATES NUCLEAR REGULATORY COMMISSION REGION II 101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 NOV 2 6 1980 Virginia Electric and Power Company ATTN: J. H. Ferguson Executive Vice President-Power P. 0. Box 26666 Richmond, VA 23261 Gentlemen:
e This Information Notice is provided as an early notification of a possible significant matter. It is expected that recipients will review the information 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 Bulle.tin 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.
Sincerely,
~~
James P. O'Reilly Director
Enclosures:
- 1.
IE Information Notice No. 80-29 Supplement No. 1
- 2.
List of Recently issued IE Information Notices cc w/encl:
W.R. Cartwright, Station Manager P. G. Perry, Senior Resident Engineer J. L. Wilson, -Manager
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 Nov~mber 26, 1980 SSINS No.:
6835 Accession No.:
8006190028 IE Information Notice No. 80-29* (Supplement No. 1):
BROKEN STUDS ON TERRY TURBINE STEAM INLET FLANGE Description of Circwnstances:
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 NRC that the bolting material used at ANO-I was AISI C-1117 steel.
Independent laboratory 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 pr,obably less than 10 cycles.
This is consistent with the operating experience (water slugging) ~nd the inherent 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 appropriate NRC Regional Office *
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Information Notice No. 80-29 Supp. 1 80-42 80-41 80-40 80-39 80-38 80-37 80-36 80-35 80-34 80-33 80-32 RECENTLY ISSUED IE INFORMATION NOTICES Subject Broken Studs on Terry Turbine Steam Inlet
.Flange Date of Issue 11/26/80 Effect of Radiation on 11/24/80 Hydraulic Snubber Fluid Failure of Swing Check 11/10/80 Valve in the Decay Heat Removal System at Davis-Besse Unit No. 1 Failure of Swing Check 11/10/80 Valve.in the Decay Heat Removal System at Davis-Besse Unit No. 1 Malfunctions of soienoid 10/31/80 Valves Manufactured by Valcor Engineering Corporation Cracking in Charging Pump 10/30/80 Casing Cladding Containment Cooler Leaks 10/24/80 and Rea~tor Cavity Flooding at Indian Point Unit 2 Failure of Steam 10/10/80 Generator Support Bolting Leaking and Dislodged 10/10/80 Iodine-124 Implant Seeds Boron Dilution of Reactor 9/26/80 Coolant During Steam Generator Decontamination
' Determination of Teletherapy 9/15/80 Timer Accuracy Clarification of Certain 8/12/80 Requirements for Exclu-sive-use Shipments of Radioactive Materials
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e IN 80-20 Supplement No. 1 November 26, 1980 Issued to All LWR facilities holding OL or CP All power reactor facilities with OL or CP All power reactor facilities with an OL or CP All power facilities with.and OL or CP All light water reactor facilities holding power reactor OLs or CPs All PWR facilities with an OL or CP All nuclear power facilities holding
.power reactor OLs or CPs All nuclear power reactor facilities holding power reactor OLs or CPs All categories G and GI medical licensees All pressurized water reactor facilities holding power reactor OLs All teletherapy (G3) licensees
.All NRC and agreement state licensees
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