ML20237G827

Forwards Safety Evaluation Re Ultrasonic Insp of RCS (Loop B) hot-leg Elbow.Ultrasonic Exam Performed Acceptable W/Exception of Ultrasonic Beam Spread Correction Procedures Used to Estimate Indication Size

ML20237G827
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	08/24/1987
From:	Chan T Office of Nuclear Reactor Regulation
To:	Cockfield D PORTLAND GENERAL ELECTRIC CO.
Shared Package
ML20237G830	List: ML20237G827 ML20237G842
References
TAC-65315, NUDOCS 8709020427
Download: ML20237G827 (2)

Text

_ _ - _ _ _ _ _ _ _

AUG 2 41987 Docket No. 50-344 DISTRIBUTION A' DocketJ11e# ^ ACRS(10)

Mr. David W. Cockfield ~ NRC F Local PDRs Vice President, Nuclear PD5 Plant EJordan Portland General Electric Company G. Holahan JPartlow 121 S.W. Salmon Street J. lee Portland, Oregon 97204 T. Chan OGC-Bethesda

SUBJECT:

ULTRASONIC INSPECTION OF THE REACTOR COOLANT SYSTEM H0T-LEG l ELB0W - TROJAN NUCLEAR PLANT (TAC N0. 65315)

By letter dated July 24, 1987, Portland General Electric Company (PGE) submitted the ultrasonic examination results of the reactor coolant system (Loop B) hot-leg elbow for the Trojan Nuclear Plant as required by the staff 1 in the Safety Evaluation transmitted by letter dated June 16, 1986 (S. Varga '

to B. D. Withers). The areas examined were the sides of the elbow, as i required by the staff.

We have reviewed your submittal and in general, find the ultrasonic examination performed to be acceptable with the exception of the ultrasonic " beam spread correction" procedures used to estimate the indication size. The staff found the procedures to be inadequate and subject to interpretation. However, the staff considers the detected ultrasonic indications to be of a small size.

Based on the information provided, we conclude that continued operation of Trojan with the detected indications is permissible until the next refueling outage, .t which time PGE has committed to reexamine the elbow. Our conclu-sions anu recommendations for reexamination of the elbow are contained in the enclosed Safety Evaluation.

Sincerely.

Terence L. Chan, Project Manager Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects cc: See next page OFC :LA:PD/DRSP :PM/PD/DRSP :D/P glSP  :  :  :  :

.....:............:....... 4..:... (......:............:............:............:...........

if0N

. . . . . : . . . . . . . .:TCHAN:p NAME :JLEE

G: K  :  :

. . . . . f.,d'-  :

DATE :08/ /87 :08/zf87 :08/8/87  :  :  :  :

V 0FFICIAL RECORD COPY 8709020427 870824 PDR ADDCK 05000344

& PDR

.-' . .d-Mr.iDavidW.'Cockfield Portland General Electric Company Trojan Nuclear Plant CC: , ..

-Senior Resident Inspector U.S. Nuclear Regulatory Commission

Trojan Nuclear' Plant Post Office Box 0 Rainier, Oregon 97048' Michael J. Sykes, Chairman Board of County Commissioners Columbia County.

St. Helens,. Oregon 97501 Mr. David Kish

~ Oregon Department of Energy 1

Labor and Industries Building Room 111 Salem, Oregon 97310 E Regional Administrator, Region V

.U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210

- Walnut Creek,! California 94596 l-e L. u____._ _ _ _ _ _ _ _ _ _ . _ . _