ML20077C566
| ML20077C566 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/21/1983 |
| From: | Bradley E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.F.2, TASK-TM NUDOCS 8307260165 | |
| Download: ML20077C566 (4) | |
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PHILADELPHIA ELECTRIC CONPANY 23O1 MARKET STREET 1-P.O. BOX 8699 i
PHILADELPHI A. PA.19101
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s (215)8414000 EDW ARD G. B AUER, J R.
voce enssassa?
AND GENEnah COUNSEL C
FUG ENE J. BR ADLEY m.
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DON ALD ELANKEN RUDOLPH A. CHILLEMI E. C. MIR K H A LL T. H. M AH ER CORN ELL PAUL AUERSACH mesesvant esmemak covassL July 21, 1983 EDW ARD J. CULLEN, JR.
THOM AS H. MILLER. JR.
IR EME A. MeKENN A assisvaar counsmL Mr.
A.
Schwencer, Chief Licensing Branch No. 2 Division o f Licensing U.
S.
Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Limerick Generating Station, Units 162 Core Performance Branch Re ference :
PECO and NRC Conference Call dated 7/I/83 File:
GOVT l-1 (NRC)
Dear Mr. Schwencer:
As a result of the discussions in the re ference conference call the additional information as requested by the Core Performance Branch review concerning TMI-2 Action Plan, Item II.F.2, SLI-8211 is enclosed.
Sincerely, l
Eug ne
. Bradley 4
RJS/gra/28 Copy to:
See Attached Service List
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ADDITIONAL INFORMATION CONCERNING ITEM 1, SECTION 4.4.7 TMI-2 ACTION PLAN
r r As stated in our response to RAI421.16, reference leg temperature monitoring is an emergency procedure requirement.
In our original design this was accomplished by monitoring drywell temperature on recorder TR57-110.
This device gave an average drywell temperature at elevation 320'.
In an effort to provide our reactor operators with representative, accurate data and comply with tha recommended improve-ments to be made to our water level measuring system (SLI8211), our present design includes reference leg temperature monitoring.
Reference leg temperature monitoring is accomplished by dual element, type "T", 0.5%, surface mounted thermocouples.
There is one dual element thermocouple installed on each of the five reference legs for each unit at Limerick Generating Station. These thermocouples are mounted approx-imately two (2) feet below each condensing chamber (elevation 314.2'),
with the exception of the upset and shutdown ranges which are mounted below the seal plate to facilitate head removal.
The output of these thermocouples provides inputs to the Emergency Response Facility Data System (ERFDS) necessary to generate displays useful to the reactor operator in determining reference leg temperature and the conditions where reference leg boiling could occur.
Displays and information available on ERFDS include reference leg temperature (both individual temperatures and trend displays), compensated water level, and a reactor pressure vs. reference leg temperature curve useful in determining conditions leading to reference leg boiling.
Regularly scheduled performance and maintenance checks are not done on these thermocouples.
Performance of these temperature elements is checked each time the point (s) is called on the computer. Maintenance actions would be taken whenever a malfunction is detected such as excessively high or low readings or fluctuating temperature i.,dications, etc.
As stated previously, the thermocouples installed are dual element devices, therefore twitching to a spare thermocouple or performing tests on these devices can easily be accomplished from outside containment.
In addition, the existing drywell temperature recorder, TR57-110, can be used as a backup indication of tempersture in the area of the reference legs in the unlikely event of a total temperature monitori. g system failure.
It is our position that we have p.ovided our operating personnel with a reliable, accurate system for mon.toring reference leg temperature to facilitate adherence to the Limerick 3mergency Procedures and thus avoid the potential condition that could lead to reference leg boil-off.