ML18031A916

Requests Submittal of Reactor Vessel Matls Surveillance Program to Satisfy Objectives of 10CFR50,App H for Withdrawing Reactor Vessel Surveillance Capsules to Correct Measured Fluence/Calculated Fluence Ratio in 850723 Plan

ML18031A916
Person / Time
Site:	Browns Ferry
Issue date:	10/27/1986
From:	Clark R Office of Nuclear Reactor Regulation
To:	White S TENNESSEE VALLEY AUTHORITY
References
NUDOCS 8610300182
Download: ML18031A916 (6)

Text

October 27, 1986 Dockets Nos. 50-259/260/296 Mr. S.

A. White Manager of Nuclear Power Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801

Dear Mr. White:

Distribution r

LSpessard NRC 8

LPDRs RBernero EJordan BGrimes ACRS (10)

HThompson JPartlow RClark SRConnelly NGrace, RII OGC-Bethesda GZech, RII SNorris OIA MGrotenhuis

SPWeise, RII Plant File HDentbn SRichardson,IE

JTaylor, IE

BHayes, OI WECampbell BJYoungblood JHolonich CStahle TKenyon WLopg TAlexion FCantrell RWessman

p. Lt~<

R. Tfi~>sv'f RE:

REACTOR VESSEL MATERIALS SURVEILLANCE PROGRAM FOR BROWNS FERRY NUCLEAR POWER PLANT, UNITS 1, 2, AND 3 By letter to the Commission dated July 23, 1985, the Tennessee Valley Authority documented their plan for withdrawing reactor vessell surveillance capsules from the Browns Ferry Nuclear Plant, Units 1, 2, and 3.

The Technical Specifications for the units require that surveillance capsules be withdrawn from the reactor at one-fourth and three-fourth service life.

Based on the licensee's interpretation, one-fourth service life was equivalent to eight effective full-power years (8.0 EFPY), and, similarly, three-fourths service life was equivalent to twenty-four effective full-power years (24.0 EFPY), assuming 80Ã capacity factor for the forty year reactor design life.

Pursuant to paragraph II.B.3 of Appendix H of 10 CFR Part 50, the licensee requested Commission approval of the proposed surveillance withdrawal program.

The staff has reviewed the Browns Ferry FSAR and two supporting documents "Brown Ferry Core Region Materials Information (Units 1, 2, and 3)", BAW-1845, August 1984, and "Analysis of the Vessel Wall Neutron Dosimeter from Browns Ferry Unit 1 Pressure Vessel", Final Report SWRI Project 02-4884-001, August 1978.

The results of dosimetry measurement~

.indi~ate an average flux at the vessel wall for thhthree units of 1.1 x 10 n/cm The EOL f/5lence (32.0 EFPY) is 1.12 x 10 nvt (16$ uncertainty) instead of 3.8 x 10 nvt 40.0 EFPY) as calculated in NED0-10115, "Mechanical Property Surveillance of General Electric BWR Vessels", July 1969, and the FSAR.

Therefore, the measured fluence is 3.7 times larger than the calculated fluence.

Since the measured fluence is 3.7 times larger than the calculated fluence, your proposed interpretation of the Technical Specification does not achieve the objectives of Appendix H to 10 CFR Part 50.

Instead of the literal withdrawal schedule you proposed, we suggest that you develop an integrated surveillance program for all three Browns Ferry units that is more related to estimated fluence than to a set time (e.g.

24 EFPY), particularly since the 8bi0300182 861027 PDR ADOCK 050002S9 P

PDR

A II,,

~

L t

i

'l I

, f f

N 1"

u s,,

A II

present licenses expire in the next 21 to 22 years.

In accordance with paragraph II.B.3 of Appendix H, this program should be submitted for our approval.

Appropriate changes to the Technical Specifications to reflect your proposed program should also be provided.

Sincerely, cc w/enclosure:

See next page Orlgfna1 signed bg Richard J Clark Richard J. Clark, Project l1anager BWR Project Directorate ¹2 Division of BWR Licensing DB 'PD¹2 SN ns 10/AP/86 DBL:PD¹2 RClark:j 10/gz /86 DBL:PD¹2, Dijon+

2 MGrotenhuis DRuller 10@/86

'0+'1/86

rz

~

4'I II "2 ~

k

~

I, i

1

\\

l (

4(

(

Mr. S.

A. White Tennessee Valley Authority Browns Ferry Nuclear Plant Units 1, 2, and 3

CC:

General Counsel

'Tennessee Valley Authority 400 Commerce Avenue E llB 330 Knoxville, Tennessee 37902 W. C. Drotleff ATTN:

J.

A. Raulston Tennessee Valley Authority 400 West Summit Hill Dirve, M12 A12 Knoxville,'ennessee 37902 R. L. Gridley Tennessee Valley Authority 5N 1578 Lookout Place Chattanooga, Tennessee 37402-2801 M. J.

May Tennessee Valley Authority Browns Ferry Nuclear Plant Post Office Box 2000

Decatur, Alabama 35602

Chairman, Limestone County Commission Post Office Box 188

Athens, Alabama 35611 Ira L. Meyers, M.D.

State Health Officer State Department of Public Health State Office Building Montgomery, Alabama 36130 Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 Mr. Steven Roessler U. S. Nuclear Regulatory Commission Reactor Training Center Osborne Office Center, Suite 200 Chattanooga, Tennessee 37411 Resident Inspector U. S. Nuclear Regulatory Commission Route 2, Box 311

Athens, Alabama 35611

'a

~

~

V