ML18038B856
| ML18038B856 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 04/07/1997 |
| From: | Abney T TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9704160195 | |
| Download: ML18038B856 (8) | |
Text
CATEGORY 1 REGULAT'NEORMATZON DZSTRZBUTZONOZSTEM (RZDS)
SUBJECT:
Responds to staff understanding of util commitments re development of insp methods
& repair criteria for P4D core spray sys piping weld.
DISTRIBUTION CODE:
D030D COPIES RECEIVED:LTR ENCL SIZE:
TITLE: TVA Facilities Routine Correspondence NOTES:
ACCESSION NBR:9704160195 DOC.DATE: 97/04/07 NOTARIZED:
NO FACIL:50-296 Browns Ferry Nuclear Power Station, Unit.3, Tennessee COUTH.NAME AUTHOR. AFFILIATION ABNEY,T.E.
Tennessee Valley Authority RECIP.NAME RECIPIENT 'AFFILIATION Document Control Branch (Document Control Desk)
DOCKET I 05000296 A
T RECIPIENT ID CODE/NAME PD2-3 WILLIAMS,J.
INTERNAL: ACRS OGC/HDS3 EXTERNAL: NOAC COPIES LTTR ENCL RECIPIENT ID CODE/NAME PD2-3-PD FILE CENTER 01 RE~S DE SSEB/SES NRC PDR COPIES LTTR ENCL D
'U E
NOTE TO ALL MRIDSM RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)
ON EXTENSION 415-2083
.TOTAL NUMBER OF COPIES REQUIRED:
LTTR 9
ENCL
Tennessee Valley Authority, Post Office Box 2000,'DecaturAlabama 35609-2000 April 7, 1997 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of Tennessee Valley Authority Docket No. 50-296 BROWNS FERRY NUCLEAR PLANT (BFN)
<< UNIT 3 - REACTOR PRESSURE VESSEL INTERNALS, AUGMENTED WELD INSPECTION' EVALUATION OF INDICATIONS AT THE CORE SPRAY SYSTEM PIPING COLLAR-TO-SHROUD WELD DAY RESPONSE TO NRC'S ASSESSMENT (TAC NO. M98059)
This letter responds to the Staff's understanding of TVA's commitments regarding the development of inspection methods and repair criteria for the P4D Core Spray System piping weld.
On March 7,
- 1997, TVA submitted a description of flaws identified during an inspection of core spray piping within.
the reactor vessel for BFN Unit 3.
TVA provided an evaluation of the effect of the identified flaws on the structural integrity of,the core spray piping.
In addition, TVA provided supplemental information, by letters dated March 9, 1997 and March 10, 1997.
In the March 10, 1997 letter, TVA committed to work with the Boiling Water Reactor Vessel and Internals Project (BWRVIP)
Qr,.CIS Committee to develop inspection methods and repair criteria for the P4D weld.
TVA also committed to reinspect or repair the Core Spray System piping and to provide its plans to the staff 120 days prior to the start of the BFN Unit 3 Cycle 8
9704160i'Pt5
..'R70407 PDR ADQCKL05000296 8
PDR lllli1II]gllgllll]llilllllllilllllllllll
'\\
E
U.S. Nuclear.Regulatory Commission Page 2
April 7, 1997 refueling outage.
As part of this commitment, TVA may pursue several avenues to demonstrate that the observed indications at the P4D weld originate at the outside diameter (OD).
These include but are not limited to:
Working with the BWRVIP Committee to develop
-an Ultrasonic Testing (UT) inspection methodology and criteria for repair of the subject weld, Comparison of the observed indications to indications known to be caused by cold working, which results in OD originated cracking,
~
Comparison of the observed indications to indications known to be originated from the inside diameter of
- piping,
~
Comparison of the observed indications to indications observed and evaluated at other facilities,
~
Evaluating the feasibility of grinding down the indication to demonstrate i't was OD originated, and/or
~
Evaluation of Core Spray System operability considering the absence of the P4D weld.
As noted in NRC's March 11, 1997 letter to TVA, responsibility for assurance of the integrity of the core spray piping at the time of reactor restart lies with TVA.
Therefore, absent of a subsequently defined regulatory framework, TVA intends to continue to submit the results of future Core Spray System piping inspections and evaluations to the NRC for the Staff's information as soon as practical after completion of the activities.
II I
'U..S. Nuclear Regulatory Commission Apl.7 7;, 1997 There,-are no new commitments in this letter.
If you have any questions, please call me at (205) 729-2636.
Sincerely,
.;E.. Abney Manager of L'sing and Indus ry Affairs CC Mr. Mark S.
er, Branch Chief U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta,,
George.'a.
30323
'NRC Resident Inspector Browns 'Ferry Nuclear Plant 10833 Shaw Road
- Athens, Alabama 35611 Mr. J.
F. Williams,, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852
Ik ll