ML19317D252
| ML19317D252 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/25/1978 |
| From: | Parker W DUKE POWER CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7911190632 | |
| Download: ML19317D252 (4) | |
Text
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REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS) h 270/287 DISTRIBUTION FOR INCOMING MATERIAL 5C REC: REID R ORG: PARKER W O DOCDATE: 08/25/78 NRC DUKE PWR DATE RCVD: 08/31/79 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED
SUBJECT:
LTR 1 ENCL 0 RESPONSE TO NRC QUESTIONS OF 03/01/73.
FORWARDING ADDL INFO IN SUPPORT OF APPLICANT"S 06/12/78 TECH SPEC PROPOSED CHANGE CONCERNING REVISIONS TO TENDON 2D28 OF UNIT 2 REACTOR ELDG.
PLANT NAME: OCONEE - UNIT 1 REVIEWER INI TI AL:
XJM OCONEE -- UNIT 2 DISTRIBUTER INITI AL: g OCONEE - UNIT O
- DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS **********+*******
NOTES:
1.
M.
CUNNINGHAM -- ALL AMENDMENTS TO FSAR AND CHANGES TO TECH SPECS GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LICENSE.
(DISTRIBUTION CODE AOO1)
FOR ACTION:
BR CHIEF ORG34 BC**LTR ONLY(7)
INTERNAL:
( REn A C*N TR ONLYT1I D NRC PDR**LTR ONLY(1) 1 & E**LTR ONLYt2>
OELD**LTR ONLY(1)
HANAUER**LTR ONLY(1)
CORE PERFORMANCE BR**LTR ONLY(
AD FOR SYS & PROJ**LTR ONLY(1)
ENGINEERING ER**LTR ONLY(1)
REACTOR SAFETY GR**LTR ONLY(1)
PLANT SYSTEMS BR**LTR ONLY(1)
EEB**LTR ONLY(1)
EFFLUENT TREAT SYS**LTR ONLY(1 J.
MCGOUGH**LTR ONLY(1)
EXTERNAL:
LPDR'S WALHALLA, SC**LTR ONLY(1)
TERA **LTR ONLY(1)
NSIC**LTR ONLY(1)
ACRS CAT B**LTR ONLY(16) h 1-l l
DISTRIBUTION:
LTR 40 ENCL 0 CONTROL NBR:
782430248 SIZE: IP+1P 7
co**o****xn************************
THE END N
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DUKE POWER CO>iPANY Powra Br:rtoxxo 422 SocTn Causcu SrazzT. Cruar.oTTE, N. C. as242 w n.uei o. e4a n ca, s a.
August 25, 1978 Vict Pers6ctwT 7t.ge=c N E:AeCA 704 S'E* ** PRODuCTicM 373-4083
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Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation
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U. S. Nuclear Regulatory Commission
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Washington, D. C.
20555 j
Attention:
Mr. R. Reid, Chief
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Operating Reactors Branch #4
Reference:
Oconee Nuclear Station Docket Nos. 50-269, -270, -287
Dear Sir:
My letter of June 12, 1978 submitted a proposed license amendment which contained several proposed administrative changes to the Oconee Nuclear Station Technical Specifications. One of these changes concerned tendon 2D28 of the Unit 2 Reactor Building.
At the time of the submittal, it was considered that the tendon would be required to be replaced. However, since that time, a review has been conducted which indicates that the structural integrity of the Unit 2 Reactor Building is not affected with the damaged tendon installed and with its tension relieved.
However, with tendon 2D28 installed, periodic determination of material deterioration would be possible. Therefore, it is our current intention to keep the damaged tendon installed, but not under tension. The full range of surveillance requirements of Specification 4.4.2 would not be feasible for this tendon. The determination of the extent of material deterioration would be the only surveillance feasible with this tendon.
Your letter of August 1, 1978 transmitted questions in response to our proposal of June 12, 1978.
Please find attached responses to those questions.
As requested 40 copies of this response are provided.
- n-.j Ve truly yours
. ' * ~W i s.
{[.gy y d 1 W Y
N Q. A,
.& Y William O. Parker, J O RLG:ses Attachments (40) 782430248
- e DUKE POWER COMPANY Response to Request for Additional Information Concerning Oconee Unit 2 Tendon 2D28 QUESTION 1 Indicate whether any damage has been done to the concrete, anchor hardware or the conduit (also trumpet) in the vicinity of/or adjacent to, the damaged tendon 2D28.
RESPONSE
No damage was done to the concrete, anchor hardware or any other component in the proximity of tendon 2D28.
QUESTION 2 Describe the procedure which will be used in installing the new tendon replacing the broken tendon 2D28 and especially to what level of prestress it will be tensioned. Justify this level, considering that the new tendon has to partici-pate in load sharing with the existing tendons, during a postulated LOCA.
RESPONSE
It is our current intent not to replace tendon 2D28. The nine installed surveillance tendons are used to test for symptoms of material deterioration or force reduction in the Reactor Building post-tensioning system.
Surveillance tendons are not required to maintain structural integrity of the building during a postulated accident.
The uabroken wire in tendon 2D28 can still be used to test for deterioration, however, it will not be available for force reduction measurements.
QUESTION 3 Since the total number of surveillance tendons is prescribed by the R.G. 1.35 and the Technical Specifications indicate what surveillance tendon will be substituted for the broken 2D28.
RESPONSE
As stated in the response to Question 2, it is our current intent not to replace tendon 2D28. The surveillance conducted on tendon 2D28 will be limited to determination of material deterioration. By not replacing this tendon, the records obtained in the previous five years of testing would remain valid.
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QUESTION 4 Provide the results of wire inspection and testing for one wire in the broken tendon 2D28, as prescribed in the Technical Specification.
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RESPONSE
Tendon wires from Unit 2 are currently being tested. A final l
report of the results of the tendon surveillance inspection of Unit 2 will be provided by December 1, 1978.
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