ML20147F665

Ack Receipt of 780825 Response to NRC 780801 Request for Addl Info Re Substitute Surveillance Tendon.Requests Addl Info Re Solution to Stress Corrosion Surveillance & lift-off Test Problem within 30 Days

ML20147F665
Person / Time
Site:	Oconee
Issue date:	10/02/1978
From:	Reid R Office of Nuclear Reactor Regulation
To:	Parker W DUKE POWER CO.
References
NUDOCS 7810200102
Download: ML20147F665 (1)

Text

--

-. - - -. _ -...... _.j M

UNIT ED GTATES

["x NUCLEAR REGULATORY COMMISSION

c WASHINGTON, D. C. 20556 a

a

~t

/

October 2,1978

• sas Docket No.:

50-270 o

l Mr. William O. Parker, Jr.

Vice President - Steam Production Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242

Dear Mr. Parker:

We have reviewed your responses of August 25, 1978 to our requests for additional information of August 1,1978, based on your request to use a substitute surveillance tendon in the Oconee Nuclear Station Unit No. 2 containment structure as submitted by Duke Power Company on June 12, 1978.

We find that we need a more definitive respo.1se to our Question 3 so that we can continue our review of this proposal.

You stated in response to Question 3 that you do not intend to replace tendon 2028.

'You did not address the concern expressed by Question 3 i

regarding the total number of tendons needed, as prescribed by Regu-latory Guide 1.35 not only to monitor for periodic material degradation but also to check the prestressing force in the tendon, by lift-off tests.

Tendon 2D28, if left in place but not under tension, will neither serve to check for potential material degradation, if due to stress corrosiu nor would it be available for lift-off tests.

If after review of our above concerns you decide to let 2D28 remain in place, but un-loaded, we suggest that you select and identify a sufficient number of tendons, under tensiun, for lift-off testing, using the criteria of Regulatory Guide 1.35.

Kindly inform us of your proposed solution to our concerns of stress corrosion surveillance and lift-off testing.

It is requested that you provide this information to enable us to com-plete our review.

Xindly submit three signed originals and 37 additional copies within 30 days of receipt of this letter.

Sincerely,

)

' g/f c -

l Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors cc:

See next page J 7/ 0 2.0 o / c 2.-

k

4 4.

Duke Power Company cc:

Mr. William L. Porter Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 J. Michael McGarry, III, Esquire DeBevoise & Liberman 700 Shoreham Building 806-15th Street, NW.,

Washington, D.C.

20005 Oconee Public Library 201 South Spring Street Walhalla, South Carolina 29691 G

9 s

e