ML19312C579
| ML19312C579 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/14/1978 |
| From: | Parker W DUKE POWER CO. |
| To: | Case E, Reid R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19312C580 | List: |
| References | |
| NUDOCS 7912180885 | |
| Download: ML19312C579 (2) | |
Text
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REGULATORY INFORMATION DISTRIEUTION SYSTEM (RID ^'
DISTRIBUTION FOR INCOMING MATERIAL 50-2t.
270/297 REC: CASE E G ORG: REID F:
DOCD ATE: 07/14/7s NRC DUKE PUR DATE RCVD: 07/19/76 DOCTYPE: LETTEF NOT ARI ZED: NO COPIES RECEIVED
SUBJECT:
LTR 1 ENCL 1 PROPOSED MODIFI..iTION OF THE HIGH PRESSURE INJECTION SYSTEM AT SUBJECT FACZLITY WHICH IS INTENDED TO EFFECTIVELY MITIGATE SMALL BREAK LOCA PLANT NAME: OCONEE - UNIT 1 REVIEWER INITIAL:
XRS OCONEE - UNIT 2 DISTRIBUTER INITIAL:
OCONEE - UNIT 3
" * ****** * * * *
- 4 * * *
- DISTRIDUTION OF THIS MATERIAL IS AS FOLLOWS ******************
NOTES:
1.
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CUNNINGHAM - ALL AMENDt1ENTS TO FSAR AND CHANGES TO TECH SPECS GENERAL DISTRIBU1 ION FOR AFTER ISSUANCE OF OPERATING LICENSE.
(DISTRIBUTION CODE AOO1)
FOR ACTION:
ER CHIEF ORBtt4 DCn*W/7 ENCL INTERNAL:
REG FILS** UENCL NRC PDR**W/ ENCL
' 2 ENCL OELD**LTR ONLY HANAUER**W/ ENCL CORE PERFORMANCE ER**W/ ENCL AD FOR SYS t< PROJe*W/ ENCL ENGINEERING BR**W/ ENCL REACTOR SAFETY BR**W/ ENCL PLANT SYSTEMS BR**W/ ENCL EEB4-*W/ ENCL EFFLUENT TREAT SYS**W/ ENCL J.
MCGOUGH**W/ ENCL EXTERNAL:
LPDR'S WALL!ALLA, SC**W/ ENCL TERA **W/ ENCL, NSIC**W/ ENCL ACRS CAT B**W/16 ENCL
/
1 DISTRIBUTION:
LTR 40 ENCL 39 CONTROL NBR:
782000091 SIZE: 1P+4P a+++++o++++++n+++++++ns+++ss+"*ex++
THE END
+++++++++++s4+++++
- +++++++b++++*
4912180O M )
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July 14, 1978 v.Or AntSictNT T(.,[pmCN E; AR [& 7O4 5' taw **oou vrom 373-4353 Mr. Edson G. Case, Acting birector Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Mr. R. Reid, Chief Operating Reactors Branch #4
Reference:
Oconee Nuclear Station Docket Nos. 50-269, -270, -287
Dear Mr. Case:
My letters of April 14, 1978 and April 21, 1978 addressed the probl2m with the previous ECCS performance analysis of small breaks of Oconee reactors and advised you of interim corrective actions implemented to assure acceptable ECCS performance during small break LOCA's, including those at the pump discharge.
Subsequently, on May 15, 1978, an analysis of the ECCS cooling performance calculated in accordance with the B&W Evaluation Model for operation of Oconee units with operating procedures described in my letter of April 21, 1978, was submitted. The purpose of this letter is to advise you of our proposed modification of the high pressure injection (HPI) System of Oconee Units 1, 2 and 3.
The proposed modification is intended to effectively mitigate small break LOCA's with minimum operator action.
The proposed modification is described in the attachment to this letter.
In order that we may initiate the engineering evaluation, final design and procurement of material and equipment and schedule the field installation of the modification, we request that the NRC review of this proposed modification be completed as soon as possible.
It is expected that this modification can be implemented for each unit during the applicable refueling outage that occurs after six months following the NRC approval of the modification.
7 truly yours, Ve 7
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William O. Parker, Jrbs PMA:scs Attachment
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