ML17254A307
| ML17254A307 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/04/1985 |
| From: | Kober R ROCHESTER GAS & ELECTRIC CORP. |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8504090220 | |
| Download: ML17254A307 (4) | |
Text
REGULATORY
]FORMATION DISTRIBUTION SY M (RIDS)
ACCESSION NBR:8504090220 DOC.DATE: 85/04/OO NOTARIZED> No DOCKET O
FACIL:50-244 Robert Emmet Ginna Nuclear Planti Unit ii Rochester G
05000244 AUTH INANE AUTHOR AFFILIATION KOBER,R ~ N ~
Rochester Gas 8 Electric Corp.
RECIP ~ NAME RECIPIENT AFFILIATION ZHOLINSKIiJ ~ A ~
Operating Reactors Branch 5
SUBJECT:
Informs that mods being completed for upgrading in"core thermocouples to meet emergency procedure requirementsPper util 831129 commitment. Info re design of mod 8
number of operable thermocouples required by procedures
- provided, DISTRIBUTION CODE:
AOOED COPIES RECEIYED:LTR L ENCL SIZE:
TITLE:
OR Submi ttal: Inadequate Cor e Cooling (Item II~ F,2)
GL 82 28 NOTES'RR/DL/SEP icy, OL: 09/19/69 0500020ll RECIPIENT ID CODE/NAME NRR ORB5 BC MILLER C INTERNAL: ACRS 17 NRR SHEAEJ 01 NRR/DHFS/PSRB16 NRR/OL/ORBS NRR/DSI'/CPB 10 NRR/OS I/RSB 13.
RGN1 07 COPIES LTTR ENCL
'0 1
1 1
1 3
1 1
REC IP IENT ID CODE/NAME NRR ORBS LA ADM/LFMB NRR/DHFS/HFEB15 NRR/DL/DRAB 08 NRR/DSI DIR 09 CSB 14 0P
, COPIES I.TTR ENCL 1
EXTERNALS LPDR NSIC NOTES:
03.
06 1
1 1
1 1
1 NRC PDR TOTAL NUMBER OF COPIES REQUIRED:
~ ~ j
<<2
~ SS2I'Sl/I AHD El/ll/+II/
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/////I///II i ////Inrun ROCHESTER GAS AND 14C44 4444 4444 ~ 4 I
STA'lC ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, N.Y. 14649-0001 ROGER W. KOBER WCC RRCStDCNT CLCCTRIC C4 STCAM PRODVCTlON TCCCRNONC AREA CODC TIC 546-2700 April 4I 1985 Director of Nuclear Reactor Regulation Attention:
Mr. John A. Zwolinskii Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington>
D.C.
20555
Subject:
Inadequate Core Cooling Instrumentation R.
E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Zwolinski:
In our letter dated November 29I 1983c we committed to upgrade to fully environmentally qualified status the 39 incore thermocouple system by the end of the 1985 refueling outage.
Modifications are being completed and although sufficient incore thermocouples have been upgraded to meet all emergency procedure requirements>
not all thermocouples have been upgraded.
We
- believe, however> that this satisfies the intent of the NRC request and our commitments.
The design of the modification divided the thermocouples into two trains> with 19 in train A and 20 in train B.
Included in the total of 39 thermocouples are three located in the vessel head and 36 at the fuel assembly outlet.
Currentlyi 15 or more thermo-couples in both train A and train B are operable with one operable thermocouple in train A and two operable thermocouples in train B
located in the head.
Of the remaining six thermocouplesI three are broken at the vessel head>
and three are exhibiting noise.
The number of operable thermocouples exceeds those required in the current and the upgraded emergency operating procedures.
The current emergency procedures specify that the value for the five highest reading thermocouples be employed.
The upgraded procedures require that the core exit.thermocouples be used to determine subcooling without specifying a number of thermocouples to be used.
The current set of operable thermocouples permits sufficient flexibility to meet these requirementsr even with the loss of one train or should additional thermocouples become inoperable.
8504O90ia0 860404 t
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PDR ADOCK 05000244,)
P PDR V r truly yoursi R
er W. Kober
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