ML20077S437
| ML20077S437 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Crane |
| Issue date: | 03/12/1982 |
| From: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| Shared Package | |
| ML20077S281 | List: |
| References | |
| FOIA-83-349 IEIN-82-06, IEIN-82-6, NUDOCS 8309220085 | |
| Download: ML20077S437 (1) | |
Text
- ['
NUCLEAR REGULATORY COMMISSION
- g. '
~~
e
?,
ne:l%N I
(**
.itb j(i Su rAnn AvaNu2 h
g KIN B CF PT.USII A. PENN3YL.V ANI A 19418 MAR 121982 Docket No. 50-289 GPU Nuclear Corporation ATTN:
Mr. H. D. Hukill Vice President and Director of TMI-1 P. O. Box 480 Middletown, Pennsylvania 17057 Gentlemen:
The enclosed Information Notice No. 82-06, " Failure of Steam Generator Primary Side Manway Closure Studs," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, yl We=-
Ronald C. Haynes O Regional Administrator
Enclosure:
IE Information Notice No. 82-06 with 1 Attachment CONTACT:
L. E. Tripp (215) 337-5282 cc w/ enc 1:
R. J. Toole, Operations and Maintenance Director, TMI-1 C. W. Smyth, Supervisor, TMI-1 Licensing E. G. Wallace, Manager, PWR Licensing J. B. Liberman, Esquire G. F. Trowbridge, Esquire L. Barrett, Deputy Program Director, TMI Program Office D. Swanson, OELD:HQ NRC Resident Inspector Commonwealth of Pennsylvania
. ' - Ms. Mary V. Southard, Co-Chairman, Citizens for a Safe Environment e309226085 830728 M-28f PDR FOIA PETCHEe3-349 PDR
SSINS No.:
6835 Accession No.
8202040130 IN 82-06 UNITED. STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 March 12, 1982 '
IE INFORMATION NOTICE NO. 82-06:
FAILURE OF STEAM GENERATOR PRIMARY SIDE MANWAY CLOSURE STUDS Description of Circumstances:
~ ~ ~..
The Nuclear Regulatory Commissios (NRC) was notified by Maine Yankee Atomic Power Company and by Combustion Engineering (CE) that during routine disas-sembly of a ste'am generator primary side manway at Maine Yankee, 6 of the 20 manway closure studs failed.and anothgr 5 were found by ultrasonic testing to be cracked.
These are 1 x 10 inch studs of SA 540 grade B 24 alloy steel.
The studs had been exposed to boric acid from a small primary coolant leak and.to Furmanite sealing compound (primary grade) applied in an attempt to seal this leak.
The studs exhibited evidence of surface corrosion attack possibly as a result of an interaction associated with stud preload, lubricant, Furmanite and primary coolant leakage environment.
A metallurgical analysis to determine the failure mechanism is currently underway at CE.
The entire set of studs on the affected steam generater (SG #2) have been replaced and an ultrasonic examination of all primary manway studs on steam generator.
units 2 and 3 is being performed.
Further corrective actions are pending stud failure analysis and its applicability to other primary boundary closures.
In the last few years there have been a significant number of incidents of failed or severly degraded bolts and studs.
Examples of the latter; primary coolant pump stud-bolts (Calvert Cliffs and Ft Calhoun) and steam generator primary manway closures studs (Oconee and ANO-1).
The failures described were attributed to stress corrosion cracking and corrosion wastage of high strength studs that are difficult to detect.
The NRC has contacted the CE Regulatory Response Group and requested a review of the problem.
This IE information notice is provided as an early notification of a potentially significant matter that is still under review by the NRC staff.
If NRC evalua-tion so indicates, further licensee action may be requested.
In the interim, we expect that licensees will review this information for applicability to their facilities.
No written response to this information notice is requested.
If you need addi-tional information, please contact the Regional Administrator of the appropriate NRC Regional Office.
Attachment:
~
Recentl'y-issued IE Information Notices W I
vv - -
64M_L4n.ihAs IN 82-06 March 12, 1982 RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued to Notice No.
Issued 82-05 Increasing Frequency 03/10/82 All power reactor of Drug Related facilities holding Incidents an OL or CP 82-04 Potential Deficiency of 03/10/82 All power reactor '
Certain AGASTAT E-7000 facilities holding Series Time-Delay Relays an OL or CP 82-03 Environmental Tests of 03/04/82 All power reactor Electrical Terminal facilities holding Blocks an OL or CP 82-01 Auxiliary Feedwater Pump 02/26/82 All power reactor Rev. 1 Lockout Resulting from facilities holding Westinghoue W-2 Switch-an OL or CP Circuitry Modification 80-32 Rev. 1 Clarification of Certain 02/12/82 All facility, Requirements for Exclu-materials and sive Use Shipments of Part 50 licensees Radioactive Materials 81-37 Rev. 1 Unnecessary Radiation 02/9/82 Selected Material.
Exposures to the Licensees Public and Washers
~
During Events Involving Thickness and Level Measuring Devices 82-02 Westinghouse NBFD 1/27/82 All holders of a Relay Failures in power reactor-Reactor Protection OL or CP Systems at Certain Nuclear Power Plants 82-01 Auxiliary Feedwater 01/26/82 All holders of a Pump Lockout Resulting power reactor from Westinghouse W-2 OL or CP Switch Circuit Modi-fication s
e e-t c w vvh-w,
,w--*w
~
y-3 w-
--t g-ft-t'+
9=-wv
+ -
- r C v-v r*"-v s w--"-
- -^ - -